Text Reveal on Scroll

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #070a12;
  --text: #f0f4fb;
  --muted: #8a95a8;
  --accent: #86e8ff;
  --neon-purple: #ae52ff;
}

html {
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", "SF Pro Display", system-ui, sans-serif;
}

body {
  overflow-x: hidden;
}

.section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
}

.hero-section {
  min-height: 80vh;
}

.content {
  max-width: 800px;
  width: 100%;
}

.label {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

h1,
h2 {
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1.5rem;
}

h1 {
  font-size: clamp(2.5rem, 7vw, 5.5rem);
  background: linear-gradient(135deg, #fff, var(--accent), var(--neon-purple));
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

h2 {
  font-size: clamp(2rem, 5vw, 4rem);
}

.split-sub {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--muted);
  max-width: 480px;
  line-height: 1.6;
}

p.split-lines {
  font-size: clamp(0.95rem, 1.8vw, 1.1rem);
  color: var(--muted);
  line-height: 1.7;
  max-width: 600px;
}

/* Quote section */
.section-quote {
  background: linear-gradient(135deg, rgba(174, 82, 255, 0.06), rgba(134, 232, 255, 0.04));
}

.quote-text {
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  font-weight: 600;
  font-style: italic;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--accent);
  border: none;
  max-width: 700px;
}

/* Back link */
.back-link {
  display: inline-block;
  margin-top: 2rem;
  padding: 0.7rem 2rem;
  border-radius: 999px;
  border: 1px solid rgba(134, 232, 255, 0.3);
  color: var(--accent);
  text-decoration: none;
  font: 600 0.85rem / 1 "Inter", system-ui, sans-serif;
  transition: all 0.25s ease;
}

.back-link:hover {
  background: rgba(134, 232, 255, 0.08);
  border-color: var(--accent);
}

/* SplitText char/word/line wrappers get these from GSAP */
.char,
.word,
.line {
  display: inline-block;
  will-change: transform, opacity;
}

/* Clip overflow on lines for reveal effect */
.line-wrapper {
  overflow: hidden;
  display: block;
}

/* Reduced motion */
.reduced-motion .char,
.reduced-motion .word,
.reduced-motion .line,
.reduced-motion h1,
.reduced-motion h2,
.reduced-motion p,
.reduced-motion blockquote,
.reduced-motion .label,
.reduced-motion .split-sub {
  opacity: 1 !important;
  transform: none !important;
}

@media (max-width: 640px) {
  .section {
    padding: 3rem 1.5rem;
  }
}

if (!window.MotionPreference) {
  const __mql = window.matchMedia("(prefers-reduced-motion: reduce)");
  const __listeners = new Set();

  const MotionPreference = {
    prefersReducedMotion() {
      return __mql.matches;
    },
    setOverride(value) {
      const reduced = Boolean(value);
      document.documentElement.classList.toggle("reduced-motion", reduced);
      window.dispatchEvent(new CustomEvent("motion-preference", { detail: { reduced } }));
      for (const listener of __listeners) {
        try {
          listener({ reduced, override: reduced, systemReduced: __mql.matches });
        } catch {}
      }
    },
    onChange(listener) {
      __listeners.add(listener);
      try {
        listener({
          reduced: __mql.matches,
          override: null,
          systemReduced: __mql.matches,
        });
      } catch {}
      return () => __listeners.delete(listener);
    },
    getState() {
      return { reduced: __mql.matches, override: null, systemReduced: __mql.matches };
    },
  };

  window.MotionPreference = MotionPreference;
}

function prefersReducedMotion() {
  return window.MotionPreference.prefersReducedMotion();
}

function initDemoShell() {
  // No-op shim in imported standalone snippets.
}

import gsap from "gsap";
import { ScrollTrigger } from "gsap/ScrollTrigger";
import { SplitText } from "gsap/SplitText";
import Lenis from "lenis";

gsap.registerPlugin(ScrollTrigger, SplitText);

// ── Demo shell ──
initDemoShell({
  title: "Text Reveal on Scroll",
  category: "scroll",
  tech: ["gsap", "splittext", "scrolltrigger"],
});

// ── Lenis ──
const lenis = new Lenis({ lerp: 0.1, smoothWheel: true });
lenis.on("scroll", ScrollTrigger.update);
gsap.ticker.add((time) => lenis.raf(time * 1000));
gsap.ticker.lagSmoothing(0);

const reduced = prefersReducedMotion();
if (reduced) document.documentElement.classList.add("reduced-motion");

window.addEventListener("motion-preference", (e) => {
  document.documentElement.classList.toggle("reduced-motion", e.detail.reduced);
  ScrollTrigger.refresh();
});

const dur = (d) => (reduced ? 0 : d);

// ── Hero entrance (no scroll trigger) ──
const heroLabel = document.querySelector(".hero-section .label");
const heroH1 = document.querySelector(".hero-section h1");
const heroSub = document.querySelector(".hero-section .split-sub");

gsap.set([heroLabel, heroSub], { opacity: 0, y: reduced ? 0 : 20 });

const heroSplit = new SplitText(heroH1, { type: "chars", charsClass: "char" });

gsap.set(heroSplit.chars, { opacity: 0, y: reduced ? 0 : 40, rotateX: reduced ? 0 : -60 });

const heroTl = gsap.timeline({ delay: 0.4 });
heroTl
  .to(heroLabel, { opacity: 1, y: 0, duration: dur(0.6), ease: "expo.out" })
  .to(
    heroSplit.chars,
    {
      opacity: 1,
      y: 0,
      rotateX: 0,
      duration: dur(0.6),
      ease: "back.out(1.4)",
      stagger: { each: 0.03, from: "start" },
    },
    "-=0.3"
  )
  .to(heroSub, { opacity: 1, y: 0, duration: dur(0.7), ease: "expo.out" }, "-=0.4");

// ── Character reveals ──
document.querySelectorAll(".split-chars:not(.hero-section h1)").forEach((el) => {
  const split = new SplitText(el, { type: "chars", charsClass: "char" });

  gsap.set(split.chars, {
    opacity: 0,
    y: reduced ? 0 : 50,
    rotateX: reduced ? 0 : -45,
  });

  gsap.to(split.chars, {
    opacity: 1,
    y: 0,
    rotateX: 0,
    duration: dur(0.5),
    ease: "back.out(1.2)",
    stagger: { each: 0.025, from: "start" },
    scrollTrigger: {
      trigger: el,
      start: "top 80%",
      toggleActions: "play none none reverse",
    },
  });
});

// ── Word reveals ──
document.querySelectorAll(".split-words").forEach((el) => {
  const split = new SplitText(el, { type: "words", wordsClass: "word" });

  gsap.set(split.words, {
    opacity: 0,
    y: reduced ? 0 : 35,
    scale: reduced ? 1 : 0.95,
  });

  gsap.to(split.words, {
    opacity: 1,
    y: 0,
    scale: 1,
    duration: dur(0.6),
    ease: "expo.out",
    stagger: { each: 0.06, from: "start" },
    scrollTrigger: {
      trigger: el,
      start: "top 80%",
      toggleActions: "play none none reverse",
    },
  });
});

// ── Line reveals ──
document.querySelectorAll(".split-lines").forEach((el) => {
  const split = new SplitText(el, { type: "lines", linesClass: "line" });

  gsap.set(split.lines, {
    opacity: 0,
    y: reduced ? 0 : 30,
  });

  gsap.to(split.lines, {
    opacity: 1,
    y: 0,
    duration: dur(0.7),
    ease: "power3.out",
    stagger: { each: 0.1, from: "start" },
    scrollTrigger: {
      trigger: el,
      start: "top 85%",
      toggleActions: "play none none reverse",
    },
  });
});

// ── Line heading reveals ──
document.querySelectorAll(".split-lines-heading").forEach((el) => {
  const split = new SplitText(el, { type: "lines", linesClass: "line" });

  gsap.set(split.lines, {
    opacity: 0,
    x: reduced ? 0 : -40,
  });

  gsap.to(split.lines, {
    opacity: 1,
    x: 0,
    duration: dur(0.8),
    ease: "expo.out",
    stagger: { each: 0.12, from: "start" },
    scrollTrigger: {
      trigger: el,
      start: "top 75%",
      toggleActions: "play none none reverse",
    },
  });
});

// ── Scrub-linked character reveal ──
document.querySelectorAll(".scrub-chars").forEach((el) => {
  const split = new SplitText(el, { type: "chars", charsClass: "char" });

  gsap.set(split.chars, {
    opacity: 0.15,
    color: "#263249",
  });

  gsap.to(split.chars, {
    opacity: 1,
    color: "#f0f4fb",
    duration: dur(0.3),
    stagger: { each: 0.03, from: "start" },
    scrollTrigger: {
      trigger: el,
      start: "top 70%",
      end: "top 30%",
      scrub: 1,
    },
  });
});

// ── Labels entrance ──
document.querySelectorAll(".section:not(.hero-section) .label").forEach((el) => {
  gsap.set(el, { opacity: 0, y: reduced ? 0 : 15 });

  gsap.to(el, {
    opacity: 1,
    y: 0,
    duration: dur(0.5),
    ease: "expo.out",
    scrollTrigger: {
      trigger: el.closest(".section"),
      start: "top 80%",
      toggleActions: "play none none reverse",
    },
  });
});

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Text Reveal on Scroll — stealthisdesign</title>
  <link rel="stylesheet" href="style.css">
    <script type="importmap">{"imports":{"gsap":"https://esm.sh/gsap@3.13.0","gsap/ScrollTrigger":"https://esm.sh/gsap@3.13.0/ScrollTrigger","gsap/SplitText":"https://esm.sh/gsap@3.13.0/SplitText","gsap/Flip":"https://esm.sh/gsap@3.13.0/Flip","gsap/ScrambleTextPlugin":"https://esm.sh/gsap@3.13.0/ScrambleTextPlugin","gsap/TextPlugin":"https://esm.sh/gsap@3.13.0/TextPlugin","gsap/all":"https://esm.sh/gsap@3.13.0/all","gsap/":"https://esm.sh/gsap@3.13.0/","lenis":"https://esm.sh/lenis@1.1.13/dist/lenis.mjs","three":"https://esm.sh/three@0.171.0","three/addons/":"https://esm.sh/three@0.171.0/examples/jsm/"}}</script>
  <style>html.lenis,
html.lenis body {
  height: auto;
}

.lenis:not(.lenis-autoToggle).lenis-stopped {
  overflow: clip;
}

.lenis [data-lenis-prevent],
.lenis [data-lenis-prevent-wheel],
.lenis [data-lenis-prevent-touch] {
  overscroll-behavior: contain;
}

.lenis.lenis-smooth iframe {
  pointer-events: none;
}

.lenis.lenis-autoToggle {
  transition-property: overflow;
  transition-duration: 1ms;
  transition-behavior: allow-discrete;
}</style>
</head>
<body>
  <!-- Hero -->
  <section class="section hero-section">
    <div class="content">
      <span class="label">Demo 03</span>
      <h1 class="split-headline">Typography in Motion</h1>
      <p class="split-sub">Scroll down to reveal text character by character, line by line.</p>
    </div>
  </section>

  <!-- Character reveal -->
  <section class="section">
    <div class="content">
      <span class="label">Character Reveal</span>
      <h2 class="split-chars">Every letter carries weight.</h2>
      <p class="split-lines">Characters cascade into view with rotational depth, creating a sense of dimensionality that flat fades can never achieve. The stagger timing is crucial — too fast feels frantic, too slow feels sluggish.</p>
    </div>
  </section>

  <!-- Word reveal -->
  <section class="section">
    <div class="content">
      <span class="label">Word Reveal</span>
      <h2 class="split-words">Words emerge from silence into meaning.</h2>
      <p class="split-lines">When words arrive as units, they carry more semantic weight. The reader processes clusters of meaning rather than individual glyphs, creating a rhythm that mirrors natural speech patterns.</p>
    </div>
  </section>

  <!-- Line reveal -->
  <section class="section">
    <div class="content">
      <span class="label">Line Reveal</span>
      <h2 class="split-lines-heading">Lines unfold like<br>pages turning in<br>a silent film.</h2>
    </div>
  </section>

  <!-- Mixed styles -->
  <section class="section">
    <div class="content">
      <span class="label">Scrub Reveal</span>
      <h2 class="scrub-chars">Scroll controls the narrative.</h2>
      <p class="split-lines">This section ties character reveal directly to scroll progress — scrub back and forth to see each letter respond to your scroll position. No play/reverse, just pure scroll-linked choreography.</p>
    </div>
  </section>

  <!-- Quote -->
  <section class="section section-quote">
    <div class="content">
      <blockquote class="split-chars quote-text">"Good animation is invisible. Great animation is unforgettable."</blockquote>
    </div>
  </section>

  <!-- Finale -->
  <section class="section">
    <div class="content">
      <h2 class="split-chars">Fin.</h2>
      <a href="/" class="back-link">Back to Gallery</a>
    </div>
  </section>

  <script type="module" src="script.js"></script>
</body>
</html>