✓ 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, visually polished implementation with correct physics (ρ_gold=19.32, ρ_gilded=13.15 g/cm³, same 1000g mass), live data panels, ripple/splash animations, and a Heureka reveal — minor flaw is that water rise is artificially amplified 3.5× rather than true scale, and the slider uses `writing-mode: vertical-lr` with `direction: rtl` which may behave inconsistently across browsers.
12,602 output tokens · claude-opus-4-6 · end_turn
Comprehensive, visually polished implementation with correct physics (ρ_gold=19.32, ρ_gilded=13.15 g/cm³, same 1000g mass), live data panels, ripple/splash animations, and a Heureka reveal — minor flaw is that water rise is artificially amplified 3.5× rather than true scale, and the slider uses `writing-mode: vertical-lr` with `direction: rtl` which may behave inconsistently across browsers.