.content {
    padding-top: 92px;
    padding-bottom: 36px;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    background-color: #f5f5f5;
}

.teacher_right {
    width: 920px;
    height: auto;
    background-color: #fff;
    overflow: hidden;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    border-radius: 4px;
    min-height: 550px;
    margin-top: 12px;
    padding: 24px;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

.teacher_nav {
    width: 256px;
    height: auto;
    z-index: 999;
    background-color: #fff;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    border-radius: 4px;
    margin-top: 12px;
}

.teacher_nav .teacher_main {
    width: auto;
    height: auto;
    border-radius: 6px;
}

.teacher_nav .teacher_main ul {
    width: auto;
    height: auto;
}

.teacher_nav .teacher_main ul > li {
    border-top: 1px solid #e6e7e7;
    padding: 24px 16px;
}
.teacher_nav .teacher_main ul > li:first-child{
    border-top: 1px solid transparent;
}

.teacher_main ul li .img_wrap {
    width: 102px;
    height: 102px;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    border-radius: 50%;
    margin: 0 auto;
}

.teacher_main ul li ._text {
    margin-top: 12px;
    text-align: center;
    margin-bottom: 12px;
}

.teacher_main ul li ._text h2 {
    font-size: 20px;
    color: #444444;
    margin-bottom: 8px;
    text-align: center;
}

.teacher_main ul li ._text span {
    font-size: 14px;
    color: #9b9b9b;
    margin: 0 auto;
    text-align: center;
}

.teacher_main ul li ol {

}

.teacher_main ul li ol li {
    margin-top: 12px;
}
.teacher_main ul li ol li:first-child{
    margin-top: 0;
}

.teacher_main ul li ol li span {
    font-size: 16px;
    color: #444444;
}

.teacher_main ul li ol li span i {
    font-size: 18px;
    color: #a2a2a2;
    margin-right: 10px;
}
.teacher_main ul li p{
    font-size: 16px;
    color: #666666;
    line-height: 24px;
    margin-bottom: 24px;
}
.teacher_main ul li .follow{
    display: block;
    width: 126px;
    height: 30px;
    font-size: 16px;
    color: #ffffff;
    background-color: #ff9900;
    text-align: center;
    line-height: 30px;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    border-radius: 4px;
    margin: 0 auto;
}

.course_top{
    border-bottom: 1px solid #e6e7e7;
}

.course_top ul{

}

.course_top ul li{
    float: left;
    width: 100px;
    height: 44px;
    line-height: 32px;
    text-align: center;
    margin-right: 32px;
}
.course_top ul li a{
    font-size: 20px;
    color: #787878;
}
.course_top ul li:hover{
    border-bottom: 2px solid var(--theme-color);
}
.course_top ul li:hover a{
    color: #444444;
}
.course_top ul .on{
    border-bottom: 2px solid var(--theme-color);
}
.course_top ul .on a{
    color: var(--theme-color);
}
.course_top ol{
    overflow: hidden;
}
.course_top ol li{
    float: left;
    margin-left: 24px;
}
.course_top ol li a{
    display: block;
    width: 88px;
    height: 28px;
    line-height: 28px;
    text-align: center;
    color: #696969;
    font-size: 16px;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    border-radius: 4px;
}
.course_top ol .on a{
    background-color: var(--theme-color);
    color: #ffffff;
}

.course_top ol li a:hover{
    background-color: var(--theme-color);
    color: #ffffff;
}
.course_main {
    width: 872px;
    overflow: hidden;
    padding-top: 24px;
}

.course_main ul {
    width: 892px;
    height: auto;
    overflow: hidden;
}

.course_main ul li {
    float: left;
    width: 203px;
    margin-right: 20px;
    margin-bottom: 24px;
    text-align: center;
    position: relative;
    -webkit-border-radius: 4px;
    -moz-border-radius: 4px;
    border-radius: 4px;
    border: 1px solid #eff0f0;
}

.course_main ul li > a > .img_wrap {
    width: 201px;
    height: 120px;
    -webkit-border-radius: 4px 4px 0 0;
    -moz-border-radius: 4px 4px 0 0;
    border-radius: 4px 4px 0 0;
}

.course_main ul li > a > .img_wrap img {
    transition: all .5s;
}

.course_main ul li .text {
    width: inherit;
    border-bottom: 1px solid #eff0f0;
    padding: 0 12px;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    overflow: hidden;
    padding-bottom: 10px;
}

.course_main ul li .text a {
    display: block;
    width: auto;
    height: auto;
    font-size: 16px;
    color: #444444;
    text-align: left;
    /*line-height: 24px;*/
    margin-top: 17px;
    margin-bottom: 8px;
}

.course_main ul li .text span {
    font-size: 14px;
    color: #999999;
    float: left;
}

.course_main ul li .bottom {
    height: 50px;
    line-height: 50px;
    padding: 0 12px;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    font-size: 14px;
    color: #999999;
}

.course_main ul li .text .text_bot span, .course_main ul li .bottom span, .course_main ul li .bottom b {
    cursor: default;
}

.course_main ul li .bottom .teacher {

}

.course_main ul li .bottom .teacher .img_wrap {
    width: 30px;
    height: 30px;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    border-radius: 50%;
    margin-right: 12px;
    float: left;
    margin-top: 15px;
}

.course_main ul li .bottom .teacher .img_wrap img {
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    border-radius: 50%;
}

.course_main ul li:hover > a > .img_wrap img {
    transform: scale(1.2);
}

.course_main ul li:hover .text a {
    color: var(--theme-color);
}

.course_main ul li:hover .text .text_bot {
    color: #9da7a9;
}

.teacher_main ul li .isNo{
    background-color: #999999;
}