✓ 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 SVG implementation with correct physics (gold 19.3 g/cm³, alloy 13.0 g/cm³, same 1000g mass), live data panels, splash particles, Eureka animation, and rising water levels, but the custom SVG drag-slider lacks a native range input and has no UI affordance indicating it's draggable, and the water rise (PIXELS_PER_CM3=0.4) yields only ~12px vs ~31px difference — visually subtle rather than immediately obvious.
10,907 output tokens · claude-opus-4-6 · end_turn
Comprehensive SVG implementation with correct physics (gold 19.3 g/cm³, alloy 13.0 g/cm³, same 1000g mass), live data panels, splash particles, Eureka animation, and rising water levels, but the custom SVG drag-slider lacks a native range input and has no UI affordance indicating it's draggable, and the water rise (PIXELS_PER_CM3=0.4) yields only ~12px vs ~31px difference — visually subtle rather than immediately obvious.