/* ========== 导航栏主容器 - 纯白背景 + 粘性滑动跟随 ========== */
        .cdnavbar {
            background: #ffffff;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05), 0 1px 0 rgba(0, 0, 0, 0.02);
            position: sticky;     /* 关键: 随着页面上下滑动而固定在顶部 */
            top: 0;
            z-index: 1100;        /* 提高层级，确保覆盖其他内容 */
            width: 100%;
            border-bottom: 1px solid #eef2f6;
            transition: box-shadow 0.25s ease, border-color 0.2s;
        }

        /* 滚动时稍微加强阴影，提升质感（可选，保持视觉反馈）*/
        .cdnavbar.scrolled {
            box-shadow: 0 10px 28px -8px rgba(0, 0, 0, 0.12), 0 2px 4px -1px rgba(0, 0, 0, 0.02);
            border-bottom-color: #e2e8f0;
        }

        .cdcontainer {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            position: relative;
        }

        /* Logo 区域 - 图片形式 */
        .cdlogo {
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            line-height: 0;
        }
        .cdlogo img {
            display: block;
            height: 42px;
            width: auto;
            transition: opacity 0.2s ease;
        }
        .cdlogo:hover img {
            opacity: 0.85;
        }
        @media (max-width: 640px) {
            .cdlogo img {
                height: 34px;
            }
        }

        /* ========== 桌面端一级菜单 - 无背景悬停 ========== */
        .cdnav-menu {
            display: flex;
            align-items: center;
            list-style: none;
            gap: 6px;
            height: 68px;
            margin: 0;
        }

        .cdnav-item {
            position: relative;
            height: 100%;
            display: flex;
            align-items: center;
        }

        .cdnav-link {
            color: #334155;
            text-decoration: none;
            font-weight: 500;
            padding: 0 18px;
            height: 100%;
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 1rem;
            transition: color 0.2s ease;
            border-radius: 40px;
            white-space: nowrap;
            background: transparent;
        }

        /* 图标样式 */
        .nav-icon {
            width: 0.85rem;
            height: 0.85rem;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: transform 0.25s ease;
        }
        .nav-icon svg {
            width: 100%;
            height: 100%;
            fill: none;
            stroke: currentColor;
            stroke-width: 2.2;
            stroke-linecap: round;
            stroke-linejoin: round;
        }
        .dropdown-icon {
            width: 0.75rem;
            height: 0.75rem;
        }
        .cdnav-link .nav-icon {
            color: #5b6e8c;
        }

        /* 悬停效果 - 只改变文字颜色，无背景 */
        .cdnav-item:hover > .cdnav-link {
            color: #2563eb;
            background: transparent;
        }
        .cdnav-item:hover > .cdnav-link .dropdown-icon {
            transform: rotate(180deg);
            color: #2563eb;
        }

        /* 高亮激活菜单 - 蓝色文字 */
        .cdnav-link.active {
            color: #2563eb !important;
            background: transparent !important;
        }
        .cdnav-link.active .dropdown-icon {
            color: #2563eb !important;
        }

        /* ========== 桌面端二级菜单 ========== */
        .cdsub-menu {
            position: absolute;
            top: 100%;
            left: 0;
            background: #ffffff;
            min-width: 150px;
            list-style: none;
            border-radius: 20px;
            box-shadow: 0 20px 30px -12px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0,0,0,0.05);
            padding: 8px 0;
            opacity: 0;
            visibility: hidden;
            transform: translateY(12px);
            transition: opacity 0.25s ease, transform 0.22s ease, visibility 0.22s;
            z-index: 1150;
            border: 1px solid #eef2f8;
        }

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

        .cdsub-item {
            border-bottom: 1px solid #f0f2f7;
        }
        .cdsub-item:last-child {
            border-bottom: none;
        }

        .cdsub-link {
            display: block;
            padding: 10px 20px;
            color: #2c3e50;
            font-size: 0.9rem;
            text-decoration: none;
            transition: all 0.2s;
            font-weight: 460;
        }

        .cdsub-link:hover {
            background: #f8fafc;
            color: #1e40af;
            padding-left: 26px;
        }

        /* 移动端汉堡按钮 */
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: #1e293b;
            cursor: pointer;
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            border-radius: 40px;
            transition: background 0.2s;
        }
        .mobile-menu-btn svg {
            width: 26px;
            height: 26px;
            stroke: #1e293b;
            stroke-width: 2;
            fill: none;
            stroke-linecap: round;
            stroke-linejoin: round;
        }
        .mobile-menu-btn:active {
            background: #eef2ff;
        }

        /* ========== 移动端样式 + 滚动时导航仍然粘性 ========== */
        @media (max-width: 768px) {
            .cdcontainer {
                height: 60px;
                padding: 0 16px;
            }

            .mobile-menu-btn {
                display: flex;
            }

            .cdnav-menu {
                position: absolute;
                top: 60px;
                left: 0;
                width: 100%;
                background: #ffffff;
                flex-direction: column;
                align-items: stretch;
                height: auto;
                max-height: calc(100vh - 60px);
                overflow-y: auto;
                padding: 8px 0 24px 0;
                gap: 0;
                box-shadow: 0 18px 28px -10px rgba(0, 0, 0, 0.12);
                border-radius: 0 0 24px 24px;
                display: none;
                z-index: 1050;
                border-top: 1px solid #e9edf2;
            }

            .cdnav-menu.show {
                display: flex;
            }

            .cdnav-item {
                height: auto;
                display: block;
                border-bottom: 1px solid #edf2f7;
            }
            .cdnav-item:last-child {
                border-bottom: none;
            }

            .cdnav-link {
                justify-content: space-between;
                padding: 14px 20px;
                font-size: 1rem;
                font-weight: 500;
                white-space: normal;
                width: 100%;
                border-radius: 0;
                color: #1e2a3a;
            }

            .cdsub-menu {
                position: static;
                opacity: 1;
                visibility: visible;
                transform: none;
                background: #f9fbfe;
                box-shadow: none;
                border-radius: 0;
                padding: 0;
                margin: 0;
                width: 100%;
                display: none;
                transition: none;
                border: none;
            }

            .cdsub-link {
                padding: 12px 20px 12px 44px;
                color: #2d3a4b;
                font-size: 0.9rem;
                border-left: 2px solid transparent;
            }
            .cdsub-link:hover {
                background: #eef3fc;
                color: #1f4fcf;
                padding-left: 48px;
            }

            .cdnav-item.open .cdsub-menu {
                display: block;
            }

            .cdnav-item.open > .cdnav-link .dropdown-icon {
                transform: rotate(180deg);
                color: #2563eb;
            }
        }