Text Reveal on Scroll

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":"/vendor/gsap/index.js","gsap/ScrollTrigger":"/vendor/gsap/ScrollTrigger.js","gsap/SplitText":"/vendor/gsap/SplitText.js","gsap/Flip":"/vendor/gsap/Flip.js","gsap/ScrambleTextPlugin":"/vendor/gsap/ScrambleTextPlugin.js","gsap/TextPlugin":"/vendor/gsap/TextPlugin.js","gsap/all":"/vendor/gsap/all.js","gsap/":"/vendor/gsap/","lenis":"/vendor/lenis/dist/lenis.mjs","three":"/vendor/three/build/three.module.js","three/addons/":"/vendor/three/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>