.tab-nav {
  width: 1200px;
  padding-top: 20px;
  margin-bottom: 10px;
}
.tab-nav .tab-link {
  margin-bottom: 20px;
  margin-right: 25px;
  width: 220px;
  height: 52px;
  background: #FFFFFF;
  box-shadow: 0px 0px 10px 0px #E6E6E6;
  font-weight: 400;
  font-size: 20px;
  color: #333333;
  float: left;
  text-align: center;
  line-height: 52px;
  cursor: pointer;
}
.tab-nav .tab-link:nth-child(5n) {
  margin-right: 0;
}
.tab-nav .tab-link.active, .tab-nav .tab-link:hover {
  background: #8A1E23;
  box-shadow: 0px 0px 10px 0px #FFCED0;
  font-weight: bold;
  font-size: 20px;
  color: #FFFFFF;
}

.mb-39 {
  margin-bottom: 39px;
}

.tab-pane,
.video-list-wrap {
  padding: 10px;
  margin-bottom: 100px;
}
.tab-pane.mb-50,
.video-list-wrap.mb-50 {
  margin-bottom: 50px;
}
.tab-pane .video-item,
.video-list-wrap .video-item {
  width: 364px;
  height: 300px;
  float: left;
  margin-right: 44px;
  cursor: pointer;
}
.tab-pane .video-item .video-wrap,
.video-list-wrap .video-item .video-wrap {
  width: 364px;
  height: 208px;
  margin-bottom: 12px;
  position: relative;
  background: #eee;
}
.tab-pane .video-item .video-wrap img,
.video-list-wrap .video-item .video-wrap img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.tab-pane .video-item .video-wrap .zhezhao,
.video-list-wrap .video-item .video-wrap .zhezhao {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.tab-pane .video-item .video-wrap .zhezhao:hover,
.video-list-wrap .video-item .video-wrap .zhezhao:hover {
  background: rgba(0, 0, 0, 0.3);
}
.tab-pane .video-item .video-wrap .zhezhao .play-btn,
.video-list-wrap .video-item .video-wrap .zhezhao .play-btn {
  width: 48px;
  height: 48px;
}
.tab-pane .video-item .item-name,
.video-list-wrap .video-item .item-name {
  font-weight: 400;
  font-size: 18px;
  color: #1A1A1A;
  margin-bottom: 5px;
}
.tab-pane .video-item .item-name:hover,
.video-list-wrap .video-item .item-name:hover {
  color: #8A1E23;
}
.tab-pane .video-item:nth-child(3n),
.video-list-wrap .video-item:nth-child(3n) {
  margin-right: 0;
}
.tab-pane .video-item .video-tips,
.video-list-wrap .video-item .video-tips {
  display: flex;
  justify-content: space-between;
  font-weight: 400;
  font-size: 16px;
  color: #808080;
}