*{margin:0;padding:0;box-sizing:border-box;cursor:crosshair}body{background:#000;color:#0f0;font-family:"Press Start 2P",cursive;overflow:hidden;display:flex;justify-content:center;align-items:center;height:100vh}#game-canvas{display:block;image-rendering:pixelated;border:4px solid #333;box-shadow:0 0 20px #00ff004d}#ui{position:absolute;top:20px;left:20px;z-index:10;pointer-events:none;text-transform:uppercase;letter-spacing:2px}.hud-score,.hud-health{font-size:1.2rem;text-shadow:0 0 5px #0f0}.screen-overlay{position:absolute;top:0;left:0;width:100vw;height:100vh;display:flex;justify-content:center;align-items:center;background:#000000d9;z-index:100;color:#0f0;flex-direction:column;display:none}h1{margin-bottom:20px;font-size:2rem;text-shadow:0 0 10px #0f0}input{background:#000;border:2px solid #0f0;color:#0f0;padding:10px;font-size:1.5rem;width:200px;text-align:center;margin:20px;text-transform:uppercase}button{background:#0f0;color:#000;border:none;padding:15px 30px;font-size:1rem;cursor:pointer;font-weight:700}button:hover{background:#fff}#highscores{list-style:none;margin-top:20px;font-size:.8rem;text-align:center}#highscores li{margin:10px 0;border-bottom:1px solid #333;padding:5px}