*{margin:0;padding:0;box-sizing:border-box}body{font-family:Courier New,monospace;background:linear-gradient(to bottom,#0a0a1a,#1a1a3a);min-height:100vh;display:flex;justify-content:center;align-items:center;color:#fff}#game-container{position:relative;width:800px;max-width:95vw;aspect-ratio:4/3;background:#000;border:3px solid #00ff00;box-shadow:0 0 30px #00ff004d,inset 0 0 30px #00ff001a;border-radius:8px;overflow:hidden}canvas{width:100%;height:100%;display:block;image-rendering:pixelated}#overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:#000000d9;display:flex;justify-content:center;align-items:center;z-index:10}.screen{text-align:center;padding:40px;background:#001428e6;border:2px solid #00ff00;border-radius:12px;box-shadow:0 0 20px #00ff0080}.screen.hidden{display:none}.screen h1{font-size:3em;margin-bottom:20px;color:#0f0;text-shadow:0 0 10px #00ff00,0 0 20px #00ff00;letter-spacing:4px}.screen p{font-size:1.2em;margin-bottom:30px;color:#afa}button{font-family:Courier New,monospace;font-size:1.3em;font-weight:700;padding:15px 40px;background:#0f0;color:#000;border:none;border-radius:6px;cursor:pointer;transition:all .2s ease;text-transform:uppercase;letter-spacing:2px}button:hover{background:#0c0;transform:scale(1.05);box-shadow:0 0 20px #0f0c}button:active{transform:scale(.95)}#hud{position:absolute;top:10px;left:10px;right:10px;display:flex;justify-content:space-between;font-size:1.1em;font-weight:700;color:#0f0;text-shadow:0 0 5px #00ff00;pointer-events:none;z-index:5}#hud span{background:#001400b3;padding:5px 12px;border-radius:4px;border:1px solid #00ff00}#game-over-screen #final-score{font-size:1.5em;margin:20px 0;color:#f55}