.main {
  margin-bottom: 240px;
}
.main .main-box:not(:first-child) {
  margin-top: 50px;
  overflow: hidden;
}
.main .main-box .title-box {
  margin-left: 75px;
  border-radius: 3px;
  border-left: 5px solid #FF3C1B;
  padding-left: 24px;
  margin-top: 78px;
}
.main .main-box .title-box .title {
  font-size: 34px;
  font-weight: bold;
  color: #0133C3;
  line-height: 1;
  margin-bottom: 18px;
}
.main .main-box .title-box .title-introduce {
  font-size: 34px;
  color: #0133C3;
  line-height: 1;
}
.main .main-box .course-cards {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  margin-top: 78px;
}
.main .main-box .course-cards .card-item:not(:nth-child(-n+3)) {
  margin-top: 100px;
}
.main .main-box .course-cards .card-item {
  width: 390px;
}
.main .main-box .course-cards .card-item .card-img {
  width: 100%;
  height: 448px;
}
.main .main-box .course-cards .card-item .card-info {
  padding: 16px 0;
  color: #333333;
}
.main .main-box .course-cards .card-item .card-info .card-tit {
  font-size: 30px;
  margin-bottom: 20px;
  line-height: 1;
}
.main .main-box .course-cards .card-item .card-info .price {
  display: flex;
  align-items: flex-end;
}
.main .main-box .course-cards .card-item .card-info .price .current-price {
  font-size: 30px;
  line-height: 1;
}
.main .main-box .course-cards .card-item .card-info .price .original-price {
  font-size: 16px;
  text-decoration: line-through;
  color: #999999;
  margin-left: 20px;
  font-weight: 400;
}
.main .main-box .course-cards .card-item .card-info .price .buy-btn {
  width: 120px;
  height: 37px;
  background: #B20017;
  border-radius: 10px;
  background-color: #B20017;
  font-size: 23px;
  font-weight: 400;
  color: #FFFFFF;
  line-height: 37px;
  text-align: center;
  margin-left: auto;
  cursor: pointer;
}
.main .main-box .course-cards .card-item .card-info .price .course-cont-introduce {
  font-size: 22px;
  font-weight: 400;
  color: #999999;
  line-height: 37px;
}