.header_top{
    background: #fff;
    color: #999;
}
.header_top .logo {
    background: url(../images/logo2.png) center no-repeat;
}
.header_top .menu .menu-item .menu_a, .header_top_scroll .menu .home .menu_a {
    color: #777;
}
.banner {
    width: 100%;
    max-width: 1920px;
    margin: 64px auto 0 auto;
    display: block;
}
.banner_content{
    display: none;
    width: 100%;
    height: 460px;
    position: relative;
    overflow: hidden;
}
.banner_content img{
    width: 1920px;
    position: relative;
    left: 50%;
    margin-left: -960px;
}
@media screen and (max-width: 960px) {
    .banner{
        display:none !important;
    }
    main{
        margin-top:64px;
    }
}

.about_body{
    width:100%;
    margin:20px auto;
}

.about_infos,
.about_culture,
.about_cert,
.about_partner{
    width: 100%;
    max-width: 1920px;
    background:none;
    text-align: center;
}

.about_infos_image{
    width: 100%;
    max-width: 1200px;
    margin: 20px auto;
    display: block;
}
.about_infos_image img{
    width: 100%;
}
.about_infos_nums{
    width: 100%;
    max-width: 1200px;
    margin: 50px auto;
    display: flex;
    justify-content: space-between;
    flex-direction: row;
    flex-wrap: wrap;
}
.about_infos_item{
    width:25%;
    margin:10px auto;
    text-align: center;
    display: flex;
    justify-content: flex-start;
    flex-direction: column;
    flex-wrap: wrap;
}
.about_infos_item:nth-child(4){
    width:25%;
}

.about_infos_item ico{
    display: block;
    width:86px;
    height:52px;
    margin: 0 auto;
    color:#03c;
}
.about_infos_item:nth-child(1) ico{
    background: url(../images/about/about1.png) center no-repeat;
    background-size: 86px 86px;
}
.about_infos_item:nth-child(2) ico{
    background: url(../images/about/about2.png) center no-repeat;
    background-size: 86px 86px;
}
.about_infos_item:nth-child(3) ico{
    background: url(../images/about/about3.png) center no-repeat;
    background-size: 86px 86px;
}
.about_infos_item:nth-child(4) .about_infos_item_icos{
    display: flex;
    justify-content: space-between;
    flex-direction: row;
    flex-wrap: wrap;
}
.about_infos_item:nth-child(4) .about_infos_item_ico{
    width:50%;
}
.about_infos_item:nth-child(4) .about_infos_item_icos .about_infos_item_ico:nth-child(1) ico{
    background: url(../images/about/about4.png) center no-repeat;
    background-size: 86px 86px;
}
.about_infos_item:nth-child(4) .about_infos_item_icos .about_infos_item_ico:nth-child(2) ico{
    background: url(../images/about/about5.png) center no-repeat;
    background-size: 86px 86px;
}
.about_infos_item_title{
    font-size: 18px;
    font-weight: bold;
    margin: 20px auto 0 auto;
    height: 50px;
    display: block;
}
.about_infos_item_line{
    width:100%;
    height:1px;
    background:none;
    border:none;
    padding:0;
    margin:0 auto;
}
.about_infos_item_desc{
    font-size: 12px;
    color: #333;
    text-align: justify;
    padding: 10px;
}
.about_infos_text{
    width: 100%;
    max-width: 1200px;
    margin:20px auto;
    padding:0;
    font-size:14px;
    line-height: 2;
    text-align: justify;
    color:#333;
}

.about_culture{
    background:#fff;
}
.about_culture_title{
    width: 100%;
    max-width: 1200px;
    margin:0 auto;
    padding: 50px 0;
    text-align: center;
}
.about_culture_title span{
    display: block;
    font-size: 32px;
    font-weight: bold;
}
.about_culture_list{
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding-bottom: 30px;
    display: flex;
    justify-content: space-between;
    flex-direction: row;
    flex-wrap: wrap;
}

.about_culture_item{
    width:23%;
    position: relative;
    color:#fff;
}
.about_culture_item img{
    width: 100%;
    height: 100%;
    border-radius: 10px;
}
.about_culture_infos{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    line-height: 1;
    text-align: center;
    font-size: 32px;
    opacity: 0.5;
    background:#000;
    border-radius: 10px;
    display:table; 
}
.about_culture_infos:hover{
    opacity: 0.9;
    background:#09c;
}

.about_culture_infos span{
    vertical-align: middle;
    display: table-cell;
}

.about_cert_title{
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 0;
    display: flex;
    justify-content: space-between;
    flex-direction: row;
    flex-wrap: wrap;
}
.about_cert_title span{
    display: block;
    width: 30%;
    height: 50px;
    line-height: 50px;
    vertical-align: middle;
}
.about_cert_title span b{
    display: block;
    width:100%;
    height:1px;
    margin-top: 24px;
    background:#999;
}
.about_cert_title span:nth-child(1){

}
.about_cert_title span:nth-child(2){
    display: block;
    font-size: 32px;
    font-weight: bold;
}
.about_cert_title span:nth-child(3){

}
.about_cert_list{
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding-bottom: 30px;
    display: flex;
    justify-content: flex-start;
    flex-direction: row;
    flex-wrap: wrap;
}
.about_cert_item{
    width: 8%;
    margin: 1%
}
.about_cert_item img{
    width: 100%;
}

@media screen and (max-width: 1200px) {
    .about_body{
        width:98%;
        margin:0 1%;
    }
    .about_infos_image,
    .about_infos_nums,
    .about_infos_text,
    .about_culture,
    .about_cert,
    .about_partner{
        width:98%;
        margin:0 1%;
    }
    .about_infos_text{
        font-size: 16px;
        height:250px;
        overflow-y:scroll;
    }
    .about_culture_infos{
        font-size:18px;
    }
    .about_culture_title,
    .about_culture_list{
        width:98%;
        margin:0 1%;
    }
    .about_cert_title,
    .about_cert_list{
        width:98%;
        margin:0 1%;
    }
    .about_cert_item{
        width: 12%
    }
}
@media screen and (max-width: 960px) {
    .about_infos_item{
        width: 23%;
    }
    .about_infos_item:nth-child(4){
        width:31%;
    }
    .about_infos_item ico{
        width:46px;
        height:32px;
    }
    .about_infos_item:nth-child(1) ico,
    .about_infos_item:nth-child(2) ico,
    .about_infos_item:nth-child(3) ico{
        background-size: 46px 46px;
    }
    .about_infos_item:nth-child(4) .about_infos_item_icos .about_infos_item_ico:nth-child(1) ico{
        background-size: 46px 46px;
    }
    .about_infos_item:nth-child(4) .about_infos_item_icos .about_infos_item_ico:nth-child(2) ico{
        background-size: 46px 46px;
    }
    .about_infos_item_title {
        font-size: 12px;
    }
    .about_infos_item_desc{
        display: none;
    }
    .about_infos_text{
        font-size: 12px;
    }
    .about_culture_infos{
        font-size:14px;
    }
    .about_cert_item{
        width: 18%
    }
}