.nav{width: 100%;}
.nav .nav_bx{width: 1200px;height: 138px; margin:0 auto;}
.search{height: 28px;width: 220px;float: right;padding-top: 26px;position: relative;padding-bottom: 26px;margin-right: 18px;}
.search input{width: 170px;height: 26px;border: 1px solid #e0e0e0;float: left;}
.search a{width: 38px;height: 26px;line-height:26px;text-align:center;background: #d70c19;border:0;float: right;color:#fff;  font-size: 14px}
.search .sousuo{width: 18px;height: 15px;position: absolute;background: url(../img/sousuo.png);right: 55px;top: 33px;cursor: pointer;}
.logo{width: 303px;height: 41px;clear:both;float: left;}
.topnav{float: right;}
.topnav li{float: left;width: 96px;text-align: center;}
.topnav li a{color:#000;font-size: 14px;height: 53px;display:block;position: relative;}
.topnav li:hover{border-bottom: 4px solid #d70c19;}
.topnav li.cuuret{border-bottom: 4px solid #d70c19;}
.topnav  li ol{width: 95px;height: auto;background-color:rgba(0,0,0,0.5);position: absolute;top:138px;
    z-index:1000000;}
.topnav  li ol li:hover{border:0;background: #d70c19;}
.topnav  li ol li a{width: 95px;height: 33px;color:#fff;font-size: 13px;line-height: 33px;text-align: center;}