/* ==================== CSS Reset (仅作用于 header 内部) ==================== */
        .header *,
        .header *::before,
        .header *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        /* ==================== 头部容器 ==================== */
        .header {
            position: sticky;
            top: 0;
            width: 100%;
            background: rgba(10, 26, 47, 0.95);
            backdrop-filter: blur(10px);
            z-index: 1000;
            transition: box-shadow 0.3s ease;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
        }

        .header.scrolled {
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }

        .header a {
            text-decoration: none;
        }

        .header .header-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 40px;
            height: 70px;
        }

        /* ==================== Logo 区域 ==================== */
        .header .logo {
            display: flex;
            flex-direction: column;
        }

        .header .logo-brand {
            font-size: 24px;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .header .logo-brand i {
            color: #2a8bf2;
            font-size: 28px;
        }

        .header .logo-slogan {
            font-size: 11px;
            color: rgba(255, 255, 255, 0.6);
            letter-spacing: 0.5px;
            margin-top: 2px;
        }

        /* ==================== 导航菜单 ==================== */
        .header .nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .header .nav-item {
            position: relative;
        }

        .header .nav-link {
            display: block;
            padding: 10px 16px;
            color: rgba(255, 255, 255, 0.85);
            font-size: 14px;
            font-weight: 500;
            border-radius: 6px;
            transition: all 0.25s ease;
            position: relative;
        }

        .header .nav-link::after {
            content: '';
            position: absolute;
            bottom: 6px;
            left: 16px;
            right: 16px;
            height: 2px;
            background: #2a8bf2;
            transform: scaleX(0);
            transition: transform 0.25s ease;
        }

        .header .nav-link:hover {
            color: #fff;
            background: rgba(42, 139, 242, 0.15);
        }

        .header .nav-link:hover::after {
            transform: scaleX(1);
        }

        /* 下拉菜单触发器 */
        .header .has-dropdown > .nav-link {
            padding-right: 32px;
        }

        .header .has-dropdown > .nav-link::before {
            content: '\f107';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 12px;
            opacity: 0.7;
            transition: transform 0.25s ease;
        }

        .header .has-dropdown:hover > .nav-link::before {
            transform: translateY(-50%) rotate(180deg);
        }

        /* 下拉面板 */
        .header .dropdown-panel {
            position: absolute;
            top: 100%;
            left: 0;
            min-width: 220px;
            background: #fff;
            border-radius: 8px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: all 0.25s ease;
            padding: 12px 0;
            margin-top: 8px;
        }

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

        .header .dropdown-item {
            display: block;
            padding: 12px 20px;
            color: #333;
            font-size: 14px;
            transition: all 0.2s ease;
            border-left: 3px solid transparent;
        }

        .header .dropdown-item:hover {
            background: #f5f9ff;
            color: #2a8bf2;
            border-left-color: #2a8bf2;
        }

        .header .dropdown-item i {
            margin-right: 10px;
            width: 16px;
            color: #2a8bf2;
        }

        /* ==================== 右侧功能区 ==================== */
        .header .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        /* 搜索区域 */
        .header .search-wrapper {
            position: relative;
        }

        .header .search-icon {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: transparent;
            border: none;
            color: rgba(255, 255, 255, 0.85);
            cursor: pointer;
            border-radius: 50%;
            transition: all 0.25s ease;
            font-size: 18px;
        }

        .header .search-icon:hover {
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
        }

        .header .search-box {
            position: absolute;
            top: 50%;
            right: 0;
            transform: translateY(-50%);
            opacity: 0;
            visibility: hidden;
            display: flex;
            align-items: center;
            background: #fff;
            border-radius: 25px;
            padding: 4px 4px 4px 16px;
            min-width: 280px;
            transition: all 0.3s ease;
        }

        .header .search-box.active {
            opacity: 1;
            visibility: visible;
            right: 44px;
        }

        .header .search-box input {
            border: none;
            outline: none;
            font-size: 14px;
            flex: 1;
            padding: 8px 0;
            background: transparent;
            color: #333;
        }

        .header .search-box input::placeholder {
            color: #999;
        }

        .header .search-box .close-btn {
            width: 32px;
            height: 32px;
            border: none;
            background: #f0f0f0;
            border-radius: 50%;
            cursor: pointer;
            color: #666;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-left: 8px;
            transition: all 0.2s ease;
        }

        .header .search-box .close-btn:hover {
            background: #e0e0e0;
        }

        /* 分隔线 */
        .header .divider {
            width: 1px;
            height: 24px;
            background: rgba(255, 255, 255, 0.2);
        }

        /* 用户菜单 */
        .header .user-menu {
            position: relative;
        }

        .header .user-btn {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 16px;
            background: transparent;
            border: 1px solid rgba(42, 139, 242, 0.5);
            color: #2a8bf2;
            border-radius: 6px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.25s ease;
        }

        .header .user-btn:hover {
            background: rgba(42, 139, 242, 0.15);
            border-color: #2a8bf2;
        }

        .header .user-btn i {
            font-size: 16px;
        }

        .header .user-dropdown {
            position: absolute;
            top: 100%;
            right: 0;
            min-width: 180px;
            background: #fff;
            border-radius: 8px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: all 0.25s ease;
            padding: 12px 0;
            margin-top: 8px;
        }

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

        .header .user-dropdown .dropdown-header {
            padding: 12px 20px;
            border-bottom: 1px solid #eee;
            margin-bottom: 8px;
        }

        .header .user-dropdown .user-name {
            font-weight: 600;
            color: #333;
            font-size: 14px;
        }

        .header .user-dropdown .user-email {
            font-size: 12px;
            color: #999;
            margin-top: 2px;
        }

        /* 汉堡菜单 */
        .header .mobile-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            background: transparent;
            border: none;
            cursor: pointer;
        }

        .header .mobile-toggle span {
            width: 24px;
            height: 2px;
            background: rgba(255, 255, 255, 0.9);
            transition: all 0.3s ease;
            border-radius: 2px;
        }

        .header .mobile-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }

        .header .mobile-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .header .mobile-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ==================== 移动端响应式 ==================== */
        .header .mobile-nav {
            display: none;
            position: fixed;
            top: 70px;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(10, 26, 47, 0.98);
            backdrop-filter: blur(20px);
            padding: 20px 40px;
            overflow-y: auto;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
        }

        .header .mobile-nav.active {
            opacity: 1;
            visibility: visible;
        }

        .header .mobile-nav-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .header .mobile-nav-link {
            display: block;
            padding: 16px 20px;
            color: rgba(255, 255, 255, 0.85);
            font-size: 16px;
            font-weight: 500;
            border-radius: 8px;
            transition: all 0.25s ease;
        }

        .header .mobile-nav-link:hover {
            background: rgba(42, 139, 242, 0.15);
            color: #fff;
        }

        .header .mobile-nav-item {
            list-style: none;
        }

        .header .mobile-nav-item.has-dropdown .mobile-submenu {
            display: none;
            list-style: none;
            padding-left: 20px;
            margin-top: 8px;
        }

        .header .mobile-nav-item.has-dropdown.open .mobile-submenu {
            display: block;
        }

        .header .mobile-submenu .dropdown-item {
            display: flex;
            align-items: center;
            padding: 12px 16px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 14px;
        }

        .header .dropdown-toggle {
            display: none;
            background: transparent;
            border: none;
            color: rgba(255, 255, 255, 0.5);
            cursor: pointer;
            padding: 8px;
            font-size: 14px;
        }

        @media (max-width: 1024px) {
            .header .header-container {
                padding: 0 24px;
            }

            .header .nav {
                display: none;
            }

            .header .mobile-toggle {
                display: flex;
            }

            .header .mobile-nav {
                display: block;
            }

            .header .search-box {
                right: 0;
            }

            .header .search-box.active {
                right: 40px;
                min-width: 240px;
            }

            .header .header-actions {
                gap: 8px;
            }
        }

        @media (max-width: 768px) {
            .header .header-container {
                padding: 0 16px;
                height: 60px;
            }

            .header .logo-brand {
                font-size: 20px;
            }

            .header .logo-slogan {
                display: none;
            }

            .header .user-btn span {
                display: none;
            }

            .header .search-box.active {
                position: fixed;
                top: 60px;
                left: 16px;
                right: 16px;
                min-width: auto;
                transform: none;
                margin-top: 0;
                z-index: 999;
            }
        }

        /* ==================== Logo 区域 ==================== */
        .logo {
            display: flex;
            flex-direction: column;
            text-decoration: none;
        }

        .logo-brand {
            font-size: 24px;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .logo-brand i {
            color: #2a8bf2;
            font-size: 28px;
        }

        .logo-slogan {
            font-size: 11px;
            color: rgba(255, 255, 255, 0.6);
            letter-spacing: 0.5px;
            margin-top: 2px;
        }

        /* ==================== 导航菜单 ==================== */
        .nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .nav-item {
            position: relative;
        }

        .nav-link {
            display: block;
            padding: 10px 16px;
            color: rgba(255, 255, 255, 0.85);
            text-decoration: none;
            font-size: 14px;
            font-weight: 500;
            border-radius: 6px;
            transition: all 0.25s ease;
            position: relative;
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 6px;
            left: 16px;
            right: 16px;
            height: 2px;
            background: #2a8bf2;
            transform: scaleX(0);
            transition: transform 0.25s ease;
        }

        .nav-link:hover {
            color: #fff;
            background: rgba(42, 139, 242, 0.15);
        }

        .nav-link:hover::after {
            transform: scaleX(1);
        }

        /* 下拉菜单触发器 */
        .has-dropdown > .nav-link {
            padding-right: 32px;
        }

        .has-dropdown > .nav-link::before {
            content: '\f107';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            position: absolute;
            right: 12px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 12px;
            opacity: 0.7;
            transition: transform 0.25s ease;
        }

        .has-dropdown:hover > .nav-link::before {
            transform: translateY(-50%) rotate(180deg);
        }

        /* 下拉面板 */
        .dropdown-panel {
            position: absolute;
            top: 100%;
            left: 0;
            min-width: 220px;
            background: #fff;
            border-radius: 8px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: all 0.25s ease;
            padding: 12px 0;
            margin-top: 8px;
        }

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

        .dropdown-item {
            display: block;
            padding: 12px 20px;
            color: #333;
            text-decoration: none;
            font-size: 14px;
            transition: all 0.2s ease;
            border-left: 3px solid transparent;
        }

        .dropdown-item:hover {
            background: #f5f9ff;
            color: #2a8bf2;
            border-left-color: #2a8bf2;
        }

        .dropdown-item i {
            margin-right: 10px;
            width: 16px;
            color: #2a8bf2;
        }

        /* ==================== 右侧功能区 ==================== */
        .header-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        /* 搜索区域 */
        .search-wrapper {
            position: relative;
        }

        .search-icon {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: transparent;
            border: none;
            color: rgba(255, 255, 255, 0.85);
            cursor: pointer;
            border-radius: 50%;
            transition: all 0.25s ease;
            font-size: 18px;
        }

        .search-icon:hover {
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
        }

        .search-box {
            position: absolute;
            top: 50%;
            right: 0;
            transform: translateY(-50%);
            opacity: 0;
            visibility: hidden;
            display: flex;
            align-items: center;
            background: #fff;
            border-radius: 25px;
            padding: 4px 4px 4px 16px;
            min-width: 280px;
            transition: all 0.3s ease;
        }

        .search-box.active {
            opacity: 1;
            visibility: visible;
            right: 44px;
        }

        .search-box input {
            border: none;
            outline: none;
            font-size: 14px;
            flex: 1;
            padding: 8px 0;
            background: transparent;
            color: #333;
        }

        .search-box input::placeholder {
            color: #999;
        }

        .search-box .close-btn {
            width: 32px;
            height: 32px;
            border: none;
            background: #f0f0f0;
            border-radius: 50%;
            cursor: pointer;
            color: #666;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-left: 8px;
            transition: all 0.2s ease;
        }

        .search-box .close-btn:hover {
            background: #e0e0e0;
        }

        /* 分隔线 */
        .divider {
            width: 1px;
            height: 24px;
            background: rgba(255, 255, 255, 0.2);
        }

        /* 用户菜单 */
        .user-menu {
            position: relative;
        }

        .user-btn {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 8px 16px;
            background: transparent;
            border: 1px solid rgba(42, 139, 242, 0.5);
            color: #2a8bf2;
            border-radius: 6px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.25s ease;
        }

        .user-btn:hover {
            background: rgba(42, 139, 242, 0.15);
            border-color: #2a8bf2;
        }

        .user-btn i {
            font-size: 16px;
        }

        .user-dropdown {
            position: absolute;
            top: 100%;
            right: 0;
            min-width: 180px;
            background: #fff;
            border-radius: 8px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
            opacity: 0;
            visibility: hidden;
            transform: translateY(10px);
            transition: all 0.25s ease;
            padding: 12px 0;
            margin-top: 8px;
        }

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

        .user-dropdown .dropdown-header {
            padding: 12px 20px;
            border-bottom: 1px solid #eee;
            margin-bottom: 8px;
        }

        .user-dropdown .user-name {
            font-weight: 600;
            color: #333;
            font-size: 14px;
        }

        .user-dropdown .user-email {
            font-size: 12px;
            color: #999;
            margin-top: 2px;
        }

        /* 汉堡菜单 */
        .mobile-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            background: transparent;
            border: none;
            cursor: pointer;
        }

        .mobile-toggle span {
            width: 24px;
            height: 2px;
            background: rgba(255, 255, 255, 0.9);
            transition: all 0.3s ease;
            border-radius: 2px;
        }

        .mobile-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }

        .mobile-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .mobile-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ==================== 移动端响应式 ==================== */
        .mobile-nav {
            display: none;
            position: fixed;
            top: 70px;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(10, 26, 47, 0.98);
            backdrop-filter: blur(20px);
            padding: 20px 40px;
            overflow-y: auto;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
        }

        .mobile-nav.active {
            opacity: 1;
            visibility: visible;
        }

        .mobile-nav-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .mobile-nav-link {
            display: block;
            padding: 16px 20px;
            color: rgba(255, 255, 255, 0.85);
            text-decoration: none;
            font-size: 16px;
            font-weight: 500;
            border-radius: 8px;
            transition: all 0.25s ease;
        }

        .mobile-nav-link:hover {
            background: rgba(42, 139, 242, 0.15);
            color: #fff;
        }

        .mobile-nav-item.has-dropdown .mobile-submenu {
            display: none;
            list-style: none;
            padding-left: 20px;
            margin-top: 8px;
        }

        .mobile-nav-item.has-dropdown.open .mobile-submenu {
            display: block;
        }

        .mobile-submenu .dropdown-item {
            display: flex;
            align-items: center;
            padding: 12px 16px;
            color: rgba(255, 255, 255, 0.7);
            font-size: 14px;
        }

        .dropdown-toggle {
            display: none;
            background: transparent;
            border: none;
            color: rgba(255, 255, 255, 0.5);
            cursor: pointer;
            padding: 8px;
            font-size: 14px;
        }

        @media (max-width: 1024px) {
            .header-container {
                padding: 0 24px;
            }

            .nav {
                display: none;
            }

            .mobile-toggle {
                display: flex;
            }

            .mobile-nav {
                display: block;
            }

            .search-box {
                right: 0;
            }

            .search-box.active {
                right: 40px;
                min-width: 240px;
            }

            .header-actions {
                gap: 8px;
            }
        }

        @media (max-width: 768px) {
            .header-container {
                padding: 0 16px;
                height: 60px;
            }

            .logo-brand {
                font-size: 20px;
            }

            .logo-slogan {
                display: none;
            }

            .user-btn span {
                display: none;
            }

            .search-box.active {
                position: fixed;
                top: 60px;
                left: 16px;
                right: 16px;
                min-width: auto;
                transform: none;
                margin-top: 0;
                z-index: 999;
            }
        }