.nav_bar_body{width: 100%;background-color: rgba(28,137,255,0.9);z-index: 9999;position: relative;}
.nav_bar{width: 1200px;margin: 0 auto;}
.nav_bar:after{display: block;content: "";clear: both;}
.nav_bar li{width: 25%;float: left;padding: 45px 0;box-sizing: border-box;position: relative;text-align: center;}
.nav_bar li a{display: inline-block;}
.nav_bar li a:after{ content: "";display: block;clear: both;}
.nav_bar li a i{font-size: 50px;color: #fff;float: left;margin-right: 8px;}
.nav_bar li a div{overflow: hidden;float: left;}
.nav_bar li a div span{display: block;font-size: 16px;color: #fff;font-weight: bold;}
.nav_bar li a div font{display: block;font-size: 14px;color: #393939;background-color: #d2e7ff;padding: 0 8px;border-radius: 100px;margin-top: 8px;}
.nav_bar li:after{content: "";display: block;width: 2px;height: 100%;position: absolute;right: -1px;top: 0;background: url(../images/nav_barback_03.png);background-size: 100% 100%;}
.nav_bar li:first-child:before{content: "";display: block;width: 2px;height: 100%;position: absolute;left: -1px;top: 0;background: url(../images/nav_barback_03.png);background-size: 100% 100%;}




.classbody dd{width: 1200px;margin: 0 auto;}
.classbody dd ul{margin-top: 20px;}
.classbody dd ul:after{display: block;content: "";clear: both;}
.classbody dd li{width: calc(25% - 15px);margin-right: 20px;float: left;}
.classbody dd li:last-child{margin-right: 0;}
.classbody dd li video{width: 100%;}
.classbody dd li h3{font-size: 16px;color: #000000;overflow: hidden;text-overflow: ellipsis;white-space: nowrap;line-height: 1.5;}
.classbody dd li p{font-size: 14px;color: #4d4d4d;overflow: hidden;text-overflow: ellipsis;white-space: nowrap;line-height: 1.5;}




.downloadbody .content{width: 1200px;margin: 0 auto;padding-top: 20px;}
.downloadbody .content:after{display: block;content: "";clear: both;}
.downloadbody .content .list2{width: calc(50% - 10px);float: left;}
.downloadbody .content .list2:last-child{margin-left: 20px;}
.downloadbody .content .list2 dt{border-bottom: 1px solid #acacac;margin-bottom: 15px;padding-bottom: 10px;}
.downloadbody .content .list2 dt img{width: 100%;}
.downloadbody .content .list2 dt div font{float: right;margin-left: 15px;line-height: 45px;height: 45px;font-size: 16px;color: #4a4a4a;}
.downloadbody .content .list2 dt div font i{display: inline-block;margin-right: 5px;color: #1C89FF;line-height: 45px;height: 45px;}
.downloadbody .content .list2 dt div span{display: block;overflow: hidden;text-overflow: ellipsis;white-space: nowrap;line-height: 45px;height: 45px;color: #000000;font-size: 16px;}
.downloadbody .content .list2 dt div span a{font-size: 16px;line-height: 45px;height: 45px;color: #000000;font-weight: bold;}

.downloadbody .content .list2 dd font{float: right;margin-left: 15px;line-height: 40px;height: 40px;font-size: 14px;color: #4a4a4a;}
.downloadbody .content .list2 dd font i{display: inline-block;margin-right: 16px;color: #1C89FF;line-height: 40px;height: 40px;}
.downloadbody .content .list2 dd span{display: block;overflow: hidden;text-overflow: ellipsis;white-space: nowrap;line-height: 40px;height: 40px;color: #000000;font-size: 16px;}
.downloadbody .content .list2 dd span a{font-size: 14px;line-height: 40px;height: 40px;color: #000000;}



.teacherbody .content{width: 1200px;margin: 0 auto;padding-top: 20px;}
.teacherbody .content .list2{padding: 5px;}
.teacherbody .content .list2:after{display: block;content: "";clear: both;}
.teacherbody .content .list2 li{float: left;width: calc(25% - 15px);margin-left: 20px;}
.teacherbody .content .list2 li:first-child{margin-left: 0;}
.teacherbody .content .list2 h3 i{float: right;line-height: 2.5rem;height: 2.5rem;margin-left: 10px;color: #1C89FF;font-size: 1.2rem;}
.teacherbody .content .list2 h3 span{display: block;overflow: hidden;text-overflow: ellipsis;white-space: nowrap;line-height: 2.5rem;height: 2.5rem;font-size: 1rem;font-weight: normal;}
.teacherbody .content .list2 p{overflow : hidden;text-overflow: ellipsis;display: -webkit-box;-webkit-line-clamp: 2;-webkit-box-orient: vertical;line-height: 1rem;height: 2rem; margin-bottom: 10px; overflow:hidden;}
.teacherbody .content .list2 div{position: relative;border-radius: 20px;display: block;overflow: hidden;box-shadow: 0px 0px 10px 5px #e8e8e8;min-height: 390px;}
.teacherbody .content .list2 div img{width: 100%;}
.teacherbody .content .list2 div span{position: absolute;right: 15px;top: 15px;font-size: 0.8rem;color: #000;}
.teacherbody .content .list2 div span:before{content: "";display: block;float: left;width: 4px;height: 4px;border-radius: 100px;background-color: #1c89ff;margin-top: 6px;margin-right: 3px;}



.teacherbody .content .list2 div em{height: 100%;width: 100%;position: absolute;top: 0;left: 0;background: url(../images/teacherback_07.jpg);opacity: 0.7;background-size: 100% 100%;display: none;}
.teacherbody .content .list2 div em a{display: block;width: 92px;height: 91px;background: url(../images/moreback_07.png);color: #1C89FF;font-size: 14px;text-align: center;line-height: 91px;margin: auto;font-style: normal;margin-top: 130px;}
.teacherbody .content .list2 div:hover em{display: block;}
.teacherbody .content .list2 div:hover span{display: none;}