✓ 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
Solid ASCII-art Archimedes demo with correct physics (gold 19.3 g/cm³, gilded 8.5 g/cm³, same 1000 g mass), live stats, rising water, splash, and Heureka overlay — but the vertical slider direction is inverted (slider value 0=top=air is correct conceptually yet the CSS uses vertical-lr/direction:rtl which renders top-of-track as max, so dragging up submerges the crowns), and there is no distinct fall/drop animation — crowns teleport rather than fall.
Solid ASCII-art Archimedes demo with correct physics (gold 19.3 g/cm³, gilded 8.5 g/cm³, same 1000 g mass), live stats, rising water, splash, and Heureka overlay — but the vertical slider direction is inverted (slider value 0=top=air is correct conceptually yet the CSS uses vertical-lr/direction:rtl which renders top-of-track as max, so dragging up submerges the crowns), and there is no distinct fall/drop animation — crowns teleport rather than fall.