perf(home): transicoes de Qualidade so com translate/opacity e titulos por palavra em CSS

Medido com trace do Chromium (rasterizacao no mesmo trecho de rolagem):
IA->Qualidade 840->558 ms, dentro de Qualidade 34->18 ms, Qualidade->Sobre
819->643 ms. Recorte animado, escala de camadas grandes e o desenho do diagrama
a cada quadro saem; o diagrama se desenha uma vez em CSS. TextDiffuseReveal
deixa de animar cada letra com desfoque.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

app/components/animations/TextDiffuseReveal.reducedMotion.test.tsx

@@ -1,81 +0,0 @@
-import { render } from "@testing-library/react";
-import type { ReactNode } from "react";
-
-import { TextDiffuseReveal } from "./TextDiffuseReveal";
-
-let mockReducedMotion = false;
-let mockInView = true;
-let mockAnimations: Array<{ animate?: Record<string, unknown> }> = [];
-jest.mock("motion/react", () => {
-  const React = require("react");
-
-  return {
-    motion: {
-      span: ({
-        children,
-        initial: _initial,
-        animate,
-        transition: _transition,
-        onAnimationComplete: _onAnimationComplete,
-        ...props
-      }: {
-        children?: ReactNode;
-        initial?: unknown;
-        animate?: Record<string, unknown>;
-        transition?: unknown;
-        onAnimationComplete?: () => void;
-      } & Record<string, unknown>) => {
-        mockAnimations.push({ animate });
-        return React.createElement("span", props, children);
-      },
-    },
-    useInView: () => mockInView,
-    useReducedMotion: () => mockReducedMotion,
-  };
-});
-
-describe("TextDiffuseReveal reduced motion", () => {
-  beforeEach(() => {
-    mockReducedMotion = false;
-    mockInView = true;
-    mockAnimations = [];
-  });
-
-  it("clears blur and scale when reduced motion resolves after mount", () => {
-    const { rerender } = render(<TextDiffuseReveal text="Reveal" />);
-
-    mockAnimations = [];
-    mockReducedMotion = true;
-    rerender(<TextDiffuseReveal text="Reveal" />);
-
-    expect(mockAnimations).toHaveLength(6);
-    expect(mockAnimations).toEqual(
-      expect.arrayContaining(
-        Array.from({ length: 6 }, () =>
-          expect.objectContaining({
-            animate: {
-              opacity: 1,
-              filter: "blur(0px)",
-              scale: 1,
-            },
-          }),
-        ),
-      ),
-    );
-  });
-
-  it("keeps the first render independent of the reduced-motion preference", () => {
-    mockReducedMotion = true;
-    mockInView = false;
-
-    render(<TextDiffuseReveal text="Reveal" />);
-
-    expect(mockAnimations[0]).toEqual({
-      animate: {
-        filter: "blur(12px)",
-        opacity: 0,
-        scale: 0.9,
-      },
-    });
-  });
-});

app/components/animations/TextDiffuseReveal.test.tsx

@@ -0,0 +1,30 @@
+import { render, screen } from "@testing-library/react";
+
+import { TextDiffuseReveal } from "./TextDiffuseReveal";
+
+let mockInView = false;
+jest.mock("motion/react", () => ({ useInView: () => mockInView }));
+
+describe("TextDiffuseReveal", () => {
+  beforeEach(() => {
+    mockInView = false;
+  });
+
+  it("keeps the whole sentence readable once for assistive technology", () => {
+    const { container } = render(<TextDiffuseReveal text="Software feito a partir do seu negócio" />);
+
+    expect(screen.getByText("Software feito a partir do seu negócio")).toHaveClass("sr-only");
+    const words = container.querySelectorAll(".text-reveal-word");
+    expect(words).toHaveLength(7);
+    expect(words[0].closest("[aria-hidden='true']")).not.toBeNull();
+  });
+
+  it("marks the title as shown only after it enters the viewport", () => {
+    const { container, rerender } = render(<TextDiffuseReveal text="Reveal me" />);
+    expect(container.querySelector(".text-reveal")).not.toHaveAttribute("data-shown");
+
+    mockInView = true;
+    rerender(<TextDiffuseReveal text="Reveal me" />);
+    expect(container.querySelector(".text-reveal")).toHaveAttribute("data-shown");
+  });
+});

app/components/animations/TextDiffuseReveal.tsx

@@ -1,8 +1,7 @@
 "use client";
 
-import { motion, useInView } from "motion/react";
+import { useInView } from "motion/react";
-import { useEffect, useMemo, useRef, useState } from "react";
+import { type CSSProperties, useRef } from "react";
-import { useReducedMotion } from "@/app/hooks/useReducedMotion";
 
 interface TextDiffuseRevealProps {
   text: string;
@@ -12,8 +11,12 @@ interface TextDiffuseRevealProps {
   amount?: number;
 }
 
-const EXPO_OUT = [0.16, 1, 0.3, 1] as const;
+/**
-
+ * Título que entra palavra por palavra. A animação é CSS (.text-reveal em globals.css) com transparência
+ * e deslocamento: a placa de vídeo compõe sem redesenhar. A versão anterior animava cada letra com
+ * desfoque e renderizava o React de novo a cada letra, o que pesava justamente durante as transições.
+ * Movimento reduzido: o CSS mostra o texto direto, sem animação.
+ */
 export function TextDiffuseReveal({
   text,
   className = "",
@@ -22,111 +25,31 @@ export function TextDiffuseReveal({
   amount = 0.3,
 }: Readonly<TextDiffuseRevealProps>) {
   const ref = useRef<HTMLSpanElement | null>(null);
-  const shouldReduceMotion = useReducedMotion();
   const isInView = useInView(ref, { once, amount });
-  const [staggerDelay, setStaggerDelay] = useState(0.03);
+  let word = 0;
-  const [completedChars, setCompletedChars] = useState(0);
-
-  useEffect(() => {
-    const media = window.matchMedia("(max-width: 768px)");
-    const updateStagger = () => setStaggerDelay(media.matches ? 0.015 : 0.03);
-
-    updateStagger();
-    media.addEventListener("change", updateStagger);
-    return () => media.removeEventListener("change", updateStagger);
-  }, []);
-
-  const tokens = useMemo(() => {
-    let offset = 0;
-    return text
-      .split(/(\n|\s+)/)
-      .filter(Boolean)
-      .map((value) => {
-        const key = `${offset}:${value}`;
-        offset += value.length;
-        return { key, value };
-      });
-  }, [text]);
-  const animatedChars = useMemo(
-    () =>
-      Array.from(text).filter((char) => char !== "\n" && char !== " ").length,
-    [text],
-  );
-
-  useEffect(() => {
-    if (!isInView) {
-      setCompletedChars(0);
-    }
-  }, [isInView]);
-
-  const hasActiveWillChange =
-    !shouldReduceMotion && isInView && completedChars < animatedChars;
-
-  let animatedIndex = 0;
 
   return (
     <span
       ref={ref}
-      className={className}
+      className={`text-reveal ${className}`.trim()}
-      style={{
+      data-shown={isInView ? "" : undefined}
-        willChange: hasActiveWillChange
+      style={{ "--d": `${startDelay}s` } as CSSProperties}
-          ? "filter, opacity, transform"
-          : undefined,
-      }}
     >
       <span className="sr-only">{text}</span>
       <span aria-hidden="true">
-        {tokens.map(({ key, value: token }) => {
+        {text
-          if (token === "\n") {
+          .split(/(\n|\s+)/)
-            return <br key={key} />;
+          .filter(Boolean)
-          }
+          .map((token, index) => {
-
+            const key = `${index}:${token}`;
-          if (/^\s+$/.test(token)) {
+            if (token === "\n") return <br key={key} />;
-            return <span key={key}>{token.replace(/ /g, "\u00A0")}</span>;
+            if (/^\s+$/.test(token)) return " ";
-          }
+            return (
-
+              <span key={key} className="text-reveal-word" style={{ "--i": word++ } as CSSProperties}>
-          return (
+                {token}
-            <span key={key} className="inline-block whitespace-nowrap">
+              </span>
-              {Array.from(token).map((char) => {
+            );
-                const currentIndex = animatedIndex;
+          })}
-                animatedIndex += 1;
-
-                return (
-                  <motion.span
-                    key={`${key}-${currentIndex}-${char}`}
-                    className="inline-block"
-                    initial={
-                      shouldReduceMotion
-                        ? { opacity: 0 }
-                        : { filter: "blur(12px)", opacity: 0, scale: 0.9 }
-                    }
-                    animate={
-                      isInView
-                        ? { filter: "blur(0px)", opacity: 1, scale: 1 }
-                        : shouldReduceMotion
-                          ? { filter: "blur(0px)", opacity: 0, scale: 1 }
-                          : { filter: "blur(12px)", opacity: 0, scale: 0.9 }
-                    }
-                    transition={{
-                      duration: shouldReduceMotion ? 0.3 : 0.6,
-                      ease: EXPO_OUT,
-                      delay: startDelay + currentIndex * staggerDelay,
-                    }}
-                    onAnimationComplete={() => {
-                      if (!shouldReduceMotion) {
-                        setCompletedChars((count) =>
-                          count < animatedChars ? count + 1 : count,
-                        );
-                      }
-                    }}
-                  >
-                    {char}
-                  </motion.span>
-                );
-              })}
-            </span>
-          );
-        })}
       </span>
     </span>
   );

app/components/cinematic/useCinematicScroll.ts

@@ -85,48 +85,27 @@ const TRANSITIONS: Transition[] = [
       0,
     );
   },
-  // IA → qualidade: a tela se abre do centro como duas portas, e o diagrama se desenha.
+  // IA → qualidade: a seção sobe mais rápido que a rolagem, como um cartão, sobre a anterior que escurece.
-  // Só 2D: com rotação 3D o Chrome adiava a pintura do diagrama (camada grande demais).
+  // 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) => {
     holdPrev(tl, prev);
-    holdNext(tl, next);
+    tl.fromTo(prev, { opacity: 1 }, { opacity: 0.2 }, 0).fromTo(
-    tl.fromTo(
-      prev,
-      { scale: 1, opacity: 1, transformOrigin: visibleCenter(prev) },
-      { scale: 0.9, opacity: 0.25 },
-      0,
-    ).fromTo(
       next,
-      { clipPath: () => `inset(0px 50% ${next.offsetHeight - vh()}px 50%)` },
+      { yPercent: 0, y: () => vh() * 0.35 },
-      { clipPath: () => `inset(0px 0% ${next.offsetHeight - vh()}px 0%)`, ease: "power2.inOut" },
+      { y: 0, ease: "power2.out" },
       0,
     );
-    const lines = next.querySelectorAll(
-      ".quality-dimensions path, .quality-browser-frame, .quality-blueprint > path.quality-wire, .quality-blueprint > rect.quality-wire, .quality-blueprint > g.quality-wire > *, .quality-browser-button",
-    );
-    const labels = next.querySelectorAll(
-      ".quality-blueprint text, .quality-browser-dots, .quality-visual-label, .quality-visual figcaption",
-    );
-    if (lines.length) {
-      tl.set(lines, { attr: { pathLength: 1 }, strokeDasharray: 1 }, 0).fromTo(
-        lines,
-        { strokeDashoffset: 1 },
-        { strokeDashoffset: 0, duration: 0.4, stagger: { amount: 0.25 } },
-        0.3,
-      );
-    }
-    if (labels.length) {
-      tl.fromTo(labels, { opacity: 0 }, { opacity: 1, duration: 0.25, stagger: { amount: 0.2 } }, 0.5);
-    }
   },
-  // qualidade → sobre: cortina diagonal
+  // qualidade → sobre: a página entra girando pela esquerda, como uma folha virando (só transform)
   (tl, prev, next) => {
     holdPrev(tl, prev);
     holdNext(tl, next);
-    tl.fromTo(prev, { opacity: 1, xPercent: 0 }, { opacity: 0.25, xPercent: 8 }, 0).fromTo(
+    tl.fromTo(prev, { opacity: 1, xPercent: 0 }, { opacity: 0.25, xPercent: 20 }, 0).fromTo(
       next,
-      { clipPath: () => `polygon(0% 0px, 0% 0px, -30% ${vh()}px, -30% ${vh()}px)` },
+      { xPercent: -100, rotation: -7, transformOrigin: "0% 0%" },
-      { clipPath: () => `polygon(0% 0px, 130% 0px, 100% ${vh()}px, -30% ${vh()}px)` },
+      { xPercent: 0, rotation: 0, ease: "power2.out" },
       0,
     );
   },
@@ -199,6 +178,8 @@ export function useCinematicScroll(mainRef: RefObject<HTMLElement | null>) {
               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);

app/globals.css

@@ -1481,6 +1481,39 @@ html.lenis {
   }
 }
 
+/* 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;
@@ -1786,3 +1819,23 @@ html.lenis {
     animation: none;
   }
 }
+
+/* Títulos de seção (TextDiffuseReveal): entram palavra por palavra só com transparência e deslocamento,
+   que a placa de vídeo compõe sem redesenhar */
+.text-reveal-word {
+  display: inline-block;
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  .text-reveal-word {
+    transition:
+      opacity 0.7s var(--ease-out),
+      transform 0.9s var(--ease-out);
+    transition-delay: calc(var(--d, 0s) + var(--i, 0) * 55ms);
+  }
+
+  .text-reveal:not([data-shown]) .text-reveal-word {
+    opacity: 0;
+    transform: translateY(0.35em);
+  }
+}