:root {
  color-scheme: light dark;
  --bg: #0f1117;
  --fg: #eef2ff;
  --muted: #aab2c5;
  --card: #171a23;
  --accent: #8b5cf6;
  --border: #2a2f3d;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  background: radial-gradient(circle at top left, rgba(139,92,246,.22), transparent 38rem), var(--bg);
  color: var(--fg);
}
main {
  width: min(860px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 4rem 0;
}
article, .card {
  background: color-mix(in srgb, var(--card) 94%, transparent);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: clamp(1.25rem, 4vw, 2.5rem);
  box-shadow: 0 24px 80px rgba(0,0,0,.28);
}
h1 { line-height: 1.15; margin: 0 0 .5rem; font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { margin-top: 2rem; line-height: 1.25; }
p, li { color: var(--muted); }
a { color: #c4b5fd; }
nav { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 1.5rem; }
nav a { padding: .75rem 1rem; border: 1px solid var(--border); border-radius: 999px; text-decoration: none; }
.meta { color: var(--muted); margin-bottom: 2rem; }
.notice { border-left: 4px solid var(--accent); padding-left: 1rem; }
footer { margin-top: 2rem; color: var(--muted); font-size: .95rem; }
@media (prefers-color-scheme: light) {
  :root { --bg: #f8fafc; --fg: #111827; --muted: #4b5563; --card: #ffffff; --border: #e5e7eb; }
  body { background: radial-gradient(circle at top left, rgba(139,92,246,.16), transparent 38rem), var(--bg); }
}