body{margin:0;background-color:#fff;overflow:hidden}#app-container{display:flex;flex-direction:column;align-items:center;height:100vh;padding:20px;box-sizing:border-box}#canvas-wrapper{position:relative;flex:1;width:100%;max-width:100%;display:flex;justify-content:center;align-items:center;margin-bottom:10px}#game-canvas{display:block;max-width:100%;max-height:100%;background-color:#000}#control-panel{margin-top:10px;padding:12px 20px;border-radius:8px;background:#f0f4f8;box-shadow:0 2px 8px #0000001a;font-family:sans-serif;display:flex;flex-wrap:wrap;gap:12px;justify-content:center}.dropdown-label{display:flex;flex-direction:column;font-weight:700;font-size:14px}select{padding:5px 10px;border-radius:4px;border:1px solid #ccc;font-size:14px}.start-button{background-color:#007acc;color:#fff;border:none;padding:8px 16px;border-radius:6px;font-size:14px;cursor:pointer}.start-button:hover{background-color:#005fa3}#fullscreen-btn{position:absolute;top:10px;right:10px;background-color:#007acccc;color:#fff;border:none;padding:8px 12px;border-radius:6px;font-size:18px;cursor:pointer;z-index:100;transition:background-color .2s}#fullscreen-btn:hover{background-color:#005fa3e6}#canvas-wrapper:fullscreen,#canvas-wrapper:-webkit-full-screen{background-color:#000;padding:0}#canvas-wrapper:fullscreen #game-canvas,#canvas-wrapper:-webkit-full-screen #game-canvas{max-width:100vw;max-height:100vh}