.title{
    margin-top: 40px;
}
.about{
    width: 100%;
    position: relative;
}
.about .about-engineering{
    width: 1200px;
    margin: 80px auto;
    display: flex;
}
.about .about-engineering .about-item{
    width: 25%;
    position: relative;
}
.about .about-engineering .about-item .about-item-num{
    font-weight: bold;
    font-size: 50px;
    color: #1562C5;
    line-height: 56px;
    text-align: center;
}
.about .about-engineering .about-item .about-item-name{
    font-size: 16px;
    color: #666666;
    line-height: 17px;
    text-align: center;
    margin-top: 20px;
}
.about .about-engineering .about-item::after{
    width: 2px;
    height: 30px;
    background: #1562C5;
    opacity: 0.2;
    content: "";
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
}
.about .about-engineering .about-item:last-child::after{
    content: none;
}

.about .about-img{
    width: 100%;
    aspect-ratio: 1920 / 240;

}
.about .about-img img{
    width: 100%;
    height: 100%;
}
.about .about-content{
    width: 1200px;
    margin: -100px auto 0;
    background: #FFFFFF;
    box-shadow: 0px 0px 6px 1px rgba(0,0,0,0.16);
    position: relative;
    z-index: 1;
    padding: 60px;
}
.about .about-content .about-title{
    font-weight: bold;
    font-size: 40px;
    color: #1A1A1A;
    line-height: 45px;
}
.about .about-content .about-desc{
    font-size: 14px;
    color: #666666;
    line-height: 21px;
    margin-top: 40px;
}



@media screen and (min-width: 1000px) and (max-width: 1440px) {
    .about .about-engineering{
        width: 900px;
        margin: 60px auto;
    }
    .about .about-engineering .about-item .about-item-num{
        font-size: 40px;
        line-height: 45px;
    }
    .about .about-engineering .about-item .about-item-name{
        font-size: 14px;
        line-height: 15px;
        margin-top: 15px;
    }
    .about .about-content{
        width: 900px;
        margin-top: -75px;
        padding: 40px;
    }
    .about .about-content .about-title{
        font-size: 30px;
        line-height: 33px;
    }
    .about .about-content .about-desc{
        font-size: 12px;
        line-height: 18px;
        margin-top: 30px;
    }
}

@media only screen and (max-width: 1000px) {
    .about .about-engineering{
        width: 700px;
        margin: 40px auto;
    }
    .about .about-engineering .about-item .about-item-num{
        font-size: 30px;
        line-height: 33px;
    }
    .about .about-engineering .about-item .about-item-name{
        font-size: 12px;
        line-height: 14px;
        margin-top: 10px;
    }
    .about .about-content{
        width: 700px;
        margin-top: -50px;
        padding: 20px;
    }
    .about .about-content .about-title{
        font-size: 24px;
        line-height: 27px;
    }
    .about .about-content .about-desc{
        font-size: 12px;
        line-height: 18px;
        margin-top: 20px;
    }
}

.cert{
    width: 1200px;
    margin: 80px auto;
}
.cert .cert-content{
    margin-top: 40px;
    display: flex;
    flex-wrap: wrap;
}
.cert .cert-content .cert-item{
    width: 24%;
    aspect-ratio: 278 / 392;
    margin-top: 30px;
    margin-right: 1.33%;
    overflow: hidden;
}
.cert .cert-content .cert-item:nth-child(-n+4){
    margin-top: 0;
}
.cert .cert-content .cert-item:nth-child(4n){
    margin-right: 0;
}
.cert .cert-content .cert-item img{
    width: 100%;
    height: 100%;
    transition: all 0.3s;
}
.cert .cert-content .cert-item:hover img{
    transform: scale(1.05);
}



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

.partner-wrap{
    width: 100%;
    background: #F8F8FA url("../images/about-bg.webp") no-repeat center bottom;
    padding: 80px 0 60px ;
}
.partner{
    width: 1200px;
    margin: 0 auto;
}
.partner .title{
    margin-top: 0;
}
.partner .partner-content{
    margin-top: 40px;
    display: flex;
    flex-wrap: wrap;
}
.partner .partner-content .partner-item{
    width: 20%;
    aspect-ratio: 2 / 1;
}
.partner .partner-content .partner-item img{
    width: 100%;
    height: 100%;
}

@media only screen and (min-width: 1000px) and (max-width: 1440px) {
    .partner-wrap{
        padding: 60px 0 50px;
        background-size: 900px;
    }
    .partner{
        width: 900px;
    }
    .partner .partner-content{
        margin-top: 30px;
    }
}
@media only screen and (max-width: 1000px) {
    .partner-wrap{
        padding: 40px 0 40px;
        background-size: 700px;
    }
    .partner{
        width: 700px;
    }
    .partner .partner-content{
        margin-top: 20px;
    }
}