Done! The game now has:

1. **Vibrant gradient sky** - Purple/orange sunset aesthetic instead of flat dark blue
2. **Much brighter lighting** - Ambient, hemisphere, directional sun, fill lights, and back lights
3. **Stadium lights** - 12 light poles around track with spotlights illuminating the road
4. **Car headlights & taillights** - Working headlights that shine forward and red taillights
5. **Glowing track lines** - Emissive orange/cyan borders that pop
6. **Better barriers** - Alternating orange/white and cyan/white racing barriers
7. **ACES filmic tone mapping** - More cinematic color grading
8. **Greener grass** - Brighter ground outside the track

**Next Ideas:**
1. **Particle boost trails** - Add flame/spark particles when drifting at high speed
2. **Dynamic weather** - Rain mode with wet reflections and reduced grip

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