/* ===== 站点头部与导航 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: white;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.site-header.scrolled {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.topbar {
  position: fixed;
  right: 24px;
  top: 160px;
  background: #ffffff;
  color: var(--text-primary);
  width: 240px;
  padding: var(--spacing-xl) var(--spacing-lg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  z-index: 1100;
  transition: right 0.3s ease, box-shadow var(--transition-fast);
}

.topbar-container {
  display: grid;
  gap: var(--spacing-lg);
}

.topbar-info {
  display: grid;
  gap: var(--spacing-md);
}

.topbar-info span {
  display: grid;
  gap: 6px;
  font-size: var(--font-size-sm);
  line-height: 1.6;
}

.topbar-info strong {
  font-size: var(--font-size-sm);
  color: var(--text-primary);
  letter-spacing: 0.4px;
}

.topbar-info a {
  color: var(--primary-color);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
}

.topbar-info a:hover {
  color: var(--hover-color);
}

.topbar-links {
  display: grid;
  gap: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid var(--border-color);
}

.topbar-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-full);
  background: var(--light-color);
  color: var(--primary-color);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  transition: all var(--transition-fast);
}

.topbar-links a:hover {
  background: rgba(46, 139, 87, 0.15);
  color: var(--hover-color);
}

.topbar-highlight {
  background: var(--primary-color);
  color: white !important;
}

.topbar-highlight:hover {
  background: var(--hover-color);
  color: white !important;
}

.topbar-toggle {
  position: absolute;
  left: -36px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  border: none;
  background: var(--primary-color);
  color: white;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.topbar-toggle:hover {
  background: var(--hover-color);
}

.topbar--collapsed {
  right: calc(-100% + 44px);
}

.topbar--collapsed .topbar-toggle {
  transform: translateY(-50%) rotate(180deg);
}

@media (max-width: 992px) {
  .topbar {
    display: none;
  }
}

.navbar {
  background-color: white;
  transition: all var(--transition-fast);
}

.navbar-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  min-height: 90px;
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

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

.site-header .brand-mark {
  display: none;
}

.navbar-brand:hover .brand-title {
  color: var(--hover-color);
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(46, 139, 87, 0.18), rgba(46, 139, 87, 0.4));
  color: var(--primary-color);
  font-weight: var(--font-weight-bold);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
}

.brand-subtitle {
  font-size: var(--font-size-xs);
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.navbar-menu {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xl);
  list-style: none;
}

.navbar-item {
  position: relative;
}

.navbar-link {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-md) 0;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  position: relative;
  transition: color var(--transition-fast);
}

.navbar-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -12px;
  width: 100%;
  height: 3px;
  background: var(--primary-color);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-fast);
}

.navbar-link:hover {
  color: var(--primary-color);
}

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

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

.navbar-hotline {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  line-height: 1.2;
}

.navbar-hotline span {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  letter-spacing: 1px;
  text-transform: uppercase;
}

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

.navbar-hotline a:hover {
  color: var(--hover-color);
}

.navbar-cta {
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-full);
  border: 1px solid rgba(46, 139, 87, 0.4);
  color: var(--primary-color);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.navbar-cta:hover {
  background: var(--primary-color);
  color: white;
  box-shadow: var(--shadow-md);
}

/* ===== 下拉菜单 ===== */
.dropdown {
  position: relative;
}

.dropdown-toggle::after {
  content: '▾';
  font-size: 12px;
  color: var(--text-secondary);
  margin-left: var(--spacing-xs);
  transition: transform var(--transition-fast);
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--spacing-md));
  left: 0;
  min-width: 220px;
  list-style: none;
  padding: var(--spacing-sm) 0;
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  border: 1px solid rgba(46, 139, 87, 0.08);
}

.dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: block;
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.dropdown-item:hover {
  background-color: rgba(46, 139, 87, 0.08);
  color: var(--primary-color);
  padding-left: calc(var(--spacing-lg) + 6px);
}

/* ===== 汉堡菜单 ===== */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(46, 139, 87, 0.25);
  transition: all var(--transition-fast);
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.hamburger:hover {
  border-color: var(--primary-color);
  background: rgba(46, 139, 87, 0.08);
}

.hamburger.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

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

.hamburger.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ===== 页脚 ===== */
.footer {
  background: #102820;
  color: #cee7d8;
  padding: var(--spacing-3xl) var(--container-padding);
  margin-top: var(--spacing-3xl);
}

.footer-container {
  max-width: var(--container-width);
  margin: 0 auto;
  display: grid;
  gap: var(--spacing-2xl);
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-xl);
  flex-wrap: wrap;
  padding-bottom: var(--spacing-2xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.footer-brand .brand-mark {
  background: rgba(255, 255, 255, 0.08);
  color: white;
}

.footer-brand-text {
  display: grid;
  gap: var(--spacing-xs);
}

.footer-brand-text strong {
  font-size: var(--font-size-xl);
  color: white;
}

.footer-brand-text span {
  font-size: var(--font-size-sm);
  color: #a8c2b4;
}

.footer-cta {
  display: grid;
  gap: var(--spacing-sm);
  text-align: right;
}

.footer-cta h3 {
  color: white;
  margin: 0;
}

.footer-cta p {
  margin: 0;
  color: rgba(255, 255, 255, 0.7);
}

.footer-cta-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  margin-top: var(--spacing-sm);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--spacing-xl);
}

.footer-column h4 {
  color: white;
  margin-bottom: var(--spacing-lg);
}

.footer-column ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--spacing-sm);
}

.footer-column a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color var(--transition-fast), transform var(--transition-fast);
}

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

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

.footer-contact li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-contact strong {
  color: white;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.6);
}

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

.footer-bottom-links a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
}

.footer-bottom-links a:hover {
  color: white;
}

.footer-social {
  display: flex;
  gap: var(--spacing-md);
}

.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.3);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.footer-social a:hover {
  background: white;
  color: var(--primary-color);
  transform: translateY(-4px);
}

/* ===== 返回顶部按钮 ===== */
.back-to-top {
  position: fixed;
  right: 32px;
  bottom: 32px;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  border: none;
  background: var(--primary-color);
  color: white;
  font-size: 22px;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  transition: transform var(--transition-fast), background var(--transition-fast);
  z-index: 999;
}

.back-to-top:hover {
  background: var(--hover-color);
  transform: translateY(-4px);
}

/* ===== 响应式导航与页脚 ===== */
@media (max-width: 1200px) {
  .navbar-container {
    gap: var(--spacing-lg);
  }

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

@media (max-width: 1024px) {
  .navbar-container {
    min-height: 80px;
  }

  .navbar-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background-color: white;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal), padding var(--transition-fast);
    padding: 0;
    z-index: 998;
  }

  .navbar-menu.active {
    max-height: 600px;
    padding: var(--spacing-md) 0;
  }

  .navbar-item {
    width: 100%;
  }

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

  .navbar-link::after {
    display: none;
  }

  .topbar-container {
    justify-content: center;
    text-align: center;
  }

  .navbar-actions {
    display: none;
  }

  .hamburger {
    display: flex;
    margin-left: auto;
  }

  .dropdown-menu {
    position: static;
    opacity: 0;
    visibility: hidden;
    max-height: 0;
    transform: none;
    box-shadow: none;
    border: none;
    background: rgba(46, 139, 87, 0.08);
    width: 100%;
  }

  .dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    max-height: 400px;
  }

  .dropdown-item {
    padding-left: calc(var(--spacing-xl) * 1.2);
  }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .site-header.scrolled {
    transform: translateY(0);
  }

  .topbar {
    display: none;
  }

  .navbar-container {
    padding: 0 var(--container-padding);
  }

  .footer {
    padding: var(--spacing-2xl) var(--container-padding);
  }

  .footer-top {
    flex-direction: column;
    text-align: center;
  }

  .footer-cta {
    text-align: center;
  }

  .footer-cta-actions {
    justify-content: center;
  }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .footer-bottom-links {
    justify-content: center;
  }

  .back-to-top {
    right: 16px;
    bottom: 16px;
  }
}