.header{
    height: 80px;
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    z-index: 99;
    background: none;
    font-size: 14px;
    line-height: 80px;
}
.header.header_down {
    background: #fff;
    border-bottom: 1px solid #e0e0e0;
}
.header .logo_icon {
    width: 50px;
    height: 50px;
    vertical-align: middle;
}
.header .logo_text{
    font-size: 20px;
    color: #fff;
    font-weight: 900;
}
.header .hd_nav {
    margin-left: 20px;
}
.header .hd_nav .nav_item{
    display: inline-block;
    margin-left: 40px;
    font-size: 18px;
    
}
.header .hd_nav .nav_item .nav-link{
    color: #fff;
    position: relative;
    height: 100%;
    display: inline-block;
}

.header .hd_nav .nav_item .nav-link:hover{
    color: #fff;
}
.header .hd_nav .nav_item .nav-link:hover::after{
    position: absolute;
    left: 0;
    bottom: 0;
    content: '';
    width: 100%;
    height: 5px;
    background: #fff;
    border-radius: 8px;
}
.header .hd_nav .nav-slide {
    position: absolute;
    z-index: -1;
    left: 0;
    right: 0;
    top: 80px;
    background: #fff;
    overflow: hidden;
}

.header .hd_nav .ns-list {
    margin-top: -100%;
    opacity: 0;
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    transition: all 0.5s;
    -webkit-transition-timing-function: cubic-bezier(1,0,0,1);
    -moz-transition-timing-function: cubic-bezier(1,0,0,1);
    transition-timing-function: cubic-bezier(1,0,0,1);
}
.header .hd_nav .nav_item:hover .ns-list{
    margin-top: 0;
    opacity: 1;
}
.header .hd_nav .ns-list .dl-block {
    float: none;
    width: 100%;
    margin: 10px 0 30px 0;
}
.header .hd_nav .ns-list dt {
    font-size: 18px;
    line-height: 60px;
    border-bottom: 1px solid #DCDCDC;
    margin-bottom: 16px;
    margin-right: 30px;
}
.header .hd_nav .ns-list .dl-block dt {
    width: 190px;
}
.header .hd_nav .ns-list dd {
    line-height: 32px;
}
.header .hd_nav .ns-list .dl-block dd {
    overflow: hidden;
}
.header .hd_nav .ns-list .dl-block dd a {
    float: left;
    margin-right: 40px;
    padding: 10px 0;
}
.header .hd_nav .ns-list .dl-block dd a:hover {
    color: #007cc3;
}
.header .hd_nav .nav-slide .i-hot, .header .hd_nav .nav-slide .i-new {
    width: 40px;
    height: 19px;
    display: inline-block;
    vertical-align: sub;
    margin-left: 5px;
}
.header .hd_nav .nav-slide .i-hot {
    background: url(../images/menu-hot.gif) no-repeat;
}
.header .hd_nav .nav-slide .i-new {
    background: url(../images/menu-new.gif) no-repeat;
}