html, body { height: 100%; }
body { margin: 0; background: #0f1720; color: #e6edf3; font-family: system-ui, Arial, sans-serif; }
#ui-root { position: absolute; inset: 0; display: grid; place-items: center; pointer-events: none; }
#menu { pointer-events: auto; text-align: center; }
#menu h1 { margin-bottom: 12px; }
#start-btn { padding: 10px 16px; font-size: 16px; cursor: pointer; }
canvas { display: block; margin: 0 auto; background: linear-gradient(#87CEEB, #bfe6ff); }