.slide-nav .slide-sub{
    height: 0;
    z-index: 1;
    -webkit-transition: .4s;
    -o-transition: .4s;
    transition: .4s;
}
.header .nav-list>li:hover .slide-sub{
    height: 500px;
}
.header .nav-list>li:hover .product-sub{
    height: 500px;
}
.header .nav-list>li:hover .solution-sub{
    height: 500px;
}
.header .nav-list>li:hover .case-sub{
    /* height: 61px; */
    height: 500px;
}
.header .nav-list>li:hover .about-sub{
    height: 500px;
}
.slide-nav .slide-sub{
    position: absolute;
    left: 0;
    /* right: 0; */
    width: 100%;
    overflow: hidden;
    background-color: #fff;
}
.slide-nav .nav-item{
    float: left;
}
.slide-nav .product-sub .nav-item{
    width: 30%;
    margin: 0 1.6%;
}
.slide-nav .solution-sub .nav-item{
    width: 46.8%;
    margin: 0 1.6%;
}
.slide-nav .case-sub .nav-item{
    width: 30%;
    margin: 0 1.6%;
}
.slide-nav .about-sub .nav-item{
    width: 22.5%;
    margin: 0 1.6%;
}
.slide-nav .about-sub .nav-item:first-child{
    width: 45%;
}
.slide-nav .case-sub .nav-item .nav-tit{
    border-bottom: none;
}
.slide-nav .nav-item .nav-tit{
    font-size: 18px;
    font-weight: 600;
    line-height: 60px;
    border-bottom: 1px solid #d4d4d4;
}
.slide-nav .nav-container{
    width: 1200px;
    box-sizing: border-box;
    padding: 0 30px;
    margin: 0 auto;
}
.slide-nav .nav-content{
    width: 100%;
    overflow: hidden;
}
.slide-nav .product-sub .nav-content ul{
    width: 100%;
}
.slide-nav .solution-sub .nav-content ul{
    width: 50%;
    float: left;
}
.slide-nav .about-sub .nav-item:first-child .nav-content ul{
    width: 50%;
    float: left;
}
.slide-nav .about-sub .nav-content ul{
    width: 100%;
    float: left;
}
.slide-nav .nav-content ul{
    display: block;
    float: left; 
}
.header .slide-nav .nav-content ul li{
    display: block;
    float: none;
    margin: 0;
    height: 48px;
    line-height: 48px;
    font-size: 14px;
    text-align: left;
}
.slide-nav .nav-content ul li a{
    display: inline-block;
    height: 48px;
    line-height: 48px;
    cursor: pointer;
}
.header .slide-nav .nav-content li>a:before{
    display: none;
}