*{box-sizing:border-box;padding:0;margin:0}body,html{max-width:100vw;overflow-x:hidden;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{background:#000;display:flex;justify-content:center;align-items:center;min-height:100vh;touch-action:manipulation;-webkit-tap-highlight-color:transparent;-webkit-touch-callout:none;-webkit-user-select:none;-moz-user-select:none;user-select:none}#game-container{position:relative;border:2px solid #333;border-radius:8px;overflow:hidden;box-shadow:0 4px 20px rgba(0,0,0,.5)}#game-canvas{display:block;background:#70c5ce;image-rendering:-webkit-optimize-contrast;image-rendering:crisp-edges;image-rendering:pixelated;transform:translateZ(0);-webkit-backface-visibility:hidden;backface-visibility:hidden}.game-ui{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:10}.score{top:20px;transform:translateX(-50%);font-size:24px;font-weight:700;text-shadow:2px 2px 4px rgba(0,0,0,.5);z-index:20}.game-over,.score{position:absolute;left:50%;color:#fff}.game-over{top:50%;transform:translate(-50%,-50%);background:rgba(0,0,0,.8);padding:30px;border-radius:10px;text-align:center;z-index:30;pointer-events:auto}.game-over h2{margin-bottom:20px;font-size:28px}.game-over p{margin-bottom:15px;font-size:18px}.restart-btn{background:#4caf50;color:#fff;border:none;padding:12px 24px;font-size:16px;border-radius:5px;cursor:pointer;transition:background .3s}.restart-btn:hover{background:#45a049}.start-screen{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:rgba(0,0,0,.8);color:#fff;padding:30px;border-radius:10px;text-align:center;z-index:30;pointer-events:auto}.start-screen h1{margin-bottom:20px;font-size:32px;color:gold}.start-screen p{margin-bottom:15px;font-size:18px}.start-btn{background:#ff6b6b;color:#fff;border:none;padding:12px 24px;font-size:16px;border-radius:5px;cursor:pointer;transition:background .3s}.start-btn:hover{background:#ff5252}.instructions{position:absolute;bottom:20px;left:50%;transform:translateX(-50%);color:#fff;text-align:center;font-size:14px;text-shadow:1px 1px 2px rgba(0,0,0,.5);z-index:20}@media (max-width:768px){.score{font-size:20px}.game-over h2{font-size:24px}.start-screen h1{font-size:28px}.instructions{font-size:12px}}