.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 .history{
    display: flex;
    margin-bottom: 1rem;
}
main .history>div{
    width: 50%;
}
main .history .right{
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0.3rem;
}
main .history .right .title{
    max-width: 670px;
    width: 100%;
    margin-bottom: 0;
}
main .history .right .title h2{
    font-size: 0.4rem;
}
main .history .right .title p{
    margin-bottom: 0;
    text-align: left;
    font-size: 16px;
    color: #888;
    margin-top: 0.15rem;
}
main .history:nth-child(odd){
    flex-direction: row-reverse;
}
main .history:nth-child(odd) .right{
    background-color: #EAEAEA;
}

main .production .title{
    align-items: center;
}
main .production .swiper{
    position: relative;
    margin-bottom: 0.5rem;
}
main .production .swiper .swiper-slide img{
    width: 100%;
}
.swiper-button-next-production{
    right: -5%;
}
.swiper-button-prev-production{
    left: -5%;
}
.swiper-button-next-production::after, .swiper-button-prev-production::after{
    font-size: 30px;
    color: #0F4E48;
}

 main .product_bg{
    overflow: hidden;
    background: url(/lib/images/about/product_bg.png);
    background-repeat: no-repeat;
    background-size: cover;
    margin-bottom: 1rem;
 }
 main .product_bg .product_top{
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 0.5rem;
 }

 main .product_bg .product_top .title{
    margin: 0;
    max-width: 1120px;
    margin-right: 0.3rem;
 }
 main .product_bg .product_top .title p{
    text-align: left;
    font-size: 16px;
    color: #888;
 }
 main .product_bg .product_top .btn{
    width: 140px;
    height: 66px;
    position: relative;
 }
 main .product_bg .swiper-product{
    overflow: inherit;
    margin-bottom: 1rem;
 }
 .swiper-button-next-product, .swiper-button-prev-product{
    width: 66px;
    height: 66px;
    top: 0;
    margin-top: 0;
 }
 .swiper-button-next-product::after, .swiper-button-prev-product::after{
    font-size: 30px;
    font-weight: bold;
 }
 .swiper-button-next-product{
    background-color: #0F4E48;
    color: #fff;
    right: 0;
 }
 .swiper-button-prev-product{
    background-color: #EAEAEA;
    color: #0F4E48;
    left: 0;
 }

main .certificate{
    display: flex;
}
main .certificate>div{
    width: 50%;
}
main .certificate .left .swiper-slide>img{
    width: 100%;
}
main .certificate .left .mask{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    content: '';
    background-color: rgba(18, 18, 18,0.3);
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0.3rem;
}
main .certificate .left .mask .txt{
    max-width: 670px;
    width: 100%;
}
main .certificate .left .mask .txt *{
    color: #fff;
}
main .certificate .left .mask .txt p{
    font-size: 16px;
    text-align: left;
    margin-top: 0.2rem;
}
main .certificate .left .swiper .btn{
    position: absolute;
    right: 20px;
    bottom: 20px;
    width: 140px;
    height: 66px;
}
.swiper-button-next-certificate, .swiper-button-prev-certificate{
    width: 66px;
    height: 66px;
    background-color: #fff;
    top: 0;
    margin-top: 0;
}
.swiper-button-next.swiper-button-disabled, .swiper-button-prev.swiper-button-disabled{
    opacity: 1;
}
.swiper-button-next-certificate{
    right: 0;
}
.swiper-button-prev-certificate{
    left: 0;
}
.swiper-button-next-certificate::after, .swiper-button-prev-certificate::after{
    font-size: 30px;
    color: #0F4E48;
}
main .certificate .right{
    padding: 0.3rem 1.2rem;
}
main .certificate .right .txt_over{
    max-height: 300px;
    overflow-y: auto;
}
main .certificate .right h2{
    font-size: 0.4rem;
}
main .certificate .right p{
    font-size: 16px;
    color: #888;
    margin-top: 0.2rem;
}
main .certificate .right ul{
    display: flex;
    justify-content: space-between;
    margin-top: 0.4rem;
    flex-wrap: wrap;
}

main .service{
    display: flex;
}
main .service>div{
    width: 50%;
}
main .service .left{
    background-color: #EAEAEA;
    padding: 30px 15px;
}
main .service .left .title{
   max-width: 500px;
   align-items: center;
   margin: 0;
   margin-top: 0.2rem;
}
main .service .left .title p{
    font-size: 16px;
    color: #888;
}
main .service .right{
    position: relative;
}
main .service .right>img{
    width: 100%;
}
main .service .right .mask{
    background-color: #fff;
    max-width: 860px;
    width: 100%;
    padding: 0.5rem;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: -1.1rem;
}
main .service .right .mask .box{
    display: flex;
    align-items: center;
    margin-bottom: 0.4rem;
}
main .service .right .mask .box p{
    margin-left: 20px;
}
main .service .right .mask .box:last-child{
    margin-bottom: 0;
}

.keywords{
    margin-bottom: 1rem;
 }
 .keywords .line{
     width: 100%;
     height: 1px;
     background-color: #EAEAEA;
     margin-bottom: 1rem;
 }
 .keywords .title{
     align-items: center;
 }
 .keywords ul{
     display: flex;
     justify-content: center;
     flex-wrap: wrap;
 }
 .keywords ul li{
     margin: .1rem;
 }
 .keywords ul li a{
     display: flex;
     padding: 10px 30px;
     border-radius: 20px;
     border: 1px solid #E5E5E5;
 }

 main .video{
    margin-bottom: 1rem;
 }
main .video .content{
    max-width: 1344px;
}
main .video .content iframe{
    margin: 0 auto;

}








 @media (max-width:1440px) {
    
 }
 @media (max-width:1279px) {
    
    main .banner .mask .txt{
        max-width: 50%;
    }
    .swiper-button-next-production{
        right: 0;
        display: none;
    }
    .swiper-button-prev-production{
        left: 0;
        display: none;
    }
    main .certificate{
        flex-direction: column;
    }
    main .certificate>div{
        width: 100%;
    }
    main .service{
        flex-direction: column;
    }
    main .service>div{
        width: 100%;
    }
    main .service .right .mask{
        left: 50%;
        transform: translate(-50%,-50%);
        width: 80%;
    }
 }

 @media (max-width:1023px) {
    main .history{
        flex-direction: column;
    }
    main .history>div{
        width: 100%;
    }
    main .history:nth-child(odd){
        flex-direction: column;
    }

 }

 @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;
    }
    main .product_bg .product_top{
        flex-direction: column;

    }
    .swiper-button-next-product::after, .swiper-button-prev-product::after{
        font-size: 30px;
    }
    .swiper-button-next-certificate::after, .swiper-button-prev-certificate::after{
        font-size: 16px;
    }
    main .certificate .left .swiper-slide>img{
        height: 250px;
        object-fit: cover;
    }
    main .certificate .left .swiper-slide>img{
        position: absolute;
        width: 100%;
        height: 100%;
        top: 0;
        left: 0;
    }
    main .certificate .left .mask{
        position: relative;
    }
    main .certificate .left .mask .txt{
        margin-bottom: 80px;
    }
    main .certificate .left .mask .txt p{
        line-height: 1.8;
    }
    main .certificate .right{
        padding: 0.3rem 15px;
    }
    main .certificate .right ul li{
        max-width: 100px;
    }
    main .service .right .mask{
        position: inherit;
    }
    main .service .right .mask{
        transform: translate(-50%,-10%);
        width: 95%;
    }
    main .video .content iframe{
        height: 280px;
    }
    main .history .right{
        padding-bottom: 0;
    }
 }