✓ 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
Comprehensive implementation hitting all required features with correct physics (mass=1000g, ρ_gold=19.32, ρ_fake=11.00, buoyancy in Newtons), though water-rise calculation uses a simplified 2D pixel heuristic rather than true volumetric displacement, and the submerged-fraction transitions happen slightly abruptly due to crown size differences not fully iterating on the adjusted water surface.
12,291 output tokens · claude-opus-4-6 · end_turn
Comprehensive implementation hitting all required features with correct physics (mass=1000g, ρ_gold=19.32, ρ_fake=11.00, buoyancy in Newtons), though water-rise calculation uses a simplified 2D pixel heuristic rather than true volumetric displacement, and the submerged-fraction transitions happen slightly abruptly due to crown size differences not fully iterating on the adjusted water surface.