cycle-atlas/.agents/skills/music-to-video/references/motion-primitives/tile-mosaic/scene.html

<template id="tile-mosaic-template">
  <div data-composition-id="tile-mosaic" data-width="1920" data-height="1080" data-duration="2.4">
    <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;
        align-items: center;
        justify-content: center;
      }
      .mosaic {
        position: relative;
        display: grid;
        grid-template-columns: repeat(6, 1fr);
        grid-template-rows: repeat(4, 1fr);
        gap: 6px;
        width: 1440px;
        height: 960px;
      }
      .tile {
        border-radius: 4px;
        will-change: transform, opacity;
      }
      .title {
        position: absolute;
        inset: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        font-weight: 900;
        font-size: 220px;
        letter-spacing: -0.03em;
        color: var(--hg-fg);
        text-shadow: 0 8px 40px rgba(0, 0, 0, 0.55);
        will-change: transform, opacity;
        pointer-events: none;
      }
    </style>
    <div class="stage">
      <div class="mosaic" id="mosaic"></div>
      <div class="title" id="title">MOSAIC</div>
    </div>
    <script>
      window.__timelines = window.__timelines || {};
      const tl = gsap.timeline({ paused: true });

      const COLS = 6;
      const ROWS = 4;
      const STEP = 0.06;
      // Deterministic palette; tile colour chosen by index, no randomness.
      const PALETTE = [
        "#7c3aed",
        "#a855f7",
        "#6d28d9",
        "#c084fc",
        "#5b21b6",
        "#8b5cf6",
        "#9333ea",
        "#4c1d95",
      ];

      const mosaic = document.getElementById("mosaic");
      const tiles = [];
      for (let i = 0; i < COLS * ROWS; i++) {
        const row = Math.floor(i / COLS);
        const col = i % COLS;
        const cell = document.createElement("div");
        cell.className = "tile";
        const a = PALETTE[(row + col) % PALETTE.length];
        const b = PALETTE[(row + col + 3) % PALETTE.length];
        cell.style.background = "linear-gradient(135deg, " + a + " 0%, " + b + " 100%)";
        mosaic.appendChild(cell);
        tiles.push({ el: cell, diag: row + col });
      }

      // Diagonal sweep: reveal order governed by (row + col), explicit per-tile timing.
      for (const t of tiles) {
        tl.fromTo(
          t.el,
          { autoAlpha: 0, scale: 0.6 },
          { autoAlpha: 1, scale: 1, duration: 0.4, ease: "back.out(1.7)" },
          t.diag * STEP,
        );
      }

      // Title settles over the finished, dense mosaic.
      tl.fromTo(
        "#title",
        { autoAlpha: 0, scale: 1.12 },
        { autoAlpha: 1, scale: 1, duration: 0.45, ease: "power2.out" },
        1.7,
      );

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