Make a 3D first-person zombie survival shooter in one web page: you hold out in a rain-soaked night city plaza with burning cars, flickering neon signs and fog. WASD to move, mouse to aim, click to fire, right-click to aim down sights, R to reload, Shift to sprint. Zombies come in waves, each wave bigger, and stagger when hit. Give the gun recoil, muzzle flash, shell casings and a reload animation. Add a HUD with health, ammo, wave number, a crosshair, hit markers and a kill counter, plus wave-clear and game over screens. Make it look as cinematic as you can. It should feel fun the moment it loads.