*{margin:0;padding:0;box-sizing:border-box}body{display:grid;place-items:center;height:100vh;background:#1d1d1d;font-family:Arial}#gameContainer{position:relative}canvas{border:4px solid #222;max-width:100%;height:auto}#overlay{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;align-items:center;background:rgba(0,0,0,.3);color:#fff}button{padding:12px 24px;font-size:18px;cursor:pointer}
html,body,canvas{-webkit-touch-callout:none;-webkit-user-select:none;user-select:none;touch-action:manipulation;overscroll-behavior:none;}

html,body{overflow:hidden;touch-action:none;overscroll-behavior:none;}
#gameContainer,canvas{touch-action:none;}