:root {
  --bg: #fbfbfa;
  --fg: #1f2328;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #2563eb;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.site-header {
  max-width: 760px; margin: 0 auto; padding: 28px 24px 12px;
  display: flex; align-items: baseline; justify-content: space-between; gap: 16px;
  border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; font-size: 20px; color: var(--fg); letter-spacing: .5px; }
.site-header nav a { margin-left: 18px; color: var(--muted); font-size: 14px; }
main { max-width: 760px; margin: 0 auto; padding: 36px 24px 64px; }
h1 { font-size: 30px; line-height: 1.35; margin: 0 0 24px; }
h2 { font-size: 22px; margin: 36px 0 12px; }
h3 { font-size: 18px; margin: 28px 0 10px; }
p { margin: 0 0 18px; }
.meta { color: var(--muted); font-size: 13px; margin: -12px 0 24px; }
.card { padding: 20px 0; border-bottom: 1px solid var(--line); }
.card h2 { margin: 0 0 6px; font-size: 20px; }
.card .meta { margin: 0 0 10px; }
.card p { margin: 0; color: #374151; }
blockquote {
  margin: 20px 0; padding: 2px 18px; border-left: 3px solid var(--line); color: var(--muted);
}
pre {
  background: #f3f4f6; padding: 16px; border-radius: 8px; overflow-x: auto;
  font-size: 13.5px; line-height: 1.6;
}
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 90%; }
p code, li code { background: #f3f4f6; padding: 2px 6px; border-radius: 4px; }
ul { padding-left: 22px; margin: 0 0 18px; }
li { margin: 6px 0; }
hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; }
.back { margin-top: 48px; font-size: 14px; }
.site-footer p { margin: 4px 0; }
.icp a { color: var(--muted); font-size: 12.5px; }
.site-footer {
  max-width: 760px; margin: 0 auto; padding: 24px;
  border-top: 1px solid var(--line); color: var(--muted); font-size: 13px;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #16181d; --fg: #e6e8eb; --muted: #9aa4b2; --line: #2a2f38; --accent: #6ea8fe; }
  pre, p code, li code { background: #21262e; }
  .card p { color: #c7cdd6; }
}
@media (max-width: 600px) {
  h1 { font-size: 24px; }
  main { padding: 24px 18px 48px; }
}