.banner {
  width: 100%;
  position: relative;
}
.banner img {
  width: 100%;
  height: auto;
}
.banner .banner_content {
  position: absolute;
  width: 1200px;
  text-align: center;
  letter-spacing: 4px;
  left: 50%;
  top: 13%;
  transform: translateX(-50%);
}
.banner .banner_content h3 {
  font-size: 48px;
  color: #ffffff;
  font-weight: normal;
  width: auto;
}
.banner .banner_content p {
  margin-top: 50px;
  margin-left: 80px;
  text-align: center;
  font-size: 24px;
  color: #e0dede;
  line-height: 70px;
  font-weight: bold;
}
.banner .tablist {
  position: absolute;
  bottom: 180px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 1;
}
.banner .tablist .tabitem .tab {
  width: 165px;
  display: flex;
  justify-content: center;
  box-sizing: border-box;
  padding-bottom: 15px;
  border: 3px solid transparent;
}
.banner .tablist .tabitem .tab .tab_logo {
  display: block;
}
.banner .tablist .tabitem .video {
  width: 60px;
  height: 60px;
  background: url("../images/important/video.png");
}
.banner .tablist .tabitem .photo {
  width: 62px;
  height: 52px;
  background: url("../images/important/photo.png");
}
.banner .tablist .tabitem .book {
  width: 74px;
  height: 61px;
  background: url("../images/important/book.png");
}
.banner .tablist .tabitem p {
  text-align: center;
  margin-top: 20px;
  font-size: 20px;
  letter-spacing: 2px;
  color: #ffffff;
}
.banner .tablist .tabitem .tab_video:hover {
  border-bottom: 3px solid #dfb302;
}
.banner .tablist .tabitem .tab_video:hover .video {
  background: url("../images/important/video_active.png");
}
.banner .tablist .tabitem .tab_photo:hover {
  border-bottom: 3px solid #dfb302;
}
.banner .tablist .tabitem .tab_photo:hover .photo {
  background: url("../images/important/photo_active.png");
}
.banner .tablist .tabitem .tab_book:hover {
  border-bottom: 3px solid #dfb302;
}
.banner .tablist .tabitem .tab_book:hover .book {
  background: url("../images/important/book_active.png");
}
.banner .mask {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 220px;
  background-color: rgba(0, 0, 0, 0.6);
}
.banner .mask .search {
  position: absolute;
  left: 50%;
  bottom: 50px;
  transform: translateX(-50%);
  display: flex;
}
.banner .mask .search .search_input,
.banner .mask .search .search_button {
  outline: none;
  border: none;
}
.banner .mask .search .search_input {
  width: 1036px;
  height: 50px;
  border-radius: 7px 0 0 7px;
  padding-left: 26px;
  font-size: 20px;
}
.banner .mask .search .search_button {
  width: 136px;
  background-color: #f3d61e;
  color: #999999;
  font-size: 20px;
  letter-spacing: 2px;
  cursor: pointer;
  border-radius: 0 7px 7px 0;
}
.main .header {
  padding-left: 102px;
}
.main .header h2 {
  color: #0133c3;
  font-size: 34px;
  font-weight: bold;
  position: relative;
}
.main .header h2::after {
  content: "";
  position: absolute;
  width: 5px;
  height: 90px;
  background: #ff3c1b;
  border-radius: 4px;
  left: -26px;
  top: 0;
}
.main .header h3 {
  color: #0133c3;
  font-size: 34px;
  font-weight: normal;
  padding-top: 18px;
}
.main .header p {
  padding-top: 28px;
  color: #999999;
  font-size: 24px;
  line-height: 30px;
}
.main .main1 {
  padding-top: 80px;
  padding-bottom: 33px;
}
.main .main1 .main1_wrapper {
  display: flex;
  justify-content: center;
  margin-top: 100px;
}
.main .main1 .main1_wrapper .item1 {
  margin-right: 20px;
}
.main .main1 .main1_wrapper .item1 .img_box {
  width: 420px;
  height: 367px;
}
.main .main1 .main1_wrapper .item1 .img_box img {
  width: 100%;
  height: 100%;
}
.main .main1 .main1_wrapper .item2 {
  padding-right: 20px;
}
.main .main1 .main1_wrapper .item2 .img_box {
  width: 420px;
  height: 411px;
}
.main .main1 .main1_wrapper .item2 .img_box img {
  width: 100%;
  height: 100%;
}
.main .main1 .main1_wrapper .item3 .img_box {
  width: 420px;
  height: 480px;
}
.main .main1 .main1_wrapper .item3 .img_box img {
  width: 100%;
  height: 100%;
}
.main .info {
  padding-left: 25px;
}
.main .info h2 {
  color: #333333;
  font-size: 30px;
  padding-top: 16px;
  padding-bottom: 20px;
}
.main .info p {
  color: #717171;
  font-size: 22;
  line-height: 30px;
  width: 350px;
}
.main .main2 {
  width: 1300px;
  margin: 0 auto;
}
.main .main2 .main2_wrapper {
  display: flex;
  padding-top: 20px;
}
.main .main2 .main2_wrapper .img_box {
  width: 650px;
  height: 436px;
}
.main .main2 .main2_wrapper .img_box img {
  width: 100%;
  height: 100%;
}
.main .main2 .main2_wrapper .right_box {
  box-sizing: border-box;
  width: 650px;
  height: 436px;
  padding: 27px 35px;
  position: relative;
  margin-bottom: 120px;
}
.main .main2 .main2_wrapper .right_box .avator {
  width: 118px;
  height: 119px;
}
.main .main2 .main2_wrapper .right_box .img {
  width: 56px;
  height: 41px;
  position: absolute;
  right: 35px;
  top: 35px;
}
.main .main2 .main2_wrapper .right_box .list {
  margin-top: 38px;
}
.main .main2 .main2_wrapper .right_box .list .list_item {
  display: none;
  min-height: 128px;
}
.main .main2 .main2_wrapper .right_box .list .item1 {
  display: block;
}
.main .main2 .main2_wrapper .right_box .list p {
  color: #666666;
  font-size: 16px;
  line-height: 32px;
}
.main .main2 .main2_wrapper .right_box .list .prev_next {
  text-align: right;
}
.main .main2 .main2_wrapper .right_box .list .prev_next .prev {
  display: inline-block;
  font-size: 28px;
  color: #999999;
  cursor: pointer;
}
.main .main2 .main2_wrapper .right_box .list .prev_next .next {
  display: inline-block;
  font-size: 28px;
  color: #333333;
  cursor: pointer;
}
.main .main2 .main2_wrapper .right_box .list .name {
  font-size: 18px;
  color: #666666;
  padding-top: 22px;
}
.main .main2 .main2_wrapper .right_box .list .name span {
  color: #F5031A;
  font-weight: bold;
}


.main .course-cards {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  margin-top: 78px;
}
.main .course-cards .card-item:not(:nth-child(-n+3)) {
  margin-top: 100px;
}
.main .course-cards .card-item {
  width: 390px;
}
.main .course-cards .card-item .card-img {
  width: 100%;
  height: 448px;
}
.main .course-cards .card-item .card-info {
  padding: 16px 0;
  color: #333333;
}
.main .course-cards .card-item .card-info .card-tit {
  font-size: 30px;
  margin-bottom: 20px;
  line-height: 1;
}
.main .course-cards .card-item .card-info .price {
  display: flex;
  align-items: flex-end;
  min-height: 36px;
}
.main .course-cards .card-item .card-info .price .current-price {
  font-size: 30px;
  line-height: 1;
}
.main .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 .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 .course-cards .card-item .card-info .p {
  font-size: 22px;
  font-weight: 400;
  color: #999999;
  line-height: 37px;
  margin-top: 50px;
  width: 352px;
  text-align: justify;
}
.main .course-cards .card-item .card-info .p2 {
  width: 378px;
  font-size: 14px;
  font-weight: 400;
  color: #999999;
  line-height: 22px;
}
.main .course-cards .card-item .card-info .price .course-cont-introduce {
  font-size: 22px;
  font-weight: 400;
  color: #999999;
  line-height: 37px;
}