✓ Two crowns ✓ Same mass, different density ✓ Vertical slider ✓ Slider works ✓ Slider controls crowns ✓ Slider direction correct ✓ Full slider range ✓ Fall animation ✓ Water displacement ✓ Rising water level ✓ Splash effects ✓ Physics correct ✓ Live mass value ✓ Live volume value ✓ Live density value ✓ Live displaced water ✓ Gilded displaces more ✓ Heureka animation ✓ No external deps ✓ Light bg / dark text ✓ Self-contained HTML
All 21 features implemented; the custom SVG drag-slider works correctly top-to-bottom, physics values are plausible (gold 19.32 g/cm³, gilded 11 g/cm³, same 1000 g mass), displaced-water updates live, splash/bubble/ripple/heureka animations all fire, but water rise is purely proportional to t (not keyed to actual submersion fraction) so it starts rising before the crown touches the surface.
11,176 output tokens · claude-opus-4-6 · end_turn
All 21 features implemented; the custom SVG drag-slider works correctly top-to-bottom, physics values are plausible (gold 19.32 g/cm³, gilded 11 g/cm³, same 1000 g mass), displaced-water updates live, splash/bubble/ripple/heureka animations all fire, but water rise is purely proportional to t (not keyed to actual submersion fraction) so it starts rising before the crown touches the surface.