/* 在线编程下拉菜单样式 */
    .nav-programming {
        position: relative;
        cursor: pointer;
    }

    .nav-programming .dropdown-menu {
        position: absolute;
        top: 100%;
        left: 50%;
        transform: translateX(-50%);
        min-width: 140px;
        background: #fff;
        border-radius: 8px;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        opacity: 0;
        visibility: hidden;
        transition: all 0.25s ease;
        z-index: 1000;
        padding: 8px 0;
        margin-top: 0;
    }

    /* 创建透明连接桥，解决鼠标移动时菜单消失的问题 */
    .nav-programming .dropdown-menu::before {
        content: '';
        position: absolute;
        top: -20px;
        left: 0;
        right: 0;
        height: 20px;
        background: transparent;
    }

    /* 小三角箭头 */
    .nav-programming .dropdown-menu::after {
        content: '';
        position: absolute;
        top: -6px;
        left: 50%;
        transform: translateX(-50%);
        border-left: 6px solid transparent;
        border-right: 6px solid transparent;
        border-bottom: 6px solid #fff;
    }

    .nav-programming:hover .dropdown-menu {
        opacity: 1;
        visibility: visible;
        margin-top: 8px;
        display: block;
    }

    .nav-programming .dropdown-item {
        display: block;
        padding: 10px 20px;
        color: #333;
        text-decoration: none;
        font-size: 14px;
        transition: all 0.2s ease;
        white-space: nowrap;
        line-height: 24px;
    }

    .nav-programming .dropdown-item:hover {
        background: #f5f7fa;
        color: #409eff;
    }

    .nav-programming .dropdown-item i {
        margin-right: 8px;
        width: 16px;
        text-align: center;
    }