.header .header-nav .nav-item:nth-child(7)::after{
    content: "";
}
.header .header-nav .nav-item:nth-child(7)>a{
    color: #0070D9;
}
/***
 * about styles
 **/
.about{
    width: 100%;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
}
.about .about-left{
    width: calc(50% - 40px);
}
.about .about-left .site-title,
.about .about-left .title{
    text-align: left;
}
.about .about-left .title-line{
    margin: 0;
}
.about .about-left .about-desc{
    font-size: 16px;
    color: #666666;
    line-height: 24px;
    margin-top: 40px;
}
.about .about-left .about-more{
    width: 206px;
    height: 58px;
    background: #0070D9;
    display: block;
    font-size: 18px;
    color: #FFFFFF;
    line-height: 58px;
    text-align: center;
    margin-top: 40px;
}
.engineering{
    width: 100%;
    display: flex;
    margin-top: 40px;
}
.engineering .engineering-item{
    width: 33.33%;
    position: relative;
}
.engineering .engineering-item::after{
    content: "";
    width: 2px;
    height: 40px;
    background: #DBDBDB;
    opacity: 0.4;
    position: absolute;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
}
.engineering .engineering-item:last-child::after{
    content: none;
}
.engineering .engineering-item .engineering-item-num{
    font-family: DIN, DIN;
    font-weight: bold;
    font-size: 42px;
    color: #1A1A1A;
    line-height: 52px;
    text-align: center;
}
.engineering .engineering-item .engineering-item-name{
    font-size: 16px;
    color: #1A1A1A;
    line-height: 17px;
    text-align: center;
    margin-top: 10px;
}

.about .about-right{
    width: 50%;
}
.about .about-right .about-right-site-title{
    font-size: 14px;
    color: #1A1A1A;
    line-height: 16px;
}
.about .about-right .about-right-title{
    font-weight: bold;
    font-size: 46px;
    color: #1A1A1A;
    line-height: 69px;
    margin-top: 30px;
}
.about .about-right .about-right-img{
    width: 100%;
    margin-top: 40px;
}
.about .about-right .about-right-img img{
    width: 100%;
}


@media only screen and (min-width: 1000px) and (max-width: 1440px) {
    .about .about-left{
        width: calc(50% - 30px);
    }
    .about .about-left .about-desc{
        font-size: 14px;
        line-height: 21px;
        margin-top: 20px;
    }
    .about .about-left .about-more{
        width: 180px;
        height: 50px;
        font-size: 16px;
        line-height: 50px;
        margin-top: 20px;
    }
    .engineering{
        margin-top: 30px;
    }
    .engineering .engineering-item::after{
        height: 30px;
    }
    .engineering .engineering-item .engineering-item-num{
        font-size: 36px;
        line-height: 44px;
    }
    .engineering .engineering-item .engineering-item-name{
        font-size: 14px;
        line-height: 16px;
        margin-top: 6px;
    }

    .about .about-right{
        width: 50%;
    }
    .about .about-right .about-right-title{
        font-size: 38px;
        line-height: 50px;
        margin-top: 20px;
    }
}
@media only screen and (max-width: 1000px) {
    .about .about-left{
        width: calc(50% - 20px);
    }
    .about .about-left .about-desc{
        font-size: 12px;
        line-height: 18px;
        margin-top: 10px;
    }
    .about .about-left .about-more{
        width: 160px;
        height: 40px;
        font-size: 14px;
        line-height: 40px;
        margin-top: 10px;
    }
    .engineering{
        margin-top: 20px;
    }
    .engineering .engineering-item::after{
        height: 20px;
    }
    .engineering .engineering-item .engineering-item-num{
        font-size: 30px;
        line-height: 36px;
    }
    .engineering .engineering-item .engineering-item-name{
        font-size: 12px;
        line-height: 14px;
        margin-top: 0;
    }

    .about .about-right{
        width: 50%;
    }
    .about .about-right .about-right-title{
        font-size: 30px;
        line-height: 40px;
        margin-top: 20px;
    }
}


/**
 * certificate styles
 ***/
.certificate{
    width: 100%;
    margin: 60px auto;
}
.certificate .title{
    font-weight: bold;
    font-size: 36px;
    color: #1A1A1A;
    line-height: 41px;
}
.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{
        margin: 50px auto;
    }
    .certificate-list .certificate-item{
        margin-top: 30px;
    }
}
@media only screen and (max-width: 1000px) {
    .certificate{
        margin: 40px auto;
    }
    .certificate-list .certificate-item{
        margin-top: 20px;
    }
}


/**
 * brands styles
 **/
.brands{
    width: 100%;
    margin: 60px 0;
}
.brands .brands-content{
    width: 100%;
    margin: 30px auto;
    position: relative;
    overflow: hidden;
}
.brands .brands-content .brands-item{
    width: 100%;
    aspect-ratio: 720 / 540;
    background: #FFFFFF;
    overflow: hidden;
    cursor: pointer;
}
.brands .brands-content .brands-item img{
    width: 100%;
    height: 100%;
}
.brands .brands-content .brands-button-prev,
.brands .brands-content .brands-button-next{
    width: 60px;
    height: 60px;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1;
    cursor: pointer;
    background-size: 100% 100%;
}
.brands .brands-content .brands-button-prev::after,
.brands .brands-content .brands-button-next::after{
    content: none;
}
.brands .brands-content .brands-button-prev{
    left: 0;
    background-image: url("../images/prev-active.webp");
}
.brands .brands-content .brands-button-next{
    right: 0;
    background-image: url("../images/next-active.webp");
}

@media only screen and (min-width: 1000px) and (max-width: 1440px) {
    .brands .brands-content{
        margin: 50px auto;
    }
    .brands .brands-content .brands-button-prev, .brands .brands-content .brands-button-next{
        width: 50px;
        height: 50px;
    }
}
@media only screen and (max-width: 1000px) {
    .brands .brands-content{
        margin: 40px auto;
    }
    .brands .brands-content .brands-button-prev, .brands .brands-content .brands-button-next{
        width: 40px;
        height: 40px;
    }
}