:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #1c2330;
  --muted: #5b6577;
  --border: #e3e7ee;
  --accent: #128c4a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11151c;
    --surface: #181e27;
    --text: #e6e9ef;
    --muted: #9aa4b5;
    --border: #2a3240;
    --accent: #3ccf7f;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
header, main, footer { max-width: 820px; margin: 0 auto; padding: 0 16px; }
header { padding-top: 28px; display: flex; flex-wrap: wrap; gap: 12px 24px; align-items: baseline; }
header .brand { font-weight: 700; font-size: 1.15rem; color: var(--text); text-decoration: none; }
header nav { display: flex; flex-wrap: wrap; gap: 16px; }
header nav a { color: var(--muted); text-decoration: none; font-size: .95rem; }
header nav a:hover, header nav a[aria-current] { color: var(--accent); }
main {
  margin-top: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px clamp(16px, 4vw, 40px);
}
h1 { font-size: 1.7rem; line-height: 1.25; margin: 0 0 4px; }
h2 { font-size: 1.15rem; margin: 32px 0 8px; }
.updated { color: var(--muted); font-size: .9rem; margin: 0 0 24px; }
a { color: var(--accent); }
ul, ol { padding-left: 1.3rem; }
li { margin: 4px 0; }
.box {
  border-left: 3px solid var(--accent);
  background: var(--bg);
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
}
footer { color: var(--muted); font-size: .85rem; padding-top: 20px; padding-bottom: 40px; }