Single-File Three.js Cyberpunk Hovercar Racing Game

Create a complete, playable 3D racing game in a single HTML file using Three.js. Game: Futuristic hovercar racing on a neon cyberpunk track. 3 laps. 3 AI opponents. Boost pads. Speedometer. Lap counter. Position tracker. Controls: W/Up to accelerate, S/Down to brake, A/D or Left/Right to steer. Visuals: Neon cyberpunk aesthetic. Glowing track edges. Particle effects for speed and boost. Dark skybox with city lights. AI: 3 opponents with different colors that follow the track and react to the player. Game States: Start screen -> Active race -> Race complete (shows position and lap times). Tech: Single HTML file. Three.js from CDN. No external assets. 60fps. Keyboard only. Responsive viewport. Build a functional, polished racing game that works immediately when opened.