/* ===== CSS重置与基础样式 ===== */
 * {
     margin: 0;
     padding: 0;
     box-sizing: border-box;
 }

 :root {
     --primary-color: #002965;
     --secondary-color: #004890;
     --accent-color: #00307f;
     --text-color: #333;
     --light-bg: #f5f7fa;
     --white: #ffffff;
     --shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
     --transition: all 0.3s ease;
 }

 body {
     /*background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);*/
     color: var(--text-color);
     min-height: 100vh;
     display: flex;
     flex-direction: column;
     line-height: 1.6;
 }

 .container {
     max-width: 100%;
     overflow-x: hidden;
     flex: 1 0 auto;
 }

 .header-section {
     background: #000000;
     padding: 10px;
     color: #fff3e7;
     display: none;
     /* 默认隐藏顶部横幅 */
 }

 .header-section div {
     display: flex;
     justify-content: space-around;
     font-size: 1.2rem;
     font-weight: bold;
     text-transform: uppercase;
     flex-wrap: wrap;
 }

 .header-logo {
     display: flex;
     justify-content: space-between;
     padding: 10px 20px;
     align-items: center;
     flex-wrap: wrap;
 }

 .header-logo img {
     width: 180px;
     height: auto;
     max-height: 70px;
     cursor: pointer;
 }

 .header-logo div {
     margin-top: 5px;
     text-align: right;
 }

 .header-logo p {
     line-height: 1.3;
     margin-bottom: 0px;
     font-size: 1rem;
     color: #1a1a1a;
     font-weight: bold;
 }

 header {
     background-color: #002965;
     box-shadow: 0 6px 15px rgba(0, 0, 0, 0.2);
     margin-bottom: 20px;
 }

 .desktop-nav {
     display: flex;
     justify-content: space-between;
     align-items: center;
     padding: 0 10px;
 }

 .nav-links {
     display: flex;
     list-style: none;
     margin: 0 auto;
     flex-wrap: wrap;
     justify-content: center;
 }

 .nav-item {
     position: relative;
 }

 .nav-link {
     color: var(--white);
     text-decoration: none;
     padding: 15px 12px;
     display: block;
     font-size: 14px;
     transition: var(--transition);
     white-space: nowrap;
     text-transform: uppercase;
 }

 .nav-link:hover {
     background-color: var(--secondary-color);
 }

 /* ===== 下拉菜单样式 ===== */
 .dropdown {
     position: absolute;
     top: 100%;
     left: 0;
     background-color: #ffffff;
     white-space: nowrap;
     border-radius: 0 0 4px 4px;
     display: none;
     z-index: 1000;
     overflow: hidden;
     border-left: #00276a 2px solid;
     border-right: #00276a 2px solid;
     border-bottom: #00276a 2px solid;
     box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
 }

 .nav-item:nth-child(3):hover .dropdown {
     min-width: 620px;
     display: grid;
     grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
     gap: 0;
     animation: fadeIn 0.3s ease;
 }

 .nav-item:hover .dropdown {
     display: block;
     animation: fadeIn 0.3s ease;
 }



 @keyframes fadeIn {
     from {
         opacity: 0;
         transform: translateY(-10px);
     }

     to {
         opacity: 1;
         transform: translateY(0);
     }
 }

 .dropdown-item {
     display: block;
     padding: 12px 15px;
     text-decoration: none;
     color: var(--text-color);
     transition: var(--transition);
     font-size: 14px;
 }

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

 .dropdown-item:hover {
     background-color: #23265b;
     color: var(--white);
     padding-left: 20px;
 }

 .dropdown-header {
     font-weight: bold;
     padding: 12px 15px;
     text-transform: uppercase;
 }

 .dropdown-header a {
     display: block;
     text-decoration: none;
     font-weight: bold;
     color: #002865;
     font-size: 14px;
 }

 .dropdown-header:hover {
     background-color: #23265b;
     color: #FFF;
     padding-left: 20px;
 }

 .dropdown-header:hover a {
     color: #FFF;
 }


 /* ===== 移动端导航样式 ===== */
 .mobile-breadcrumb {
     display: none;
     padding: 12px 15px;
     background-color: var(--primary-color);
     color: var(--white);
     margin-bottom: 0;
     cursor: pointer;
     justify-content: space-between;
     align-items: center;
     transition: var(--transition);
 }

 .mobile-breadcrumb:hover {
     background-color: var(--secondary-color);
 }

 .mobile-breadcrumb span {
     font-weight: bold;
     font-size: 16px;
 }

 .mobile-sidebar {
     position: fixed;
     top: 0;
     right: -300px;
     width: 280px;
     height: 100%;
     background-color: var(--white);
     box-shadow: -5px 0 15px rgba(0, 0, 0, 0.2);
     z-index: 1001;
     transition: right 0.3s ease;
     overflow-y: auto;
 }

 .mobile-sidebar.active {
     right: 0;
 }

 .sidebar-header {
     padding: 15px 20px;
     background-color: var(--primary-color);
     color: var(--white);
     display: flex;
     justify-content: space-between;
     align-items: center;
 }

 .close-sidebar {
     background: none;
     border: none;
     color: var(--white);
     font-size: 24px;
     cursor: pointer;
     transition: var(--transition);
 }

 .close-sidebar:hover {
     transform: scale(1.2);
 }

 .mobile-menu {
     list-style: none;
     padding: 0;
 }

 .mobile-menu-item {
     border-bottom: 1px solid #eee;
 }

 .mobile-menu-link {
     display: block;
     padding: 15px 20px;
     color: var(--text-color);
     text-decoration: none;
     font-weight: bold;
     position: relative;
     font-size: 16px;
     transition: var(--transition);
 }

 .mobile-menu-link:hover {
     background-color: #f5f5f5;
 }

 .mobile-menu-link.has-children::after {
     content: '>';
     position: absolute;
     right: 20px;
     transform: rotate(90deg);
 }

 .mobile-submenu {
     display: none;
     background-color: #f8f9fa;
     padding: 10px 0;
 }

 .mobile-submenu.active {
     display: block;
     animation: slideDown 0.3s ease;
 }

 @keyframes slideDown {
     from {
         opacity: 0;
         max-height: 0;
     }

     to {
         opacity: 1;
         max-height: 500px;
     }
 }

 .mobile-submenu-item {
     padding: 12px 20px 12px 40px;
     display: block;
     color: #555;
     text-decoration: none;
     border-bottom: 1px solid #eee;
     font-size: 14px;
     transition: var(--transition);
 }

 .mobile-submenu-item:hover {
     background-color: #e9ecef;
     padding-left: 45px;
 }

 .mobile-submenu-header {
     padding: 12px 20px 12px 30px;
     font-weight: bold;
     color: var(--primary-color);
     background-color: #e9ecef;
     border-bottom: 1px solid #ddd;
     font-size: 14px;
 }

 .overlay {
     position: fixed;
     top: 0;
     left: 0;
     width: 100%;
     height: 100%;
     background-color: rgba(0, 0, 0, 0.5);
     z-index: 1000;
     display: none;
     transition: opacity 0.3s ease;
 }

 .overlay.active {
     display: block;
     animation: fadeInOverlay 0.3s ease;
 }

 @keyframes fadeInOverlay {
     from {
         opacity: 0;
     }

     to {
         opacity: 1;
     }
 }

 .site-breadcumb {
     margin-bottom: 20px;
     font-size: 14px;
 }

 .site-breadcumb a {
     color: #002965;
     text-decoration: none;
     transition: color 0.2s ease;
     font-weight: bold;
 }

 .site-breadcumb a:hover {
     color: #004890;
 }

 /* ===== 底部样式 ===== */
 footer {
     background-color: var(--primary-color);
     color: var(--white);
     padding: 30px 0 10px;
     margin-top: 40px;
 }

 .footer-container {
     display: flex;
     flex-wrap: wrap;
     justify-content: space-around;
     max-width: 1200px;
     margin: 0 auto;
     padding: 0 20px;
 }

 .footer-section {
     flex: 1;
     min-width: 200px;
     margin-bottom: 20px;
     padding: 0 15px;
 }

 .footer-section h3 {
     font-size: 18px;
     margin-bottom: 15px;
     position: relative;
     padding-bottom: 10px;
 }

 .footer-links {
     list-style: none;
 }

 .footer-links li {
     margin-bottom: 10px;
 }

 .footer-links a {
     color: #ccc;
     text-decoration: none;
     transition: var(--transition);
     font-size: 14px;
     display: inline-block;
 }

 .footer-links a:hover {
     color: var(--white);
     padding-left: 5px;
 }

 .footer-social {
     display: flex;
     gap: 15px;
     margin-top: 15px;
 }

 .footer-social a {
     display: inline-flex;
     align-items: center;
     justify-content: center;
     width: 36px;
     height: 36px;
     background-color: rgba(255, 255, 255, 0.1);
     border-radius: 50%;
     color: var(--white);
     transition: var(--transition);
 }

 .footer-social a:hover {
     background-color: var(--white);
     color: var(--primary-color);
     transform: translateY(-3px);
 }

 .footer-bottom {
     text-align: center;
     padding-top: 20px;
     margin-top: 20px;
     border-top: 1px solid rgba(255, 255, 255, 0.1);
     font-size: 14px;
     color: #ccc;
 }

 /* ===== 响应式设计 ===== */
 @media (min-width: 481px) {
     .header-logo img {
         width: 200px;
     }

     .header-logo p {
         font-size: 1.1rem;
     }
 }

 @media (max-width: 768px) {
     .desktop-nav {
         display: none;
     }

     .mobile-breadcrumb {
         display: flex;
     }

     .footer-section {
         min-width: 100%;
         text-align: center;
     }

     .footer-section h3::after {
         left: 50%;
         transform: translateX(-50%);
     }

     .footer-social {
         justify-content: center;
     }
 }

 @media (min-width: 769px) {
     .content {
         padding: 0 20px;
     }

     .header-section {
         display: block;
     }

     .header-logo {
         padding: 10px 40px;
     }

     .header-logo img {
         width: 260px;
         max-height: 100px;
     }

     .header-logo div {
         margin-top: 15px;
     }

     .header-logo p {
         font-size: 1.4rem;
     }

     .desktop-nav {
         padding: 0 20px;
     }

     .nav-link {
         padding: 20px 15px;
         font-size: 16px;
     }

     .mobile-breadcrumb {
         display: none;
     }

     .content {
         padding: 0 20px;
     }

     .footer-section {
         min-width: 220px;
     }
 }