* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0; width: 100%; height: 100%;
  overflow: hidden; background: #0b0e14;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  -webkit-user-select: none; user-select: none;
}
#gl { position: fixed; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }
#hud { position: fixed; inset: 0; z-index: 10; pointer-events: none; }
#menus { position: fixed; inset: 0; z-index: 20; }
#menus:empty { display: none; }