:root {
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --brand: #2563eb;
  --brand-dark: #1d4ed8;
  --soft: #f8fafc;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  line-height: 1.8;
  background: var(--soft);
}
a { color: var(--brand); }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }
header.hero {
  background: linear-gradient(135deg, #0f172a, #1e3a8a);
  color: #fff;
  padding: 62px 0 54px;
}
header.hero h1 { font-size: 32px; line-height: 1.35; margin: 0 0 12px; }
header.hero p { color: #cbd5e1; margin: 0; max-width: 720px; }
.tag {
  display: inline-block;
  font-size: 12px;
  letter-spacing: .08em;
  color: #bfdbfe;
  border: 1px solid rgba(191, 219, 254, .45);
  border-radius: 999px;
  padding: 3px 12px;
  margin-bottom: 16px;
}
nav.top {
  background: #fff;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 20;
}
nav.top .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  padding-top: 13px;
  padding-bottom: 13px;
  font-size: 14px;
}
nav.top a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
  padding: 2px 0;
  border-bottom: 2px solid transparent;
}
nav.top a:hover, nav.top a.active { color: var(--brand); border-color: var(--brand); }
main { padding: 38px 0 60px; }
section.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px;
  margin-bottom: 20px;
}
h2 { font-size: 22px; margin: 0 0 14px; }
h3 { font-size: 16px; margin: 22px 0 8px; }
p { margin: 0 0 12px; }
p:last-child { margin-bottom: 0; }
ul, ol { margin: 0 0 12px; padding-left: 22px; }
li { margin: 6px 0; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}
.item {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px;
  background: var(--soft);
}
.item h3 { margin: 0 0 6px; font-size: 15px; }
.item p { margin: 0; color: var(--muted); font-size: 13px; }
.notice {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1e40af;
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 13px;
}
.warn {
  background: #fff7ed;
  border: 1px solid #fed7aa;
  color: #9a3412;
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 13px;
}
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { border: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
th { background: var(--soft); font-weight: 600; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.btn {
  display: inline-block;
  text-decoration: none;
  font-weight: 700;
  font-size: 14px;
  border-radius: 10px;
  padding: 10px 18px;
  border: 1px solid var(--brand);
  color: #fff;
  background: var(--brand);
}
.btn:hover { background: var(--brand-dark); }
.btn.ghost { background: #fff; color: var(--brand); }
.btn.ghost:hover { background: #eff6ff; }
.crumb { font-size: 13px; color: var(--muted); margin-bottom: 16px; }
.crumb a { color: var(--muted); text-decoration: none; }
.crumb a:hover { color: var(--brand); }
footer.site {
  border-top: 1px solid var(--line);
  background: #fff;
  padding: 28px 0 34px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.95;
}
footer.site .cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px 32px;
}
footer.site strong { color: var(--ink); display: block; margin-bottom: 6px; }
footer.site a { color: var(--muted); text-decoration: none; }
footer.site a:hover { color: var(--brand); }
footer.site .links a { margin-right: 14px; white-space: nowrap; }
.copyright { margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); text-align: center; }
@media (max-width: 640px) {
  header.hero { padding: 42px 0 38px; }
  header.hero h1 { font-size: 24px; }
  section.card { padding: 20px; }
}