*{box-sizing:border-box}
html,body{margin:0;width:100%;height:100%;overflow:hidden;background:#183f46;overscroll-behavior:none}
#game{width:min(100%,max(280px,56.25dvh));max-width:480px;height:100dvh;margin:auto;display:flex;flex-direction:column;background:#d9eee7}
#arena{position:relative;flex:1;min-height:0;overflow:hidden}
canvas{display:block;width:100%;height:100%;touch-action:none;user-select:none;-webkit-user-select:none;outline:none;-webkit-tap-highlight-color:transparent}