/* No external fonts, scripts or CDNs: Google Fonts and most CDNs are blocked or slow
   inside mainland China, and Baidu ranks slow first paints down. System CJK fonts only. */
:root {
  --bg: #fbf9f6;
  --fg: #1d1b19;
  --muted: #6a645c;
  --accent: #b91c1c;
  --accent-ink: #ffffff;
  --card: #ffffff;
  --line: #e6e0d8;
  --soft: #f3eee7;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171514;
    --fg: #ece8e2;
    --muted: #a39b91;
    --accent: #ef6a5e;
    --accent-ink: #1a0b09;
    --card: #1f1c1a;
    --line: #34302c;
    --soft: #25211e;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font, system-ui, sans-serif);
  font-size: 17px;
  line-height: 1.9;
  letter-spacing: 0.01em;
}
a { color: var(--accent); text-underline-offset: 3px; }
.wrap { max-width: 720px; margin: 0 auto; padding: 0 16px; }
header.site { border-bottom: 1px solid var(--line); background: var(--card); }
header.site .wrap { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; padding-top: 14px; padding-bottom: 14px; }
header.site a.brand { font-weight: 700; font-size: 18px; color: var(--fg); text-decoration: none; }
header.site a.brand span { color: var(--accent); }
header.site nav a { font-size: 15px; color: var(--muted); text-decoration: none; }
nav.crumbs { font-size: 14px; color: var(--muted); padding: 18px 0 0; line-height: 1.5; }
nav.crumbs a { color: var(--muted); }
main { padding: 8px 0 56px; }
h1 { font-size: 28px; line-height: 1.4; margin: 20px 0 6px; }
h2 { font-size: 21px; line-height: 1.5; margin: 40px 0 8px; padding-top: 4px; }
h3 { font-size: 18px; margin: 28px 0 4px; }
p { margin: 14px 0; }
ul, ol { padding-left: 1.4em; margin: 14px 0; }
li { margin: 6px 0; }
.meta { font-size: 14px; color: var(--muted); margin: 0 0 20px; }
.tbl { overflow-x: auto; margin: 18px 0; border: 1px solid var(--line); border-radius: 10px; background: var(--card); }
table { border-collapse: collapse; width: 100%; min-width: 520px; font-size: 15px; line-height: 1.7; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { background: var(--soft); font-weight: 600; }
tr:last-child td { border-bottom: 0; }
.cta { margin: 44px 0 8px; padding: 22px 20px; border-radius: 14px; background: var(--soft); border: 1px solid var(--line); }
.cta h2 { margin: 0 0 6px; font-size: 19px; padding: 0; }
.cta p { margin: 8px 0 16px; font-size: 16px; }
.cta a.btn { display: inline-block; padding: 12px 20px; border-radius: 10px; background: var(--accent); color: var(--accent-ink); font-weight: 700; text-decoration: none; }
ul.posts { list-style: none; padding: 0; margin: 20px 0; }
ul.posts li { margin: 0; padding: 18px 0; border-bottom: 1px solid var(--line); }
ul.posts a.t { display: block; font-size: 19px; font-weight: 700; line-height: 1.5; color: var(--fg); text-decoration: none; }
ul.posts p { margin: 6px 0 0; font-size: 15px; color: var(--muted); line-height: 1.7; }
.hub { display: grid; gap: 14px; margin: 28px 0; }
.hub a { display: block; padding: 20px; border: 1px solid var(--line); border-radius: 14px; background: var(--card); color: var(--fg); text-decoration: none; }
.hub a b { display: block; font-size: 20px; margin-bottom: 4px; }
.hub a span { color: var(--muted); font-size: 15px; line-height: 1.6; }
footer.site { border-top: 1px solid var(--line); padding: 24px 0 40px; font-size: 14px; color: var(--muted); line-height: 1.8; }
footer.site p { margin: 6px 0; }
@media (max-width: 480px) {
  body { font-size: 16px; }
  h1 { font-size: 24px; }
  h2 { font-size: 20px; }
}