/**
 * 门户顶栏（含选中态）
 * 主题色：gov-blue #165DFF，白底；四库收进「资源库」下拉
 */
.site-header {
  --site-blue: #165dff;
  --site-blue-dark: #0e4fd1;
  --site-text: #334155;
  --site-muted: #6b7280;
  --site-hover-bg: #f0f5ff;
  position: relative;
  z-index: 60;
  background: #fff;
  box-shadow: 0 4px 18px rgba(15, 23, 42, 0.06);
  border-bottom: 2px solid var(--site-blue);
}

.site-header-inner {
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 1rem;
  min-height: 4.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-shrink: 0;
  min-width: 0;
}

.site-brand-mark {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  background: var(--site-blue);
  box-shadow: 0 4px 12px rgba(22, 93, 255, 0.28);
  flex-shrink: 0;
}

.site-brand-mark i {
  font-size: 1.15rem;
}

.site-brand-meta {
  min-width: 0;
}

.site-brand-title {
  display: block;
  color: var(--site-blue);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.01em;
  text-decoration: none;
  white-space: nowrap;
}

.site-brand-title:hover {
  color: var(--site-blue-dark);
}

.site-brand-slogan {
  margin-top: 0.15rem;
  color: var(--site-muted);
  font-size: 0.78rem;
  line-height: 1.3;
}

.site-nav {
  display: none;
  align-items: center;
  justify-content: flex-end;
  flex: 1 1 auto;
  gap: 0.15rem 0.35rem;
  min-width: 0;
}

@media (min-width: 768px) {
  .site-nav {
    display: flex;
  }
}

.site-nav-link,
.site-nav-dropdown-trigger {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--site-text);
  font-size: 0.92rem;
  font-weight: 500;
  line-height: 1.2;
  padding: 0.55rem 0.72rem;
  border-radius: 999px;
  white-space: nowrap;
  text-decoration: none;
  cursor: pointer;
  font-family: inherit;
  transition: color 0.18s ease, background-color 0.18s ease;
}

.site-nav-link:hover,
.site-nav-dropdown-trigger:hover {
  color: var(--site-blue);
  background: var(--site-hover-bg);
}

.site-nav-link.is-active,
.site-nav-dropdown-trigger.is-active,
.site-nav-dropdown.is-active > .site-nav-dropdown-trigger {
  color: #fff;
  background: var(--site-blue);
  font-weight: 600;
}

.site-nav-link.is-active .site-nav-caret,
.site-nav-dropdown-trigger.is-active .site-nav-caret,
.site-nav-dropdown.is-active > .site-nav-dropdown-trigger .site-nav-caret {
  opacity: 0.95;
  color: #fff;
}

.site-nav-link.is-active:hover,
.site-nav-dropdown-trigger.is-active:hover,
.site-nav-dropdown.is-active > .site-nav-dropdown-trigger:hover {
  color: #fff;
  background: var(--site-blue-dark);
}

.site-nav-dropdown {
  position: relative;
}

.site-nav-dropdown-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.site-nav-caret {
  font-size: 0.65rem;
  opacity: 0.75;
  transition: transform 0.18s ease;
}

.site-nav-dropdown:hover .site-nav-caret,
.site-nav-dropdown:focus-within .site-nav-caret {
  transform: rotate(180deg);
}

.site-nav-dropdown-panel {
  position: absolute;
  top: calc(100% + 0.45rem);
  left: 0;
  min-width: 10.5rem;
  padding: 0.4rem;
  border-radius: 0.85rem;
  background: #fff;
  border: 1px solid #e5e7eb;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.12);
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity 0.16s ease, transform 0.16s ease, visibility 0.16s ease;
  z-index: 70;
}

.site-nav-dropdown:hover .site-nav-dropdown-panel,
.site-nav-dropdown:focus-within .site-nav-dropdown-panel {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.site-nav-dropdown-item {
  display: block;
  padding: 0.65rem 0.85rem;
  border-radius: 0.55rem;
  color: #334155;
  font-size: 0.9rem;
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.site-nav-dropdown-item:hover {
  background: var(--site-hover-bg);
  color: var(--site-blue);
}

.site-nav-dropdown-item.is-active {
  background: var(--site-hover-bg);
  color: var(--site-blue);
  font-weight: 600;
}

.site-header-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
}

.site-header .user-center-toggle {
  color: var(--site-text);
}

.site-header .user-center-toggle:hover {
  background-color: var(--site-hover-bg);
  color: var(--site-blue);
}

.site-header .user-center-name {
  color: inherit;
}

.site-header .user-center-caret {
  color: #9ca3af;
}

.site-header-menu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 0;
  border-radius: 0.7rem;
  background: var(--site-hover-bg);
  color: var(--site-blue);
  cursor: pointer;
}

@media (min-width: 768px) {
  .site-header-menu-btn {
    display: none;
  }
}

.site-mobile-panel {
  display: none;
  border-top: 1px solid #e5e7eb;
  background: #f8fafc;
  padding: 0.6rem 1rem 1rem;
}

.site-mobile-panel.is-open {
  display: block;
}

@media (min-width: 768px) {
  .site-mobile-panel {
    display: none !important;
  }
}

.site-mobile-link {
  display: block;
  padding: 0.7rem 0.85rem;
  border-radius: 0.65rem;
  color: var(--site-text);
  text-decoration: none;
  font-size: 0.95rem;
}

.site-mobile-link:hover {
  background: var(--site-hover-bg);
  color: var(--site-blue);
}

.site-mobile-link.is-active {
  background: var(--site-blue);
  color: #fff;
  font-weight: 600;
}

.site-mobile-group {
  margin: 0.35rem 0 0.55rem;
  padding: 0.35rem;
  border-radius: 0.75rem;
  background: #fff;
  border: 1px solid #eef2f7;
}

.site-mobile-group-title {
  padding: 0.45rem 0.75rem 0.25rem;
  color: var(--site-muted);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}

@media (max-width: 1100px) {
  .site-brand-slogan {
    display: none;
  }

  .site-brand-title {
    font-size: 1rem;
  }
}