:root {
  --navy: #0b1f3a;
  --amber: #f5b301;
  --bg: #f4f6f9;
  --surface: #ffffff;
  --text: #1b2430;
  --muted: #5f6b7a;
  --border: #dde3ea;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0a1424;
    --surface: #11203a;
    --text: #e8eef6;
    --muted: #9fb0c6;
    --border: #22365a;
  }
}
:root[data-theme="dark"] {
  --bg: #0a1424;
  --surface: #11203a;
  --text: #e8eef6;
  --muted: #9fb0c6;
  --border: #22365a;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}
a { color: inherit; }
.wrap { max-width: 780px; margin: 0 auto; padding: 0 16px; }
header { background: var(--navy); color: #fff; }
.bar { display: flex; align-items: center; justify-content: space-between; padding-top: 16px; padding-bottom: 16px; gap: 12px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; text-decoration: none; }
.bar nav { display: flex; gap: 16px; font-size: .95rem; }
.bar nav a { color: #c9d6e8; text-decoration: none; }
.bar nav a[aria-current="page"] { color: var(--amber); }

main { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 28px 24px 36px; margin: 32px auto; }
h1 { font-size: clamp(1.7rem, 4vw, 2.2rem); line-height: 1.15; margin: 0 0 6px; }
.updated { color: var(--muted); margin: 0 0 24px; }
h2 { font-size: 1.2rem; margin: 30px 0 8px; }
p, li { max-width: 68ch; }
ul { padding-left: 22px; }
li { margin: 4px 0; }
footer { padding: 8px 0 48px; color: var(--muted); font-size: .9rem; text-align: center; }
footer a { margin: 0 8px; }

@media (max-width: 520px) {
  .bar { flex-wrap: wrap; }
  main { padding: 22px 16px 28px; margin: 20px auto; }
}