Smooth Scroll Story

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

:root {
  --bg: #070a12;
  --text: #f0f4fb;
  --muted: #8a95a8;
  --accent: #86e8ff;
  --neon-purple: #ae52ff;
  --neon-pink: #ff40d6;
  --warm: #ffcc66;
}

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

body {
  overflow-x: hidden;
}

/* ── Sections ── */
.section {
  position: relative;
  width: 100%;
  min-height: 100vh;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ── Layers for parallax ── */
.layer {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  will-change: transform;
}

.layer-fg {
  position: relative;
  z-index: 3;
}

.layer-mid {
  z-index: 2;
}
.layer-bg {
  z-index: 1;
}

/* ── Content ── */
.content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 2rem;
  max-width: 800px;
}

.eyebrow {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 1rem;
  opacity: 0;
}

.hero-title,
.reveal-text {
  font-size: clamp(2.5rem, 8vw, 6rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  opacity: 0;
}

.hero-title {
  background: linear-gradient(135deg, #fff 0%, var(--accent) 60%, var(--neon-purple) 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.reveal-text {
  color: var(--text);
}

.hero-sub,
.reveal-body {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--muted);
  max-width: 440px;
  margin-top: 1.2rem;
  line-height: 1.6;
  opacity: 0;
}

/* ── Scroll hint ── */
.scroll-hint {
  margin-top: 3rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0;
}

.scroll-arrow {
  width: 1px;
  height: 32px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: arrow-pulse 1.8s ease-in-out infinite;
}

@keyframes arrow-pulse {
  0%,
  100% {
    opacity: 0.3;
    transform: scaleY(0.6);
  }
  50% {
    opacity: 1;
    transform: scaleY(1);
  }
}

.reduced-motion .scroll-arrow {
  animation: none;
  opacity: 0.5;
}

/* ── Gradient orbs ── */
.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  will-change: transform;
}

.orb-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(134, 232, 255, 0.2), transparent 70%);
  top: 10%;
  right: 10%;
}

.orb-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(174, 82, 255, 0.15), transparent 70%);
  bottom: 20%;
  left: 5%;
}

.orb-3 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 64, 214, 0.12), transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.orb-4 {
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, rgba(174, 82, 255, 0.18), transparent 70%);
  top: 20%;
  left: 20%;
}

.orb-5 {
  width: 350px;
  height: 350px;
  background: radial-gradient(circle, rgba(255, 204, 102, 0.12), transparent 70%);
  bottom: 30%;
  right: 15%;
}

.orb-6 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(134, 232, 255, 0.15), transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

/* ── Floating rings ── */
.floating-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(134, 232, 255, 0.15);
  will-change: transform;
}

.ring-1 {
  width: 300px;
  height: 300px;
  top: 20%;
  left: 15%;
}

.ring-2 {
  width: 200px;
  height: 200px;
  bottom: 25%;
  right: 20%;
  border-color: rgba(174, 82, 255, 0.15);
}

/* ── Depth grid ── */
.depth-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(134, 232, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(134, 232, 255, 0.04) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ── Depth cards ── */
.depth-card {
  position: absolute;
  width: 180px;
  height: 100px;
  border-radius: 12px;
  background: rgba(18, 26, 43, 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(134, 232, 255, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  will-change: transform;
}

.card-inner {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.card-1 {
  top: 25%;
  left: 10%;
}
.card-2 {
  top: 40%;
  right: 8%;
}
.card-3 {
  bottom: 20%;
  left: 30%;
}

/* ── Back button ── */
.btn-back {
  display: inline-block;
  margin-top: 2.5rem;
  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;
  opacity: 0;
}

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

/* ── Reduced motion ── */
.reduced-motion .layer-bg,
.reduced-motion .layer-mid {
  transform: none !important;
}

.reduced-motion .eyebrow,
.reduced-motion .hero-title,
.reduced-motion .reveal-text,
.reduced-motion .hero-sub,
.reduced-motion .reveal-body,
.reduced-motion .scroll-hint,
.reduced-motion .depth-card,
.reduced-motion .btn-back {
  opacity: 1 !important;
  transform: none !important;
}

@media (max-width: 640px) {
  .depth-card {
    width: 140px;
    height: 80px;
  }
  .card-inner {
    font-size: 0.75rem;
  }
  .gradient-orb {
    transform: scale(0.6);
  }
}

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 Lenis from "lenis";

gsap.registerPlugin(ScrollTrigger);

// ── Demo shell ──
initDemoShell({
  title: "Smooth Scroll Story",
  category: "scroll",
  tech: ["gsap", "lenis", "scrolltrigger"],
});

// ── Lenis smooth scroll ──
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);

// ── Respect reduced motion ──
const reduced = prefersReducedMotion();

if (reduced) {
  document.documentElement.classList.add("reduced-motion");
}

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

// ── Parallax layers ──
document.querySelectorAll(".section").forEach((section) => {
  const bg = section.querySelector(".layer-bg");
  const mid = section.querySelector(".layer-mid");

  if (bg && !reduced) {
    gsap.to(bg, {
      yPercent: -15,
      ease: "none",
      scrollTrigger: {
        trigger: section,
        start: "top bottom",
        end: "bottom top",
        scrub: 1,
      },
    });
  }

  if (mid && !reduced) {
    gsap.to(mid, {
      yPercent: -30,
      ease: "none",
      scrollTrigger: {
        trigger: section,
        start: "top bottom",
        end: "bottom top",
        scrub: 1,
      },
    });
  }
});

// ── Hero section entrance ──
const heroTl = gsap.timeline({ defaults: { ease: "expo.out" } });

heroTl
  .to(".section-hero .eyebrow", {
    opacity: 1,
    y: 0,
    duration: reduced ? 0 : 0.8,
    delay: 0.3,
  })
  .to(
    ".hero-title",
    {
      opacity: 1,
      y: 0,
      duration: reduced ? 0 : 1,
    },
    "-=0.5"
  )
  .to(
    ".hero-sub",
    {
      opacity: 1,
      y: 0,
      duration: reduced ? 0 : 0.8,
    },
    "-=0.6"
  )
  .to(
    ".scroll-hint",
    {
      opacity: 1,
      duration: reduced ? 0 : 0.6,
    },
    "-=0.3"
  );

// Set initial positions
if (!reduced) {
  gsap.set(".section-hero .eyebrow", { y: 20 });
  gsap.set(".hero-title", { y: 40 });
  gsap.set(".hero-sub", { y: 30 });
}

// ── Scroll-triggered reveals ──
document.querySelectorAll(".section:not(.section-hero)").forEach((section) => {
  const eyebrow = section.querySelector(".eyebrow");
  const heading = section.querySelector(".reveal-text");
  const body = section.querySelector(".reveal-body");
  const btn = section.querySelector(".btn-back");

  const tl = gsap.timeline({
    scrollTrigger: {
      trigger: section,
      start: "top 70%",
      end: "top 20%",
      toggleActions: "play none none reverse",
    },
    defaults: { ease: "expo.out" },
  });

  if (eyebrow) {
    gsap.set(eyebrow, { y: reduced ? 0 : 20 });
    tl.to(eyebrow, { opacity: 1, y: 0, duration: reduced ? 0 : 0.7 });
  }

  if (heading) {
    gsap.set(heading, { y: reduced ? 0 : 50 });
    tl.to(heading, { opacity: 1, y: 0, duration: reduced ? 0 : 0.9 }, "-=0.4");
  }

  if (body) {
    gsap.set(body, { y: reduced ? 0 : 30 });
    tl.to(body, { opacity: 1, y: 0, duration: reduced ? 0 : 0.7 }, "-=0.5");
  }

  if (btn) {
    gsap.set(btn, { y: reduced ? 0 : 20 });
    tl.to(btn, { opacity: 1, y: 0, duration: reduced ? 0 : 0.6 }, "-=0.3");
  }
});

// ── Depth cards entrance ──
document.querySelectorAll(".depth-card").forEach((card, i) => {
  if (!reduced) {
    gsap.set(card, { y: 60, scale: 0.9 });
  }

  gsap.to(card, {
    opacity: 1,
    y: 0,
    scale: 1,
    duration: reduced ? 0 : 0.8,
    ease: "back.out(1.4)",
    scrollTrigger: {
      trigger: ".section-depth",
      start: "top 60%",
      toggleActions: "play none none reverse",
    },
    delay: i * 0.15,
  });
});

// ── Floating ring rotation (continuous, subtle) ──
if (!reduced) {
  gsap.to(".ring-1", {
    rotation: 360,
    duration: 30,
    ease: "none",
    repeat: -1,
  });

  gsap.to(".ring-2", {
    rotation: -360,
    duration: 25,
    ease: "none",
    repeat: -1,
  });
}

// ── Fade scroll hint on scroll ──
ScrollTrigger.create({
  trigger: ".section-hero",
  start: "top top",
  end: "20% top",
  onUpdate: (self) => {
    gsap.set(".scroll-hint", { opacity: 1 - self.progress * 3 });
  },
});

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Smooth Scroll Story — 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>
  <!-- Section 1: Hero -->
  <section class="section section-hero" data-bg="#070a12">
    <div class="layer layer-bg">
      <div class="gradient-orb orb-1"></div>
      <div class="gradient-orb orb-2"></div>
    </div>
    <div class="layer layer-mid">
      <div class="floating-ring ring-1"></div>
      <div class="floating-ring ring-2"></div>
    </div>
    <div class="layer layer-fg content">
      <span class="eyebrow">Demo 01</span>
      <h1 class="hero-title">Smooth<br>Scroll Story</h1>
      <p class="hero-sub">Parallax layers driven by Lenis + GSAP ScrollTrigger</p>
      <div class="scroll-hint">
        <span>Scroll to explore</span>
        <div class="scroll-arrow"></div>
      </div>
    </div>
  </section>

  <!-- Section 2: Reveal -->
  <section class="section section-reveal" data-bg="#0a0e1a">
    <div class="layer layer-bg">
      <div class="gradient-orb orb-3"></div>
    </div>
    <div class="layer layer-fg content">
      <span class="eyebrow">Chapter One</span>
      <h2 class="reveal-text">Motion tells<br>a story.</h2>
      <p class="reveal-body">Every scroll triggers a new layer of depth. Parallax creates the illusion of space, guiding the viewer through a cinematic narrative.</p>
    </div>
  </section>

  <!-- Section 3: Depth -->
  <section class="section section-depth" data-bg="#0e0818">
    <div class="layer layer-bg">
      <div class="depth-grid"></div>
    </div>
    <div class="layer layer-mid">
      <div class="depth-card card-1">
        <div class="card-inner">Performance</div>
      </div>
      <div class="depth-card card-2">
        <div class="card-inner">Elegance</div>
      </div>
      <div class="depth-card card-3">
        <div class="card-inner">Precision</div>
      </div>
    </div>
    <div class="layer layer-fg content">
      <span class="eyebrow">Chapter Two</span>
      <h2 class="reveal-text">Layers of<br>meaning.</h2>
    </div>
  </section>

  <!-- Section 4: Color -->
  <section class="section section-color" data-bg="#12061a">
    <div class="layer layer-bg">
      <div class="gradient-orb orb-4"></div>
      <div class="gradient-orb orb-5"></div>
    </div>
    <div class="layer layer-fg content">
      <span class="eyebrow">Chapter Three</span>
      <h2 class="reveal-text">Color shifts<br>with rhythm.</h2>
      <p class="reveal-body">Ambient gradients flow as you scroll, responding to the narrative pace. Each section carries its own atmosphere.</p>
    </div>
  </section>

  <!-- Section 5: Finale -->
  <section class="section section-finale" data-bg="#070a12">
    <div class="layer layer-bg">
      <div class="gradient-orb orb-6"></div>
    </div>
    <div class="layer layer-fg content">
      <span class="eyebrow">Finale</span>
      <h2 class="reveal-text">The scroll<br>is the story.</h2>
      <a href="/" class="btn-back">Back to Gallery</a>
    </div>
  </section>

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