/* ============================================
   导航栏和二级菜单样式
   ============================================ */

/* 1. 导航栏容器 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 70px;
  background-color: var(--color-white);
  box-shadow: var(--shadow-md);
  z-index: var(--z-index-fixed);
  transition: all var(--transition-base);
}

.navbar.scrolled {
  height: 60px;
  box-shadow: var(--shadow-lg);
}

/* 2. 导航栏内容 */
.navbar-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 var(--spacing-6);
  max-width: 1400px;
  margin: 0 auto;
}

/* 3. Logo */
.navbar-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  text-decoration: none;
  color: var(--color-primary);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  transition: color var(--transition-fast);
  flex-shrink: 0;
}

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

.navbar-logo img {
  height: 50px;
  width: auto;
}

.navbar-logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.navbar-logo-main {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
}

.navbar-logo-sub {
  font-size: var(--font-size-xs);
  color: var(--color-secondary);
  font-weight: var(--font-weight-normal);
}

/* 4. 导航菜单 */
.navbar-nav {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1;
  justify-content: center;
}

.navbar-nav-item {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
}

.navbar-nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-1);
  padding: 0 var(--spacing-5);
  height: 100%;
  color: var(--color-text-dark);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-fast);
  position: relative;
  white-space: nowrap;
}

.navbar-nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 3px;
  background-color: var(--color-primary);
  transform: translateX(-50%);
  transition: width var(--transition-fast);
}

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

.navbar-nav-item:hover > .navbar-nav-link::after {
  width: 100%;
}

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

.navbar-nav-item.active > .navbar-nav-link::after {
  width: 100%;
}

/* 5. 下拉菜单指示器 */
.navbar-nav-arrow {
  font-size: var(--font-size-xs);
  transition: transform var(--transition-fast);
}

.navbar-nav-item:hover > .navbar-nav-link .navbar-nav-arrow {
  transform: rotate(180deg);
}

/* 6. 二级菜单 */
.navbar-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-white);
  border-top: 3px solid var(--color-primary);
  box-shadow: var(--shadow-lg);
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  z-index: var(--z-index-dropdown);
  list-style: none;
  margin: 0;
  padding: var(--spacing-3) 0;
}

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

.navbar-dropdown-item {
  display: block;
}

.navbar-dropdown-link {
  display: block;
  padding: var(--spacing-3) var(--spacing-6);
  color: var(--color-text-dark);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  transition: all var(--transition-fast);
  border-left: 3px solid transparent;
}

.navbar-dropdown-link:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  padding-left: calc(var(--spacing-6) + 3px);
}

/* 7. 右侧工具栏 */
.navbar-tools {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
  flex-shrink: 0;
}

.navbar-search {
  position: relative;
  display: none;
}

.navbar-search input {
  width: 200px;
  padding: var(--spacing-2) var(--spacing-4);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.navbar-search input:focus {
  outline: none;
  border-color: var(--color-primary);
  width: 250px;
  box-shadow: var(--shadow-primary-sm);
}

.navbar-search button {
  position: absolute;
  right: 5px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--color-primary);
  cursor: pointer;
  padding: var(--spacing-2);
  font-size: var(--font-size-base);
}

.navbar-phone {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
}

.navbar-phone-icon {
  font-size: var(--font-size-lg);
}

.navbar-cta {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-2) var(--spacing-5);
  border-radius: var(--border-radius-md);
  font-weight: var(--font-weight-semibold);
  transition: all var(--transition-fast);
  white-space: nowrap;
  border: none;
  cursor: pointer;
  font-size: var(--font-size-base);
}

.navbar-cta:hover {
  background-color: var(--color-primary-light);
  box-shadow: var(--shadow-primary-md);
  transform: translateY(-2px);
}

/* 8. 汉堡菜单（移动端） */
.navbar-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-dark);
  font-size: var(--font-size-xl);
  cursor: pointer;
  padding: var(--spacing-2);
  transition: color var(--transition-fast);
}

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

/* 9. 响应式设计 */
@media (max-width: 1024px) {
  .navbar-content {
    padding: 0 var(--spacing-4);
  }

  .navbar-nav {
    gap: 0;
  }

  .navbar-nav-link {
    padding: 0 var(--spacing-3);
  }

  .navbar-search {
    display: none !important;
  }

  .navbar-phone {
    display: none;
  }
}

@media (max-width: 768px) {
  .navbar {
    height: 60px;
  }

  .navbar.scrolled {
    height: 60px;
  }

  .navbar-content {
    padding: 0 var(--spacing-4);
  }

  .navbar-logo img {
    height: 40px;
  }

  .navbar-logo-text {
    display: none;
  }

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

  .navbar-nav {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    justify-content: flex-start;
    gap: 0;
    background-color: var(--color-white);
    padding-top: var(--spacing-4);
    max-height: calc(100vh - 60px);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-100%);
    transition: all var(--transition-base);
    z-index: var(--z-index-fixed) - 1;
  }

  .navbar.mobile-open .navbar-nav {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
  }

  .navbar-nav-item {
    width: 100%;
    height: auto;
    border-bottom: 1px solid var(--color-border);
  }

  .navbar-nav-link {
    padding: var(--spacing-4) var(--spacing-4);
    height: auto;
    justify-content: space-between;
  }

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

  .navbar-nav-item:hover > .navbar-nav-link {
    background-color: var(--color-bg-secondary);
  }

  .navbar-dropdown {
    position: static;
    opacity: 0;
    visibility: hidden;
    max-height: 0;
    overflow: hidden;
    border-top: none;
    border-left: 3px solid var(--color-primary);
    box-shadow: none;
    transform: none;
    transition: all var(--transition-fast);
    background-color: var(--color-bg-secondary);
  }

  .navbar-nav-item.open > .navbar-dropdown {
    opacity: 1;
    visibility: visible;
    max-height: 500px;
  }

  .navbar-dropdown-link {
    padding: var(--spacing-3) var(--spacing-4) var(--spacing-3) var(--spacing-8);
  }

  .navbar-dropdown-link:hover {
    padding-left: calc(var(--spacing-8) + 3px);
  }

  .navbar-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .navbar-tools {
    gap: var(--spacing-2);
  }

  .navbar-cta {
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
  }
}

@media (max-width: 480px) {
  .navbar {
    height: 56px;
  }

  .navbar-content {
    padding: 0 var(--spacing-3);
  }

  .navbar-logo {
    gap: 0;
  }

  .navbar-logo-main {
    font-size: var(--font-size-sm);
  }

  .navbar-nav {
    top: 56px;
  }

  .navbar-phone-icon {
    display: none;
  }

  .navbar-cta {
    display: none;
  }
}