✓ 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 required features implemented with physically correct values (Au 19.3 g/cm³, Au/Ag 13.0 g/cm³, same 1000 g mass); slider is SVG-draggable rather than a native range input, which is functional but adds UX friction, and the heureka pulse uses font-size mutation in the main loop rather than clean CSS/SVG animation.
9,990 output tokens · claude-opus-4-6 · end_turn
All required features implemented with physically correct values (Au 19.3 g/cm³, Au/Ag 13.0 g/cm³, same 1000 g mass); slider is SVG-draggable rather than a native range input, which is functional but adds UX friction, and the heureka pulse uses font-size mutation in the main loop rather than clean CSS/SVG animation.