*{margin:0;padding:0;box-sizing:border-box}body{font-family:Arial,sans-serif;background:linear-gradient(to bottom,#87CEEB,#98FB98);display:flex;justify-content:center;align-items:center;min-height:100vh;overflow:hidden}.game-container{position:relative;border:3px solid #228B22;border-radius:10px;box-shadow:0 0 20px #0000004d}#gameCanvas{display:block;background:linear-gradient(to bottom,#87CEEB,#90EE90)}.ui{position:absolute;top:0;left:0;right:0;bottom:0;pointer-events:none}.score{position:absolute;top:20px;left:20px;font-size:24px;font-weight:700;color:#2f4f2f}.game-over{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:rgba(255,255,255,.9);padding:30px;border-radius:10px;text-align:center;box-shadow:0 0 20px #0000004d;pointer-events:auto}.game-over h2{color:tomato;margin-bottom:10px}.game-over button{background:#32CD32;color:#fff;border:none;padding:10px 20px;font-size:16px;border-radius:5px;cursor:pointer;margin-top:10px}.game-over button:hover{background:#228B22}.instructions{position:absolute;bottom:20px;left:50%;transform:translate(-50%);color:#2f4f2f;font-size:14px}