html,body,#root{margin:0;padding:0;width:100vw;height:100vh;display:flex;justify-content:center;align-items:center;background-color:#000}#app{display:flex;justify-content:center;align-items:center;width:90vw;height:90vh;max-width:700px;max-height:900px;background-color:#2d2d2d;border:2px solid #444;box-shadow:0 0 20px #00000080;position:relative}canvas{width:100%;height:100%}.game-ui{position:absolute;top:20px;left:20px;color:#fff;font-family:Arial,sans-serif}.game-over-container{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);text-align:center;color:#fff;z-index:10}.game-over{font-size:2.5em;font-weight:700;color:red;margin-bottom:20px}button{font-size:1.2rem;padding:10px 20px;background-color:#2d2d2d;color:#fff;border:none;border-radius:5px;cursor:pointer;transition:background-color .3s ease}button:hover{background-color:#666}