✓ 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
Slider direction is inverted (min=0 at left/top maps to crowns above water, which is correct semantically, but the CSS `rotate(-90deg)` horizontal-to-vertical transform means dragging "up" visually increases the value — this creates an unintuitive feel); all physics (Archimedes, displaced volume, buoyancy force) are correctly implemented with plausible values, and the Heureka overlay, splash particles, rising water, and live data panel are all well-executed.
11,328 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted (min=0 at left/top maps to crowns above water, which is correct semantically, but the CSS `rotate(-90deg)` horizontal-to-vertical transform means dragging "up" visually increases the value — this creates an unintuitive feel); all physics (Archimedes, displaced volume, buoyancy force) are correctly implemented with plausible values, and the Heureka overlay, splash particles, rising water, and live data panel are all well-executed.