✓ 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 major features are implemented with correct physics (gold 19.3 g/cm³, gilded 13.0 g/cm³, same 1000g mass), custom SVG drag-slider works correctly top=air/bottom=water, particle splashes and ripples fire on crown entry, Heureka fades in with pulse at full submersion, but mass/volume/density readouts are static (not truly "live" as they don't change with submersion fraction) and the water rise scale (PX_PER_CM3=0.39) is visually modest, making the differential hard to discern.
10,501 output tokens · claude-opus-4-6 · end_turn
All major features are implemented with correct physics (gold 19.3 g/cm³, gilded 13.0 g/cm³, same 1000g mass), custom SVG drag-slider works correctly top=air/bottom=water, particle splashes and ripples fire on crown entry, Heureka fades in with pulse at full submersion, but mass/volume/density readouts are static (not truly "live" as they don't change with submersion fraction) and the water rise scale (PX_PER_CM3=0.39) is visually modest, making the differential hard to discern.