.index-title{
    font-size: 16px;
    color: #E60012;
    line-height: 18px;
    position: relative;
    padding-left: 40px;
}
.index-title::after{
    content: "";
    width: 30px;
    height: 2px;
    background: #E60012;
    position: absolute;
    top: 8px;
    left: 0;
}
.about{
    width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.about .about-left{
    width: 50%;
}
.about .about-title{
    font-weight: bold;
    font-size: 50px;
    color: #1A1A1A;
    line-height: 60px;
    margin-top: 30px;
}
.about .about-desc{
    font-size: 16px;
    color: #666666;
    line-height: 24px;
    margin-top: 30px;
}
.about .about-right{
    width: 48%;
}
.about .about-right .about-right-wrap{
    width: calc( 100% - 30px );
    aspect-ratio: 540 / 520;
    border: 1px solid #B4B4B4;
    position: relative;
}
.about .about-right .about-right-wrap::after{
    content: "";
    width: 100%;
    height: 115px;
    position: absolute;
    bottom: 0;
    left: 0;
    background: #E60012;
}
.about .about-video-wrap{
    width: 100%;
    position: absolute;
    top: 30px;
    left: -30px;
    aspect-ratio: 540 / 460;
    z-index: 1;
}
.about .about-video-wrap .about-img{
    width: 100%;
    position: relative;
}
.about .about-video-wrap .about-img img{
    width: 100%;
    height: 100%;
}
.about .about-video-wrap .about-img .about-img-icon{
    width: 46px;
    height: 46px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    cursor: pointer;
}
.about .about-video-wrap .about-img .about-img-icon img{
    width: 46px;
    height: 46px;
}
.about .about-video-wrap .about-img .about-img-icon .about-img-icon-text{
    font-size: 12px;
    color: #FFFFFF;
    line-height: 18px;
    text-align: center;
    margin-top: 22px;
}
.about .about-video-wrap .about-video{
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 2;
    background-color: #E6E6E6;
    display: none;
}
.about .about-video-wrap .about-video video{
    width: 100%;
    height: 100%;
}

.about-engineering{
    width: 1200px;
    margin: 80px auto;
    display: flex;
    justify-content: space-between;
}
.about-engineering .about-engineering-item{
    width: 24%;
    position: relative;
    z-index: 1;
    padding: 30px 20px 0 30px;
    cursor: pointer;
}
.about-engineering .about-engineering-item .about-engineering-item-img{
    width: 60px;
    height: 60px;
}
.about-engineering .about-engineering-item .about-engineering-item-img img{
    width: 100%;
    height: 100%;
    transition: all 0.5s;
}
.about-engineering .about-engineering-item .about-engineering-item-num{
    font-weight: bold;
    font-size: 50px;
    color: #1A1A1A;
    line-height: 56px;
    text-align: right;
    margin-top: 40px;
}
.about-engineering .about-engineering-item .about-engineering-item-title{
    font-size: 18px;
    color: #666666;
    line-height: 20px;
    text-align: right;
    margin-top: 10px;
}
.about-engineering .about-engineering-item .about-engineering-item-bg{
    width: 100%;
    height: 160px;
    position: absolute;
    top: 0;
    left: 0;
    background: #EFEFEF;
    z-index: -1;
}
.about-engineering .about-engineering-item:hover .about-engineering-item-img img{
    transform: rotateY(180deg);
}



@media only screen and (min-width: 1000px) and (max-width: 1440px) {
    .about{
        width: 900px;
    }
    .about .about-title{
        margin-top: 20px;
        font-size: 36px;
        line-height: 44px;
    }
    .about .about-desc{
        font-size: 14px;
        line-height: 21px;
        margin-top: 20px;
    }
    .about .about-more{
        margin-top: 40px;
    }
    .about .about-video-wrap{
        top: 20px;
        left: -20px;
    }
    .about-engineering{
        width: 900px;
        margin-top: 60px;
    }
    .about-engineering .about-engineering-item{
        padding: 20px 15px 0 20px;
    }
    .about-engineering .about-engineering-item .about-engineering-item-img{
        width: 50px;
        height: 50px;
    }
    .about-engineering .about-engineering-item .about-engineering-item-num{
        font-size: 36px;
        line-height: 46px;
        margin-top: 30px;
    }
    .about-engineering .about-engineering-item .about-engineering-item-title{
        font-size: 14px;
        margin-top: 5px;
    }
    .about-engineering .about-engineering-item .about-engineering-item-bg{
        height: 123px;
    }
}
@media only screen and (max-width: 1000px) {
    .about{
        width: 700px;
    }
    .about .about-title{
        margin-top: 10px;
        font-size: 26px;
        line-height: 30px;
    }
    .about .about-desc{
        font-size: 12px;
        line-height: 18px;
        margin-top: 10px;
    }
    .about .about-more{
        width: 120px;
        height: 40px;
        margin-top: 20px;
    }
    .about .about-more a{
        font-size: 14px;
        line-height: 40px;
    }
    .about .about-more a img{
        margin-left: 5px;
    }
    .about .about-video-wrap{
        top: 20px;
        left: -20px;
    }
    .about-engineering{
        width: 700px;
        margin-top: 40px;
    }
    .about-engineering .about-engineering-item{
        padding: 15px 10px 0 15px;
    }
    .about-engineering .about-engineering-item .about-engineering-item-img{
        width: 40px;
        height: 40px;
    }
    .about-engineering .about-engineering-item .about-engineering-item-num{
        font-size: 26px;
        line-height: 36px;
        margin-top: 20px;
    }
    .about-engineering .about-engineering-item .about-engineering-item-title{
        font-size: 12px;
        margin-top: 0;
    }
    .about-engineering .about-engineering-item .about-engineering-item-bg{
        height: 93px;
    }
}


.production-wrap{
    width: 100%;
    aspect-ratio: 1920 / 800;
    background-size: cover;
    padding-top: 80px;
}
.production{
    width: 1200px;
    height: 100%;
    margin: 0 auto;
    position: relative;
}
.production .production-title{
    font-weight: bold;
    font-size: 50px;
    color: #FFFFFF;
    line-height: 60px;
    margin-top: 30px;
}
.production .production-content{
    width: 532px;
    position: absolute;
    bottom: 80px;
    right: 0;
}
.production .production-content .production-desc{
    font-size: 16px;
    color: #FFFFFF;
    line-height: 24px;
}
.production .production-content .production-more{
    border-top: 1px solid #FFFFFF;
    border-bottom: 1px solid #FFFFFF;
    margin-top: 30px;
}
.production .production-content .production-more a{
    display: flex;
    line-height: 57px;
    justify-content: space-between;
    align-items: center;
    color: #FFFFFF;
}
.production .production-content .production-more a img{
    width: 14px;
    height: 16px;
}


@media only screen and (min-width: 1000px) and (max-width: 1440px) {
    .production-wrap{
        padding-top: 60px;
    }
    .production{
        width: 900px;
    }
    .production .production-title{
        font-size: 36px;
        line-height: 44px;
        margin-top: 20px;
    }
    .production .production-content{
        bottom: 60px;
    }
    .production .production-content .production-desc{
        font-size: 14px;
        line-height: 21px;
    }
    .production .production-content .production-more{
        margin-top: 20px;
    }
    .production .production-content .production-more a{
        line-height: 50px;
    }
}
@media only screen and (max-width: 1000px) {
    .production-wrap{
        padding-top: 40px;
    }
    .production{
        width: 700px;
    }
    .production .production-title{
        font-size: 26px;
        line-height: 34px;
        margin-top: 10px;
    }
    .production .production-content{
        bottom: 40px;
    }
    .production .production-content .production-desc{
        font-size: 12px;
        line-height: 18px;
    }
    .production .production-content .production-more{
        margin-top: 10px;
    }
    .production .production-content .production-more a{
        line-height: 40px;
    }
}

/**
 * certificate styles
 ***/
.certificate{
    width: 1200px;
    margin: 80px auto;
}
.certificate .certificate-list{
    margin: 0 auto;
    position: relative;
    display: flex;
    flex-wrap: wrap;
}
.certificate-list .certificate-item{
    width: 24%;
    margin-right: 1.33%;
    margin-top: 40px;
}
.certificate-list .certificate-item:nth-child(4n){
    margin-right: 0;
}
.certificate-list .certificate-item img{
    width: 100%;
}


@media only screen and (min-width: 1000px) and (max-width: 1440px) {
    .certificate{
        width: 900px;
        margin: 60px auto;
    }
    .certificate-list .certificate-item{
        margin-top: 30px;
    }
}
@media only screen and (max-width: 1000px) {
    .certificate{
        width: 700px;
        margin: 40px auto;
    }
    .certificate-list .certificate-item{
        margin-top: 20px;
    }
}


/**
 * brands styles
 **/
.brands{
    width: 100%;
    border-top: 1px solid #CCCCCC;
}
.brands .brands-content{
    width: 1200px;
    margin: 0 auto;
}
.brands .brands-content .brands-list{
}
.brands .brands-content .brands-list .brands-item{
    width: 20%;
    aspect-ratio: 240 / 120;
    background: #FFFFFF;
    float: left;
    overflow: hidden;
    cursor: pointer;
}
.brands .brands-content .brands-list .brands-item img{
    width: 100%;
    height: 100%;
    transition: all .5s;
}
.brands .brands-content .brands-list .brands-item:hover img{
    transform: scale(1.1);
}


@media only screen and (min-width: 1000px) and (max-width: 1440px) {
    .brands .brands-content{
        width: 900px;
    }
}
@media only screen and (max-width: 1000px) {
    .brands .brands-content{
        width: 700px;
    }
}