/***
 * about styles
 **/
.about{
    margin-top: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.about .about-img{
    width: 50%;
    aspect-ratio: 600/337;
}
.about .about-img img{
    width: 100%;
    height: 100%;
}
.about .about-description{
    width: 48%;
    font-size: 14px;
    color: #333333;
    line-height: 24px;
}


@media only screen and (min-width: 1000px) and (max-width: 1440px) {

}
@media only screen and (max-width: 1000px) {

}



/**
* choose  styles
***/
.choose{
    margin: 80px auto;
}
.choose .choose-list{
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
}
.choose .choose-list .choose-item{
    width: 380px;
    height: 189px;
    background-color: #FFFFFF;
    margin-top: 30px;
    cursor: pointer;
    padding: 30px 20px;
    border: 1px solid #D6D6D6;
}
.choose .choose-list .choose-item .choose-item-icon{
    width: 58px;
    height: 58px;
    overflow: hidden;
    float: left;
}
.choose .choose-list .choose-item .choose-item-icon img{
    width: 100%;
    height: 100%;
}
.choose .choose-list .choose-item .choose-item-icon img.active{
    display: none;
}
.choose .choose-list .choose-item .choose-item-text{
    width: 260px;
    margin-left: 20px;
    float: left;
}
.choose .choose-list .choose-item .choose-item-title{
    font-weight: bold;
    font-size: 16px;
    color: #333333;
    line-height: 16px;
}
.choose .choose-list .choose-item .choose-item-desc{
    font-size: 14px;
    color: #666666;
    line-height: 24px;
    margin-top: 16px;
}
.choose .choose-list .choose-item:hover .choose-item-icon img.normal {
    display: none;
}
.choose .choose-list .choose-item:hover .choose-item-icon img.active {
    display: inline-block;
}


@media only screen and (min-width: 1000px) and (max-width: 1440px) {
    .choose{
        margin: 60px auto;
    }
    .choose .choose-list .choose-item{
        width: 285px;
        height: 150px;
        padding: 10px;
    }
    .choose .choose-list .choose-item .choose-item-icon{
        width: 40px;
        height: 40px;
    }
    .choose .choose-list .choose-item .choose-item-text{
        width: 208px;
        margin-left: 15px;
    }
    .choose .choose-list .choose-item .choose-item-desc{
        line-height: 20px;
        margin-top: 10px;
    }
}
@media only screen and (max-width: 1000px) {
    .choose{
        margin: 40px auto;
    }
    .choose .choose-list .choose-item{
        width: 48%;
        height: 125px;
        padding: 10px;
    }
    .choose .choose-list .choose-item{
        margin-top: 10px;
    }
    .choose .choose-list .choose-item .choose-item-icon{
        width: 50px;
        height: 50px;
    }
    .choose .choose-list .choose-item .choose-item-text{
        width: 249px;
        margin-left: 15px;
    }
    .choose .choose-list .choose-item .choose-item-desc{
        line-height: 20px;
        margin-top: 10px;
    }
}


/**
 * brands styles
 ***/
.brands{
    width: 100%;
    position: relative;
}
.brands .brand-list{
    width: 1200px;
    margin: 0 auto;
    display: flex;
}
.brands .brand-list .brand-item{
    width: 20%;
    aspect-ratio: 240/120;
    cursor: pointer;
}
.brands .brand-list .brand-item img{
    width: 100%;
    height: 100%;
}
.brands .brand-bg{
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 50px;
    background: #000000;
    z-index: -1;
}

@media only screen and (min-width: 1000px) and (max-width: 1440px) {
    .brands .brand-list{
        width: 900px;
    }
}
@media only screen and (max-width: 1000px) {
    .brands .brand-list{
        width: 700px;
    }
    .brands .brand-bg{
        height: 30px;
    }
}


/**
 * about  styles
 **/
.video-wrap{
    width: 100%;
    height: 600px;
    padding-top: 80px;
    background: #000000;
}
.video{
    width: 1200px;
    height: 100%;
    margin: 0 auto;
    position: relative;
}
.video .video-text{
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
    font-weight: bold;
    font-size: 50px;
    color: #FFFFFF;
    line-height: 75px;
}
.video .video-content{
    width: 870px;
    height: 520px;
    position: absolute;
    right: 0;
    top: 0;
    z-index: 1;
}
.video .video-content video{
    width: 100%;
    height: 100%;
}

@media only screen and (min-width: 1000px) and (max-width: 1440px) {
    .video-wrap{
        height: 450px;
        padding-top: 60px;
    }
    .video{
        width: 900px;
    }
    .video .video-text{
        font-size: 40px;
        line-height: 60px;
    }
    .video .video-content{
        width: 652px;
        height: 390px;
        right: calc(50% - 450px);
    }
}
@media only screen and (max-width: 1000px) {
    .video-wrap{
        height: 350px;
        padding-top: 40px;
    }
    .video{
        width: 700px;
    }
    .video .video-text{
        font-size: 30px;
        line-height: 45px;
    }
    .video .video-content{
        width: 508px;
        height: 303px;
        right: calc(50% - 350px);
    }
}

/**
 * certificate styles
 ***/
.certificate{
    width: 100%;
    position: relative;
    padding-top: 80px;
    margin-bottom: 80px;
}
.certificate .certificate_bg{
    width: 100%;
    height: 300px;
    background: #000000;
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
}
.certificate .title{
    width: 1200px;
    margin: 0 auto;
    font-weight: bold;
    font-size: 40px;
    color: #FFFFFF;
    line-height: 52px;
}
.certificate .certificate-list{
    width: 1200px;
    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{
        padding-top: 60px;
        margin-bottom: 60px;
    }
    .certificate .title,
    .certificate .certificate-list{
        width: 900px;
    }
}
@media only screen and (max-width: 1000px) {
    .certificate{
        padding-top: 40px;
        margin-bottom: 40px;
    }
    .certificate .title,
    .certificate .certificate-list{
        width: 700px;
    }
    .certificate .certificate_bg{
        height: 240px;
    }
}