✓ 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/top=air is correct intent, but CSS uses writing-mode:vertical-lr + direction:rtl which flips so dragging up increases value, meaning top=water and bottom=air in practice); all other physics, animation, and panel features are solidly implemented.
Slider direction is inverted (min=0/top=air is correct intent, but CSS uses writing-mode:vertical-lr + direction:rtl which flips so dragging up increases value, meaning top=water and bottom=air in practice); all other physics, animation, and panel features are solidly implemented.