cycle-atlas/.agents/skills/music-to-video/references/motion-primitives/palette-flip/scene.html

<template id="palette-flip-template">
  <div data-composition-id="palette-flip" data-width="1920" data-height="1080" data-duration="2.6">
    <style>
      :root {
        --hg-violet: #7c3aed;
        --hg-violet-2: #a855f7;
        --hg-bg: #0a0a0f;
        --hg-fg: #f5f5fa;
        --hg-dim: #6b6b78;
      }
      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }
      .stage {
        position: absolute;
        inset: 0;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
      }
      .kicker {
        font-weight: 700;
        font-size: 38px;
        letter-spacing: 0.42em;
        text-transform: uppercase;
        margin-bottom: 40px;
      }
      .word {
        font-weight: 900;
        font-size: 300px;
        letter-spacing: -0.05em;
        line-height: 0.9;
        white-space: nowrap;
      }
      .bars {
        display: flex;
        gap: 26px;
        margin-top: 56px;
      }
      .bar {
        width: 220px;
        height: 26px;
        border-radius: 4px;
      }
      .bar.b2 {
        width: 140px;
      }
      .bar.b3 {
        width: 90px;
      }
    </style>
    <div class="stage">
      <div class="kicker" id="kicker">REGIME</div>
      <div class="word" id="word">REGIME</div>
      <div class="bars">
        <div class="bar b1"></div>
        <div class="bar b2"></div>
        <div class="bar b3"></div>
      </div>
    </div>
    <script>
      window.__timelines = window.__timelines || {};
      const tl = gsap.timeline({ paused: true });

      // Four distinct palette regimes — same layout, re-skinned on each flip.
      const regimes = [
        { bg: "#0a0a0f", fg: "#f5f5fa", accent: "#7c3aed", kicker: "#a855f7" }, // dark / violet
        { bg: "#f4ead8", fg: "#1a1410", accent: "#ff5a47", kicker: "#c4452f" }, // cream / coral
        { bg: "#08222b", fg: "#eafaf6", accent: "#1fd1b0", kicker: "#7fe3d2" }, // navy / teal
        { bg: "#000000", fg: "#ffce3a", accent: "#ffce3a", kicker: "#7a6010" }, // black / amber
      ];

      const beat = 0.6;
      const scene = "#scene";
      const word = "#word";
      const kicker = "#kicker";
      const bars = ".bar";

      // Instant 0ms flips on every beat — cycle through the regimes deterministically.
      // The motion IS the colour change; layout never moves.
      const flips = 5;
      for (let i = 0; i < flips; i++) {
        const p = regimes[i % regimes.length];
        const t = i * beat;
        tl.set(scene, { backgroundColor: p.bg }, t);
        tl.set(word, { color: p.fg }, t);
        tl.set(kicker, { color: p.kicker }, t);
        tl.set(bars, { backgroundColor: p.accent }, t);
      }

      window.__timelines["palette-flip"] = tl;
    </script>
  </div>
</template>