:root{
  --bg:#04070b; --panel:#070d14; --surface:#0a1017;
  --ink:#9fdcf4; --ink-dim:#3f6e86; --ink-faint:#1b3a4a;
  --cyan:#4fd6ff; --cyan-deep:#1f8fc4;
  --amber:#ffb24a; --orange:#ff7a30;
  --line:rgba(79,214,255,0.16); --line-soft:rgba(79,214,255,0.07);
  --glow-cyan:0 0 12px rgba(79,214,255,0.55);
  --glow-amber:0 0 14px rgba(255,140,50,0.5);
  --mono:'Share Tech Mono', ui-monospace, 'Courier New', monospace;
  --display:'Orbitron', sans-serif;

  /* act 4 geometry — read by js/layout.js as well as the stylesheets */
  --rail:clamp(230px, 21vw, 320px);
  --toph:clamp(84px, 11vh, 116px);
  --gap:clamp(10px, 1.1vw, 18px);
}