Premium Velocity Experience

:root {
  --bg: #070a12;
  --text: #f0f4fb;
  --panel: #121a2b;
  --border: #263249;
  --accent: #86e8ff;
  --muted: #8a95a8;
  --purple: #ae52ff;
  --pink: #ff40d6;
  --hue-shift: 0deg;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Fixed layers */
#velocity-canvas,
#hero-canvas {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
}

#velocity-canvas {
  z-index: 2;
}
#hero-canvas {
  z-index: 1;
}

section {
  position: relative;
  z-index: 3;
}

/* ── Hero ── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 5rem 2rem;
  background: radial-gradient(ellipse at 50% 40%, rgba(134, 232, 255, 0.04) 0%, transparent 65%);
}

.hero-content {
  max-width: 680px;
  text-align: center;
}

.hero-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(134, 232, 255, 0.3);
  border-radius: 20px;
  padding: 0.3rem 1rem;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: 4rem;
  font-weight: 900;
  line-height: 1.05;
  margin-bottom: 1.5rem;
  letter-spacing: -2px;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--muted);
  margin-bottom: 2.5rem;
  line-height: 1.8;
}

/* Speed indicator */
.speed-indicator {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  max-width: 320px;
  margin: 0 auto;
  padding: 0.8rem 1.2rem;
  background: rgba(18, 26, 43, 0.8);
  border: 1px solid var(--border);
  border-radius: 30px;
  backdrop-filter: blur(8px);
}

.speed-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.speed-bar-track {
  flex: 1;
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}

.speed-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(to right, var(--accent), var(--purple));
  border-radius: 2px;
  transition: width 0.1s linear;
}

.speed-value {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  min-width: 28px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ── Gradient Text ── */
.gradient-text {
  background: linear-gradient(
    90deg,
    hsl(var(--hue-shift), 80%, 55%),
    hsl(calc(var(--hue-shift) + 70deg), 80%, 55%),
    hsl(calc(var(--hue-shift) + 140deg), 80%, 55%)
  );
  background-size: 200% 100%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradShift 6s linear infinite;
}

@keyframes gradShift {
  0% {
    background-position: 0% center;
  }
  100% {
    background-position: 200% center;
  }
}

@supports not (-webkit-background-clip: text) {
  .gradient-text {
    color: var(--accent);
    background: none;
  }
}

/* ── Depth Section ── */
.depth-section {
  padding: 8rem 2rem;
  border-top: 1px solid var(--border);
  background: rgba(7, 10, 18, 0.85);
  backdrop-filter: blur(4px);
}

.depth-cards {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  perspective: 1200px;
}

.depth-card {
  padding: 2rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.depth-card:hover {
  border-color: hsl(var(--card-hue), 80%, 55%);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.dc-icon {
  font-size: 2rem;
  color: hsl(var(--card-hue), 80%, 55%);
  margin-bottom: 1rem;
}

.depth-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.8rem;
}

.depth-card p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.7;
}

/* ── Stats ── */
.stats-section {
  padding: 7rem 2rem;
  border-top: 1px solid var(--border);
  background: rgba(7, 10, 18, 0.9);
}

.section-header {
  text-align: center;
  max-width: 560px;
  margin: 0 auto 4rem;
}

.section-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.section-header h2 {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.stats-grid {
  max-width: 800px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.stat-card {
  text-align: center;
  padding: 2rem 1rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  transition: all 0.3s ease;
}

.stat-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -1px;
  margin-bottom: 0.5rem;
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--muted);
  line-height: 1.5;
}

/* ── Features ── */
.features-section {
  padding: 7rem 2rem;
  border-top: 1px solid var(--border);
  background: rgba(7, 10, 18, 0.85);
}

.features-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.feature-item {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
}

.feature-item:last-child {
  border-bottom: none;
}

.feature-num {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--accent);
  opacity: 0.5;
  padding-top: 0.3rem;
  flex-shrink: 0;
  width: 28px;
}

.feature-text h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.6rem;
}

.feature-text p {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.8;
}

code {
  background: rgba(134, 232, 255, 0.1);
  color: var(--accent);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-family: "Monaco", monospace;
  font-size: 0.88em;
}

/* ── CTA ── */
.cta-section {
  padding: 8rem 2rem;
  text-align: center;
  border-top: 1px solid var(--border);
  background: radial-gradient(ellipse at 50% 50%, rgba(134, 232, 255, 0.06) 0%, transparent 70%);
}

.cta-section h2 {
  font-size: 3.5rem;
  font-weight: 900;
  margin-bottom: 1rem;
  letter-spacing: -1.5px;
}

.cta-section p {
  font-size: 1.1rem;
  color: var(--muted);
  margin-bottom: 2rem;
}

.btn-primary {
  display: inline-block;
  padding: 0.9rem 2rem;
  background: var(--accent);
  color: var(--bg);
  border-radius: 6px;
  font-weight: 700;
  text-decoration: none;
  transition: all 0.3s ease;
}

.btn-primary:hover {
  background: rgba(134, 232, 255, 0.85);
  transform: translateY(-2px);
}

/* ── Responsive ── */
@media (max-width: 900px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.8rem;
  }
  .depth-cards {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .section-header h2 {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2.2rem;
  }
  .cta-section h2 {
    font-size: 2.5rem;
  }
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
}

html.reduced-motion #velocity-canvas {
  display: none;
}
html.reduced-motion .gradient-text {
  animation: none !important;
}
html.reduced-motion * {
  animation-duration: 0.01ms !important;
  transition-duration: 0.01ms !important;
}

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";

import * as THREE from "three";

gsap.registerPlugin(ScrollTrigger);

initDemoShell({
  title: "Premium Velocity Experience",
  category: "pages",
  tech: ["three.js", "lenis", "gsap", "canvas-2d", "velocity"],
});

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

// ─── Lenis Setup ──────────────────────────────────────────────────────────────
const lenis = new Lenis({ lerp: 0.08, smoothWheel: true });
lenis.on("scroll", ScrollTrigger.update);
gsap.ticker.lagSmoothing(0);

// ─── Three.js Hero ───────────────────────────────────────────────────────────
const heroCanvas = document.getElementById("hero-canvas");
const renderer = new THREE.WebGLRenderer({ canvas: heroCanvas, alpha: true, antialias: true });
renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
renderer.setSize(window.innerWidth, window.innerHeight);

const scene = new THREE.Scene();
const camera = new THREE.PerspectiveCamera(60, window.innerWidth / window.innerHeight, 0.1, 100);
camera.position.z = 5;

// Icosahedron wireframe
const geo = new THREE.IcosahedronGeometry(1.8, 2);
const mat = new THREE.MeshBasicMaterial({
  color: 0x86e8ff,
  wireframe: true,
  transparent: true,
  opacity: 0.18,
});
const mesh = new THREE.Mesh(geo, mat);
scene.add(mesh);

// Inner sphere
const innerGeo = new THREE.SphereGeometry(0.9, 16, 16);
const innerMat = new THREE.MeshBasicMaterial({
  color: 0xae52ff,
  wireframe: true,
  transparent: true,
  opacity: 0.1,
});
const innerMesh = new THREE.Mesh(innerGeo, innerMat);
scene.add(innerMesh);

// Ambient particles
const particleCount = 600;
const positions = new Float32Array(particleCount * 3);
for (let i = 0; i < particleCount; i++) {
  positions[i * 3] = (Math.random() - 0.5) * 20;
  positions[i * 3 + 1] = (Math.random() - 0.5) * 20;
  positions[i * 3 + 2] = (Math.random() - 0.5) * 10;
}
const partGeo = new THREE.BufferGeometry();
partGeo.setAttribute("position", new THREE.BufferAttribute(positions, 3));
const partMat = new THREE.PointsMaterial({
  color: 0x86e8ff,
  size: 0.03,
  transparent: true,
  opacity: 0.4,
});
const particles = new THREE.Points(partGeo, partMat);
scene.add(particles);

// Scroll-driven rotation
let scrollProgress = 0;
ScrollTrigger.create({
  trigger: document.body,
  start: "top top",
  end: "bottom bottom",
  onUpdate: (self) => {
    scrollProgress = self.progress;
  },
});

window.addEventListener("resize", () => {
  camera.aspect = window.innerWidth / window.innerHeight;
  camera.updateProjectionMatrix();
  renderer.setSize(window.innerWidth, window.innerHeight);
});

// ─── Velocity Canvas (Demo 39 technique) ─────────────────────────────────────
const velCanvas = document.getElementById("velocity-canvas");
const ctx = velCanvas.getContext("2d");
let velocity = 0;
let smoothVelocity = 0;

function resizeVelCanvas() {
  velCanvas.width = window.innerWidth;
  velCanvas.height = window.innerHeight;
}
resizeVelCanvas();
window.addEventListener("resize", resizeVelCanvas);

function drawSpeedLines(vel) {
  const cx = velCanvas.width / 2;
  const cy = velCanvas.height / 2;
  const absVel = Math.abs(vel);
  const count = Math.floor(Math.min(80, absVel * 5));
  const opacity = Math.min(0.65, absVel * 0.045);
  const maxLen = Math.min(velCanvas.width, velCanvas.height) * 0.45 * Math.min(1, absVel * 0.025);

  ctx.clearRect(0, 0, velCanvas.width, velCanvas.height);
  if (count < 1 || opacity < 0.02) return;

  for (let i = 0; i < count; i++) {
    const angle = (i / count) * Math.PI * 2;
    const minR = 60;
    const sx = cx + Math.cos(angle) * minR;
    const sy = cy + Math.sin(angle) * minR;
    const ex = cx + Math.cos(angle) * (minR + maxLen);
    const ey = cy + Math.sin(angle) * (minR + maxLen);

    const grad = ctx.createLinearGradient(sx, sy, ex, ey);
    grad.addColorStop(0, `rgba(134, 232, 255, ${opacity})`);
    grad.addColorStop(0.5, `rgba(174, 82, 255, ${opacity * 0.5})`);
    grad.addColorStop(1, "rgba(134, 232, 255, 0)");

    ctx.beginPath();
    ctx.moveTo(sx, sy);
    ctx.lineTo(ex, ey);
    ctx.strokeStyle = grad;
    ctx.lineWidth = Math.max(0.5, absVel * 0.12);
    ctx.stroke();
  }
}

// Speed indicator UI
const speedFill = document.getElementById("speed-fill");
const speedValue = document.getElementById("speed-value");

// ─── Lenis scroll event ───────────────────────────────────────────────────────
lenis.on("scroll", (e) => {
  velocity = e.velocity;

  // Update speed UI
  const absVel = Math.abs(velocity);
  const pct = Math.min(100, absVel * 6);
  if (speedFill) speedFill.style.width = pct + "%";
  if (speedValue) speedValue.textContent = absVel.toFixed(1);
});

// ─── Main Animation Loop ──────────────────────────────────────────────────────
gsap.ticker.add((time) => {
  lenis.raf(time * 1000);

  // Smooth velocity decay
  smoothVelocity += (velocity - smoothVelocity) * 0.1;
  velocity *= 0.92;

  if (!reduced) {
    // Draw speed lines
    drawSpeedLines(smoothVelocity);

    // Rotate Three.js meshes
    const t = time * 0.3;
    mesh.rotation.x = t * 0.4 + scrollProgress * Math.PI * 2;
    mesh.rotation.y = t * 0.6;
    innerMesh.rotation.x = -t * 0.5;
    innerMesh.rotation.y = t * 0.8 + scrollProgress * Math.PI;
    particles.rotation.y = t * 0.08;

    // Velocity effect on mesh scale
    const absVel = Math.abs(smoothVelocity);
    const scalePulse = 1 + absVel * 0.008;
    mesh.scale.setScalar(scalePulse);
  }

  renderer.render(scene, camera);
});

// ─── Gradient hue shift on scroll ────────────────────────────────────────────
if (!reduced) {
  ScrollTrigger.create({
    trigger: document.body,
    start: "top top",
    end: "bottom bottom",
    onUpdate: (self) => {
      document.documentElement.style.setProperty("--hue-shift", `${self.progress * 300}deg`);
    },
  });
}

// ─── Hero entrance ────────────────────────────────────────────────────────────
if (!reduced) {
  gsap.set([".hero-tag", ".hero h1", ".hero-desc", ".speed-indicator"], { opacity: 0, y: 30 });
  gsap
    .timeline({ defaults: { ease: "expo.out" } })
    .to(".hero-tag", { opacity: 1, y: 0, duration: 0.7, delay: 0.5 })
    .to(".hero h1", { opacity: 1, y: 0, duration: 1 }, "-=0.4")
    .to(".hero-desc", { opacity: 1, y: 0, duration: 0.7 }, "-=0.5")
    .to(".speed-indicator", { opacity: 1, y: 0, duration: 0.6 }, "-=0.4");
}

// ─── Depth cards entrance (Demo 38 technique) ─────────────────────────────────
document.querySelectorAll(".depth-card").forEach((card, i) => {
  const depth = parseFloat(card.style.getPropertyValue("--depth")) || 0.5;

  if (!reduced) {
    gsap.set(card, { opacity: 0, y: 60, rotationX: 15, scale: 0.85 });
    gsap.to(card, {
      opacity: 1,
      y: 0,
      rotationX: 0,
      scale: 1,
      duration: 1,
      ease: "expo.out",
      delay: depth * 0.3,
      scrollTrigger: {
        trigger: ".depth-section",
        start: "top 70%",
        toggleActions: "play none none reverse",
      },
    });

    card.addEventListener("mouseenter", () =>
      gsap.to(card, { y: -12, duration: 0.4, overwrite: "auto" })
    );
    card.addEventListener("mouseleave", () =>
      gsap.to(card, { y: 0, duration: 0.4, overwrite: "auto" })
    );
  }
});

// ─── Stats counters ───────────────────────────────────────────────────────────
document.querySelectorAll(".stat-card").forEach((card, i) => {
  const valEl = card.querySelector(".stat-value");
  const target = parseFloat(card.dataset.target);
  const suffix = card.dataset.suffix || "";

  if (!reduced) {
    gsap.set(card, { opacity: 0, y: 30 });
    gsap.to(card, {
      opacity: 1,
      y: 0,
      duration: 0.7,
      ease: "expo.out",
      delay: i * 0.08,
      scrollTrigger: {
        trigger: ".stats-grid",
        start: "top 75%",
        toggleActions: "play none none reverse",
      },
    });

    ScrollTrigger.create({
      trigger: card,
      start: "top 80%",
      end: "top 25%",
      onUpdate: (self) => {
        const val = target * self.progress;
        const display = target % 1 !== 0 ? val.toFixed(1) : Math.round(val);
        valEl.textContent = display + suffix;
      },
    });
  } else {
    valEl.textContent = target + suffix;
  }
});

// ─── Features list ────────────────────────────────────────────────────────────
document.querySelectorAll(".feature-item").forEach((item, i) => {
  if (!reduced) {
    gsap.set(item, { opacity: 0, x: -30 });
    gsap.to(item, {
      opacity: 1,
      x: 0,
      duration: 0.8,
      ease: "expo.out",
      delay: i * 0.1,
      scrollTrigger: { trigger: item, start: "top 75%", toggleActions: "play none none reverse" },
    });
  }
});

// Section headers
document.querySelectorAll(".section-header").forEach((h) => {
  if (!reduced) {
    gsap.set(h.children, { opacity: 0, y: 25 });
    gsap.to(h.children, {
      opacity: 1,
      y: 0,
      duration: 0.7,
      stagger: 0.1,
      ease: "expo.out",
      scrollTrigger: { trigger: h, start: "top 75%", toggleActions: "play none none reverse" },
    });
  }
});

// CTA
if (!reduced) {
  gsap.set(".cta-section h2, .cta-section p, .cta-section a", { opacity: 0, y: 25 });
  gsap.to(".cta-section h2, .cta-section p, .cta-section a", {
    opacity: 1,
    y: 0,
    duration: 0.8,
    stagger: 0.12,
    ease: "expo.out",
    scrollTrigger: {
      trigger: ".cta-section",
      start: "top 75%",
      toggleActions: "play none none reverse",
    },
  });
}

// ─── Motion preference ────────────────────────────────────────────────────────
window.addEventListener("motion-preference", (e) => {
  if (e.detail.reduced) {
    gsap.globalTimeline.paused(true);
    ctx.clearRect(0, 0, velCanvas.width, velCanvas.height);
  } else {
    gsap.globalTimeline.paused(false);
  }
});

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Premium Velocity Experience — stealthisdesign</title>
  <link rel="stylesheet" href="style.css">
    <script type="importmap">{"imports":{"gsap":"https://esm.sh/[email protected]","gsap/ScrollTrigger":"https://esm.sh/[email protected]/ScrollTrigger","gsap/SplitText":"https://esm.sh/[email protected]/SplitText","gsap/Flip":"https://esm.sh/[email protected]/Flip","gsap/ScrambleTextPlugin":"https://esm.sh/[email protected]/ScrambleTextPlugin","gsap/TextPlugin":"https://esm.sh/[email protected]/TextPlugin","gsap/all":"https://esm.sh/[email protected]/all","gsap/":"https://esm.sh/[email protected]/","lenis":"https://esm.sh/[email protected]/dist/lenis.mjs","three":"https://esm.sh/[email protected]","three/addons/":"https://esm.sh/[email protected]/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>

  <!-- Velocity Canvas (fixed overlay) -->
  <canvas id="velocity-canvas" aria-hidden="true"></canvas>

  <!-- Three.js WebGL hero -->
  <canvas id="hero-canvas" aria-hidden="true"></canvas>

  <!-- Hero -->
  <section class="hero">
    <div class="hero-content">
      <div class="hero-tag">High Performance</div>
      <h1 class="gradient-text">Built for speed.<br>Designed to inspire.</h1>
      <p class="hero-desc">Scroll fast or scroll slow — this experience reacts to your velocity. Built with Three.js, Lenis, GSAP, and Canvas 2D in perfect sync.</p>
      <div class="speed-indicator" aria-live="polite">
        <span class="speed-label">Scroll Velocity</span>
        <div class="speed-bar-track">
          <div class="speed-bar-fill" id="speed-fill"></div>
        </div>
        <span class="speed-value" id="speed-value">0.0</span>
      </div>
    </div>
  </section>

  <!-- Depth Section -->
  <section class="depth-section">
    <div class="depth-cards">
      <div class="depth-card" style="--depth: 0.9; --card-hue: 195">
        <div class="dc-icon">◆</div>
        <h3>Velocity Tracking</h3>
        <p>Lenis exposes scroll velocity on every frame. The faster you scroll, the more dramatic the visual response.</p>
      </div>
      <div class="depth-card" style="--depth: 0.5; --card-hue: 270">
        <div class="dc-icon">▲</div>
        <h3>Canvas Speed Lines</h3>
        <p>Radial speed lines drawn on Canvas 2D scale with velocity magnitude — count, length, and opacity all react.</p>
      </div>
      <div class="depth-card" style="--depth: 0.7; --card-hue: 330">
        <div class="dc-icon">●</div>
        <h3>Three.js Hero</h3>
        <p>A WebGL scene runs in the hero background, rotating and reacting to scroll progress through GSAP.</p>
      </div>
    </div>
  </section>

  <!-- Velocity Stats -->
  <section class="stats-section">
    <div class="section-header">
      <span class="section-tag">Performance</span>
      <h2 class="gradient-text">Numbers in motion</h2>
    </div>
    <div class="stats-grid">
      <div class="stat-card" data-target="60" data-suffix=" fps">
        <div class="stat-value">0 fps</div>
        <div class="stat-label">Target Frame Rate</div>
      </div>
      <div class="stat-card" data-target="16.6" data-suffix=" ms">
        <div class="stat-value">0 ms</div>
        <div class="stat-label">Frame Budget</div>
      </div>
      <div class="stat-card" data-target="3" data-suffix="">
        <div class="stat-value">0</div>
        <div class="stat-label">Rendering Layers</div>
      </div>
      <div class="stat-card" data-target="0" data-suffix=" ms">
        <div class="stat-value">0 ms</div>
        <div class="stat-label">Input Lag</div>
      </div>
    </div>
  </section>

  <!-- Features -->
  <section class="features-section">
    <div class="section-header">
      <span class="section-tag">Techniques</span>
      <h2>What makes it tick</h2>
    </div>
    <div class="features-list">
      <div class="feature-item">
        <div class="feature-num">01</div>
        <div class="feature-text">
          <h3>Lenis Velocity API</h3>
          <p>Access real-time scroll velocity through Lenis's <code>scroll</code> event. Map the absolute value to visual intensity for reactive effects.</p>
        </div>
      </div>
      <div class="feature-item">
        <div class="feature-num">02</div>
        <div class="feature-text">
          <h3>Canvas 2D Compositing</h3>
          <p>A fixed Canvas layer sits above the page with <code>pointer-events: none</code>. Speed lines are cleared and redrawn each rAF tick.</p>
        </div>
      </div>
      <div class="feature-item">
        <div class="feature-num">03</div>
        <div class="feature-text">
          <h3>Three.js + ScrollTrigger</h3>
          <p>The WebGL hero canvas uses GSAP's ticker. Camera and mesh rotation are driven by scroll progress for seamless integration.</p>
        </div>
      </div>
      <div class="feature-item">
        <div class="feature-num">04</div>
        <div class="feature-text">
          <h3>CSS Hue Shift</h3>
          <p>Gradient text hue is updated each frame from a ScrollTrigger <code>onUpdate</code> callback — no repaints, just CSS variable changes.</p>
        </div>
      </div>
    </div>
  </section>

  <!-- CTA -->
  <section class="cta-section">
    <h2 class="gradient-text">Scroll to believe it.</h2>
    <p>Three rendering layers. Zero jank. One experience.</p>
    <a href="/" class="btn-primary">Back to Gallery</a>
  </section>

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