@media screen and (min-width: 1300px) {
    .top_banner{
        height: 480px;
        width: 100%;
        background: url(../../images/product.png) no-repeat center 80px;
        background-size: auto 400px;
    }
}

@media screen and (max-width: 1300px) {
    .top_banner{
        height: 360px;
        width: 100%;
        background: url(../../images/product.png) no-repeat center 80px;
        background-size: 1500px 300px;
    }
}

.container{
    width: 100%;
    background: url(../../images/bg.png) repeat center;
}

.case_list{
    width: 1200px;
    margin: 0px auto;
    padding: 100px 0px;
}

.case_list li{
    display: block;
    float: left;
    width: 386px;
    margin: 0 20px 20px 0;
    background: #fff;
}
.case_list ul li .pic {
    width: 386px;
    height: 250px;
    margin-bottom: 12px;
    overflow: hidden;
}

.case_list ul li .pic img {
    width: 100%;
    vertical-align: middle;
    height: 250px;
}

.case_desc {
    padding: 0 15px 25px 15px;
}

.case_list ul li .case_title {
    font-size: 18px;
    height: 30px;
    line-height: 30px;
    width: 90%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 500;
    color: #333;
}

.case_list ul li span {
    font-size: 12px;
    color: #999;
    display: block;
    line-height: 25px;
    border-bottom: 1px solid #eee;
    margin-bottom: 10px;
    padding-bottom: 5px;
}


.case_list ul li p {
    font-size: 14px;
    line-height: 25px;
    color: #999;
    margin-bottom: 15px;
    height: 50px;
    overflow: hidden;
}