:root {
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --accent: #1e293b;
  --link: #1d4ed8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --card: #111827;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --border: #1f2937;
    --accent: #e5e7eb;
    --link: #93c5fd;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
header { margin-bottom: 24px; }
header a.brand { color: var(--accent); font-weight: 700; font-size: 20px; text-decoration: none; }
nav { margin-top: 8px; display: flex; gap: 16px; font-size: 15px; }
h1 { font-size: 28px; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 19px; margin: 32px 0 8px; }
p, li { color: var(--text); }
.muted { color: var(--muted); font-size: 14px; }
a { color: var(--link); }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px 20px; margin: 16px 0; }
.contact { font-size: 18px; font-weight: 600; }
details { border-bottom: 1px solid var(--border); padding: 12px 0; }
summary { cursor: pointer; font-weight: 600; }
details p { margin: 8px 0 0; }