/* ============================================
   飞龙家用电器官网 - 布局样式
   ============================================ */

@import url('variables.css');

/* ========== 导航栏 ========== */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  min-height: 88px;
  padding: var(--spacing-sm) 0;
  background-color: var(--color-background-white);
  box-shadow: var(--box-shadow-sm);
  z-index: var(--z-fixed);
  transition: all var(--transition-base);
}

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

.navbar-container {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  height: 100%;
  padding: 0 var(--spacing-sm);
  max-width: none;
  margin: 0;
  width: 100%;
  gap: var(--spacing-lg);
}

.navbar-logo {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--spacing-xs);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  text-decoration: none;
  line-height: 1.1;
  white-space: normal;
}

.navbar-brand-name {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary-dark);
  white-space: nowrap;
}

.navbar-brand-tagline {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-gray);
  letter-spacing: 0.02em;
}

.navbar-logo img {
  height: 50px;
  width: auto;
  margin-right: var(--spacing-md);
}

.navbar-menu {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--spacing-lg);
  flex: 1;
  margin-left: var(--spacing-lg);
}

.navbar-item {
  position: relative;
}

.navbar-link {
  display: flex;
  align-items: center;
  padding: var(--spacing-md) 0;
  color: var(--color-text-dark);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
  white-space: nowrap;
}

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

.navbar-link.active {
  color: var(--color-primary);
  border-bottom: 3px solid var(--color-primary);
}

/* ========== 下拉菜单 ========== */

.dropdown {
  position: relative;
}

.dropdown-toggle::after {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  margin-left: var(--spacing-sm);
  vertical-align: 0.255em;
  border-top: 0.3em solid;
  border-right: 0.3em solid transparent;
  border-bottom: 0;
  border-left: 0.3em solid transparent;
  transition: transform var(--transition-fast);
}

.dropdown:hover .dropdown-toggle::after {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background-color: var(--color-background-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--border-radius-md);
  box-shadow: var(--box-shadow-lg);
  list-style: none;
  margin: var(--spacing-sm) 0 0 0;
  padding: var(--spacing-sm) 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  z-index: var(--z-dropdown);
}

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

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

.dropdown-item:hover {
  background-color: var(--color-background-light);
  color: var(--color-primary);
  padding-left: var(--spacing-xl);
}

.dropdown-divider {
  height: 1px;
  background-color: var(--color-border-light);
  margin: var(--spacing-sm) 0;
}

/* ========== 搜索框 ========== */

.navbar-search {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-left: auto;
}

.search-input {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  width: 200px;
  transition: all var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 86, 179, 0.1);
}

.search-btn {
  background: none;
  border: none;
  color: var(--color-primary);
  cursor: pointer;
  font-size: var(--font-size-lg);
  transition: color var(--transition-fast);
}

.search-btn:hover {
  color: var(--color-primary-light);
}

/* ========== 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;
  transition: color var(--transition-fast);
}

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

/* ========== 页面容器 ========== */

.page-wrapper {
  margin-top: 104px;
  min-height: calc(100vh - 104px);
  display: flex;
  flex-direction: column;
}

.page-content {
  flex: 1;
}

/* ========== 页脚 ========== */

footer {
  background-color: var(--color-background-dark);
  color: var(--color-text-white);
  padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-lg);
  margin-top: var(--spacing-3xl);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

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

.footer-column ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-column li {
  margin-bottom: var(--spacing-md);
}

.footer-column a {
  color: var(--color-text-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-column a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  border-top: 1px solid var(--color-border-dark);
  padding-top: var(--spacing-lg);
  text-align: center;
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

.footer-bottom p {
  margin-bottom: var(--spacing-sm);
}

/* ========== 面包屑导航 ========== */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  padding: var(--spacing-md) 0;
  margin-bottom: var(--spacing-lg);
  list-style: none;
  background-color: transparent;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
  display: inline-block;
  padding: 0 var(--spacing-sm);
  color: var(--color-text-light);
  content: '/';
}

.breadcrumb-item a {
  color: var(--color-primary);
}

.breadcrumb-item.active {
  color: var(--color-text-light);
}

/* ========== 侧边栏 ========== */

.sidebar {
  background-color: var(--color-background-light);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.sidebar-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--color-primary);
}

.sidebar-item {
  margin-bottom: var(--spacing-md);
}

.sidebar-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text-dark);
  text-decoration: none;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
}

.sidebar-link:hover,
.sidebar-link.active {
  background-color: var(--color-primary);
  color: var(--color-text-white);
  padding-left: var(--spacing-lg);
}

/* ========== 分页 ========== */

.pagination {
  display: flex;
  justify-content: center;
  list-style: none;
  padding: 0;
  margin: var(--spacing-xl) 0;
  gap: var(--spacing-sm);
}

.pagination-item {
  display: inline-block;
}

.pagination-link {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--spacing-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  color: var(--color-text-dark);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.pagination-link:hover {
  background-color: var(--color-primary);
  color: var(--color-text-white);
  border-color: var(--color-primary);
}

.pagination-link.active {
  background-color: var(--color-primary);
  color: var(--color-text-white);
  border-color: var(--color-primary);
}

.pagination-link.disabled {
  color: var(--color-text-light);
  cursor: not-allowed;
  opacity: 0.5;
}

/* ========== 返回顶部按钮 ========== */

.back-to-top {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 50px;
  height: 50px;
  background-color: var(--color-primary);
  color: var(--color-text-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: none;
  justify-content: center;
  align-items: center;
  font-size: var(--font-size-lg);
  transition: all var(--transition-fast);
  z-index: var(--z-fixed);
}

.back-to-top:hover {
  background-color: var(--color-primary-light);
  transform: translateY(-3px);
  box-shadow: var(--box-shadow-lg);
}

.back-to-top.show {
  display: flex;
}

/* ========== 响应式布局 ========== */

/* 平板设备 */
@media (max-width: 991px) {
  .navbar-menu {
    gap: var(--spacing-md);
    margin-left: var(--spacing-lg);
  }
  
  .navbar-link {
    padding: var(--spacing-md) var(--spacing-sm);
  }
  
  .search-input {
    width: 150px;
  }
  
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 手机设备 */
@media (max-width: 767px) {
  .navbar {
    min-height: 60px;
    padding: 0;
  }
  
  .navbar-container {
    padding: 0 var(--spacing-md);
    justify-content: space-between;
    gap: var(--spacing-md);
    max-width: none;
    margin: 0;
  }
  
  .navbar-logo {
    font-size: var(--font-size-lg);
  }
  
  .navbar-brand-tagline {
    display: none;
  }
  
  .navbar-logo img {
    height: 40px;
  }
  
  .navbar-toggle {
    display: block;
  }
  
  .navbar-menu {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    margin-left: 0;
    flex-direction: column;
    background-color: var(--color-background-white);
    border-bottom: 1px solid var(--color-border-light);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
    gap: 0;
  }
  
  .navbar-menu.active {
    max-height: 500px;
  }
  
  .navbar-item {
    width: 100%;
    border-bottom: 1px solid var(--color-border-light);
  }
  
  .navbar-link {
    padding: var(--spacing-md) var(--spacing-lg);
    width: 100%;
  }
  
  .navbar-search {
    display: none;
  }
  
  .dropdown-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    background-color: var(--color-background-light);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
  }
  
  .dropdown.active .dropdown-menu {
    max-height: 500px;
  }
  
  .dropdown-item {
    padding-left: var(--spacing-2xl);
  }
  
  .page-wrapper {
    margin-top: 60px;
    min-height: calc(100vh - 60px);
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .back-to-top {
    width: 45px;
    height: 45px;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
  }
}

/* 超小屏幕 */
@media (max-width: 480px) {
  .navbar-container {
    padding: 0 var(--spacing-sm);
  }
  
  .navbar-logo {
    font-size: var(--font-size-base);
  }
  
  .navbar-logo img {
    height: 35px;
  }
}