Make a 3D endless runner game in one web page: a hoverboard rider races through a futuristic neon city, along rooftops, through tunnels and across bridges. Left and right arrow keys switch between three lanes, up arrow jumps, down arrow slides. Dodge trains, barriers and drones, grab coins and power-ups (magnet, shield, double score), and the speed keeps rising. Add speed lines, light trails, a camera that shakes on near misses, a score and coin HUD, and start and game over screens with the best score. Make it look as polished as a mobile hit. It should feel fast the moment it loads.