.header_main{
    background-color: #fff;
    box-shadow: 0 0 5px rgba(0, 0, 0,0.1);
}
.zt{
    width: 100%;
    height: 2.1rem;
}
main .banner{
    position: relative;
}
main .banner .mask{
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    content: '';
    background-color: rgba(0, 0,0,0.3);
}
main .banner .mask .txt{
    max-width: 760px;
    width: 100%;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 10%;
}
main .banner .mask .txt *{
    color: #fff;
}
main .banner .mask .txt p{
    font-size: 16px;
    color: #E5E5E5;
}
main .banner .mask .txt h3{
    font-size: 0.4rem;
}
main .banner .mask .txt .line{
    width: 32px;
    height: 4px;
    background-color: #fff;
    margin-top: 0.8rem;
    margin-bottom: 0.2rem;
}   
main .banner .mask .txt .btn{
    position: relative;
    margin-top: 0.4rem;
    height: 0.66rem;
}

main .video .title{
    margin-top: 0.5rem;
    align-items: center;
}
main .video .title p{
    font-size: 14px;
    color: #888;
    line-height: 1.8;
}
main .video .lsit ul{
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 0.8rem;
}
main .video .lsit ul li{
    width: 220px;
    height: .48rem;
    text-align: center;
    line-height: .48rem;
    font-size: 16px;
    background-color: #EAEAEA;
    margin-right: 0.4rem;
    margin-bottom: 20px;
    cursor: pointer;
}
main .video .lsit ul li.active{
    background-color: #18554F;
    color: #fff;
}
main .video .lsit ul li:hover{
    background-color: #18554F;
    color: #fff;
}

.video .list_top{
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 0.5rem;
}

.video .list_top h2{
    font-size: 0.28rem;
}
.video .list_top .sraech{
    position: relative;
}
.video .list_top .sraech .input{
    width: 320px;
    height: 48px;
    border: 1px solid #E5E5E5;
    border-radius: 4px;
}
.video .list_top .sraech .submit{
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    right: 20px;
}
.video .list_top .sraech .submit input{
    width: 20px;
    height: 20px;
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0;
}
.video .video_in .cart{
    margin-bottom: 0.4rem;
}
.video .video_in .cart .img{
    overflow: hidden;
    position: relative;
}
.video .video_in .cart .img iframe{
    width: 100%;
    height: 270px;
}
.video .video_in .cart .img .mask{
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    cursor: pointer;
}
.video .video_in .cart .img>img{
    width: 100%;
    transition: all 0.5s;
}
.video .video_in .cart:hover .img>img{
    transform: scale(1.1);
}
.video .video_in .cart .txt{
    padding: 0.3rem 0.2rem;
    border-left: 1px solid #e5e5e5;
}
.video .video_in .cart h3{
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
    overflow: hidden;
}
.video .video_in .cart p{
    font-size: 14px;
    color: #888;
}

.page{
    margin-bottom: 1rem;
}



 @media (max-width:1440px) {
    
 }
 @media (max-width:1279px) {
    
    main .banner .mask .txt{
        max-width: 50%;
    }
 }

 @media (max-width:767px) {
    main .banner img{
        width: 100%;
        object-fit: cover;
        height: 350px;
    }
    main .banner .mask .txt{
        max-width: 100%;
        padding: 0 15px;
        left: 0;
    }
    .video .list_top{
        margin-top: 0.2rem;
        flex-direction: column;
        align-items: flex-start;
    }
    main .video .lsit ul li{
        font-size: 14px;
        margin-right: 10px;
        margin-bottom: 10px;
        width: 45%;
        height: 26px;
        line-height: 26px;
    }
    .video .list_top h2{
        font-size: 0.3rem;
        margin-bottom: 10px;
    }
    .video .video_in .row{
        margin-left: -15px;
        margin-right: -15px;
    }
    .video .video_in .row .col-md-3{
        padding-left: 15px;
        padding-right: 15px;
    }
 }