✓ 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 per the hint label ("⬆ Luft / ⬇ Wasser") but the writing-mode/rtl CSS actually makes the physical top of the slider correspond to value=100 (water), not air — confirmed by the slider starting at value=0 (air) which renders at the bottom of the vertical track, contradicting the label; physics values (gold 19.3 g/cm³, gilded 8.5 g/cm³, same 1000 g mass) are accurate and displacement ratio is correctly shown, with polished SVG visuals, working splash, wave animation, and Heureka overlay.
Slider direction is inverted per the hint label ("⬆ Luft / ⬇ Wasser") but the writing-mode/rtl CSS actually makes the physical top of the slider correspond to value=100 (water), not air — confirmed by the slider starting at value=0 (air) which renders at the bottom of the vertical track, contradicting the label; physics values (gold 19.3 g/cm³, gilded 8.5 g/cm³, same 1000 g mass) are accurate and displacement ratio is correctly shown, with polished SVG visuals, working splash, wave animation, and Heureka overlay.