* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  background: #f5f7fb;
  color: #1f2937;
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
.wrapper { max-width: 720px; margin: 0 auto; padding: 24px 20px 40px; }
.subpage-topbar { margin-bottom: 20px; display: flex; flex-direction: column; gap: 4px; }
.subpage-brand { font-size: 20px; font-weight: 700; color: #111827; letter-spacing: 0.3px; }
.subpage-brand:hover { color: #2563eb; }
.subpage-brand-sub { font-size: 13px; color: #6b7280; }
.breadcrumb {
  font-size: 13px; color: #6b7280; margin-bottom: 10px;
  padding: 0 4px; display: flex; flex-wrap: wrap; align-items: center; gap: 6px;
}
.breadcrumb a { color: #2563eb; }
.breadcrumb a:hover { text-decoration: underline; }
.card {
  background: #fff; border-radius: 16px;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
  padding: 24px 22px; margin-bottom: 16px;
}
.card h1 {
  font-size: 22px; font-weight: 700; color: #111827;
  margin-bottom: 12px; line-height: 1.35; word-break: break-word;
}
.card h2 {
  font-size: 16px; font-weight: 700; color: #111827;
  margin-bottom: 12px; padding-bottom: 8px; border-bottom: 1px solid #e5e7eb;
}
.intro-body p {
  font-size: 14px; color: #374151; line-height: 1.75; margin-bottom: 12px;
}
.intro-body p:last-child { margin-bottom: 0; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 18px; border-radius: 999px; font-size: 14px; font-weight: 600;
  background: #2563eb; color: #fff; transition: background 0.15s ease;
}
.btn:hover { background: #1d4ed8; }
.btn.ghost { background: #f1f5f9; color: #1f2937; }
.btn.ghost:hover { background: #e2e8f0; }
.tag-cloud-mini { display: flex; flex-wrap: wrap; gap: 8px 10px; }
.site-tag-mini {
  display: inline-flex; padding: 6px 12px; font-size: 13px; font-weight: 500;
  color: #374151; background: #f8fafc; border: 1px solid #e2e8f0;
  border-radius: 999px;
  transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.site-tag-mini:hover { border-color: #bfdbfe; background: #eff6ff; color: #1d4ed8; }
.footer {
  margin-top: 24px; text-align: center; font-size: 12px;
  color: #6b7280; line-height: 1.6;
}
.footer a { color: #2563eb; }
.footer a:hover { text-decoration: underline; }
@media (max-width: 720px) {
  .wrapper { padding: 20px 12px 28px; }
  .card { padding: 20px 16px; }
}