:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --ink: #0e1a33;
  --muted: #4c5975;
  --brand: #0e2f6e;
  --accent: #f8efd9;
  --border: #dde3ef;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a1122;
    --card: #131c33;
    --ink: #eef1f8;
    --muted: #aab4cc;
    --brand: #7b9be0;
    --accent: #2c2412;
    --border: #233150;
  }
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 32px 20px 64px; }
header.site { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.logo {
  width: 44px; height: 44px; border-radius: 12px; background: var(--accent);
  display: flex; align-items: center; justify-content: center; font-size: 22px;
  overflow: hidden;
}
header.site .name { font-weight: 700; font-size: 18px; color: var(--brand); }
nav { margin: 16px 0 32px; display: flex; gap: 18px; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover, nav a.active { color: var(--brand); }
h1 { font-size: 30px; color: var(--brand); margin-bottom: 4px; }
.updated { color: var(--muted); font-size: 14px; margin-bottom: 20px; }
.intro { font-size: 17px; margin-bottom: 24px; }
.callout {
  background: var(--accent); border-radius: 12px; padding: 16px 18px;
  margin-bottom: 28px; font-size: 15px;
}
section { margin-bottom: 26px; }
h2 { font-size: 20px; color: var(--brand); margin-bottom: 8px; }
p { margin-bottom: 10px; }
ul { padding-left: 22px; margin: 8px 0 10px; }
li { margin-bottom: 8px; }
li strong { color: var(--brand); }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 20px 22px; margin-bottom: 18px;
}
.card h2 { margin-bottom: 6px; }
a.button {
  display: inline-block; background: var(--brand); color: #fff;
  padding: 10px 20px; border-radius: 10px; text-decoration: none;
  font-weight: 600; margin-top: 6px;
}
footer { margin-top: 48px; color: var(--muted); font-size: 13px; }
footer a { color: var(--muted); }