/* ============================================
   布局与导航栏样式 - 宁海县第一注塑模具有限公司官网
   ============================================ */

@import url('variables.css');

/* ========== 导航栏 ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--color-white);
  box-shadow: var(--shadow-md);
  z-index: var(--z-index-sticky);
  transition: all var(--transition-normal);
}

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

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-xl);
  max-width: 1536px;
  margin: 0 auto;
}

/* 品牌/Logo */
.navbar-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--spacing-md);
  text-decoration: none;
  color: var(--color-primary);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  transition: color var(--transition-fast);
}

.navbar-tagline {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-secondary);
  line-height: 1.2;
}

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

.navbar-brand img {
  height: 40px;
  width: auto;
}

/* 导航菜单 */
.navbar-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
  align-items: center;
}

.navbar-item {
  position: relative;
}

.navbar-link {
  display: block;
  padding: var(--spacing-md) var(--spacing-sm);
  color: var(--color-darker-gray);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-fast);
  position: relative;
}

.navbar-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-fast);
}

.navbar-link:hover::after,
.navbar-link.active::after {
  width: 100%;
}

.navbar-link-highlight {
  border: 1px solid var(--color-accent);
  border-radius: var(--border-radius-full);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-accent);
}

.navbar-link-highlight:hover {
  color: var(--color-white);
  background-color: var(--color-accent);
}

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

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

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

.navbar-submenu-item {
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: var(--border-width-1) solid var(--color-light-gray-2);
}

.navbar-submenu-item:last-child {
  border-bottom: none;
}

.navbar-submenu-link {
  color: var(--color-darker-gray);
  text-decoration: none;
  font-weight: var(--font-weight-normal);
  transition: color var(--transition-fast);
  display: block;
}

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

/* 汉堡菜单按钮 */
.navbar-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  color: var(--color-primary);
  font-size: var(--font-size-xl);
}

/* ========== 响应式导航 ========== */
@media (max-width: 768px) {
  .navbar-container {
    padding: var(--spacing-md);
  }
  
  .navbar-toggle {
    display: block;
  }
  
  .navbar-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background-color: var(--color-white);
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
    box-shadow: var(--shadow-lg);
  }
  
  .navbar-menu.active {
    max-height: 500px;
  }
  
  .navbar-item {
    width: 100%;
    border-bottom: var(--border-width-1) solid var(--color-light-gray-2);
  }
  
  .navbar-link {
    padding: var(--spacing-md) var(--spacing-lg);
    width: 100%;
  }
  
  .navbar-submenu {
    position: static;
    opacity: 0;
    visibility: hidden;
    max-height: 0;
    overflow: hidden;
    transform: none;
    box-shadow: none;
    margin: 0;
    background-color: var(--color-light-gray);
    transition: all var(--transition-normal);
  }
  
  .navbar-item.active .navbar-submenu {
    opacity: 1;
    visibility: visible;
    max-height: 500px;
  }
}

/* ========== 页面容器 ========== */
main {
  margin-top: 80px;
  min-height: calc(100vh - 80px);
}

/* ========== 页眉 ========== */
.page-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: var(--color-white);
  padding: var(--spacing-4xl) var(--spacing-xl);
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.page-header h1 {
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-5xl);
}

.page-header p {
  font-size: var(--font-size-lg);
  opacity: 0.95;
}

@media (max-width: 768px) {
  .page-header {
    padding: var(--spacing-2xl) var(--spacing-md);
  }
  
  .page-header h1 {
    font-size: var(--font-size-3xl);
  }
}

/* ========== 页脚 ========== */
footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-3xl) var(--spacing-xl) var(--spacing-xl);
  margin-top: var(--spacing-4xl);
}

.footer-container {
  max-width: 1536px;
  margin: 0 auto;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-2xl);
  border-bottom: var(--border-width-1) solid rgba(255, 255, 255, 0.1);
}

@media (max-width: 1024px) {
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr;
  }
}

.footer-section h3 {
  color: var(--color-white);
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-lg);
}

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

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

.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--color-white);
  text-decoration: none;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  text-align: center;
  font-size: var(--font-size-sm);
  opacity: 0.8;
}

@media (max-width: 768px) {
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ========== 面包屑导航 ========== */
.breadcrumb {
  display: flex;
  list-style: none;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  padding: var(--spacing-md) 0;
  flex-wrap: wrap;
}

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

.breadcrumb-item::after {
  content: '/';
  margin: 0 var(--spacing-sm);
  color: var(--color-dark-gray);
}

.breadcrumb-item:last-child::after {
  content: '';
  margin: 0;
}

.breadcrumb-link {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.breadcrumb-link:hover {
  color: var(--color-accent-light);
}

.breadcrumb-item.active {
  color: var(--color-dark-gray);
}

/* ========== 侧边栏 ========== */
.sidebar {
  background-color: var(--color-light-gray);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
}

.sidebar h3 {
  margin-bottom: var(--spacing-lg);
  color: var(--color-primary);
}

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

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

.sidebar a {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-darker-gray);
  text-decoration: none;
  border-left: 3px solid transparent;
  transition: all var(--transition-fast);
}

.sidebar a:hover,
.sidebar a.active {
  border-left-color: var(--color-accent);
  color: var(--color-accent);
  padding-left: var(--spacing-lg);
}

/* ========== 分页 ========== */
.pagination {
  display: flex;
  list-style: none;
  gap: var(--spacing-sm);
  justify-content: center;
  margin: var(--spacing-2xl) 0;
  flex-wrap: wrap;
}

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

.pagination-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  border: var(--border-width-1) solid var(--color-medium-gray);
  border-radius: var(--border-radius-md);
  color: var(--color-primary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

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

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

.pagination-item.disabled .pagination-link {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ========== 返回顶部按钮 ========== */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 50px;
  height: 50px;
  background-color: var(--color-accent);
  color: var(--color-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: none;
  justify-content: center;
  align-items: center;
  font-size: var(--font-size-xl);
  transition: all var(--transition-fast);
  z-index: var(--z-index-fixed);
  box-shadow: var(--shadow-lg);
}

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

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

@media (max-width: 768px) {
  .back-to-top {
    width: 45px;
    height: 45px;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
  }
}