.main-content {
  background-color: #f2f3f5;
}

.header-container {
  height: 65px;
  background: #fff;
}

.detail_top {
  width: 100%;
  height: 70px;
  background: #fff;
}
.detail_header {
  background: #272626;
  padding: 50px 0 70px;
}
.detail_header .title {
  font-size: 24px;
  font-weight: 500;
  color: #FFFFFF;
  line-height: 33px;
}
.detail_header .subtitle {
  font-size: 16px;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.59);
  line-height: 22px;
  margin-top: 7px;
}
.detail_header .video_box {
  margin-top: 22px;
  height: 488px;
}
.detail_header .video_box .player {
  width: 950px;
  height: 100%;
}
.detail_header .video_box .player video{
  width: 100%;
  height: 100%;
}
.detail_header .video_box .video_list {
  width: 250px;
  height: 100%;
  background: #333333;
  margin: 0;
  padding: 0;
}
.detail_header .video_box .video_list .lecturer {
  width: 100%;
  height: 83px;
  display: -webkit-flex;
  display: -moz-flex;
  display: -ms-flexbox;
  display: flex;
  align-items: center;
}
.detail_header .video_box .video_list .lecturer .img_box {
  width: 51px;
  height: 51px;
  border-radius: 50%;
  margin-left: 16px;
  overflow: hidden;
}
.detail_header .video_box .video_list .lecturer .text_box {
  margin-left: 10px;
}
.detail_header .video_box .video_list .lecturer .text_box .name {
  font-size: 16px;
  font-weight: 500;
  color: #FFFFFF;
  line-height: 22px;
}
.detail_header .video_box .video_list .lecturer .text_box .display_num {
  font-size: 14px;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.8);
  line-height: 20px;
  margin-top: 7px;
}
.detail_header .video_box .video_list .list {
  height: calc(100% - 135px);
}
.detail_header .video_box .video_list .list .tab{
  width: 100%;
  height: 50px;
  background: #222121;
}
.detail_header .video_box .video_list .list .tab>li{
  width: 50%;
  text-align: center;
  font-size:  16px;
  color: rgba(255,255,255,.5);
  line-height: 50px;
  cursor: pointer;
}
.detail_header .video_box .video_list .list .tab>li.active {
  color: #fff;
}
.detail_header .video_box .video_list .list .class_hour {
  display: none;
}
.detail_header .video_box .video_list .list .class_hour.active {
  display: block;
}
.detail_header .video_box .video_list .list .class_hour .item {
  width: 100%;
  height: 60px;
  cursor: pointer;
  box-sizing: border-box;
  padding: 9px 17px;
}
.detail_header .video_box .video_list .list .class_hour .item a {
  display: flex;
  width: 100%;
  height: 100%;
  align-items: center;
}
.detail_header .video_box .video_list .list .class_hour .item.active {
  background: #222121;
}
.detail_header .video_box .video_list .list .class_hour .item:hover {
  background: #222121;
}
.detail_header .video_box .video_list .list .class_hour .item .icon{
  display: inline-block;
  width: 19px;
  height: 17px;
  background: url(../images/video.png) no-repeat center/cover;
  padding: 0;
  border-radius: 2px;
  margin-right: 5px;
}
.detail_header .video_box .video_list .list .class_hour .item .text_box {
  width: calc(100% - 25px);
}
.detail_header .video_box .video_list .list .class_hour .item .text_box .class_title {
  font-size: 15px;
  font-weight: 500;
  color: #FFFFFF;
  line-height: 21px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.detail_header .video_box .video_list .list .class_hour .item .text_box .duration {
  font-size: 12px;
  color: rgba(247, 247, 247, 0.67);
  line-height: 17px;
  margin-top: 3px;
}
.detail_header .video_box .video_list .list .about_video {
  display: none;
  height: 100%;
  overflow: auto;
}
.detail_header .video_box .video_list .list .about_video.active {
  display: block;
}
.detail_header .video_box .video_list .list .about_video::-webkit-scrollbar {
  display: none;
}
.detail_header .video_box .video_list .list ul li {
  width: 100%;
  height: 50px;
  cursor: pointer;
  box-sizing: border-box;
  padding: 0px 17px;
  line-height: 50px;
  font-size: 15px;
  font-weight: 500;
  color: #FFFFFF;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.detail_header .video_box .video_list .list ul li.active {
  background: #222121;
}
.detail_header .video_box .video_list .list ul li:hover {
  background: #222121;
}
.detail_header .video_box .video_list .list ul li a{
  display: block;
  width: 100%;
  height: 100%;
  font-size: 15px;
  font-weight: 500;
  color: #FFFFFF;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.detail_recommend {
  padding: 20px;
}
.detail_recommend .title_box {
  margin-bottom: 8px;
  line-height: 20px;
}
.detail_recommend .title_box .text{
  height: auto;
  font-size: 16px;
  color: #000000;
  line-height: 22px;
}
.detail_recommend .title_box .btn{
  padding: 2px 12px;
  color: #8C8C8C;
  font-size: 14px;
  background: #FFFFFF;
  border-radius: 2px;
  border: 1px solid #D1D1D1;
  cursor: pointer;
}
.detail_contents {
  font-size: 16px;
  color: #000000;
  line-height: 22px;
  padding: 20px;
}
.detail_contents .title {
  margin-bottom: 10px;
}
.detail_contents .text {
  min-height: 100px;
  font-size: 14px;
  color: #666;
  background: #FFFFFF;
  border: 1px solid #E9E9E9;
  padding: 20px;
  line-height: 28px;
}

.info-box {
  width: 1200px;
  margin: 20px auto;
  background: #fff;
}

/* 视频列表开始 */
.video_list {
  width: 1200px;
  margin: auto;
  padding: 0 20px;
  box-sizing: border-box;
  background: #fff;
}
.video_list .classification .title_box {
  padding-bottom: 12px;
}
.video_list .classification .title_box .class_title .text{
  font-size: 20px;
    color: #414244;
    font-weight: 600;
    line-height: 20px;
    vertical-align: middle;
}
.video_list .classification .title_box .class_title .icon {
  vertical-align: middle;
  width: 48px;
  height: 20px;
  background: url('../images/hot.png') no-repeat;
}
.video_list .classification .title_box .sort_title li{
  margin-left: 30px;
  font-size: 14px;
  color: #414244;
  line-height: 20px;
  cursor: pointer;
}
.video_list .classification .title_box .sort_title li.active {
  /* font-size: 16px; */
  font-weight: 600;
  color: #414244;
  position: relative;
}
.video_list .classification .title_box .sort_title li.active::after {
  content: '';
  display: block;
  position: absolute;
  left: 50%;
  top: 100%;
  width: 24px;
  height: 3px;
  background: #6979FF;
  border-radius: 2px;
  -webkit-transform: translate(-50%, 8px);
  -moz-transform: translate(-50%, 8px);
  -ms-transform: translate(-50%, 8px);
  transform: translate(-50%, 8px);
}
.video_list .classification .title_box .more {
  font-size: 14px;
  color: #414244;
  line-height: 22px;
}
.video_list .classification .title_box .more .icon {
  display: block;
  width: 5px;
  height: 5px;
  margin: 0;
  padding: 0;
  margin-left: 2px;
  margin-top: 7px;
  background: none;
  float: right;
  border-top: solid 1.5px #333;
  border-right: solid 1.5px #333;
  -webkit-transform: rotate(45deg);
  -moz-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  transform: rotate(45deg);
}
.video_list .classification .list_box {
  padding: 12px 0 12px;
}
.video_list .classification .list_box .item_box {
  display: none;
}
.video_list .classification .list_box .item_box.active {
  display: block;
}
.video_list .classification .list_box .item {
  width: 272px;
  background: #FFFFFF;
  box-shadow: 0px 0px 10px 1px rgba(0, 0, 0, 0.1);
  border-radius: 6px;
  margin-right: 24px;
  overflow: hidden;
  margin-bottom: 15px;
  cursor: pointer;
}
.video_list .classification .list_box .item:nth-child(4n) {
  margin-right: 0px;
}
.video_list .classification .list_box .item .img_box{
  width: 272px;
  height: 135px;
}
.video_list .classification .list_box .item .img_box img {
  width: 100%;
  height: 100%;
  vertical-align: middle;
}
.video_list .classification .list_box .item .text_box {
  padding: 10px 15px;
  background: #fff;
}
.video_list .classification .list_box .item .text_box .title {
  font-size: 14px;
  color: #333333;
  line-height: 20px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.video_list .classification .list_box .item .text_box .information {
  margin-top: 10px;
}
.video_list .classification .list_box .item .text_box .information .label {
  color: #FF3E39;
  font-size: 13px;
  line-height: 20px;
}
.video_list .classification .list_box .item .text_box .information .lockdoc {
  font-size: 13px;
  color: #999999;
  line-height: 20px;
}
/* 视频列表结束 */