.list {
  width: 925px;
  float: left;
}

.img-box {
  width: 298px;
  margin-right: 15px;
  float: left;
  margin-top: 20px;
}

.img-box:hover .img-text span {
  color: #0D71FA;
}

.img-box:nth-child(1),
.img-box:nth-child(2),
.img-box:nth-child(3) {
  margin-top: 0;
}

.img-box:nth-child(3n) {
  margin-right: 0;
}

/* .img-box:nth-last-child(-n+3) {
  margin-bottom: 0;
} */

.img-box img {
  width: 100%;
  height: 168px;
  display: block;
  border-radius: 6px 6px 0 0;
}

.img-box .img-text {
  width: 100%;
  background-color: #fff;
  padding: 16px 17px 17px 13px;
  box-shadow: 0px 8px 13px -3px rgba(0, 0, 0, 0.05);
  border-radius: 0 0 6px 6px;
}

.img-box .img-text .flex {
  display: flex;
  display: -webkit-flex;
  justify-content: space-between;
}

.img-box .img-text span {
  display: block;
  width: 285px;
  font-family: PingFang TC, PingFang TC;
  font-weight: 400;
  font-size: 16px;
  color: #333333;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  word-break: break-all;
  margin-bottom: 8px;
}

.img-box .img-text p {
  font-family: PingFang TC, PingFang TC;
  font-weight: 400;
  font-size: 16px;
  color: #999999;
}

.img-box .img-text i {
  font-family: PingFang TC, PingFang TC;
  font-weight: 400;
  font-size: 16px;
  color: #999999;
}

.course {
  width: 340px;
  float: right;
  background: white;
  padding: 20px 10px 0 20px;
  border-radius: 8px 8px 8px 8px;
}

.course .title h3 {
  font-family: PingFang TC, PingFang TC;
  font-weight: 600;
  font-size: 18px;
  color: #333333;
  border-bottom: 1px dashed #DEDEDE;
  padding-bottom: 10px;
  position: relative;
}

.course .title h3::after {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: #FD463D;
  position: absolute;
  left: 0;
  bottom: -1px;
}

.course .course_box {
  padding-top: 20px;
}

.course .course_box .item-wrap {
  position: relative;
  display: inline-block;
  height: 48px;
  margin-bottom: 16px;
  cursor: pointer;
  transition: all 0.5s;
  margin-bottom: 20px;
}

.course .course_box .item-wrap:hover {
  height: 200px;
}

.course .course_box .item-wrap:hover .active-item {
  height: 200px;
  opacity: 1;
}

.course .course_box .item-wrap:hover p {
  color: #0D71FA;
}

.course .course_box .item-wrap:hover span {
  color: #0D71FA;
}

.course .course_box .active-item {
  height: 0;
  border-radius: 6px;
  opacity: 0;
  position: relative;
  overflow: hidden;
  transition: all 0.5s;
}

.course .course_box .active-item img {
  width: 309px;
  height: 174px;
  margin-top: 7px;
  border-radius: 6px;
}

.course .course_box .course_text p {
  width: 300px;
  font-family: PingFang TC, PingFang TC;
  font-weight: 400;
  font-size: 14px;
  color: #333;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  word-break: break-all;
}

.course .course_box .course_text span {
  display: block;
  font-family: PingFang TC, PingFang TC;
  font-weight: 400;
  font-size: 14px;
  color: #999999;
  padding-top: 6px;
}

.list-wrap {
  margin-bottom: 50px;
}