.nav{z-index:10;top:40px;right:0px;position:absolute; background:rgba(0,0,0,0.0);border-radius:5px;overflow: hidden; }
.nav .nav_list{width:800px; margin:auto;height:70px;display:flex;}
.nav li{float:left; width:100%;position:relative;flex:1; margin:0 0 0 1px;background:rgba(0,0,0,0.1);}
.nav li.last{background:none;}
.nav li a{float:left;display:block; width:100%;text-align:center; line-height:1.2; }
.nav li a:hover{background:#F90; text-decoration:none;}
.nav li a span{float:left;display:block; width:100%; height:70px; line-height:70px;cursor:pointer; font-family:"Microsoft YaHei";text-align:center; color:#fff; font-size:18px;}
.nav li a.selected{ background:#F90; color:#fff;}
.nav li a.selected2{ background:#FF9900; color:#fff;}/*===一级当前栏目样式=*/

/*========以下二级导航样式=*/
.nav li.selected .submenu{display:block;}
.nav li .submenu{display:none;position:absolute;top:55px;left:0px; background:rgba(0,0,0,0.6);}
.nav li .submenu{width:100%;}
.nav li .submenu{ z-index:999;}
.nav li .submenu li{float:left;padding:0;background:none; font-size:16px;}
.nav li .submenu li a{float:none;padding:13px 8px;box-sizing: border-box;text-align: center; font-family:"Microsoft YaHei";background:none; color:#fff; line-height:1.3;}
.nav li .submenu li a:hover{background:#145ab2;font-weight:normal; color:#fff; text-decoration:none;}