✓ 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 core features implemented with correct physics (ρ_gold=19.3, ρ_gilded=12.0, same 1000g mass), but the slider is SVG-drag-only (no native range input) which makes fine control awkward, and the water-rise pixel scale (0.2 px/cm³) makes the displacement difference subtle rather than dramatically obvious.
14,850 output tokens · claude-opus-4-6 · end_turn
All core features implemented with correct physics (ρ_gold=19.3, ρ_gilded=12.0, same 1000g mass), but the slider is SVG-drag-only (no native range input) which makes fine control awkward, and the water-rise pixel scale (0.2 px/cm³) makes the displacement difference subtle rather than dramatically obvious.