*{margin:0;padding:0;box-sizing:border-box}body,html{overflow:hidden;width:100%;height:100%;font-family:Arial,sans-serif;background-color:#87ceeb}#game-container{position:absolute;width:100%;height:100%;top:0;left:0;z-index:1}canvas{display:block;width:100%;height:100%}#ui-overlay{position:absolute;bottom:20px;right:20px;z-index:100}#speedometer{background-color:#00000080;color:#fff;padding:10px 15px;border-radius:5px;font-size:18px;margin-bottom:10px}#fps-counter{background-color:#00000080;color:#fff;padding:5px 10px;border-radius:3px;font-size:14px;position:absolute;top:10px;right:10px;z-index:100;font-family:monospace;text-shadow:-1px -1px 0 #000,1px -1px 0 #000,-1px 1px 0 #000,1px 1px 0 #000}#performance-control{position:absolute;bottom:10px;right:10px;background-color:#00000080;color:#fff;padding:10px;border-radius:5px;z-index:100;display:flex;flex-wrap:wrap;justify-content:center;gap:5px}#performance-control button{padding:5px 10px;border:none;border-radius:3px;background-color:#444;color:#fff;cursor:pointer;font-size:14px;transition:all .2s ease;min-width:80px}#performance-control button:hover{background-color:#666}#performance-control button.active{background-color:#007bff;box-shadow:0 0 5px #007bffb3}#performance-control button:nth-child(1){border-bottom:2px solid #00ff00}#performance-control button:nth-child(2){border-bottom:2px solid #ffff00}#performance-control button:nth-child(3){border-bottom:2px solid #ff0000}#performance-control button:last-child{background-color:#333;border-bottom:2px solid #00ffff;margin-top:5px;width:100%}