.page_center{
    width: 980px;
    margin: 0 auto;
    margin-top: 90px;
    position: relative;
}
.follow_btn{
    border: 1px solid #FFFFFF;
    border-radius: 4px;
    font-weight: bold;
    font-size: 14px;
    color: #FFFFFF;
    width: 60px;
    height: 28px;
    text-align: center;
    line-height: 28px;

}
.head_image{
    width: 100%;
    height: 200px;
    position: relative;
    background:url("../../images/teacher_bg.jpg") no-repeat;
    background-size: 100% 620px;
    background-position-y: -80px;
}
.headbg_img{
    width: 100%;
    height: 100%;
    background: #f6f6f6;
}
.follow_btn{
    position: absolute;
    bottom: 10px;
    right: 20px;
    cursor:pointer;
}
.teacherimg_logo{

}
.teacherimg_div{
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border:4px solid #fff;
    overflow: hidden;
    position: absolute;
    bottom: -60px;
    left: 30px;
}
.teacherimg_div img{
    width: 120px;
    height: 120px;
}
.head_con{
    /*height: 152px;*/
    width: 100%;
    overflow: hidden;
    padding-top: 30px;
}
.head_con .fl:first-child{
    width: 70%;
}
.head_con_title{
    line-height: 33px;
    font-size: 24px;
    font-weight: bold;
}
.head_con_sgin{
    font-size: 14px;
    color: #999999;
    line-height: 40px;
}
.hcon_left{
    padding-left: 170px;
    margin-bottom: 20px;
}
.hcon_right{
    height: 152px;
    width: 290px;
    background: #fbfbfb;
    border-radius: 4px;
}
.join_study{
    display: block;
    background: #FABD50;
    border-radius: 4px;
    width: 240px;
    height: 40px;
    line-height: 40px;
    font-size: 14px;
    color: #FFFFFF;
    text-align: center;
    margin: 0 auto;
    margin-top: 15px;
}
.hcon_right{
    line-height: 30px;
    font-size: 14px;
    text-align: center;
    padding-top: 15px;
}
.right_money{
    font-weight: bold;
    font-size: 16px;
    line-height: 32px;
}
.head_nav{
    width: 660px;
    height: 40px;
    background: #fbfbfb;
    font-size: 16px;
    padding-left: 20px;
    color: #999
}
.page_center .head_con .head_navs{
    width: 72px;
    height: 100%;
    line-height: 40px;
    text-align: center;
    position: relative;
    cursor:pointer;
}
.nav_tip{
    width: 20px;
    height: 2px;
    display: inline-block;
    background: #fbfbfb;
    border-radius: 4px;
    position: absolute;
    bottom: 0px;
    left: 50%;
    margin-left: -10px;
}
.active{
    color: #222;
}
.active .nav_tip{
    background: #FABD50;
}
.alfollow{
    display:none;
}
.tab1{
    display:none;
}
/* 视频列表 start */
.video_list_div{
    width:660px;
}
.video_tip{
    height: 60px;
    line-height: 60px;
    font-size: 12px;
    color: #999;
}
.list_arr{
    width: 10px;
    height: 10px;
    display: inline-block;
    background: url("../../images/list_arr.png") no-repeat;
    margin-right: 2px;
}
.video_list{
    margin-bottom: 20px;
    overflow: hidden;
}
.video_txt{
    padding-top: 10px;
    font-size: 14px;
    line-height: 32px;
    width: 485px;
}
.video_name{
    font-size: 20px;
    line-height: 28px;
    font-weight: bold;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}
.video_img{
    width: 160px;
    height: 100px;
    overflow: hidden;
    margin-right: 14px;
}
.video_img img{
    width: 160px;
    height: 100%;
    background: #f6f6f6;
}
.list_a{
    display:block;
    overflow: hidden;
}

/* 视频列表 end */
/* 简介 */
.introduct_none{
    text-align:center;
    display:none;
    font-size:20px;
}
.introduct img{
    max-width:100%;
}

.desc{
    cursor:pointer;
}
.desc .list_arr{
    background: url("../../images/list_arr_down.png") no-repeat;
    margin-right: 2px;
}
.asc{
    display:none;
    cursor:pointer;
}
.list_bottom{
    display: none;
    height: 80px;
    line-height: 80px;
    cursor: pointer;
    color: #999;
    text-align: center 
}
.video_list:hover{
    background:#fbfbfb;
}
.video_list:hover .video_name{
    color: #406599;
}
.add_more{
    height: 80px;
    line-height: 80px;
    cursor: pointer;
    color: #999;
    text-align: center !important;
}
.alfll{
    width: 160px;
    height: 40px;
    line-height: 40px;
    background: rgba(0,0,0,0.6);
    text-align: center;
    font-size: 18px;
    position: fixed;
    bottom: 80px;
    left: 50%;
    margin-left: -80px;
    color: #fff;
    border-radius: 5px;
    display: none;
}