.bg_1{width: 100%;text-align: center;margin-bottom: 110px}
.pc_header.white .nav li:nth-child(3) > a{color: #ff5a00}
.h-btn-div{width: 260px;height: 50px;border-radius: 40px;margin: 200px auto 30px auto;position: relative}
.h-btn-div .btn-back-div{width: 100%;line-height: 50px;color: white;font-size: 16px}
.h-btn-div .btn-back-div span{margin: auto 25px}
.h-btn-div .btn-back-div .btn-l,.h-btn-div .btn-back-div .btn-r{font-weight:bold;color:#ff5d3d;width: 130px;position:absolute;top:0px;height: 50px;background-color: white;border: 1px #ff5d3d solid;border-radius: 40px}
.h-btn-div .btn-back-div .btn-r{right: 0px;}
.h-btn-div .btn-back-div .btn-l{left: 0px;}
.h-btn-div .btn-back-div a{display: block;width: 130px;height: 48px;position: absolute;top:0px;border-radius: 40px;color: white;cursor: pointer;font-weight: bold}
.h-btn-div .btn-back-div span:nth-child(2) a{right: 0px;}
.h-btn-l .btn-l{display: block}
.h-btn-r .btn-r{display: block}

.h-btn-div .btn-back-div a:hover{
    /*margin-top: -5px;*/
    -webkit-transform: scale(1.1);
    -moz-transform: scale(1.1);
    -ms-transform: scale(1.1);
    -o-transform: scale(1.1);
    transform: scale(1.1);
}

.bg_1 .ul-div{width: 1570px;font-size: 18px;padding: 0px;margin: auto auto}
.bg_1 .ul-div ul{flex-wrap: wrap;line-height: 60px;padding: 0px}
.bg_1 ul li>a{display:block;color:#aaaaab;}
.bg_1 ul li .active{color: #ff5d3d;font-weight: 800}
.bg_1 ul li{margin: 0px auto;}
.class-con{margin-top: 60px;}
.class-con .bg-4-c{display: flex;margin-bottom: 15px;justify-content:center;}

.class-con .bg-4-c-m{visiblity:visible!important;}


.class-con .bg-4m-img{width: 100%;height: 355px;overflow: hidden;}
.class-con .bg-4m-img img{width: 100%}
.class-con .bg-4-c-m{width: 632px;position: relative;font-size: 26px;height: 495px;margin: 0 3px}
.class-con .bg-4m-t1,.bg-4m-t2{overflow: hidden;display: -webkit-box;-webkit-box-orient: vertical;-webkit-line-clamp: 2;color:#9b9b9b;}

.class-con .bg-4m-t1{font-weight: bold;margin-top: 25px;margin-bottom: 13px}
.class-con .bg-4m-t2{margin-top: 13px;margin-bottom: 25px}

.btn-down-div{width: 116px;height: 60px;margin: 90px auto;cursor: pointer;}

.m-btn-div{justify-content: space-around;margin: 205px auto 110px;width: 90%}
.m-btn-div .m-btn{width: 300px;height: 85px;background-color: #ff5d3d;color: white;font-size: 35px;justify-content: center;}
.m-btn-div .m-btn .btn-img-div{height: 11px}

.m-class-btn-div1,.m-class-btn-div2{width: 100%;height: 100%;z-index: 999;position: fixed;top: 1.05rem;left: 0px;background: rgba(0,0,0,0.8);align-items:start;}
.m-class-btn-div1 ul,.m-class-btn-div2 ul{flex-wrap: wrap;margin-top: 1rem;padding: 0px;margin-left: 0.8rem;}
.m-class-btn-div1 li,.m-class-btn-div2 li{display: inline-block;margin: 0.2rem 0}
.m-class-btn-div1 a,.m-class-btn-div2 a{color: white;display: block;width: 3rem;height: 1rem;font-size: 0.4rem;line-height: 1rem;text-align: center;}
.m-class-btn-div2 a{width: 6rem;height: 1rem}

.close-div{position: absolute;width: 0.65rem;height: 0.65rem;right: 0.5rem;top:0.5rem}
.close-div img{width: 100%;height: 100%}

@media (max-width: 750px) {
    .class-con .bg-4-c{flex-direction:column;margin-bottom: 0px}
    .class-con .bg-4-c-m{width: 750px;height: 600px}
    .class-con .bg-4-c-m .bg-4m-img>img{width: 100%}
    .class-con .bg-4m-t1{font-size: 36px;margin: 30px 0px;font-weight: bold;line-height: 36px}
    .class-con .bg-4m-t2{margin-bottom: 20px;font-size: 36px;line-height: 36px;margin-bottom: 30px}
    .class-con .bg-4m-img{height: 422px}
}

.bg_1 ul li>a:hover{color: #ff5a00!important;}