✓ 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
Near-complete implementation with correct physics (ρ_gold=19.32, ρ_gilded=11.0, same 1000g mass), rich SVG visuals, working splash/bubble/Heureka animations, and a custom SVG drag-slider that covers the full range — the only notable flaw is using a bespoke SVG drag handle instead of a native `<input type="range">`, which slightly reduces robustness and accessibility.
13,708 output tokens · claude-opus-4-6 · end_turn
Near-complete implementation with correct physics (ρ_gold=19.32, ρ_gilded=11.0, same 1000g mass), rich SVG visuals, working splash/bubble/Heureka animations, and a custom SVG drag-slider that covers the full range — the only notable flaw is using a bespoke SVG drag handle instead of a native `<input type="range">`, which slightly reduces robustness and accessibility.