body{
    background: #fafafa;
}
.j-banner{
    width: 100%;
    height: 388px;
    background: url("../img/gy_banner.png") no-repeat top center;
    background-size: cover;
    display: flex;
    align-items: center;
    justify-content: center;
}
.j-banner-son h3{
    color: #ffffff;
    font-size: 36px;
    position: relative;
    display: inline-block;
    text-transform: uppercase;
}
.j-banner-son h3:before{
    content: '';
    position: absolute;
    width: 37px;
    height: 2px;
    background: #fff;
    left: -40px;
    top:50%;
    margin-top: -1px;
    z-index: 4;
}
.j-banner-son h3:after{
    content: '';
    position: absolute;
    width: 37px;
    height: 2px;
    background: #fff;
    right: -40px;
    top:50%;
    margin-top: -1px;
    z-index: 4;
}
.j-banner-son h4{
    color: #ffffff;
    font-size: 18px;
    text-align: center;
    margin-top: 5px;
}
.j-title{
    margin: 40px 0;
    text-align: center;
}
.j-title h3{
    color: #333333;
    font-size: 30px;
}
.j-title h4{
    color: #666666;
    font-size: 12px;
    text-transform: uppercase;
    margin-top: 5px;
}
.j-product{
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: space-between;
}
.about-item{
    width: 603px;
    height: 524px;
    background: #ffffff;
    border:1px solid #f4f4f4;
    margin-bottom: 50px;
}
.about-item-img{
    width: 100%;
    height: 355px;
    position: relative;
}
.about-cover{
    width: 100%;
    opacity: 0;
    height: 100%;
    background: rgba(0,0,0,.58);
    position: absolute;
    left: 0;
    top:0;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}
.about-item-img > img{
    width: 100%;
    height: 100%;
}
.about-item-bt{
    padding: 15px;
}
.about-item-bt h3{
    color: #333333;
    font-size: 22px;
    line-height: 45px;
}
.about-box{
    display: flex;
    align-items: center;
}
.about-text{
    width: 80%;
    color: #666;
    font-size: 14px;
    line-height: 22px;
    -webkit-line-clamp:3;
    overflow: hidden;
    text-overflow: ellipsis;
    display: box;
    display: -webkit-box;
    line-clamp: 3;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}
.about-link{
display: block;
    width: 68px;
    height: 68px;
    text-align: center;
    line-height: 68px;
    margin-left: 20px;
    border-radius: 50%;
}
.about-link img{
    vertical-align: middle;
}
.about-item:hover .about-item-bt{
    background: #28ba0b;
}
.about-item:hover .about-item-bt h3,.about-item:hover .about-item-bt .about-text{
    color: #ffffff;
}
.about-item:hover .about-item-bt .about-link{
    background: #ffffff;
}
.about-item:hover .about-cover{
    opacity: 1;
}
@media screen and (max-width: 1300px) {
    .about-item{
        width: 49%;
    }
}
@media screen and (max-width: 768px) {
    .j-banner{
        margin-top: 83px;
        height: 274px;
    }
    .about-item{
        width: 90%;
        margin: 0px auto;
        height: auto;
    }
    .about-cover{
        display: none;
    }
    .about-item-img{
        height: 270px;
    }
    .about-item-bt h3{
        font-size: 18px;
    }
}