/* ============================================
   导航栏 & 页脚（企业级设计语言）
   ============================================ */

.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(12px);
  box-shadow: 0 8px 24px rgba(10, 34, 71, 0.08);
}

.navbar-top {
  background: linear-gradient(90deg, rgba(9, 48, 116, 0.95) 0%, rgba(9, 94, 121, 0.95) 100%);
  color: var(--text-white);
  font-size: 13px;
}

.navbar-top-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  gap: var(--spacing-xl);
}

.navbar-tagline {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.navbar-tagline::before {
  content: '';
  width: 32px;
  height: 1px;
  background-color: rgba(255, 255, 255, 0.3);
}

.navbar-top-links {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.navbar-top-link {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  transition: color var(--transition-base);
}

.navbar-top-link:hover {
  color: var(--text-white);
}

.navbar-top-separator {
  color: rgba(255, 255, 255, 0.4);
}

.navbar-main {
  background-color: rgba(255, 255, 255, 0.98);
}

.navbar-main-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-4xl);
  padding: var(--spacing-xl) 0;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  text-decoration: none;
  color: var(--text-dark);
}

.logo-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.logo-name {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--primary-900);
}

.logo-subtitle {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-light);
  text-transform: uppercase;
}

.navbar-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 48px;
  height: 48px;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--bg-white);
  cursor: pointer;
  transition: all var(--transition-base);
}

.navbar-toggle span {
  width: 22px;
  height: 2px;
  background-color: var(--primary-800);
  margin: 3px 0;
  transition: transform var(--transition-base);
}

.navbar-toggle.active span:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.navbar-toggle.active span:nth-child(2) {
  opacity: 0;
}

.navbar-toggle.active span:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.navbar-menu-wrapper {
  display: flex;
  align-items: center;
  gap: var(--spacing-4xl);
  flex: 1;
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-2xl);
  list-style: none;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-weight: var(--font-weight-medium);
  color: var(--text-dark);
  text-decoration: none;
  padding: var(--spacing-sm) 0;
  position: relative;
  transition: color var(--transition-base);
  background: none;
  border: none;
  cursor: pointer;
}

.nav-link:focus-visible {
  outline: 2px solid rgba(86, 138, 255, 0.4);
  outline-offset: 4px;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-600), var(--secondary-500));
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--transition-base);
}

.nav-link:hover,
.nav-item.active > .nav-link,
.nav-link.active {
  color: var(--primary-700);
}

.nav-link:hover::after,
.nav-link.active::after,
.nav-item.active > .nav-link::after {
  transform: scaleX(1);
}

.dropdown-icon {
  font-size: 12px;
  transition: transform var(--transition-base);
}

.has-dropdown.open > .nav-link .dropdown-icon {
  transform: rotate(-180deg);
}

.dropdown-panel {
  position: absolute;
  top: calc(100% + 18px);
  left: 50%;
  transform: translateX(-50%) scaleY(0.9);
  transform-origin: top center;
  background-color: var(--bg-white);
  border-radius: var(--radius-lg);
  box-shadow: 0 30px 60px rgba(10, 34, 71, 0.12);
  min-width: 280px;
  padding: var(--spacing-lg);
  display: grid;
  gap: var(--spacing-md);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-base);
}

.dropdown-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  text-decoration: none;
  background-color: var(--bg-white);
  transition: all var(--transition-base);
}

.dropdown-title {
  font-weight: var(--font-weight-semibold);
  color: var(--primary-800);
}

.dropdown-meta {
  font-size: 13px;
  color: var(--text-light);
  line-height: 1.4;
}

.dropdown-link:hover {
  background: linear-gradient(90deg, rgba(15, 76, 147, 0.08), rgba(22, 121, 145, 0.08));
  transform: translateX(4px);
}

.has-dropdown.open > .dropdown-panel,
.nav-item:hover > .dropdown-panel {
  opacity: 1;
  transform: translateX(-50%) scaleY(1);
  pointer-events: auto;
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.navbar-actions .btn {
  white-space: nowrap;
}

/* 页脚 */

.site-footer {
  background: radial-gradient(circle at top left, rgba(11, 56, 124, 0.12), transparent 60%),
              linear-gradient(180deg, rgba(5, 23, 52, 0.94) 0%, rgba(8, 34, 78, 0.98) 100%);
  color: rgba(255, 255, 255, 0.88);
  margin-top: var(--spacing-5xl);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at right top, rgba(29, 130, 174, 0.18), transparent 55%);
  opacity: 0.9;
}

.footer-top {
  position: relative;
  padding: var(--spacing-5xl) 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr repeat(3, 1fr);
  gap: var(--spacing-4xl);
}

.footer-brand,
.footer-column {
  position: relative;
  transform: translateY(24px);
  opacity: 0;
  transition: all 600ms ease;
}

.footer-brand.in-view,
.footer-column.in-view {
  transform: translateY(0);
  opacity: 1;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--secondary-400), var(--secondary-600));
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.12em;
  margin-bottom: var(--spacing-lg);
}

.footer-brand h4 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-md);
  color: var(--text-white);
}

.footer-brand p {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.7;
  margin-bottom: var(--spacing-2xl);
}

.footer-hotline {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.footer-hotline .label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.5);
}

.footer-hotline a {
  color: var(--text-white);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
}

.footer-column h5 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xl);
  color: var(--text-white);
  position: relative;
}

.footer-column h5::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -12px;
  width: 32px;
  height: 3px;
  background: linear-gradient(90deg, var(--secondary-400), transparent);
  border-radius: var(--radius-full);
}

.footer-column ul {
  list-style: none;
  display: grid;
  gap: var(--spacing-md);
}

.footer-column ul li a {
  color: rgba(255, 255, 255, 0.72);
  text-decoration: none;
  transition: color var(--transition-base), transform var(--transition-base);
}

.footer-column ul li a:hover {
  color: var(--text-white);
  transform: translateX(4px);
}

.footer-contact {
  display: grid;
  gap: var(--spacing-md);
}

.contact-label {
  color: rgba(255, 255, 255, 0.5);
  margin-right: var(--spacing-sm);
}

.footer-newsletter {
  margin-top: var(--spacing-2xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
}

.footer-newsletter span {
  color: rgba(255, 255, 255, 0.7);
}

.footer-bottom {
  position: relative;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: var(--spacing-xl) 0;
}

.footer-bottom-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  color: rgba(255, 255, 255, 0.5);
  font-size: 13px;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  transition: color var(--transition-base);
}

.footer-links a:hover {
  color: var(--text-white);
}

/* 响应式设计 */

@media (max-width: 1200px) {
  .navbar-main-content {
    gap: var(--spacing-2xl);
  }

  .navbar-menu {
    gap: var(--spacing-xl);
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 992px) {
  .navbar {
    position: relative;
  }

  .navbar-top {
    display: none;
  }

  .navbar-main-content {
    flex-wrap: wrap;
    gap: var(--spacing-lg);
  }

  .navbar-toggle {
    display: flex;
  }

  .navbar-menu-wrapper {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
  }

  .navbar-menu-wrapper.active {
    padding: var(--spacing-xl);
    max-height: 660px;
  }

  .navbar-menu {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-sm);
  }

  .nav-link {
    padding: var(--spacing-md) 0;
    width: 100%;
  }

  .nav-link::after {
    bottom: 0;
  }

  .dropdown-panel {
    position: static;
    transform: none;
    opacity: 1;
    pointer-events: auto;
    box-shadow: none;
    border: 1px solid var(--border-light);
    margin: 0 0 var(--spacing-sm);
    display: none;
  }

  .has-dropdown.open > .dropdown-panel {
    display: grid;
  }

  .navbar-actions {
    justify-content: stretch;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }

  .navbar-actions .btn {
    flex: 1;
    justify-content: center;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-newsletter {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 576px) {
  .navbar-main-content {
    padding: var(--spacing-md) 0;
  }

  .logo-name {
    font-size: var(--font-size-base);
  }

  .footer-bottom-content {
    flex-direction: column;
    align-items: flex-start;
  }
}