@media only screen and (min-width: 100px) and (max-width: 640px) {
    .header{
        display: none;
    }
    .banner{
        display: none;
    }
    .m_top{
        display: block;
        position: fixed;
        top: 0;
        background: #ffffff;
        width: 100%;
        box-sizing: border-box;
        justify-content: space-between;
        align-items: center;
        padding: 0 14px;
        height: 44px;
    }
    .m_top .logo{
        align-items: center;
        width: 57.6px;
    }
    .m_top .logo img{
        width: 100%;
        display: block;
    }
    .m_top .right_content{
        align-items: center;
    }
    .m_top .right_content .user{
        width: 18px;
        height: 18px;
        display: block;
        margin-right: 18px;
    }
    .m_top .right_content .user img{
        width: 100%;
        height: 100%;
        display: block;
    }
    .m_top .right_content span:last-child{
        display: inline-block;
        width: 18px;
        height: 18px;
    }
    .m_top .right_content span:last-child img{
        width: 100%;
    }
    .m_top .right_content .login{
        font-size: 14px;
        font-family: Microsoft YaHei;
        font-weight: 400;
        color: #FFFFFF;
        background: #ff464e;
        border-radius: 12px;
        padding: 2px 10px;
    }
    .m_top .registered {
        font-size: 14px;
        font-family: Microsoft YaHei;
        font-weight: 400;
        color: #ff464e;
        padding: 2px 10px;
        border: 1px solid #ff464e;
        border-radius: 12px;
        margin: 0 14px 0 5px;
    }
    .m_bg_img{
        display: block;
    }
    .m_bg_img img{
        width:100%;
        display: block;
    }
    .wall{
        height: 44px;
    }
    .wrap{
        width: auto;
    }
    .main .advertising{
        display: block;
        padding: 12px 14px 0;
        font-size: 0;
        margin-top: 0;
    }
    .main .new_goods_title span{
        font-size: 14px;
        padding-left: 5px;
        line-height: normal;
    }
    .main .advertising div{
        display: inline-block;
        width: 49%;
    }
    .main .advertising div img{
        width: 100%;
    }
    .main .advertising div:nth-child(even) {
        margin-left: 2%;
    }
    .main .advertising div:nth-child(n + 3) {
        margin-top: 8px;
    }
    .main .new_goods_title{
        margin: 12px 0 0 14px;
        border: 0;
        height: auto;
    }
    .main .recommend {
        flex-wrap: wrap;
        margin-top: 0;
        padding: 4px 14px 0;
    }
    .main .recommend .item{
        width: 49%;
        height: auto;
        margin-left: 0;
        margin-bottom: 0;
    }
    .main .recommend .item:nth-child(n + 3) {
        margin-top: 8px;
    }
    .main .recommend .item:nth-child(even){
        margin-left: 2%;
    }
    .main .recommend .item .recommend_left{
        width: 100%;
        height: 100%;
    }
    .main .recommend .item .recommend_left img{
        width: 100%;
        height: 100%;
        -o-object-fit: cover;
        object-fit: cover;
        display: block;
    }
    .main .recommend .item dl{
        height: 100%;
        width: 100%;
        box-sizing: border-box;
    }
    .main .recommend .item dl dt{
        width: 100%;
        height: calc(49vw - 14px);
    }
    .main .recommend .item dl img{
        width: 100%;
        height: 100%;
    }
    .main .recommend .item dl .title{
        overflow: hidden;
        white-space: nowrap;
        text-overflow: ellipsis;
        font-size: 10px;
        color: #999;
        line-height: 22px;
        padding: 0 5px;
    }
    .main .recommend .item dl .other .price{
        font-size: 14px;
    }
    .main .recommend .item dl .other .wei{
        font-size: 11px;
    }
    .main .recommend .item dl .btn{
        margin: 6px 9px 2% 9px;
        width: auto;
        font-size: 12px;
    }
    .main .section4 .article_list .article_item{
        width: 96%;
        box-sizing: border-box;
        margin:10px auto;
        padding: 10px 12px;
    }
    .main .section4 .article_list .article_item .title a{
        flex: 1;
        overflow: hidden;
        white-space: nowrap;
        text-overflow: ellipsis;
        margin-right: 10px;
    } 
    .d_flex{
        display: flex;
    }
    .xian{
        display: none;
    }
    .footer_wrap{
        padding: 0 14px;
        margin-top: 10px;
    }
    .footer_wrap ul{
        flex-wrap: wrap;
    }
    .footer_wrap ul li{
        width: 50%;
        height: auto;
        display: flex;
    }
    .footer_wrap ul li img{
        margin-top: 0;
    }
    .footer_wrap ul li:not(:first-child) {
        margin-left: 0;
    }
    .footer_wrap ul li .info {
        margin-top: 15px;
        margin-left: 0;
    }
    .footer_wrap ul li .info .title{
        color: #000000;
        font-size: 14px;
        font-weight: bold;
        line-height: normal;
    }
    .footer_wrap ul li .info .desc{
        font-size: 10px;
        color: #999;
    }
    .footer_wrap .copyright{
        margin-top: 15px;
    }
    .footer_wrap .copyright .jc{
        margin-bottom: 0;
        padding-bottom: 42px;
        margin-top: 9px;
        line-height: normal;
    }
    .mask{
        position: fixed;
        top: 44px;
        bottom: 0;
        left: 0;
        right: 0;
        display: none;
        background: rgba(0,0,0,0.5);
        z-index: 2;
        /* animation: maskOpacity 3s; */
    }
    .mask_left{
        width: 35%;
        text-align: center;
        position: fixed;
        top: 44px;
        background: #fff;
        bottom: 0;
        right: 0;
        font-size: 14px;
        font-family: Microsoft YaHei;
        font-weight: 400;
        color: #666666;
        transition: transform 0.5s;
        display: block;
        transform: translateX(100%);
        z-index: 2;
    }
    .mask_left_t{
        transform: translateX(0%);
        display: block;
    }
    .mask_left a{
        display: block;
        padding: 9px 0;
        border-bottom: 1px solid #eee;
    }
}