@media (max-width: 1120px) {



    /* 顶部栏 */
    .header {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 60px;
        background-color: #fff;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0 10px;
        z-index: 1000;
        animation: slideDownHeader 0.4s ease-out;
    }

    @keyframes slideDownHeader {
        from { transform: translateY(-100%); opacity: 0; }
        to { transform: translateY(0); opacity: 1; }
    }

    .logo {
        font-size: 1.4rem;
        font-weight: 700;
        color: #2c3e50;
        text-decoration: none;
        display: flex;
        align-items: center;
        gap: 8px;
        transition: transform 0.3s ease;
    }

    .logo:hover {
        transform: scale(1.05);
    }

    .logo-icon {
        color: #3498db;
        font-size: 1.3rem;
    }

    /* 菜单按钮 */
    .menu-toggle {
        width: 44px;
        height: 44px;
        background: none;
        border: none;
        cursor: pointer;
        font-size: 1.5rem;
        color: #2c3e50;
        display: flex;
        align-items: center;
        justify-content: center;
        z-index: 1002;
        transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        position: relative;
        overflow: hidden;
    }

    .menu-toggle:hover {
        transform: scale(1.1);
    }

    .menu-toggle::before {
        content: '';
        position: absolute;
        width: 100%;
        height: 100%;
        background-color: rgba(52, 152, 219, 0.1);
        border-radius: 50%;
        transform: scale(0);
        transition: transform 0.3s ease;
    }

    .menu-toggle:hover::before {
        transform: scale(1);
    }

    /* 导航菜单 - 全屏 */
    .nav-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: #fff;
        z-index: 1001;
        overflow-y: auto;
        display: none;
        flex-direction: column;
        opacity: 0;
        transform: translateY(20px);

    }

    .nav-overlay.active {
        display: flex;
        opacity: 1;
        transform: translateY(0);
    }

    /* 导航头部 - 固定顶部 */
    .nav-header {
        height: 60px;
        background-color: #fff;
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 0 10px;
        border-bottom: 1px solid #eee;
        position: sticky;
        top: 0;
        z-index: 2;

        transform-origin: top;
    }

    @keyframes slideDownNavHeader {
        from { transform: translateY(-20px); opacity: 0; }
        to { transform: translateY(0); opacity: 1; }
    }

    /* 导航内容 */
    .nav-content {
        flex: 1;
        overflow-y: auto;
        padding: 0px 0 100px;
    }

    /* 主菜单项 */
    .nav-item {
        border-bottom: 1px solid #eee;
        overflow: hidden;

    }

    .nav-item:nth-child(1) { animation-delay: 0.1s; }
    .nav-item:nth-child(2) { animation-delay: 0.15s; }
    .nav-item:nth-child(3) { animation-delay: 0.2s; }
    .nav-item:nth-child(4) { animation-delay: 0.25s; }
    .nav-item:nth-child(5) { animation-delay: 0.3s; }
    .nav-item:nth-child(6) { animation-delay: 0.35s; }

    @keyframes fadeInUpItem {
        from { opacity: 0; transform: translateY(20px); }
        to { opacity: 1; transform: translateY(0); }
    }

    .nav-item-header {
        padding: 18px 20px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        font-size: 1.1rem;
        color: #2c3e50;
        position: relative;
        overflow: hidden;
    }

    /* 菜单项标题链接 */
    .nav-item-title {
        flex: 1;
        text-decoration: none;
        color: inherit;
        font-size: 18px;
        font-weight: bold;
        padding-right: 15px;
        transition: all 0.3s ease;
        position: relative;
        display: block;
    }

    .nav-item-title:hover {
        color: #3498db;
        transform: translateX(5px);
    }

    .nav-item-title::before {
        content: '';
        position: absolute;
        left: 0;
        top: 50%;
        width: 0;
        height: 2px;
        background-color: #3498db;
        transform: translateY(-50%);
        transition: width 0.3s ease;
    }

    .nav-item-title:hover::before {
        width: 8px;
    }

    /* 下拉菜单按钮 */
    .submenu-toggle {
        width: 36px;
        height: 36px;
        background: none;
        border: none;
        cursor: pointer;
        display: flex;
        align-items: center;
        justify-content: center;

        border-radius: 50%;
        color: #95a5a6;
        font-size: 0.9rem;
        position: relative;
        z-index: 1;
    }

    .submenu-toggle:hover {

        color: #3498db;

    }

    .submenu-toggle.active {
        transform: rotate(90deg);

        color: #3498db;
    }

    /* 子菜单 */
    .submenu {
        background-color: #f8f9fa;
        max-height: 0;
        overflow: hidden;

        opacity: 0;
    }

    .submenu.active {
        max-height: 500px;
        opacity: 1;
    }

    .submenu-item {
        padding: 16px 20px 16px 40px;
        border-bottom: 1px solid #eee;
        color: #555;
        text-decoration: none;
        display: block;
        font-size: 1.2rem;
        transition: all 0.3s ease;
        position: relative;
        overflow: hidden;
    }

    .submenu-item::before {
        content: '';
        position: absolute;
        left: 0;
        top: 0;
        width: 4px;
        height: 100%;
        background-color: #3498db;
        transform: translateX(-10px);
        transition: transform 0.3s ease;
    }

    .submenu-item:hover::before {
        transform: translateX(0);
    }

    .submenu-item:hover {
        background-color: #f0f3f5;
        color: #3498db;
        padding-left: 45px;
    }

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

    /* 子菜单项动画 */
    .submenu-item {
        opacity: 0;
        transform: translateX(-10px);

    }

    .submenu.active .submenu-item {
        opacity: 1;
        transform: translateX(0);
    }

    .submenu.active .submenu-item:nth-child(1) { transition-delay: 0.05s; }
    .submenu.active .submenu-item:nth-child(2) { transition-delay: 0.1s; }
    .submenu.active .submenu-item:nth-child(3) { transition-delay: 0.15s; }
    .submenu.active .submenu-item:nth-child(4) { transition-delay: 0.2s; }
    .submenu.active .submenu-item:nth-child(5) { transition-delay: 0.25s; }

    /* 关闭按钮 */
    .close-btn {
        width: 44px;
        height: 44px;
        background: none;
        border: none;
        cursor: pointer;
        font-size: 1.3rem;
        color: #2c3e50;
        display: flex;
        align-items: center;
        justify-content: center;

        position: relative;
        border-radius: 50%;
    }

    .close-btn:hover {
        transform: rotate(90deg);
        background-color: rgba(52, 152, 219, 0.1);
        color: #3498db;
    }

    /* 菜单打开时body不滚动 */
    body.menu-open {
        overflow: hidden;
    }

    /* 点击波纹效果 */
    .ripple {
        position: absolute;
        border-radius: 50%;

        transform: scale(0);
        animation: ripple 0.6s linear;
        pointer-events: none;
    }

    @keyframes ripple {
        to {
            transform: scale(4);
            opacity: 0;
        }
    }

    /* 无子菜单的菜单项样式 */
    .nav-item-link {
        padding: 18px 20px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        text-decoration: none;
        color: #2c3e50;
        font-size: 1.1rem;
        transition: all 0.3s ease;
        position: relative;
        overflow: hidden;
    }

    .nav-item-link:hover {
        background-color: #f8f9fa;
        color: #3498db;
        padding-left: 25px;
    }

    .nav-item-link-icon {
        font-size: 0.9rem;
        color: #95a5a6;
        transition: all 0.3s ease;
    }

    .nav-item-link:hover .nav-item-link-icon {
        color: #3498db;
    }





}