Card Automatic Transition

:root {
  color-scheme: only light;
  --bg: #07070c;
  --bg-2: #101225;
  --fg: #f5f4f2;
  --muted: rgba(245, 244, 242, 0.7);
  --accent: #73d0ff;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Rubik", "Segoe UI", sans-serif;
  background: radial-gradient(900px 520px at 10% -10%, rgba(115, 208, 255, 0.25), transparent 60%),
    radial-gradient(900px 620px at 90% 0%, rgba(245, 123, 180, 0.2), transparent 60%),
    linear-gradient(150deg, #05050b 0%, #0f1224 55%, #1a1e36 100%);
  color: var(--fg);
}

.page {
  min-height: 100vh;
}

.hero {
  padding: 72px clamp(24px, 5vw, 96px) 40px;
  max-width: 760px;
}

.kicker {
  text-transform: uppercase;
  letter-spacing: 0.38em;
  font-size: 0.8rem;
  color: var(--accent);
  margin: 0 0 16px;
}

.hero h1 {
  font-family: "Cardo", "Times New Roman", serif;
  font-size: clamp(2.6rem, 5vw, 4.4rem);
  margin: 0 0 18px;
}

.lead {
  margin: 0;
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--muted);
}

.scroll-stage {
  position: relative;
  height: calc((var(--card-count, 4) + 1) * 100vh);
}

.card-stack {
  position: sticky;
  top: 0;
  height: 100vh;
  display: grid;
  place-items: center;
  padding: clamp(24px, 4vw, 52px);
}

.card {
  position: absolute;
  width: min(960px, 92vw);
  min-height: 430px;
  border-radius: 32px;
  overflow: hidden;
  background: rgba(16, 18, 30, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 30px 90px rgba(5, 6, 12, 0.55);
  display: grid;
  grid-template-columns: minmax(240px, 320px) 1fr;
  gap: clamp(16px, 3vw, 36px);
  padding: clamp(24px, 4vw, 44px);
  opacity: 0;
  transform: translateX(80px) scale(0.96);
  filter: blur(10px);
  clip-path: polygon(0 0, 0 100%, 0 100%, 0 0);
  transition: opacity 0.12s ease, transform 0.12s ease, filter 0.12s ease;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(115, 208, 255, 0.22), transparent 55%);
  pointer-events: none;
}

.media {
  position: relative;
  border-radius: 22px;
  min-height: 240px;
  background-size: cover;
  background-position: center;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.12);
  transform: translateX(0px) scale(1);
  transition: transform 0.2s var(--ease);
}

.media-sky {
  background-image: radial-gradient(circle at 15% 20%, rgba(120, 230, 255, 0.9), transparent 55%),
    radial-gradient(circle at 80% 30%, rgba(120, 255, 198, 0.6), transparent 55%),
    linear-gradient(135deg, #1b2a4a, #263e74);
}

.media-tide {
  background-image: radial-gradient(circle at 20% 20%, rgba(255, 192, 118, 0.9), transparent 55%),
    radial-gradient(circle at 75% 40%, rgba(255, 108, 150, 0.7), transparent 60%),
    linear-gradient(135deg, #2a1c2a, #4a2b3b);
}

.media-dune {
  background-image: radial-gradient(circle at 30% 25%, rgba(255, 210, 130, 0.95), transparent 60%),
    radial-gradient(circle at 70% 65%, rgba(255, 160, 90, 0.6), transparent 60%),
    linear-gradient(140deg, #3b2616, #6a3b1e);
}

.media-orbit {
  background-image: radial-gradient(circle at 20% 25%, rgba(160, 185, 255, 0.9), transparent 55%),
    radial-gradient(circle at 80% 70%, rgba(140, 120, 255, 0.6), transparent 60%),
    linear-gradient(135deg, #121428, #2a2f5e);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(10, 12, 20, 0.15), rgba(10, 12, 20, 0.55));
  opacity: 0.7;
}

.content {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 16px;
}

.title {
  font-family: "Cardo", "Times New Roman", serif;
  font-size: clamp(1.8rem, 3vw, 2.7rem);
  margin: 0;
}

.copy {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--muted);
}

.btn {
  align-self: flex-start;
  cursor: pointer;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  border: 1px solid rgba(115, 208, 255, 0.7);
  background: rgba(115, 208, 255, 0.12);
  color: var(--fg);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: 0.7rem;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
  background: rgba(115, 208, 255, 0.28);
}

.meta {
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(245, 244, 242, 0.7);
}

.footer {
  padding: 64px clamp(24px, 5vw, 96px) 96px;
  color: var(--muted);
}

@media (max-width: 900px) {
  .card {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .card,
  .media,
  .btn {
    transition: none;
  }
}

const cardsData = [
  {
    title: "Mountain View",
    copy: "Check out these high-altitude escapes with crisp air and cinematic horizons.",
    button: "View Trips",
    theme: "media-sky",
  },
  {
    title: "To The Beach",
    copy: "Plan your next shoreline getaway with warm sunsets and deep blue water.",
    button: "View Trips",
    theme: "media-tide",
  },
  {
    title: "Desert Destinations",
    copy: "Wind-shaped dunes and amber tones for your most surreal journey yet.",
    button: "Book Now",
    theme: "media-dune",
  },
  {
    title: "Explore The Galaxy",
    copy: "Lift off into a night-sky adventure with glowing stardust and nebula haze.",
    button: "Book Now",
    theme: "media-orbit",
  },
];

const stack = document.getElementById("card-stack");
const stage = document.getElementById("scroll-stage");

stack.innerHTML = cardsData
  .map((card, index) => {
    return `
      <article class="card" data-index="${index}" aria-hidden="true">
        <div class="media ${card.theme}"></div>
        <div class="content">
          <p class="meta">0${index + 1}</p>
          <h2 class="title">${card.title}</h2>
          <p class="copy">${card.copy}</p>
          <button class="btn" type="button">${card.button}</button>
        </div>
      </article>
    `;
  })
  .join("");

stage.style.setProperty("--card-count", cardsData.length);

const cards = Array.from(document.querySelectorAll(".card"));

const clamp = (value, min, max) => Math.min(Math.max(value, min), max);

const prefersReducedMotion = window.matchMedia("(prefers-reduced-motion: reduce)");
const cycleMs = prefersReducedMotion.matches ? 2800 : 3800;
const transitionMs = prefersReducedMotion.matches ? 500 : 700;

function applyProgress(scaled) {
  cards.forEach((card, index) => {
    const distance = scaled - index;
    const absDistance = Math.abs(distance);
    const clamped = clamp(absDistance, 0, 1);
    const opacity = 1 - clamped;
    const slideX = distance * 110;
    const scale = 1 - clamped * 0.06;
    const blur = clamped * 12;
    const wipe = clamp(1 - clamped, 0, 1);

    card.style.opacity = opacity.toFixed(3);
    card.style.transform = `translateX(${slideX.toFixed(2)}px) scale(${scale.toFixed(3)})`;
    card.style.filter = `blur(${blur.toFixed(2)}px)`;
    card.style.clipPath = `polygon(0 0, ${wipe * 100}% 0, ${wipe * 100}% 100%, 0 100%)`;
    card.style.zIndex = String(cards.length - Math.round(absDistance * 10));
    card.setAttribute("aria-hidden", opacity < 0.6 ? "true" : "false");

    const media = card.querySelector(".media");
    if (media) {
      const mediaShift = clamp(-distance * 24, -30, 30);
      media.style.transform = `translateX(${mediaShift.toFixed(2)}px) scale(${(1 + clamped * 0.04).toFixed(3)})`;
    }
  });
}

let rafId = 0;
let startTime = 0;

function animate(now) {
  if (!startTime) startTime = now;

  const elapsed = now - startTime;
  const segment = cycleMs + transitionMs;
  const total = segment * cards.length;
  const loopTime = elapsed % total;

  const activeIndex = Math.floor(loopTime / segment);
  const segmentTime = loopTime % segment;
  const t = clamp(segmentTime / transitionMs, 0, 1);

  const eased = t < 0.5 ? 4 * t * t * t : 1 - Math.pow(-2 * t + 2, 3) / 2;

  const scaled = activeIndex + eased;
  applyProgress(scaled);

  rafId = window.requestAnimationFrame(animate);
}

applyProgress(0);
rafId = window.requestAnimationFrame(animate);

prefersReducedMotion.addEventListener("change", () => {
  window.cancelAnimationFrame(rafId);
  startTime = 0;
  rafId = window.requestAnimationFrame(animate);
});

<!doctype html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>Card Automatic Transition</title>
    <link rel="preconnect" href="https://fonts.googleapis.com" />
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
    <link href="https://fonts.googleapis.com/css2?family=Cardo:ital@0;1&family=Rubik:wght@400;600;700&display=swap"
        rel="stylesheet" />
    <link rel="stylesheet" href="style.css" />
</head>

<body>
    <main class="page">
        <header class="hero">
            <p class="kicker">Atlas Collection</p>
            <h1>Scroll To Morph The Cards</h1>
            <p class="lead">Each scroll segment slides, blurs, and reveals the next scene with a diagonal wipe.</p>
        </header>

        <section class="scroll-stage" id="scroll-stage">
            <div class="card-stack" id="card-stack"></div>
        </section>

        <footer class="footer">
            <p>Keep scrolling to replay the transition sequence.</p>
        </footer>
    </main>

    <script src="https://cdn.jsdelivr.net/npm/@studio-freight/lenis@1.0.42/bundled/lenis.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/gsap@3.12.5/dist/gsap.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/three@0.160.0/build/three.min.js"></script>
    <script src="script.js"></script>
</body>

</html>