Camera Rig Depth Stack

<!--
  Camera Rig Depth Stack - advanced HyperFrames primitive.

  This is intentionally seekable: drive it from a paused GSAP timeline.
  MotionPath examples require GSAP MotionPathPlugin. Three.js examples expose
  a render(progress) adapter instead of a free-running requestAnimationFrame loop.
-->

<div class="hf-advanced-camera-rig-depth-stack">
  <div class="panel">
    <div>
      <h3>Camera Rig Depth Stack</h3>
      <p>A 3D camera-rig-style card stack with depth, parallax, and focus shift.</p>
    </div>
  </div>
</div>

<style>
  .hf-advanced-camera-rig-depth-stack {
    color: #111827;
    font-family: Inter, system-ui, sans-serif;
  }
  .hf-advanced-camera-rig-depth-stack {
    position: relative;
    width: 760px;
    height: 430px;
    perspective: 900px;
    border-radius: 30px;
    overflow: hidden;
    background: linear-gradient(135deg, #0f172a, #312e81);
    box-shadow: 0 28px 80px rgba(15, 23, 42, 0.2);
  }
  .hf-advanced-camera-rig-depth-stack .panel {
    position: absolute;
    inset: 56px 90px;
    border-radius: 30px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.52));
    border: 1px solid rgba(255, 255, 255, 0.45);
    backdrop-filter: blur(18px);
    transform: rotateY(var(--hf-rotate-y, -16deg)) rotateX(var(--hf-rotate-x, 9deg))
      translateZ(var(--hf-z, 0px));
    box-shadow: 0 28px 90px rgba(0, 0, 0, 0.22);
    display: grid;
    place-items: center;
    text-align: center;
  }
  .hf-advanced-camera-rig-depth-stack h3 {
    margin: 0;
    color: #111827;
    font-size: 42px;
    letter-spacing: -0.05em;
  }
  .hf-advanced-camera-rig-depth-stack p {
    margin: 8px 0 0;
    color: #475569;
  }
</style>

<!--
  Timeline integration:
  const startTime = 0;
  tl.fromTo('.hf-advanced-camera-rig-depth-stack .panel', { '--hf-rotate-y': '-20deg', '--hf-rotate-x': '12deg', '--hf-z': '-80px', opacity: 0 }, { '--hf-rotate-y': '10deg', '--hf-rotate-x': '-4deg', '--hf-z': '80px', opacity: 1, duration: 1.2, ease: 'power3.out' }, startTime);
-->