✓ 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
Exceptionally complete implementation hitting every required feature — physics values are accurate (19.32 vs 11.0 g/cm³, same 1000 g mass), water rise is visually proportional, slider direction is correct (top=air, bottom=water), Heureka fades in at full submersion with sparkles, and splash/ripple animations are well-crafted; only weaknesses are that volume/density/mass values in the data panels are static (hardcoded, not live-updating per submersion depth) and the custom SVG slider lacks an HTML range input, making precise dragging slightly awkward.
12,198 output tokens · claude-opus-4-6 · end_turn
Exceptionally complete implementation hitting every required feature — physics values are accurate (19.32 vs 11.0 g/cm³, same 1000 g mass), water rise is visually proportional, slider direction is correct (top=air, bottom=water), Heureka fades in at full submersion with sparkles, and splash/ripple animations are well-crafted; only weaknesses are that volume/density/mass values in the data panels are static (hardcoded, not live-updating per submersion depth) and the custom SVG slider lacks an HTML range input, making precise dragging slightly awkward.