✓ 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
Comprehensive implementation hitting all major features with correct physics (ρ_gold=19.32, ρ_gilded=11.00, same 1000g mass), visible displacement difference, particle splash, ripple waves, Heureka animation, and live data panels — minor weakness is the custom SVG drag-thumb slider (no native range input) which can feel imprecise and lacks keyboard accessibility.
13,102 output tokens · claude-opus-4-6 · end_turn
Comprehensive implementation hitting all major features with correct physics (ρ_gold=19.32, ρ_gilded=11.00, same 1000g mass), visible displacement difference, particle splash, ripple waves, Heureka animation, and live data panels — minor weakness is the custom SVG drag-thumb slider (no native range input) which can feel imprecise and lacks keyboard accessibility.