.er,.san,.si{display:none;}
.nav-list>li{position:relative;}
.nav-list>li>.er{width: 160px;position:absolute;top:50px;left: 50%;margin-left: -80px;}
.nav-list>li>.er>li,.nav-list>li>.er>li>.san>li,.nav-list>li>.er>li>.san>li>.si>li{background: #000;opacity: 0.6;}
.nav-list>li>.er>li:hover{opacity: 0.8;}
.nav-list>li>.er>li>.san>li:hover{opacity: 0.8;}
.nav-list>li>.er>li>.san>li>.si>li:hover{opacity: 0.8;}
.nav-list>li>.er li:hover a{color:#fff;}
.nav-list>li .er li,.nav-list>li .er li a{width:100%;line-height:36px;color:#fff;padding:0;white-space:nowrap;padding:0 6px;}
.nav-list>li:hover .er{display:block;}
.nav-list>li>.er>li>.san{position:absolute;top:50px;left:100%;top:0;}
.nav-list>li>.er>li:hover>.san{display:block;}
.nav-list>li>.er>li>.san>li>.si{position:absolute;top:50px;left:100%;top:0;}
.nav-list>li>.er>li>.san>li:hover>.si{display:block;}