:root {
  --ink: #172033;
  --muted: #5b6577;
  --line: #e1e8ec;
  --soft: #f5f7f8;
  --brand: #1d4ed8;
  --brandsoft: #e8eefc;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--soft);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.7;
}
main { max-width: 1040px; margin: 0 auto; padding: 32px 24px 64px; }
header, section { border: 1px solid var(--line); border-radius: 12px; background: #fff; }
header { padding: 30px; }
section { margin-top: 18px; padding: 24px; }
h1 { margin: 6px 0 12px; font-size: 30px; line-height: 1.3; }
h2 { margin: 0 0 14px; font-size: 21px; }
h3 { margin: 0 0 6px; font-size: 17px; }
p { margin: 0 0 10px; }
.lead { color: var(--muted); font-size: 16px; }
.tag {
  display: inline-flex;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--brandsoft);
  color: var(--brand);
  font-weight: 700;
  font-size: 13px;
}
.tldr {
  background: #eef3ff;
  border-left: 3px solid var(--brand);
  padding: 12px 16px;
  border-radius: 6px;
  margin: 0 0 14px;
  color: #234;
}
.qa, .product, .card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px 20px;
  background: #fbfdfe;
  margin-top: 14px;
}
.qa h3, .product h3 { margin: 0 0 8px; }
.qa .src, .muted { color: var(--muted); font-size: 13px; }
.qa .src a, a { color: var(--brand); }
nav.bc { font-size: 13px; color: var(--muted); margin-bottom: 6px; }
nav.links { margin-top: 12px; font-size: 14px; }
nav.links a { margin-right: 12px; }
ul, ol { margin: 6px 0; padding-left: 20px; color: #2b3445; }
li + li { margin-top: 6px; }
table { width: 100%; border-collapse: collapse; margin-top: 6px; font-size: 14px; }
th, td { border: 1px solid var(--line); padding: 9px 12px; text-align: left; vertical-align: top; }
th { background: #f3f6f7; }
.product dl { display: grid; grid-template-columns: 104px 1fr; gap: 6px 14px; margin: 8px 0 0; }
.product dt { color: var(--muted); font-size: 13px; }
.product dd { margin: 0; }
.disclaimer {
  margin-top: 18px;
  padding: 14px 16px;
  border: 1px solid #f1d4a6;
  background: #fff8eb;
  border-radius: 8px;
  color: #6b4a12;
  font-size: 13px;
}
footer.site {
  margin-top: 18px;
  color: var(--muted);
  font-size: 12px;
}
@media (max-width: 760px) {
  main { padding: 18px; }
  h1 { font-size: 24px; }
  .product dl { grid-template-columns: 1fr; }
}