perf(movimento): uma transição, 3D leve e vídeo certo por aparelho

Passagens com fade e 32 px, cena anterior termina em opacidade 0, sem visibility nem clip-path. 3D do hero como fundo ambiente, sob demanda e desligado em toque, aparelho fraco, saveData e movimento reduzido. Lenis fora do toque e salto direto em âncoras distantes. Vitrine só de clientes, até 3 capítulos, fixa só no desktop e carrossel no celular; vídeo só do projeto em cena com preload metadata. Rótulos mono a partir de 12 px e limão só no contato.

app/components/ProjectCover.tsx

@@ -6,7 +6,6 @@ type CoverProject = {
   id: string;
   title: string;
   demoUrl?: string | null;
-  githubUrl?: string | null;
 };
 
 /** Capturas de tela publicadas dos projetos que têm interface pública. */

app/components/ProjectVideo.paths.test.tsx

@@ -0,0 +1,193 @@
+import { render, screen } from "@testing-library/react";
+import { getShowcaseAssets } from "@/lib/project-showcase";
+import { ProjectVideo } from "./ProjectVideo";
+
+/**
+ * Testes de caminhos-base de ProjectVideo (complemento de ProjectVideo.test.tsx): modo só pôster
+ * (movimento reduzido ou "economizar dados") com e sem pôster pedido, inativo x ativo, vídeo sem fontes,
+ * falha do play() e a combinação de ativo com modo só pôster.
+ */
+
+let reducedMotion = false;
+jest.mock("@/app/hooks/useReducedMotion", () => ({
+  useReducedMotion: () => reducedMotion,
+}));
+
+const video = getShowcaseAssets("nutriscan", "desktop");
+
+function setSaveData(value: boolean | undefined) {
+  Object.defineProperty(navigator, "connection", {
+    configurable: true,
+    value: value === undefined ? undefined : { saveData: value },
+  });
+}
+
+beforeEach(() => {
+  reducedMotion = false;
+  setSaveData(undefined);
+  jest.spyOn(HTMLMediaElement.prototype, "play").mockResolvedValue();
+  jest.spyOn(HTMLMediaElement.prototype, "pause").mockImplementation(() => {});
+  jest.spyOn(HTMLMediaElement.prototype, "load").mockImplementation(() => {});
+});
+
+afterEach(() => {
+  jest.restoreAllMocks();
+  setSaveData(undefined);
+});
+
+describe("ProjectVideo: modo só pôster", () => {
+  it.each([
+    [
+      "reduced motion",
+      () => {
+        reducedMotion = true;
+      },
+    ],
+    ["the data saver", () => setSaveData(true)],
+  ])(
+    "path: %s and the poster is not wanted yet -> renders nothing at all",
+    (_l, arrange) => {
+      arrange();
+
+      const { container } = render(
+        <ProjectVideo video={video} title="Demo" active showPoster={false} />,
+      );
+
+      expect(container).toBeEmptyDOMElement();
+    },
+  );
+
+  it.each([
+    [
+      "reduced motion",
+      () => {
+        reducedMotion = true;
+      },
+    ],
+    ["the data saver", () => setSaveData(true)],
+  ])(
+    "path: %s and the poster is wanted -> only the image, with the project name in its alt",
+    (_l, arrange) => {
+      arrange();
+
+      const { container } = render(
+        <ProjectVideo video={video} title="Demo" active={false} />,
+      );
+
+      expect(container.querySelector("video")).toBeNull();
+      const image = screen.getByRole("img", {
+        name: "Captura de tela de Demo",
+      });
+      expect(image).toHaveAttribute("width", String(video.width));
+      expect(image).toHaveAttribute("height", String(video.height));
+    },
+  );
+
+  it("path: data saver off and motion allowed -> the video element, never the image", () => {
+    setSaveData(false);
+
+    const { container } = render(
+      <ProjectVideo video={video} title="Demo" active={false} />,
+    );
+
+    expect(container.querySelector("video")).not.toBeNull();
+    expect(screen.queryByRole("img")).toBeNull();
+  });
+
+  it("path: active card but poster-only mode -> nothing is attached and nothing plays", () => {
+    reducedMotion = true;
+
+    render(<ProjectVideo video={video} title="Demo" active />);
+
+    expect(HTMLMediaElement.prototype.play).not.toHaveBeenCalled();
+    expect(HTMLMediaElement.prototype.load).not.toHaveBeenCalled();
+  });
+});
+
+describe("ProjectVideo: vídeo", () => {
+  it("path: far card (poster not wanted) -> the video has no poster attribute", () => {
+    const { container } = render(
+      <ProjectVideo
+        video={video}
+        title="Demo"
+        active={false}
+        showPoster={false}
+      />,
+    );
+
+    expect(container.querySelector("video")).not.toHaveAttribute("poster");
+  });
+
+  it("path: inactive and never activated -> no source, no load, no play, no pause", () => {
+    render(<ProjectVideo video={video} title="Demo" active={false} />);
+
+    expect(HTMLMediaElement.prototype.load).not.toHaveBeenCalled();
+    expect(HTMLMediaElement.prototype.play).not.toHaveBeenCalled();
+    expect(HTMLMediaElement.prototype.pause).not.toHaveBeenCalled();
+  });
+
+  it("path: becomes active -> muted is forced on the element before play()", () => {
+    const { container, rerender } = render(
+      <ProjectVideo video={video} title="Demo" active={false} />,
+    );
+    const element = container.querySelector("video") as HTMLVideoElement;
+    element.muted = false;
+    let mutedAtPlay: boolean | undefined;
+    jest.mocked(HTMLMediaElement.prototype.play).mockImplementation(function (
+      this: HTMLMediaElement,
+    ) {
+      mutedAtPlay = this.muted;
+      return Promise.resolve();
+    });
+
+    rerender(<ProjectVideo video={video} title="Demo" active />);
+
+    expect(mutedAtPlay).toBe(true);
+  });
+
+  it("path: play() is rejected by the browser -> swallowed, the video stays mounted", async () => {
+    jest
+      .mocked(HTMLMediaElement.prototype.play)
+      .mockRejectedValue(new DOMException("blocked", "NotAllowedError"));
+
+    const { container } = render(
+      <ProjectVideo video={video} title="Demo" active />,
+    );
+    await Promise.resolve();
+
+    expect(container.querySelector("video")).not.toBeNull();
+  });
+
+  it("path: no sources in the assets -> becomes active without calling load()", () => {
+    const empty = { ...video, sources: [] };
+
+    const { container } = render(
+      <ProjectVideo video={empty} title="Demo" active />,
+    );
+
+    expect(container.querySelectorAll("source")).toHaveLength(0);
+    expect(HTMLMediaElement.prototype.load).not.toHaveBeenCalled();
+    expect(HTMLMediaElement.prototype.play).toHaveBeenCalled();
+  });
+
+  it("path: active -> inactive -> active again -> plays again without reloading the sources", () => {
+    const { container, rerender } = render(
+      <ProjectVideo video={video} title="Demo" active />,
+    );
+    const loadsAfterFirst = jest.mocked(HTMLMediaElement.prototype.load).mock
+      .calls.length;
+    const playsAfterFirst = jest.mocked(HTMLMediaElement.prototype.play).mock
+      .calls.length;
+
+    rerender(<ProjectVideo video={video} title="Demo" active={false} />);
+    rerender(<ProjectVideo video={video} title="Demo" active />);
+
+    expect(jest.mocked(HTMLMediaElement.prototype.load).mock.calls.length).toBe(
+      loadsAfterFirst,
+    );
+    expect(jest.mocked(HTMLMediaElement.prototype.play).mock.calls.length).toBe(
+      playsAfterFirst + 1,
+    );
+    expect(container.querySelectorAll("source")).toHaveLength(2);
+  });
+});

app/components/ProjectVideo.test.tsx

@@ -18,6 +18,10 @@ beforeEach(() => {
 
 afterEach(() => {
   jest.restoreAllMocks();
+  Object.defineProperty(navigator, "connection", {
+    configurable: true,
+    value: undefined,
+  });
 });
 
 describe("ProjectVideo", () => {
@@ -31,7 +35,7 @@ describe("ProjectVideo", () => {
     expect(element).toHaveAttribute("autoplay");
     expect(element).toHaveAttribute("loop");
     expect(element).toHaveAttribute("playsinline");
-    expect(element).toHaveAttribute("preload", "none");
+    expect(element).toHaveAttribute("preload", "metadata");
     expect(element).toHaveAttribute("poster", video.poster);
     expect(element?.muted).toBe(true);
     expect(element).toHaveAttribute("data-ready", "false");
@@ -70,6 +74,62 @@ describe("ProjectVideo", () => {
     expect(element).toHaveAttribute("data-ready", "true");
   });
 
+  it("does not even request the poster while the card is far from the screen", () => {
+    const { container, rerender } = render(
+      <ProjectVideo
+        video={video}
+        title="Demo"
+        active={false}
+        showPoster={false}
+      />,
+    );
+    expect(container.querySelector("video")).not.toHaveAttribute("poster");
+
+    rerender(
+      <ProjectVideo video={video} title="Demo" active={false} showPoster />,
+    );
+    expect(container.querySelector("video")).toHaveAttribute(
+      "poster",
+      video.poster,
+    );
+  });
+
+  it("swaps to the sources of the new device when the version changes", () => {
+    const mobile = getShowcaseAssets("nutriscan", "mobile");
+    const { container, rerender } = render(
+      <ProjectVideo video={video} title="Demo" active />,
+    );
+    const loads = jest.mocked(HTMLMediaElement.prototype.load).mock.calls
+      .length;
+
+    rerender(<ProjectVideo video={mobile} title="Demo" active />);
+    expect(
+      [...container.querySelectorAll("source")].map((source) =>
+        source.getAttribute("src"),
+      ),
+    ).toEqual(mobile.sources.map((source) => source.src));
+    expect(
+      jest.mocked(HTMLMediaElement.prototype.load).mock.calls.length,
+    ).toBeGreaterThan(loads);
+  });
+
+  it("shows only the poster, with no video element, when the data saver is on", () => {
+    Object.defineProperty(navigator, "connection", {
+      configurable: true,
+      value: { saveData: true },
+    });
+    const { container } = render(
+      <ProjectVideo video={video} title="Demo" active />,
+    );
+
+    expect(container.querySelector("video")).toBeNull();
+    expect(container.querySelector("source")).toBeNull();
+    expect(
+      screen.getByRole("img", { name: "Captura de tela de Demo" }),
+    ).toBeInTheDocument();
+    expect(HTMLMediaElement.prototype.play).not.toHaveBeenCalled();
+  });
+
   it("shows only the poster, with no video element, when the user prefers reduced motion", () => {
     reducedMotion = true;
     const { container } = render(

app/components/ProjectVideo.tsx

@@ -4,36 +4,44 @@ import Image from "next/image";
 import { useEffect, useRef, useState } from "react";
 import { useReducedMotion } from "@/app/hooks/useReducedMotion";
 import type { ShowcaseAssets } from "@/lib/project-showcase";
+import { useSaveData } from "./showcase/useShowcaseMedia";
 
 /**
- * Vídeo de rolagem na capa do card. Quem decide se ele toca é a vitrine (`active`: só um card por vez, o que
- * está sob o mouse ou o mais perto do centro da tela). Nada do vídeo é baixado antes da primeira vez que o
- * card fica ativo; fora de cena ele pausa. Com prefers-reduced-motion só o poster aparece.
- * O poster também fica por baixo (fundo da tela da moldura): o vídeo aparece em fade quando começa a tocar.
+ * Vídeo de rolagem na capa do card. `video` já é a versão do aparelho (quem chama escolhe: celular abaixo de
+ * 768 px; no servidor, nenhuma). Quem decide se ele toca é a vitrine (`active`: só um card por vez, o que está
+ * sob o mouse ou o mais perto do centro da tela). Nada do vídeo é baixado antes da primeira vez que o card
+ * fica ativo (`preload="metadata"`, sem fontes até lá); fora de cena ele pausa. Com prefers-reduced-motion ou
+ * "economizar dados" só o pôster aparece. `showPoster` falso (seção longe da tela) não pede nem o pôster.
+ * O pôster também fica por baixo (fundo da tela da moldura): o vídeo aparece em fade quando começa a tocar.
  */
 export function ProjectVideo({
   video,
   title,
   active,
+  showPoster = true,
 }: {
   video: ShowcaseAssets;
   title: string;
   active: boolean;
+  showPoster?: boolean;
 }) {
   const reducedMotion = useReducedMotion();
+  const saveData = useSaveData();
   const ref = useRef<HTMLVideoElement>(null);
   const [attached, setAttached] = useState(false);
   const [ready, setReady] = useState(false);
-  const playing = active && !reducedMotion;
+  const posterOnly = reducedMotion || saveData;
+  const playing = active && !posterOnly;
+  const firstSource = video.sources[0]?.src;
 
   useEffect(() => {
     if (playing) setAttached(true);
   }, [playing]);
 
   useEffect(() => {
-    // as fontes entram depois do primeiro render: o elemento precisa ler a lista nova
-    if (attached) ref.current?.load();
-  }, [attached]);
+    // as fontes entram depois do primeiro render (ou mudam com o aparelho): o elemento precisa ler a lista nova
+    if (attached && firstSource) ref.current?.load();
+  }, [attached, firstSource]);
 
   useEffect(() => {
     const element = ref.current;
@@ -46,7 +54,8 @@ export function ProjectVideo({
     }
   }, [attached, playing]);
 
-  if (reducedMotion) {
+  if (posterOnly) {
+    if (!showPoster) return null;
     return (
       <Image
         src={video.poster}
@@ -65,8 +74,8 @@ export function ProjectVideo({
       muted
       loop
       playsInline
-      preload="none"
-      poster={video.poster}
+      preload="metadata"
+      poster={showPoster ? video.poster : undefined}
       width={video.width}
       height={video.height}
       data-ready={ready}

app/components/cinematic/CinematicEffects.test.tsx

@@ -1,4 +1,4 @@
-import { render } from "@testing-library/react";
+import { act, render } from "@testing-library/react";
 import FilmGrain from "./FilmGrain";
 
 describe("static cinematic effects", () => {
@@ -11,3 +11,66 @@ describe("static cinematic effects", () => {
     expect(grain.container.querySelector("canvas")).not.toBeInTheDocument();
   });
 });
+
+describe("film grain over the project screens", () => {
+  let screenTop = 5000;
+
+  function addScreen(className: string) {
+    const element = document.createElement("div");
+    element.className = className;
+    element.getBoundingClientRect = () =>
+      ({ top: screenTop, bottom: screenTop + 600, height: 600 }) as DOMRect;
+    document.body.append(element);
+    return element;
+  }
+
+  function scroll(to: number) {
+    screenTop = to;
+    act(() => {
+      window.dispatchEvent(new Event("scroll"));
+      jest.advanceTimersByTime(40);
+    });
+  }
+
+  beforeEach(() => {
+    jest.useFakeTimers();
+    screenTop = 5000;
+    Object.defineProperty(window, "innerHeight", {
+      configurable: true,
+      value: 800,
+    });
+  });
+
+  afterEach(() => {
+    jest.useRealTimers();
+    document.body.innerHTML = "";
+  });
+
+  it("steps aside while a project screen is in view and comes back when it leaves", () => {
+    addScreen("ds-reel");
+    const { container } = render(<FilmGrain />);
+    const grain = container.firstElementChild as HTMLElement;
+    expect(grain).not.toHaveAttribute("data-over-projects");
+
+    scroll(300); // a vitrine entrou na janela
+    expect(grain).toHaveAttribute("data-over-projects");
+
+    scroll(-900); // passou: a cena acabou 300 px acima do topo
+    expect(grain).not.toHaveAttribute("data-over-projects");
+  });
+
+  it("also covers the browser and phone frames", () => {
+    addScreen("ds-bframe");
+    const { container } = render(<FilmGrain />);
+    scroll(100);
+    expect(container.firstElementChild).toHaveAttribute("data-over-projects");
+  });
+
+  it("stays on when there is no project screen on the page", () => {
+    const { container } = render(<FilmGrain />);
+    scroll(100);
+    expect(container.firstElementChild).not.toHaveAttribute(
+      "data-over-projects",
+    );
+  });
+});

app/components/cinematic/FilmGrain.paths.test.tsx

@@ -0,0 +1,139 @@
+import { act, render } from "@testing-library/react";
+import FilmGrain from "./FilmGrain";
+
+/**
+ * Testes de caminhos-base de FilmGrain (complemento de CinematicEffects.test.tsx): cada condição do retângulo
+ * de uma tela de projeto (altura, fim acima do topo da janela, início abaixo da janela), várias telas, quadros
+ * agrupados e a limpeza ao desmontar.
+ */
+
+const INNER_HEIGHT = 800;
+
+function addScreen(
+  className: string,
+  rect: { top: number; bottom: number; height: number },
+) {
+  const element = document.createElement("div");
+  element.className = className;
+  element.getBoundingClientRect = () => rect as DOMRect;
+  document.body.append(element);
+  return element;
+}
+
+beforeEach(() => {
+  jest.useFakeTimers();
+  Object.defineProperty(window, "innerHeight", {
+    configurable: true,
+    value: INNER_HEIGHT,
+  });
+});
+
+afterEach(() => {
+  jest.useRealTimers();
+  jest.restoreAllMocks();
+  document.body.innerHTML = "";
+});
+
+function renderGrain() {
+  const view = render(<FilmGrain />);
+  return { ...view, grain: view.container.firstElementChild as HTMLElement };
+}
+
+describe("FilmGrain: is a project screen in view?", () => {
+  it("path: a visible screen -> the grain steps aside", () => {
+    addScreen("ds-phone", { top: 100, bottom: 700, height: 600 });
+
+    const { grain } = renderGrain();
+
+    expect(grain).toHaveAttribute("data-over-projects");
+  });
+
+  it.each([
+    ["has no height (hidden by CSS)", { top: 100, bottom: 100, height: 0 }],
+    ["ended exactly at the top edge", { top: -600, bottom: 0, height: 600 }],
+    ["ended above the window", { top: -900, bottom: -300, height: 600 }],
+    [
+      "starts exactly at the bottom edge",
+      { top: INNER_HEIGHT, bottom: 1400, height: 600 },
+    ],
+    ["starts below the window", { top: 2000, bottom: 2600, height: 600 }],
+  ])("path: a screen that %s -> does not count", (_label, rect) => {
+    addScreen("ds-bframe", rect);
+
+    const { grain } = renderGrain();
+
+    expect(grain).not.toHaveAttribute("data-over-projects");
+  });
+
+  it("path: just inside the window by one pixel at either edge -> counts", () => {
+    addScreen("ds-frame", { top: -599, bottom: 1, height: 600 });
+    const top = renderGrain();
+    expect(top.grain).toHaveAttribute("data-over-projects");
+    top.unmount();
+    document.body.innerHTML = "";
+
+    addScreen("ds-frame", { top: INNER_HEIGHT - 1, bottom: 1400, height: 600 });
+    const bottom = renderGrain();
+    expect(bottom.grain).toHaveAttribute("data-over-projects");
+  });
+
+  it("path: one screen off the window and another in view -> counts (any is enough)", () => {
+    addScreen("ds-reel", { top: 5000, bottom: 5600, height: 600 });
+    addScreen("ds-phone", { top: 100, bottom: 700, height: 600 });
+
+    const { grain } = renderGrain();
+
+    expect(grain).toHaveAttribute("data-over-projects");
+  });
+
+  it("path: no project screen on the page -> the grain stays", () => {
+    const { grain } = renderGrain();
+
+    expect(grain).not.toHaveAttribute("data-over-projects");
+  });
+});
+
+describe("FilmGrain: frames and cleanup", () => {
+  it("path: many scroll events inside one frame -> the page is measured once", () => {
+    const screenEl = addScreen("ds-reel", {
+      top: 5000,
+      bottom: 5600,
+      height: 600,
+    });
+    const measure = jest.spyOn(screenEl, "getBoundingClientRect");
+    renderGrain();
+    measure.mockClear();
+
+    act(() => {
+      window.dispatchEvent(new Event("scroll"));
+      window.dispatchEvent(new Event("scroll"));
+      window.dispatchEvent(new Event("resize"));
+      jest.advanceTimersByTime(40);
+    });
+
+    expect(measure).toHaveBeenCalledTimes(1);
+  });
+
+  it("path: unmount -> listeners removed and no measurement afterwards", () => {
+    const screenEl = addScreen("ds-reel", {
+      top: 5000,
+      bottom: 5600,
+      height: 600,
+    });
+    const measure = jest.spyOn(screenEl, "getBoundingClientRect");
+    const { unmount } = renderGrain();
+    act(() => {
+      window.dispatchEvent(new Event("scroll"));
+    });
+
+    unmount();
+    measure.mockClear();
+    act(() => {
+      window.dispatchEvent(new Event("scroll"));
+      window.dispatchEvent(new Event("resize"));
+      jest.advanceTimersByTime(100);
+    });
+
+    expect(measure).not.toHaveBeenCalled();
+  });
+});

app/components/cinematic/FilmGrain.tsx

@@ -1,3 +1,43 @@
+"use client";
+
+import { useEffect, useRef } from "react";
+
+/** Telas dos projetos (vitrine e capas): nenhum efeito pode ficar por cima delas. */
+const PROJECT_SCREENS = ".ds-reel, .ds-frame, .ds-bframe, .ds-phone";
+
+/** Grão de filme sobre a página. Some enquanto qualquer tela de projeto está à vista (data-over-projects). */
 export default function FilmGrain() {
-  return <div aria-hidden="true" className="film-grain" />;
+  const ref = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    const grain = ref.current;
+    if (!grain) return;
+    let frame = 0;
+    const update = () => {
+      frame = 0;
+      const over = Array.from(document.querySelectorAll(PROJECT_SCREENS)).some(
+        (screen) => {
+          const rect = screen.getBoundingClientRect();
+          return (
+            rect.height > 0 && rect.bottom > 0 && rect.top < window.innerHeight
+          );
+        },
+      );
+      if (over) grain.dataset.overProjects = "";
+      else delete grain.dataset.overProjects;
+    };
+    const queue = () => {
+      if (!frame) frame = requestAnimationFrame(update);
+    };
+    update();
+    window.addEventListener("scroll", queue, { passive: true });
+    window.addEventListener("resize", queue);
+    return () => {
+      cancelAnimationFrame(frame);
+      window.removeEventListener("scroll", queue);
+      window.removeEventListener("resize", queue);
+    };
+  }, []);
+
+  return <div ref={ref} aria-hidden="true" className="film-grain" />;
 }

app/components/cinematic/FramePulse.test.tsx

@@ -0,0 +1,50 @@
+import { act, render } from "@testing-library/react";
+import FramePulse from "./FramePulse";
+
+const mockInvalidate = jest.fn();
+
+jest.mock("@react-three/fiber", () => ({
+  useThree: (select: (state: { invalidate: () => void }) => unknown) =>
+    select({ invalidate: mockInvalidate }),
+}));
+
+beforeEach(() => {
+  jest.useFakeTimers();
+  mockInvalidate.mockClear();
+});
+
+afterEach(() => {
+  jest.useRealTimers();
+});
+
+describe("FramePulse", () => {
+  it("asks for frames at about 30 per second while active, not 60", () => {
+    render(<FramePulse active />);
+    act(() => {
+      jest.advanceTimersByTime(1000);
+    });
+    expect(mockInvalidate.mock.calls.length).toBeGreaterThan(20);
+    expect(mockInvalidate.mock.calls.length).toBeLessThanOrEqual(34);
+  });
+
+  it("draws nothing at all when it is not active (off screen)", () => {
+    const { rerender } = render(<FramePulse active={false} />);
+    act(() => {
+      jest.advanceTimersByTime(1000);
+    });
+    expect(mockInvalidate).not.toHaveBeenCalled();
+
+    rerender(<FramePulse active />);
+    act(() => {
+      jest.advanceTimersByTime(200);
+    });
+    const running = mockInvalidate.mock.calls.length;
+    expect(running).toBeGreaterThan(0);
+
+    rerender(<FramePulse active={false} />);
+    act(() => {
+      jest.advanceTimersByTime(1000);
+    });
+    expect(mockInvalidate.mock.calls.length).toBe(running);
+  });
+});

app/components/cinematic/FramePulse.tsx

@@ -0,0 +1,36 @@
+"use client";
+
+import { useThree } from "@react-three/fiber";
+import { useEffect } from "react";
+
+/**
+ * Batida das cenas WebGL em `frameloop="demand"`: enquanto `active`, pede um quadro a no máximo `fps` por
+ * segundo (fundo ambiente, sem gastar 60 quadros por segundo); com `active` falso, nenhum quadro é desenhado.
+ * Quem precisa de mais (entrada, rolagem, cursor) pede o próximo quadro com `invalidate()` dentro do useFrame.
+ */
+export default function FramePulse({
+  active,
+  fps = 30,
+}: {
+  active: boolean;
+  fps?: number;
+}) {
+  const invalidate = useThree((state) => state.invalidate);
+
+  useEffect(() => {
+    if (!active) return;
+    const gap = 1000 / fps - 2;
+    let id = 0;
+    let last = 0;
+    const beat = (now: number) => {
+      id = requestAnimationFrame(beat);
+      if (now - last < gap) return;
+      last = now;
+      invalidate();
+    };
+    id = requestAnimationFrame(beat);
+    return () => cancelAnimationFrame(id);
+  }, [active, fps, invalidate]);
+
+  return null;
+}

app/components/cinematic/HeroBackground.paths.test.tsx

@@ -0,0 +1,67 @@
+import { render } from "@testing-library/react";
+import { renderToString } from "react-dom/server";
+import { isLowPowerDevice } from "@/lib/device";
+import HeroBackground from "./HeroBackground";
+
+/**
+ * Testes de caminhos-base de HeroBackground: movimento reduzido (nada), aparelho fraco (só as camadas escuras,
+ * sem baixar a cena 3D), aparelho capaz (cena montada depois do efeito) e o HTML do servidor (sem cena).
+ */
+
+let reducedMotion = false;
+jest.mock("@/app/hooks/useReducedMotion", () => ({
+  useReducedMotion: () => reducedMotion,
+}));
+jest.mock("@/lib/device", () => ({ isLowPowerDevice: jest.fn() }));
+jest.mock("next/dynamic", () => ({
+  __esModule: true,
+  default: () =>
+    function MockScene() {
+      return require("react").createElement("canvas", {
+        "data-testid": "hero-scene",
+      });
+    },
+}));
+
+const lowPower = jest.mocked(isLowPowerDevice);
+
+beforeEach(() => {
+  reducedMotion = false;
+  lowPower.mockReset();
+  lowPower.mockReturnValue(false);
+});
+
+describe("HeroBackground", () => {
+  it("path: reduced motion -> renders nothing, even on a capable device", () => {
+    reducedMotion = true;
+
+    const { container } = render(<HeroBackground />);
+
+    expect(container).toBeEmptyDOMElement();
+  });
+
+  it("path: capable device -> the 3D scene plus the three dark layers", () => {
+    const { container, getByTestId } = render(<HeroBackground />);
+
+    expect(getByTestId("hero-scene")).toBeInTheDocument();
+    expect(container.querySelectorAll(".pointer-events-none")).toHaveLength(3);
+  });
+
+  it("path: low-power device -> only the dark layers, the 3D scene is never mounted", () => {
+    lowPower.mockReturnValue(true);
+
+    const { container, queryByTestId } = render(<HeroBackground />);
+
+    expect(queryByTestId("hero-scene")).toBeNull();
+    expect(container.querySelectorAll(".pointer-events-none")).toHaveLength(3);
+    expect(lowPower).toHaveBeenCalledTimes(1);
+  });
+
+  it("path: server HTML -> layers without the scene (capability is only known in the browser)", () => {
+    const html = renderToString(<HeroBackground />);
+
+    expect(html).not.toContain("canvas");
+    expect(html).toContain("pointer-events-none");
+    expect(lowPower).not.toHaveBeenCalled();
+  });
+});

app/components/cinematic/HeroBackground.tsx

@@ -1,23 +1,32 @@
 "use client";
 
 import dynamic from "next/dynamic";
+import { useEffect, useState } from "react";
 import { useReducedMotion } from "@/app/hooks/useReducedMotion";
+import { isLowPowerDevice } from "@/lib/device";
 
 const HeroScene = dynamic(() => import("./HeroScene"), { ssr: false });
 
 /**
  * Reusable 3D animated background for internal hero sections.
  * Drop this inside any `relative overflow-hidden` dark section.
+ * A cena WebGL só monta em aparelho que aguenta (sem toque, sem pouca CPU/memória, sem "economizar dados"):
+ * nos outros fica o fundo escuro, sem baixar o Three.js.
  */
 export default function HeroBackground() {
   const shouldReduceMotion = useReducedMotion();
+  const [capable, setCapable] = useState(false);
+
+  useEffect(() => {
+    setCapable(!isLowPowerDevice());
+  }, []);
 
   if (shouldReduceMotion) return null;
 
   return (
     <>
       {/* 3D particle scene */}
-      <HeroScene />
+      {capable && <HeroScene />}
 
       {/* Cinematic radial vignette */}
       <div className="pointer-events-none absolute inset-0 z-[1] bg-[radial-gradient(ellipse_80%_60%_at_50%_40%,transparent_0%,rgba(10,10,10,0.5)_55%,var(--ink)_100%)]" />

app/components/cinematic/HeroField.paths.test.tsx

@@ -0,0 +1,405 @@
+import { act, render, screen } from "@testing-library/react";
+import HeroField from "./HeroField";
+
+/**
+ * Testes de caminhos-base de HeroField (complemento de HeroField.test.tsx): a decisão de montar o WebGL
+ * (requestIdleCallback x temporizador, desmontagem antes da hora, falhas ao pedir o contexto WebGL2),
+ * o fundo sem a seção `.hero`, as variáveis de rolagem e a visibilidade (observador, aba oculta, fim do mergulho).
+ */
+
+type SceneProps = {
+  visible: boolean;
+  progressRef: { current: number };
+  onReady: () => void;
+  onError: () => void;
+};
+const mockScenes: SceneProps[] = [];
+
+jest.mock("next/dynamic", () => ({
+  __esModule: true,
+  default: () =>
+    function MockScene(props: SceneProps) {
+      mockScenes.push(props);
+      return require("react").createElement("canvas", {
+        "data-testid": "scene",
+      });
+    },
+}));
+
+const win = window as unknown as Record<string, unknown>;
+const original = {
+  matchMedia: window.matchMedia,
+  webgl2: win.WebGL2RenderingContext,
+  getContext: HTMLCanvasElement.prototype.getContext,
+  observer: global.IntersectionObserver,
+  idle: win.requestIdleCallback,
+  cancelIdle: win.cancelIdleCallback,
+};
+
+function mockMedia(active: string[]) {
+  window.matchMedia = jest.fn().mockImplementation((query: string) => ({
+    matches: active.includes(query),
+    media: query,
+    addEventListener() {},
+    removeEventListener() {},
+  }));
+}
+
+function mockNavigator(values: Record<string, unknown>) {
+  for (const [key, value] of Object.entries(values))
+    Object.defineProperty(navigator, key, { configurable: true, value });
+}
+
+function setContext(factory: () => unknown) {
+  HTMLCanvasElement.prototype.getContext = factory as never;
+}
+
+type Observer = {
+  callback: IntersectionObserverCallback;
+  disconnect: jest.Mock;
+};
+let observers: Observer[] = [];
+
+function Hero({ children }: { children?: React.ReactNode }) {
+  return (
+    <section className="hero">
+      <HeroField />
+      {children}
+    </section>
+  );
+}
+
+function setHidden(value: boolean) {
+  Object.defineProperty(document, "hidden", { configurable: true, value });
+}
+
+function reportIntersecting(value: boolean) {
+  act(() => {
+    for (const observer of observers)
+      observer.callback(
+        [{ isIntersecting: value } as IntersectionObserverEntry],
+        {} as IntersectionObserver,
+      );
+  });
+}
+
+beforeEach(() => {
+  jest.useFakeTimers();
+  mockScenes.length = 0;
+  observers = [];
+  mockMedia([]);
+  mockNavigator({
+    hardwareConcurrency: 8,
+    deviceMemory: undefined,
+    connection: undefined,
+  });
+  win.WebGL2RenderingContext = function WebGL2RenderingContext() {};
+  setContext(() => ({ getExtension: () => null }));
+  win.requestIdleCallback = undefined;
+  win.cancelIdleCallback = undefined;
+  global.IntersectionObserver = class {
+    private readonly record: Observer;
+    constructor(callback: IntersectionObserverCallback) {
+      this.record = { callback, disconnect: jest.fn() };
+      observers.push(this.record);
+    }
+    observe() {}
+    unobserve() {}
+    disconnect() {
+      this.record.disconnect();
+    }
+    takeRecords() {
+      return [];
+    }
+  } as unknown as typeof IntersectionObserver;
+});
+
+afterEach(() => {
+  jest.useRealTimers();
+  jest.restoreAllMocks();
+  window.matchMedia = original.matchMedia;
+  win.WebGL2RenderingContext = original.webgl2;
+  win.requestIdleCallback = original.idle;
+  win.cancelIdleCallback = original.cancelIdle;
+  HTMLCanvasElement.prototype.getContext = original.getContext;
+  global.IntersectionObserver = original.observer;
+  Reflect.deleteProperty(document, "hidden");
+});
+
+describe("HeroField: quando o WebGL monta", () => {
+  it("path: no requestIdleCallback -> the scene mounts after 1.2 s of timer, not before", () => {
+    render(<Hero />);
+
+    act(() => {
+      jest.advanceTimersByTime(1199);
+    });
+    expect(screen.queryByTestId("scene")).toBeNull();
+
+    act(() => {
+      jest.advanceTimersByTime(1);
+    });
+    expect(screen.getByTestId("scene")).toBeInTheDocument();
+  });
+
+  it("path: requestIdleCallback available -> mounts when the browser is idle (2.5 s timeout), not on the timer", () => {
+    let idle: (() => void) | undefined;
+    const request = jest.fn((callback: () => void) => {
+      idle = callback;
+      return 42;
+    });
+    win.requestIdleCallback = request;
+    win.cancelIdleCallback = jest.fn();
+
+    render(<Hero />);
+    act(() => {
+      jest.advanceTimersByTime(5000);
+    });
+    expect(screen.queryByTestId("scene")).toBeNull();
+    expect(request).toHaveBeenCalledWith(expect.any(Function), {
+      timeout: 2500,
+    });
+
+    act(() => idle?.());
+    expect(screen.getByTestId("scene")).toBeInTheDocument();
+  });
+
+  it("path: unmounted before the browser got idle -> the idle request is cancelled and no scene mounts", () => {
+    const cancel = jest.fn();
+    win.requestIdleCallback = jest.fn(() => 7);
+    win.cancelIdleCallback = cancel;
+
+    const view = render(<Hero />);
+    view.unmount();
+
+    expect(cancel).toHaveBeenCalledWith(7);
+    expect(mockScenes).toHaveLength(0);
+  });
+
+  it("path: unmounted before the fallback timer fires -> nothing mounts afterwards", () => {
+    const view = render(<Hero />);
+    view.unmount();
+
+    act(() => {
+      jest.advanceTimersByTime(5000);
+    });
+
+    expect(mockScenes).toHaveLength(0);
+  });
+
+  it("path: WebGL2 constructor exists but creating the context throws -> static background", () => {
+    setContext(() => {
+      throw new Error("sem GPU");
+    });
+
+    render(<Hero />);
+    act(() => {
+      jest.advanceTimersByTime(3000);
+    });
+
+    expect(screen.queryByTestId("scene")).toBeNull();
+  });
+
+  it("path: WebGL2 constructor exists but the context is null -> static background", () => {
+    setContext(() => null);
+
+    render(<Hero />);
+    act(() => {
+      jest.advanceTimersByTime(3000);
+    });
+
+    expect(screen.queryByTestId("scene")).toBeNull();
+  });
+
+  it("path: the probe context is released right away (WEBGL_lose_context) before the real scene mounts", () => {
+    const loseContext = jest.fn();
+    setContext(() => ({
+      getExtension: (name: string) =>
+        name === "WEBGL_lose_context" ? { loseContext } : null,
+    }));
+
+    render(<Hero />);
+    act(() => {
+      jest.advanceTimersByTime(3000);
+    });
+
+    expect(loseContext).toHaveBeenCalledTimes(1);
+    expect(screen.getByTestId("scene")).toBeInTheDocument();
+  });
+
+  it("path: the lose-context extension is missing -> the probe still succeeds", () => {
+    setContext(() => ({ getExtension: () => null }));
+
+    render(<Hero />);
+    act(() => {
+      jest.advanceTimersByTime(3000);
+    });
+
+    expect(screen.getByTestId("scene")).toBeInTheDocument();
+  });
+
+  it("path: low power -> the WebGL probe and the timer are never started", () => {
+    mockMedia(["(pointer: coarse)"]);
+    const probe = jest.fn(() => ({ getExtension: () => null }));
+    setContext(probe);
+
+    render(<Hero />);
+    act(() => {
+      jest.advanceTimersByTime(3000);
+    });
+
+    expect(probe).not.toHaveBeenCalled();
+    expect(mockScenes).toHaveLength(0);
+  });
+});
+
+describe("HeroField: rolagem e visibilidade", () => {
+  function section() {
+    return document.querySelector(".hero") as HTMLElement;
+  }
+
+  function place(top: number, height = 2000) {
+    section().getBoundingClientRect = () =>
+      ({ top, height, bottom: top + height }) as DOMRect;
+  }
+
+  function scroll(top: number) {
+    place(top);
+    act(() => {
+      window.dispatchEvent(new Event("scroll"));
+      jest.advanceTimersByTime(40);
+    });
+  }
+
+  beforeEach(() => {
+    Object.defineProperty(window, "innerHeight", {
+      configurable: true,
+      value: 800,
+    });
+  });
+
+  it("path: no .hero ancestor -> no scroll variables and no observer, but the scene still mounts (not visible)", () => {
+    render(<HeroField />);
+    act(() => {
+      jest.advanceTimersByTime(3000);
+    });
+
+    expect(observers).toHaveLength(0);
+    expect(screen.getByTestId("scene")).toBeInTheDocument();
+    expect(mockScenes.at(-1)?.visible).toBe(false);
+  });
+
+  it("path: scrolling to the same progress twice -> the CSS variables are written once", () => {
+    render(<Hero />);
+    const setProperty = jest.spyOn(section().style, "setProperty");
+
+    scroll(-600);
+    const afterFirst = setProperty.mock.calls.length;
+    expect(afterFirst).toBeGreaterThan(0);
+    scroll(-600);
+
+    expect(setProperty.mock.calls).toHaveLength(afterFirst);
+  });
+
+  it("path: resize recomputes the progress like a scroll", () => {
+    render(<Hero />);
+    place(-600);
+
+    act(() => {
+      window.dispatchEvent(new Event("resize"));
+      jest.advanceTimersByTime(40);
+    });
+
+    expect(Number(section().style.getPropertyValue("--hero-p"))).toBeCloseTo(
+      0.5,
+    );
+  });
+
+  it("path: scroll above the hero (positive top) -> progress clamps at 0", () => {
+    render(<Hero />);
+
+    scroll(300);
+
+    expect(Number(section().style.getPropertyValue("--hero-p") || 0)).toBe(0);
+  });
+
+  it("path: end of the dive then back up -> drawing stops, then resumes", () => {
+    render(<Hero />);
+    act(() => {
+      jest.advanceTimersByTime(3000);
+    });
+    reportIntersecting(true);
+
+    scroll(-1200);
+    expect(mockScenes.at(-1)?.visible).toBe(false);
+
+    scroll(-300);
+    expect(mockScenes.at(-1)?.visible).toBe(true);
+  });
+
+  it("path: the hero leaves the screen -> not visible; returns -> visible", () => {
+    render(<Hero />);
+    act(() => {
+      jest.advanceTimersByTime(3000);
+    });
+
+    reportIntersecting(true);
+    expect(mockScenes.at(-1)?.visible).toBe(true);
+
+    reportIntersecting(false);
+    expect(mockScenes.at(-1)?.visible).toBe(false);
+
+    reportIntersecting(true);
+    expect(mockScenes.at(-1)?.visible).toBe(true);
+  });
+
+  it("path: the tab is hidden while the hero is on screen -> not visible; shown again -> visible", () => {
+    render(<Hero />);
+    act(() => {
+      jest.advanceTimersByTime(3000);
+    });
+    reportIntersecting(true);
+
+    setHidden(true);
+    act(() => {
+      document.dispatchEvent(new Event("visibilitychange"));
+    });
+    expect(mockScenes.at(-1)?.visible).toBe(false);
+
+    setHidden(false);
+    act(() => {
+      document.dispatchEvent(new Event("visibilitychange"));
+    });
+    expect(mockScenes.at(-1)?.visible).toBe(true);
+  });
+
+  it("path: the tab shows but the hero is off screen -> still not visible", () => {
+    render(<Hero />);
+    act(() => {
+      jest.advanceTimersByTime(3000);
+    });
+    reportIntersecting(false);
+
+    act(() => {
+      document.dispatchEvent(new Event("visibilitychange"));
+    });
+
+    expect(mockScenes.at(-1)?.visible).toBe(false);
+  });
+
+  it("path: unmount -> listeners removed, observer disconnected, pending frame cancelled", () => {
+    const removeListener = jest.spyOn(window, "removeEventListener");
+    const removeDocListener = jest.spyOn(document, "removeEventListener");
+    const cancelFrame = jest.spyOn(window, "cancelAnimationFrame");
+    const view = render(<Hero />);
+
+    view.unmount();
+
+    const removed = removeListener.mock.calls.map(([type]) => type);
+    expect(removed).toEqual(expect.arrayContaining(["scroll", "resize"]));
+    expect(removeDocListener.mock.calls.map(([type]) => type)).toContain(
+      "visibilitychange",
+    );
+    expect(observers[0].disconnect).toHaveBeenCalledTimes(1);
+    expect(cancelFrame).toHaveBeenCalled();
+  });
+});

app/components/cinematic/HeroField.test.tsx

@@ -0,0 +1,179 @@
+import { act, render, screen } from "@testing-library/react";
+import HeroField from "./HeroField";
+
+type SceneProps = {
+  visible: boolean;
+  progressRef: { current: number };
+  labelsRef?: unknown;
+  onReady: () => void;
+  onError: () => void;
+};
+const mockScenes: SceneProps[] = [];
+
+jest.mock("next/dynamic", () => ({
+  __esModule: true,
+  default: () =>
+    function MockScene(props: SceneProps) {
+      mockScenes.push(props);
+      return require("react").createElement("canvas", {
+        "data-testid": "scene",
+      });
+    },
+}));
+
+const original = {
+  matchMedia: window.matchMedia,
+  webgl2: (window as unknown as Record<string, unknown>).WebGL2RenderingContext,
+  getContext: HTMLCanvasElement.prototype.getContext,
+};
+
+function mockMedia(active: string[]) {
+  window.matchMedia = jest.fn().mockImplementation((query: string) => ({
+    matches: active.includes(query),
+    media: query,
+    addEventListener() {},
+    removeEventListener() {},
+  }));
+}
+
+function mockNavigator(values: Record<string, unknown>) {
+  for (const [key, value] of Object.entries(values))
+    Object.defineProperty(navigator, key, { configurable: true, value });
+}
+
+function Hero() {
+  return (
+    <section className="hero">
+      <HeroField />
+    </section>
+  );
+}
+
+/** O navegador ocioso: o Three.js só entra depois do tempo de espera. */
+function idle() {
+  act(() => {
+    jest.advanceTimersByTime(3000);
+  });
+}
+
+beforeEach(() => {
+  jest.useFakeTimers();
+  mockScenes.length = 0;
+  mockMedia([]);
+  mockNavigator({
+    hardwareConcurrency: 8,
+    deviceMemory: undefined,
+    connection: undefined,
+  });
+  (window as unknown as Record<string, unknown>).WebGL2RenderingContext =
+    function WebGL2RenderingContext() {};
+  HTMLCanvasElement.prototype.getContext = (() => ({
+    getExtension: () => null,
+  })) as unknown as typeof HTMLCanvasElement.prototype.getContext;
+});
+
+afterEach(() => {
+  jest.useRealTimers();
+  window.matchMedia = original.matchMedia;
+  (window as unknown as Record<string, unknown>).WebGL2RenderingContext =
+    original.webgl2;
+  HTMLCanvasElement.prototype.getContext = original.getContext;
+});
+
+describe("HeroField (ambient background)", () => {
+  it("mounts the WebGL scene only after the page is idle, on a capable desktop", () => {
+    render(<Hero />);
+    expect(screen.queryByTestId("scene")).toBeNull();
+    idle();
+    expect(screen.getByTestId("scene")).toBeInTheDocument();
+    // o IntersectionObserver do jest.setup avisa que o hero está à vista: o desenho está liberado
+    expect(mockScenes.at(-1)?.visible).toBe(true);
+  });
+
+  it("is decorative: hidden from assistive technology and with no labels over the 3D", () => {
+    const { container } = render(<Hero />);
+    idle();
+    const field = container.querySelector(".hero-field");
+    expect(field).toHaveAttribute("aria-hidden", "true");
+    expect(container.querySelector(".hero-tag")).toBeNull();
+    for (const label of ["A tela", "As integrações", "Os dados"])
+      expect(screen.queryByText(label, { exact: false })).toBeNull();
+    expect(mockScenes.at(-1)?.labelsRef).toBeUndefined();
+  });
+
+  it.each([
+    ["a touch pointer", () => mockMedia(["(pointer: coarse)"])],
+    ["reduced motion", () => mockMedia(["(prefers-reduced-motion: reduce)"])],
+    ["the data saver", () => mockNavigator({ connection: { saveData: true } })],
+    ["four cores", () => mockNavigator({ hardwareConcurrency: 4 })],
+    ["4 GB of memory", () => mockNavigator({ deviceMemory: 4 })],
+    [
+      "no WebGL2",
+      () => {
+        (window as unknown as Record<string, unknown>).WebGL2RenderingContext =
+          undefined;
+      },
+    ],
+  ])(
+    "keeps the light static background (no WebGL) with %s",
+    (_label, arrange) => {
+      arrange();
+      const { container } = render(<Hero />);
+      idle();
+      expect(screen.queryByTestId("scene")).toBeNull();
+      expect(mockScenes).toHaveLength(0);
+      expect(container.querySelector(".hero-field")).not.toHaveAttribute(
+        "data-ready",
+      );
+    },
+  );
+
+  it("follows the hero scroll with --hero-p and --hero-open, and stops drawing once the dive is over", () => {
+    const { container } = render(<Hero />);
+    idle();
+    const section = container.querySelector(".hero") as HTMLElement;
+    let top = 0;
+    section.getBoundingClientRect = () =>
+      ({ top, height: 2000, bottom: top + 2000 }) as DOMRect;
+    Object.defineProperty(window, "innerHeight", {
+      configurable: true,
+      value: 800,
+    });
+    const scroll = (to: number) => {
+      top = -to;
+      act(() => {
+        window.dispatchEvent(new Event("scroll"));
+        jest.advanceTimersByTime(40);
+      });
+    };
+
+    scroll(0);
+    expect(mockScenes.at(-1)?.progressRef.current).toBe(0);
+
+    scroll(600); // meio do mergulho (1200 px de trilho)
+    expect(Number(section.style.getPropertyValue("--hero-p"))).toBeCloseTo(0.5);
+    // a máscara já se abriu por completo: o fundo aparece inteiro
+    expect(Number(section.style.getPropertyValue("--hero-open"))).toBe(1);
+
+    scroll(1200);
+    expect(Number(section.style.getPropertyValue("--hero-p"))).toBe(1);
+    expect(mockScenes.at(-1)?.visible).toBe(false);
+  });
+
+  it("reveals the scene (data-ready) once it has drawn its first frames", () => {
+    const { container } = render(<Hero />);
+    idle();
+    expect(container.querySelector(".hero-field")).not.toHaveAttribute(
+      "data-ready",
+    );
+    act(() => mockScenes.at(-1)?.onReady());
+    expect(container.querySelector(".hero-field")).toHaveAttribute(
+      "data-ready",
+    );
+    act(() => mockScenes.at(-1)?.onError());
+    expect(container.querySelector(".hero-field")).not.toHaveAttribute(
+      "data-ready",
+    );
+    expect(screen.queryByTestId("scene")).toBeNull();
+  });
+});

app/components/cinematic/HeroField.tsx

@@ -2,19 +2,18 @@
 
 import dynamic from "next/dynamic";
 import { useCallback, useEffect, useRef, useState } from "react";
+import { isLowPowerDevice } from "@/lib/device";
 import type { HeroFieldSceneProps } from "./HeroFieldScene";
 
-/** Etiquetas presas às camadas da cena (a cena calcula a posição de cada uma a cada quadro). */
-const TAGS = [
-  ["A tela", "o que sua equipe e seus clientes usam"],
-  ["As integrações", "seus sistemas conversando entre si"],
-  ["Os dados", "suas informações organizadas"],
-] as const;
-
 const Scene = dynamic<HeroFieldSceneProps>(() => import("./HeroFieldScene"), {
   ssr: false,
 });
 
+const smooth = (a: number, b: number, x: number) => {
+  const t = Math.min(1, Math.max(0, (x - a) / (b - a)));
+  return t * t * (3 - 2 * t);
+};
+
 function supportsWebGL2() {
   if (typeof window.WebGL2RenderingContext === "undefined") return false;
   try {
@@ -27,13 +26,15 @@ function supportsWebGL2() {
 }
 
 /**
- * Fundo do hero: liga a rolagem do hero à variável CSS --hero-p (0 no topo, 1 no fim do mergulho)
- * e monta a cena WebGL só quando a página fica ociosa, com WebGL2 e sem preferência por movimento reduzido.
+ * Fundo ambiente do hero. Liga a rolagem do hero às variáveis CSS --hero-p (0 no topo, 1 no fim do mergulho)
+ * e --hero-open (0 em repouso, 1 quando a máscara do globals.css já se abriu para o mergulho), e monta a cena
+ * WebGL só quando a página fica ociosa e o aparelho aguenta: WebGL2, sem toque (pointer: coarse), com mais de
+ * 4 núcleos e mais de 4 GB, sem "economizar dados" e sem movimento reduzido. Nos outros casos fica o fundo
+ * estático leve do CSS (.hero-glow). Sem legendas sobre o 3D: o espaço da direita é das molduras.
  */
 export default function HeroField() {
   const rootRef = useRef<HTMLDivElement>(null);
   const progressRef = useRef(0);
-  const labelsRef = useRef<(HTMLElement | null)[]>([]);
   const [mount, setMount] = useState(false);
   const [visible, setVisible] = useState(false);
   const [ready, setReady] = useState(false);
@@ -53,8 +54,12 @@ export default function HeroField() {
         window.innerHeight * 0.8,
       );
       const p = Math.min(1, Math.max(0, -rect.top / span));
+      // depois do mergulho (ou antes dele) a rolagem não muda mais nada: sem reescrever as variáveis CSS
+      if (p === progressRef.current) return;
       progressRef.current = p;
       section.style.setProperty("--hero-p", p.toFixed(4));
+      // a máscara só se abre quando o texto e a coluna da direita já quase saíram (o conteúdo some até p ≈ 0,24)
+      section.style.setProperty("--hero-open", smooth(0.16, 0.3, p).toFixed(4));
       setDone(p >= 0.999);
     };
     const queue = () => {
@@ -82,7 +87,7 @@ export default function HeroField() {
   }, []);
 
   useEffect(() => {
-    if (window.matchMedia("(prefers-reduced-motion: reduce)").matches) return;
+    if (isLowPowerDevice()) return;
     if (!supportsWebGL2()) return;
     // Título, botões e hidratação vêm primeiro; o Three.js entra quando o navegador fica ocioso.
     if (typeof window.requestIdleCallback === "function") {
@@ -108,26 +113,11 @@ export default function HeroField() {
       {mount && !failed && (
         <Scene
           progressRef={progressRef}
-          labelsRef={labelsRef}
           visible={visible && !done}
           onReady={handleReady}
           onError={handleError}
         />
       )}
-      {mount &&
-        !failed &&
-        TAGS.map(([title, text], index) => (
-          <span
-            key={title}
-            ref={(element) => {
-              labelsRef.current[index] = element;
-            }}
-            className="hero-tag"
-          >
-            <span className="hero-tag-title">{title}</span>
-            {text}
-          </span>
-        ))}
     </div>
   );
 }

app/components/cinematic/HeroFieldScene.paths.test.tsx

@@ -0,0 +1,580 @@
+import { act, render } from "@testing-library/react";
+import * as THREE from "three";
+import HeroFieldScene from "./HeroFieldScene";
+
+/**
+ * Testes de caminhos-base do quadro da cena 3D (o callback do useFrame de Field, CC alta) e de SceneBoundary:
+ * - fim antecipado sem grupo, onReady no 2º quadro, amortecimento da rolagem (limite de dt, progresso ausente);
+ * - retrato x paisagem (posição do grupo e distância da câmera) e o foco da lente;
+ * - mouse ativo x parado x toque, raio que acerta ou não o plano, e a quantidade de pontos (denso x leve);
+ * - quando pedir o próximo quadro (entrada, rolagem assentando, cursor) e quando não pedir;
+ * - perda do contexto WebGL, limpeza e a falha de um filho (SceneBoundary).
+ * O @react-three/fiber é trocado por um dublê que renderiza os filhos e entrega o callback do useFrame; o `three`
+ * é o de verdade, com ShaderMaterial e BufferGeometry registrando as instâncias criadas.
+ */
+
+type FrameState = {
+  clock: { elapsedTime: number };
+  invalidate: () => void;
+};
+const mockState: {
+  frame: ((state: FrameState, delta: number) => void) | null;
+  three: unknown;
+  throwOnUseThree: boolean;
+} = { frame: null, three: null, throwOnUseThree: false };
+const mockMaterials: THREE.ShaderMaterial[] = [];
+const mockGeometries: THREE.BufferGeometry[] = [];
+
+jest.mock("three", () => {
+  const actual = jest.requireActual("three");
+  class CapturingMaterial extends actual.ShaderMaterial {
+    constructor(parameters: unknown) {
+      super(parameters);
+      mockMaterials.push(this as unknown as THREE.ShaderMaterial);
+    }
+  }
+  class CapturingGeometry extends actual.BufferGeometry {
+    constructor() {
+      super();
+      mockGeometries.push(this as unknown as THREE.BufferGeometry);
+    }
+  }
+  return {
+    ...actual,
+    ShaderMaterial: CapturingMaterial,
+    BufferGeometry: CapturingGeometry,
+  };
+});
+jest.mock("@react-three/fiber", () => ({
+  Canvas: ({ children }: { children?: React.ReactNode }) => <>{children}</>,
+  useFrame: (callback: (state: FrameState, delta: number) => void) => {
+    mockState.frame = callback;
+  },
+  useThree: () => {
+    if (mockState.throwOnUseThree) throw new Error("sem WebGL");
+    return mockState.three;
+  },
+}));
+jest.mock("./FramePulse", () => ({ __esModule: true, default: () => null }));
+
+type Setup = {
+  width?: number;
+  height?: number;
+  /** `null` simula uma ref sem valor (o código trata como 0). */
+  progress?: number | null;
+  visible?: boolean;
+};
+
+function setup({
+  width = 1200,
+  height = 800,
+  progress = 0,
+  visible = true,
+}: Setup = {}) {
+  const domElement = document.createElement("canvas");
+  const camera = new THREE.PerspectiveCamera(35, width / height, 0.05, 120);
+  camera.position.set(0, 0, 9);
+  camera.updateMatrixWorld();
+  mockState.three = {
+    gl: { domElement, getPixelRatio: () => 2 },
+    camera,
+    size: { width, height },
+  };
+  const progressRef = {
+    current: progress === null ? undefined : progress,
+  } as { current: number };
+  const onReady = jest.fn();
+  const onError = jest.fn();
+  const element = (isVisible: boolean) => (
+    <HeroFieldScene
+      progressRef={progressRef}
+      visible={isVisible}
+      onReady={onReady}
+      onError={onError}
+    />
+  );
+  const view = render(element(visible));
+
+  // <group> é um elemento desconhecido no jsdom: ganha o que o três espera de um THREE.Group
+  const group = view.container.querySelector("group") as HTMLElement | null;
+  const real = new THREE.Group();
+  if (group)
+    Object.assign(group, {
+      rotation: real.rotation,
+      position: real.position,
+      matrixWorld: real.matrixWorld,
+      updateMatrixWorld: () => real.updateMatrixWorld(true),
+      worldToLocal: (point: THREE.Vector3) => point,
+    });
+  const uniforms = () => mockMaterials[mockMaterials.length - 1].uniforms;
+
+  function frame(time: number, delta = 1 / 60) {
+    const invalidate = jest.fn();
+    act(() => {
+      mockState.frame?.({ clock: { elapsedTime: time }, invalidate }, delta);
+    });
+    return invalidate;
+  }
+
+  /** Roda `count` quadros e devolve quantas vezes o próximo quadro foi pedido no último. */
+  function settle(count: number, delta = 1 / 20, startTime = 100) {
+    let last = jest.fn();
+    for (let i = 0; i < count; i++) last = frame(startTime + i * delta, delta);
+    return last;
+  }
+
+  return {
+    ...view,
+    camera,
+    domElement,
+    progressRef,
+    onReady,
+    onError,
+    group: real,
+    uniforms,
+    frame,
+    settle,
+    rerender: (isVisible: boolean) => view.rerender(element(isVisible)),
+  };
+}
+
+const originalHardware = Object.getOwnPropertyDescriptor(
+  navigator,
+  "hardwareConcurrency",
+);
+
+function setCores(value: number | undefined) {
+  Object.defineProperty(navigator, "hardwareConcurrency", {
+    configurable: true,
+    value,
+  });
+}
+
+function setWindowWidth(value: number) {
+  Object.defineProperty(window, "innerWidth", {
+    configurable: true,
+    value,
+  });
+}
+
+function pointerMove(type: string, x = 600, y = 400) {
+  const event = new MouseEvent("pointermove", { clientX: x, clientY: y });
+  Object.defineProperty(event, "pointerType", { value: type });
+  act(() => {
+    window.dispatchEvent(event);
+  });
+}
+
+beforeEach(() => {
+  mockMaterials.length = 0;
+  mockGeometries.length = 0;
+  mockState.frame = null;
+  mockState.throwOnUseThree = false;
+  setCores(8);
+  setWindowWidth(1200);
+  // as tags do R3F (group, points) são elementos desconhecidos no DOM do jsdom
+  jest.spyOn(console, "error").mockImplementation(() => {});
+});
+
+afterEach(() => {
+  jest.restoreAllMocks();
+  if (originalHardware)
+    Object.defineProperty(navigator, "hardwareConcurrency", originalHardware);
+});
+
+describe("Field: quadro (useFrame) — começo e rolagem", () => {
+  it("path: the group is gone (unmounted) -> the callback returns at once, nothing is requested", () => {
+    const scene = setup();
+    const callback = mockState.frame;
+    scene.unmount();
+    const invalidate = jest.fn();
+
+    callback?.({ clock: { elapsedTime: 1 }, invalidate }, 1 / 60);
+
+    expect(invalidate).not.toHaveBeenCalled();
+    expect(scene.onReady).not.toHaveBeenCalled();
+  });
+
+  it("path: onReady fires on the second frame, once", () => {
+    const scene = setup();
+
+    scene.frame(0);
+    expect(scene.onReady).not.toHaveBeenCalled();
+    scene.frame(0.02);
+    expect(scene.onReady).toHaveBeenCalledTimes(1);
+    scene.frame(0.04);
+    scene.frame(0.06);
+
+    expect(scene.onReady).toHaveBeenCalledTimes(1);
+  });
+
+  it("path: the scroll progress is damped toward the target (and a long frame cannot overshoot)", () => {
+    const scene = setup({ progress: 1 });
+
+    scene.frame(0, 5); // delta enorme: o passo é limitado a 1/20 de segundo
+
+    const expected = 1 - Math.exp(-(1 / 20) * 5);
+    expect(scene.uniforms().uScroll.value).toBeCloseTo(expected, 9);
+    expect(scene.uniforms().uScroll.value).toBeLessThan(1);
+  });
+
+  it("path: no progress available (undefined) -> treated as the top of the page", () => {
+    const scene = setup({ progress: null });
+
+    scene.settle(5);
+
+    expect(scene.uniforms().uScroll.value).toBe(0);
+  });
+
+  it("path: the intro advances every frame and stops at 1", () => {
+    const scene = setup();
+
+    scene.frame(0, 1 / 20);
+    expect(scene.uniforms().uIntro.value).toBeCloseTo(0.05 / 2.6, 9);
+
+    scene.settle(80);
+
+    expect(scene.uniforms().uIntro.value).toBe(1);
+  });
+
+  it("path: the scene fades out only at the very end of the dive", () => {
+    const scene = setup({ progress: 0 });
+    scene.settle(10);
+    expect(scene.uniforms().uFade.value).toBe(1);
+
+    scene.progressRef.current = 1;
+    scene.settle(120);
+
+    expect(scene.uniforms().uFade.value).toBeCloseTo(0, 6);
+  });
+
+  it("path: layers spread apart only while they face the viewer", () => {
+    const scene = setup({ progress: 0 });
+    scene.settle(5);
+    expect(scene.uniforms().uSpread.value).toBeCloseTo(1.05, 6);
+
+    scene.progressRef.current = 0.5;
+    scene.settle(150);
+
+    expect(scene.uniforms().uSpread.value).toBeGreaterThan(5);
+  });
+});
+
+describe("Field: enquadramento e foco", () => {
+  it("path: landscape window -> the group sits just below center and the camera rests at 9", () => {
+    const scene = setup({ width: 1200, height: 800 });
+
+    scene.frame(0);
+
+    expect(scene.group.position.y).toBeCloseTo(-0.5, 9);
+    expect(scene.camera.position.z).toBeCloseTo(9, 9);
+  });
+
+  it("path: portrait window -> the group sits lower and the camera backs off to keep the layer in frame", () => {
+    const scene = setup({ width: 400, height: 800 });
+
+    scene.frame(0);
+
+    expect(scene.group.position.y).toBeLessThan(-0.5);
+    expect(scene.camera.position.z).toBeGreaterThan(9);
+  });
+
+  it("path: end of the dive -> the group has settled back to the center and the camera went through the layers", () => {
+    const scene = setup({ progress: 1 });
+
+    scene.settle(200);
+
+    expect(scene.group.position.y).toBeCloseTo(0, 6);
+    expect(scene.camera.position.z).toBeLessThan(0);
+  });
+
+  it("path: camera in front of the layers -> the lens focuses on the next layer ahead", () => {
+    const scene = setup({ progress: 0 });
+
+    scene.frame(0);
+
+    // câmera em 9 e primeira camada em 1,05: foco a 9 - 1,05
+    expect(scene.uniforms().uFocus.value).toBeCloseTo(9 - 1.05, 6);
+  });
+
+  it("path: camera past every layer -> the focus never goes below 1.5", () => {
+    const scene = setup({ progress: 1 });
+
+    scene.settle(200);
+
+    expect(scene.uniforms().uFocus.value).toBe(1.5);
+  });
+});
+
+describe("Field: mouse", () => {
+  it("path: pointer type other than mouse (touch, pen) -> ignored, the cursor stays on its own path", () => {
+    const scene = setup();
+    jest.spyOn(performance, "now").mockReturnValue(5000);
+    pointerMove("touch");
+    pointerMove("pen");
+
+    scene.frame(5.5);
+
+    // sem mouse, o cursor fantasma passa a valer 0,4 (não 0,8)
+    scene.settle(120, 1 / 20, 5.5);
+    expect(scene.uniforms().uMouseAmt.value).toBeCloseTo(0.4, 2);
+  });
+
+  it("path: a mouse moved a moment ago -> the pointer drives the cursor strength to 0.8", () => {
+    const scene = setup();
+    jest.spyOn(performance, "now").mockReturnValue(5000);
+    pointerMove("mouse");
+
+    for (let i = 0; i < 120; i++) scene.frame(5.1 + i * 0.01, 1 / 20);
+
+    expect(scene.uniforms().uMouseAmt.value).toBeCloseTo(0.8, 2);
+  });
+
+  it("path: the mouse stopped long ago (over 2.5 s) -> back to the ghost cursor", () => {
+    const scene = setup();
+    jest.spyOn(performance, "now").mockReturnValue(5000);
+    pointerMove("mouse");
+
+    for (let i = 0; i < 120; i++) scene.frame(9 + i * 0.01, 1 / 20);
+
+    expect(scene.uniforms().uMouseAmt.value).toBeCloseTo(0.4, 2);
+  });
+
+  it("path: a mouse event at timestamp 0 is not counted as activity", () => {
+    const scene = setup();
+    jest.spyOn(performance, "now").mockReturnValue(0);
+    pointerMove("mouse");
+
+    for (let i = 0; i < 120; i++) scene.frame(0.1 + i * 0.001, 1 / 20);
+
+    expect(scene.uniforms().uMouseAmt.value).toBeCloseTo(0.4, 2);
+  });
+
+  it("path: cursor strength fades to 0 once the dive is under way", () => {
+    const scene = setup({ progress: 1 });
+    jest.spyOn(performance, "now").mockReturnValue(5000);
+    pointerMove("mouse");
+
+    for (let i = 0; i < 200; i++) scene.frame(5.1 + i * 0.005, 1 / 20);
+
+    expect(scene.uniforms().uMouseAmt.value).toBeCloseTo(0, 2);
+  });
+
+  it("path: active mouse and the ray hits the layer plane -> the shader cursor follows the hit point", () => {
+    const scene = setup();
+    jest
+      .spyOn(THREE.Ray.prototype, "intersectPlane")
+      .mockImplementation(((_plane: THREE.Plane, target: THREE.Vector3) =>
+        target.set(1, 0, 2)) as never);
+    jest.spyOn(performance, "now").mockReturnValue(5000);
+    pointerMove("mouse");
+
+    scene.frame(5.1, 1 / 20);
+
+    const factor = 1 - Math.exp(-(1 / 20) * 10);
+    expect(scene.uniforms().uMouse.value.x).toBeCloseTo(factor * 1, 6);
+    expect(scene.uniforms().uMouse.value.y).toBeCloseTo(factor * 2, 6);
+  });
+
+  it("path: active mouse but the ray misses the plane -> the shader cursor stays where it was", () => {
+    const scene = setup();
+    jest
+      .spyOn(THREE.Ray.prototype, "intersectPlane")
+      .mockReturnValue(null as never);
+    jest.spyOn(performance, "now").mockReturnValue(5000);
+    pointerMove("mouse");
+
+    scene.frame(5.1, 1 / 20);
+
+    expect(scene.uniforms().uMouse.value.x).toBe(0);
+    expect(scene.uniforms().uMouse.value.y).toBe(0);
+  });
+
+  it("path: idle mouse -> the ghost cursor wanders on its own", () => {
+    const scene = setup();
+
+    scene.frame(10, 1 / 20);
+
+    const { x, y } = scene.uniforms().uMouse.value;
+    expect(Math.hypot(x, y)).toBeGreaterThan(0);
+  });
+});
+
+describe("Field: quando pedir o próximo quadro", () => {
+  it("path: the intro is still running -> a frame is requested even when the hero is not visible", () => {
+    const scene = setup({ visible: false });
+
+    const invalidate = scene.frame(0, 1 / 60);
+
+    expect(invalidate).toHaveBeenCalled();
+  });
+
+  it("path: everything settled and the hero is visible but nothing interacts -> no extra frame (the pulse does it)", () => {
+    const scene = setup({ visible: true });
+    scene.settle(200);
+
+    const invalidate = scene.frame(500, 1 / 60);
+
+    expect(invalidate).not.toHaveBeenCalled();
+  });
+
+  it("path: everything settled and the hero is not visible -> no frame", () => {
+    const scene = setup({ visible: false });
+    scene.settle(200);
+
+    const invalidate = scene.frame(500, 1 / 60);
+
+    expect(invalidate).not.toHaveBeenCalled();
+  });
+
+  it("path: settled, visible, and the mouse is moving -> frames are requested", () => {
+    const scene = setup({ visible: true });
+    scene.settle(200);
+    jest.spyOn(performance, "now").mockReturnValue(600_000);
+    pointerMove("mouse");
+
+    const invalidate = scene.frame(600.1, 1 / 60);
+
+    expect(invalidate).toHaveBeenCalled();
+  });
+
+  it("path: settled, mouse active, but the hero is not visible -> no frame (cursor only counts on screen)", () => {
+    const scene = setup({ visible: false });
+    scene.settle(200);
+    jest.spyOn(performance, "now").mockReturnValue(600_000);
+    pointerMove("mouse");
+
+    const invalidate = scene.frame(600.1, 1 / 60);
+
+    expect(invalidate).not.toHaveBeenCalled();
+  });
+
+  it("path: the scroll target moved after the hero left the screen -> still finishes settling", () => {
+    const scene = setup({ visible: false });
+    scene.settle(200);
+    scene.progressRef.current = 0.5;
+
+    const invalidate = scene.frame(500, 1 / 60);
+
+    expect(invalidate).toHaveBeenCalled();
+  });
+
+  it("path: becoming visible later -> the new callback sees the new flag", () => {
+    const scene = setup({ visible: false });
+    scene.settle(200);
+    jest.spyOn(performance, "now").mockReturnValue(600_000);
+    pointerMove("mouse");
+    expect(scene.frame(600.1, 1 / 60)).not.toHaveBeenCalled();
+
+    scene.rerender(true);
+
+    expect(scene.frame(600.2, 1 / 60)).toHaveBeenCalled();
+  });
+});
+
+describe("Field: densidade, contexto WebGL e limpeza", () => {
+  const pointCount = () => {
+    const geometry = mockGeometries[mockGeometries.length - 1];
+    return geometry.getAttribute("position").count;
+  };
+
+  it("path: wide window and 4+ cores -> the dense field", () => {
+    setWindowWidth(1200);
+    setCores(8);
+    setup();
+    const dense = pointCount();
+
+    mockGeometries.length = 0;
+    setWindowWidth(600);
+    setup();
+
+    expect(dense).toBeGreaterThan(pointCount());
+  });
+
+  it("path: wide window but 2 cores -> the light field", () => {
+    setWindowWidth(1200);
+    setCores(2);
+    setup();
+    const light = pointCount();
+
+    mockGeometries.length = 0;
+    setCores(8);
+    setup();
+
+    expect(pointCount()).toBeGreaterThan(light);
+  });
+
+  it("path: the browser does not report cores -> counts as capable (4): dense, not light", () => {
+    setWindowWidth(1200);
+    const counts: Record<string, number> = {};
+    for (const [label, cores] of [
+      ["dense", 8],
+      ["light", 2],
+      ["unknown", undefined],
+    ] as const) {
+      mockGeometries.length = 0;
+      setCores(cores);
+      setup();
+      counts[label] = pointCount();
+    }
+
+    expect(Math.abs(counts.unknown - counts.dense)).toBeLessThan(
+      Math.abs(counts.unknown - counts.light),
+    );
+  });
+
+  it("path: the WebGL context is lost -> the default recovery is cancelled and the page is told", () => {
+    const scene = setup();
+    const event = new Event("webglcontextlost", { cancelable: true });
+
+    act(() => {
+      scene.domElement.dispatchEvent(event);
+    });
+
+    expect(event.defaultPrevented).toBe(true);
+    expect(scene.onError).toHaveBeenCalledTimes(1);
+  });
+
+  it("path: unmount -> geometry and material are disposed and the listeners go away", () => {
+    const scene = setup();
+    const geometry = mockGeometries[mockGeometries.length - 1];
+    const material = mockMaterials[mockMaterials.length - 1];
+    const disposeGeometry = jest.spyOn(geometry, "dispose");
+    const disposeMaterial = jest.spyOn(material, "dispose");
+    const event = new Event("webglcontextlost", { cancelable: true });
+
+    scene.unmount();
+    scene.domElement.dispatchEvent(event);
+
+    expect(disposeGeometry).toHaveBeenCalledTimes(1);
+    expect(disposeMaterial).toHaveBeenCalledTimes(1);
+    expect(event.defaultPrevented).toBe(false);
+    expect(scene.onError).not.toHaveBeenCalled();
+  });
+});
+
+describe("SceneBoundary", () => {
+  it("path: a child fails while drawing -> nothing is rendered and the page is told once", () => {
+    mockState.throwOnUseThree = true;
+    const onError = jest.fn();
+
+    const { container } = render(
+      <HeroFieldScene
+        progressRef={{ current: 0 }}
+        visible
+        onReady={() => {}}
+        onError={onError}
+      />,
+    );
+
+    expect(container).toBeEmptyDOMElement();
+    expect(onError).toHaveBeenCalledTimes(1);
+  });
+
+  it("path: no failure -> the scene is rendered and onError is not called", () => {
+    const scene = setup();
+
+    expect(scene.container.querySelector("group")).not.toBeNull();
+    expect(scene.onError).not.toHaveBeenCalled();
+  });
+});

app/components/cinematic/HeroFieldScene.test.tsx

@@ -0,0 +1,51 @@
+import { render } from "@testing-library/react";
+import HeroFieldScene from "./HeroFieldScene";
+
+type CanvasProps = {
+  dpr?: [number, number];
+  frameloop?: string;
+  gl?: Record<string, unknown>;
+};
+const mockCanvas: CanvasProps[] = [];
+
+jest.mock("@react-three/fiber", () => ({
+  Canvas: (props: CanvasProps) => {
+    mockCanvas.push(props);
+    return null;
+  },
+  useFrame: jest.fn(),
+  useThree: jest.fn(),
+}));
+
+describe("HeroFieldScene (ambient 3D)", () => {
+  beforeEach(() => {
+    mockCanvas.length = 0;
+  });
+
+  it("draws on demand, never on a fixed 60 fps loop, and caps the pixel ratio at 1.5", () => {
+    render(
+      <HeroFieldScene
+        progressRef={{ current: 0 }}
+        visible
+        onReady={() => {}}
+        onError={() => {}}
+      />,
+    );
+    const props = mockCanvas.at(-1);
+    expect(props?.frameloop).toBe("demand");
+    expect(props?.dpr).toEqual([1, 1.5]);
+    expect(props?.gl).toMatchObject({ alpha: true, antialias: false });
+  });
+
+  it("keeps the same on-demand loop when the hero is off screen (the pulse is what stops)", () => {
+    render(
+      <HeroFieldScene
+        progressRef={{ current: 0 }}
+        visible={false}
+        onReady={() => {}}
+        onError={() => {}}
+      />,
+    );
+    expect(mockCanvas.at(-1)?.frameloop).toBe("demand");
+  });
+});

app/components/cinematic/HeroFieldScene.tsx

@@ -10,11 +10,10 @@ import {
   useRef,
 } from "react";
 import * as THREE from "three";
+import FramePulse from "./FramePulse";
 
 export type HeroFieldSceneProps = {
   progressRef: RefObject<number>;
-  /** etiquetas em HTML presas às camadas (tela, integrações, dados), posicionadas a cada quadro */
-  labelsRef: RefObject<(HTMLElement | null)[]>;
   visible: boolean;
   onReady: () => void;
   onError: () => void;
@@ -26,8 +25,12 @@ export type HeroFieldSceneProps = {
  * ligados a uma central, com mensagens correndo pelas linhas); embaixo, os DADOS (uma tabela).
  * Colunas de partículas sobem da tabela até a tela: a informação chegando a quem usa.
  * Na entrada, os pontos saem de uma nuvem e se organizam; ao rolar, as camadas se afastam, ficam de
- * frente e a câmera atravessa uma a uma (as legendas de HeroField explicam cada camada nessa hora).
+ * frente e a câmera atravessa uma a uma (as legendas de Hero explicam cada camada nessa hora).
  * Tudo se move no vertex shader; o JavaScript só atualiza alguns uniforms por quadro.
+ *
+ * É um fundo ambiente: HeroField o deixa com pouca opacidade e uma máscara que o afasta do título e das
+ * molduras da direita. O desenho é sob demanda (frameloop "demand"): a cena pede um quadro a 30 por segundo
+ * e a 60 só enquanto algo muda (entrada, rolagem, cursor); sem estar à vista, não desenha nada.
  */
 
 type Layer = 1 | 0 | -1; // 1 = tela, 0 = integrações, -1 = dados
@@ -389,16 +392,9 @@ function cameraFrames(rest: number, spread: number, frame: number) {
   ] as const;
 }
 
-// ponto de cada camada onde a etiqueta se prende (canto direito da frente), na ordem tela, integrações, dados
-const LABEL_ANCHORS: [number, Layer, number][] = [
-  [2.1, 1, 1.4],
-  [1.95, 0, 0.9],
-  [2, -1, 1.3],
-];
-
 function Field({
   progressRef,
-  labelsRef,
+  visible,
   onReady,
   onError,
 }: HeroFieldSceneProps) {
@@ -444,7 +440,6 @@ function Field({
       ray: new THREE.Raycaster(),
       plane: new THREE.Plane(),
       hit: new THREE.Vector3(),
-      anchor: new THREE.Vector3(),
       zero: new THREE.Vector2(),
       target: new THREE.Vector2(),
     }),
@@ -521,12 +516,9 @@ function Field({
       0,
     );
     const settle = 1 - smooth(0, 0.28, p);
-    // em repouso: à direita do texto na tela larga; no celular, mais abaixo, atrás dos botões
-    g.position.set(
-      wide ? 1.7 * settle : 0,
-      (wide ? -0.1 : -rest * tanHalf * 0.38) * settle,
-      0,
-    );
+    // em repouso: ao centro e um pouco abaixo (a máscara de HeroField afasta o desenho do título e das molduras
+    // da direita); no celular, mais abaixo, atrás dos botões
+    g.position.set(0, (wide ? -0.5 : -rest * tanHalf * 0.38) * settle, 0);
     camera.position.z = keyframes(cameraFrames(rest, spreadMax, frameDist), p);
     // foco na próxima camada à frente da câmera (as de trás desfocam como em uma lente)
     const spread = u.uSpread.value;
@@ -561,23 +553,19 @@ function Field({
     u.uMouseAmt.value +=
       (targetAmt - u.uMouseAmt.value) * (1 - Math.exp(-dt * 4));
 
-    // etiquetas: projeta o canto de cada camada na tela e as esconde quando o mergulho começa
-    const labels = labelsRef.current ?? [];
-    const shown = smooth(0.75, 1, u.uIntro.value) * (1 - smooth(0.04, 0.16, p));
-    LABEL_ANCHORS.forEach(([x, layer, z], index) => {
-      const label = labels[index];
-      if (!label) return;
-      helpers.anchor
-        .set(x, layer * u.uSpread.value, z)
-        .applyMatrix4(g.matrixWorld)
-        .project(camera);
-      const px = ((helpers.anchor.x + 1) / 2) * size.width;
-      const py = ((1 - helpers.anchor.y) / 2) * size.height;
-      label.style.transform = `translate3d(${px.toFixed(1)}px, ${py.toFixed(1)}px, 0)`;
-      label.style.opacity = shown.toFixed(3);
-    });
-
     if (++s.frames === 2) onReady();
+
+    // sob demanda: o próximo quadro vem do FramePulse (30 por segundo); a 60 só enquanto algo ainda muda.
+    // A entrada e a rolagem terminam de assentar mesmo depois de o hero sair de cena (o último quadro tem de
+    // ser o final, com tudo já apagado); o cursor só conta com o hero à vista.
+    const settling =
+      u.uIntro.value < 1 ||
+      Math.abs((progressRef.current ?? 0) - s.progress) > 4e-4;
+    const interacting =
+      mouseActive === 1 ||
+      Math.abs(targetAmt - u.uMouseAmt.value) > 0.01 ||
+      s.frames < 3;
+    if (settling || (visible && interacting)) frame.invalidate();
   });
 
   return (
@@ -610,14 +598,15 @@ export default function HeroFieldScene(props: HeroFieldSceneProps) {
         aria-hidden="true"
         style={{ width: "100%", height: "100%" }}
         camera={{ fov: 35, position: [0, 0, 9], near: 0.05, far: 120 }}
-        dpr={[1, 1.75]}
-        frameloop={props.visible ? "always" : "never"}
+        dpr={[1, 1.5]}
+        frameloop="demand"
         gl={{
           alpha: true,
           antialias: false,
           powerPreference: "high-performance",
         }}
       >
+        <FramePulse active={props.visible} />
         <Field {...props} />
       </Canvas>
     </SceneBoundary>

app/components/cinematic/HeroScene.paths.test.tsx

@@ -0,0 +1,206 @@
+import { act, render } from "@testing-library/react";
+import HeroScene from "./HeroScene";
+
+/**
+ * Testes de caminhos-base de HeroScene (fundo 3D das páginas internas): quando o desenho está ligado
+ * (visível E à vista), a câmera que segue o mouse (CameraRig) e o relógio do chão em grade (GridFloor).
+ * O @react-three/fiber é trocado por um dublê que renderiza os filhos e entrega os callbacks do useFrame.
+ */
+
+const mockFrames: Array<(state: unknown, delta: number) => void> = [];
+const mockCamera = {
+  position: { x: 0, y: 0.5, z: 8 },
+  lookAt: jest.fn(),
+};
+const mockPulse = jest.fn();
+
+jest.mock("@react-three/fiber", () => ({
+  Canvas: ({ children }: { children?: React.ReactNode }) => <>{children}</>,
+  useFrame: (callback: (state: unknown, delta: number) => void) => {
+    mockFrames.push(callback);
+  },
+  useThree: () => ({ camera: mockCamera }),
+}));
+jest.mock("./FramePulse", () => ({
+  __esModule: true,
+  default: (props: { active: boolean }) => {
+    mockPulse(props.active);
+    return null;
+  },
+}));
+
+type Observer = {
+  callback: IntersectionObserverCallback;
+  disconnect: jest.Mock;
+};
+let observers: Observer[] = [];
+const OriginalObserver = global.IntersectionObserver;
+
+beforeEach(() => {
+  mockFrames.length = 0;
+  mockPulse.mockClear();
+  mockCamera.position = { x: 0, y: 0.5, z: 8 };
+  mockCamera.lookAt.mockClear();
+  observers = [];
+  global.IntersectionObserver = class {
+    private readonly record: Observer;
+    constructor(callback: IntersectionObserverCallback) {
+      this.record = { callback, disconnect: jest.fn() };
+      observers.push(this.record);
+    }
+    observe() {}
+    unobserve() {}
+    disconnect() {
+      this.record.disconnect();
+    }
+    takeRecords() {
+      return [];
+    }
+  } as unknown as typeof IntersectionObserver;
+  // as tags do R3F (fog, mesh, ...) são elementos desconhecidos no DOM do jsdom
+  jest.spyOn(console, "error").mockImplementation(() => {});
+});
+
+afterEach(() => {
+  global.IntersectionObserver = OriginalObserver;
+  jest.restoreAllMocks();
+});
+
+const lastPulse = () =>
+  mockPulse.mock.calls[mockPulse.mock.calls.length - 1][0];
+
+function report(isIntersecting: boolean) {
+  act(() => {
+    observers[0].callback(
+      [{ isIntersecting } as IntersectionObserverEntry],
+      {} as IntersectionObserver,
+    );
+  });
+}
+
+describe("HeroScene: quando desenha", () => {
+  it("path: visible by prop and in view (default) -> the pulse is on", () => {
+    render(<HeroScene />);
+
+    expect(lastPulse()).toBe(true);
+  });
+
+  it("path: isVisible=false -> the pulse is off even though the scene is in view", () => {
+    render(<HeroScene isVisible={false} />);
+
+    expect(lastPulse()).toBe(false);
+  });
+
+  it("path: scrolled out of view -> off; back in view -> on", () => {
+    render(<HeroScene />);
+
+    report(false);
+    expect(lastPulse()).toBe(false);
+
+    report(true);
+    expect(lastPulse()).toBe(true);
+  });
+
+  it("path: out of view and isVisible=false -> off", () => {
+    render(<HeroScene isVisible={false} />);
+
+    report(false);
+
+    expect(lastPulse()).toBe(false);
+  });
+
+  it("path: unmount -> the observer is disconnected", () => {
+    const view = render(<HeroScene />);
+
+    view.unmount();
+
+    expect(observers[0].disconnect).toHaveBeenCalledTimes(1);
+  });
+});
+
+describe("HeroScene: câmera que segue o mouse", () => {
+  // a cada renderização CameraRig e GridFloor chamam useFrame, nessa ordem: valem os dois últimos
+  const rigFrame = () => mockFrames[mockFrames.length - 2];
+
+  it("path: mouse at the center -> the camera eases toward the resting height and looks at the origin", () => {
+    render(<HeroScene />);
+
+    act(() => {
+      rigFrame()({}, 0.016);
+    });
+
+    expect(mockCamera.position.x).toBeCloseTo(0, 9);
+    expect(mockCamera.position.y).toBeCloseTo(0.5, 9);
+    expect(mockCamera.lookAt).toHaveBeenCalledWith(0, 0, 0);
+  });
+
+  it("path: mouse moved to the top-right corner -> the camera drifts right and up, a little per frame", () => {
+    Object.defineProperty(window, "innerWidth", {
+      configurable: true,
+      value: 1000,
+    });
+    Object.defineProperty(window, "innerHeight", {
+      configurable: true,
+      value: 800,
+    });
+    render(<HeroScene />);
+
+    act(() => {
+      window.dispatchEvent(
+        new MouseEvent("mousemove", { clientX: 1000, clientY: 0 }),
+      );
+      rigFrame()({}, 0.016);
+    });
+
+    // alvo x = 1 * 0.5; alvo y = 1 * 0.3 + 0.5; passo de 2% por quadro
+    expect(mockCamera.position.x).toBeCloseTo(0.5 * 0.02, 9);
+    expect(mockCamera.position.y).toBeCloseTo(0.5 + (0.8 - 0.5) * 0.02, 9);
+  });
+
+  it("path: unmount -> the mouse listener is removed", () => {
+    const remove = jest.spyOn(window, "removeEventListener");
+    const view = render(<HeroScene />);
+
+    view.unmount();
+
+    expect(remove.mock.calls.map(([type]) => type)).toContain("mousemove");
+  });
+});
+
+describe("HeroScene: relógio do chão em grade", () => {
+  const gridFrame = () => mockFrames[mockFrames.length - 1];
+
+  function attachMaterial(material: unknown) {
+    const mesh = document.querySelector("mesh") as HTMLElement & {
+      material?: unknown;
+    };
+    mesh.material = material;
+  }
+
+  it("path: the mesh has shader uniforms -> uTime follows the clock", () => {
+    render(<HeroScene />);
+    const uniforms = { uTime: { value: 0 } };
+    attachMaterial({ uniforms });
+
+    gridFrame()({ clock: { elapsedTime: 12.5 } }, 0.016);
+
+    expect(uniforms.uTime.value).toBe(12.5);
+  });
+
+  it("path: the material has no uniforms yet -> nothing happens", () => {
+    render(<HeroScene />);
+    attachMaterial({});
+
+    expect(() =>
+      gridFrame()({ clock: { elapsedTime: 3 } }, 0.016),
+    ).not.toThrow();
+  });
+
+  it("path: the mesh is gone (unmounted) -> the frame callback does nothing", () => {
+    const view = render(<HeroScene />);
+    const frame = gridFrame();
+    view.unmount();
+
+    expect(() => frame({ clock: { elapsedTime: 3 } }, 0.016)).not.toThrow();
+  });
+});

app/components/cinematic/HeroScene.tsx

@@ -1,8 +1,9 @@
 "use client";
 
 import { Canvas, useFrame, useThree } from "@react-three/fiber";
-import { useEffect, useMemo, useRef } from "react";
+import { useEffect, useMemo, useRef, useState } from "react";
 import * as THREE from "three";
+import FramePulse from "./FramePulse";
 
 function GridFloor() {
   const meshRef = useRef<THREE.Mesh>(null);
@@ -95,20 +96,36 @@ function CameraRig() {
   return null;
 }
 
+/** Fundo ambiente das páginas internas: desenha sob demanda, a 30 quadros por segundo e só à vista. */
 export default function HeroScene({
   isVisible = true,
 }: {
   isVisible?: boolean;
 }) {
+  const rootRef = useRef<HTMLDivElement>(null);
+  const [inView, setInView] = useState(true);
+
+  // fora da tela não desenha nada
+  useEffect(() => {
+    const element = rootRef.current;
+    if (!element) return;
+    const observer = new IntersectionObserver(([entry]) =>
+      setInView(entry.isIntersecting),
+    );
+    observer.observe(element);
+    return () => observer.disconnect();
+  }, []);
+
   return (
     <div
+      ref={rootRef}
       className="absolute inset-0 z-0"
       style={{ position: "absolute", top: 0, left: 0, right: 0, bottom: 0 }}
     >
       <Canvas
         camera={{ position: [0, 0.5, 8], fov: 60, near: 0.1, far: 100 }}
         dpr={[1, 1.5]}
-        frameloop={isVisible ? "always" : "never"}
+        frameloop="demand"
         gl={{
           antialias: false,
           alpha: true,
@@ -133,6 +150,7 @@ export default function HeroScene({
         />
         <pointLight position={[-5, 3, -5]} intensity={0.2} color="#ffffff" />
 
+        <FramePulse active={isVisible && inView} />
         <CameraRig />
         <GridFloor />
       </Canvas>

app/components/cinematic/useCinematicScroll.paths.test.tsx

@@ -0,0 +1,720 @@
+import { act, render } from "@testing-library/react";
+import { ScrollTrigger } from "gsap/ScrollTrigger";
+import { useRef } from "react";
+import { IDLE_SECONDS, useCinematicScroll } from "./useCinematicScroll";
+
+/**
+ * Testes de caminhos-base de useCinematicScroll (complemento de useCinematicScroll.test.tsx):
+ * - onClick (âncoras): cada guarda que devolve o clique ao navegador, alvo dentro de uma cena x a própria cena
+ *   x fora de qualquer cena, desconto do cabeçalho, pushState só quando a âncora muda, foco no alvo;
+ * - salto direto (acima de 3 telas) x rolagem de até 0,8 s, nos limites exatos;
+ * - criação do Lenis (opções, ligação com o ScrollTrigger), relógio que dorme e acorda, desmontagem antes das
+ *   importações terminarem, ref vazia, e o ResizeObserver que remede as passagens com atraso.
+ * GSAP, ScrollTrigger e Lenis são trocados por fakes que registram o que recebem.
+ */
+
+type Call = unknown[];
+const mockTimelines: Array<{ calls: Call[] }> = [];
+const mockTicker = {
+  add: jest.fn(),
+  remove: jest.fn(),
+  lagSmoothing: jest.fn(),
+  time: 0,
+};
+const mockLenis: MockLenis[] = [];
+
+class MockLenis {
+  isScrolling: false | "smooth" = false;
+  on = jest.fn();
+  raf = jest.fn();
+  scrollTo = jest.fn();
+  destroy = jest.fn();
+  constructor(public options: unknown) {
+    mockLenis.push(this);
+  }
+}
+
+jest.mock("gsap", () => ({
+  gsap: {
+    registerPlugin: jest.fn(),
+    ticker: mockTicker,
+    context: (fn: () => void) => {
+      fn();
+      return { revert: jest.fn() };
+    },
+    timeline: () => {
+      const record = { calls: [] as Call[] };
+      mockTimelines.push(record);
+      const chain = {
+        fromTo: (...args: Call) => {
+          record.calls.push(args);
+          return chain;
+        },
+      };
+      return chain;
+    },
+  },
+}));
+jest.mock("gsap/ScrollTrigger", () => ({
+  ScrollTrigger: { update: jest.fn(), refresh: jest.fn() },
+}));
+jest.mock("lenis", () => ({
+  __esModule: true,
+  get default() {
+    return MockLenis;
+  },
+}));
+
+const TOPS: Record<string, number> = {
+  home: 0,
+  projects: 1800,
+  "projects-title": 1900,
+  edge: 2400,
+  contact: 25000,
+  "footer-note": 26000,
+};
+
+function Home({ attach = true }: { attach?: boolean }) {
+  const ref = useRef<HTMLElement>(null);
+  useCinematicScroll(ref);
+  return (
+    <>
+      <main ref={attach ? ref : undefined}>
+        <section id="home" data-top={TOPS.home}>
+          <a href="/#contact">contato</a>
+          <a href="/#projects">projetos</a>
+          <a href="/#projects-title">titulo dos projetos</a>
+          <a href="/#edge">limite</a>
+          <a href="/#footer-note">nota fora da cena</a>
+          <a href="/#nao-existe">fantasma</a>
+          <a href="/#%E0%A4%A">malformado</a>
+          <a href="/outra#contact">outra pagina</a>
+          <a href="https://example.com/#contact">outro site</a>
+          <a href="/">sem ancora</a>
+          <a href="/#">ancora vazia</a>
+          <a href="/#contact" target="_blank" rel="noopener">
+            nova aba
+          </a>
+          <a href="/#contact" target="_self">
+            mesma aba
+          </a>
+          <svg aria-hidden="true">
+            <a href="/#contact">
+              <text>svg</text>
+            </a>
+          </svg>
+          <p id="plain">texto</p>
+        </section>
+        <section id="projects" data-top={TOPS.projects}>
+          <h2 id="projects-title" data-top={TOPS["projects-title"]}>
+            Projetos
+          </h2>
+        </section>
+        <section id="edge" data-top={TOPS.edge}>
+          <h2>Limite</h2>
+        </section>
+        {/* biome-ignore lint/a11y/noNoninteractiveTabindex: alvo de âncora que já traz tabindex, para testar que ele é mantido */}
+        <section id="contact" data-top={TOPS.contact} tabIndex={0}>
+          <h2>Contato</h2>
+        </section>
+      </main>
+      <p id="footer-note" data-top={TOPS["footer-note"]}>
+        Nota
+      </p>
+    </>
+  );
+}
+
+const originalMatchMedia = window.matchMedia;
+const OriginalResizeObserver = global.ResizeObserver;
+const originalOffsetTop = Object.getOwnPropertyDescriptor(
+  HTMLElement.prototype,
+  "offsetTop",
+);
+
+function mockMedia(active: string[]) {
+  window.matchMedia = jest.fn().mockImplementation((query: string) => ({
+    matches: active.includes(query),
+    media: query,
+    addEventListener() {},
+    removeEventListener() {},
+  }));
+}
+
+async function flushImports() {
+  await act(async () => {
+    for (let i = 0; i < 10; i++) await Promise.resolve();
+  });
+}
+
+async function mount(props: { attach?: boolean } = {}) {
+  const view = render(<Home {...props} />);
+  await flushImports();
+  return view;
+}
+
+function link(text: string) {
+  const found = [...document.querySelectorAll("a, svg a")].find(
+    (element) => element.textContent === text,
+  );
+  if (!found) throw new Error(`Missing link ${text}`);
+  return found as Element;
+}
+
+/**
+ * Dispara um clique e diz se o hook cancelou a ação padrão. A ação padrão do navegador (navegar) é cancelada
+ * por um ouvinte na fase de bolha, depois de o hook ter decidido, para o jsdom não navegar de verdade.
+ */
+function click(
+  target: Element | Document,
+  init: MouseEventInit = {},
+): { prevented: boolean } {
+  const event = new MouseEvent("click", {
+    bubbles: true,
+    cancelable: true,
+    button: 0,
+    ...init,
+  });
+  let prevented = false;
+  const observe = (clickEvent: Event) => {
+    prevented = clickEvent.defaultPrevented;
+    clickEvent.preventDefault();
+  };
+  window.addEventListener("click", observe);
+  try {
+    act(() => {
+      target.dispatchEvent(event);
+    });
+  } finally {
+    window.removeEventListener("click", observe);
+  }
+  return { prevented };
+}
+
+function mockHeaderOffset(px: string) {
+  jest
+    .spyOn(window, "getComputedStyle")
+    .mockReturnValue({ scrollPaddingTop: px } as CSSStyleDeclaration);
+}
+
+beforeAll(() => {
+  Object.defineProperty(HTMLElement.prototype, "offsetTop", {
+    configurable: true,
+    get(this: HTMLElement) {
+      return Number(this.dataset.top ?? 0);
+    },
+  });
+});
+
+afterAll(() => {
+  if (originalOffsetTop)
+    Object.defineProperty(
+      HTMLElement.prototype,
+      "offsetTop",
+      originalOffsetTop,
+    );
+});
+
+beforeEach(() => {
+  mockTimelines.length = 0;
+  mockLenis.length = 0;
+  mockTicker.add.mockClear();
+  mockTicker.remove.mockClear();
+  mockTicker.lagSmoothing.mockClear();
+  mockTicker.time = 0;
+  jest.mocked(ScrollTrigger.update).mockClear();
+  jest.mocked(ScrollTrigger.refresh).mockClear();
+  mockMedia([]);
+  window.history.replaceState(null, "", "/");
+  jest.spyOn(window, "scrollTo").mockImplementation(() => {});
+  Object.defineProperty(window, "innerHeight", {
+    configurable: true,
+    value: 800,
+  });
+  Object.defineProperty(window, "scrollY", { configurable: true, value: 0 });
+});
+
+afterEach(() => {
+  window.matchMedia = originalMatchMedia;
+  global.ResizeObserver = OriginalResizeObserver;
+  jest.useRealTimers();
+  jest.restoreAllMocks();
+});
+
+describe("useCinematicScroll: cliques que voltam ao navegador", () => {
+  it.each(["metaKey", "ctrlKey", "shiftKey", "altKey"] as const)(
+    "path: click with %s held -> left alone (new tab / selection behavior)",
+    async (modifier) => {
+      await mount();
+
+      const { prevented } = click(link("contato"), { [modifier]: true });
+
+      expect(prevented).toBe(false);
+      expect(mockLenis[0].scrollTo).not.toHaveBeenCalled();
+    },
+  );
+
+  it.each([1, 2])(
+    "path: click with mouse button %i -> left alone",
+    async (button) => {
+      await mount();
+
+      const { prevented } = click(link("contato"), { button });
+
+      expect(prevented).toBe(false);
+      expect(mockLenis[0].scrollTo).not.toHaveBeenCalled();
+    },
+  );
+
+  it("path: another handler already cancelled the click -> not handled again", async () => {
+    await mount();
+    const cancel = (event: Event) => event.preventDefault();
+    window.addEventListener("click", cancel, true);
+    try {
+      click(link("contato"));
+    } finally {
+      window.removeEventListener("click", cancel, true);
+    }
+
+    expect(mockLenis[0].scrollTo).not.toHaveBeenCalled();
+  });
+
+  it("path: click on text that is not inside a link -> ignored", async () => {
+    await mount();
+
+    const { prevented } = click(document.getElementById("plain") as Element);
+
+    expect(prevented).toBe(false);
+    expect(mockLenis[0].scrollTo).not.toHaveBeenCalled();
+  });
+
+  it("path: the click target is the document itself (not an element) -> ignored", async () => {
+    await mount();
+
+    const { prevented } = click(document);
+
+    expect(prevented).toBe(false);
+    expect(mockLenis[0].scrollTo).not.toHaveBeenCalled();
+  });
+
+  it("path: the closest link is an SVG anchor -> ignored", async () => {
+    await mount();
+
+    const { prevented } = click(
+      document.querySelector("svg a text") as Element,
+    );
+
+    expect(prevented).toBe(false);
+    expect(mockLenis[0].scrollTo).not.toHaveBeenCalled();
+  });
+
+  it("path: link opens in a new tab -> ignored", async () => {
+    await mount();
+
+    const { prevented } = click(link("nova aba"));
+
+    expect(prevented).toBe(false);
+    expect(mockLenis[0].scrollTo).not.toHaveBeenCalled();
+  });
+
+  it("path: link with target=_self -> handled like a plain link", async () => {
+    await mount();
+
+    const { prevented } = click(link("mesma aba"));
+
+    expect(prevented).toBe(true);
+    expect(mockLenis[0].scrollTo).toHaveBeenCalledTimes(1);
+  });
+
+  it.each([
+    ["to another site", "outro site"],
+    ["to another page of this site", "outra pagina"],
+    ["without an anchor", "sem ancora"],
+    ["with an empty anchor (#)", "ancora vazia"],
+  ])("path: link %s -> ignored", async (_label, text) => {
+    await mount();
+
+    const { prevented } = click(link(text));
+
+    expect(prevented).toBe(false);
+    expect(mockLenis[0].scrollTo).not.toHaveBeenCalled();
+  });
+
+  it("path: anchor with broken percent-encoding -> no error, left to the browser", async () => {
+    await mount();
+
+    const { prevented } = click(link("malformado"));
+
+    expect(prevented).toBe(false);
+    expect(mockLenis[0].scrollTo).not.toHaveBeenCalled();
+  });
+
+  it("path: anchor to an id that does not exist -> left to the browser", async () => {
+    await mount();
+
+    const { prevented } = click(link("fantasma"));
+
+    expect(prevented).toBe(false);
+    expect(mockLenis[0].scrollTo).not.toHaveBeenCalled();
+  });
+});
+
+describe("useCinematicScroll: para onde a página vai", () => {
+  it("path: target inside a scene -> goes to the target minus the fixed header, never above the scene top", async () => {
+    await mount();
+    mockHeaderOffset("80px");
+
+    click(link("titulo dos projetos"));
+
+    expect(mockLenis[0].scrollTo.mock.calls[0][0]).toBe(1900 - 80);
+  });
+
+  it("path: header taller than the gap to the scene top -> clamped to the scene top", async () => {
+    await mount();
+    mockHeaderOffset("300px");
+
+    click(link("titulo dos projetos"));
+
+    expect(mockLenis[0].scrollTo.mock.calls[0][0]).toBe(1800);
+  });
+
+  it("path: target is the whole scene -> the scene top, ignoring the header offset", async () => {
+    await mount();
+    mockHeaderOffset("80px");
+
+    click(link("projetos"));
+
+    expect(mockLenis[0].scrollTo.mock.calls[0][0]).toBe(1800);
+  });
+
+  it("path: target outside every scene -> measured from the page top, minus the header", async () => {
+    await mount();
+    mockHeaderOffset("100px");
+
+    const { prevented } = click(link("nota fora da cena"));
+
+    expect(prevented).toBe(true);
+    expect(mockLenis[0].scrollTo.mock.calls[0][0]).toBe(26000 - 100);
+  });
+
+  it("path: no readable header offset -> treated as zero", async () => {
+    await mount();
+    mockHeaderOffset("");
+
+    click(link("titulo dos projetos"));
+
+    expect(mockLenis[0].scrollTo.mock.calls[0][0]).toBe(1900);
+  });
+});
+
+describe("useCinematicScroll: histórico e foco", () => {
+  it("path: a new anchor -> pushes it to the history and cancels the default jump", async () => {
+    await mount();
+    const push = jest.spyOn(window.history, "pushState");
+
+    const { prevented } = click(link("projetos"));
+
+    expect(prevented).toBe(true);
+    expect(push).toHaveBeenCalledWith(null, "", "#projects");
+    expect(window.location.hash).toBe("#projects");
+  });
+
+  it("path: the anchor is already the current one -> the history is not touched, the page still scrolls", async () => {
+    window.history.replaceState(null, "", "/#projects");
+    await mount();
+    const push = jest.spyOn(window.history, "pushState");
+
+    click(link("projetos"));
+
+    expect(push).not.toHaveBeenCalled();
+    expect(mockLenis[0].scrollTo).toHaveBeenCalledTimes(1);
+  });
+
+  it("path: destination without tabindex -> gets tabindex -1 and the focus (no scroll jump)", async () => {
+    await mount();
+    const focus = jest.spyOn(HTMLElement.prototype, "focus");
+    const target = document.getElementById("projects-title") as HTMLElement;
+    expect(target.hasAttribute("tabindex")).toBe(false);
+
+    click(link("titulo dos projetos"));
+
+    expect(target.getAttribute("tabindex")).toBe("-1");
+    expect(focus).toHaveBeenCalledWith({ preventScroll: true });
+    expect(document.activeElement).toBe(target);
+  });
+
+  it("path: destination that already has a tabindex -> kept as it was", async () => {
+    await mount();
+    const target = document.getElementById("contact") as HTMLElement;
+    expect(target.getAttribute("tabindex")).toBe("0");
+
+    click(link("contato"));
+
+    expect(target.getAttribute("tabindex")).toBe("0");
+    expect(document.activeElement).toBe(target);
+  });
+});
+
+describe("useCinematicScroll: salto direto x rolagem curta", () => {
+  it("path: anchor exactly 3 screens away -> still animated, capped at 0.8 s", async () => {
+    await mount();
+
+    click(link("limite")); // 2400 px = 3 telas de 800 px
+
+    const [, options] = mockLenis[0].scrollTo.mock.calls[0];
+    expect(options.immediate).toBe(false);
+    expect(options.duration).toBe(0.8);
+  });
+
+  it("path: anchor just beyond 3 screens -> instant jump with zero duration", async () => {
+    await mount();
+    Object.defineProperty(window, "innerHeight", {
+      configurable: true,
+      value: 799,
+    });
+
+    click(link("limite")); // 2400 px passam de 3 x 799
+
+    const [, options] = mockLenis[0].scrollTo.mock.calls[0];
+    expect(options.immediate).toBe(true);
+    expect(options.duration).toBe(0);
+  });
+
+  it("path: anchor already at the current position -> a minimal animation (0.3 s), not a jump", async () => {
+    Object.defineProperty(window, "scrollY", {
+      configurable: true,
+      value: 1800,
+    });
+    await mount();
+
+    click(link("projetos"));
+
+    const [top, options] = mockLenis[0].scrollTo.mock.calls[0];
+    expect(top).toBe(1800);
+    expect(options.immediate).toBe(false);
+    expect(options.duration).toBeCloseTo(0.3, 9);
+  });
+
+  it("path: scrolled far down, a near anchor above -> distance counts in absolute value", async () => {
+    Object.defineProperty(window, "scrollY", {
+      configurable: true,
+      value: 2400,
+    });
+    await mount();
+
+    click(link("projetos")); // 600 px acima
+
+    const [, options] = mockLenis[0].scrollTo.mock.calls[0];
+    expect(options.immediate).toBe(false);
+    expect(options.duration).toBeCloseTo(0.3 + (600 / 800) * 0.2, 9);
+  });
+
+  it("path: touch screen (no Lenis) -> the native scroll is used: smooth when near, instant when far", async () => {
+    mockMedia(["(pointer: coarse)"]);
+    await mount();
+
+    click(link("projetos"));
+    click(link("contato"));
+
+    expect(window.scrollTo).toHaveBeenNthCalledWith(1, {
+      top: 1800,
+      behavior: "smooth",
+    });
+    expect(window.scrollTo).toHaveBeenNthCalledWith(2, {
+      top: 25000,
+      behavior: "instant",
+    });
+  });
+});
+
+describe("useCinematicScroll: Lenis e o relógio do GSAP", () => {
+  it("path: mouse -> Lenis gets the smoothing options and drives ScrollTrigger; the GSAP lag smoothing is turned off", async () => {
+    await mount();
+
+    expect(mockLenis).toHaveLength(1);
+    expect(mockLenis[0].options).toEqual({
+      lerp: 0.075,
+      wheelMultiplier: 0.85,
+    });
+    expect(mockLenis[0].on).toHaveBeenCalledWith(
+      "scroll",
+      ScrollTrigger.update,
+    );
+    expect(mockTicker.lagSmoothing).toHaveBeenCalledWith(0);
+    expect(mockTicker.add).toHaveBeenCalledTimes(1);
+  });
+
+  it("path: touch -> no Lenis, no ticker, no lag-smoothing change and the passages are still created", async () => {
+    mockMedia(["(pointer: coarse)"]);
+    await mount();
+
+    expect(mockLenis).toHaveLength(0);
+    expect(mockTicker.add).not.toHaveBeenCalled();
+    expect(mockTicker.lagSmoothing).not.toHaveBeenCalled();
+    expect(mockTimelines.length).toBeGreaterThan(0);
+  });
+
+  it("path: touch -> window scroll events do not touch the clock", async () => {
+    mockMedia(["(pointer: coarse)"]);
+    await mount();
+
+    act(() => {
+      window.dispatchEvent(new Event("scroll"));
+      window.dispatchEvent(new Event("wheel"));
+    });
+
+    expect(mockTicker.add).not.toHaveBeenCalled();
+  });
+
+  it("path: the clock went to sleep, then a native scroll event -> wakes it", async () => {
+    await mount();
+    const tick = mockTicker.add.mock.calls[0][0] as (time: number) => void;
+    tick(IDLE_SECONDS + 1); // parado há mais que o tempo de espera
+    expect(mockTicker.remove).toHaveBeenCalledTimes(1);
+    mockTicker.time = 5;
+
+    act(() => {
+      window.dispatchEvent(new Event("scroll"));
+    });
+
+    expect(mockTicker.add).toHaveBeenCalledTimes(2);
+  });
+
+  it("path: the clock went to sleep, then an anchor click -> wakes it before scrolling", async () => {
+    await mount();
+    const tick = mockTicker.add.mock.calls[0][0] as (time: number) => void;
+    tick(IDLE_SECONDS + 1);
+
+    click(link("projetos"));
+
+    expect(mockTicker.add).toHaveBeenCalledTimes(2);
+    expect(mockLenis[0].scrollTo).toHaveBeenCalledTimes(1);
+  });
+
+  it("path: the clock is already asleep and the page unmounts -> it is not removed twice", async () => {
+    const view = await mount();
+    const tick = mockTicker.add.mock.calls[0][0] as (time: number) => void;
+    tick(IDLE_SECONDS + 1);
+    expect(mockTicker.remove).toHaveBeenCalledTimes(1);
+
+    view.unmount();
+
+    expect(mockTicker.remove).toHaveBeenCalledTimes(1);
+    expect(mockLenis[0].destroy).toHaveBeenCalledTimes(1);
+  });
+
+  it("path: Lenis still scrolling -> the tick keeps the clock awake and feeds it in milliseconds", async () => {
+    await mount();
+    const tick = mockTicker.add.mock.calls[0][0] as (time: number) => void;
+    mockLenis[0].isScrolling = "smooth";
+
+    tick(IDLE_SECONDS * 10);
+    tick(IDLE_SECONDS * 10 + IDLE_SECONDS / 2);
+
+    expect(mockLenis[0].raf).toHaveBeenLastCalledWith(
+      (IDLE_SECONDS * 10 + IDLE_SECONDS / 2) * 1000,
+    );
+    expect(mockTicker.remove).not.toHaveBeenCalled();
+  });
+});
+
+describe("useCinematicScroll: montagem e desmontagem", () => {
+  it("path: unmounted before the dynamic imports finish -> nothing is created", async () => {
+    const view = render(<Home />);
+    view.unmount();
+    await flushImports();
+
+    expect(mockTimelines).toHaveLength(0);
+    expect(mockLenis).toHaveLength(0);
+    expect(mockTicker.add).not.toHaveBeenCalled();
+  });
+
+  it("path: ref not attached to an element -> the hook does nothing", async () => {
+    await mount({ attach: false });
+
+    expect(mockTimelines).toHaveLength(0);
+    expect(mockLenis).toHaveLength(0);
+  });
+
+  it("path: reduced motion -> nothing, and anchor clicks are left to the browser", async () => {
+    mockMedia(["(prefers-reduced-motion: reduce)"]);
+    await mount();
+
+    const { prevented } = click(link("projetos"));
+
+    expect(prevented).toBe(false);
+    expect(mockLenis).toHaveLength(0);
+  });
+
+  it("path: unmount -> the document click listener and the wheel/scroll listeners are removed", async () => {
+    const view = await mount();
+    const removeDocument = jest.spyOn(document, "removeEventListener");
+    const removeWindow = jest.spyOn(window, "removeEventListener");
+
+    view.unmount();
+
+    expect(removeDocument).toHaveBeenCalledWith(
+      "click",
+      expect.any(Function),
+      true,
+    );
+    expect(removeWindow.mock.calls.map(([type]) => type)).toEqual(
+      expect.arrayContaining(["wheel", "scroll"]),
+    );
+  });
+});
+
+describe("useCinematicScroll: remedida depois de a página mudar de altura", () => {
+  type Resize = { callback: () => void; disconnect: jest.Mock };
+  let resizers: Resize[] = [];
+
+  beforeEach(() => {
+    resizers = [];
+    global.ResizeObserver = class {
+      private readonly record: Resize;
+      constructor(callback: () => void) {
+        this.record = { callback, disconnect: jest.fn() };
+        resizers.push(this.record);
+      }
+      observe() {}
+      unobserve() {}
+      disconnect() {
+        this.record.disconnect();
+      }
+    } as unknown as typeof ResizeObserver;
+  });
+
+  it("path: several size changes in a row -> one refresh, 150 ms after the last", async () => {
+    jest.useFakeTimers();
+    await mount();
+
+    act(() => {
+      resizers[0].callback();
+      jest.advanceTimersByTime(100);
+      resizers[0].callback();
+      jest.advanceTimersByTime(149);
+    });
+    expect(ScrollTrigger.refresh).not.toHaveBeenCalled();
+
+    act(() => {
+      jest.advanceTimersByTime(1);
+    });
+    expect(ScrollTrigger.refresh).toHaveBeenCalledTimes(1);
+  });
+
+  it("path: unmount with a refresh pending -> the refresh never happens and the observer is disconnected", async () => {
+    jest.useFakeTimers();
+    const view = await mount();
+    act(() => {
+      resizers[0].callback();
+    });
+
+    view.unmount();
+    act(() => {
+      jest.advanceTimersByTime(1000);
+    });
+
+    expect(ScrollTrigger.refresh).not.toHaveBeenCalled();
+    expect(resizers[0].disconnect).toHaveBeenCalledTimes(1);
+  });
+});

app/components/cinematic/useCinematicScroll.test.tsx

@@ -0,0 +1,517 @@
+import { act, render } from "@testing-library/react";
+import { useRef } from "react";
+import {
+  anchorDuration,
+  ENTER_OFFSET,
+  enterScene,
+  exitScene,
+  IDLE_SECONDS,
+  JUMP_SCREENS,
+  MAX_ANCHOR_SECONDS,
+  PASSAGE_END,
+  useCinematicScroll,
+} from "./useCinematicScroll";
+
+/* ------------------------------------------------------------------------------------------------
+ * Passagem de verdade (GSAP real, sem ScrollTrigger): o que cada cena recebe no começo e no fim.
+ * ------------------------------------------------------------------------------------------------ */
+
+// o resto do arquivo troca o GSAP por um fake: aqui vale o de verdade
+const { gsap: realGsap } = jest.requireActual<typeof import("gsap")>("gsap");
+
+function scene() {
+  const element = document.createElement("section");
+  document.body.append(element);
+  return element;
+}
+
+function timeline() {
+  return realGsap.timeline({
+    paused: true,
+    defaults: { ease: "none", duration: 1 },
+  });
+}
+
+const translateY = (element: HTMLElement) =>
+  Number(
+    /translate(?:3d)?\(\s*[-\d.]+(?:px)?,\s*([-\d.]+)px/.exec(
+      element.style.transform,
+    )?.[1] ?? Number.NaN,
+  );
+
+describe("the single passage between scenes", () => {
+  afterEach(() => {
+    document.body.innerHTML = "";
+  });
+
+  it("brings the next scene in with a fade and a short vertical offset, nothing else", () => {
+    expect(ENTER_OFFSET).toBeGreaterThanOrEqual(24);
+    expect(ENTER_OFFSET).toBeLessThanOrEqual(40);
+
+    const next = scene();
+    const tl = timeline();
+    enterScene(tl, next);
+
+    tl.progress(0.0001);
+    expect(Number(next.style.opacity)).toBeLessThan(0.01);
+    expect(translateY(next)).toBeCloseTo(ENTER_OFFSET, 0);
+
+    tl.progress(0.5);
+    expect(Number(next.style.opacity)).toBeGreaterThan(0.2);
+    expect(Number(next.style.opacity)).toBeLessThan(1);
+    expect(translateY(next)).toBeGreaterThan(0);
+    expect(translateY(next)).toBeLessThan(ENTER_OFFSET);
+
+    // sem recorte, escala, giro nem visibility em nenhum ponto
+    for (const progress of [0.0001, 0.3, 0.7]) {
+      tl.progress(progress);
+      expect(next.style.clipPath).toBe("");
+      expect(next.style.visibility).toBe("");
+      expect(next.style.transform).not.toMatch(/scale|rotate/);
+    }
+  });
+
+  it("leaves no inline style behind once the scene has arrived, and brings it back on the way up", () => {
+    const next = scene();
+    const tl = timeline();
+    enterScene(tl, next);
+
+    tl.progress(1);
+    expect(next.style.opacity).toBe("");
+    expect(next.style.transform).toBe("");
+
+    tl.progress(0.4);
+    expect(Number(next.style.opacity)).toBeLessThan(1);
+    expect(next.style.transform).not.toBe("");
+  });
+
+  it("fades the previous scene all the way to opacity 0 at the end of every passage", () => {
+    const previous = scene();
+    const tl = timeline();
+    exitScene(tl, previous);
+
+    tl.progress(0.5);
+    expect(Number(previous.style.opacity)).toBeGreaterThan(0);
+    expect(Number(previous.style.opacity)).toBeLessThan(1);
+    expect(previous.style.visibility).toBe("");
+    expect(previous.style.clipPath).toBe("");
+
+    tl.progress(1);
+    expect(previous.style.opacity).toBe("0");
+
+    // rolando de volta, a cena reaparece inteira
+    tl.progress(0.0001);
+    expect(Number(previous.style.opacity)).toBeGreaterThan(0.99);
+  });
+
+  it("a scene in the middle of the page arrives, stays, and leaves at 0 without fighting itself", () => {
+    const middle = scene();
+    const arrive = timeline();
+    const leave = timeline();
+    enterScene(arrive, middle);
+    exitScene(leave, middle);
+
+    arrive.progress(1);
+    expect(middle.style.opacity).toBe("");
+    leave.progress(1);
+    expect(middle.style.opacity).toBe("0");
+    leave.progress(0);
+    arrive.progress(0.2);
+    expect(Number(middle.style.opacity)).toBeLessThan(0.5);
+  });
+});
+
+describe("anchor travel", () => {
+  it("jumps straight to far anchors and animates near ones for 0.8 s at most", () => {
+    expect(MAX_ANCHOR_SECONDS).toBe(0.8);
+    const viewport = 800;
+    expect(anchorDuration(25000, viewport)).toBeNull();
+    expect(anchorDuration(-25000, viewport)).toBeNull();
+    expect(
+      anchorDuration(viewport * (JUMP_SCREENS + 0.5), viewport),
+    ).toBeNull();
+
+    for (const distance of [0, 200, 800, 1600, viewport * JUMP_SCREENS]) {
+      const seconds = anchorDuration(distance, viewport);
+      expect(seconds).not.toBeNull();
+      expect(seconds as number).toBeGreaterThan(0);
+      expect(seconds as number).toBeLessThanOrEqual(MAX_ANCHOR_SECONDS);
+    }
+  });
+});
+
+/* ------------------------------------------------------------------------------------------------
+ * O hook: GSAP, ScrollTrigger e Lenis trocados por fakes que registram o que recebem.
+ * ------------------------------------------------------------------------------------------------ */
+
+type Call = unknown[];
+const mockTimelines: Array<{ vars: ScrollTriggerLike; calls: Call[] }> = [];
+const mockTicker = {
+  add: jest.fn(),
+  remove: jest.fn(),
+  lagSmoothing: jest.fn(),
+  time: 0,
+};
+const mockLenis: MockLenis[] = [];
+
+interface ScrollTriggerLike {
+  scrollTrigger: {
+    trigger: HTMLElement;
+    start: () => number;
+    end: () => number;
+    scrub: boolean;
+    onEnter?: () => void;
+  };
+}
+
+class MockLenis {
+  isScrolling: false | "smooth" = false;
+  on = jest.fn();
+  raf = jest.fn();
+  scrollTo = jest.fn();
+  destroy = jest.fn();
+  constructor(public options: unknown) {
+    mockLenis.push(this);
+  }
+}
+
+jest.mock("gsap", () => ({
+  gsap: {
+    registerPlugin: jest.fn(),
+    ticker: mockTicker,
+    context: (fn: () => void) => {
+      fn();
+      return { revert: jest.fn() };
+    },
+    timeline: (vars: ScrollTriggerLike) => {
+      const record = { vars, calls: [] as Call[] };
+      mockTimelines.push(record);
+      const chain = {
+        fromTo: (...args: Call) => {
+          record.calls.push(args);
+          return chain;
+        },
+      };
+      return chain;
+    },
+  },
+}));
+jest.mock("gsap/ScrollTrigger", () => ({
+  ScrollTrigger: { update: jest.fn(), refresh: jest.fn() },
+}));
+jest.mock("lenis", () => ({
+  __esModule: true,
+  get default() {
+    return MockLenis;
+  },
+}));
+
+const TOPS: Record<string, number> = {
+  home: 0,
+  projects: 1800,
+  short: 3000,
+  about: 3300,
+  contact: 25000,
+};
+
+function Home() {
+  const ref = useRef<HTMLElement>(null);
+  useCinematicScroll(ref);
+  return (
+    <main ref={ref}>
+      <section id="home" data-top={TOPS.home}>
+        <a href="/#contact">Conversar</a>
+        <a href="/#projects">Projetos</a>
+      </section>
+      <section id="projects" data-top={TOPS.projects}>
+        <h2>Projetos</h2>
+      </section>
+      {/* uma cena mais curta que a tela: a saída dela não pode começar antes de a entrada terminar */}
+      <section id="short" data-top={TOPS.short}>
+        <h2>Curta</h2>
+      </section>
+      <section id="about" data-top={TOPS.about}>
+        <h2>Sobre</h2>
+      </section>
+      <section id="contact" data-top={TOPS.contact}>
+        <h2>Contato</h2>
+      </section>
+    </main>
+  );
+}
+
+const originalMatchMedia = window.matchMedia;
+const originalOffsetTop = Object.getOwnPropertyDescriptor(
+  HTMLElement.prototype,
+  "offsetTop",
+);
+
+function mockMedia(active: string[]) {
+  window.matchMedia = jest.fn().mockImplementation((query: string) => ({
+    matches: active.includes(query),
+    media: query,
+    addEventListener() {},
+    removeEventListener() {},
+  }));
+}
+
+async function mount() {
+  const view = render(<Home />);
+  // as importações dinâmicas do hook (gsap, ScrollTrigger, Lenis) resolvem em microtarefas
+  await act(async () => {
+    for (let i = 0; i < 10; i++) await Promise.resolve();
+  });
+  return view;
+}
+
+const scenes = () =>
+  Array.from(document.querySelectorAll<HTMLElement>("main > section"));
+
+beforeAll(() => {
+  Object.defineProperty(HTMLElement.prototype, "offsetTop", {
+    configurable: true,
+    get(this: HTMLElement) {
+      return Number(this.dataset.top ?? 0);
+    },
+  });
+});
+
+afterAll(() => {
+  if (originalOffsetTop)
+    Object.defineProperty(
+      HTMLElement.prototype,
+      "offsetTop",
+      originalOffsetTop,
+    );
+});
+
+beforeEach(() => {
+  mockTimelines.length = 0;
+  mockLenis.length = 0;
+  mockTicker.add.mockClear();
+  mockTicker.remove.mockClear();
+  mockTicker.lagSmoothing.mockClear();
+  mockTicker.time = 0;
+  mockMedia([]);
+  window.history.replaceState(null, "", "/");
+  jest.spyOn(window, "scrollTo").mockImplementation(() => {});
+  Object.defineProperty(window, "innerHeight", {
+    configurable: true,
+    value: 800,
+  });
+});
+
+afterEach(() => {
+  window.matchMedia = originalMatchMedia;
+  jest.restoreAllMocks();
+});
+
+describe("useCinematicScroll", () => {
+  it("never hides a scene: no visibility, no sticky pin, nothing inline before the scroll runs", async () => {
+    await mount();
+    for (const element of scenes()) {
+      expect(element.style.visibility).toBe("");
+      expect(element.style.position).toBe("");
+      expect(element.style.top).toBe("");
+      expect(element.style.opacity).toBe("");
+      expect(element.style.clipPath).toBe("");
+    }
+    // o texto do contato continua achável (Ctrl+F) e visível para leitores de tela
+    const contact = document.getElementById("contact") as HTMLElement;
+    expect(contact).toBeVisible();
+    expect(contact).toHaveTextContent("Contato");
+    expect(contact.closest("[aria-hidden]")).toBeNull();
+  });
+
+  it("uses one passage only: opacity and a vertical offset, with the previous scene ending at 0", async () => {
+    await mount();
+    const allowed = new Set([
+      "opacity",
+      "y",
+      "ease",
+      "clearProps",
+      "immediateRender",
+    ]);
+    const entering: HTMLElement[] = [];
+    const leaving: HTMLElement[] = [];
+
+    for (const { vars, calls } of mockTimelines) {
+      expect(vars.scrollTrigger.scrub).toBe(true);
+      expect(calls).toHaveLength(1);
+      const [target, from, to] = calls[0] as [
+        HTMLElement,
+        Record<string, unknown>,
+        Record<string, unknown>,
+      ];
+      for (const key of [...Object.keys(from), ...Object.keys(to)])
+        expect(allowed.has(key)).toBe(true);
+      expect(JSON.stringify([from, to])).not.toMatch(
+        /autoAlpha|visibility|clipPath|scale|rotation|xPercent/,
+      );
+      if (to.opacity === 1) {
+        entering.push(target);
+        expect(from).toMatchObject({ opacity: 0, y: ENTER_OFFSET });
+        expect(vars.scrollTrigger.trigger).toBe(target);
+      } else {
+        leaving.push(target);
+        expect(from).toMatchObject({ opacity: 1 });
+        expect(to.opacity).toBe(0);
+      }
+    }
+
+    const all = scenes();
+    // todas entram, menos a primeira; todas saem, menos a última
+    expect(entering).toEqual(all.slice(1));
+    expect(leaving).toEqual(all.slice(0, -1));
+  });
+
+  it("starts each exit only after the same scene finished entering, even for a scene shorter than the screen", async () => {
+    await mount();
+    const all = scenes();
+    const ranges = new Map<
+      HTMLElement,
+      { enter?: [number, number]; exit?: [number, number] }
+    >();
+    for (const { vars, calls } of mockTimelines) {
+      const target = calls[0][0] as HTMLElement;
+      const to = calls[0][2] as { opacity: number };
+      const { start, end } = vars.scrollTrigger;
+      const entry = ranges.get(target) ?? {};
+      if (to.opacity === 1) entry.enter = [start(), end()];
+      else entry.exit = [start(), end()];
+      ranges.set(target, entry);
+    }
+
+    const vh = window.innerHeight;
+    for (const element of all.slice(1)) {
+      const top = TOPS[element.id];
+      expect(ranges.get(element)?.enter).toEqual([
+        top - vh,
+        top - vh * PASSAGE_END,
+      ]);
+    }
+    for (const element of all.slice(0, -1)) {
+      const { enter, exit } = ranges.get(element) ?? {};
+      expect(exit).toBeDefined();
+      const [start, end] = exit as [number, number];
+      expect(start).toBeLessThan(end);
+      // termina quando o topo da cena seguinte chegou ao fim da passagem dela
+      const next = all[all.indexOf(element) + 1];
+      expect(end).toBe(TOPS[next.id] - vh * PASSAGE_END);
+      if (enter) expect(start).toBeGreaterThanOrEqual(enter[1]);
+    }
+    // a cena curta (300 px): a saída começa onde a entrada acabou, não 500 px antes
+    const short = ranges.get(document.getElementById("short") as HTMLElement);
+    expect(short?.exit?.[0]).toBe(short?.enter?.[1]);
+  });
+
+  it("does no scroll work for users who prefer reduced motion", async () => {
+    mockMedia(["(prefers-reduced-motion: reduce)"]);
+    await mount();
+    expect(mockTimelines).toHaveLength(0);
+    expect(mockLenis).toHaveLength(0);
+    expect(mockTicker.add).not.toHaveBeenCalled();
+  });
+
+  describe("smooth scroll", () => {
+    it("is not created on a touch screen, where the passages still run on the native scroll", async () => {
+      mockMedia(["(pointer: coarse)"]);
+      await mount();
+      expect(mockLenis).toHaveLength(0);
+      expect(mockTicker.add).not.toHaveBeenCalled();
+      expect(mockTicker.lagSmoothing).not.toHaveBeenCalled();
+      expect(mockTimelines.length).toBeGreaterThan(0);
+    });
+
+    it("is created with a mouse, and the GSAP clock sleeps once the scroll is idle and wakes on the wheel", async () => {
+      await mount();
+      expect(mockLenis).toHaveLength(1);
+      const lenis = mockLenis[0];
+      expect(mockTicker.add).toHaveBeenCalledTimes(1);
+      const tick = mockTicker.add.mock.calls[0][0] as (time: number) => void;
+
+      // rolando: segue ligado e alimenta o Lenis em milissegundos
+      lenis.isScrolling = "smooth";
+      tick(0.5);
+      expect(lenis.raf).toHaveBeenLastCalledWith(500);
+      expect(mockTicker.remove).not.toHaveBeenCalled();
+
+      // parado há mais que o tempo de espera: o relógio é solto
+      lenis.isScrolling = false;
+      tick(0.5 + IDLE_SECONDS / 2);
+      expect(mockTicker.remove).not.toHaveBeenCalled();
+      tick(0.5 + IDLE_SECONDS + 0.1);
+      expect(mockTicker.remove).toHaveBeenCalledTimes(1);
+      expect(mockTicker.remove).toHaveBeenCalledWith(tick);
+
+      // a roda do mouse o acorda de novo
+      mockTicker.time = 10;
+      act(() => {
+        window.dispatchEvent(new Event("wheel"));
+      });
+      expect(mockTicker.add).toHaveBeenCalledTimes(2);
+      // e uma roda seguinte, com o relógio já ligado, não o liga duas vezes
+      act(() => {
+        window.dispatchEvent(new Event("wheel"));
+      });
+      expect(mockTicker.add).toHaveBeenCalledTimes(2);
+    });
+
+    it("jumps straight to a far anchor (the header button to #contact) and animates a near one for 0.8 s at most", async () => {
+      await mount();
+      const lenis = mockLenis[0];
+
+      act(() => {
+        (document.querySelector('a[href="/#contact"]') as HTMLElement).click();
+      });
+      expect(lenis.scrollTo).toHaveBeenCalledTimes(1);
+      const [farTop, farOptions] = lenis.scrollTo.mock.calls[0];
+      expect(farTop).toBe(TOPS.contact);
+      expect(farOptions).toMatchObject({ immediate: true });
+      expect(window.location.hash).toBe("#contact");
+      expect(document.getElementById("contact")).toHaveFocus();
+
+      act(() => {
+        (document.querySelector('a[href="/#projects"]') as HTMLElement).click();
+      });
+      const [nearTop, nearOptions] = lenis.scrollTo.mock.calls[1];
+      expect(nearTop).toBe(TOPS.projects);
+      expect(nearOptions.immediate).toBe(false);
+      expect(nearOptions.duration).toBeGreaterThan(0);
+      expect(nearOptions.duration).toBeLessThanOrEqual(MAX_ANCHOR_SECONDS);
+    });
+
+    it("without Lenis (touch) a far anchor is an instant jump", async () => {
+      mockMedia(["(pointer: coarse)"]);
+      await mount();
+      act(() => {
+        (document.querySelector('a[href="/#contact"]') as HTMLElement).click();
+      });
+      expect(window.scrollTo).toHaveBeenCalledWith({
+        top: TOPS.contact,
+        behavior: "instant",
+      });
+
+      act(() => {
+        (document.querySelector('a[href="/#projects"]') as HTMLElement).click();
+      });
+      expect(window.scrollTo).toHaveBeenLastCalledWith({
+        top: TOPS.projects,
+        behavior: "smooth",
+      });
+    });
+
+    it("releases the clock, the listeners and Lenis when the page unmounts", async () => {
+      const view = await mount();
+      const lenis = mockLenis[0];
+      view.unmount();
+      expect(lenis.destroy).toHaveBeenCalledTimes(1);
+      expect(mockTicker.remove).toHaveBeenCalled();
+      mockTicker.add.mockClear();
+      act(() => {
+        window.dispatchEvent(new Event("wheel"));
+      });
+      expect(mockTicker.add).not.toHaveBeenCalled();
+    });
+  });
+});

app/components/cinematic/useCinematicScroll.ts

@@ -1,40 +1,41 @@
 "use client";
 
 import { type RefObject, useEffect } from "react";
-
-type Transition = (
-  tl: gsap.core.Timeline,
-  prev: HTMLElement,
-  next: HTMLElement,
-  touch: boolean,
-) => void;
+import { isCoarsePointer, prefersReducedMotion } from "@/lib/device";
 
 /*
- * Rolagem como um vídeo: o Lenis suaviza a roda do mouse e o GSAP liga cada passagem de seção à posição
- * da rolagem (rolar para cima volta o "vídeo").
+ * Rolagem como um vídeo: o GSAP liga cada passagem de uma cena para a seguinte à posição da rolagem (rolar
+ * para cima volta o "vídeo") e, no mouse, o Lenis suaviza a roda.
  *
- * Quem segura as seções paradas durante uma passagem:
- * - a que SAI fica com position: sticky (topo = altura da tela − altura da seção): ela para quando o fim
- *   dela chega ao fim da tela. Quem mantém isso é o compositor do navegador, na mesma batida da rolagem;
- * - a que ENTRA só fica parada no topo no desktop (deslocamento pelo GSAP). Com a roda do mouse, o Lenis
- *   rola e desloca no mesmo quadro. No toque, a rolagem nativa corre em outra thread e o deslocamento
- *   chegava um quadro atrasado: em rolagens rápidas a seção tremia. Por isso, no toque, ela sobe com o
- *   dedo e a passagem usa só efeitos que não disputam a posição (recorte, transparência, giro, escala).
+ * Uma única passagem para a home inteira, só com opacidade e um deslocamento vertical curto:
+ * - a cena que entra chega com fade e sobe ENTER_OFFSET px até o lugar dela;
+ * - a cena que sai some com fade e termina SEMPRE em opacidade 0 (nenhuma cena anterior fica "fantasma" atrás
+ *   das seguintes);
+ * - nada de recorte (clip-path), escala ou rotação, e nenhuma cena é escondida com visibility: o conteúdo
+ *   nasce visível no HTML do servidor e a opacidade só muda por rolagem (Ctrl+F e leitores de tela enxergam
+ *   tudo, e sem JavaScript tudo aparece).
+ * As cenas ficam no fluxo normal da página, uma depois da outra. A única rolagem "presa" é a do CSS: o hero
+ * (sticky) e a vitrine de projetos (sticky); este arquivo não prende nada.
  *
- * Regras que mantêm tudo estável:
- * - cada tween termina até o tempo 1 da timeline (a trava de posição dura exatamente 1);
- * - nenhum ancestral de um <canvas> recebe scale (o R3F mede o canvas com getBoundingClientRect);
- * - cada cena só fica visível da passagem em que entra até a passagem em que sai (com folga), para não
- *   aparecer atrás de transparências e para o navegador não pintar o que está coberto.
- * Os valores são funções para serem recalculados quando a janela muda de tamanho (invalidateOnRefresh).
+ * Cada cena tem uma entrada e uma saída, cada uma com o próprio gatilho, e a saída só começa depois que a
+ * entrada da mesma cena terminou (cenas curtas não brigam pela mesma opacidade). Qualquer filho direto de
+ * <main> é uma cena; nada aqui depende de uma seção específica existir.
  */
 
-const vh = () => window.innerHeight;
-// origem no meio da parte visível da seção que sai (a última altura de tela dela)
-const visibleCenter = (el: HTMLElement) => () =>
-  `50% ${el.offsetHeight - vh() / 2}px`;
+/** Deslocamento vertical, em px, com que a cena chega (entre 24 e 40). */
+export const ENTER_OFFSET = 32;
+/** A passagem corre enquanto o topo da cena que entra sobe de 1 altura de tela até esta fração dela. */
+export const PASSAGE_END = 0.2;
+/** Âncoras mais distantes que isto (em alturas de tela) são um salto direto. */
+export const JUMP_SCREENS = 3;
+/** Nenhuma âncora anima por mais que isto. */
+export const MAX_ANCHOR_SECONDS = 0.8;
+/** Depois deste tempo parada, a rolagem suave solta o relógio do GSAP. */
+export const IDLE_SECONDS = 1;
 
-/** Topo do elemento na página pelo layout (offsetTop ignora os transforms das transições, getBoundingClientRect não). */
+const vh = () => window.innerHeight;
+
+/** Topo do elemento na página pelo layout (offsetTop ignora os transforms das passagens, getBoundingClientRect não). */
 function pageTop(el: HTMLElement) {
   let top = 0;
   for (
@@ -46,125 +47,38 @@ function pageTop(el: HTMLElement) {
   return top;
 }
 
-// a seção que entra fica parada no topo (só desktop, ver o comentário acima)
-const holdNext = (tl: gsap.core.Timeline, next: HTMLElement) =>
-  tl.fromTo(next, { y: () => -vh() }, { y: 0 }, 0);
+/** A cena chega: fade e subida curta. Ao terminar, o estilo inline some (sem transform sobrando na cena). */
+export function enterScene(tl: gsap.core.Timeline, scene: HTMLElement) {
+  tl.fromTo(
+    scene,
+    { opacity: 0, y: ENTER_OFFSET },
+    {
+      opacity: 1,
+      y: 0,
+      ease: "power2.out",
+      clearProps: "opacity,transform",
+      immediateRender: false,
+    },
+    0,
+  );
+}
 
-// uma linguagem diferente por passagem, na ordem das seções da home
-const TRANSITIONS: Transition[] = [
-  // hero → projetos: o mergulho termina no escuro, o hero some e os projetos abrem como tela de cinema
-  (tl, prev, next, touch) => {
-    tl.fromTo(prev, { autoAlpha: 1 }, { autoAlpha: 0, duration: 0.4 }, 0);
-    if (touch) {
-      tl.fromTo(
-        next,
-        {
-          opacity: 0.3,
-          clipPath: "inset(0% 5% 0% 5% round 28px 28px 0px 0px)",
-        },
-        { opacity: 1, clipPath: "inset(0% 0% 0% 0% round 0px 0px 0px 0px)" },
-        0,
-      );
-      return;
-    }
-    holdNext(tl, next);
-    const band = (open: number) => () =>
-      `inset(${(vh() * (1 - open)) / 2}px 0px ${next.offsetHeight - vh() + (vh() * (1 - open)) / 2}px 0px)`;
-    tl.fromTo(
-      next,
-      { opacity: 0, clipPath: band(0.36) },
-      { opacity: 1, clipPath: band(1), duration: 0.65 },
-      0.35,
-    );
-  },
-  // projetos → modalidades: uma íris se abre enquanto a anterior avança contra a câmera
-  (tl, prev, next, touch) => {
-    tl.fromTo(
-      prev,
-      { scale: 1, opacity: 1, transformOrigin: visibleCenter(prev) },
-      { scale: 1.18, opacity: 0.2 },
-      0,
-    );
-    // no toque a seção sobe com o dedo: a íris nasce do topo dela, como uma bolha subindo
-    const center = () => (touch ? "at 50% 0px" : `at 50% ${vh() / 2}px`);
-    const radius = () =>
-      touch
-        ? Math.hypot(window.innerWidth / 2, vh())
-        : Math.hypot(window.innerWidth / 2, vh() / 2);
-    if (!touch) holdNext(tl, next);
-    // power1.in: o círculo cresce devagar no começo, sem tomar a tela antes do fim da passagem
-    tl.fromTo(
-      next,
-      { clipPath: () => `circle(0px ${center()})` },
-      {
-        clipPath: () => `circle(${radius()}px ${center()})`,
-        ease: "power1.in",
-      },
-      0,
-    );
-  },
-  // modalidades → IA: corte lateral, uma tela empurra a outra
-  (tl, prev, next, touch) => {
-    if (!touch) holdNext(tl, next);
-    tl.fromTo(
-      prev,
-      { xPercent: 0, opacity: 1 },
-      { xPercent: -35, opacity: 0.3 },
-      0,
-    ).fromTo(next, { xPercent: 100 }, { xPercent: 0, ease: "power2.out" }, 0);
-  },
-  // IA → qualidade: a seção sobe como um cartão sobre a anterior, que escurece.
-  // Só translate/opacity: recorte animado, escala (o Chrome rasteriza de novo a cada novo tamanho) e o
-  // desenho do diagrama a cada quadro dobravam o custo de pintura desta passagem. O diagrama se desenha
-  // uma vez, em CSS, quando a passagem começa (classe is-drawing, ver onEnter).
-  (tl, prev, next, touch) => {
-    tl.fromTo(prev, { opacity: 1 }, { opacity: 0.2 }, 0);
-    // no desktop ela sobe um pouco mais rápido que a rolagem; no toque, só com o dedo
-    if (!touch)
-      tl.fromTo(
-        next,
-        { y: () => vh() * 0.35 },
-        { y: 0, ease: "power2.out" },
-        0,
-      );
-  },
-  // qualidade → sobre: a página entra girando pela esquerda, como uma folha virando (só transform)
-  (tl, prev, next, touch) => {
-    if (!touch) holdNext(tl, next);
-    tl.fromTo(
-      prev,
-      { opacity: 1, xPercent: 0 },
-      { opacity: 0.25, xPercent: 20 },
-      0,
-    ).fromTo(
-      next,
-      { xPercent: -100, rotation: -7, transformOrigin: "0% 0%" },
-      { xPercent: 0, rotation: 0, ease: "power2.out" },
-      0,
-    );
-  },
-  // sobre → contato: o contato cresce do centro, como um zoom de câmera
-  (tl, prev, next, touch) => {
-    if (!touch) holdNext(tl, next);
-    tl.fromTo(
-      prev,
-      { scale: 1, opacity: 1, transformOrigin: visibleCenter(prev) },
-      { scale: 0.92, opacity: 0.2 },
-      0,
-    )
-      .fromTo(
-        next,
-        {
-          scale: touch ? 0.8 : 0.55,
-          clipPath: "inset(0% round 56px)",
-          transformOrigin: () => (touch ? "50% 0%" : `50% ${vh() / 2}px`),
-        },
-        { scale: 1, clipPath: "inset(0% round 0px)", ease: "power2.out" },
-        0,
-      )
-      .fromTo(next, { autoAlpha: 0 }, { autoAlpha: 1, duration: 0.2 }, 0);
-  },
-];
+/** A cena sai: fade até 0. É o último estado dela até a rolagem voltar. */
+export function exitScene(tl: gsap.core.Timeline, scene: HTMLElement) {
+  tl.fromTo(
+    scene,
+    { opacity: 1 },
+    { opacity: 0, ease: "power2.in", immediateRender: false },
+    0,
+  );
+}
+
+/** Duração (s) da rolagem até uma âncora a `distance` px; `null` = salto direto. */
+export function anchorDuration(distance: number, viewport: number) {
+  const screens = Math.abs(distance) / Math.max(1, viewport);
+  if (screens > JUMP_SCREENS) return null;
+  return Math.min(MAX_ANCHOR_SECONDS, 0.3 + screens * 0.2);
+}
 
 const easeInOutCubic = (t: number) =>
   t < 0.5 ? 4 * t * t * t : 1 - (-2 * t + 2) ** 3 / 2;
@@ -173,109 +87,103 @@ export function useCinematicScroll(mainRef: RefObject<HTMLElement | null>) {
   useEffect(() => {
     const main = mainRef.current;
     if (!main) return;
-    if (window.matchMedia("(prefers-reduced-motion: reduce)").matches) return;
+    if (prefersReducedMotion()) return;
     let cancelled = false;
     let cleanup = () => {};
 
     (async () => {
-      const [{ gsap }, { ScrollTrigger }, { default: Lenis }] =
-        await Promise.all([
-          import("gsap"),
-          import("gsap/ScrollTrigger"),
-          import("lenis"),
-        ]);
+      // no toque a rolagem nativa corre em outra thread: sem Lenis (e sem baixar o pacote)
+      const smooth = !isCoarsePointer();
+      const [{ gsap }, { ScrollTrigger }, lenisModule] = await Promise.all([
+        import("gsap"),
+        import("gsap/ScrollTrigger"),
+        smooth ? import("lenis") : Promise.resolve(null),
+      ]);
       if (cancelled) return;
       gsap.registerPlugin(ScrollTrigger);
 
-      const lenis = new Lenis({ lerp: 0.075, wheelMultiplier: 0.85 });
-      lenis.on("scroll", ScrollTrigger.update);
-      const tick = (time: number) => lenis.raf(time * 1000);
-      gsap.ticker.add(tick);
-      gsap.ticker.lagSmoothing(0);
+      // Lenis: o relógio do GSAP só roda enquanto a rolagem anima; parada por IDLE_SECONDS, ele é solto
+      const lenis = lenisModule
+        ? new lenisModule.default({ lerp: 0.075, wheelMultiplier: 0.85 })
+        : null;
+      let awake = false;
+      let lastBusy = 0;
+      const tick = (time: number) => {
+        lenis?.raf(time * 1000);
+        if (lenis?.isScrolling) lastBusy = time;
+        else if (time - lastBusy > IDLE_SECONDS) sleep();
+      };
+      function sleep() {
+        if (!awake) return;
+        awake = false;
+        gsap.ticker.remove(tick);
+      }
+      const wake = () => {
+        if (!lenis) return;
+        lastBusy = gsap.ticker.time;
+        if (awake) return;
+        awake = true;
+        gsap.ticker.add(tick);
+      };
+      if (lenis) {
+        lenis.on("scroll", ScrollTrigger.update);
+        gsap.ticker.lagSmoothing(0);
+        wake();
+        window.addEventListener("wheel", wake, { passive: true });
+        window.addEventListener("scroll", wake, { passive: true });
+      }
 
-      // toque: rolagem nativa em outra thread, sem trava de posição pelo JavaScript
-      const touch = window.matchMedia(
-        "(hover: none) and (pointer: coarse)",
-      ).matches;
       const scenes = Array.from(main.children) as HTMLElement[];
-      // Topo de cada cena somando as alturas das anteriores (as cenas são contíguas): com sticky, o
-      // offsetTop de uma cena presa passa a incluir o deslocamento dela.
-      const sceneTops = () => {
-        let top = pageTop(main);
-        return scenes.map((scene) => {
-          const current = top;
-          top += scene.offsetHeight;
-          return current;
-        });
-      };
-      const stick = () => {
-        for (const scene of scenes)
-          scene.style.top = `${Math.min(0, vh() - scene.offsetHeight)}px`;
-      };
-
       const context = gsap.context(() => {
         scenes.forEach((scene, index) => {
-          // quem entra fica por cima; o hero, que sai por dissolução, fica por cima da cena seguinte
-          gsap.set(scene, {
-            position: "sticky",
-            zIndex: index === 0 ? 30 : index + 1,
+          const following = scenes[index + 1];
+          const trigger = (
+            start: () => number,
+            end: () => number,
+            extra: ScrollTrigger.Vars = {},
+          ) => ({
+            trigger: scene,
+            start,
+            end,
+            scrub: true,
+            invalidateOnRefresh: true,
+            ...extra,
           });
-        });
-        stick();
-        TRANSITIONS.forEach((transition, index) => {
-          const prev = scenes[index];
-          const next = scenes[index + 1];
-          if (!prev || !next) return;
-          const tl = gsap.timeline({
-            defaults: { ease: "none", duration: 1 },
-            scrollTrigger: {
-              trigger: next,
-              start: () => sceneTops()[index + 1] - vh(),
-              end: () => sceneTops()[index + 1],
-              scrub: true,
-              invalidateOnRefresh: true,
-              // passagem concluída: o recorte já cobre a tela inteira; sem ele a seção pinta normalmente
-              onLeave: () => gsap.set(next, { clipPath: "none" }),
-              // diagrama de qualidade: desenha uma vez quando a seção começa a entrar
-              onEnter: () => next.classList.add("is-drawing"),
-            },
-          });
-          transition(tl, prev, next, touch);
+          const timeline = (vars: ScrollTrigger.Vars) =>
+            gsap.timeline({
+              defaults: { ease: "none", duration: 1 },
+              scrollTrigger: vars,
+            });
+
+          if (index > 0)
+            enterScene(
+              timeline(
+                trigger(
+                  () => pageTop(scene) - vh(),
+                  () => pageTop(scene) - vh() * PASSAGE_END,
+                ),
+              ),
+              scene,
+            );
+          if (following)
+            exitScene(
+              timeline(
+                trigger(
+                  // só depois de a própria entrada terminar, mesmo numa cena mais curta que a tela
+                  () =>
+                    Math.max(
+                      pageTop(scene) - vh() * PASSAGE_END,
+                      pageTop(following) - vh(),
+                    ),
+                  () => pageTop(following) - vh() * PASSAGE_END,
+                ),
+              ),
+              scene,
+            );
         });
       }, main);
 
-      // Visibilidade pela posição da rolagem: cada cena só existe na tela da passagem em que entra até a
-      // passagem em que sai. Folga para o quadro de atraso entre a rolagem nativa e este cálculo: um quarto
-      // de tela depois da saída e, no toque, meia tela antes da entrada (lá a cena sobe com o dedo; no
-      // desktop ela já nasce presa no topo e só pode aparecer quando a passagem começa).
-      let frame = 0;
-      const syncVisibility = () => {
-        frame = 0;
-        const y = window.scrollY;
-        const tops = sceneTops();
-        scenes.forEach((scene, index) => {
-          const from =
-            index === 0 ? -Infinity : tops[index] - vh() * (touch ? 1.5 : 1);
-          const to =
-            index === scenes.length - 1
-              ? Infinity
-              : tops[index + 1] + vh() * 0.25;
-          const visibility = y >= from && y <= to ? "" : "hidden";
-          if (scene.style.visibility !== visibility)
-            scene.style.visibility = visibility;
-        });
-      };
-      const queueSync = () => {
-        if (!frame) frame = requestAnimationFrame(syncVisibility);
-      };
-      const onRefresh = () => {
-        stick();
-        queueSync();
-      };
-      syncVisibility();
-      ScrollTrigger.addEventListener("refresh", onRefresh);
-      window.addEventListener("scroll", queueSync, { passive: true });
-      // a página mudou de altura (fontes, imagens, "Experiência" aberta ou fechada): o GSAP remede as passagens
+      // a página mudou de altura (fontes, imagens, seções que abrem e fecham): o GSAP remede as passagens
       let refreshTimer: ReturnType<typeof setTimeout> | undefined;
       const resizeObserver = new ResizeObserver(() => {
         clearTimeout(refreshTimer);
@@ -283,7 +191,25 @@ export function useCinematicScroll(mainRef: RefObject<HTMLElement | null>) {
       });
       resizeObserver.observe(main);
 
-      // botões e links internos: em vez do salto, a página "avança o vídeo" até o destino
+      const scrollToTop = (top: number) => {
+        const distance = top - window.scrollY;
+        const duration = anchorDuration(distance, vh());
+        if (lenis) {
+          wake();
+          lenis.scrollTo(top, {
+            immediate: duration === null,
+            duration: duration ?? 0,
+            easing: easeInOutCubic,
+          });
+        } else {
+          window.scrollTo({
+            top,
+            behavior: duration === null ? "instant" : "smooth",
+          });
+        }
+      };
+
+      // botões e links internos: em vez do salto, a página "avança o vídeo" (de pouco) até o destino
       const onClick = (event: MouseEvent) => {
         if (
           event.defaultPrevented ||
@@ -318,55 +244,37 @@ export function useCinematicScroll(mainRef: RefObject<HTMLElement | null>) {
         } catch {}
         if (!target) return;
         event.preventDefault();
-        // nunca para no meio de uma passagem: no mínimo onde termina a entrada da cena que contém o alvo;
-        // alvos internos descontam o cabeçalho fixo (posição relativa à cena, que não muda se ela estiver presa)
-        const index = scenes.findIndex((candidate) =>
-          candidate.contains(target),
+        // o alvo é a cena inteira: para no topo dela; alvo interno: desconta o cabeçalho fixo, sem passar do topo da cena
+        const destination = target;
+        const scene = scenes.find((candidate) =>
+          candidate.contains(destination),
         );
         const offset =
           Number.parseFloat(
             getComputedStyle(document.documentElement).scrollPaddingTop,
           ) || 0;
-        const sceneTop = index < 0 ? 0 : sceneTops()[index];
+        const sceneTop = scene ? pageTop(scene) : 0;
         const top =
-          index <= 0
-            ? 0
-            : Math.max(
-                sceneTop,
-                scenes[index] === target
-                  ? 0
-                  : sceneTop +
-                      pageTop(target) -
-                      pageTop(scenes[index]) -
-                      offset,
-              );
+          scene === destination
+            ? sceneTop
+            : Math.max(sceneTop, pageTop(destination) - offset);
         if (location.hash !== url.hash) history.pushState(null, "", url.hash);
-        lenis.scrollTo(top, {
-          duration: Math.min(2.8, 1 + Math.abs(top - window.scrollY) / 8000),
-          easing: easeInOutCubic,
-          // o foco vai depois: antes de a cena entrar ela está invisível e não aceita foco
-          onComplete: () => {
-            if (!target.hasAttribute("tabindex")) target.tabIndex = -1;
-            target.focus({ preventScroll: true });
-          },
-        });
+        scrollToTop(top);
+        // o foco vai junto: a cena já está no fluxo, visível e pronta para recebê-lo
+        if (!destination.hasAttribute("tabindex")) destination.tabIndex = -1;
+        destination.focus({ preventScroll: true });
       };
       document.addEventListener("click", onClick, true);
 
       cleanup = () => {
         document.removeEventListener("click", onClick, true);
-        ScrollTrigger.removeEventListener("refresh", onRefresh);
-        window.removeEventListener("scroll", queueSync);
-        cancelAnimationFrame(frame);
+        window.removeEventListener("wheel", wake);
+        window.removeEventListener("scroll", wake);
         clearTimeout(refreshTimer);
         resizeObserver.disconnect();
         context.revert();
-        for (const scene of scenes) {
-          scene.style.visibility = "";
-          scene.style.top = "";
-        }
-        gsap.ticker.remove(tick);
-        lenis.destroy();
+        sleep();
+        lenis?.destroy();
       };
     })();
 

app/components/showcase/BrowserFrame.paths.test.tsx

@@ -0,0 +1,141 @@
+import { render } from "@testing-library/react";
+import { BrowserFrame, displayUrl } from "./BrowserFrame";
+
+/**
+ * Testes de caminhos-base de displayUrl e BrowserFrame (complemento de BrowserFrame.test.tsx): cada condição
+ * da escolha do endereço (demoUrl válido, caminho, www, porta, esquema, github e parentes, URL inválida,
+ * título vazio) e as variações da moldura (cadeado, texto padrão, className).
+ */
+
+describe("displayUrl", () => {
+  it.each([
+    ["https://sevmodaintima.com.br", "sevmodaintima.com.br", true],
+    ["https://sevmodaintima.com.br/", "sevmodaintima.com.br", true],
+    [
+      "https://www.sevmodaintima.com.br/loja/",
+      "sevmodaintima.com.br/loja",
+      true,
+    ],
+    ["https://x.example.com/a/b/", "x.example.com/a/b", true],
+    ["https://x.example.com/a?q=1#topo", "x.example.com/a", true],
+    ["http://x.example.com", "x.example.com", false],
+    ["https://x.example.com:8443/app", "x.example.com:8443/app", true],
+    ["https://sub.www.example.com", "sub.www.example.com", true],
+    ["https://notgithub.com", "notgithub.com", true],
+    ["https://github.com.evil.example", "github.com.evil.example", true],
+    ["ftp://files.example.com/pasta", "files.example.com/pasta", false],
+  ])("path: demoUrl %s -> %s (secure: %s)", (demoUrl, text, secure) => {
+    expect(displayUrl({ demoUrl, title: "Projeto" })).toEqual({ text, secure });
+  });
+
+  it.each([
+    "https://github.com/evandrodevbr/projeto",
+    "https://GITHUB.COM/evandrodevbr",
+    "https://gist.github.com/x",
+    "https://www.github.com",
+  ])(
+    "path: demoUrl %s points at GitHub -> falls back to the title",
+    (demoUrl) => {
+      expect(displayUrl({ demoUrl, title: "Projeto" })).toEqual({
+        text: "Projeto",
+        secure: false,
+      });
+    },
+  );
+
+  it("path: demoUrl does not parse -> falls back to the title", () => {
+    expect(displayUrl({ demoUrl: "isto nao e url", title: "Projeto" })).toEqual(
+      {
+        text: "Projeto",
+        secure: false,
+      },
+    );
+  });
+
+  it.each([
+    ["null demoUrl", { demoUrl: null, title: "Projeto" }],
+    ["empty demoUrl", { demoUrl: "", title: "Projeto" }],
+    ["missing demoUrl", { title: "Projeto" }],
+  ])("path: %s with a title -> the title, never secure", (_label, project) => {
+    expect(displayUrl(project)).toEqual({ text: "Projeto", secure: false });
+  });
+
+  it.each([
+    ["no fields", {}],
+    ["empty title", { title: "" }],
+    ["null title and no demo", { title: null, demoUrl: null }],
+    ["github demo and no title", { demoUrl: "https://github.com/x" }],
+    ["invalid demo and empty title", { demoUrl: "???", title: "" }],
+  ])("path: %s -> null", (_label, project) => {
+    expect(displayUrl(project)).toBeNull();
+  });
+});
+
+describe("BrowserFrame", () => {
+  it("path: secure address -> lock icon plus the address text", () => {
+    const { container } = render(
+      <BrowserFrame url={{ text: "exemplo.com.br", secure: true }}>
+        <p>tela</p>
+      </BrowserFrame>,
+    );
+
+    expect(container.querySelector(".ds-bframe-url svg")).not.toBeNull();
+    expect(container.querySelector(".ds-bframe-url")).toHaveTextContent(
+      "exemplo.com.br",
+    );
+  });
+
+  it("path: insecure address -> text without the lock", () => {
+    const { container } = render(
+      <BrowserFrame url={{ text: "Projeto", secure: false }}>
+        <p>tela</p>
+      </BrowserFrame>,
+    );
+
+    expect(container.querySelector(".ds-bframe-url svg")).toBeNull();
+    expect(container.querySelector(".ds-bframe-url")).toHaveTextContent(
+      "Projeto",
+    );
+  });
+
+  it("path: no address -> neutral label and no lock", () => {
+    const { container } = render(
+      <BrowserFrame url={null}>
+        <p>tela</p>
+      </BrowserFrame>,
+    );
+
+    expect(container.querySelector(".ds-bframe-url svg")).toBeNull();
+    expect(container.querySelector(".ds-bframe-url")).toHaveTextContent(
+      "pré-visualização",
+    );
+  });
+
+  it("path: className and style given -> both reach the wrapper, with no stray space", () => {
+    const { container } = render(
+      <BrowserFrame
+        url={null}
+        className="ds-reel-laptop"
+        style={{ width: "88%" }}
+      >
+        <p>tela</p>
+      </BrowserFrame>,
+    );
+
+    const frame = container.firstElementChild as HTMLElement;
+    expect(frame.className).toBe("ds-bframe ds-reel-laptop");
+    expect(frame.style.width).toBe("88%");
+  });
+
+  it("path: no className -> the class has no trailing space", () => {
+    const { container } = render(
+      <BrowserFrame url={null}>
+        <p>tela</p>
+      </BrowserFrame>,
+    );
+
+    expect((container.firstElementChild as HTMLElement).className).toBe(
+      "ds-bframe",
+    );
+  });
+});

app/components/showcase/BrowserFrame.test.tsx

@@ -20,24 +20,39 @@ describe("displayUrl", () => {
     });
   });
 
-  it("falls back to the code address when there is no live demo", () => {
-    expect(
-      displayUrl({ demoUrl: null, githubUrl: "https://github.com/user/repo" }),
-    ).toEqual({ text: "github.com/user/repo", secure: true });
+  it("shows only the project name, never a code address, when there is no live demo", () => {
+    expect(displayUrl({ title: "AS Serviços", demoUrl: null })).toEqual({
+      text: "AS Serviços",
+      secure: false,
+    });
+    expect(displayUrl({ title: "AS Serviços" })).toEqual({
+      text: "AS Serviços",
+      secure: false,
+    });
+    // um projeto completo, com o endereço do código ainda nos dados, não vaza para a barra
+    const project = {
+      title: "Twins Lab",
+      demoUrl: "",
+      githubUrl: "https://github.com/user/repo",
+    };
+    expect(displayUrl(project)?.text).toBe("Twins Lab");
   });
 
-  it("skips an address that does not parse and uses the next one", () => {
-    expect(
-      displayUrl({
-        demoUrl: "isso não é uma url",
-        githubUrl: "https://github.com/a/b",
-      }),
-    ).toEqual({ text: "github.com/a/b", secure: true });
+  it("falls back to the project name when the address does not parse or points at github.com", () => {
+    const title = "Meu projeto";
+    const name = { text: title, secure: false };
+    expect(displayUrl({ title, demoUrl: "isso não é uma url" })).toEqual(name);
+    expect(displayUrl({ title, demoUrl: "https://github.com/a/b" })).toEqual(
+      name,
+    );
+    expect(displayUrl({ title, demoUrl: "https://www.github.com/a" })).toEqual(
+      name,
+    );
   });
 
   it("returns null when there is nothing to show", () => {
     expect(displayUrl({})).toBeNull();
-    expect(displayUrl({ demoUrl: "", githubUrl: null })).toBeNull();
+    expect(displayUrl({ title: "", demoUrl: "" })).toBeNull();
   });
 });
 

app/components/showcase/BrowserFrame.tsx

@@ -1,22 +1,27 @@
 import type { CSSProperties, ReactNode } from "react";
 
-/** Endereço mostrado na barra: o do site publicado, ou o do código quando não há demonstração. */
+/**
+ * Endereço mostrado na barra: o domínio real do site publicado (`demoUrl`). Sem demonstração, só o nome do
+ * projeto: o endereço do código nunca aparece (nada de github.com na interface).
+ */
 export function displayUrl(project: {
+  title?: string | null;
   demoUrl?: string | null;
-  githubUrl?: string | null;
 }): { text: string; secure: boolean } | null {
-  for (const raw of [project.demoUrl, project.githubUrl]) {
-    if (!raw) continue;
+  if (project.demoUrl) {
     try {
-      const url = new URL(raw);
-      const path = url.pathname === "/" ? "" : url.pathname.replace(/\/$/, "");
-      return {
-        text: `${url.host.replace(/^www\./, "")}${path}`,
-        secure: url.protocol === "https:",
-      };
+      const url = new URL(project.demoUrl);
+      if (!/(^|\.)github\.com$/i.test(url.hostname)) {
+        const path =
+          url.pathname === "/" ? "" : url.pathname.replace(/\/$/, "");
+        return {
+          text: `${url.host.replace(/^www\./, "")}${path}`,
+          secure: url.protocol === "https:",
+        };
+      }
     } catch {}
   }
-  return null;
+  return project.title ? { text: project.title, secure: false } : null;
 }
 
 /**

app/components/showcase/ProjectActions.tsx

@@ -0,0 +1,59 @@
+import Link from "next/link";
+import type { ShowcaseItem } from "./ShowcaseProvider";
+
+/** O site publicado abre em nova aba quando existe e não foi dado como fora do ar. */
+export function canOpenSite(project: ShowcaseItem["project"]) {
+  return Boolean(project.demoUrl) && project.demoAvailability !== "unavailable";
+}
+
+/**
+ * Ações de um projeto na vitrine: "Ver case" (contorno) leva ao estudo de caso; "Ampliar vídeo" (contorno,
+ * com ícone) abre a janela ampliada; "Abrir site" (link de texto, nova aba) só existe com `demoUrl`.
+ * Nenhuma é verde-limão: o preenchido de destaque é só da ação de contato.
+ */
+export function ProjectActions({
+  item,
+  onExpand,
+}: {
+  item: ShowcaseItem;
+  /** Sem a janela ampliada (antes de o navegador montar a página) o botão nem aparece. */
+  onExpand?: () => void;
+}) {
+  const { project } = item;
+  return (
+    <div className="ds-reel-actions">
+      <Link className="ds-link ds-link-muted" href={`/cases/${project.id}`}>
+        Ver case
+        <span className="sr-only"> de {project.title}</span>
+      </Link>
+      {onExpand && (
+        <button
+          type="button"
+          className="ds-link ds-link-muted ds-reel-expand"
+          onClick={onExpand}
+          aria-haspopup="dialog"
+        >
+          <svg viewBox="0 0 16 16" aria-hidden="true">
+            <path d="M9.5 2.5h4v4M6.5 13.5h-4v-4M13.5 2.5 9 7M2.5 13.5 7 9" />
+          </svg>
+          Ampliar vídeo
+          <span className="sr-only"> de {project.title}</span>
+        </button>
+      )}
+      {canOpenSite(project) && (
+        <a
+          className="ds-link ds-link-text"
+          href={project.demoUrl ?? undefined}
+          target="_blank"
+          rel="noopener noreferrer"
+        >
+          Abrir site
+          <span className="sr-only">
+            {" "}
+            de {project.title} (abre em nova aba)
+          </span>
+        </a>
+      )}
+    </div>
+  );
+}

app/components/showcase/ProjectLightbox.test.tsx

@@ -177,7 +177,7 @@ describe("ProjectLightbox", () => {
     );
 
     expect(video.currentTime).toBeCloseTo(
-      chapterFraction(lavacao, 2, "desktop") * lavacao.durations.desktop,
+      chapterFraction(lavacao, 1, "desktop") * lavacao.durations.desktop,
       5,
     );
     expect(
@@ -226,14 +226,72 @@ describe("ProjectLightbox", () => {
     expect(screen.getByRole("dialog")).toHaveAccessibleName("SEV Moda Íntima");
   });
 
-  it("offers the site and the code when they exist", () => {
+  it("offers the case and, when the site exists, a text link to it in a new tab; never the code", () => {
     const dialog = setup("lavacao-047");
     expect(
-      within(dialog).getByRole("link", { name: /Abrir projeto/ }),
-    ).toHaveAttribute("href", "https://landing-page-lavacao047.vercel.app");
+      within(dialog).getByRole("link", { name: /Ver case/ }),
+    ).toHaveAttribute("href", "/cases/lavacao-047");
+    const site = within(dialog).getByRole("link", { name: /Abrir site/ });
+    expect(site).toHaveAttribute(
+      "href",
+      "https://landing-page-lavacao047.vercel.app",
+    );
+    expect(site).toHaveAttribute("target", "_blank");
+    expect(site).toHaveClass("ds-link-text");
+    expect(dialog.querySelector(".ds-link-accent")).toBeNull();
+    expect(within(dialog).queryByRole("link", { name: /código/i })).toBeNull();
+    expect(dialog.innerHTML).not.toContain("github.com");
+  });
+
+  it("has no site link, and an address bar with only the project name, for a project without a live site", () => {
+    const dialog = setup("as-servicos");
     expect(
-      within(dialog).queryByRole("link", { name: /Ver codigo/ }),
+      within(dialog).queryByRole("link", { name: /Abrir site/ }),
     ).toBeNull();
+    expect(
+      within(dialog).getByRole("link", { name: /Ver case/ }),
+    ).toHaveAttribute("href", "/cases/as-servicos");
+    expect(dialog.querySelector(".ds-bframe-url")?.textContent).toBe(
+      "AS Serviços",
+    );
+  });
+
+  it("opens on the phone version below 768 px", () => {
+    const original = window.matchMedia;
+    window.matchMedia = jest.fn().mockImplementation((query: string) => ({
+      matches: query === "(max-width: 767px)",
+      media: query,
+      addEventListener() {},
+      removeEventListener() {},
+    }));
+    try {
+      const dialog = setup();
+      expect(
+        within(dialog).getByRole("button", { name: "Celular" }),
+      ).toHaveAttribute("aria-pressed", "true");
+      expect(dialog.querySelector(".ds-lb-phone")).not.toBeNull();
+    } finally {
+      window.matchMedia = original;
+    }
+  });
+
+  it("does not autoplay, nor preload the whole file, with the data saver on", () => {
+    Object.defineProperty(navigator, "connection", {
+      configurable: true,
+      value: { saveData: true },
+    });
+    try {
+      const dialog = setup();
+      const video = dialog.querySelector("video") as HTMLVideoElement;
+      expect(video).not.toHaveAttribute("autoplay");
+      expect(video).toHaveAttribute("preload", "metadata");
+      expect(HTMLMediaElement.prototype.play).not.toHaveBeenCalled();
+    } finally {
+      Object.defineProperty(navigator, "connection", {
+        configurable: true,
+        value: undefined,
+      });
+    }
   });
 
   it("closes with the close button, with the backdrop or with Esc, and unlocks the page", () => {

app/components/showcase/ProjectLightbox.tsx

@@ -1,5 +1,6 @@
 "use client";
 
+import Link from "next/link";
 import {
   type ChangeEvent,
   type CSSProperties,
@@ -13,6 +14,7 @@ import {
   useState,
 } from "react";
 import { useReducedMotion } from "@/app/hooks/useReducedMotion";
+import { isMobileViewport, isSaveData } from "@/lib/device";
 import {
   chapterFraction,
   chapterIndexAt,
@@ -56,12 +58,17 @@ export function ProjectLightbox({
   const pendingFraction = useRef<number | null>(null);
   const pressedOnBackdrop = useRef(false);
 
+  // celular abaixo de 768 px (lib/device.ts); a troca de aparelho continua à escolha do visitante
   const [device, setDevice] = useState<Device>(() =>
-    window.matchMedia("(max-width: 639px)").matches ? "mobile" : "desktop",
+    isMobileViewport() ? "mobile" : "desktop",
   );
   // o vídeo de cada aparelho/projeto nasce tocando só se o visitante não pausou e não pediu menos movimento
+  // "economizar dados": o arquivo só chega quando o visitante pede (play), não antes
+  const [saveData] = useState(isSaveData);
   const [autoplay, setAutoplay] = useState(
-    () => !window.matchMedia("(prefers-reduced-motion: reduce)").matches,
+    () =>
+      !window.matchMedia("(prefers-reduced-motion: reduce)").matches &&
+      !saveData,
   );
   const wantsToPlay = useRef(autoplay);
   const [playing, setPlaying] = useState(false);
@@ -199,7 +206,6 @@ export function ProjectLightbox({
   };
 
   const video = (
-    // biome-ignore lint/a11y/useMediaCaption: demonstração sem áudio; a descrição está no título e nos capítulos
     <video
       key={`${config.id}-${device}`}
       ref={videoRef}
@@ -208,7 +214,7 @@ export function ProjectLightbox({
       muted
       loop
       playsInline
-      preload="auto"
+      preload={saveData ? "metadata" : "auto"}
       poster={assets.poster}
       width={assets.width}
       height={assets.height}
@@ -249,9 +255,9 @@ export function ProjectLightbox({
               {String(index + 1).padStart(2, "0")} /{" "}
               {String(items.length).padStart(2, "0")}
             </p>
-            <h3 id={titleId} className="ds-lb-title">
+            <h2 id={titleId} className="ds-lb-title">
               {project.title}
-            </h3>
+            </h2>
           </div>
 
           <fieldset className="ds-lb-toggle">
@@ -371,25 +377,18 @@ export function ProjectLightbox({
         </ol>
 
         <div className="ds-lb-links">
+          <Link className="ds-link ds-link-muted" href={`/cases/${project.id}`}>
+            Ver case
+            <span className="sr-only"> de {project.title}</span>
+          </Link>
           {canOpenSite && (
             <a
-              className="ds-link ds-link-accent"
+              className="ds-link ds-link-text"
               href={project.demoUrl ?? undefined}
               target="_blank"
-              rel="noreferrer"
+              rel="noopener noreferrer"
             >
-              Abrir projeto
-              <span className="sr-only"> (abre em nova aba)</span>
-            </a>
-          )}
-          {project.githubUrl && (
-            <a
-              className="ds-link ds-link-muted"
-              href={project.githubUrl}
-              target="_blank"
-              rel="noreferrer"
-            >
-              Ver codigo
+              Abrir site
               <span className="sr-only"> (abre em nova aba)</span>
             </a>
           )}

app/components/showcase/ProjectList.paths.test.tsx

@@ -0,0 +1,173 @@
+import { act, fireEvent, render, screen, within } from "@testing-library/react";
+import { getFeaturedProjects } from "@/lib/portfolio-data";
+import { ProjectList } from "./ProjectList";
+import { buildShowcaseItems, ShowcaseProvider } from "./ShowcaseProvider";
+
+/**
+ * Testes de caminhos-base de ProjectList (e do ListItem dentro dela): sem aparelho (servidor), celular x desktop,
+ * longe x perto da janela (pôster), com e sem subtítulo, rótulo "pendente" e o botão de ampliar.
+ */
+
+jest.mock("./ProjectLightbox", () => ({
+  ProjectLightbox: ({ index }: { index: number }) => (
+    <div role="dialog" aria-label="ampliado">
+      aberto:{index}
+    </div>
+  ),
+}));
+
+type Callback = IntersectionObserverCallback;
+/** Cada observador criado, com o elemento que observa. */
+const observers: Array<{ callback: Callback; target?: Element }> = [];
+const Original = global.IntersectionObserver;
+
+const projects = getFeaturedProjects(null);
+const items = buildShowcaseItems(projects);
+
+beforeEach(() => {
+  observers.length = 0;
+  global.IntersectionObserver = class {
+    private readonly record: { callback: Callback; target?: Element };
+    constructor(callback: Callback) {
+      this.record = { callback };
+      observers.push(this.record);
+    }
+    observe(target: Element) {
+      this.record.target = target;
+    }
+    unobserve() {}
+    disconnect() {}
+    takeRecords() {
+      return [];
+    }
+  } as unknown as typeof IntersectionObserver;
+});
+
+afterEach(() => {
+  global.IntersectionObserver = Original;
+});
+
+function renderList(props: Partial<Parameters<typeof ProjectList>[0]> = {}) {
+  return render(
+    <ShowcaseProvider projects={projects}>
+      <ProjectList items={items} device="desktop" {...props} />
+    </ShowcaseProvider>,
+  );
+}
+
+function bringNear(target: Element) {
+  act(() => {
+    for (const observer of observers)
+      if (observer.target === target)
+        observer.callback(
+          [{ isIntersecting: true } as IntersectionObserverEntry],
+          {} as IntersectionObserver,
+        );
+  });
+}
+
+function bringAllNear(container: HTMLElement) {
+  for (const item of container.querySelectorAll("li.ds-reel-item"))
+    bringNear(item);
+}
+
+describe("ProjectList", () => {
+  it("path: device unknown (server / before mount) -> text and links only, no media and no expand button", () => {
+    const { container } = renderList({ device: null });
+
+    expect(container.querySelectorAll("li")).toHaveLength(items.length);
+    expect(container.querySelector("[data-device]")).toBeNull();
+    expect(container.querySelector(".ds-reel-item-media")).toBeNull();
+    expect(screen.queryByRole("button", { name: /Ampliar vídeo/ })).toBeNull();
+    expect(screen.getAllByRole("link", { name: /Ver case/ })).toHaveLength(
+      items.length,
+    );
+  });
+
+  it("path: desktop -> browser frame, poster only once the item is near the window", () => {
+    const { container } = renderList({ device: "desktop" });
+
+    expect(container.querySelectorAll(".ds-bframe")).toHaveLength(items.length);
+    expect(container.querySelector(".ds-phone")).toBeNull();
+    expect(container.querySelector("img")).toBeNull();
+
+    bringAllNear(container);
+
+    const images = [...container.querySelectorAll("img")];
+    expect(images).toHaveLength(items.length);
+    expect(images[0]).toHaveAttribute(
+      "alt",
+      `Captura de tela de ${items[0].project.title}`,
+    );
+    expect(decodeURIComponent(images[0].getAttribute("src") ?? "")).toContain(
+      "desktop.webp",
+    );
+    expect(images[0]).toHaveAttribute("sizes", "50vw");
+  });
+
+  it("path: mobile -> phone frame with the phone poster and the phone sizes", () => {
+    const { container } = renderList({ device: "mobile" });
+    bringAllNear(container);
+
+    expect(container.querySelectorAll(".ds-phone")).toHaveLength(items.length);
+    expect(container.querySelector(".ds-bframe")).toBeNull();
+    const image = container.querySelector("img") as HTMLImageElement;
+    expect(decodeURIComponent(image.getAttribute("src") ?? "")).toContain(
+      "mobile.webp",
+    );
+    expect(image).toHaveAttribute("sizes", "(max-width: 767px) 70vw");
+  });
+
+  it("path: an item that is not near yet keeps its frame but no image", () => {
+    const { container } = renderList({ device: "desktop" });
+    bringNear(container.querySelector("li.ds-reel-item") as Element);
+
+    expect(container.querySelectorAll("img")).toHaveLength(1);
+    expect(container.querySelectorAll(".ds-bframe")).toHaveLength(items.length);
+  });
+
+  it("path: project with a subtitle -> shown; without -> no subtitle paragraph", () => {
+    const withSubtitle = items.map((item, index) => ({
+      ...item,
+      project: { ...item.project, subtitle: index === 0 ? "Loja virtual" : "" },
+    }));
+
+    const { container } = render(
+      <ShowcaseProvider projects={projects}>
+        <ProjectList items={withSubtitle} device="desktop" />
+      </ShowcaseProvider>,
+    );
+
+    const subs = container.querySelectorAll(".ds-reel-sub");
+    expect(subs).toHaveLength(1);
+    expect(subs[0]).toHaveTextContent("Loja virtual");
+  });
+
+  it("path: pending -> the section is marked so CSS can hide it; not pending -> unmarked", () => {
+    const pending = renderList({ pending: true, device: null });
+    expect(pending.container.querySelector("section")).toHaveAttribute(
+      "data-pending",
+    );
+    pending.unmount();
+
+    const settled = renderList({ pending: false });
+    expect(settled.container.querySelector("section")).not.toHaveAttribute(
+      "data-pending",
+    );
+  });
+
+  it("path: pressing 'Ampliar vídeo' on an item -> opens the enlarged window on that project", () => {
+    renderList({ device: "desktop" });
+    const second = screen
+      .getByRole("heading", { level: 3, name: items[1].project.title })
+      .closest("li") as HTMLElement;
+
+    fireEvent.click(
+      within(second).getByRole("button", { name: /Ampliar vídeo/ }),
+    );
+
+    expect(screen.getByRole("dialog", { name: "ampliado" })).toHaveTextContent(
+      "aberto:1",
+    );
+  });
+});

app/components/showcase/ProjectList.tsx

@@ -0,0 +1,109 @@
+"use client";
+
+import Image from "next/image";
+import { type CSSProperties, useId, useRef } from "react";
+import { type Device, getShowcaseAssets } from "@/lib/project-showcase";
+import { BrowserFrame, displayUrl } from "./BrowserFrame";
+import { PhoneFrame } from "./PhoneFrame";
+import { ProjectActions } from "./ProjectActions";
+import { type ShowcaseItem, useShowcaseOpen } from "./ShowcaseProvider";
+import { useNearViewport } from "./useShowcaseMedia";
+
+function ListItem({
+  item,
+  device,
+  onExpand,
+}: {
+  item: ShowcaseItem;
+  /** `null` no servidor e até montar: o item mostra só o texto e os links. */
+  device: Device | null;
+  onExpand?: () => void;
+}) {
+  const { config, project } = item;
+  const ref = useRef<HTMLLIElement>(null);
+  const near = useNearViewport(ref);
+  const assets = device ? getShowcaseAssets(config.id, device) : null;
+  // só pôster (nunca vídeo): a imagem entra quando o item chega a ~1 tela da janela
+  const poster =
+    assets && near ? (
+      <Image
+        src={assets.poster}
+        alt={`Captura de tela de ${project.title}`}
+        width={assets.width}
+        height={assets.height}
+        sizes={device === "mobile" ? "(max-width: 767px) 70vw" : "50vw"}
+      />
+    ) : null;
+
+  return (
+    <li
+      ref={ref}
+      className="ds-reel-item"
+      data-device={device ?? undefined}
+      style={{ "--accent": config.accent } as CSSProperties}
+    >
+      {device && (
+        <div className="ds-reel-item-media">
+          {device === "mobile" ? (
+            <PhoneFrame className="ds-reel-item-phone">{poster}</PhoneFrame>
+          ) : (
+            <BrowserFrame url={displayUrl(project)}>
+              <div className="ds-reel-item-screen">{poster}</div>
+            </BrowserFrame>
+          )}
+        </div>
+      )}
+      <div className="ds-reel-caption">
+        <p className="ds-kicker">
+          {project.category} · {project.status}
+        </p>
+        <h3 className="ds-reel-title">{project.title}</h3>
+        {project.subtitle && <p className="ds-reel-sub">{project.subtitle}</p>}
+        <ProjectActions item={item} onExpand={onExpand} />
+      </div>
+    </li>
+  );
+}
+
+/**
+ * Projetos em lista simples: sem rolagem presa, sem vídeo que acompanha a rolagem. No celular (abaixo de 768 px)
+ * é um carrossel por toque (rolagem horizontal com encaixe, o próximo projeto aparece pela borda); em telas
+ * maiores, uma grade. Serve também a quem pede menos movimento e a janelas baixas demais para a vitrine fixa.
+ *
+ * É o que o servidor entrega (texto e links, sem mídia): sem JavaScript os projetos continuam todos ali, e
+ * `pending` esconde a lista por CSS só onde a vitrine fixa vai assumir o lugar (largura e altura de desktop).
+ * Pôster e "Ampliar vídeo" entram depois que o navegador monta; vídeo, só dentro da janela ampliada.
+ */
+export function ProjectList({
+  items,
+  device,
+  pending = false,
+}: {
+  items: ShowcaseItem[];
+  device: Device | null;
+  pending?: boolean;
+}) {
+  const open = useShowcaseOpen();
+  const headingId = useId();
+  return (
+    <section
+      className="ds-reel-list"
+      aria-labelledby={headingId}
+      data-pending={pending ? "" : undefined}
+    >
+      <h2 id={headingId} className="sr-only">
+        Projetos de clientes
+      </h2>
+      <ul className="ds-reel-items">
+        {items.map((item) => (
+          <ListItem
+            key={item.config.id}
+            item={item}
+            device={device}
+            onExpand={device ? () => open(item.config.id) : undefined}
+          />
+        ))}
+      </ul>
+    </section>
+  );
+}

app/components/showcase/ProjectMedia.test.tsx

@@ -1,4 +1,6 @@
 import { act, fireEvent, render, screen } from "@testing-library/react";
+import { renderToString } from "react-dom/server";
+import { MOBILE_QUERY } from "@/lib/device";
 import { getFeaturedProjects } from "@/lib/portfolio-data";
 import { ProjectMedia } from "./ProjectMedia";
 import { ShowcaseProvider } from "./ShowcaseProvider";
@@ -18,6 +20,16 @@ if (!nutriscan) throw new Error("projeto ausente");
 type Callback = IntersectionObserverCallback;
 const callbacks: Callback[] = [];
 const Original = global.IntersectionObserver;
+const originalMatchMedia = window.matchMedia;
+
+function mockPhone() {
+  window.matchMedia = jest.fn().mockImplementation((query: string) => ({
+    matches: query === MOBILE_QUERY,
+    media: query,
+    addEventListener() {},
+    removeEventListener() {},
+  }));
+}
 
 beforeEach(() => {
   jest.useFakeTimers();
@@ -43,6 +55,11 @@ afterEach(() => {
   jest.useRealTimers();
   jest.restoreAllMocks();
   global.IntersectionObserver = Original;
+  window.matchMedia = originalMatchMedia;
+  Object.defineProperty(navigator, "connection", {
+    configurable: true,
+    value: undefined,
+  });
 });
 
 function renderCard() {
@@ -156,6 +173,69 @@ describe("ProjectMedia", () => {
     ).toBeNull();
   });
 
+  it("sends no media at all in the server HTML: the device is only known in the browser", () => {
+    const html = renderToString(
+      <ShowcaseProvider projects={projects}>
+        <ProjectMedia project={nutriscan as NonNullable<typeof nutriscan>} />
+      </ShowcaseProvider>,
+    );
+    expect(html).toContain("ds-frame-screen");
+    expect(html).not.toContain("<video");
+    expect(html).not.toContain("/videos/");
+  });
+
+  it("asks for the poster only once the cover is within about a screen of the window", () => {
+    const { frame, container } = renderCard();
+    const screenElement = container.querySelector(
+      ".ds-frame-screen",
+    ) as HTMLElement;
+    const video = container.querySelector("video") as HTMLVideoElement;
+    expect(screenElement.style.backgroundImage).toBe("");
+    expect(video).not.toHaveAttribute("poster");
+    expect(video).toHaveAttribute("preload", "metadata");
+
+    show(frame);
+    expect(screenElement.style.backgroundImage).toContain(
+      "/videos/nutriscan/desktop.webp",
+    );
+    expect(video).toHaveAttribute("poster", "/videos/nutriscan/desktop.webp");
+  });
+
+  it("uses the phone version of the poster and the video below 768 px", () => {
+    mockPhone();
+    const { frame, container } = renderCard();
+    show(frame);
+
+    const screenElement = container.querySelector(
+      ".ds-frame-screen",
+    ) as HTMLElement;
+    expect(screenElement.style.backgroundImage).toContain(
+      "/videos/nutriscan/mobile.webp",
+    );
+    const sources = [...container.querySelectorAll("video source")].map(
+      (source) => source.getAttribute("src"),
+    );
+    expect(sources).toEqual([
+      "/videos/nutriscan/mobile.webm",
+      "/videos/nutriscan/mobile.mp4",
+    ]);
+  });
+
+  it("keeps the poster and never attaches a video when the data saver is on", () => {
+    Object.defineProperty(navigator, "connection", {
+      configurable: true,
+      value: { saveData: true },
+    });
+    const { frame, container } = renderCard();
+    show(frame);
+
+    expect(container.querySelector("video")).toBeNull();
+    expect(container.querySelector("source")).toBeNull();
+    expect(
+      screen.getByRole("img", { name: "Captura de tela de NutriScan" }),
+    ).toBeInTheDocument();
+  });
+
   it("renders nothing for a project without a recorded video", () => {
     const { container } = render(
       <ShowcaseProvider projects={projects}>

app/components/showcase/ProjectMedia.tsx

@@ -6,10 +6,13 @@ import { getProjectVideo, getShowcaseConfig } from "@/lib/project-showcase";
 import { ProjectVideo } from "../ProjectVideo";
 import { BrowserFrame, displayUrl } from "./BrowserFrame";
 import { useShowcaseCard } from "./ShowcaseProvider";
+import { useNearViewport, useViewportDevice } from "./useShowcaseMedia";
 
 /**
  * Capa do card com vídeo: o vídeo dentro de uma moldura de navegador, com brilho da cor do site quando é o
- * card que toca, e o botão que amplia (a tela inteira é o botão).
+ * card que toca, e o botão que amplia (a tela inteira é o botão). A versão do aparelho (celular abaixo de
+ * 768 px) só é escolhida no navegador; no servidor e antes de a capa chegar a ~1 tela da janela, nem o pôster
+ * é pedido (a moldura já reserva o espaço).
  */
 export function ProjectMedia({
   project,
@@ -18,15 +21,16 @@ export function ProjectMedia({
     id: string;
     title: string;
     demoUrl?: string | null;
-    githubUrl?: string | null;
   };
 }) {
   const { frameRef, active, open, userPaused, toggleAutoplay } =
     useShowcaseCard(project.id);
   const reducedMotion = useReducedMotion();
-  const video = getProjectVideo(project.id);
+  const device = useViewportDevice();
+  const near = useNearViewport(frameRef);
+  const video = device ? getProjectVideo(project.id, device) : undefined;
   const config = getShowcaseConfig(project.id);
-  if (!video || !config) return null;
+  if (!getProjectVideo(project.id) || !config) return null;
 
   return (
     <div
@@ -38,9 +42,20 @@ export function ProjectMedia({
       <BrowserFrame url={displayUrl(project)}>
         <div
           className="ds-frame-screen"
-          style={{ backgroundImage: `url(${video.poster})` }}
+          style={
+            video && near
+              ? { backgroundImage: `url(${video.poster})` }
+              : undefined
+          }
         >
-          <ProjectVideo video={video} title={project.title} active={active} />
+          {video && (
+            <ProjectVideo
+              video={video}
+              title={project.title}
+              active={active}
+              showPoster={near}
+            />
+          )}
           <button
             type="button"
             className="ds-frame-expand"

app/components/showcase/ProjectReel.paths.test.tsx

@@ -0,0 +1,675 @@
+import { act, fireEvent, render, screen, within } from "@testing-library/react";
+import { renderToString } from "react-dom/server";
+import { MOBILE_QUERY } from "@/lib/device";
+import { getFeaturedProjects } from "@/lib/portfolio-data";
+import { getShowcaseConfig } from "@/lib/project-showcase";
+import { ProjectReel } from "./ProjectReel";
+import { ShowcaseProvider } from "./ShowcaseProvider";
+import { reelOffset } from "./showcase-math";
+import { PINNED_QUERY } from "./useShowcaseMedia";
+
+/**
+ * Testes de caminhos-base de ProjectReel (complemento de ProjectReel.test.tsx):
+ * - qual versão da vitrine entra (fixa só com largura e altura de desktop e sem movimento reduzido; lista em
+ *   janela baixa; carrossel no celular; nada sem projetos) e a troca ao vivo quando a janela muda;
+ * - measure(): vitrine escondida por CSS, trilho sem rolagem;
+ * - a faixa de projetos que acompanha o ativo, a descarga de vídeos, o seek dos vídeos, o "prime" e a rolagem suave.
+ */
+
+let reducedMotion = false;
+jest.mock("@/app/hooks/useReducedMotion", () => ({
+  useReducedMotion: () => reducedMotion,
+}));
+
+const HEADER = 60;
+let containerHeight = 7000;
+let pinHeight = 800;
+let reelTop = HEADER;
+let phoneWidth = 90;
+/** Rolagem horizontal da faixa de projetos (tablet e celular). */
+let stripScrollWidth = 0;
+let stripClientWidth = 0;
+let buttonOffsetLeft = 0;
+let mediaNetworkState = 0;
+
+type Listener = () => void;
+const mediaState: Record<string, boolean> = {};
+const mediaListeners = new Map<string, Set<Listener>>();
+const originalMatchMedia = window.matchMedia;
+
+function mockViewport({
+  phone = false,
+  pinned = !phone,
+}: {
+  phone?: boolean;
+  pinned?: boolean;
+} = {}) {
+  mediaState[MOBILE_QUERY] = phone;
+  mediaState[PINNED_QUERY] = pinned;
+  mediaListeners.clear();
+  window.matchMedia = jest.fn().mockImplementation((query: string) => ({
+    get matches() {
+      return Boolean(mediaState[query]);
+    },
+    media: query,
+    addEventListener: (_type: string, listener: Listener) => {
+      if (!mediaListeners.has(query)) mediaListeners.set(query, new Set());
+      mediaListeners.get(query)?.add(listener);
+    },
+    removeEventListener: (_type: string, listener: Listener) => {
+      mediaListeners.get(query)?.delete(listener);
+    },
+  }));
+}
+
+function changeMedia(query: string, matches: boolean) {
+  mediaState[query] = matches;
+  act(() => {
+    for (const listener of mediaListeners.get(query) ?? []) listener();
+  });
+}
+
+const projects = getFeaturedProjects(null);
+const WEIGHTS = [
+  "sev-modaintima",
+  "lavacao-047",
+  "nutriscan",
+  "sc-plus",
+  "as-servicos",
+].map((id) => getShowcaseConfig(id)?.weight ?? 1);
+
+const originalRect = Element.prototype.getBoundingClientRect;
+const descriptors = {
+  offsetHeight: Object.getOwnPropertyDescriptor(
+    HTMLElement.prototype,
+    "offsetHeight",
+  ),
+  offsetWidth: Object.getOwnPropertyDescriptor(
+    HTMLElement.prototype,
+    "offsetWidth",
+  ),
+  offsetLeft: Object.getOwnPropertyDescriptor(
+    HTMLElement.prototype,
+    "offsetLeft",
+  ),
+  scrollWidth: Object.getOwnPropertyDescriptor(
+    Element.prototype,
+    "scrollWidth",
+  ),
+  clientWidth: Object.getOwnPropertyDescriptor(
+    Element.prototype,
+    "clientWidth",
+  ),
+  networkState: Object.getOwnPropertyDescriptor(
+    HTMLMediaElement.prototype,
+    "networkState",
+  ),
+};
+
+beforeAll(() => {
+  Object.defineProperty(HTMLElement.prototype, "offsetHeight", {
+    configurable: true,
+    get(this: HTMLElement) {
+      if (this.classList.contains("ds-reel")) return containerHeight;
+      if (this.classList.contains("ds-reel-pin")) return pinHeight;
+      return 0;
+    },
+  });
+  Object.defineProperty(HTMLElement.prototype, "offsetWidth", {
+    configurable: true,
+    get(this: HTMLElement) {
+      return this.classList.contains("ds-reel-phone") ? phoneWidth : 0;
+    },
+  });
+  Object.defineProperty(HTMLElement.prototype, "offsetLeft", {
+    configurable: true,
+    get(this: HTMLElement) {
+      return this.tagName === "BUTTON" ? buttonOffsetLeft : 0;
+    },
+  });
+  Object.defineProperty(Element.prototype, "scrollWidth", {
+    configurable: true,
+    get(this: Element) {
+      return this.matches(".ds-reel-index ol") ? stripScrollWidth : 0;
+    },
+  });
+  Object.defineProperty(Element.prototype, "clientWidth", {
+    configurable: true,
+    get(this: Element) {
+      return this.matches(".ds-reel-index ol") ? stripClientWidth : 0;
+    },
+  });
+  Object.defineProperty(HTMLMediaElement.prototype, "networkState", {
+    configurable: true,
+    get: () => mediaNetworkState,
+  });
+  HTMLDialogElement.prototype.showModal = function showModal(
+    this: HTMLDialogElement,
+  ) {
+    this.setAttribute("open", "");
+  };
+  HTMLDialogElement.prototype.close = function close(this: HTMLDialogElement) {
+    this.removeAttribute("open");
+    this.dispatchEvent(new Event("close"));
+  };
+  Element.prototype.getBoundingClientRect = function rect(this: Element) {
+    if (this.classList.contains("ds-reel"))
+      return {
+        top: reelTop,
+        bottom: reelTop + containerHeight,
+        height: containerHeight,
+        left: 0,
+        right: 1000,
+        width: 1000,
+        x: 0,
+        y: reelTop,
+      } as DOMRect;
+    return originalRect.call(this);
+  };
+  window.scrollTo = jest.fn();
+});
+
+afterAll(() => {
+  Element.prototype.getBoundingClientRect = originalRect;
+  for (const [key, target] of [
+    ["offsetHeight", HTMLElement.prototype],
+    ["offsetWidth", HTMLElement.prototype],
+    ["offsetLeft", HTMLElement.prototype],
+    ["scrollWidth", Element.prototype],
+    ["clientWidth", Element.prototype],
+    ["networkState", HTMLMediaElement.prototype],
+  ] as const) {
+    const original = descriptors[key];
+    if (original) Object.defineProperty(target, key, original);
+    else Reflect.deleteProperty(target, key);
+  }
+});
+
+beforeEach(() => {
+  jest.useFakeTimers();
+  reducedMotion = false;
+  containerHeight = 7000;
+  pinHeight = 800;
+  reelTop = HEADER;
+  phoneWidth = 90;
+  stripScrollWidth = 0;
+  stripClientWidth = 0;
+  buttonOffsetLeft = 0;
+  mediaNetworkState = 0;
+  mockViewport();
+  (window.scrollTo as jest.Mock).mockClear();
+  jest.spyOn(HTMLMediaElement.prototype, "play").mockResolvedValue();
+  jest.spyOn(HTMLMediaElement.prototype, "pause").mockImplementation(() => {});
+  jest.spyOn(HTMLMediaElement.prototype, "load").mockImplementation(() => {});
+});
+
+afterEach(() => {
+  jest.useRealTimers();
+  jest.restoreAllMocks();
+  window.matchMedia = originalMatchMedia;
+  Object.defineProperty(navigator, "connection", {
+    configurable: true,
+    value: undefined,
+  });
+});
+
+function renderReel(list = projects) {
+  const view = render(
+    <ShowcaseProvider projects={list}>
+      <ProjectReel />
+    </ShowcaseProvider>,
+  );
+  act(() => {
+    jest.advanceTimersByTime(50);
+  });
+  return view;
+}
+
+function scrollTo(progress: number) {
+  const scrollable = containerHeight - pinHeight;
+  reelTop = HEADER - progress * scrollable;
+  act(() => {
+    window.dispatchEvent(new Event("scroll"));
+    jest.advanceTimersByTime(1500);
+  });
+}
+
+const reelEl = () => document.querySelector(".ds-reel");
+const listEl = () =>
+  screen.queryByRole("region", { name: "Projetos de clientes" });
+const activeLayer = () =>
+  document.querySelector('.ds-reel-layer[data-state="active"]') as HTMLElement;
+
+describe("ProjectReel: qual versão entra", () => {
+  it("path: no projects in the showcase -> renders nothing at all", () => {
+    const { container } = renderReel([]);
+
+    expect(container).toBeEmptyDOMElement();
+  });
+
+  it("path: wide and tall window, motion allowed -> the pinned reel, not the list", () => {
+    renderReel();
+
+    expect(reelEl()).not.toBeNull();
+    expect(listEl()).toBeNull();
+  });
+
+  it("path: wide but short window (below 561 px of height) -> desktop list, nothing pinned", () => {
+    mockViewport({ phone: false, pinned: false });
+
+    renderReel();
+
+    expect(reelEl()).toBeNull();
+    const list = listEl() as HTMLElement;
+    expect(list).not.toBeNull();
+    expect(list.querySelectorAll("li[data-device='desktop']")).toHaveLength(5);
+    expect(list.querySelector(".ds-phone")).toBeNull();
+    expect(list).not.toHaveAttribute("data-pending");
+  });
+
+  it("path: phone -> carousel list with the phone version of every item", () => {
+    mockViewport({ phone: true });
+
+    renderReel();
+
+    expect(reelEl()).toBeNull();
+    expect(
+      (listEl() as HTMLElement).querySelectorAll("li[data-device='mobile']"),
+    ).toHaveLength(5);
+  });
+
+  it("path: phone width and reduced motion at once -> still the list", () => {
+    mockViewport({ phone: true });
+    reducedMotion = true;
+
+    renderReel();
+
+    expect(reelEl()).toBeNull();
+    expect(listEl()).not.toBeNull();
+  });
+
+  it("path: server render -> the list marked as pending plus the placeholder, with no media", () => {
+    const html = renderToString(
+      <ShowcaseProvider projects={projects}>
+        <ProjectReel />
+      </ShowcaseProvider>,
+    );
+
+    expect(html).toContain("data-pending");
+    expect(html).toContain("ds-reel-placeholder");
+    expect(html).not.toContain("<video");
+    expect(html).not.toContain("<img");
+    expect(html).not.toContain('data-device="');
+  });
+
+  it("path: the window shrinks below the pinned size -> the reel gives way to the list, and back", () => {
+    renderReel();
+    expect(reelEl()).not.toBeNull();
+
+    changeMedia(PINNED_QUERY, false);
+    expect(reelEl()).toBeNull();
+    expect(listEl()).not.toBeNull();
+
+    changeMedia(PINNED_QUERY, true);
+    expect(reelEl()).not.toBeNull();
+    expect(listEl()).toBeNull();
+  });
+
+  it("path: the window crosses the phone breakpoint while the list shows -> the list switches versions", () => {
+    mockViewport({ phone: false, pinned: false });
+    renderReel();
+    expect(
+      (listEl() as HTMLElement).querySelectorAll("li[data-device='desktop']"),
+    ).toHaveLength(5);
+
+    changeMedia(MOBILE_QUERY, true);
+
+    expect(
+      (listEl() as HTMLElement).querySelectorAll("li[data-device='mobile']"),
+    ).toHaveLength(5);
+  });
+});
+
+describe("ProjectReel: measure()", () => {
+  it("path: the reel is hidden by CSS (height 0) -> nothing is measured or downloaded (and it is when visible)", () => {
+    const attachedSources = () =>
+      [...document.querySelectorAll(".ds-reel-layer video")].filter((video) =>
+        video.getAttribute("src"),
+      );
+    containerHeight = 0;
+    const hidden = renderReel();
+    scrollTo(0.5);
+    expect(attachedSources()).toHaveLength(0);
+    hidden.unmount();
+
+    containerHeight = 7000;
+    renderReel();
+    scrollTo(0.5);
+    expect(attachedSources().length).toBeGreaterThan(0);
+  });
+
+  it("path: the pinned scene is as tall as the track (nothing to scroll) -> stays on the first project", () => {
+    containerHeight = pinHeight;
+    renderReel();
+
+    scrollTo(0.9);
+
+    expect(activeLayer()).toHaveTextContent("SEV Moda Íntima");
+  });
+
+  it("path: scrolled to a later project -> that project becomes the active layer", () => {
+    renderReel();
+
+    scrollTo(reelOffset(WEIGHTS, 3, 0.5));
+
+    expect(
+      document.querySelector('.ds-reel-index [aria-current="true"]'),
+    ).toHaveAttribute("aria-label", "SC Plus Aquicultura");
+  });
+});
+
+describe("ProjectReel: faixa de projetos que acompanha o ativo", () => {
+  it("path: strip wider than its box -> scrolls the active button into view (minus 16 px)", () => {
+    stripScrollWidth = 900;
+    stripClientWidth = 300;
+    buttonOffsetLeft = 140;
+    const scrollToStrip = jest.fn();
+    HTMLOListElement.prototype.scrollTo = scrollToStrip;
+    try {
+      renderReel();
+
+      expect(scrollToStrip).toHaveBeenCalledWith({
+        left: 124,
+        behavior: "smooth",
+      });
+    } finally {
+      Reflect.deleteProperty(HTMLOListElement.prototype, "scrollTo");
+    }
+  });
+
+  it("path: the active button sits near the start -> never scrolls to a negative position", () => {
+    stripScrollWidth = 900;
+    stripClientWidth = 300;
+    buttonOffsetLeft = 4;
+    const scrollToStrip = jest.fn();
+    HTMLOListElement.prototype.scrollTo = scrollToStrip;
+    try {
+      renderReel();
+
+      expect(scrollToStrip).toHaveBeenCalledWith({
+        left: 0,
+        behavior: "smooth",
+      });
+    } finally {
+      Reflect.deleteProperty(HTMLOListElement.prototype, "scrollTo");
+    }
+  });
+
+  it("path: strip fits in its box -> no scrolling", () => {
+    stripScrollWidth = 300;
+    stripClientWidth = 300;
+    const scrollToStrip = jest.fn();
+    HTMLOListElement.prototype.scrollTo = scrollToStrip;
+    try {
+      renderReel();
+
+      expect(scrollToStrip).not.toHaveBeenCalled();
+    } finally {
+      Reflect.deleteProperty(HTMLOListElement.prototype, "scrollTo");
+    }
+  });
+
+  it("path: the browser has no Element.scrollTo -> no error and no scrolling", () => {
+    stripScrollWidth = 900;
+    stripClientWidth = 300;
+
+    expect(() => renderReel()).not.toThrow();
+  });
+});
+
+describe("ProjectReel: vídeos", () => {
+  const videos = () => [
+    ...document.querySelectorAll<HTMLVideoElement>(".ds-reel-layer video"),
+  ];
+
+  function ready(
+    video: HTMLVideoElement,
+    { readyState = 4, duration = 30, seeking = false } = {},
+  ) {
+    Object.defineProperty(video, "readyState", {
+      configurable: true,
+      value: readyState,
+    });
+    Object.defineProperty(video, "duration", {
+      configurable: true,
+      value: duration,
+    });
+    Object.defineProperty(video, "seeking", {
+      configurable: true,
+      value: seeking,
+    });
+    let time = 0;
+    Object.defineProperty(video, "currentTime", {
+      configurable: true,
+      get: () => time,
+      set: (value: number) => {
+        time = value;
+      },
+    });
+  }
+
+  it("path: videos that hold a file reference but are not attached -> released with load()", () => {
+    mediaNetworkState = 1;
+    reelTop = 6000; // longe da vitrine: ninguém fica anexado
+
+    renderReel();
+
+    expect(HTMLMediaElement.prototype.load).toHaveBeenCalled();
+  });
+
+  it("path: videos that never loaded anything (network empty) -> nothing to release", () => {
+    mediaNetworkState = 0;
+    reelTop = 6000;
+
+    renderReel();
+
+    expect(HTMLMediaElement.prototype.load).not.toHaveBeenCalled();
+  });
+
+  it("path: the attached project keeps its file while the others are released", () => {
+    mediaNetworkState = 1;
+    renderReel();
+    scrollTo(0);
+    jest.mocked(HTMLMediaElement.prototype.load).mockClear();
+    act(() => {
+      jest.advanceTimersByTime(400);
+    });
+
+    const attached = videos().filter((video) => video.getAttribute("src"));
+    expect(attached.length).toBeGreaterThan(0);
+    // quem soltou foi pedido a recarregar; quem ficou com src não foi tocado
+    const loaded = jest.mocked(HTMLMediaElement.prototype.load).mock
+      .instances as unknown as HTMLMediaElement[];
+    for (const video of attached) expect(loaded).not.toContain(video);
+  });
+
+  it("path: a video that is still seeking -> its time is left alone", () => {
+    renderReel();
+    for (const video of videos()) ready(video, { seeking: true });
+
+    scrollTo(reelOffset(WEIGHTS, 0, 0.5));
+
+    expect(videos()[0].currentTime).toBe(0);
+  });
+
+  it("path: a video whose metadata has not loaded (readyState 0) or has no duration -> never sought", () => {
+    renderReel();
+    const [first, second] = videos();
+    ready(first, { readyState: 0 });
+    ready(second, { duration: 0 });
+
+    scrollTo(reelOffset(WEIGHTS, 0, 0.5));
+
+    expect(first.currentTime).toBe(0);
+    expect(second.currentTime).toBe(0);
+  });
+
+  it("path: a video that is ready and idle -> sought to the scroll position", () => {
+    renderReel();
+    for (const video of videos()) ready(video);
+
+    scrollTo(reelOffset(WEIGHTS, 0, 0.5));
+
+    expect(videos()[0].currentTime).toBeGreaterThan(0);
+  });
+
+  it("path: first frame decoded -> primed once (play then pause) even if loadeddata fires twice", async () => {
+    renderReel();
+    const video = videos()[0];
+
+    fireEvent(video, new Event("loadeddata"));
+    fireEvent(video, new Event("loadeddata"));
+    await act(async () => {
+      await Promise.resolve();
+    });
+
+    expect(HTMLMediaElement.prototype.play).toHaveBeenCalledTimes(1);
+    expect(HTMLMediaElement.prototype.pause).toHaveBeenCalledTimes(1);
+    expect(video.dataset.primed).toBe("true");
+  });
+
+  it("path: priming is refused by the browser -> swallowed, no pause", async () => {
+    jest
+      .mocked(HTMLMediaElement.prototype.play)
+      .mockRejectedValue(new DOMException("blocked", "NotAllowedError"));
+    renderReel();
+
+    fireEvent(videos()[0], new Event("loadeddata"));
+    await act(async () => {
+      await Promise.resolve();
+    });
+
+    expect(HTMLMediaElement.prototype.pause).not.toHaveBeenCalled();
+  });
+
+  it("path: metadata loads before any scroll work (reel hidden by CSS, nothing measured) -> sought to the start, no error", () => {
+    containerHeight = 0;
+    renderReel();
+    const video = videos()[0];
+    ready(video);
+
+    expect(() => fireEvent(video, new Event("loadedmetadata"))).not.toThrow();
+
+    expect(video.currentTime).toBe(0);
+  });
+
+  it("path: metadata loads when the scroll target is known but no frame ran yet (reel far away) -> uses the target", () => {
+    reelTop = 6000;
+    renderReel();
+    const video = videos()[0];
+    ready(video);
+
+    fireEvent(video, new Event("loadedmetadata"));
+
+    expect(video.currentTime).toBe(0);
+  });
+
+  it("path: metadata loads after the scroll already moved -> the video jumps to where the scroll is", () => {
+    renderReel();
+    scrollTo(reelOffset(WEIGHTS, 0, 0.5));
+    const video = videos()[0];
+    ready(video);
+
+    fireEvent(video, new Event("loadedmetadata"));
+
+    expect(video.currentTime).toBeGreaterThan(0);
+  });
+});
+
+describe("ProjectReel: rolagem suave até um projeto", () => {
+  function pressProject(name: string) {
+    fireEvent.click(
+      within(
+        screen.getByRole("navigation", { name: "Projetos da vitrine" }),
+      ).getByRole("button", { name }),
+    );
+  }
+
+  it("path: pressing a project -> scrolls in animation frames and ends exactly on the target", () => {
+    renderReel();
+
+    pressProject("SC Plus Aquicultura");
+    act(() => {
+      jest.advanceTimersByTime(2000);
+    });
+
+    const calls = (window.scrollTo as jest.Mock).mock.calls;
+    expect(calls.length).toBeGreaterThan(2);
+    for (const [options] of calls) expect(options.behavior).toBe("instant");
+    const tops = calls.map(([options]) => options.top as number);
+    expect(tops).toEqual([...tops].sort((a, b) => a - b));
+    expect(tops[tops.length - 1]).toBeGreaterThan(tops[0]);
+  });
+
+  it("path: the wheel during the scroll -> the animation stops where it is", () => {
+    renderReel();
+    pressProject("SC Plus Aquicultura");
+    act(() => {
+      jest.advanceTimersByTime(100);
+    });
+
+    act(() => {
+      window.dispatchEvent(new Event("wheel"));
+    });
+    const stoppedAt = (window.scrollTo as jest.Mock).mock.calls.length;
+    act(() => {
+      jest.advanceTimersByTime(2000);
+    });
+
+    expect((window.scrollTo as jest.Mock).mock.calls).toHaveLength(stoppedAt);
+  });
+
+  it("path: touching the screen during the scroll -> the animation stops too", () => {
+    renderReel();
+    pressProject("SC Plus Aquicultura");
+    act(() => {
+      jest.advanceTimersByTime(100);
+    });
+
+    act(() => {
+      window.dispatchEvent(new Event("touchstart"));
+    });
+    const stoppedAt = (window.scrollTo as jest.Mock).mock.calls.length;
+    act(() => {
+      jest.advanceTimersByTime(2000);
+    });
+
+    expect((window.scrollTo as jest.Mock).mock.calls).toHaveLength(stoppedAt);
+  });
+
+  it("path: a second press while the first scroll runs -> the first is cancelled, only the new target is reached", () => {
+    renderReel();
+    pressProject("AS Serviços");
+    act(() => {
+      jest.advanceTimersByTime(100);
+    });
+    (window.scrollTo as jest.Mock).mockClear();
+
+    pressProject("Lavação 047");
+    act(() => {
+      jest.advanceTimersByTime(2000);
+    });
+
+    const tops = (window.scrollTo as jest.Mock).mock.calls.map(
+      ([options]) => options.top as number,
+    );
+    const finalTop = tops[tops.length - 1];
+    // o destino da Lavação (2º projeto) fica bem antes do da AS Serviços (último)
+    expect(finalTop).toBeLessThan(reelTopFor(4));
+  });
+
+  function reelTopFor(index: number) {
+    const scrollable = containerHeight - pinHeight;
+    return reelOffset(WEIGHTS, index, 0) * scrollable;
+  }
+});

app/components/showcase/ProjectReel.test.tsx

@@ -1,10 +1,12 @@
 import { act, fireEvent, render, screen, within } from "@testing-library/react";
 import { renderToString } from "react-dom/server";
+import { MOBILE_QUERY } from "@/lib/device";
 import { getFeaturedProjects } from "@/lib/portfolio-data";
 import { getShowcaseConfig, mobileFractionAt } from "@/lib/project-showcase";
 import { ProjectReel } from "./ProjectReel";
 import { ShowcaseProvider } from "./ShowcaseProvider";
 import { reelOffset, videoProgress } from "./showcase-math";
+import { PINNED_QUERY } from "./useShowcaseMedia";
 
 let reducedMotion = false;
 jest.mock("@/app/hooks/useReducedMotion", () => ({
@@ -16,6 +18,21 @@ const CONTAINER = 7000;
 const SCROLLABLE = CONTAINER - PIN;
 const HEADER = 60;
 let reelTop = HEADER;
+/** largura do celular da moldura: 0 simula uma moldura escondida por CSS */
+let phoneWidth = 90;
+
+const originalMatchMedia = window.matchMedia;
+
+/** Tela de desktop por padrão (cabe a vitrine fixa); `phone` simula um celular. */
+function mockViewport({ phone = false }: { phone?: boolean } = {}) {
+  window.matchMedia = jest.fn().mockImplementation((query: string) => ({
+    matches:
+      (query === MOBILE_QUERY && phone) || (query === PINNED_QUERY && !phone),
+    media: query,
+    addEventListener() {},
+    removeEventListener() {},
+  }));
+}
 
 const projects = getFeaturedProjects(null);
 const weights = [
@@ -31,6 +48,10 @@ const originalOffsetHeight = Object.getOwnPropertyDescriptor(
   HTMLElement.prototype,
   "offsetHeight",
 );
+const originalOffsetWidth = Object.getOwnPropertyDescriptor(
+  HTMLElement.prototype,
+  "offsetWidth",
+);
 
 beforeAll(() => {
   Object.defineProperty(HTMLElement.prototype, "offsetHeight", {
@@ -41,6 +62,22 @@ beforeAll(() => {
       return 0;
     },
   });
+  Object.defineProperty(HTMLElement.prototype, "offsetWidth", {
+    configurable: true,
+    get(this: HTMLElement) {
+      return this.classList.contains("ds-reel-phone") ? phoneWidth : 0;
+    },
+  });
+  // jsdom ainda não implementa o <dialog> modal
+  HTMLDialogElement.prototype.showModal = function showModal(
+    this: HTMLDialogElement,
+  ) {
+    this.setAttribute("open", "");
+  };
+  HTMLDialogElement.prototype.close = function close(this: HTMLDialogElement) {
+    this.removeAttribute("open");
+    this.dispatchEvent(new Event("close"));
+  };
   Element.prototype.getBoundingClientRect = function rect(this: Element) {
     if (this.classList.contains("ds-reel"))
       return {
@@ -66,12 +103,20 @@ afterAll(() => {
       "offsetHeight",
       originalOffsetHeight,
     );
+  if (originalOffsetWidth)
+    Object.defineProperty(
+      HTMLElement.prototype,
+      "offsetWidth",
+      originalOffsetWidth,
+    );
 });
 
 beforeEach(() => {
   jest.useFakeTimers();
   reducedMotion = false;
   reelTop = HEADER;
+  phoneWidth = 90;
+  mockViewport();
   (window.scrollTo as jest.Mock).mockClear();
   jest.spyOn(HTMLMediaElement.prototype, "play").mockResolvedValue();
   jest.spyOn(HTMLMediaElement.prototype, "pause").mockImplementation(() => {});
@@ -80,6 +125,11 @@ beforeEach(() => {
 afterEach(() => {
   jest.useRealTimers();
   jest.restoreAllMocks();
+  window.matchMedia = originalMatchMedia;
+  Object.defineProperty(navigator, "connection", {
+    configurable: true,
+    value: undefined,
+  });
 });
 
 function renderReel() {
@@ -130,12 +180,51 @@ const activeLayer = () =>
   document.querySelector('.ds-reel-layer[data-state="active"]') as HTMLElement;
 
 describe("ProjectReel", () => {
-  it("renders nothing for users who prefer reduced motion", () => {
+  it("falls back to a plain project list, nothing pinned, for users who prefer reduced motion", () => {
     reducedMotion = true;
     renderReel();
     expect(
       screen.queryByRole("region", { name: /Vitrine animada/ }),
     ).toBeNull();
+    expect(document.querySelector(".ds-reel")).toBeNull();
+    const list = screen.getByRole("region", { name: "Projetos de clientes" });
+    expect(within(list).getAllByRole("heading", { level: 3 })).toHaveLength(5);
+    expect(document.querySelector("video")).toBeNull();
+  });
+
+  it("is a touch carousel of posters, with nothing pinned and no video, on a phone", () => {
+    mockViewport({ phone: true });
+    renderReel();
+
+    expect(document.querySelector(".ds-reel")).toBeNull();
+    const list = screen.getByRole("region", { name: "Projetos de clientes" });
+    expect(list).not.toHaveAttribute("data-pending");
+    expect(document.querySelector("video")).toBeNull();
+    // o item chega a ~1 tela da janela (o IntersectionObserver do jest.setup avisa): só então vem o pôster
+    act(() => {
+      jest.advanceTimersByTime(50);
+    });
+    const posters = [...list.querySelectorAll("img")].map((image) =>
+      decodeURIComponent(image.getAttribute("src") ?? ""),
+    );
+    expect(posters.length).toBeGreaterThan(0);
+    for (const poster of posters) expect(poster).toContain("mobile.webp");
+    expect(list.querySelectorAll(".ds-phone")).toHaveLength(5);
+    expect(list.querySelector(".ds-bframe")).toBeNull();
+  });
+
+  it("still opens the enlarged video from the list, without any card in the page", () => {
+    mockViewport({ phone: true });
+    renderReel();
+    const item = screen
+      .getByRole("heading", { level: 3, name: "SEV Moda Íntima" })
+      .closest("li") as HTMLElement;
+    fireEvent.click(
+      within(item).getByRole("button", { name: /Ampliar vídeo/ }),
+    );
+    expect(
+      screen.getByRole("dialog", { name: "SEV Moda Íntima" }),
+    ).toBeInTheDocument();
   });
 
   it("lists every project by name, starting on the first with its chapters", () => {
@@ -201,7 +290,7 @@ describe("ProjectReel", () => {
     const lavacao = getShowcaseConfig("lavacao-047");
     expect(lavacao).toBeDefined();
     expect(layer.querySelector(".ds-reel-chapter-count")?.textContent).toMatch(
-      /^0\d\/06$/,
+      /^0\d\/03$/,
     );
     const labels = lavacao?.chapters.map((chapter) => chapter.label) ?? [];
     expect(labels).toContain(
@@ -237,7 +326,7 @@ describe("ProjectReel", () => {
     expect(sources().every((src) => src === null)).toBe(true);
   });
 
-  it("downloads only the project on screen and its neighbours, and lets go of the rest", () => {
+  it("downloads video only for the project on screen (neighbours stay on the poster), and lets go of the rest", () => {
     renderReel();
     scrollTo(0);
     act(() => {
@@ -248,10 +337,14 @@ describe("ProjectReel", () => {
       loaded.some((src) => src?.includes("sev-modaintima/scrub-desktop.mp4")),
     ).toBe(true);
     expect(
-      loaded.some((src) => src?.includes("lavacao-047/scrub-mobile.mp4")),
+      loaded.some((src) => src?.includes("sev-modaintima/scrub-mobile.mp4")),
     ).toBe(true);
+    // o vizinho (Lavação) e os demais ficam sem nenhum vídeo
+    expect(loaded.some((src) => src?.includes("lavacao-047"))).toBe(false);
     expect(loaded.some((src) => src?.includes("nutriscan"))).toBe(false);
     expect(loaded.some((src) => src?.includes("as-servicos"))).toBe(false);
+    for (const video of document.querySelectorAll(".ds-reel-layer video"))
+      expect(video).toHaveAttribute("preload", "metadata");
 
     // vai para o último projeto: o primeiro sai da janela e solta o arquivo
     scrollTo(1);
@@ -281,34 +374,38 @@ describe("ProjectReel", () => {
     });
     const loaded = sources().filter(Boolean);
     expect(loaded.some((src) => src?.includes("sc-plus"))).toBe(true);
-    expect(loaded.some((src) => src?.includes("nutriscan"))).toBe(true); // vizinho do projeto onde parou
+    expect(loaded.some((src) => src?.includes("nutriscan"))).toBe(false); // vizinho: só o pôster
     expect(loaded.some((src) => src?.includes("sev-modaintima"))).toBe(false);
   });
 
-  it("does not download the hidden laptop video on a phone-sized screen", () => {
-    const original = window.matchMedia;
-    window.matchMedia = jest.fn().mockImplementation((query: string) => ({
-      matches: query.includes("max-width: 639px"),
-      media: query,
-      addEventListener() {},
-      removeEventListener() {},
-    }));
-    try {
-      renderReel();
-      scrollTo(0);
-      act(() => {
-        jest.advanceTimersByTime(400);
-      });
-      const loaded = sources().filter(Boolean);
-      expect(loaded.some((src) => src?.includes("scrub-mobile.mp4"))).toBe(
-        true,
-      );
-      expect(loaded.some((src) => src?.includes("scrub-desktop.mp4"))).toBe(
-        false,
-      );
-    } finally {
-      window.matchMedia = original;
-    }
+  it("does not download the phone video while the phone frame is not on screen", () => {
+    phoneWidth = 0;
+    renderReel();
+    scrollTo(0);
+    act(() => {
+      jest.advanceTimersByTime(400);
+    });
+    const loaded = sources().filter(Boolean);
+    expect(
+      loaded.some((src) => src?.includes("sev-modaintima/scrub-desktop.mp4")),
+    ).toBe(true);
+    expect(loaded.some((src) => src?.includes("scrub-mobile.mp4"))).toBe(false);
+  });
+
+  it("asks for posters only near the reel, and only for the project on screen and its neighbours", () => {
+    reelTop = 6000;
+    renderReel();
+    const background = (index: number) =>
+      (document.querySelectorAll(".ds-reel-screen")[index] as HTMLElement).style
+        .backgroundImage;
+    expect(background(0)).toBe("");
+    expect(document.querySelectorAll("video[poster]")).toHaveLength(0);
+
+    scrollTo(0); // chegou a menos de uma tela
+    expect(background(0)).toContain("sev-modaintima/desktop.webp");
+    expect(background(1)).toContain("lavacao-047/desktop.webp");
+    expect(background(3)).toBe("");
+    expect(background(4)).toBe("");
   });
 
   it("respects the data saver: no scroll video is downloaded", () => {
@@ -316,31 +413,113 @@ describe("ProjectReel", () => {
       configurable: true,
       value: { saveData: true },
     });
-    try {
-      renderReel();
-      scrollTo(0);
-      act(() => {
-        jest.advanceTimersByTime(400);
-      });
-      expect(sources().every((src) => src === null)).toBe(true);
-    } finally {
-      Object.defineProperty(navigator, "connection", {
-        configurable: true,
-        value: undefined,
-      });
-    }
+    renderReel();
+    scrollTo(0);
+    act(() => {
+      jest.advanceTimersByTime(400);
+    });
+    expect(sources().every((src) => src === null)).toBe(true);
+    // o pôster continua lá
+    expect(
+      (document.querySelectorAll(".ds-reel-screen")[0] as HTMLElement).style
+        .backgroundImage,
+    ).toContain("desktop.webp");
   });
 
-  it("holds the page height before it mounts, so a jump to #contact lands in the right place", () => {
+  it("gives the server the project list (text and links, no media) and holds the pinned height before mounting", () => {
     const html = renderToString(
       <ShowcaseProvider projects={projects}>
         <ProjectReel />
       </ShowcaseProvider>,
     );
+    // lugar reservado para a vitrine fixa: a página não muda de altura quando ela aparece (salto para #contact)
     expect(html).toContain("ds-reel-placeholder");
     expect(html).toContain("--reel-sum");
     expect(html).toContain('aria-hidden="true"');
     expect(html).not.toContain("<video");
+    expect(html).not.toContain("/videos/");
+    // sem JavaScript os projetos continuam ali, com o link do case
+    expect(html).toContain("ds-reel-list");
+    expect(html).toContain("data-pending");
+    expect(html).toContain("SEV Moda Íntima");
+    expect(html).toContain('href="/cases/lavacao-047"');
+    expect(html).not.toContain("Ampliar vídeo");
+  });
+
+  it("has an h2 before the project h3, in the pinned scene and in the list", () => {
+    const { unmount } = renderReel();
+    const region = screen.getByRole("region", { name: /Vitrine animada/ });
+    const order = [...region.querySelectorAll("h2, h3")].map(
+      (heading) => heading.tagName,
+    );
+    expect(order[0]).toBe("H2");
+    expect(order).toContain("H3");
+    unmount();
+
+    mockViewport({ phone: true });
+    renderReel();
+    const list = screen.getByRole("region", { name: "Projetos de clientes" });
+    expect(list.querySelector("h2, h3")?.tagName).toBe("H2");
+  });
+
+  it("limits each project to three chapters, in the index and in the caption", () => {
+    renderReel();
+    for (const layer of document.querySelectorAll(".ds-reel-layer"))
+      expect(
+        layer.querySelectorAll(".ds-reel-ticks li").length,
+      ).toBeLessThanOrEqual(3);
+    const chapters = screen.getByRole("list", {
+      name: "Trechos de SEV Moda Íntima",
+    });
+    expect(within(chapters).getAllByRole("button")).toHaveLength(3);
+  });
+
+  it("shows the real domain in the address bar, or just the project name, never github.com", () => {
+    renderReel();
+    const bars = [...document.querySelectorAll(".ds-bframe-url")].map(
+      (bar) => bar.textContent,
+    );
+    expect(bars).toContain("sevmodaintima.com.br");
+    expect(bars).toContain("scplus.evandro.dev.br");
+    expect(bars).toContain("AS Serviços");
+    expect(document.body.innerHTML).not.toContain("github.com");
+  });
+
+  it("offers Ver case (outline), Abrir site (text link, only with a live site) and Ampliar vídeo, none of them lime", () => {
+    renderReel();
+    const layer = activeLayer();
+    const actions = layer.querySelector(".ds-reel-actions") as HTMLElement;
+    expect(
+      within(actions).getByRole("link", { name: /Ver case/ }),
+    ).toHaveAttribute("href", "/cases/sev-modaintima");
+    const site = within(actions).getByRole("link", { name: /Abrir site/ });
+    expect(site).toHaveAttribute("href", "https://sevmodaintima.com.br");
+    expect(site).toHaveAttribute("target", "_blank");
+    expect(site).toHaveClass("ds-link-text");
+    expect(
+      within(actions).getByRole("button", { name: /Ampliar vídeo/ }),
+    ).toHaveClass("ds-link-muted");
+    expect(document.querySelector(".ds-reel .ds-link-accent")).toBeNull();
+
+    // sem demoUrl não há "Abrir site"
+    const asServicos = [...document.querySelectorAll(".ds-reel-layer")].at(-1);
+    expect(asServicos).toBeDefined();
+    expect(
+      within(asServicos as HTMLElement).queryByRole("link", {
+        name: /Abrir site/,
+        hidden: true,
+      }),
+    ).toBeNull();
+  });
+
+  it("opens the enlarged video from the pinned scene", () => {
+    renderReel();
+    fireEvent.click(
+      within(activeLayer()).getByRole("button", { name: /Ampliar vídeo/ }),
+    );
+    expect(
+      screen.getByRole("dialog", { name: "SEV Moda Íntima" }),
+    ).toBeInTheDocument();
   });
 
   it("scrolls to the start of a project when its button is pressed", () => {

app/components/showcase/ProjectReel.tsx

@@ -18,7 +18,13 @@ import {
 } from "@/lib/project-showcase";
 import { BrowserFrame, displayUrl } from "./BrowserFrame";
 import { PhoneFrame } from "./PhoneFrame";
-import { useShowcaseItems, useShowcaseOpen } from "./ShowcaseProvider";
+import { ProjectActions } from "./ProjectActions";
+import { ProjectList } from "./ProjectList";
+import {
+  type ShowcaseItem,
+  useShowcaseItems,
+  useShowcaseOpen,
+} from "./ShowcaseProvider";
 import {
   easeToward,
   locateInReel,
@@ -26,6 +32,11 @@ import {
   reelOffset,
   videoProgress,
 } from "./showcase-math";
+import {
+  usePinnedViewport,
+  useSaveData,
+  useViewportDevice,
+} from "./useShowcaseMedia";
 
 // a altura do cabeçalho só muda com a largura da janela (tokens em :root): ler o estilo a cada quadro de rolagem é caro
 let headerCache = { width: -1, height: 60 };
@@ -43,25 +54,6 @@ const headerHeight = () => {
   return headerCache.height;
 };
 
-/** Verdadeiro enquanto a tela é estreita a ponto de a vitrine mostrar só o celular (o notebook fica escondido). */
-function usePhoneOnly() {
-  const [phoneOnly, setPhoneOnly] = useState(false);
-  useEffect(() => {
-    if (typeof window.matchMedia !== "function") return;
-    const query = window.matchMedia("(max-width: 639px)");
-    const update = () => setPhoneOnly(query.matches);
-    update();
-    query.addEventListener("change", update);
-    return () => query.removeEventListener("change", update);
-  }, []);
-  return phoneOnly;
-}
-
-/** "Economizar dados" ligado: a vitrine fica nos posters, sem baixar os vídeos de rolagem. */
-const saveDataOn = () =>
-  (navigator as Navigator & { connection?: { saveData?: boolean } }).connection
-    ?.saveData === true;
-
 /** Põe o vídeo no instante `fraction` (0 a 1) sem repetir buscas enquanto a anterior ainda não terminou. */
 function seekVideo(video: HTMLVideoElement | null, fraction: number) {
   if (!video || video.readyState < 1 || !video.duration) return;
@@ -111,25 +103,68 @@ function scrollToSmoothly(top: number) {
   id = requestAnimationFrame(step);
 }
 
+/**
+ * Projetos da home. Em tablet e desktop (768 px de largura e 561 px de altura, no mínimo), a vitrine animada:
+ * o site de cada projeto rola dentro de um notebook (e de um celular ao lado) conforme a página rola, com a
+ * cena presa (position: sticky) durante a rolagem de todos os projetos. No celular, com prefers-reduced-motion
+ * e em janelas baixas, nada fica preso: é a lista de projetos (carrossel por toque no celular), só com pôsteres.
+ * O servidor entrega a lista (texto e links); o navegador troca pela vitrine fixa quando ela cabe, e até lá
+ * um bloco da mesma altura segura o lugar dela. Funciona sozinha dentro de `ShowcaseProvider`: não depende
+ * dos cards da grade.
+ */
+export function ProjectReel() {
+  const items = useShowcaseItems();
+  const reducedMotion = useReducedMotion();
+  const wide = usePinnedViewport();
+  const device = useViewportDevice();
+
+  if (items.length === 0) return null;
+
+  const mounted = wide !== null && device !== null;
+  if (mounted && wide && !reducedMotion) return <PinnedReel items={items} />;
+
+  return (
+    <>
+      <ProjectList items={items} device={device} pending={!mounted} />
+      {!mounted && (
+        // antes de montar, um bloco da mesma altura segura o lugar da vitrine fixa: a página não muda de
+        // tamanho quando ela aparece (o salto para #contact, por exemplo, cai no lugar certo); o CSS só o
+        // mostra onde a vitrine fixa vai existir (e a lista, nesses casos, fica escondida)
+        <div
+          className="ds-reel ds-reel-placeholder"
+          aria-hidden="true"
+          style={
+            {
+              "--reel-sum": items.reduce(
+                (sum, item) => sum + item.config.weight,
+                0,
+              ),
+            } as CSSProperties
+          }
+        />
+      )}
+    </>
+  );
+}
+
 /**
  * Vitrine animada: o site de cada projeto rola dentro de um notebook (e de um celular ao lado) conforme a
  * página rola. A cena fica presa (position: sticky) durante a rolagem de todos os projetos; cada projeto tem
  * um trecho com uma pausa no começo e outra no fim. Capítulos nomeiam o que está na tela; notebook e celular
  * mostram o mesmo trecho do site ao mesmo tempo.
  *
- * Só existe com JavaScript e sem prefers-reduced-motion; antes disso, e nesses casos, os cards fazem o papel.
+ * Mídia: só o projeto em cena baixa vídeo (os vizinhos ficam no pôster), e só quando a vitrine está a ~1 tela
+ * da janela; com "economizar dados" ninguém baixa vídeo. O vídeo de celular só é pedido se a moldura do
+ * celular está à vista.
  */
-export function ProjectReel() {
-  const items = useShowcaseItems();
+function PinnedReel({ items }: { items: ShowcaseItem[] }) {
   const openProject = useShowcaseOpen();
-  const reducedMotion = useReducedMotion();
-  const [mounted, setMounted] = useState(false);
   const [active, setActive] = useState(0);
   const [chapter, setChapter] = useState(0);
   const [near, setNear] = useState(false);
   const [settled, setSettled] = useState(0);
-  const [saveData, setSaveData] = useState(false);
-  const phoneOnly = usePhoneOnly();
+  const [phoneVisible, setPhoneVisible] = useState(true);
+  const saveData = useSaveData();
 
   const containerRef = useRef<HTMLDivElement>(null);
   const pinRef = useRef<HTMLDivElement>(null);
@@ -145,6 +180,7 @@ export function ProjectReel() {
     raf: 0,
     last: 0,
     near: false,
+    phone: true,
   });
 
   const weights = useMemo(
@@ -153,13 +189,8 @@ export function ProjectReel() {
   );
   const weightSum = weights.reduce((sum, weight) => sum + weight, 0);
 
-  useEffect(() => {
-    setSaveData(saveDataOn());
-    setMounted(true);
-  }, []);
-
-  // só o projeto em cena e os vizinhos baixam vídeo; e só depois que a rolagem parou ali (passar voando por
-  // um projeto no clique do índice não pode baixar todos os do caminho)
+  // só o projeto em cena baixa vídeo (os vizinhos ficam no pôster); e só depois que a rolagem parou ali (passar
+  // voando por um projeto no clique do índice não pode baixar todos os do caminho)
   useEffect(() => {
     const timer = setTimeout(() => setSettled(active), 300);
     return () => clearTimeout(timer);
@@ -183,9 +214,11 @@ export function ProjectReel() {
   }, [active]);
 
   const isAttached = useCallback(
-    (index: number) => near && !saveData && Math.abs(index - settled) <= 1,
+    (index: number) => near && !saveData && index === settled,
     [near, saveData, settled],
   );
+  // o pôster de quem está em cena e dos vizinhos já fica pronto para a troca; os outros esperam chegar perto
+  const showsPoster = (index: number) => near && Math.abs(index - active) <= 1;
 
   // quem saiu da janela solta o arquivo (sem `src` o elemento fica vazio e libera a memória)
   useEffect(() => {
@@ -266,12 +299,20 @@ export function ProjectReel() {
     state.target = items.map((_, i) =>
       i < index ? 1 : i === index ? videoProgress(local) : 0,
     );
+    // a ~1 tela de distância (acima ou abaixo): é quando pôsteres e vídeo da vitrine começam a ser pedidos
     const near =
-      rect.top < window.innerHeight * 2 && rect.bottom > -window.innerHeight;
+      rect.top < window.innerHeight && rect.bottom > -window.innerHeight;
     if (near !== state.near) {
       state.near = near;
       setNear(near);
     }
+    // o celular da moldura só baixa vídeo se está à vista (tem tamanho na tela)
+    const phone = container.querySelector<HTMLElement>(".ds-reel-phone");
+    const phoneShown = Boolean(phone && phone.offsetWidth > 0);
+    if (phoneShown !== state.phone) {
+      state.phone = phoneShown;
+      setPhoneVisible(phoneShown);
+    }
 
     if (index !== state.active) {
       state.active = index;
@@ -289,7 +330,6 @@ export function ProjectReel() {
   }, [frame, items, weights]);
 
   useEffect(() => {
-    if (!mounted || reducedMotion || items.length === 0) return;
     let pending = 0;
     const schedule = () => {
       if (!pending)
@@ -309,7 +349,7 @@ export function ProjectReel() {
       cancelAnimationFrame(state.raf);
       state.raf = 0;
     };
-  }, [mounted, reducedMotion, items.length, measure]);
+  }, [measure]);
 
   /** Rola até o ponto da vitrine em que o projeto `index` está em `local` (0 a 1) do trecho dele. */
   const scrollToReel = (index: number, local: number) => {
@@ -334,20 +374,6 @@ export function ProjectReel() {
     scrollToReel(index, REEL_HOLD + fraction * (1 - REEL_HOLD * 2));
   };
 
-  if (items.length === 0 || (mounted && reducedMotion)) return null;
-
-  // antes de montar, um bloco da mesma altura segura o lugar: a página não muda de tamanho quando a vitrine
-  // aparece (o salto para #contact, por exemplo, cai no lugar certo); o CSS o esconde sem JavaScript, com
-  // prefers-reduced-motion e em telas baixas
-  if (!mounted)
-    return (
-      <div
-        className="ds-reel ds-reel-placeholder"
-        aria-hidden="true"
-        style={{ "--reel-sum": weightSum } as CSSProperties}
-      />
-    );
-
   const current = items[active];
 
   return (
@@ -357,6 +383,7 @@ export function ProjectReel() {
       style={{ "--reel-sum": weightSum } as CSSProperties}
       ref={containerRef}
     >
+      <h2 className="sr-only">Projetos de clientes</h2>
       <div className="ds-reel-pin" ref={pinRef}>
         <div className="ds-reel-grid">
           <nav className="ds-reel-index" aria-label="Projetos da vitrine">
@@ -374,9 +401,12 @@ export function ProjectReel() {
                     aria-label={item.project.title}
                     onClick={() => goTo(index)}
                   >
-                    <span className="ds-reel-num">
-                      {String(index + 1).padStart(2, "0")}
-                    </span>
+                    {/* o número vem do CSS (data-n): o texto visível do botão fica igual ao nome acessível (WCAG 2.5.3) */}
+                    <span
+                      className="ds-reel-num"
+                      aria-hidden="true"
+                      data-n={String(index + 1).padStart(2, "0")}
+                    />
                     <span className="ds-reel-name">{item.project.title}</span>
                     <i
                       className="ds-reel-bar"
@@ -417,6 +447,7 @@ export function ProjectReel() {
               const { config, project } = item;
               const isActive = index === active;
               const attach = isAttached(index);
+              const posters = showsPoster(index);
               const desktop = getShowcaseAssets(config.id, "desktop");
               const phone = getShowcaseAssets(config.id, "mobile");
               return (
@@ -438,22 +469,25 @@ export function ProjectReel() {
                       >
                         <div
                           className="ds-reel-screen"
-                          style={{ backgroundImage: `url(${desktop.poster})` }}
+                          style={
+                            posters
+                              ? { backgroundImage: `url(${desktop.poster})` }
+                              : undefined
+                          }
                         >
-                          {/* biome-ignore lint/a11y/useMediaCaption: vídeo decorativo sem áudio */}
                           <video
                             ref={(element) => {
                               desktopVideos.current[index] = element;
                             }}
                             src={
-                              attach && !phoneOnly
+                              attach
                                 ? getScrubSource(config.id, "desktop")
                                 : undefined
                             }
-                            poster={desktop.poster}
+                            poster={posters ? desktop.poster : undefined}
                             muted
                             playsInline
-                            preload={attach && !phoneOnly ? "auto" : "none"}
+                            preload="metadata"
                             tabIndex={-1}
                             aria-hidden="true"
                             disablePictureInPicture
@@ -465,22 +499,21 @@ export function ProjectReel() {
                       </BrowserFrame>
                       <PhoneFrame
                         className="ds-reel-phone"
-                        poster={phone.poster}
+                        poster={posters ? phone.poster : undefined}
                       >
-                        {/* biome-ignore lint/a11y/useMediaCaption: vídeo decorativo sem áudio */}
                         <video
                           ref={(element) => {
                             phoneVideos.current[index] = element;
                           }}
                           src={
-                            attach
+                            attach && phoneVisible
                               ? getScrubSource(config.id, "mobile")
                               : undefined
                           }
-                          poster={phone.poster}
+                          poster={posters ? phone.poster : undefined}
                           muted
                           playsInline
-                          preload={attach ? "auto" : "none"}
+                          preload="metadata"
                           tabIndex={-1}
                           aria-hidden="true"
                           disablePictureInPicture
@@ -525,31 +558,10 @@ export function ProjectReel() {
                           ))}
                         </ol>
                       </div>
-                      <div className="ds-reel-actions">
-                        <button
-                          type="button"
-                          className="ds-link ds-link-accent"
-                          onClick={() => openProject(config.id)}
-                          aria-haspopup="dialog"
-                        >
-                          Ampliar vídeo
-                        </button>
-                        {project.demoUrl &&
-                          project.demoAvailability !== "unavailable" && (
-                            <a
-                              className="ds-link ds-link-muted"
-                              href={project.demoUrl}
-                              target="_blank"
-                              rel="noreferrer"
-                            >
-                              Abrir projeto
-                              <span className="sr-only">
-                                {" "}
-                                (abre em nova aba)
-                              </span>
-                            </a>
-                          )}
-                      </div>
+                      <ProjectActions
+                        item={item}
+                        onExpand={() => openProject(config.id)}
+                      />
                     </div>
                   </div>
                 </div>

app/components/showcase/ShowcaseProvider.paths.test.tsx

@@ -0,0 +1,557 @@
+import { act, fireEvent, render, screen } from "@testing-library/react";
+import { useState } from "react";
+import { getFeaturedProjects } from "@/lib/portfolio-data";
+import {
+  buildShowcaseItems,
+  ShowcaseProvider,
+  useShowcaseCard,
+  useShowcaseItems,
+  useShowcaseOpen,
+} from "./ShowcaseProvider";
+
+/**
+ * Testes de caminhos-base de ShowcaseProvider (complemento de ShowcaseProvider.test.tsx): register() sem
+ * IntersectionObserver, limiar de visibilidade, quem devolve o mouse, desmontagem do card em destaque, foco
+ * que sai para dentro ou para fora do card, aba oculta, pausa do usuário e a janela ampliada.
+ */
+
+let reducedMotion = false;
+jest.mock("@/app/hooks/useReducedMotion", () => ({
+  useReducedMotion: () => reducedMotion,
+}));
+jest.mock("./ProjectLightbox", () => ({
+  ProjectLightbox: ({
+    index,
+    items,
+    onClose,
+    onNavigate,
+  }: {
+    index: number;
+    items: unknown[];
+    onClose: () => void;
+    onNavigate: (index: number) => void;
+  }) => (
+    <div role="dialog" aria-label="ampliado">
+      aberto:{index} de {items.length}
+      <button type="button" onClick={onClose}>
+        fechar
+      </button>
+      <button type="button" onClick={() => onNavigate(0)}>
+        ir para o primeiro
+      </button>
+      <button type="button" onClick={() => onNavigate(99)}>
+        ir para um que não existe
+      </button>
+    </div>
+  ),
+}));
+
+type FakeObserver = {
+  callback: IntersectionObserverCallback;
+  targets: Set<Element>;
+};
+let observers: FakeObserver[] = [];
+const OriginalObserver = global.IntersectionObserver;
+
+class FakeIntersectionObserver {
+  private readonly state: FakeObserver;
+  constructor(callback: IntersectionObserverCallback) {
+    this.state = { callback, targets: new Set() };
+    observers.push(this.state);
+  }
+  observe(element: Element) {
+    this.state.targets.add(element);
+  }
+  unobserve(element: Element) {
+    this.state.targets.delete(element);
+  }
+  disconnect() {
+    this.state.targets.clear();
+  }
+  takeRecords() {
+    return [];
+  }
+}
+
+function report(target: Element, ratio: number) {
+  act(() => {
+    for (const observer of observers) {
+      observer.callback(
+        [
+          {
+            target,
+            intersectionRatio: ratio,
+            isIntersecting: ratio > 0,
+          } as IntersectionObserverEntry,
+        ],
+        observer as unknown as IntersectionObserver,
+      );
+    }
+  });
+}
+
+function place(element: Element, top: number) {
+  element.getBoundingClientRect = () =>
+    ({
+      top,
+      height: 300,
+      bottom: top + 300,
+      left: 0,
+      right: 400,
+      width: 400,
+      x: 0,
+      y: top,
+    }) as DOMRect;
+}
+
+function flush() {
+  act(() => {
+    jest.advanceTimersByTime(40);
+  });
+}
+
+function Card({ id }: { id: string }) {
+  const { frameRef, active, open, toggleAutoplay, userPaused } =
+    useShowcaseCard(id);
+  return (
+    <article className="ds-card">
+      <div ref={frameRef} data-testid={id} data-active={active} />
+      <button type="button" onClick={open}>
+        ampliar {id}
+      </button>
+      <button type="button" onClick={toggleAutoplay}>
+        pausa {id} {String(userPaused)}
+      </button>
+    </article>
+  );
+}
+
+const projects = getFeaturedProjects(null);
+
+function Cards({ ids }: { ids: string[] }) {
+  return (
+    <ShowcaseProvider projects={projects}>
+      {ids.map((id) => (
+        <Card key={id} id={id} />
+      ))}
+    </ShowcaseProvider>
+  );
+}
+
+function setup(ids = ["sev-modaintima", "lavacao-047"]) {
+  const view = render(<Cards ids={ids} />);
+  const frame = (id: string) => screen.getByTestId(id);
+  // tela de 768px de altura no jsdom: o meio fica em 384
+  if (ids.includes("sev-modaintima")) place(frame("sev-modaintima"), 100); // centro 250
+  if (ids.includes("lavacao-047")) place(frame("lavacao-047"), 230); // centro 380
+  return { view, frame };
+}
+
+const isActive = (element: Element) =>
+  element.getAttribute("data-active") === "true";
+
+beforeEach(() => {
+  jest.useFakeTimers();
+  reducedMotion = false;
+  observers = [];
+  global.IntersectionObserver =
+    FakeIntersectionObserver as unknown as typeof IntersectionObserver;
+});
+
+afterEach(() => {
+  jest.useRealTimers();
+  jest.restoreAllMocks();
+  global.IntersectionObserver = OriginalObserver;
+  Reflect.deleteProperty(document, "hidden");
+});
+
+describe("ShowcaseProvider: IntersectionObserver e visibilidade", () => {
+  it("path: browser without IntersectionObserver -> cards register fine but none ever plays", () => {
+    // @ts-expect-error simula um navegador sem IntersectionObserver
+    global.IntersectionObserver = undefined;
+
+    const { view, frame } = setup();
+    flush();
+
+    expect(isActive(frame("sev-modaintima"))).toBe(false);
+    expect(isActive(frame("lavacao-047"))).toBe(false);
+    expect(() => view.unmount()).not.toThrow();
+  });
+
+  it.each([
+    [0.32, false],
+    [0.33, true],
+    [1, true],
+  ])("path: %f of the card on screen -> visible: %s", (ratio, expected) => {
+    const { frame } = setup(["sev-modaintima"]);
+
+    report(frame("sev-modaintima"), ratio);
+    flush();
+
+    expect(isActive(frame("sev-modaintima"))).toBe(expected);
+  });
+
+  it("path: a visibility report about an element that is not a card -> ignored", () => {
+    const { frame } = setup(["sev-modaintima"]);
+    const stranger = document.createElement("div");
+    report(frame("sev-modaintima"), 0.8);
+    flush();
+
+    report(stranger, 1);
+    flush();
+
+    expect(isActive(frame("sev-modaintima"))).toBe(true);
+  });
+
+  it("path: the card leaves the screen -> it stops being the active one", () => {
+    const { frame } = setup(["sev-modaintima"]);
+    report(frame("sev-modaintima"), 0.8);
+    flush();
+    expect(isActive(frame("sev-modaintima"))).toBe(true);
+
+    report(frame("sev-modaintima"), 0);
+    flush();
+
+    expect(isActive(frame("sev-modaintima"))).toBe(false);
+  });
+
+  it("path: hidden tab -> nobody plays; back to visible -> the closest card plays again", () => {
+    const { frame } = setup();
+    report(frame("sev-modaintima"), 0.8);
+    report(frame("lavacao-047"), 0.8);
+    flush();
+    expect(isActive(frame("lavacao-047"))).toBe(true);
+
+    Object.defineProperty(document, "hidden", {
+      configurable: true,
+      value: true,
+    });
+    act(() => {
+      document.dispatchEvent(new Event("visibilitychange"));
+    });
+    flush();
+    expect(isActive(frame("lavacao-047"))).toBe(false);
+    expect(isActive(frame("sev-modaintima"))).toBe(false);
+
+    Object.defineProperty(document, "hidden", {
+      configurable: true,
+      value: false,
+    });
+    act(() => {
+      document.dispatchEvent(new Event("visibilitychange"));
+    });
+    flush();
+    expect(isActive(frame("lavacao-047"))).toBe(true);
+  });
+});
+
+describe("ShowcaseProvider: mouse e foco", () => {
+  function hoverSetup() {
+    const result = setup();
+    report(result.frame("sev-modaintima"), 0.8);
+    report(result.frame("lavacao-047"), 0.8);
+    flush();
+    return result;
+  }
+
+  it("path: a pen counts as a pointer that hovers", () => {
+    const { frame } = hoverSetup();
+
+    fireEvent.pointerEnter(
+      frame("sev-modaintima").closest(".ds-card") as HTMLElement,
+      { pointerType: "pen" },
+    );
+    flush();
+
+    expect(isActive(frame("sev-modaintima"))).toBe(true);
+  });
+
+  it("path: another card's pointer leaves -> the hovered card keeps the video", () => {
+    const { frame } = hoverSetup();
+    const sev = frame("sev-modaintima").closest(".ds-card") as HTMLElement;
+    const lavacao = frame("lavacao-047").closest(".ds-card") as HTMLElement;
+    fireEvent.pointerEnter(sev, { pointerType: "mouse" });
+    flush();
+    expect(isActive(frame("sev-modaintima"))).toBe(true);
+
+    fireEvent.pointerLeave(lavacao, { pointerType: "mouse" });
+    flush();
+
+    expect(isActive(frame("sev-modaintima"))).toBe(true);
+  });
+
+  it("path: the hovered card is not on screen -> the closest visible card plays instead", () => {
+    const { frame } = hoverSetup();
+    report(frame("sev-modaintima"), 0);
+    fireEvent.pointerEnter(
+      frame("sev-modaintima").closest(".ds-card") as HTMLElement,
+      { pointerType: "mouse" },
+    );
+    flush();
+
+    expect(isActive(frame("sev-modaintima"))).toBe(false);
+    expect(isActive(frame("lavacao-047"))).toBe(true);
+  });
+
+  it("path: focus moves to another element inside the same card -> hover is kept", () => {
+    const { frame } = hoverSetup();
+    const card = frame("sev-modaintima").closest(".ds-card") as HTMLElement;
+    const inside = screen.getByRole("button", {
+      name: /ampliar sev-modaintima/,
+    });
+    fireEvent.focusIn(inside);
+    flush();
+    expect(isActive(frame("sev-modaintima"))).toBe(true);
+
+    fireEvent.focusOut(card, { relatedTarget: inside });
+    flush();
+
+    expect(isActive(frame("sev-modaintima"))).toBe(true);
+  });
+
+  it.each([
+    [
+      "to another card",
+      () => screen.getByRole("button", { name: /ampliar lavacao-047/ }),
+    ],
+    ["to nothing", () => null],
+  ])(
+    "path: focus leaves the card %s -> hover is released",
+    (_label, target) => {
+      const { frame } = hoverSetup();
+      const card = frame("sev-modaintima").closest(".ds-card") as HTMLElement;
+      fireEvent.focusIn(
+        screen.getByRole("button", { name: /ampliar sev-modaintima/ }),
+      );
+      flush();
+      expect(isActive(frame("sev-modaintima"))).toBe(true);
+
+      fireEvent.focusOut(card, { relatedTarget: target() });
+      flush();
+
+      expect(isActive(frame("sev-modaintima"))).toBe(false);
+      expect(isActive(frame("lavacao-047"))).toBe(true);
+    },
+  );
+
+  it("path: the hovered card is removed from the page -> its hover is dropped and another card plays", () => {
+    function Swap() {
+      const [showFirst, setShowFirst] = useState(true);
+      return (
+        <ShowcaseProvider projects={projects}>
+          {showFirst && <Card id="sev-modaintima" />}
+          <Card id="lavacao-047" />
+          <button type="button" onClick={() => setShowFirst(false)}>
+            remover o primeiro
+          </button>
+        </ShowcaseProvider>
+      );
+    }
+    render(<Swap />);
+    const sev = screen.getByTestId("sev-modaintima");
+    const lavacao = screen.getByTestId("lavacao-047");
+    place(sev, 100);
+    place(lavacao, 230);
+    report(sev, 0.8);
+    report(lavacao, 0.8);
+    fireEvent.pointerEnter(sev.closest(".ds-card") as HTMLElement, {
+      pointerType: "mouse",
+    });
+    flush();
+    expect(isActive(sev)).toBe(true);
+
+    fireEvent.click(screen.getByRole("button", { name: "remover o primeiro" }));
+    flush();
+
+    expect(screen.queryByTestId("sev-modaintima")).toBeNull();
+    expect(isActive(lavacao)).toBe(true);
+  });
+});
+
+describe("ShowcaseProvider: pausa e janela ampliada", () => {
+  it("path: the visitor pauses and resumes -> no card plays while paused", () => {
+    const { frame } = setup(["lavacao-047"]);
+    report(frame("lavacao-047"), 0.8);
+    flush();
+    expect(isActive(frame("lavacao-047"))).toBe(true);
+
+    fireEvent.click(
+      screen.getByRole("button", { name: /pausa lavacao-047 false/ }),
+    );
+    flush();
+    expect(isActive(frame("lavacao-047"))).toBe(false);
+
+    fireEvent.click(
+      screen.getByRole("button", { name: /pausa lavacao-047 true/ }),
+    );
+    flush();
+    expect(isActive(frame("lavacao-047"))).toBe(true);
+  });
+
+  it("path: opening a project that is not part of the showcase -> no window", () => {
+    function OpenOutsider() {
+      const { open } = useShowcaseCard("reddit-explorer");
+      return (
+        <button type="button" onClick={open}>
+          ampliar reddit-explorer
+        </button>
+      );
+    }
+    render(
+      <ShowcaseProvider projects={projects}>
+        <OpenOutsider />
+      </ShowcaseProvider>,
+    );
+
+    fireEvent.click(
+      screen.getByRole("button", { name: /ampliar reddit-explorer/ }),
+    );
+    flush();
+
+    expect(screen.queryByRole("dialog")).toBeNull();
+  });
+
+  it("path: navigating in the window to a valid index -> changes project; to an invalid one -> closes", () => {
+    setup();
+    fireEvent.click(
+      screen.getByRole("button", { name: /ampliar lavacao-047/ }),
+    );
+    expect(screen.getByRole("dialog")).toHaveTextContent("aberto:1");
+
+    fireEvent.click(screen.getByRole("button", { name: "ir para o primeiro" }));
+    expect(screen.getByRole("dialog")).toHaveTextContent("aberto:0");
+
+    fireEvent.click(
+      screen.getByRole("button", { name: "ir para um que não existe" }),
+    );
+    expect(screen.queryByRole("dialog")).toBeNull();
+  });
+
+  it("path: reduced motion -> pausing and resuming never makes a card play", () => {
+    reducedMotion = true;
+    const { frame } = setup(["lavacao-047"]);
+    report(frame("lavacao-047"), 1);
+    flush();
+
+    fireEvent.click(
+      screen.getByRole("button", { name: /pausa lavacao-047 false/ }),
+    );
+    flush();
+    fireEvent.click(
+      screen.getByRole("button", { name: /pausa lavacao-047 true/ }),
+    );
+    flush();
+
+    expect(isActive(frame("lavacao-047"))).toBe(false);
+  });
+});
+
+describe("ShowcaseProvider: trabalho por quadro", () => {
+  it("path: no card registered -> scroll and resize schedule no frame", () => {
+    const raf = jest.spyOn(window, "requestAnimationFrame");
+    render(
+      <ShowcaseProvider projects={projects}>
+        <p>sem cards</p>
+      </ShowcaseProvider>,
+    );
+    flush();
+    raf.mockClear();
+
+    act(() => {
+      window.dispatchEvent(new Event("scroll"));
+      window.dispatchEvent(new Event("resize"));
+      document.dispatchEvent(new Event("visibilitychange"));
+    });
+    flush();
+
+    expect(raf).not.toHaveBeenCalled();
+  });
+
+  it("path: several scrolls inside one frame -> evaluated once", () => {
+    const { frame } = setup(["lavacao-047"]);
+    report(frame("lavacao-047"), 0.8);
+    flush();
+    const raf = jest.spyOn(window, "requestAnimationFrame");
+    raf.mockClear();
+
+    act(() => {
+      window.dispatchEvent(new Event("scroll"));
+      window.dispatchEvent(new Event("scroll"));
+      window.dispatchEvent(new Event("scroll"));
+    });
+
+    expect(raf).toHaveBeenCalledTimes(1);
+  });
+});
+
+describe("ShowcaseProvider: ganchos fora do provedor e cartão sem .ds-card", () => {
+  it("path: hooks used outside the provider -> empty list, and open/toggle do nothing", () => {
+    function Outsider() {
+      const items = useShowcaseItems();
+      const open = useShowcaseOpen();
+      const { toggleAutoplay, open: openCard, active } = useShowcaseCard("x");
+      return (
+        <button
+          type="button"
+          onClick={() => {
+            open("sev-modaintima");
+            openCard();
+            toggleAutoplay();
+          }}
+        >
+          itens:{items.length} ativo:{String(active)}
+        </button>
+      );
+    }
+    render(<Outsider />);
+
+    const button = screen.getByRole("button", { name: "itens:0 ativo:false" });
+    expect(() => fireEvent.click(button)).not.toThrow();
+    expect(screen.queryByRole("dialog")).toBeNull();
+  });
+
+  it("path: a card whose frame has no .ds-card ancestor -> the frame itself listens for the pointer", () => {
+    function Bare() {
+      const { frameRef, active } = useShowcaseCard("lavacao-047");
+      return <div ref={frameRef} data-testid="bare" data-active={active} />;
+    }
+    function Other() {
+      const { frameRef, active } = useShowcaseCard("sev-modaintima");
+      return <div ref={frameRef} data-testid="other" data-active={active} />;
+    }
+    render(
+      <ShowcaseProvider projects={projects}>
+        <Other />
+        <Bare />
+      </ShowcaseProvider>,
+    );
+    const bare = screen.getByTestId("bare");
+    const other = screen.getByTestId("other");
+    place(other, 230); // mais perto do meio da tela
+    place(bare, 100);
+    report(other, 0.8);
+    report(bare, 0.8);
+    flush();
+    expect(isActive(other)).toBe(true);
+
+    fireEvent.pointerEnter(bare, { pointerType: "mouse" });
+    flush();
+
+    expect(isActive(bare)).toBe(true);
+    expect(isActive(other)).toBe(false);
+  });
+
+  it("path: projects missing from the list -> only showcase projects that exist are built, in showcase order", () => {
+    const only = projects.filter((project) =>
+      ["as-servicos", "sev-modaintima"].includes(project.id),
+    );
+
+    const items = buildShowcaseItems(only);
+
+    expect(items.map((item) => item.config.id)).toEqual([
+      "sev-modaintima",
+      "as-servicos",
+    ]);
+    expect(buildShowcaseItems([])).toEqual([]);
+  });
+});

app/components/showcase/ShowcaseProvider.test.tsx

@@ -4,6 +4,7 @@ import {
   buildShowcaseItems,
   ShowcaseProvider,
   useShowcaseCard,
+  useShowcaseOpen,
 } from "./ShowcaseProvider";
 
 let reducedMotion = false;
@@ -157,6 +158,59 @@ describe("ShowcaseProvider", () => {
     ).toEqual([]);
   });
 
+  it("serves the reel with only the client projects the home passes in, in showcase order", () => {
+    const clients = projects.filter((project) =>
+      ["as-servicos", "sc-plus", "lavacao-047", "sev-modaintima"].includes(
+        project.id,
+      ),
+    );
+    expect(buildShowcaseItems(clients).map((item) => item.config.id)).toEqual([
+      "sev-modaintima",
+      "lavacao-047",
+      "sc-plus",
+      "as-servicos",
+    ]);
+  });
+
+  it("works with no cards at all: no per-scroll work, and the enlarged window still opens and navigates", () => {
+    const clients = projects.filter((project) =>
+      ["sev-modaintima", "lavacao-047", "sc-plus", "as-servicos"].includes(
+        project.id,
+      ),
+    );
+    function Opener() {
+      const open = useShowcaseOpen();
+      return (
+        <button type="button" onClick={() => open("sc-plus")}>
+          abrir sc-plus
+        </button>
+      );
+    }
+    const frames = jest.spyOn(window, "requestAnimationFrame");
+    render(
+      <ShowcaseProvider projects={clients}>
+        <Opener />
+      </ShowcaseProvider>,
+    );
+    flush();
+    frames.mockClear();
+    act(() => {
+      window.dispatchEvent(new Event("scroll"));
+      window.dispatchEvent(new Event("resize"));
+    });
+    flush();
+    expect(frames).not.toHaveBeenCalled();
+
+    fireEvent.click(screen.getByRole("button", { name: "abrir sc-plus" }));
+    // posição 3 de 4 na lista que a home passou (o NutriScan não está nela)
+    expect(screen.getByRole("dialog", { name: "ampliado" })).toHaveTextContent(
+      "aberto:2",
+    );
+    fireEvent.click(screen.getByRole("button", { name: "fechar" }));
+    expect(screen.queryByRole("dialog")).toBeNull();
+    frames.mockRestore();
+  });
+
   it("plays nothing until a card is on screen, then the one closest to the middle", () => {
     const { frames } = setup();
     flush();

app/components/showcase/ShowcaseProvider.tsx

@@ -111,26 +111,32 @@ export function ShowcaseProvider({
     setActiveId(pickActiveCard(candidates, hovered.current));
   }, []);
 
-  const schedule = useCallback(() => {
-    if (queued.current) return;
-    queued.current = true;
-    frame.current = requestAnimationFrame(evaluate);
-  }, [evaluate]);
+  // sem cards registrados (a home mostra só a vitrine animada) não há o que decidir a cada quadro de rolagem;
+  // `force` vale para o que acabou de mudar a lista (um card saiu), que ainda precisa ser reavaliado
+  const schedule = useCallback(
+    (force = false) => {
+      if (queued.current || (!force && cards.current.size === 0)) return;
+      queued.current = true;
+      frame.current = requestAnimationFrame(evaluate);
+    },
+    [evaluate],
+  );
 
   // com a janela ampliada aberta, ou com preferência por menos movimento, nenhum card toca
   useEffect(() => {
     paused.current = reducedMotion || openId !== null || userPaused;
-    schedule();
+    schedule(true);
   }, [schedule, openId, reducedMotion, userPaused]);
 
   useEffect(() => {
-    window.addEventListener("scroll", schedule, { passive: true });
-    window.addEventListener("resize", schedule);
-    document.addEventListener("visibilitychange", schedule);
+    const onChange = () => schedule();
+    window.addEventListener("scroll", onChange, { passive: true });
+    window.addEventListener("resize", onChange);
+    document.addEventListener("visibilitychange", onChange);
     return () => {
-      window.removeEventListener("scroll", schedule);
-      window.removeEventListener("resize", schedule);
-      document.removeEventListener("visibilitychange", schedule);
+      window.removeEventListener("scroll", onChange);
+      window.removeEventListener("resize", onChange);
+      document.removeEventListener("visibilitychange", onChange);
       cancelAnimationFrame(frame.current);
       queued.current = false;
       observer.current?.disconnect();
@@ -163,7 +169,7 @@ export function ShowcaseProvider({
           observer.current?.unobserve(element);
           cards.current.delete(id);
           if (hovered.current === id) hovered.current = null;
-          schedule();
+          schedule(true);
         };
       },
       setHover(id, isHovered) {

app/components/showcase/showcase.css

@@ -1,7 +1,9 @@
 /*
- * Vitrine dos projetos: moldura de navegador, capa dos cards, celular, vitrine animada (.ds-reel) e vídeo
- * ampliado (.ds-lb). Tudo pensado para a seção escura de Projetos: cantos retos, rótulos em mono, lima como
- * única cor de ação e a cor do site de cada projeto (--accent) só no brilho ao redor do vídeo.
+ * Vitrine dos projetos: moldura de navegador, capa dos cards, celular, vitrine animada (.ds-reel), lista de
+ * projetos (.ds-reel-list) e vídeo ampliado (.ds-lb). Tudo pensado para a seção escura de Projetos: cantos
+ * retos, rótulos curtos em mono (12 px no mínimo), texto de botão em sans 15 px, lima só em detalhes (nenhum
+ * botão preenchido de lima aqui: isso é da ação de contato) e a cor do site de cada projeto (--accent) só no
+ * brilho ao redor do vídeo. Nenhum efeito (grão, partículas, escurecimento) fica por cima das telas.
  */
 
 /* ─────────────────────────── Moldura de navegador ─────────────────────────── */
@@ -50,9 +52,10 @@
   margin-inline: auto;
   padding: 0 9px;
   font-family: var(--font-mono);
-  font-size: 10px;
-  letter-spacing: 0.04em;
-  color: rgba(255, 255, 255, 0.6);
+  font-size: 12px;
+  line-height: 1;
+  letter-spacing: 0.02em;
+  color: rgba(255, 255, 255, 0.68);
   background: rgba(255, 255, 255, 0.05);
   border: 1px solid rgba(255, 255, 255, 0.08);
 
@@ -81,8 +84,7 @@
   }
 
   .ds-bframe-url {
-    height: 18px;
-    font-size: 9px;
+    height: 20px;
   }
 }
 
@@ -175,14 +177,14 @@
   display: inline-flex;
   align-items: center;
   gap: 6px;
-  min-height: 28px;
-  padding: 0 10px;
-  font-family: var(--font-mono);
-  font-size: 10px;
-  letter-spacing: 0.1em;
-  text-transform: uppercase;
-  color: var(--ink);
-  background: var(--slash);
+  min-height: 36px;
+  padding: 0 12px;
+  font-family: var(--font-display);
+  font-size: 15px;
+  font-weight: 500;
+  color: #fff;
+  background: rgba(10, 10, 10, 0.82);
+  border: 1px solid rgba(255, 255, 255, 0.4);
   opacity: 0;
   transform: translateY(6px);
   transition:
@@ -281,7 +283,8 @@
   border-radius: 24px;
   background: #0a0a0a center top / cover no-repeat;
 
-  & > video {
+  & > video,
+  & > img {
     position: absolute;
     inset: 0;
     display: block;
@@ -350,11 +353,11 @@
     gap: 10px;
     min-height: 44px;
     padding: 0 14px;
-    font-family: var(--font-mono);
-    font-size: 11px;
-    letter-spacing: 0.06em;
+    font-family: var(--font-display);
+    font-size: 15px;
+    font-weight: 500;
     white-space: nowrap;
-    color: rgba(255, 255, 255, 0.66);
+    color: rgba(255, 255, 255, 0.72);
     background: rgba(255, 255, 255, 0.03);
     border: 1px solid rgba(255, 255, 255, 0.12);
     cursor: pointer;
@@ -378,8 +381,8 @@
 
     &[aria-current="true"] {
       color: #fff;
-      border-color: rgba(204, 255, 0, 0.55);
-      background: rgba(204, 255, 0, 0.07);
+      border-color: rgba(255, 255, 255, 0.6);
+      background: rgba(255, 255, 255, 0.08);
     }
   }
 }
@@ -391,8 +394,8 @@
   gap: 6px 10px;
   margin-bottom: var(--sp-5);
   font-family: var(--font-mono);
-  font-size: 10px;
-  letter-spacing: 0.14em;
+  font-size: 12px;
+  letter-spacing: 0.08em;
   text-transform: uppercase;
   color: var(--slash);
 }
@@ -409,7 +412,13 @@
 }
 
 .ds-reel-num {
+  font-family: var(--font-mono);
+  font-size: 12px;
   color: var(--slash);
+
+  &::before {
+    content: attr(data-n);
+  }
 }
 
 .ds-reel-name {
@@ -432,13 +441,15 @@
     padding: 0 12px;
     border: 0;
     background: transparent;
-    font-size: 10px;
-    letter-spacing: 0.08em;
-    text-transform: uppercase;
-    color: rgba(255, 255, 255, 0.55);
+    font-family: var(--font-display);
+    font-size: 15px;
+    line-height: 1.25;
+    color: rgba(255, 255, 255, 0.66);
     text-align: left;
 
     & span {
+      font-family: var(--font-mono);
+      font-size: 12px;
       color: rgba(255, 255, 255, 0.5);
     }
 
@@ -526,13 +537,13 @@
   display: flex;
   align-items: center;
   justify-content: center;
+  /* só opacidade: quem não está em cena já é inert (sem foco, sem clique, fora da busca) e aria-hidden */
   opacity: 0;
-  visibility: hidden;
+  pointer-events: none;
   transform: translateY(14px);
   transition:
     opacity 0.5s ease,
-    transform 0.6s var(--ease-out),
-    visibility 0s linear 0.5s;
+    transform 0.6s var(--ease-out);
 
   &[data-state="before"] {
     transform: translateY(-14px);
@@ -540,9 +551,8 @@
 
   &[data-state="active"] {
     opacity: 1;
-    visibility: visible;
+    pointer-events: auto;
     transform: none;
-    transition-delay: 0s;
   }
 }
 
@@ -610,46 +620,6 @@
   min-width: 88px;
 }
 
-/* celular: o celular é o aparelho principal (o notebook some) e a legenda ocupa a largura toda */
-@media (max-width: 639px) {
-  .ds-reel-grid {
-    /* respiro para o botão fixo de preferências de analytics, que ocupa o canto de baixo */
-    padding-bottom: 68px;
-  }
-
-  .ds-reel-layer {
-    align-items: stretch;
-  }
-
-  .ds-reel-set {
-    --caption-h: 12.5rem;
-    width: min(100cqw, 460px);
-    height: 100%;
-    margin-inline: auto;
-    justify-content: space-between;
-  }
-
-  .ds-reel-devices {
-    flex: 1 1 0;
-    min-height: 0;
-    display: flex;
-    justify-content: center;
-  }
-
-  .ds-reel-laptop {
-    display: none;
-  }
-
-  .ds-reel-phone {
-    position: relative;
-    inset: auto;
-    width: auto;
-    min-width: 0;
-    height: 100%;
-    max-width: 100%;
-  }
-}
-
 .ds-reel-caption {
   flex: none;
   display: grid;
@@ -692,8 +662,8 @@
 
 .ds-reel-chapter-count {
   font-family: var(--font-mono);
-  font-size: 11px;
-  letter-spacing: 0.08em;
+  font-size: 12px;
+  letter-spacing: 0.06em;
   color: var(--slash);
 }
 
@@ -718,25 +688,71 @@
   }
 }
 
+/* Ver case e Ampliar vídeo em contorno; Abrir site é link de texto. Nada em lima: o preenchido é do contato. */
 .ds-reel-actions {
   display: flex;
   flex-wrap: wrap;
-  gap: var(--sp-3);
+  align-items: center;
+  gap: var(--sp-2) var(--sp-3);
   margin-top: var(--sp-2);
+
+  & .ds-link.ds-link-muted {
+    padding: 8px 16px;
+    color: #fff;
+    border-color: rgba(255, 255, 255, 0.38);
+    background: transparent;
+  }
+
+  @media (hover: hover) {
+    & .ds-link.ds-link-muted:hover {
+      border-color: #fff;
+      box-shadow: none;
+    }
+  }
+
+  & .ds-link.ds-link-text {
+    color: rgba(255, 255, 255, 0.84);
+  }
 }
 
-.ds-reel-actions .ds-link-muted {
-  border-color: rgba(255, 255, 255, 0.18);
-  color: #fff;
+.ds-reel-expand {
+  cursor: pointer;
+
+  & svg {
+    flex: none;
+    width: 16px;
+    height: 16px;
+    fill: none;
+    stroke: currentColor;
+    stroke-width: 1.6;
+  }
 }
 
-/* tela baixa (celular deitado, janela de desktop curta): a vitrine não cabe, e os cards já mostram os vídeos */
+/* tela baixa (celular deitado, janela de desktop curta): a vitrine fixa não cabe, e a lista de projetos entra no lugar */
 @media (max-height: 560px) {
   .ds-reel {
     display: none;
   }
 }
 
+/* antes de o navegador montar a página, só onde a vitrine fixa vai existir: o bloco reservado aparece e a lista
+   (que o servidor entregou, com o texto e os links) fica escondida; sem JavaScript, a lista é quem aparece */
+.ds-reel-placeholder {
+  display: none;
+}
+
+@media (min-width: 768px) and (min-height: 561px) and (
+    prefers-reduced-motion: no-preference
+  ) and (scripting: enabled) {
+  .ds-reel-placeholder {
+    display: block;
+  }
+
+  .ds-reel-list[data-pending] {
+    display: none;
+  }
+}
+
 /* desktop com pouca altura: a lista de projetos e os trechos têm de caber na altura do pin */
 @media (min-width: 1024px) and (max-height: 700px) {
   .ds-reel-hint {
@@ -765,32 +781,125 @@
   }
 }
 
-/* celular: o subtítulo sai para o aparelho ter mais tela, e o contador "02/05" já faz o papel dos tiques */
-@media (max-width: 639px) {
-  .ds-reel-sub,
-  .ds-reel-ticks {
-    display: none;
-  }
-}
-
-/* celular baixo demais: o aparelho ficaria uma cápsula ilegível */
-@media (max-width: 639px) and (max-height: 600px) {
-  .ds-reel {
-    display: none;
-  }
-}
-
 @media (prefers-reduced-motion: reduce) {
   .ds-reel {
     display: none;
   }
 }
 
-/* sem JavaScript a vitrine nunca monta: o espaço reservado por ela some */
-@media (scripting: none) {
-  .ds-reel-placeholder {
+/* ─────────────────────────── Lista de projetos ─────────────────────────── */
+
+/*
+ * Sem rolagem presa: celular, movimento reduzido e janelas baixas. No celular é um carrossel por toque
+ * (rolagem horizontal com encaixe; o card seguinte aparece pela borda); acima de 768 px, uma grade.
+ */
+.ds-reel-list {
+  margin-top: var(--sp-10);
+}
+
+.ds-reel-items {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(min(100%, 380px), 1fr));
+  gap: var(--sp-8) var(--sp-6);
+  list-style: none;
+}
+
+.ds-reel-item {
+  --accent: var(--slash);
+  display: flex;
+  flex-direction: column;
+  gap: var(--sp-5);
+  min-width: 0;
+}
+
+.ds-reel-item-media {
+  position: relative;
+  isolation: isolate;
+
+  &::before {
+    content: "";
+    position: absolute;
+    inset: -4% 0;
+    z-index: -1;
+    background: radial-gradient(
+      55% 60% at 50% 50%,
+      color-mix(in srgb, var(--accent) 36%, transparent),
+      transparent 72%
+    );
+    filter: blur(36px);
+    opacity: 0.4;
+    pointer-events: none;
+  }
+}
+
+.ds-reel-item-screen {
+  position: relative;
+  aspect-ratio: 16 / 10;
+  overflow: hidden;
+  background: #0a0a0a;
+
+  & > img {
+    display: block;
+    width: 100%;
+    height: 100%;
+    object-fit: cover;
+    object-position: top;
+  }
+}
+
+.ds-reel-item-phone {
+  width: min(62%, 240px);
+  margin-inline: auto;
+}
+
+@media (max-width: 767px) {
+  .ds-reel-list {
+    margin-top: var(--sp-8);
+  }
+
+  .ds-reel-items {
+    display: flex;
+    gap: var(--sp-4);
+    overflow-x: auto;
+    overscroll-behavior-x: contain;
+    scroll-snap-type: x mandatory;
+    scroll-padding-inline: var(--sp-5);
+    scrollbar-width: none;
+    /* o card seguinte aparece pela borda: é o convite para deslizar */
+    margin-inline: calc(var(--sp-5) * -1);
+    padding: 2px var(--sp-5) var(--sp-4);
+  }
+
+  .ds-reel-items::-webkit-scrollbar {
     display: none;
   }
+
+  .ds-reel-item {
+    flex: 0 0 min(82%, 340px);
+    scroll-snap-align: start;
+    padding: var(--sp-5) var(--sp-4);
+    background: rgba(255, 255, 255, 0.03);
+    border: 1px solid rgba(255, 255, 255, 0.1);
+  }
+
+  /* um cartão mais baixo: sem subtítulo a legenda cabe e o celular da moldura ganha espaço */
+  .ds-reel-item .ds-reel-sub {
+    -webkit-line-clamp: 3;
+  }
+}
+
+/* sem JavaScript o carrossel vira lista vertical: nada fica escondido atrás de uma rolagem lateral */
+@media (scripting: none) {
+  .ds-reel-items {
+    display: grid;
+    overflow: visible;
+    margin-inline: 0;
+    padding: 0;
+  }
+
+  .ds-reel-item {
+    flex: none;
+  }
 }
 
 /* ─────────────────────────── Vídeo ampliado ─────────────────────────── */
@@ -870,8 +979,8 @@ html.ds-lb-open {
 
 .ds-lb-count {
   font-family: var(--font-mono);
-  font-size: 10px;
-  letter-spacing: 0.14em;
+  font-size: 12px;
+  letter-spacing: 0.08em;
   color: var(--slash);
 }
 
@@ -893,11 +1002,10 @@ html.ds-lb-open {
   & button {
     min-height: 44px;
     padding: 0 16px;
-    font-family: var(--font-mono);
-    font-size: 11px;
-    letter-spacing: 0.08em;
-    text-transform: uppercase;
-    color: rgba(255, 255, 255, 0.7);
+    font-family: var(--font-display);
+    font-size: 15px;
+    font-weight: 500;
+    color: rgba(255, 255, 255, 0.72);
     background: transparent;
     border: 0;
     cursor: pointer;
@@ -905,9 +1013,11 @@ html.ds-lb-open {
       background 0.2s ease,
       color 0.2s ease;
 
+    /* a versão escolhida: fundo claro e sublinhado em lima (a lima só marca, não preenche o botão) */
     &[aria-pressed="true"] {
-      color: var(--ink);
-      background: var(--slash);
+      color: #fff;
+      background: rgba(255, 255, 255, 0.12);
+      box-shadow: inset 0 -2px 0 var(--slash);
     }
 
     &:focus-visible {
@@ -1007,13 +1117,19 @@ html.ds-lb-open {
   width: 44px;
   height: 44px;
   padding: 0;
-  color: var(--ink);
-  background: var(--slash);
-  border: 0;
+  color: #fff;
+  background: transparent;
+  border: 1px solid rgba(255, 255, 255, 0.5);
   cursor: pointer;
 
+  @media (hover: hover) {
+    &:hover {
+      border-color: #fff;
+    }
+  }
+
   &:focus-visible {
-    outline: 2px solid #fff;
+    outline: 2px solid var(--slash);
     outline-offset: 2px;
   }
 
@@ -1028,7 +1144,7 @@ html.ds-lb-open {
   flex: none;
   min-width: 72px;
   font-family: var(--font-mono);
-  font-size: 11px;
+  font-size: 12px;
   font-variant-numeric: tabular-nums;
   color: rgba(255, 255, 255, 0.7);
 }
@@ -1085,14 +1201,12 @@ html.ds-lb-open {
   list-style: none;
 
   & button {
-    min-height: 36px;
-    padding: 0 12px;
-    font-family: var(--font-mono);
-    font-size: 10px;
-    letter-spacing: 0.08em;
-    text-transform: uppercase;
+    min-height: 40px;
+    padding: 0 14px;
+    font-family: var(--font-display);
+    font-size: 15px;
     white-space: nowrap;
-    color: rgba(255, 255, 255, 0.7);
+    color: rgba(255, 255, 255, 0.76);
     background: transparent;
     border: 1px solid rgba(255, 255, 255, 0.14);
     cursor: pointer;
@@ -1101,6 +1215,8 @@ html.ds-lb-open {
       border-color 0.2s ease;
 
     & span {
+      font-family: var(--font-mono);
+      font-size: 12px;
       color: var(--slash);
     }
 
@@ -1113,7 +1229,7 @@ html.ds-lb-open {
 
     &[aria-current="true"] {
       color: #fff;
-      border-color: var(--slash);
+      border-color: rgba(255, 255, 255, 0.7);
     }
 
     &:focus-visible {
@@ -1132,11 +1248,18 @@ html.ds-lb-open {
 .ds-lb-links {
   display: flex;
   flex-wrap: wrap;
-  gap: var(--sp-3);
+  align-items: center;
+  gap: var(--sp-2) var(--sp-3);
 
-  & .ds-link-muted {
+  & .ds-link.ds-link-muted {
+    padding: 8px 16px;
     color: #fff;
-    border-color: rgba(255, 255, 255, 0.18);
+    border-color: rgba(255, 255, 255, 0.38);
+    background: transparent;
+  }
+
+  & .ds-link.ds-link-text {
+    color: rgba(255, 255, 255, 0.84);
   }
 }
 

app/components/showcase/useShowcaseMedia.paths.test.tsx

@@ -0,0 +1,297 @@
+import { act, render, renderHook } from "@testing-library/react";
+import { type RefObject, useRef } from "react";
+import { renderToString } from "react-dom/server";
+import { MOBILE_QUERY } from "@/lib/device";
+import {
+  NEAR_MARGIN,
+  PINNED_QUERY,
+  useNearViewport,
+  usePinnedViewport,
+  useSaveData,
+  useViewportDevice,
+} from "./useShowcaseMedia";
+
+/**
+ * Testes de caminhos-base dos hooks de mídia da vitrine: aparelho (celular x desktop x sem matchMedia),
+ * vitrine fixa cabe ou não, "economizar dados" e a proximidade com a janela (com e sem IntersectionObserver).
+ */
+
+const originalMatchMedia = window.matchMedia;
+const OriginalObserver = global.IntersectionObserver;
+
+type MediaListener = () => void;
+type FakeQuery = {
+  query: string;
+  matches: boolean;
+  listeners: Set<MediaListener>;
+};
+let queries: FakeQuery[] = [];
+
+/** matchMedia falso: `matching` diz quais consultas valem; cada chamada devolve um objeto que guarda os ouvintes. */
+function mockMedia(matching: string[]) {
+  queries = [];
+  window.matchMedia = jest.fn().mockImplementation((query: string) => {
+    const fake: FakeQuery = {
+      query,
+      matches: matching.includes(query),
+      listeners: new Set(),
+    };
+    queries.push(fake);
+    return {
+      get matches() {
+        return fake.matches;
+      },
+      media: query,
+      addEventListener: (_type: string, listener: MediaListener) =>
+        fake.listeners.add(listener),
+      removeEventListener: (_type: string, listener: MediaListener) =>
+        fake.listeners.delete(listener),
+    };
+  });
+}
+
+function mockNavigator(values: Record<string, unknown>) {
+  for (const [key, value] of Object.entries(values))
+    Object.defineProperty(navigator, key, { configurable: true, value });
+}
+
+afterEach(() => {
+  window.matchMedia = originalMatchMedia;
+  global.IntersectionObserver = OriginalObserver;
+  mockNavigator({ connection: undefined });
+});
+
+describe("useViewportDevice", () => {
+  it("path: server render (no effect yet) -> null, so no media file is chosen", () => {
+    function Probe() {
+      return <span>{String(useViewportDevice())}</span>;
+    }
+
+    expect(renderToString(<Probe />)).toContain("null");
+  });
+
+  it("path: browser without matchMedia -> desktop", () => {
+    // @ts-expect-error simula um navegador sem matchMedia
+    window.matchMedia = undefined;
+
+    const { result } = renderHook(() => useViewportDevice());
+
+    expect(result.current).toBe("desktop");
+  });
+
+  it("path: phone width matches -> mobile", () => {
+    mockMedia([MOBILE_QUERY]);
+
+    const { result } = renderHook(() => useViewportDevice());
+
+    expect(result.current).toBe("mobile");
+    expect(queries.map((q) => q.query)).toEqual([MOBILE_QUERY]);
+  });
+
+  it("path: phone width does not match -> desktop", () => {
+    mockMedia([]);
+
+    const { result } = renderHook(() => useViewportDevice());
+
+    expect(result.current).toBe("desktop");
+  });
+
+  it("path: the window is resized across the breakpoint -> follows both ways", () => {
+    mockMedia([]);
+    const { result } = renderHook(() => useViewportDevice());
+    expect(result.current).toBe("desktop");
+
+    act(() => {
+      queries[0].matches = true;
+      for (const listener of queries[0].listeners) listener();
+    });
+    expect(result.current).toBe("mobile");
+
+    act(() => {
+      queries[0].matches = false;
+      for (const listener of queries[0].listeners) listener();
+    });
+    expect(result.current).toBe("desktop");
+  });
+
+  it("path: unmount -> the media listener is removed", () => {
+    mockMedia([]);
+    const { unmount } = renderHook(() => useViewportDevice());
+    expect(queries[0].listeners.size).toBe(1);
+
+    unmount();
+
+    expect(queries[0].listeners.size).toBe(0);
+  });
+});
+
+describe("usePinnedViewport", () => {
+  it("path: server render -> null until the browser mounts", () => {
+    function Probe() {
+      return <span>{String(usePinnedViewport())}</span>;
+    }
+
+    expect(renderToString(<Probe />)).toContain("null");
+  });
+
+  it("path: browser without matchMedia -> the pinned reel is allowed", () => {
+    // @ts-expect-error simula um navegador sem matchMedia
+    window.matchMedia = undefined;
+
+    const { result } = renderHook(() => usePinnedViewport());
+
+    expect(result.current).toBe(true);
+  });
+
+  it("path: the screen is wide and tall enough -> true, using the shared query", () => {
+    mockMedia([PINNED_QUERY]);
+
+    const { result } = renderHook(() => usePinnedViewport());
+
+    expect(result.current).toBe(true);
+    expect(queries.map((q) => q.query)).toEqual([PINNED_QUERY]);
+    expect(PINNED_QUERY).toBe("(min-width: 768px) and (min-height: 561px)");
+  });
+
+  it("path: the screen is too small (phone or short window) -> false", () => {
+    mockMedia([]);
+
+    const { result } = renderHook(() => usePinnedViewport());
+
+    expect(result.current).toBe(false);
+  });
+
+  it("path: the window changes size -> follows, and unmount removes the listener", () => {
+    mockMedia([]);
+    const { result, unmount } = renderHook(() => usePinnedViewport());
+    expect(result.current).toBe(false);
+
+    act(() => {
+      queries[0].matches = true;
+      for (const listener of queries[0].listeners) listener();
+    });
+    expect(result.current).toBe(true);
+
+    unmount();
+    expect(queries[0].listeners.size).toBe(0);
+  });
+});
+
+describe("useSaveData", () => {
+  it.each([
+    ["saveData on", { saveData: true }, true],
+    ["saveData off", { saveData: false }, false],
+    ["no connection info", undefined, false],
+  ])("path: %s -> %s", (_label, connection, expected) => {
+    mockNavigator({ connection });
+
+    const { result } = renderHook(() => useSaveData());
+
+    expect(result.current).toBe(expected);
+  });
+
+  it("path: server render -> false (the lightest assumption is not 'save data')", () => {
+    mockNavigator({ connection: { saveData: true } });
+    function Probe() {
+      return <span>{String(useSaveData())}</span>;
+    }
+
+    expect(renderToString(<Probe />)).toContain("false");
+  });
+});
+
+describe("useNearViewport", () => {
+  type Entry = { isIntersecting: boolean };
+  let callbacks: Array<(entries: Entry[]) => void> = [];
+  let observers: Array<{
+    observe: jest.Mock;
+    disconnect: jest.Mock;
+    options?: IntersectionObserverInit;
+  }> = [];
+
+  beforeEach(() => {
+    callbacks = [];
+    observers = [];
+    global.IntersectionObserver = class {
+      observe = jest.fn();
+      disconnect = jest.fn();
+      constructor(
+        callback: (entries: Entry[]) => void,
+        options?: IntersectionObserverInit,
+      ) {
+        callbacks.push(callback);
+        observers.push({
+          observe: this.observe,
+          disconnect: this.disconnect,
+          options,
+        });
+      }
+    } as unknown as typeof IntersectionObserver;
+  });
+
+  function Probe({ attach = true }: { attach?: boolean }) {
+    const ref = useRef<HTMLDivElement>(null);
+    const near = useNearViewport(ref as RefObject<Element | null>);
+    return (
+      <div>
+        {attach && <div ref={ref} data-testid="target" />}
+        <output>{String(near)}</output>
+      </div>
+    );
+  }
+
+  it("path: element far from the window -> false, observing it with a one-screen margin", () => {
+    const view = render(<Probe />);
+
+    expect(view.container.querySelector("output")).toHaveTextContent("false");
+    expect(observers).toHaveLength(1);
+    expect(observers[0].options).toEqual({ rootMargin: NEAR_MARGIN });
+    expect(observers[0].observe).toHaveBeenCalledWith(
+      view.getByTestId("target"),
+    );
+  });
+
+  it("path: the observer reports nothing intersecting -> still false", () => {
+    const view = render(<Probe />);
+
+    act(() => callbacks[0]([{ isIntersecting: false }]));
+
+    expect(view.container.querySelector("output")).toHaveTextContent("false");
+  });
+
+  it("path: the element gets within a screen -> true, and it stays true when it leaves again", () => {
+    const view = render(<Probe />);
+
+    act(() =>
+      callbacks[0]([{ isIntersecting: false }, { isIntersecting: true }]),
+    );
+    expect(view.container.querySelector("output")).toHaveTextContent("true");
+
+    act(() => callbacks[0]([{ isIntersecting: false }]));
+    expect(view.container.querySelector("output")).toHaveTextContent("true");
+  });
+
+  it("path: no ref target -> no observer is created and the answer stays false", () => {
+    const view = render(<Probe attach={false} />);
+
+    expect(observers).toHaveLength(0);
+    expect(view.container.querySelector("output")).toHaveTextContent("false");
+  });
+
+  it("path: browser without IntersectionObserver -> assumes near so the poster still loads", () => {
+    // @ts-expect-error simula um navegador sem IntersectionObserver
+    global.IntersectionObserver = undefined;
+
+    const view = render(<Probe />);
+
+    expect(view.container.querySelector("output")).toHaveTextContent("true");
+  });
+
+  it("path: unmount -> the observer is disconnected", () => {
+    const view = render(<Probe />);
+
+    view.unmount();
+
+    expect(observers[0].disconnect).toHaveBeenCalledTimes(1);
+  });
+});

app/components/showcase/useShowcaseMedia.ts

@@ -0,0 +1,82 @@
+"use client";
+
+import { type RefObject, useEffect, useState } from "react";
+import { isSaveData, MOBILE_QUERY } from "@/lib/device";
+import type { Device } from "@/lib/project-showcase";
+
+/**
+ * Versão de vídeo e pôster que vale para o aparelho: "mobile" abaixo de 768 px, "desktop" acima. É `null`
+ * até a página montar no navegador (no servidor nenhum arquivo de mídia é escolhido: só o espaço da capa).
+ */
+export function useViewportDevice(): Device | null {
+  const [device, setDevice] = useState<Device | null>(null);
+  useEffect(() => {
+    if (typeof window.matchMedia !== "function") {
+      setDevice("desktop");
+      return;
+    }
+    const query = window.matchMedia(MOBILE_QUERY);
+    const update = () => setDevice(query.matches ? "mobile" : "desktop");
+    update();
+    query.addEventListener("change", update);
+    return () => query.removeEventListener("change", update);
+  }, []);
+  return device;
+}
+
+/** Telas em que a vitrine fixa cabe: tablet ou desktop, com altura para o notebook e a legenda (showcase.css usa a mesma conta). */
+export const PINNED_QUERY = "(min-width: 768px) and (min-height: 561px)";
+
+/** A vitrine fixa cabe nesta tela? `null` até montar no navegador. */
+export function usePinnedViewport(): boolean | null {
+  const [pinned, setPinned] = useState<boolean | null>(null);
+  useEffect(() => {
+    if (typeof window.matchMedia !== "function") {
+      setPinned(true);
+      return;
+    }
+    const query = window.matchMedia(PINNED_QUERY);
+    const update = () => setPinned(query.matches);
+    update();
+    query.addEventListener("change", update);
+    return () => query.removeEventListener("change", update);
+  }, []);
+  return pinned;
+}
+
+/** "Economizar dados" ligado (lido no navegador, depois de montar): só pôsteres, nenhum vídeo baixado. */
+export function useSaveData(): boolean {
+  const [saveData, setSaveData] = useState(false);
+  useEffect(() => {
+    setSaveData(isSaveData());
+  }, []);
+  return saveData;
+}
+
+/** Margem em volta da janela dentro da qual uma seção conta como "perto": uma tela acima e abaixo. */
+export const NEAR_MARGIN = "100% 0px";
+
+/**
+ * Verdadeiro quando o elemento chegou a até ~1 tela da janela: só então o pôster dele é pedido. Depois de
+ * perto, continua verdadeiro (o pôster já baixado não some e volta).
+ */
+export function useNearViewport(ref: RefObject<Element | null>): boolean {
+  const [near, setNear] = useState(false);
+  useEffect(() => {
+    const element = ref.current;
+    if (!element) return;
+    if (typeof IntersectionObserver === "undefined") {
+      setNear(true);
+      return;
+    }
+    const observer = new IntersectionObserver(
+      (entries) => {
+        if (entries.some((entry) => entry.isIntersecting)) setNear(true);
+      },
+      { rootMargin: NEAR_MARGIN },
+    );
+    observer.observe(element);
+    return () => observer.disconnect();
+  }, [ref]);
+  return near;
+}

app/globals.css

@@ -137,10 +137,9 @@ html {
   background: var(--ink);
   color: var(--white);
   padding: 10px 14px;
-  font-size: 11px;
-  font-weight: 700;
-  letter-spacing: 0.08em;
-  text-transform: uppercase;
+  font-family: var(--font-display);
+  font-size: 15px;
+  font-weight: 600;
   text-decoration: none;
   transition: transform 0.2s var(--ease-out);
 }
@@ -174,6 +173,12 @@ html {
     );
   mix-blend-mode: overlay;
   opacity: 0.08;
+  transition: opacity 0.3s ease;
+}
+
+/* partículas e efeitos nunca ficam por cima das telas dos projetos (FilmGrain marca quando uma está à vista) */
+.film-grain[data-over-projects] {
+  opacity: 0;
 }
 
 @media (prefers-reduced-motion: reduce), (pointer: coarse) {
@@ -186,7 +191,8 @@ body {
   position: relative;
   background: var(--paper);
   color: var(--ink);
-  font-family: var(--font-mono);
+  /* sans por padrão: a mono é só dos rótulos (.ds-eyebrow, .ds-kicker, .ds-tag...), que a pedem à parte */
+  font-family: var(--font-body);
   font-size: 14px;
   line-height: 1.68;
 }
@@ -325,10 +331,11 @@ textarea {
   }
 }
 
+/* rótulos curtos em mono: 12 px no mínimo e espaçamento moderado */
 .ds-eyebrow,
 .ds-kicker {
-  font-size: 10px;
-  letter-spacing: 0.12em;
+  font-size: 12px;
+  letter-spacing: 0.08em;
   text-transform: uppercase;
   color: var(--meta);
 }
@@ -422,8 +429,8 @@ textarea {
   padding: 8px 12px;
   border: 1px solid rgba(10, 10, 10, 0.12);
   background: rgba(10, 10, 10, 0.03);
-  font-size: 11px;
-  letter-spacing: 0.04em;
+  font-size: 12px;
+  letter-spacing: 0.02em;
   text-transform: none;
   font-weight: 500;
   /* pílula inteira numa linha: a quebra acontece entre tags (.ds-tags wrap), nunca dentro dela */
@@ -440,8 +447,8 @@ textarea {
 }
 
 .ds-section-dark .ds-tag:hover {
-  border-color: rgba(204, 255, 0, 0.3);
-  box-shadow: 0 2px 16px rgba(204, 255, 0, 0.1);
+  border-color: rgba(255, 255, 255, 0.3);
+  box-shadow: 0 2px 16px rgba(255, 255, 255, 0.06);
 }
 
 .ds-metric {
@@ -449,11 +456,14 @@ textarea {
   align-items: center;
   gap: var(--sp-2);
   color: rgba(10, 10, 10, 0.65);
-  font-size: 10px;
-  letter-spacing: 0.1em;
+  font-size: 12px;
+  letter-spacing: 0.06em;
   text-transform: uppercase;
 }
 
+/* Botões e links de ação: texto em sans 15 px, sem caixa-alta mono. O verde-limão preenchido
+   (.ds-link-accent) é só da ação de contato; as demais ações usam contorno (.ds-link-muted) ou
+   link de texto (.ds-link-text). */
 .ds-link {
   display: inline-flex;
   align-items: center;
@@ -461,9 +471,12 @@ textarea {
   min-height: 44px; /* alvo de toque minimo e mesma altura em todos os botoes */
   gap: var(--sp-2);
   text-decoration: none;
-  font-size: 11px;
-  letter-spacing: 0.08em;
-  text-transform: uppercase;
+  font-family: var(--font-display);
+  font-size: 15px;
+  font-weight: 500;
+  line-height: 1.25;
+  letter-spacing: 0;
+  text-transform: none;
   transition:
     transform 0.2s ease,
     background 0.2s ease,
@@ -478,6 +491,7 @@ textarea {
   color: var(--ink);
   background: var(--slash);
   padding: 12px 18px;
+  font-weight: 600;
   transition:
     transform 0.25s ease,
     box-shadow 0.25s ease,
@@ -497,9 +511,10 @@ textarea {
     0 0 60px rgba(204, 255, 0, 0.22);
 }
 
+/* contorno: ação secundária (sem lima) */
 .ds-link-muted {
   padding: 12px 18px;
-  border: 1px solid var(--border);
+  border: 1px solid rgba(10, 10, 10, 0.28);
   transition:
     transform 0.25s ease,
     box-shadow 0.25s ease,
@@ -512,8 +527,21 @@ textarea {
 }
 
 .ds-section-dark .ds-link-muted:hover {
-  border-color: rgba(204, 255, 0, 0.35);
-  box-shadow: 0 4px 20px rgba(204, 255, 0, 0.08);
+  border-color: rgba(255, 255, 255, 0.7);
+  box-shadow: none;
+}
+
+/* link de texto: ação terciária, sublinhada, sem caixa */
+.ds-link-text {
+  padding: 0 2px;
+  text-decoration: underline;
+  text-decoration-thickness: 1px;
+  text-underline-offset: 5px;
+}
+
+.ds-link-text:hover {
+  transform: none;
+  text-decoration-thickness: 2px;
 }
 
 .ds-list {
@@ -531,8 +559,8 @@ textarea {
 .ds-loading,
 .ds-error {
   padding: var(--sp-10) clamp(24px, 6vw, 64px);
-  font-size: 11px;
-  letter-spacing: 0.1em;
+  font-size: 12px;
+  letter-spacing: 0.08em;
   text-transform: uppercase;
 }
 
@@ -563,7 +591,7 @@ textarea {
 }
 
 .ds-section-dark .ds-link-muted {
-  border-color: rgba(255, 255, 255, 0.12);
+  border-color: rgba(255, 255, 255, 0.38);
 }
 
 .ds-draw-line {
@@ -673,15 +701,13 @@ textarea {
   right: var(--sp-3);
   z-index: 1;
   min-height: 44px;
-  border: 1px solid var(--slash);
+  border: 1px solid rgba(244, 242, 237, 0.5);
   background: var(--ink);
   color: var(--paper);
   padding-inline: var(--sp-3);
-  font-family: var(--font-mono);
-  font-size: 11px;
-  font-weight: 700;
-  letter-spacing: 0.06em;
-  text-transform: uppercase;
+  font-family: var(--font-display);
+  font-size: 15px;
+  font-weight: 500;
   cursor: pointer;
 }
 
@@ -815,17 +841,6 @@ textarea {
     margin-bottom: var(--sp-8);
   }
 
-  /* rotulos em 11-12px (antes 9-11px): legiveis no celular sem perder o estilo tecnico */
-  .ds-eyebrow,
-  .ds-kicker {
-    font-size: 11px;
-  }
-
-  .ds-tag,
-  .ds-link {
-    font-size: 12px;
-  }
-
   .ds-section-title {
     font-size: clamp(24px, 8vw, 34px);
   }
@@ -847,7 +862,6 @@ textarea {
   }
 
   .ds-tag {
-    font-size: 10px;
     padding: 7px 10px;
   }
 }
@@ -994,9 +1008,10 @@ textarea {
 }
 
 /* Hero: palco de 100svh; em telas grandes ele fica fixo enquanto a rolagem conduz o mergulho da cena 3D.
-   --hero-p (0 a 1) vem de cinematic/HeroField.tsx. */
+   --hero-p (0 a 1) e --hero-open (0 a 1: a máscara do fundo se abrindo) vêm de cinematic/HeroField.tsx. */
 .hero {
   --hero-p: 0;
+  --hero-open: 0;
   isolation: isolate;
 }
 
@@ -1008,7 +1023,21 @@ textarea {
   overflow: hidden;
 }
 
-/* Sem WebGL (ou antes de a cena carregar): malha de pontos estática no lugar das camadas */
+/* Máscara dos fundos ambientes do hero (cena 3D e malha estática): transparente no miolo, onde ficam o título
+   e as molduras da direita, e opaca nas bordas e cantos. Com o mergulho (--hero-open 0 → 1) o miolo some e o
+   fundo aparece inteiro, quando o texto e a coluna da direita já saíram de cena. */
+.hero-glow::after,
+.hero-field {
+  --clear: calc((1 - var(--hero-open)) * 52% - 1%);
+  --feather: calc((1 - var(--hero-open)) * 30%);
+  mask-image: radial-gradient(
+    ellipse at 46% 50%,
+    transparent var(--clear),
+    #000 calc(var(--clear) + var(--feather) + 1%)
+  );
+}
+
+/* Sem WebGL, com aparelho que não aguenta a cena, ou antes de ela carregar: malha de pontos estática, leve */
 .hero-glow::after {
   content: "";
   position: absolute;
@@ -1016,7 +1045,7 @@ textarea {
   background:
     radial-gradient(circle, rgba(244, 242, 237, 0.22) 1px, transparent 1.5px) 0
     0 / 22px 22px;
-  mask: radial-gradient(38% 46% at 74% 50%, #000, transparent 75%);
+  opacity: 0.6;
   transition: opacity 1.2s var(--ease-out);
 }
 
@@ -1024,14 +1053,23 @@ textarea {
   opacity: 0;
 }
 
+/* Fundo ambiente: a cena 3D fica com pouca opacidade (sobe para a opacidade cheia só no mergulho). O
+   desenho entra por animação (e não por transition) para a opacidade poder seguir a rolagem sem atraso. */
 .hero-field {
   position: absolute;
   inset: 0;
   opacity: 0;
-  transition: opacity 1.6s var(--ease-out);
+  pointer-events: none;
 
   &[data-ready] {
-    opacity: 1;
+    opacity: calc(0.5 + 0.5 * var(--hero-open));
+    animation: hero-field-in 1.6s var(--ease-out) both;
+  }
+}
+
+@keyframes hero-field-in {
+  from {
+    opacity: 0;
   }
 }
 
@@ -1110,46 +1148,11 @@ textarea {
   }
 }
 
-/* Etiquetas presas às camadas da cena: a posição vem da cena a cada quadro (transform), o recuo para a
-   esquerda do ponto de ancoragem fica no translate */
-.hero-tag {
-  position: absolute;
-  top: 0;
-  left: 0;
-  display: none;
-  max-width: 230px;
-  translate: calc(-100% - 14px) -50%;
-  border: 1px solid rgba(244, 242, 237, 0.14);
-  background: rgba(10, 10, 10, 0.62);
-  backdrop-filter: blur(4px);
-  padding: 7px 11px;
-  color: rgba(244, 242, 237, 0.78);
-  font: 13px / 1.35 var(--font-body);
-  text-align: right;
-  opacity: 0;
-  pointer-events: none;
-
-  &::after {
-    content: "";
-    position: absolute;
-    top: 50%;
-    right: -14px;
-    width: 14px;
-    height: 1px;
-    background: var(--slash);
-  }
-
-  @media (min-width: 1024px) {
-    display: block;
-  }
-}
-
-.hero-tag-title,
 .hero-caption-title {
   display: block;
   color: var(--slash);
-  font: 600 11px / 1.4 var(--font-mono);
-  letter-spacing: 0.14em;
+  font: 600 12px / 1.4 var(--font-mono);
+  letter-spacing: 0.08em;
   text-transform: uppercase;
 }
 
@@ -1244,6 +1247,12 @@ textarea {
     opacity: calc(1 - var(--hero-p) * 5);
   }
 
+  /* a coluna da direita (molduras) sai junto com o texto: o fundo 3D se abre sem passar atrás dela */
+  .hero-aside {
+    transform: translate3d(0, calc(var(--hero-p) * -10vh), 0);
+    opacity: calc(1 - var(--hero-p) * 4.2);
+  }
+
   .hero-scrim {
     opacity: calc(1 - var(--hero-p) * 1.4);
   }
@@ -1355,475 +1364,6 @@ html.lenis {
   will-change: transform, opacity;
 }
 
-/* Interactive quality laboratory — scoped to the Lighthouse section. */
-.quality-lab {
-  --quality-muted: color-mix(in srgb, var(--paper) 72%, transparent);
-  --quality-line: color-mix(in srgb, var(--paper) 18%, transparent);
-  color: var(--paper);
-}
-
-.quality-intro {
-  display: grid;
-  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.3fr);
-  gap: var(--sp-12);
-  align-items: center;
-  margin-bottom: var(--sp-10);
-}
-
-.quality-copy .ds-eyebrow {
-  color: var(--slash);
-  margin-bottom: var(--sp-5);
-}
-
-.quality-copy .ds-section-title {
-  max-width: 16ch;
-}
-
-.quality-copy h2 span {
-  display: block;
-  color: var(--slash);
-}
-
-.quality-copy > p:not(.ds-eyebrow) {
-  max-width: 44ch;
-  margin: var(--sp-6) 0;
-  color: var(--quality-muted);
-  font-size: 15px;
-  line-height: 1.8;
-}
-
-.quality-copy .ds-link {
-  white-space: normal;
-  line-height: 1.7;
-}
-
-.quality-visual {
-  min-width: 0;
-  border: 1px solid var(--quality-line);
-}
-
-.quality-visual-label {
-  display: flex;
-  justify-content: space-between;
-  gap: var(--sp-4);
-  border-bottom: 1px solid var(--quality-line);
-  padding: var(--sp-4);
-  color: var(--quality-muted);
-  font: 10px / 1.5 var(--font-mono);
-  text-transform: uppercase;
-  letter-spacing: 0.06em;
-}
-
-.quality-visual-label span:first-child {
-  color: var(--paper);
-}
-
-.quality-blueprint {
-  display: block;
-  width: 100%;
-  height: auto;
-}
-
-.quality-dimensions {
-  stroke: var(--quality-line);
-}
-
-.quality-dimensions text {
-  fill: var(--quality-muted);
-  stroke: none;
-  font: 9px var(--font-mono);
-}
-
-.quality-browser-frame {
-  fill: var(--ink);
-  stroke: color-mix(in srgb, var(--paper) 38%, transparent);
-}
-
-.quality-wire {
-  stroke: color-mix(in srgb, var(--paper) 30%, transparent);
-}
-
-.quality-browser-dots {
-  fill: var(--quality-muted);
-}
-
-.quality-address {
-  fill: var(--quality-muted);
-  font: 10px var(--font-mono);
-}
-
-.quality-browser-heading {
-  fill: var(--paper);
-  font: 700 24px var(--font-display);
-}
-
-.quality-browser-button {
-  fill: var(--slash-dim);
-  stroke: color-mix(in srgb, var(--slash) 50%, transparent);
-}
-
-.quality-browser-button-label {
-  fill: var(--paper);
-  font: 9px var(--font-mono);
-}
-
-.quality-layer {
-  stroke: var(--slash);
-  stroke-width: 1.2px;
-  opacity: 0;
-  transition: opacity 180ms ease-out;
-}
-
-.quality-layer text {
-  fill: var(--slash);
-  stroke: none;
-  font: 10px var(--font-mono);
-}
-
-.quality-layer circle {
-  fill: var(--slash);
-}
-
-.quality-highlight {
-  fill: color-mix(in srgb, var(--slash) 5%, transparent);
-}
-
-.quality-focus-frame {
-  stroke-width: 2px;
-  stroke-dasharray: 5 3;
-}
-
-.quality-lab[data-inspection="performance"] [data-layer="performance"],
-.quality-lab[data-inspection="accessibility"] [data-layer="accessibility"],
-.quality-lab[data-inspection="practices"] [data-layer="practices"],
-.quality-lab[data-inspection="seo"] [data-layer="seo"] {
-  opacity: 1;
-}
-
-.quality-annotation {
-  fill: var(--ink);
-  stroke: none;
-}
-
-@media (prefers-reduced-motion: no-preference) {
-  .quality-lab[data-inspection="performance"]
-    [data-layer="performance"]
-    .quality-trace,
-  .quality-lab[data-inspection="accessibility"]
-    [data-layer="accessibility"]
-    .quality-trace,
-  .quality-lab[data-inspection="practices"]
-    [data-layer="practices"]
-    .quality-trace,
-  .quality-lab[data-inspection="seo"] [data-layer="seo"] .quality-trace {
-    stroke-dasharray: 1;
-    animation: quality-trace 650ms ease-out;
-  }
-}
-
-/* Entrada do diagrama (classe is-drawing posta por useCinematicScroll): linhas se desenham e rótulos
-   aparecem uma única vez, sem acompanhar cada quadro da rolagem */
-@media (prefers-reduced-motion: no-preference) {
-  /* só com as transições ativas (html.lenis): sem o script, o diagrama aparece normalmente */
-  html.lenis .quality-lab:not(.is-drawing)
-    :is(.quality-blueprint, .quality-visual-label, .quality-visual figcaption) {
-    opacity: 0;
-  }
-
-  .quality-lab.is-drawing
-    .quality-blueprint
-    :is(
-      .quality-dimensions path,
-      .quality-browser-frame,
-      .quality-wire,
-      .quality-browser-button
-    ) {
-    stroke-dasharray: 1800; /* maior que o maior contorno (moldura: ~1600) */
-    animation: quality-draw 1.1s var(--ease-out) both;
-  }
-
-  .quality-lab.is-drawing
-    :is(.quality-blueprint, .quality-visual-label, .quality-visual figcaption) {
-    animation: quality-fade 0.6s var(--ease-out) both;
-  }
-}
-
-@keyframes quality-draw {
-  from {
-    stroke-dashoffset: 1800;
-  }
-  to {
-    stroke-dashoffset: 0;
-  }
-}
-
-@keyframes quality-fade {
-  from {
-    opacity: 0;
-  }
-}
-
-@keyframes quality-trace {
-  from {
-    stroke-dashoffset: 1;
-  }
-  to {
-    stroke-dashoffset: 0;
-  }
-}
-
-.quality-visual figcaption {
-  display: grid;
-  min-height: 64px;
-  border-top: 1px solid var(--quality-line);
-  padding: var(--sp-4);
-  color: var(--quality-muted);
-  font-size: 12px;
-  line-height: 1.65;
-}
-
-/* Overlapping hidden panels reserve the tallest content without fixed heights. */
-.quality-visual figcaption span,
-.quality-report {
-  grid-area: 1 / 1;
-}
-
-.quality-visual figcaption span[aria-hidden="true"],
-.quality-report[aria-hidden="true"] {
-  visibility: hidden;
-}
-
-.quality-report-stack {
-  display: grid;
-}
-
-.quality-controls {
-  display: grid;
-  grid-template-columns: repeat(4, minmax(0, 1fr));
-  min-width: 0;
-  border: 0;
-}
-
-.quality-control {
-  position: relative;
-  min-width: 0;
-  cursor: pointer;
-}
-
-.quality-control input {
-  position: absolute;
-  inset: 0;
-  width: 100%;
-  height: 100%;
-  opacity: 0;
-  cursor: pointer;
-}
-
-.quality-control-content {
-  display: flex;
-  flex-direction: column;
-  gap: var(--sp-3);
-  height: 100%;
-  padding: var(--sp-5);
-  border: 1px solid var(--quality-line);
-  border-top-width: 2px;
-  transition:
-    background-color 180ms ease-out,
-    border-color 180ms ease-out;
-}
-
-.quality-control + .quality-control .quality-control-content {
-  border-left: 0;
-}
-
-.quality-control:hover .quality-control-content {
-  background: color-mix(in srgb, var(--paper) 5%, transparent);
-}
-
-.quality-control input:checked + .quality-control-content {
-  border-top-color: var(--slash);
-  background: var(--slash-dim);
-}
-
-.quality-control input:focus-visible + .quality-control-content {
-  outline: 2px solid var(--slash);
-  outline-offset: 4px;
-}
-
-.quality-control-name {
-  display: flex;
-  align-items: center;
-  gap: var(--sp-2);
-  font-size: 15px;
-  font-weight: 600;
-}
-
-.quality-control-name::before {
-  content: "";
-  width: 7px;
-  height: 7px;
-  flex-shrink: 0;
-  border: 1px solid currentColor;
-  border-radius: 50%;
-}
-
-.quality-control input:checked + span .quality-control-name::before {
-  background: var(--slash);
-  border-color: var(--slash);
-}
-
-.quality-control-target {
-  display: flex;
-  align-items: baseline;
-  gap: var(--sp-2);
-  color: var(--quality-muted);
-  font: 11px / 1.2 var(--font-mono);
-}
-
-.quality-control-target strong {
-  margin-left: auto;
-  color: var(--paper);
-  font-size: 36px;
-  font-weight: 500;
-  font-variant-numeric: tabular-nums;
-}
-
-.quality-control input:checked + span strong {
-  color: var(--slash);
-}
-
-.quality-hint,
-.quality-disclaimer {
-  color: var(--quality-muted);
-  font-size: 12px;
-  line-height: 1.8;
-}
-
-.quality-hint {
-  margin-top: var(--sp-4);
-}
-
-.quality-report {
-  display: grid;
-  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
-  align-items: start;
-  gap: var(--sp-12);
-  min-height: 240px;
-  padding: var(--sp-8) 0;
-  border-bottom: 1px solid var(--quality-line);
-}
-
-.quality-code {
-  color: var(--slash);
-  font: 10px / 1.8 var(--font-mono);
-  letter-spacing: 0.04em;
-  overflow-wrap: anywhere;
-}
-
-.quality-report h3 {
-  margin: var(--sp-2) 0 var(--sp-3);
-  font: 600 clamp(20px, 2.4vw, 28px) / 1.2 var(--font-display);
-  letter-spacing: -0.025em;
-}
-
-.quality-report-copy > p:last-child {
-  max-width: 60ch;
-  color: var(--quality-muted);
-  font-size: 14px;
-  line-height: 1.8;
-}
-
-.quality-report ul {
-  list-style: none;
-  margin: 0;
-  padding: 0;
-}
-
-.quality-report li {
-  display: flex;
-  gap: var(--sp-3);
-  padding: var(--sp-3) 0;
-  border-bottom: 1px solid var(--quality-line);
-  font-size: 13px;
-  line-height: 1.65;
-}
-
-.quality-report li span {
-  color: var(--slash);
-}
-
-.quality-disclaimer {
-  margin-top: var(--sp-5);
-  max-width: 90ch;
-}
-
-@media (max-width: 1000px) {
-  .quality-intro {
-    grid-template-columns: 1fr;
-    gap: var(--sp-8);
-  }
-
-  .quality-copy .ds-section-title,
-  .quality-copy > p:not(.ds-eyebrow) {
-    max-width: 650px;
-  }
-
-  .quality-visual {
-    width: min(100%, 720px);
-  }
-}
-
-@media (max-width: 680px) {
-  .quality-controls {
-    grid-template-columns: repeat(2, minmax(0, 1fr));
-    gap: var(--sp-2);
-  }
-
-  .quality-control + .quality-control .quality-control-content {
-    border-left: 1px solid var(--quality-line);
-  }
-
-  .quality-control-content {
-    padding: var(--sp-4) var(--sp-3);
-  }
-
-  .quality-control-name {
-    font-size: 13px;
-  }
-
-  .quality-control-target strong {
-    font-size: 28px;
-  }
-
-  .quality-visual-label {
-    padding: var(--sp-3);
-    font-size: 9px;
-  }
-
-  .quality-report {
-    grid-template-columns: 1fr;
-    gap: var(--sp-4);
-    min-height: 350px;
-  }
-}
-
-@media (max-width: 360px) {
-  .quality-control-content {
-    padding-inline: var(--sp-2);
-  }
-
-  .quality-control-name {
-    font-size: 12px;
-  }
-}
-
-@media (prefers-reduced-motion: reduce) {
-  .quality-layer,
-  .quality-control-content {
-    transition: none;
-  }
-}
-
 /* Navegação entre páginas (app/template.tsx liga as transições de visualização do React): a página atual
    recua e desfoca, a nova chega de baixo. O cabeçalho tem nome próprio e fica parado durante a troca. */
 .site-header {

lib/device.paths.test.ts

@@ -0,0 +1,185 @@
+import { readFileSync } from "node:fs";
+import { join } from "node:path";
+import ts from "typescript";
+import {
+  isCoarsePointer,
+  isLowPowerDevice,
+  isMobileViewport,
+  isSaveData,
+  prefersReducedMotion,
+} from "./device";
+
+/**
+ * Testes de caminhos-base de lib/device.ts (complemento de device.test.ts): matches() sem matchMedia,
+ * cada condição de isLowPowerDevice isolada (inclusive os limites), isSaveData e o ambiente sem window/navigator
+ * (servidor). O servidor é simulado transpilando o fonte e executando-o com `window` e `navigator` indefinidos,
+ * porque o jsdom não deixa esconder esses globais.
+ */
+
+type DeviceModule = typeof import("./device");
+
+const originalMatchMedia = window.matchMedia;
+
+function mockMedia(active: string[]) {
+  window.matchMedia = jest.fn().mockImplementation((query: string) => ({
+    matches: active.includes(query),
+    media: query,
+    addEventListener() {},
+    removeEventListener() {},
+  }));
+}
+
+function mockNavigator(values: Record<string, unknown>) {
+  for (const [key, value] of Object.entries(values))
+    Object.defineProperty(navigator, key, { configurable: true, value });
+}
+
+function loadOnServer(globals: { window?: unknown; navigator?: unknown }) {
+  const source = readFileSync(join(process.cwd(), "lib/device.ts"), "utf8");
+  const { outputText } = ts.transpileModule(source, {
+    compilerOptions: { module: ts.ModuleKind.CommonJS },
+  });
+  const loaded = { exports: {} as DeviceModule };
+  new Function("module", "exports", "window", "navigator", outputText)(
+    loaded,
+    loaded.exports,
+    globals.window,
+    globals.navigator,
+  );
+  return loaded.exports;
+}
+
+beforeEach(() => {
+  mockMedia([]);
+  mockNavigator({
+    hardwareConcurrency: 8,
+    deviceMemory: undefined,
+    connection: undefined,
+  });
+});
+
+afterEach(() => {
+  window.matchMedia = originalMatchMedia;
+});
+
+describe("matches() (through the media helpers)", () => {
+  it("path: matchMedia is not available -> every media hint is false", () => {
+    // @ts-expect-error simula um navegador sem matchMedia
+    window.matchMedia = undefined;
+
+    expect(isCoarsePointer()).toBe(false);
+    expect(prefersReducedMotion()).toBe(false);
+    expect(isMobileViewport()).toBe(false);
+    expect(isLowPowerDevice()).toBe(false);
+  });
+
+  it("path: matchMedia answers false for the query -> false", () => {
+    expect(isCoarsePointer()).toBe(false);
+  });
+
+  it("path: matchMedia answers true only for the asked query -> only that hint is true", () => {
+    mockMedia(["(prefers-reduced-motion: reduce)"]);
+
+    expect(prefersReducedMotion()).toBe(true);
+    expect(isCoarsePointer()).toBe(false);
+    expect(isMobileViewport()).toBe(false);
+  });
+});
+
+describe("isSaveData()", () => {
+  it.each([
+    ["connection is missing", undefined],
+    ["connection has no saveData", {}],
+    ["saveData is false", { saveData: false }],
+    ["saveData is a truthy non-boolean", { saveData: "true" }],
+  ])("path: %s -> false", (_label, connection) => {
+    mockNavigator({ connection });
+
+    expect(isSaveData()).toBe(false);
+  });
+
+  it("path: saveData is exactly true -> true", () => {
+    mockNavigator({ connection: { saveData: true } });
+
+    expect(isSaveData()).toBe(true);
+  });
+});
+
+describe("isLowPowerDevice(): limites de cada condição, uma de cada vez", () => {
+  it.each([
+    ["5 cores", { hardwareConcurrency: 5 }],
+    ["8 GB of memory", { hardwareConcurrency: 8, deviceMemory: 8 }],
+    ["5 GB of memory", { hardwareConcurrency: 8, deviceMemory: 5 }],
+    ["cores reported as text", { hardwareConcurrency: "2" }],
+    ["memory reported as text", { deviceMemory: "2" }],
+    ["cores reported as null", { hardwareConcurrency: null }],
+  ])(
+    "path: %s -> full power (just above the limit or not a number)",
+    (_label, hints) => {
+      mockNavigator(hints);
+
+      expect(isLowPowerDevice()).toBe(false);
+    },
+  );
+
+  it.each([
+    ["exactly 4 cores", { hardwareConcurrency: 4 }],
+    ["exactly 4 GB", { deviceMemory: 4 }],
+    ["0.5 GB", { deviceMemory: 0.5 }],
+    ["1 core", { hardwareConcurrency: 1 }],
+  ])("path: %s -> low power", (_label, hints) => {
+    mockNavigator(hints);
+
+    expect(isLowPowerDevice()).toBe(true);
+  });
+
+  it("path: only the first condition is true (touch) -> low power without reading the rest", () => {
+    mockMedia(["(pointer: coarse)"]);
+    mockNavigator({ hardwareConcurrency: 16, deviceMemory: 16 });
+
+    expect(isLowPowerDevice()).toBe(true);
+  });
+
+  it("path: several conditions true at once -> still just true", () => {
+    mockMedia(["(pointer: coarse)", "(prefers-reduced-motion: reduce)"]);
+    mockNavigator({
+      hardwareConcurrency: 2,
+      deviceMemory: 2,
+      connection: { saveData: true },
+    });
+
+    expect(isLowPowerDevice()).toBe(true);
+  });
+});
+
+describe("without window and navigator (server)", () => {
+  it("path: no window -> media hints are false", () => {
+    const device = loadOnServer({ window: undefined, navigator: undefined });
+
+    expect(device.isCoarsePointer()).toBe(false);
+    expect(device.prefersReducedMotion()).toBe(false);
+    expect(device.isMobileViewport()).toBe(false);
+  });
+
+  it("path: no navigator -> save data is off and the device counts as low power", () => {
+    const device = loadOnServer({ window: undefined, navigator: undefined });
+
+    expect(device.isSaveData()).toBe(false);
+    expect(device.isLowPowerDevice()).toBe(true);
+  });
+
+  it("path: a navigator without window (runtime that exposes only navigator) -> hints still read", () => {
+    const device = loadOnServer({
+      window: undefined,
+      navigator: { hardwareConcurrency: 16, connection: { saveData: true } },
+    });
+
+    expect(device.isSaveData()).toBe(true);
+    expect(device.isLowPowerDevice()).toBe(true);
+    const capable = loadOnServer({
+      window: undefined,
+      navigator: { hardwareConcurrency: 16 },
+    });
+    expect(capable.isLowPowerDevice()).toBe(false);
+  });
+});

lib/device.test.ts

@@ -0,0 +1,74 @@
+import {
+  isCoarsePointer,
+  isLowPowerDevice,
+  isMobileViewport,
+  isSaveData,
+  MOBILE_QUERY,
+} from "./device";
+
+const originalMatchMedia = window.matchMedia;
+
+function mockMedia(active: string[]) {
+  window.matchMedia = jest.fn().mockImplementation((query: string) => ({
+    matches: active.includes(query),
+    media: query,
+    addEventListener() {},
+    removeEventListener() {},
+  }));
+}
+
+function mockNavigator(values: Record<string, unknown>) {
+  for (const [key, value] of Object.entries(values))
+    Object.defineProperty(navigator, key, { configurable: true, value });
+}
+
+beforeEach(() => {
+  mockMedia([]);
+  mockNavigator({
+    hardwareConcurrency: 8,
+    deviceMemory: undefined,
+    connection: undefined,
+  });
+});
+
+afterEach(() => {
+  window.matchMedia = originalMatchMedia;
+});
+
+describe("device hints", () => {
+  it("treats a capable desktop as full power", () => {
+    expect(isLowPowerDevice()).toBe(false);
+    expect(isCoarsePointer()).toBe(false);
+    expect(isSaveData()).toBe(false);
+    expect(isMobileViewport()).toBe(false);
+  });
+
+  it("reads the phone breakpoint from the shared query", () => {
+    mockMedia([MOBILE_QUERY]);
+    expect(isMobileViewport()).toBe(true);
+    expect(MOBILE_QUERY).toBe("(max-width: 767px)");
+  });
+
+  it.each([
+    ["a touch pointer", () => mockMedia(["(pointer: coarse)"])],
+    ["reduced motion", () => mockMedia(["(prefers-reduced-motion: reduce)"])],
+    ["the data saver", () => mockNavigator({ connection: { saveData: true } })],
+    ["four cores", () => mockNavigator({ hardwareConcurrency: 4 })],
+    ["two cores", () => mockNavigator({ hardwareConcurrency: 2 })],
+    ["4 GB of memory", () => mockNavigator({ deviceMemory: 4 })],
+    ["2 GB of memory", () => mockNavigator({ deviceMemory: 2 })],
+  ])("is low power with %s", (_label, arrange) => {
+    arrange();
+    expect(isLowPowerDevice()).toBe(true);
+  });
+
+  it("does not penalize a browser that hides the hardware hints", () => {
+    mockNavigator({ hardwareConcurrency: undefined, deviceMemory: undefined });
+    expect(isLowPowerDevice()).toBe(false);
+  });
+
+  it("keeps 8 GB and 6 cores on the full path", () => {
+    mockNavigator({ hardwareConcurrency: 6, deviceMemory: 8 });
+    expect(isLowPowerDevice()).toBe(false);
+  });
+});

lib/device.ts

@@ -0,0 +1,53 @@
+/**
+ * Leituras do aparelho que decidem o que a página carrega e anima: ponteiro de toque, pouca CPU ou memória,
+ * "economizar dados" e largura de celular. Tudo roda só no navegador (no servidor, devolve o valor mais leve).
+ */
+
+/** Abaixo disto (px) a página usa as versões de celular dos vídeos e capas. */
+export const MOBILE_MAX_WIDTH = 767;
+export const MOBILE_QUERY = `(max-width: ${MOBILE_MAX_WIDTH}px)`;
+
+type NavigatorHints = Navigator & {
+  deviceMemory?: number;
+  connection?: { saveData?: boolean };
+};
+
+function matches(query: string) {
+  return (
+    typeof window !== "undefined" &&
+    typeof window.matchMedia === "function" &&
+    window.matchMedia(query).matches
+  );
+}
+
+/** Ponteiro principal impreciso (dedo): sem rolagem suavizada nem cena 3D. */
+export const isCoarsePointer = () => matches("(pointer: coarse)");
+
+export const prefersReducedMotion = () =>
+  matches("(prefers-reduced-motion: reduce)");
+
+/** Tela de celular: abaixo de 768 px. */
+export const isMobileViewport = () => matches(MOBILE_QUERY);
+
+/** "Economizar dados" ligado: só imagens, nenhum vídeo é baixado sozinho. */
+export function isSaveData() {
+  if (typeof navigator === "undefined") return false;
+  return (navigator as NavigatorHints).connection?.saveData === true;
+}
+
+/**
+ * Aparelho que não deve montar WebGL: toque, 4 núcleos ou menos, 4 GB de memória ou menos, economia de dados
+ * ou movimento reduzido. O que não é informado pelo navegador (Safari, Firefox) não conta contra o aparelho.
+ */
+export function isLowPowerDevice() {
+  if (typeof navigator === "undefined") return true;
+  const hints = navigator as NavigatorHints;
+  return (
+    isCoarsePointer() ||
+    prefersReducedMotion() ||
+    isSaveData() ||
+    (typeof hints.hardwareConcurrency === "number" &&
+      hints.hardwareConcurrency <= 4) ||
+    (typeof hints.deviceMemory === "number" && hints.deviceMemory <= 4)
+  );
+}

lib/project-showcase.paths.test.ts

@@ -0,0 +1,199 @@
+import {
+  chapterAnchors,
+  chapterFraction,
+  chapterIndexAt,
+  desktopFractionAt,
+  getProjectVideo,
+  getShowcaseAssets,
+  mobileFractionAt,
+  SHOWCASE,
+  type ShowcaseConfig,
+} from "./project-showcase";
+
+/**
+ * Testes de caminhos-base de lib/project-showcase.ts (complemento de project-showcase.test.ts):
+ * getProjectVideo (id da vitrine x id fora dela x chaves herdadas de Object, nos dois aparelhos) e os trechos
+ * de chapterAnchors/interpolate/chapterFraction que o arquivo principal não exercita.
+ */
+
+function config(
+  chapters: ShowcaseConfig["chapters"],
+  durations = { desktop: 10, mobile: 20 },
+): ShowcaseConfig {
+  return { id: "fixture", accent: "#fff", durations, weight: 1, chapters };
+}
+
+describe("getProjectVideo", () => {
+  it.each(SHOWCASE.map(({ id }) => id))(
+    "path: showcase project %s -> assets for the requested device",
+    (id) => {
+      expect(getProjectVideo(id, "desktop")).toEqual(
+        getShowcaseAssets(id, "desktop"),
+      );
+      expect(getProjectVideo(id, "mobile")).toEqual(
+        getShowcaseAssets(id, "mobile"),
+      );
+      expect(getProjectVideo(id)).toEqual(getShowcaseAssets(id, "desktop"));
+    },
+  );
+
+  it.each([
+    "",
+    "nao-existe",
+    "constructor",
+    "__proto__",
+    "toString",
+    "SEV-MODAINTIMA",
+  ])(
+    "path: id %j is not a showcase project -> undefined for both devices",
+    (id) => {
+      expect(getProjectVideo(id)).toBeUndefined();
+      expect(getProjectVideo(id, "mobile")).toBeUndefined();
+    },
+  );
+
+  it("path: the two devices differ in size and in poster, not in the project folder", () => {
+    const desktop = getProjectVideo("nutriscan", "desktop");
+    const mobile = getProjectVideo("nutriscan", "mobile");
+
+    expect(desktop).toMatchObject({ width: 1440, height: 900 });
+    expect(mobile).toMatchObject({ width: 390, height: 844 });
+    expect(desktop?.poster).toBe("/videos/nutriscan/desktop.webp");
+    expect(mobile?.poster).toBe("/videos/nutriscan/mobile.webp");
+  });
+});
+
+describe("chapterAnchors", () => {
+  it("path: chapters that advance on both videos -> one anchor each between [0,0] and [1,1]", () => {
+    const anchors = chapterAnchors(
+      config([
+        { label: "A", desktop: 2, mobile: 4 },
+        { label: "B", desktop: 5, mobile: 10 },
+      ]),
+    );
+
+    expect(anchors).toEqual([
+      [0, 0],
+      [0.2, 0.2],
+      [0.5, 0.5],
+      [1, 1],
+    ]);
+  });
+
+  it("path: a chapter at second 0 on both videos -> no duplicate of the origin", () => {
+    const anchors = chapterAnchors(
+      config([
+        { label: "Abertura", desktop: 0, mobile: 0 },
+        { label: "B", desktop: 5, mobile: 10 },
+      ]),
+    );
+
+    expect(anchors).toEqual([
+      [0, 0],
+      [0.5, 0.5],
+      [1, 1],
+    ]);
+  });
+
+  it("path: a chapter that does not advance on the desktop video -> skipped", () => {
+    const anchors = chapterAnchors(
+      config([
+        { label: "A", desktop: 4, mobile: 4 },
+        { label: "B", desktop: 4, mobile: 12 },
+      ]),
+    );
+
+    expect(anchors).toEqual([
+      [0, 0],
+      [0.4, 0.2],
+      [1, 1],
+    ]);
+  });
+
+  it("path: a chapter that does not advance on the mobile video -> skipped", () => {
+    const anchors = chapterAnchors(
+      config([
+        { label: "A", desktop: 4, mobile: 10 },
+        { label: "B", desktop: 8, mobile: 10 },
+      ]),
+    );
+
+    expect(anchors).toEqual([
+      [0, 0],
+      [0.4, 0.5],
+      [1, 1],
+    ]);
+  });
+});
+
+describe("mobileFractionAt / desktopFractionAt (interpolation)", () => {
+  const sample = config([
+    { label: "A", desktop: 2, mobile: 10 },
+    { label: "B", desktop: 8, mobile: 15 },
+  ]);
+
+  it.each([
+    [-1, 0],
+    [0, 0],
+    [0.2, 0.5],
+    [0.5, 0.5 + (0.3 / 0.6) * 0.25],
+    [0.8, 0.75],
+    [1, 1],
+    [2, 1],
+  ])(
+    "path: desktop fraction %f -> mobile fraction %f",
+    (fraction, expected) => {
+      expect(mobileFractionAt(sample, fraction)).toBeCloseTo(expected, 9);
+    },
+  );
+
+  it("path: desktopFractionAt is the inverse on the anchors", () => {
+    expect(desktopFractionAt(sample, 0.5)).toBeCloseTo(0.2, 9);
+    expect(desktopFractionAt(sample, 0.75)).toBeCloseTo(0.8, 9);
+    expect(desktopFractionAt(sample, 0)).toBe(0);
+    expect(desktopFractionAt(sample, 1)).toBe(1);
+  });
+
+  it("path: a chapter right at the end makes a zero-length span -> no division by zero", () => {
+    const flat = config([{ label: "Fim", desktop: 10, mobile: 20 }]);
+
+    expect(mobileFractionAt(flat, 1)).toBe(1);
+    expect(Number.isFinite(mobileFractionAt(flat, 0.999))).toBe(true);
+    expect(Number.isFinite(desktopFractionAt(flat, 1))).toBe(true);
+  });
+});
+
+describe("chapterIndexAt / chapterFraction", () => {
+  const sample = config([
+    { label: "A", desktop: 0, mobile: 0 },
+    { label: "B", desktop: 4, mobile: 8 },
+    { label: "C", desktop: 8, mobile: 16 },
+  ]);
+
+  it.each([
+    [-5, 0],
+    [0, 0],
+    [0.399, 0],
+    [0.4, 1],
+    [0.7999, 1],
+    [0.8, 2],
+    [1, 2],
+    [9, 2],
+  ])("path: fraction %f -> chapter %i", (fraction, expected) => {
+    expect(chapterIndexAt(sample, fraction)).toBe(expected);
+  });
+
+  it("path: chapter index in range -> start fraction on each video", () => {
+    expect(chapterFraction(sample, 1, "desktop")).toBeCloseTo(0.4, 9);
+    expect(chapterFraction(sample, 1, "mobile")).toBeCloseTo(0.4, 9);
+    expect(chapterFraction(sample, 2, "desktop")).toBeCloseTo(0.8, 9);
+  });
+
+  it.each([-1, 3, 99])(
+    "path: chapter index %i does not exist -> 0",
+    (index) => {
+      expect(chapterFraction(sample, index, "desktop")).toBe(0);
+      expect(chapterFraction(sample, index, "mobile")).toBe(0);
+    },
+  );
+});

lib/project-showcase.test.ts

@@ -9,6 +9,7 @@ import {
   getProjectVideo,
   getScrubSource,
   getShowcaseAssets,
+  MAX_CHAPTERS,
   mobileFractionAt,
   PROJECT_VIDEO_IDS,
   SHOWCASE,
@@ -16,6 +17,34 @@ import {
 
 const MAX_BYTES = 3 * 1024 * 1024;
 const publicFile = (path: string) => join(process.cwd(), "public", path);
+/** Os projetos de cliente que a home entrega à vitrine. */
+const HOME_IDS = ["sev-modaintima", "lavacao-047", "sc-plus", "as-servicos"];
+
+describe("showcase length", () => {
+  it.each(SHOWCASE)("$id has at most three chapters", (config) => {
+    expect(MAX_CHAPTERS).toBe(3);
+    expect(config.chapters.length).toBeLessThanOrEqual(MAX_CHAPTERS);
+    expect(config.chapters.length).toBeGreaterThanOrEqual(1);
+  });
+
+  it("pins the four home projects for about three and a half screens at most", () => {
+    const total = SHOWCASE.filter((config) => HOME_IDS.includes(config.id))
+      .map((config) => config.weight)
+      .reduce((sum, weight) => sum + weight, 0);
+    expect(HOME_IDS.every((id) => SHOWCASE.some((c) => c.id === id))).toBe(
+      true,
+    );
+    expect(total).toBeLessThanOrEqual(3.5);
+    expect(total).toBeGreaterThan(2);
+  });
+
+  it("keeps the NutriScan configuration for /cases", () => {
+    const nutriscan = SHOWCASE.find((config) => config.id === "nutriscan");
+    expect(nutriscan).toBeDefined();
+    expect(PROJECT_VIDEO_IDS).toContain("nutriscan");
+    expect(getOgImagePath("nutriscan")).toBe("/videos/nutriscan/og.jpg");
+  });
+});
 
 describe("showcase chapters", () => {
   it.each(SHOWCASE)("$id has ordered chapters inside both videos", (config) => {
@@ -60,8 +89,9 @@ describe("showcase chapters", () => {
     expect(lavacao).toBeDefined();
     if (!lavacao) return;
     expect(chapterIndexAt(lavacao, 0)).toBe(0);
-    expect(chapterIndexAt(lavacao, 3 / lavacao.durations.desktop)).toBe(1);
-    expect(chapterIndexAt(lavacao, 10 / lavacao.durations.desktop)).toBe(2);
+    expect(chapterIndexAt(lavacao, 3 / lavacao.durations.desktop)).toBe(0);
+    expect(chapterIndexAt(lavacao, 10 / lavacao.durations.desktop)).toBe(1);
+    expect(chapterIndexAt(lavacao, 25 / lavacao.durations.desktop)).toBe(2);
     expect(chapterIndexAt(lavacao, 1)).toBe(lavacao.chapters.length - 1);
     expect(chapterIndexAt(lavacao, 2)).toBe(lavacao.chapters.length - 1);
     expect(chapterIndexAt(lavacao, -1)).toBe(0);
@@ -71,6 +101,22 @@ describe("showcase chapters", () => {
 describe("showcase assets", () => {
   it("returns undefined for projects without a recorded video", () => {
     expect(getProjectVideo("reddit-explorer")).toBeUndefined();
+    expect(getProjectVideo("reddit-explorer", "mobile")).toBeUndefined();
+  });
+
+  it("picks the version for the device, desktop by default", () => {
+    expect(getProjectVideo("nutriscan")?.poster).toBe(
+      "/videos/nutriscan/desktop.webp",
+    );
+    expect(getProjectVideo("nutriscan", "desktop")).toEqual(
+      getShowcaseAssets("nutriscan", "desktop"),
+    );
+    const mobile = getProjectVideo("nutriscan", "mobile");
+    expect(mobile?.poster).toBe("/videos/nutriscan/mobile.webp");
+    expect(mobile?.sources.map((source) => source.src)).toEqual([
+      "/videos/nutriscan/mobile.webm",
+      "/videos/nutriscan/mobile.mp4",
+    ]);
   });
 
   it.each(PROJECT_VIDEO_IDS)(

lib/project-showcase.ts

@@ -2,6 +2,7 @@
  * Vitrine dos projetos: tudo o que os cards, a vitrine animada e a janela ampliada sabem sobre os vídeos.
  *
  * Arquivos em public/videos/<id>/ (gravados com scripts/record-project-videos.mjs):
+ * - desktop.webp e mobile.webp: pôsteres; a versão de celular vale abaixo de 768 px (lib/device.ts);
  * - desktop.{webm,mp4,webp} e mobile.{webm,mp4,webp}: reprodução normal, até 3 MB cada vídeo;
  * - scrub-desktop.mp4 e scrub-mobile.mp4: mesmos vídeos com um quadro-chave a cada 6 quadros, para a imagem
  *   acompanhar a rolagem sem travar quando o tempo é mudado a cada quadro;
@@ -27,18 +28,24 @@ export interface ShowcaseConfig {
   chapters: readonly ShowcaseChapter[];
 }
 
-/** Ordem da vitrine = ordem dos cards na home. Capítulos marcados nos quadros dos próprios vídeos. */
+/** Máximo de capítulos por projeto na vitrine: três marcas bastam para situar o visitante sem virar índice. */
+export const MAX_CHAPTERS = 3;
+
+/**
+ * Ordem da vitrine = ordem do SHOWCASE para os projetos que o provedor recebe. Capítulos marcados nos quadros
+ * dos próprios vídeos, no máximo MAX_CHAPTERS por projeto (os mais representativos, com os tempos originais).
+ * O peso soma cerca de 3,5 alturas de tela para os quatro projetos de cliente da home (sev-modaintima,
+ * lavacao-047, sc-plus e as-servicos): a vitrine inteira prende pouco a rolagem.
+ */
 export const SHOWCASE: readonly ShowcaseConfig[] = [
   {
     id: "sev-modaintima",
     accent: "#c2303a",
     durations: { desktop: 17.9, mobile: 30.1 },
-    weight: 1,
+    weight: 0.95,
     chapters: [
       { label: "Abertura", desktop: 0, mobile: 0 },
-      { label: "Categorias", desktop: 2.7, mobile: 1.9 },
       { label: "As favoritas", desktop: 7.2, mobile: 5.6 },
-      { label: "Nossa essência", desktop: 10.7, mobile: 8.6 },
       { label: "Coleção completa", desktop: 13.4, mobile: 11 },
     ],
   },
@@ -46,24 +53,21 @@ export const SHOWCASE: readonly ShowcaseConfig[] = [
     id: "lavacao-047",
     accent: "#4aa3ff",
     durations: { desktop: 30.07, mobile: 30.1 },
-    weight: 1.4,
+    weight: 1.1,
     chapters: [
       { label: "Abertura", desktop: 0, mobile: 0 },
-      { label: "Tabela de preços", desktop: 1.5, mobile: 1.9 },
       { label: "Do sujo ao brilho", desktop: 5.5, mobile: 5.6 },
-      { label: "Como funciona", desktop: 13.5, mobile: 13.2 },
-      { label: "Galeria e mapa", desktop: 18.5, mobile: 17.5 },
       { label: "Perguntas e contato", desktop: 24, mobile: 22 },
     ],
   },
   {
+    // fora da home atual, mas usado em /cases (og-card): a configuração fica
     id: "nutriscan",
     accent: "#2f9e5f",
     durations: { desktop: 15.67, mobile: 26.4 },
-    weight: 0.9,
+    weight: 0.8,
     chapters: [
       { label: "Busca", desktop: 0, mobile: 0 },
-      { label: "Por que confiar", desktop: 2.3, mobile: 3 },
       { label: "Quatro etapas", desktop: 7, mobile: 8 },
       { label: "Apoio ao projeto", desktop: 10.9, mobile: 16.3 },
     ],
@@ -72,12 +76,10 @@ export const SHOWCASE: readonly ShowcaseConfig[] = [
     id: "sc-plus",
     accent: "#22c55e",
     durations: { desktop: 13, mobile: 19.67 },
-    weight: 0.85,
+    weight: 0.8,
     chapters: [
       { label: "Abertura", desktop: 0, mobile: 0 },
-      { label: "Sobre", desktop: 1.5, mobile: 2.2 },
       { label: "Áreas e projetos", desktop: 3.8, mobile: 4.6 },
-      { label: "Apoiadores e participação", desktop: 7.5, mobile: 12.8 },
       { label: "Contato", desktop: 10.4, mobile: 16.9 },
     ],
   },
@@ -132,9 +134,12 @@ export function getOgImagePath(id: string) {
   return `/videos/${id}/og.jpg`;
 }
 
-/** Vídeo desktop de um projeto da vitrine: é o que as capas dos cards tocam. */
-export function getProjectVideo(id: string): ShowcaseAssets | undefined {
-  return byId.has(id) ? getShowcaseAssets(id, "desktop") : undefined;
+/** Arquivos de um projeto da vitrine para o aparelho (desktop por padrão): é o que as capas dos cards usam. */
+export function getProjectVideo(
+  id: string,
+  device: Device = "desktop",
+): ShowcaseAssets | undefined {
+  return byId.has(id) ? getShowcaseAssets(id, device) : undefined;
 }
 
 // ---------------------------------------------------------------------------------------------------------