:root {
  --bg: #ffffff;
  --fg: #1d1d1f;
  --muted: #6e6e73;
  --line: #e5e5ea;
  --card: #f5f5f7;
  --accent: #2f7fe6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --fg: #f5f5f7;
    --muted: #a1a1a6;
    --line: #2c2c2e;
    --card: #1c1c1e;
    --accent: #5aa0ff;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  overflow-wrap: break-word;
}
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 48px; }
h1 { font-size: 28px; line-height: 1.3; margin: 0 0 4px; }
h2 { font-size: 19px; margin: 32px 0 8px; }
h3 { font-size: 16px; margin: 20px 0 4px; }
p, li { margin: 6px 0; }
ul { padding-left: 20px; }
a { color: var(--accent); }
hr { border: 0; border-top: 1px solid var(--line); margin: 48px 0; }

.meta { color: var(--muted); font-size: 14px; }
.lead { font-size: 17px; }
.crumbs { font-size: 14px; color: var(--muted); margin-bottom: 24px; }

.card {
  background: var(--card);
  border-radius: 14px;
  padding: 16px 18px;
  margin: 12px 0;
}
.card h3 { margin-top: 0; }
.card .links { font-size: 15px; margin-bottom: 0; }

.site-footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px 16px 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}
.site-footer p { margin: 2px 0; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }