/**
 * 导航栏样式
 * 包含顶部栏、主导航栏、移动端菜单
 */

/* ========== 站点头部 ========== */
.site-header {
  background: var(--color-bg-primary);
  box-shadow: var(--shadow-md);
  position: sticky;
  top: 0;
  z-index: 1000;
}

/* ========== 顶部联系信息栏 ========== */
.top-bar {
  background: linear-gradient(135deg, var(--color-primary-700) 0%, var(--color-primary-800) 100%);
  color: var(--color-text-inverse);
  padding: 0.5rem 0;
  font-size: var(--text-sm);
}

.top-bar-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-contact-info {
  display: flex;
  gap: var(--spacing-lg);
}

.top-contact-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.top-contact-item a {
  color: var(--color-text-inverse);
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.top-contact-item a:hover {
  opacity: 0.8;
}

.top-contact-item i {
  opacity: 0.9;
}

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

.top-social-link {
  color: var(--color-text-inverse);
  transition: all var(--transition-fast);
  opacity: 0.8;
}

.top-social-link:hover {
  opacity: 1;
  transform: translateY(-2px);
}

/* ========== 主导航栏 ========== */
.main-header {
  background: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
  position: relative;
}

/* ========== Logo 样式 ========== */
.navbar-brand a {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  text-decoration: none;
}

.logo-img-container {
  width: 140px !important;
  height: 40px !important;
  max-width: 140px !important;
  max-height: 40px !important;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
}

.logo-img {
  max-width: 100% !important;
  max-height: 100% !important;
  width: auto !important;
  height: auto !important;
  object-fit: contain;
  display: block;
}

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

.logo-title {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  line-height: 1.2;
}

.logo-subtitle {
  font-size: 11px;
  color: var(--color-text-tertiary);
  font-weight: var(--font-normal);
}

/* ========== 导航菜单 ========== */
.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-xs);
  align-items: center;
  flex: 1;
  justify-content: flex-end;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: var(--font-medium);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  white-space: nowrap;
  font-size: var(--text-sm);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary-600);
  background: var(--color-primary-50);
}

.nav-link i {
  font-size: var(--text-base);
}

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

.dropdown-arrow {
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  margin-left: 2px;
  transition: transform var(--transition-fast);
}

.has-dropdown:hover .dropdown-arrow {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-sm) 0;
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-base);
  z-index: 100;
}

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

.dropdown-menu li a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.dropdown-menu li a:hover {
  background: var(--color-primary-50);
  color: var(--color-primary-600);
}

/* ========== CTA 导航按钮 ========== */
.nav-cta .nav-link {
  background: linear-gradient(135deg, var(--color-accent-500) 0%, var(--color-accent-400) 100%);
  color: var(--color-text-inverse);
  padding: var(--spacing-xs) var(--spacing-md);
  box-shadow: 0 2px 8px rgba(249, 115, 22, 0.3);
  font-size: var(--text-xs);
}

.nav-cta .nav-link:hover {
  background: linear-gradient(135deg, var(--color-accent-600) 0%, var(--color-accent-500) 100%);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(249, 115, 22, 0.4);
  color: var(--color-text-inverse);
}

/* ========== 移动端菜单按钮 ========== */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.mobile-menu-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

/* ========== 响应式设计 ========== */
@media (max-width: 768px) {
  /* 顶部栏响应式 */
  .top-bar-content {
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }

  .top-contact-info {
    flex-direction: column;
    gap: var(--spacing-xs);
    font-size: var(--text-xs);
  }

  .top-social-links {
    display: none;
  }

  /* Logo 响应式 */
  .logo-img-container {
    width: 140px;
    height: 40px;
  }

  .logo-title {
    font-size: var(--text-lg);
  }

  .logo-subtitle {
    display: none;
  }

  /* 移动端菜单 */
  .mobile-menu-toggle {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg-primary);
    border-top: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-md);
    gap: 0;
    display: none;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
  }

  .nav-menu.active {
    display: flex;
    max-height: 500px;
    overflow-y: auto;
  }

  .nav-item {
    width: 100%;
  }

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

  /* 下拉菜单移动端 */
  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    border-left: 2px solid var(--color-primary-300);
    margin-left: var(--spacing-lg);
    padding-left: var(--spacing-md);
    display: none;
  }

  .has-dropdown.active .dropdown-menu {
    display: block;
  }

  .dropdown-arrow {
    display: none;
  }
}

@media (max-width: 480px) {
  .logo-img-container {
    width: 120px;
    height: 36px;
  }

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