✓ 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 — the label layout says "Luft" (air) at top and "Wasser" (water) at bottom, but the vertical-lr + direction:rtl CSS transform causes the thumb to start at the bottom (water) when value=0 and rise to air at value=100, contradicting the intended and labeled mapping; every other feature is solidly implemented with good physics, rich visuals, and a full Heureka payoff.
10,580 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted — the label layout says "Luft" (air) at top and "Wasser" (water) at bottom, but the vertical-lr + direction:rtl CSS transform causes the thumb to start at the bottom (water) when value=0 and rise to air at value=100, contradicting the intended and labeled mapping; every other feature is solidly implemented with good physics, rich visuals, and a full Heureka payoff.