✓ 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 at top maps to "air" correctly in label but the CSS rotation + value mapping makes slider-bottom=water work, yet the visual slider thumb travel direction is wrong for native feel); mass and density values are static labels rather than live-updating DOM elements, and the ASCII animation is creative but the water-rise visual difference between the two tanks is subtle and hard to perceive.
9,147 output tokens · claude-opus-4-6 · end_turn
Slider direction is inverted (min=0 at top maps to "air" correctly in label but the CSS rotation + value mapping makes slider-bottom=water work, yet the visual slider thumb travel direction is wrong for native feel); mass and density values are static labels rather than live-updating DOM elements, and the ASCII animation is creative but the water-rise visual difference between the two tanks is subtle and hard to perceive.