✓ 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 (slider min=0 at left/top maps crowns to air, which is correct conceptually, but the rotated horizontal slider's thumb moves left=air and right=water, so dragging "down" visually increases value correctly — however mass/volume/density panels are static labels, not live-updating values, failing three live-value requirements.
7,997 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted (slider min=0 at left/top maps crowns to air, which is correct conceptually, but the rotated horizontal slider's thumb moves left=air and right=water, so dragging "down" visually increases value correctly — however mass/volume/density panels are static labels, not live-updating values, failing three live-value requirements.