:root {
  --bg: #ffffff;
  --text: #1f2328;
  --muted: #59636e;
  --link: #0969da;
  --border: #d1d9e0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --text: #e6edf3;
    --muted: #9198a1;
    --link: #4493f8;
    --border: #3d444d;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

h1 {
  margin-bottom: 4px;
  line-height: 1.25;
}

h2 {
  margin-top: 32px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border);
  font-size: 1.25rem;
}

a {
  color: var(--link);
}

.meta {
  margin-top: 0;
  color: var(--muted);
}

.lang {
  text-align: right;
  font-size: 0.9rem;
}