WebGL Hero

The single "wow" beat: a calm domain-warped fbm "graphite dust" field in Stone tones behind sharp type, subtle cursor reaction, settles on load. Plain three.js (named imports, not R3F, see D016 - WebGL Uses Plain Three Not R3F) in a lazy island mounted after LCP so it never touches the critical path.

Budget: ~129KB gz (raw-WebGL ~3KB option open, D016), DPR ≤ 1.5, pause when off-screen/tab hidden, 60fps target / 30 floor. Degradation: reduced-motion / mobile / low-power → static poster image (WebGL + deviceMemory feature-detect).

Why exactly one: concentrating the heavy effect in one place keeps everything else instant, the contrast is the product signal. Rationale: D003 - Visual Restraint and One WebGL Moment. Style tokens: Design System.