:root {
  --gap: 14px;
  --hud-h: 96px;          /* header height desktop */
  --hud-h-mobile: 82px;   /* header height mobile */
}

html, body { height:100%; margin:0; background:#111; color:#ddd; font:14px/1.4 system-ui, sans-serif; }
body { display:grid; grid-template-rows: auto 1fr auto; }