/* 
 * 头部与导航栏样式
 * 设计理念：工程专业、安全可信、清晰的层级导航
 */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-fixed);
  background: var(--neutral-white);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal), background-color var(--transition-normal);
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-lg);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(6px);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
  padding: var(--spacing-md) calc(var(--spacing-2xl));
  background: linear-gradient(90deg, var(--primary-dark) 0%, var(--primary-main) 60%, #233468 100%);
  color: var(--neutral-white);
  font-size: var(--font-size-sm);
}

.topbar-left,
.topbar-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.topbar a {
  color: var(--neutral-white);
  font-weight: var(--font-weight-semibold);
}

.topbar a:hover {
  color: var(--accent-gold-light);
}

.topbar-label {
  opacity: 0.85;
}

.topbar-divider {
  width: 1px;
  height: 14px;
  background: rgba(255, 255, 255, 0.4);
  display: inline-flex;
}

.topbar-cta {
  padding: 6px 14px;
  background: var(--accent-gold);
  color: var(--neutral-black);
  border-radius: var(--radius-full);
  font-weight: var(--font-weight-bold);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.topbar-cta:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-xs);
  background: rgba(245, 158, 11, 0.12);
  color: var(--accent-gold);
}

.badge-ghost {
  border: 1px solid rgba(255, 255, 255, 0.35);
  color: var(--neutral-white);
  background: rgba(255, 255, 255, 0.1);
}

.navbar {
  position: relative;
  height: 88px;
  background-color: var(--neutral-white);
  transition: all var(--transition-normal);
}

.navbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  gap: var(--spacing-xl);
}

/* ============ Logo ============ */
.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  text-decoration: none;
  color: var(--primary-dark);
  transition: color var(--transition-fast);
}

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

.navbar-logo-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-main) 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--neutral-white);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  box-shadow: var(--shadow-md);
}

.navbar-logo-texts {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.navbar-logo-text {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-extrabold);
  letter-spacing: -0.01em;
}

.navbar-logo-texts small {
  color: var(--neutral-medium-gray);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

/* ============ 导航菜单 ============ */
.navbar-collapse {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-3xl);
  flex: 1;
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  margin: 0;
  padding: 0;
  align-items: center;
}

.navbar-item {
  position: relative;
}

.navbar-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-md) var(--spacing-md);
  color: var(--neutral-dark-gray);
  text-decoration: none;
  font-weight: var(--font-weight-semibold);
  transition: color var(--transition-fast), border-bottom-color var(--transition-fast);
  border-bottom: 3px solid transparent;
}

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

.navbar-item.active > .navbar-link {
  color: var(--primary-main);
  border-bottom-color: var(--primary-main);
}

.nav-arrow {
  font-size: var(--font-size-xs);
  color: var(--neutral-medium-gray);
}

/* ============ 下拉菜单 ============ */
.navbar-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  background-color: var(--neutral-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  min-width: 220px;
  padding: var(--spacing-lg) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: all var(--transition-normal);
  z-index: var(--z-dropdown);
}

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

.navbar-dropdown-item {
  display: block;
  padding: var(--spacing-md) var(--spacing-xl);
  color: var(--neutral-dark-gray);
  text-decoration: none;
  transition: all var(--transition-fast);
  border-left: 3px solid transparent;
}

.navbar-dropdown-item:hover {
  background-color: var(--primary-lightest);
  color: var(--primary-dark);
  border-left-color: var(--accent-gold);
  padding-left: calc(var(--spacing-xl) + 4px);
}

/* ============ 右侧动作 ============ */
.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-hotline {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 8px 12px;
  border-radius: var(--radius-full);
  border: 1px dashed var(--primary-light);
  color: var(--primary-dark);
  font-weight: var(--font-weight-semibold);
  background: rgba(30, 64, 175, 0.05);
}

.nav-hotline:hover {
  color: var(--primary-dark);
  border-color: var(--primary-main);
  background: rgba(30, 64, 175, 0.12);
}

.nav-cta {
  box-shadow: var(--shadow-md);
}

/* ============ 汉堡菜单（移动端） ============ */
.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 1px solid var(--neutral-gray);
  border-radius: var(--radius-md);
  cursor: pointer;
  padding: var(--spacing-sm);
}

.navbar-toggle span {
  width: 24px;
  height: 3px;
  background-color: var(--primary-dark);
  border-radius: var(--radius-sm);
  transition: all var(--transition-normal);
}

.navbar-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

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

.navbar-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* ============ 响应式 ============ */
@media (max-width: 1200px) {
  .navbar-menu {
    gap: var(--spacing-md);
  }
  
  .navbar-actions {
    gap: var(--spacing-md);
  }
}

@media (max-width: 1024px) {
  .topbar {
    padding: var(--spacing-sm) var(--spacing-xl);
  }
  
  .navbar-container {
    gap: var(--spacing-lg);
  }
  
  .navbar-actions {
    display: none;
  }
}

@media (max-width: 768px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }
  
  .topbar-left, .topbar-right {
    gap: var(--spacing-sm);
  }
  
  .navbar {
    height: auto;
    padding: var(--spacing-sm) 0;
  }
  
  .navbar-container {
    flex-wrap: wrap;
    align-items: center;
  }
  
  .navbar-toggle {
    display: flex;
  }
  
  .navbar-collapse {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--neutral-white);
    box-shadow: var(--shadow-lg);
    border-top: 1px solid var(--neutral-gray);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal), padding var(--transition-normal);
  }
  
  .navbar-collapse.active {
    padding: var(--spacing-lg);
    max-height: 1200px;
  }
  
  .navbar-menu {
    flex-direction: column;
    width: 100%;
    gap: 0;
  }
  
  .navbar-item {
    width: 100%;
  }
  
  .navbar-link {
    width: 100%;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--neutral-gray);
    border-radius: var(--radius-md);
  }
  
  .navbar-dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background-color: var(--neutral-light-gray);
    padding: 0;
    border: none;
    display: none;
  }
  
  .navbar-item.active .navbar-dropdown {
    display: block;
  }
  
  .navbar-dropdown-item {
    padding: var(--spacing-md) var(--spacing-xl);
    border-left: none;
  }
  
  .navbar-actions {
    display: flex;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding-top: var(--spacing-lg);
  }
  
  .nav-hotline {
    width: 100%;
    justify-content: center;
  }
  
  .nav-cta {
    width: 100%;
    text-align: center;
  }
  
  .navbar-logo-texts small {
    display: none;
  }
}