Updated shadows with:
- **PCFSoftShadowMap** for smooth shadow edges
- **2048x2048 shadow map** resolution for sharp detail
- **Proper shadow camera bounds** covering the entire scene
- **Shadow bias & normal bias** to eliminate artifacts
- **ACES Filmic tone mapping** for better contrast
- All meshes properly configured with `castShadow`/`receiveShadow`
- Replaced Phong materials with PBR **StandardMaterial** throughout
- Added **fill light** for better ambient illumination

**Next Ideas:**
1. **Particle Effects** - Add falling cherry blossom petals with physics and wind animation
2. **Victory Animation** - Animate winning pieces with a glowing trail effect when someone wins

**Ready to level up your game? Pick one and let's build it!**