:root {
  color-scheme: light;
  --text: #1a1a1a;
  --muted: #5c5c5c;
  --border: #e8e8e8;
  --bg: #f7f8fa;
  --card: #ffffff;
  --link: #1565c0;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}
.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 20px 48px;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px 24px;
}
h1 {
  margin: 0 0 8px;
  font-size: 1.5rem;
  font-weight: 700;
}
h2 {
  margin: 28px 0 10px;
  font-size: 1.05rem;
  font-weight: 650;
}
.meta {
  margin: 0 0 20px;
  font-size: 0.875rem;
  color: var(--muted);
}
nav.top {
  margin-bottom: 20px;
  font-size: 0.875rem;
}
nav.top a {
  color: var(--link);
  text-decoration: none;
  margin-right: 16px;
}
nav.top a[aria-current="page"] { font-weight: 600; }
nav.top a:hover { text-decoration: underline; }
p { margin: 0 0 12px; }
ul { margin: 0 0 12px; padding-left: 1.2rem; }
li { margin: 0 0 6px; }
.links { list-style: none; padding: 0; }
.links li { margin: 0 0 10px; }
a { color: var(--link); }
footer {
  margin-top: 24px;
  font-size: 0.8125rem;
  color: var(--muted);
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --text: #ececec;
    --muted: #a0a0a0;
    --border: #333;
    --bg: #111;
    --card: #1c1c1e;
    --link: #6eb6ff;
  }
}