:root{
  --bg:#0f172a;--card:#111827;--text:#e5e7eb;--muted:#94a3b8;--brand:#38bdf8;
  --accent:#22c55e;--warn:#f59e0b;--danger:#ef4444;--link:#60a5fa;--border:#1f2937;
}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.6}
a{color:var(--link);text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px}
header,main,footer{max-width:1100px;margin:auto;padding:2rem}
header{padding-top:3rem}
h1{font-size:2.5rem;margin-bottom:1rem}
h2{font-size:1.6rem;margin-top:2rem;margin-bottom:.75rem}
footer{color:var(--muted);border-top:1px solid var(--border)}