✓ 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
Impressively complete implementation with correct physics (Au 19.3 g/cm³, Au/Ag 13.0 g/cm³, same 1000 g mass, volumes 51.8 vs 76.9 cm³), live displaced-water readout, splash particles, wave animation, and Heureka reveal — main weaknesses are that mass/volume/density values are static (not dynamically recalculated per submersion depth) and the custom SVG slider lacks the snappiness and accessibility of a native range input.
9,690 output tokens · claude-opus-4-6 · end_turn
Impressively complete implementation with correct physics (Au 19.3 g/cm³, Au/Ag 13.0 g/cm³, same 1000 g mass, volumes 51.8 vs 76.9 cm³), live displaced-water readout, splash particles, wave animation, and Heureka reveal — main weaknesses are that mass/volume/density values are static (not dynamically recalculated per submersion depth) and the custom SVG slider lacks the snappiness and accessibility of a native range input.