.banner {
    position: relative;
    width: 100%;
    height: 600px;
    background: url(../images/03.jpg) no-repeat center;
    background-size: cover;
}
.banner .abt {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    color: #fff;
    font-size: 48px;
}
.bigbox .main {
    box-sizing: border-box;
    width: 1200px;
    margin: 0 auto;
    padding: 0 30px;
    padding-bottom: 90px;
}
.bigbox .main .mbx {
    padding: 50px 0 2.6075vw;
    color: #fff;
    font-size: 14px;
}
.bigbox .main .mbx a {
    color: #fff;
}
.bigbox .main ul {
    float: left;
    margin-top: 89px;
}
.bigbox .main ul li a {
    display: block;
    width: 196px;
    height: 74px;
    font-size: 16px;
    text-align: center;
    line-height: 74px;
}
.bigbox .main ul li .choose {
    background: #2b2b2b;
}
.bigbox .main a:hover {
    background: #2b2b2b;
}
.bigbox .main .line {
    float: left;
    position: relative;
    width: 1px;
    height: 895px;
    background: #6a6a6a;
}
.bigbox .main .line .yuan {
    position: absolute;
    bottom: -11px;
    left: -5px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: #faaa10;
}
.bigbox .main .certificate {
    float: right;
    width: 840px;
    margin-top: 60px;
}
.bigbox .main .certificate .imgbox {
    float: left;
    position: relative;
    width: 230px;
    height: 328px;
    margin: 23px;
    overflow: hidden;
}
.bigbox .main .certificate .imgbox .zhengshu {
    display: block;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    -o-transform: translate(-50%,-50%);
    -moz-transform: translate(-50%,-50%);
    -ms-transform: translate(-50%,-50%);
    -webkit-transform: translate(-50%,-50%);
    width: 100%;
    cursor: pointer;
}
/* 遮罩 */
.rybg {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgb(0, 0, 0,.7);
}
.rybg .bgbox {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    -o-transform: translate(-50%,-50%);
    -moz-transform: translate(-50%,-50%);
    -ms-transform: translate(-50%,-50%);
    -webkit-transform: translate(-50%,-50%);
    /* width: 300px;
    height: 429px; */
    width: 23.4375vw;
    height: 33.5156vw;
    overflow: hidden;
}
.rybg .bgbox .bgimg {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    -o-transform: translate(-50%,-50%);
    -moz-transform: translate(-50%,-50%);
    -ms-transform: translate(-50%,-50%);
    -webkit-transform: translate(-50%,-50%);
    width: 100%;
}
/* 遮罩 */



@media screen and (max-width: 1199px) {
    .bigbox .main {
        width: 100%;
    }
    .bigbox .main .line {
        height: 79.5vw;
    }
    .bigbox .main .certificate {
        width: 77%;
    }
    .bigbox .main .certificate .imgbox {
        width: 19.1667vw;
        height: 27.4075vw;
    }
}
@media screen and (max-width: 991px) {
    .bigbox .main ul li a {
        width: 150px;
        height: 56px;
        line-height: 56px;
    }
    .bigbox .main .certificate {
        width: 75%;
    }
    .bigbox .main .certificate .imgbox {
        margin: 1.3208vw;
    }
}
@media screen and (max-width: 767px) {
    .banner {
        height: 350px;
    }
    .banner .abt {
        font-size: 30px;
    }
    .bigbox .main {
        padding: 0 15px;
        padding-bottom: 90px;
    }
    .bigbox .main .mbx {
        padding: 5.2083vw 0;
    }
    .bigbox .main ul {
        float: none;
        margin-top: 20px;
        text-align: center;
    }
    .bigbox .main ul li {
        float: left;
        width: calc((100% - 10px) / 2);
    }
    .bigbox .main ul li:nth-of-type(3n+2) {
        margin: 0;
    }
    .bigbox .main ul li:nth-of-type(odd) {
        margin-right: 10px;
    }
    .bigbox .main ul li:nth-of-type(n+3) {
        margin-top: 10px;
    }
    .bigbox .main ul li a {
        box-sizing: border-box;
        border: 1px solid #faaa10;
        width: 100%;
        height: 45px;
        font-size: 14px;
        line-height: 44px;
    }
    .bigbox .main ul li .choose {
        background: #faaa10;
    }
    .bigbox .main .line {
        display: none;
    }
    .bigbox .main .certificate {
        float: none;
        width: 100%;
        margin-top: 7.82268vw;
    }
    .bigbox .main .certificate .imgbox {
        /* width: 100%; */
        width: calc((100% - 10px) / 2);
        height: auto;
        margin: 1.3208vw 0;
    }
    .bigbox .main .certificate .imgbox:nth-child(odd) {
        padding-right: 10px;
    }
    .bigbox .main .certificate .imgbox .zhengshu {
        display: block;
        position: static;
        transform: none;
        -o-transform: none;
        -moz-transform: none;
        -ms-transform: none;
        -webkit-transform: none;
        width: 100%;
    }
}
@media screen and (max-width: 425px) {
    .bigbox .main ul li {
        width: calc((100% - 10px) / 2);
    }
    .bigbox .main ul li:nth-of-type(3n+2) {
        margin: 0;
    }
    .bigbox .main ul li:nth-of-type(odd) {
        margin-right: 10px;
    }
    .bigbox .main ul li:nth-of-type(n+3) {
        margin-top: 10px;
    }
}