/* 
 * 广州市番大弹簧有限公司官网 - 导航与页眉样式（精简版）
 */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-fixed);
  pointer-events: auto;
  display: block;
}

.utility-bar {
  background: linear-gradient(120deg, var(--color-primary-dark), var(--color-primary));
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--font-size-sm);
}

.utility-inner {
  max-width: var(--container-2xl);
  margin: 0 auto;
  padding: var(--spacing-2) var(--spacing-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-4);
}

.utility-left,
.utility-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
  flex-wrap: wrap;
}

.utility-item {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
}

.utility-item a {
  color: inherit;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.utility-item a:hover {
  opacity: 0.8;
}

.utility-item strong {
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.08em;
}

.utility-divider {
  width: 1px;
  height: 22px;
  background: rgba(255, 255, 255, 0.25);
}

.utility-link {
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
  font-size: var(--font-size-xs);
  transition: opacity var(--transition-fast);
}

.utility-link:hover {
  opacity: 0.85;
}

.navbar {
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(17, 24, 39, 0.06);
  transition: box-shadow var(--transition-base), border-color var(--transition-base), background var(--transition-base);
}

.navbar.scrolled {
  background: var(--color-white);
  box-shadow: 0 18px 30px -24px rgba(15, 61, 107, 0.45);
  border-bottom-color: transparent;
}

.navbar-container {
  max-width: var(--container-2xl);
  margin: 0 auto;
  padding: var(--spacing-4) var(--spacing-6);
  display: flex;
  align-items: center;
  gap: var(--spacing-6);
}

.navbar-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-3);
  text-decoration: none;
}

.brand-mark {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

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

.brand-name {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  letter-spacing: 0.04em;
}

.brand-slogan {
  font-size: var(--font-size-xs);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-primary-light);
}

.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  background: var(--color-white);
  cursor: pointer;
  transition: box-shadow var(--transition-fast);
}

.navbar-toggle:hover {
  box-shadow: var(--shadow-sm);
}

.navbar-toggle-bar {
  width: 22px;
  height: 3px;
  border-radius: var(--radius-full);
  background-color: var(--color-text-primary);
  transition: all var(--transition-base);
}

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

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

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

.navbar-menu {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-6);
}

.navbar-links {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
}

.navbar-item {
  position: relative;
}

.navbar-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-1);
  padding: var(--spacing-3) var(--spacing-4);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.navbar-link::after {
  content: '';
  position: absolute;
  left: var(--spacing-4);
  right: var(--spacing-4);
  bottom: 10px;
  height: 2px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  opacity: 0;
  transform: translateY(6px);
  transition: all var(--transition-fast);
}

.navbar-link:hover {
  color: var(--color-primary);
  background-color: rgba(26, 84, 144, 0.08);
}

.navbar-link:hover::after,
.navbar-link.active::after {
  opacity: 1;
  transform: translateY(0);
}

.navbar-link.active {
  color: var(--color-primary);
  background-color: rgba(26, 84, 144, 0.08);
}

.navbar-dropdown {
  position: absolute;
  top: calc(100% + 14px);
  left: 0;
  min-width: 220px;
  padding: var(--spacing-2);
  border-radius: var(--radius-2xl);
  background-color: var(--color-white);
  border: 1px solid rgba(17, 24, 39, 0.06);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-12px);
  transition: all var(--transition-base);
  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-3) var(--spacing-4);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.navbar-dropdown-item:hover,
.navbar-dropdown-item.active {
  color: var(--color-primary);
  background-color: rgba(26, 84, 144, 0.08);
  transform: translateX(4px);
}

.navbar-actions {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-4);
}

.navbar-hotline {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--color-text-primary);
}

.navbar-hotline span {
  letter-spacing: 0.06em;
}

.hotline-label {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  text-transform: uppercase;
}

.hotline-number {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
}

.navbar-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding-inline: var(--spacing-5);
  box-shadow: var(--shadow-sm);
}

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

@media (max-width: 1280px) {
  .navbar-menu {
    gap: var(--spacing-4);
  }
  
  .navbar-actions {
    gap: var(--spacing-3);
  }
}

@media (max-width: 1024px) {
  .utility-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-2);
  }
  
  .navbar-container {
    padding: var(--spacing-3) var(--spacing-4);
  }
  
  .navbar-toggle {
    display: inline-flex;
    margin-left: auto;
  }
  
  .navbar-menu {
    position: fixed;
    top: 120px;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(14px);
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-5);
    padding: var(--spacing-6) var(--spacing-4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-xl);
  }
  
  .navbar-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  
  .navbar-links {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-2);
  }
  
  .navbar-item {
    width: 100%;
  }
  
  .navbar-link {
    justify-content: space-between;
    width: 100%;
  }
  
  .navbar-dropdown {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    border: none;
    box-shadow: none;
    background-color: var(--color-gray-50);
    margin-top: var(--spacing-2);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
  }
  
  .navbar-item.active .navbar-dropdown {
    max-height: 500px;
  }
  
  .navbar-actions {
    flex-direction: column;
    align-items: stretch;
    gap: var(--spacing-3);
  }
  
  .navbar-hotline {
    align-items: center;
  }
  
  .navbar-cta {
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .utility-inner {
    padding: var(--spacing-2) var(--spacing-4);
  }
  
  .utility-left,
  .utility-right {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-2);
  }
  
  .utility-divider {
    display: none;
  }
  
  .brand-mark {
    width: 42px;
    height: 42px;
    font-size: var(--font-size-base);
  }
  
  .brand-name {
    font-size: var(--font-size-base);
  }
  
  .brand-slogan {
    letter-spacing: 0.18em;
  }
  
  .navbar-menu {
    top: 112px;
  }
}