Arc Motion Path

<!--
  Arc Motion Path - 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-arc-motion-path">
  <svg viewBox="0 0 760 430" aria-hidden="true">
    <path
      id="arc-motion-path-path-a"
      class="path"
      d="M104 310 C178 110, 334 74, 442 178 S592 306, 668 120"
    />
    <path id="arc-motion-path-path-b" class="path" d="M118 142 C224 300, 410 330, 642 206" />
  </svg>
  <div class="core">Arc Motion Path</div>
  <div class="chip chip-a"><span class="dot"></span>Plan</div>
  <div class="chip chip-b"><span class="dot"></span>Render</div>
</div>

<style>
  .hf-advanced-arc-motion-path {
    color: var(--fg, #111827);
    font-family: var(--font-body, Inter, system-ui, sans-serif);
  }
  .hf-advanced-arc-motion-path {
    position: relative;
    width: 760px;
    height: 430px;
    border-radius: var(--radius, 30px);
    overflow: hidden;
    background: radial-gradient(
      circle at 50% 20%,
      var(--bg, #f4f4f5),
      var(--bg, #f8fafc) 54%,
      var(--bg, #e4e4e7)
    );
    box-shadow: 0 28px 80px rgba(15, 23, 42, 0.18);
  }
  .hf-advanced-arc-motion-path svg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    overflow: visible;
  }
  .hf-advanced-arc-motion-path .path {
    fill: none;
    stroke: color-mix(in srgb, var(--fg, #111827) 18%, transparent);
    stroke-width: 3;
    stroke-dasharray: 10 12;
  }
  .hf-advanced-arc-motion-path .core {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 176px;
    height: 176px;
    margin: -88px 0 0 -88px;
    border-radius: 42px;
    background: var(--fg, #111827);
    color: var(--bg, #fff);
    display: grid;
    place-items: center;
    text-align: center;
    font-weight: 900;
    letter-spacing: -0.04em;
    box-shadow: 0 22px 54px rgba(15, 23, 42, 0.25);
  }
  .hf-advanced-arc-motion-path .chip {
    position: absolute;
    left: 0;
    top: 0;
    display: inline-flex;
    align-items: center;
    gap: var(--space-1, 8px);
    height: 42px;
    padding: 0 var(--space-2, 16px);
    border-radius: var(--radius, 999px);
    background: var(--surface, #fff);
    box-shadow: 0 16px 42px rgba(15, 23, 42, 0.14);
    font-weight: 800;
    transform-origin: 50% 50%;
  }
  .hf-advanced-arc-motion-path .dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius, 999px);
    background: var(--accent, #18181b);
  }
</style>

<!--
  Timeline integration:
  const startTime = 0;
  if (window.MotionPathPlugin) gsap.registerPlugin(MotionPathPlugin); tl.to('.hf-advanced-arc-motion-path .chip-a', { motionPath: { path: '#arc-motion-path-path-a', align: '#arc-motion-path-path-a', alignOrigin: [0.5, 0.5], autoRotate: true }, duration: 2.4, ease: 'power1.inOut' }, startTime); tl.to('.hf-advanced-arc-motion-path .chip-b', { motionPath: { path: '#arc-motion-path-path-b', align: '#arc-motion-path-path-b', alignOrigin: [0.5, 0.5], autoRotate: true, start: 0.1, end: 0.92 }, duration: 2.1, ease: 'sine.inOut' }, startTime + 0.25);
-->