.clear:after{content:'';display:block;visibility:hidden;clear:both;height:0}.float-left{float:left}.float-right{float:right}.nav{height:40px;position:relative}.nav a{color:#383838}.nav .nav-first{display:flex;height:100%}.nav .nav-first>li{height:100%;display:flex;align-items:center;justify-content:center;position:relative;transition:all .5s}.nav .nav-first>li.active .nav-second{display:block}.nav .nav-first>li.teacher-power .nav-second{background:rgba(255,255,255,0.5)}.nav .nav-first>li:hover{background-color:#FFE100}.nav .nav-first>li:first-child{width:250px}.nav .nav-first>li:not(:first-child){padding:0 46px}.nav .nav-first>li.active{background-color:#FFE100}.nav .nav-second{display:none;top:40px;z-index:100;position:absolute;width:100%;box-sizing:border-box;background:rgba(255,255,255,.8)}.nav .nav-second>li{height:69px;display:flex;justify-content:space-between;align-items:center;padding:0 15px 1px;position:relative;transition:all .5s}.nav .nav-second>li:hover{background-color:#fff}.nav .nav-second>li:hover .icon-right{background-image:url("../../img/home/jiant02.png")}.nav .nav-second>li a{color:#919191}.nav .nav-second>li:not(:last-child):after{content:'';position:absolute;width:calc(100% - 30px);bottom:0;height:1px;left:15px;background-color:#e6e6e6}.nav .nav-second>li .icon-right{width:6px;height:10px;background-repeat:no-repeat;background-size:100% 100%;background-image:url("../../img/home/jiant01.png")}.nav .nav-third{position:absolute;top:10px;left:100%;width:450px;min-height:100px;background-color:#fff;display:none;padding:10px 25px 10px 15px}.nav .nav-third>li{padding:20px 20px 20px 15px}.nav .nav-third>li b{color:#282727}.nav .nav-third>li .head{font-weight:bold;color:#282727;float:left}.nav .nav-third>li .main{font-size:14px;display:flex;flex-wrap:wrap;margin-left:80px}.nav .nav-third>li .main a{display:block;padding:0 20px;margin-bottom:20px;color:#808080}.nav .nav-third>li .main a:hover{color:#1297DA}.nav .nav-third>li:not(:last-child){border-bottom:1px solid #E6E6E6}ul,li{list-style:none;margin:0;padding:0}a{text-decoration:none}.page{width:100%;background-color:#b1b1b1}.title{width:100%}.title>div{width:1200px;margin:30px auto}.title>div>p{text-align:center;font-size:34px;margin:0}.main{width:100%;margin:0;padding:0}.main .centre{width:850px;margin:0 auto;}.main .centre img{max-width:100%}