✓ 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 is inverted (min=0 at left/top maps to crowns in air, but the CSS rotation trick with `transform: rotate(-90deg)` means the thumb-at-top position sends value=0 which correctly keeps crowns in air — however the gradient goes gold→blue left-to-right which visually reads backwards — no discrete fall animation, crowns just linearly interpolate down without a timed drop sequence.
12,548 output tokens · claude-opus-4-6 · end_turn
Slider is inverted (min=0 at left/top maps to crowns in air, but the CSS rotation trick with `transform: rotate(-90deg)` means the thumb-at-top position sends value=0 which correctly keeps crowns in air — however the gradient goes gold→blue left-to-right which visually reads backwards — no discrete fall animation, crowns just linearly interpolate down without a timed drop sequence.