:root { color-scheme: dark; }
* { box-sizing: border-box; }
html, body { width: 100%; height: 100%; margin: 0; overflow: hidden; background: #17131f; }
body { touch-action: none; overscroll-behavior: none; user-select: none; -webkit-user-select: none; }
canvas { display: block; width: 100%; height: 100%; cursor: crosshair; touch-action: none; }