arset "utf-8";
/* 头部logo + 头部导航 */
    .ph-header {
        -webkit-box-shadow: 0 1px 10px rgba(0, 0, 0, 0.2);
        -moz-box-shadow: 0 1px 10px rgba(0, 0, 0, 0.2);
        box-shadow: 0 1px 10px rgba(0, 0, 0, 0.2);
    }
    .headertop {
        z-index: 3;
    }
    .ph-hea-top {
        height: 51px;
        background: #176db6;
    }
    .ph-hea-logo {
        float: left;
        width: 177px;
        height: 51px;
    }
    .ph-hea-logo a {
        display: block;
        width: 177px;
        height: 51px;
        margin: 0;
        background: url(../images/logo2.png) no-repeat 10px 10px;
        background-size: 167px 30px;
    }
    .headertop .hea-nav {
        width: 100%;
    }
    ul.nav-ul {
        background: #f4f4f4;
        padding: 0 5px;
        border-bottom: 1px solid #d2d2d2;
        display: -webkit-box;
        display: -webkit-flex;
        display: flex;
        -webkit-flex-flow: row wrap;
        justify-content: space-around;
        text-align: center;
    }
    ul.nav-ul li {
        display: inline-block;
        padding: 0 0 0 4px;
        position: relative;
    }
    ul.nav-ul li a {
        display: inline-block;
        color: #525259;
        font-size: 17px;
        height: 50px;
        line-height: 50px;
    }
    ul.nav-ul li .nav-btn{
        display: none;
        background: url(../images/show.png) no-repeat center 5px;
        background-size: 50%;
        position: absolute;
        height: 17px;
        bottom: -1px;
        width: 100%;
    }
    ul.nav-ul li .nav-btn-show.active{
        background: url(../images/child-bg1.png) no-repeat center bottom;
        background-size: 20%;
        position: absolute;
        z-index: 5;
        bottom: -1px;
    }
    ul.nav-ul li:nth-child(1) .nav-btn{
        background: url(../images/child-bg0.png) no-repeat center 7px;
        background-size: 30%;
    }
    ul.nav-ul li.active a{
        color: #0039a6;
    }
    ul.nav-ul li.active .nav-btn{
        display: block;
    }