*{margin:0;padding:0;box-sizing:border-box}body{font-family:Arial,sans-serif;background-color:#2c3e50;display:flex;justify-content:center;align-items:center;min-height:100vh;color:#fff}#game-container{position:relative;border:3px solid #34495e;border-radius:10px;background-color:#34495e;padding:20px}#gameCanvas{border:2px solid #ecf0f1;background-color:#27ae60;display:block;cursor:crosshair}#game-ui{position:absolute;top:10px;left:10px;z-index:10}#score,#health{background-color:#000000b3;padding:8px 12px;margin-bottom:5px;border-radius:5px;font-weight:700;font-size:14px}#instructions{position:absolute;bottom:10px;left:10px;background-color:#000000b3;padding:8px 12px;border-radius:5px;font-size:12px;max-width:300px}#game-over{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background-color:#000000e6;padding:30px;border-radius:10px;text-align:center;z-index:100}#game-over h2{color:#e74c3c;margin-bottom:15px;font-size:24px}#game-over p{margin-bottom:20px;font-size:16px}#restartBtn{background-color:#3498db;color:#fff;border:none;padding:10px 20px;border-radius:5px;font-size:16px;cursor:pointer;transition:background-color .3s}#restartBtn:hover{background-color:#2980b9}.hidden{display:none}