a {
            text-decoration: none;
            color: var(--primary);
        }

        a:hover {
            color: var(--secondary);
            text-decoration: none;
        } 
  /* 导航栏样式 */
        header {
            background-color: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        
        .breadcrumb{
            background: unset;
            color: #fff;
            display: flex;
            flex-wrap: wrap;
        }
        .breadcrumb a{
            background: unset;
            color: #fff;
        }
        .logo {
            display: flex;
            align-items: center;
        }
        
        .logo img {
            height: 50px;
            margin-right: 10px;
        }
        
        .logo h1 {
            font-size: 24px;
            color: var(--primary);
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav ul li {
            margin-left: 25px;
        }
        
        nav ul li a {
            text-decoration: none;
            color: var(--dark);
            font-weight: 500;
            transition: color 0.3s;
            padding: 5px 0;
            position: relative;
        }
        
        nav ul li a:hover {
            color: var(--primary);
        }
        
        nav ul li a.active {
            color: var(--primary);
        }
        
        nav ul li a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background-color: var(--primary);
        }
        
        .mobile-menu {
            display: none;
            font-size: 24px;
            color: var(--primary);
        }
         
        :root {
            --primary: #0056b3;
            --secondary: #003d82;
            --accent: #00a8e8;
            --light: #f8f9fa;
            --dark: #343a40;
            --gray: #6c757d;
        }
        
        
           /* 页面标题样式 */
        .page-header {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            padding: 60px 0;
            text-align: center;
         }
        
        .page-header h1 {
            font-size: 36px;
            margin-bottom: 15px;
        }
        
        .contact-breadcrumb {
            display: flex;
            justify-content: center;
            list-style: none;
        }
        
        .contact-breadcrumb li {
            margin: 0 5px;
        }
        
        .contact-breadcrumb li a {
            color: rgba(255,255,255,0.8);
            text-decoration: none;
        }
        
        .contact-breadcrumb li:after {
            content: '>';
            margin-left: 10px;
            color: rgba(255,255,255,0.6);
        }
        
        .contact-breadcrumb li:last-child:after {
            content: '';
        }
        
        .contact-breadcrumb li.active a {
            color: white;
            font-weight: 500;
        }
    /* 一级菜单箭头样式 */
  .custom-nav-link.has-children {
    position: relative;
    padding-right: 25px !important;
  }

  .custom-nav-link.has-children::after {
    content: '';
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid currentColor;
    transition: transform 0.3s ease;
  }

  /* 桌面端：鼠标悬停时箭头向上，显示二级菜单 */
  @media (min-width: 769px) {
    .custom-nav-item:hover .custom-nav-link.has-children::after {
      transform: translateY(-50%) rotate(180deg);
    }
    
    .custom-nav-item:hover > ul {
      opacity: 1;
      visibility: visible;
    }
  }

  /* 移动端：点击展开时的箭头状态 */
  @media (max-width: 768px) {
    .custom-nav-link.has-children {
      padding-right: 40px !important;
    }
    
    .custom-nav-link.has-children::after {
      right: 20px;
    }
    
    /* 移动端二级菜单默认隐藏 */
    .custom-nav-item > ul {
      max-height: 0;
      overflow: hidden;
      opacity: 0;
      visibility: hidden;
      transition: all 0.3s ease;
    }
    
    /* 移动端展开状态 */
    .custom-nav-item.active > ul {
      max-height: 500px;
      opacity: 1;
      visibility: visible;
    }
    
    .custom-nav-item.active .custom-nav-link.has-children::after {
      transform: translateY(-50%) rotate(180deg);
    }
  }
   
   /**新版的*/
   /* 导航的基础样式 */
.custom-navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 80px;
    display: flex;
    width: 100%;
    margin: 0 auto;
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    padding: 0;
}

.custom-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
}

.custom-navbar-brand img {
    height: 40px;
    display: block;
}

/* 导航菜单 - 桌面端 */
.custom-nav {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    justify-content: flex-end; /* 菜单项靠右对齐 */
    width: 100%;
}

.custom-nav-item {
    margin-left: 30px; /* 增加菜单项间距 */
}

.custom-nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    padding: 12px 16px; /* 增加内边距 */
    border-radius: 4px;
    transition: all 0.2s;
    display: block;
    font-size: 16px;
}

.custom-nav-link:hover {
    color: #0066cc;
    background-color: rgba(0, 102, 204, 0.1);
}

.custom-nav-link.active {
    color: #0066cc;
    font-weight: 600;
    background-color: rgba(0, 102, 204, 0.05);
}

/* 汉堡菜单按钮 */
.custom-navbar-toggler {
    display: none;
    width: 30px;
    height: 24px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    position: relative;
    z-index: 1001;
}

.custom-navbar-toggler .line {
    position: absolute;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: #333;
    transition: all 0.3s ease;
}

.custom-navbar-toggler .line1 {
    top: 0;
}

.custom-navbar-toggler .line2 {
    top: 50%;
    transform: translateY(-50%);
}

.custom-navbar-toggler .line3 {
    bottom: 0;
}

.custom-navbar-toggler.active .line1 {
    transform: translateY(9px) rotate(45deg);
}

.custom-navbar-toggler.active .line2 {
    opacity: 0;
}

.custom-navbar-toggler.active .line3 {
    transform: translateY(-9px) rotate(-45deg);
}

/* 移动端样式 */
@media (max-width: 768px) {
    .custom-navbar-toggler {
        display: block;
    }
    
    .custom-navbar-menu {
        position: absolute;
        top: 100%;
        right: 0;
        width: 70%;
        background-color: #fff;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease-out;
    }
    
    .custom-navbar-menu.show {
        max-height: 500px;
    }
    
    .custom-nav {
        flex-direction: column;
        padding: 10px 0;
        justify-content: flex-start;
    }
    
    .custom-nav-item {
        margin: 0;
        width: 100%;
        text-align: left;
    }
    
    .custom-nav-link {
        padding: 15px 20px;
        border-bottom: 1px solid #f5f5f5;
        text-align: left;
    }
    
    .custom-nav-item:last-child .custom-nav-link {
        border-bottom: none;
    }
}

/* 桌面端大屏幕优化 */
@media (min-width: 1200px) {
    .custom-container {
        max-width: 1200px;
        margin: 0 auto;
    }
    
    .custom-nav {
        justify-content: flex-end;
        width: auto;
    }
}

/* 为body添加padding-top以避免内容被导航栏遮挡 */
body {
    padding-top: 70px;
}

/* 确保导航栏内容在桌面端正确分布 */
@media (min-width: 769px) {
    .custom-container {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    
    .custom-navbar-menu {
        display: block !important;
        width: auto;
    }
    
    .custom-nav {
        justify-content: flex-end;
        width: 100%;
    }
}
   /* 二级菜单容器样式 */
.custom-nav-item {
    position: relative; /* 为子菜单定位提供参考 */
}

/* 二级菜单列表样式 */
.custom-nav-item > ul {
    position: absolute;
    top: 100%;
    left: 0;
    width: 200px;
    background-color: #fff;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    border-radius: 4px;
    list-style: none;
    padding: 10px 0;
    margin: 0;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 100;
    display: flex;
    flex-direction: column;
}

/* 二级菜单项样式 */
.custom-nav-item > ul li {
    padding: 0;
    margin: 0;
}

.custom-nav-item > ul li a {
    display: block;
    padding: 8px 20px;
    color: #333;
    text-decoration: none;
    transition: all 0.2s;
    font-size: 14px;
}

.custom-nav-item > ul li a:hover {
    background-color: rgba(0, 102, 204, 0.1);
    color: #0066cc;
}

/* 鼠标悬停或点击时显示二级菜单 */
.custom-nav-item:hover > ul,
.custom-nav-item:focus-within > ul {
    opacity: 1;
    visibility: visible;
}

/* 移动端样式调整 */
@media (max-width: 768px) {
    .custom-nav-item > ul {
        position: static;
        width: 100%;
        box-shadow: none;
        opacity: 1; /* 默认显示 */
        visibility: visible; /* 默认显示 */
        max-height: none; /* 移除高度限制 */
        overflow: visible; /* 取消溢出隐藏 */
        margin-left: 30px; /* 向右缩进30px */
        padding: 0; /* 重置内边距 */
        background-color: transparent; /* 透明背景 */
    }
    
    .custom-nav-item > ul li a {
        padding: 10px 30px;
        border-bottom: 1px solid #f5f5f5;
    }
    
    /* 移除active状态的影响 */
    .custom-nav-item.active > ul {
        max-height: none;
    }
}

/* 移动端：二级菜单默认隐藏 */
  @media (max-width: 768px) {
    .custom-nav-item > ul {
      max-height: 0;
      overflow: hidden;
      opacity: 0;
      visibility: hidden;
      transition: all 0.3s ease;
    }
    
    /* 移动端展开状态 */
    .custom-nav-item.active > ul {
      max-height: 500px;
      opacity: 1;
      visibility: visible;
    }
    
    .custom-nav-item.active .custom-nav-link.has-children::after {
      transform: translateY(-50%) rotate(180deg);
    }
  }