✓ 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
Strong overall implementation with correct physics (ρ_gold=19.3, ρ_gilded=13.0, same 1000g mass), working splash/heureka/bar-chart animations, but the slider is a custom SVG drag element (not a native range input), fall animation is absent (crowns teleport rather than animate), and the water-rise scale factor is an arbitrary pixel constant rather than derived from container geometry.
11,705 output tokens · claude-opus-4-6 · end_turn
Strong overall implementation with correct physics (ρ_gold=19.3, ρ_gilded=13.0, same 1000g mass), working splash/heureka/bar-chart animations, but the slider is a custom SVG drag element (not a native range input), fall animation is absent (crowns teleport rather than animate), and the water-rise scale factor is an arbitrary pixel constant rather than derived from container geometry.