.header{
    height: 60px;
    line-height: 60px;
    position: fixed;
    top:0;
    left: 0;
    z-index: 999;
    width: 100%;
    /*background: #4d4d4d;*/
    background: transparent;
}
.icon-logo{
    background-image: url("../../images/index/logo.png");
    width: 316px;
    height: 60px;
    background-position: center;
    background-repeat: no-repeat;
    -webkit-background-size:316px 44px;
    background-size:316px 44px;
    background-color: transparent;
    margin-left:30px;
    float: left;
}
.case .banner{
    background-image: url("../../images/index/casebanner2.png");
    background-size: 100%;
    background-repeat: no-repeat;
    width: 100%;
    height: 602px;
}
.content{
    max-width: 1600px;
    width: 1280px;
    margin: 0 auto;
    height: 100%;
    position: relative;
    margin-top: 60px;
}
.case .p-1{
    text-align: center;
    font-size: 30px;
    color: #252525;
    margin-bottom: 30px;
}
.case-nav ul{
    width: 59%;
    margin: 0 auto;
    list-style: none;
    margin-bottom: 30px;
}
.case-nav ul li{
    float: left;
    font-size: 20px;
    color: #222222;
    height: 30px;
    line-height: 30px;
    padding-bottom: 19px;
    text-align: center;
    margin-bottom: 26px;
}
.case-nav ul li:hover{
    cursor: pointer;
}
.case-nav .active{
    color: #2d8cfb;
    border-bottom:1px solid #2d8cfb;
}
.nav {
    display: inline-block;
    position: relative;
    left:50%;
    margin-left: -478px;
    width: 1000px;
}
.nav img {
    width: 315px;
    margin-bottom: 20px;
    margin-left: 12px;
}
.nav .unknow{
    width: 315px;
    height: 223px;
    display: inline-block;
}