:root {
  --bg: #ffffff;
  --fg: #16181d;
  --muted: #5b6270;
  --line: #e4e6eb;
  --accent: #1f5fbf;
  --card: #f6f7f9;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --fg: #eceef2;
    --muted: #9aa1ad;
    --line: #262a31;
    --accent: #7fb0ff;
    --card: #181b20;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header { border-bottom: 1px solid var(--line); }
header .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { font-weight: 700; letter-spacing: .01em; color: var(--fg); text-decoration: none; }
nav a { color: var(--muted); text-decoration: none; margin-left: 20px; font-size: 15px; }
nav a:hover, nav a[aria-current="page"] { color: var(--fg); }
main { padding: 48px 0 64px; }
h1 { font-size: 32px; line-height: 1.2; margin: 0 0 16px; }
h2 { font-size: 20px; margin: 40px 0 12px; }
p.lead { font-size: 18px; color: var(--muted); margin: 0 0 8px; }
a { color: var(--accent); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 20px; margin: 12px 0; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); }
dl { display: grid; grid-template-columns: 200px 1fr; gap: 10px 20px; margin: 0; }
dt { color: var(--muted); }
dd { margin: 0; overflow-wrap: anywhere; }
@media (max-width: 560px) {
  dl { grid-template-columns: 1fr; gap: 2px; }
  dd { margin-bottom: 12px; }
  h1 { font-size: 26px; }
}
footer { border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer .wrap { padding: 24px 16px; }