:root{
  --bg:#070a13; --bg2:#0d1220; --card:#111a2e; --line:rgba(255,255,255,.08);
  --txt:#e8ecf6; --mut:#8b94ad;
  --a:#6366f1; --b:#22d3ee; --c:#a855f7; --d:#f472b6;
  --rad:16px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:'Segoe UI',system-ui,-apple-system,Roboto,sans-serif;
  background:radial-gradient(1200px 600px at 80% -10%,rgba(99,102,241,.18),transparent),
             radial-gradient(900px 500px at 10% 20%,rgba(34,211,238,.10),transparent),var(--bg);
  color:var(--txt);line-height:1.6;
}
.hidden{display:none!important}
@media(max-width:720px){ .nav{display:none} }