✓ 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 with correct physics (gold 19.32 g/cm³, gilded 13.74 g/cm³, same 1000 g mass), iterative water-level calculation, canvas-drawn crowns, splash/ripple/bubble effects, comparison bar charts, and a polished Eureka overlay — but the slider is CSS-rotated (not a native vertical input) which can feel awkward, and crowns snap/translate linearly without a true free-fall animation arc.
11,959 output tokens · claude-opus-4-6 · end_turn
Comprehensive implementation with correct physics (gold 19.32 g/cm³, gilded 13.74 g/cm³, same 1000 g mass), iterative water-level calculation, canvas-drawn crowns, splash/ripple/bubble effects, comparison bar charts, and a polished Eureka overlay — but the slider is CSS-rotated (not a native vertical input) which can feel awkward, and crowns snap/translate linearly without a true free-fall animation arc.