/* 共享顶部导航 */
.site-nav {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 14px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.site-nav .brand {
  font-size: 13.5px;
  font-weight: 800;
  color: var(--ink);
  text-decoration: none;
  margin-right: 14px;
  white-space: nowrap;
  letter-spacing: -0.01em;
}

.site-nav .brand:hover { color: var(--brand); }

.site-nav .nav-tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.site-nav .nav-tab {
  padding: 6px 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  color: var(--sub);
  border: 1px solid transparent;
  transition: all .15s;
}

.site-nav .nav-tab:hover {
  background: #f1f4fa;
  color: var(--ink);
}

.site-nav .nav-tab.active-local {
  background: #e8f5ee;
  color: var(--ok);
  border-color: #a7dcc8;
}

.site-nav .nav-tab.active-policy {
  background: #eef4ff;
  color: var(--brand);
  border-color: #c9d9ff;
}

.site-nav .nav-sub {
  margin-left: auto;
  display: flex;
  gap: 4px;
}

.site-nav .nav-sub .chip {
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  text-decoration: none;
  color: var(--sub);
  border: 1px solid var(--line);
  transition: all 0.15s;
}

.site-nav .nav-sub .chip.on {
  background: var(--brand);
  color: #fff;
  border-color: var(--brand);
}

.site-nav .nav-sub .chip.on-edu {
  background: var(--t1);
  color: #fff;
  border-color: var(--t1);
}

@media (max-width: 720px) {
  .site-nav .nav-sub { margin-left: 0; width: 100%; }
}