:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1c1c1e;
  --muted: #6e6e73;
  --border: #e5e5e7;
  --link: #0066cc;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1c1e;
    --fg: #f5f5f7;
    --muted: #9a9a9e;
    --border: #3a3a3c;
    --link: #4da3ff;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}
.wrap {
  max-width: 700px;
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}
h1 { font-size: 1.9rem; margin-bottom: 0.25rem; }
h2 { font-size: 1.2rem; margin-top: 2.2rem; }
.updated { color: var(--muted); font-size: 0.9rem; margin-bottom: 2rem; }
nav { margin-bottom: 2rem; font-size: 0.95rem; }
nav a { color: var(--link); text-decoration: none; margin-right: 1.2rem; }
nav a:hover { text-decoration: underline; }
a { color: var(--link); }
ul { padding-left: 1.3rem; }
li { margin-bottom: 0.5rem; }
footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}