div.l_top {
  background: #fff;
  padding: 25px 23px 13px 23px;
  margin-bottom: 24px;
}
div.l_top .top_content {
  line-height: 14px;
  margin-bottom: 12px;
}
div.l_top .top_content span {
  margin-right: 18px;
}
div.l_top .top_content button {
  float: left;
  margin: 0 18px 18px 18px;
  line-height: 14px;
  transition: all .45s;
  -webkit-transition: all .45s;
  -moz-transition: all .45s;
  -ms-transition: all .45s;
}
div.l_top .top_content button:hover {
  color: #409eff;
}
div.l_top .top_content button.curr {
  color: #409eff;
}
div.l_top .top_content button.gray {
  color: #c5c8ce;
}
div.l_top .top_content .box {
  position: relative;
  border-right: 1px solid #e8eaec;
  height: 125px;
}
div.l_top .top_content .box:last-child {
  border: 0;
}
div.l_top .top_content .box i {
  position: absolute;
  bottom: 0;
  left: 36px;
  font-size: 12px;
  color: #909399;
  background-color: #f2f4f5;
  border-radius: 4px;
  padding: 6px 10px;
}
div.l_top .top_content .engineering {
  width: 255px;
  padding-right: 18px;
}
div.l_top .top_content .engineering i {
  left: 18px;
}
div.l_top .top_content .science {
  width: 229px;
  padding: 0 18px;
}
div.l_top .top_content .humane {
  width: 223px;
  padding: 0 18px;
}
div.l_top .top_content .society {
  width: 131px;
  padding: 0 18px;
}
div.l_top .top_content .economy {
  width: 130px;
  padding: 0 18px;
}

div.r_box {
  padding: 24px 24px 0 24px;
  background: #fff;
  margin-bottom: 24px;
  min-height: 238px;
}
div.r_box .title {
  line-height: 24px;
}
div.r_box .title i {
  width: 6px;
  height: 24px;
  background-color: #3d97f2;
}
div.r_box .title span {
  font-size: 18px;
  font-weight: 600;
  margin-left: 10px;
}
div.r_box .title p {
  margin-left: 22px;
}
div.r_box .title .right_again {
  height: 24px;
  color: #66b1ff;
}
div.r_box .r_top_list {
  padding-top: 24px;
}
div.r_box .r_top_list .item {
  width: 270px;
  height: 278px;
  margin-right: 24px;
  padding: 24px;
  text-align: center;
  margin-bottom: 36px;
  transition: box-shadow .45s;
  -webkit-transition: box-shadow .45s;
  -moz-transition: box-shadow .45s;
  -ms-transition: box-shadow .45s;
}
div.r_box .r_top_list .item:hover {
  box-shadow: 0px 2px 12px 0px rgba(61, 151, 242, 0.24);
  border-radius: 4px;
}
div.r_box .r_top_list .item:last-child {
  margin-right: 0;
}
div.r_box .r_top_list .item h3 {
  font-size: 16px;
  line-height: 21px;
  margin-top: 9px;
  margin-bottom: 11px;
}
div.r_box .class_box .c_title {
  margin-top: 24px;
  margin-bottom: 18px;
  line-height: 28px;
}
div.r_box .class_box .c_title i {
  width: 28px;
  height: 28px;
  background: url(../img/rec.png) no-repeat;
  background-size: 100% 100%;
  margin-right: 15px;
}
div.r_box .class_box .c_title .hot_pic {
  background: url(../img/hot.png) no-repeat;
  background-size: 100% 100%;
}
div.r_box .class_box .c_title span {
  font-size: 16px;
  font-weight: 600;
  color: #515a6e;
}
div.r_box .class_box .class_list_box .item {
  position: relative;
  width: 270px;
  margin-right: 24px;
  margin-bottom: 24px;
  transition: box-shadow .45s;
  -webkit-transition: box-shadow .45s;
  -moz-transition: box-shadow .45s;
  -ms-transition: box-shadow .45s;
}
div.r_box .class_box .class_list_box .item:hover {
  box-shadow: 0px 2px 12px 0px rgba(61, 151, 242, 0.24);
  border-radius: 4px;
}
div.r_box .class_box .class_list_box .item .tag_img {
  position: absolute;
  top: 4px;
  left: -2px;
  width: 56px;
  height: 20px;
  background: url(../img/new_ioc.png) no-repeat;
  background-size: 100% 100%;
  z-index: 100;
}
div.r_box .class_box .class_list_box .item i.hot_tag_img {
  background: url(../img/hot_ioc.png) no-repeat;
  background-size: 100% 100%;
}
div.r_box .class_box .class_list_box .item:nth-child(4n) {
  margin-right: 0;
}
div.r_box .class_box .class_list_box .item .pic {
  width: 100%;
  height: 152px;
  overflow: hidden;
}
div.r_box .class_box .class_list_box .item .pic img {
  display: block;
  width: 100%;
}
div.r_box .class_box .class_list_box .item .txt {
  padding: 0 10px;
}
div.r_box .class_box .class_list_box .item .txt h4 {
  width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 14px;
  line-height: 14px;
  margin-top: 14px;
  margin-bottom: 10px;
}
div.r_box .class_box .class_list_box .item .txt .relation, div.r_box .class_box .class_list_box .item .txt .direction {
  font-size: 12px;
  line-height: 12px;
  margin-bottom: 10px;
  color: #808695;
}
div.r_box .class_box .class_list_box .item .txt .relation {
  width: 156px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
div.r_box .class_box .class_list_box .item .txt .direction {
  margin-left: -5px;
}
div.r_box .class_box .class_list_box .item .txt .difficulty {
  line-height: 12px;
}
div.r_box .class_box .class_list_box .item .txt .difficulty span {
  font-size: 12px;
  line-height: 12px;
  margin-bottom: 10px;
  color: #808695;
  margin-right: 5px;
}
div.r_box .class_box .class_list_box .item .txt .person_num i {
  display: inline-block;
  width: 10px;
  height: 12px;
  background: url(../img/sm_user.png) no-repeat;
  background-size: 100% 100%;
  vertical-align: -1px;
  margin-right: 5px;
}
div.r_box .class_box .no_list {
  text-align: center;
  padding: 50px;
}
div.r_box .hot_box .c_title {
  margin-top: 0;
}

.d_top {
  position: relative;
  top: 0;
  width: 100%;
  height: 418px;
  padding-top: 25px;
  margin-top: -24px;
  background: url(../img/d_top_bg.jpg) no-repeat center center;
}
.d_top .top_content {
  height: 368px;
  padding: 24px 22px 24px 24px;
  background: #fff;
}
.d_top .vid_box {
  width: 569px;
  height: 320px;
  overflow: hidden;
}
.d_top .vid_box img {
  display: block;
  width: 100%;
  height: 100%;
}
.d_top .right_box {
  position: relative;
  width: 560px;
  height: 100%;
  margin-left: 24px;
}
.d_top .right_box h3 {
  font-size: 20px;
  line-height: 20px;
  color: #17233d;
}
.d_top .right_box .analyse {
  margin-top: 23px;
  padding-bottom: 21px;
  border-bottom: 1px solid #e8eaec;
}
.d_top .right_box .analyse span {
  display: block;
  font-size: 16px;
  line-height: 16px;
  color: #17233d;
  margin-bottom: 9px;
}
.d_top .right_box .analyse .txt {
  width: 100%;
  height: 83px;
  line-height: 21px;
  color: #515a6e;
  font-size: 14px;
}
.d_top .right_box .difficulty {
  height: 16px;
  line-height: 16px;
  margin-top: 23px;
  margin-bottom: 19px;
}
.d_top .right_box .difficulty span {
  color: #515a6e;
}
.d_top .right_box .difficulty .star_box i {
  width: 16px;
  height: 16px;
  vertical-align: -3px;
}
.d_top .right_box .difficulty .left {
  width: 280px;
}
.d_top .right_box .difficulty .left .ioc {
  display: inline-block;
  width: 14px;
  height: 16px;
  background: url(../img/d_top_ioc1.png) no-repeat;
  background-size: 100% 100%;
  margin-right: 14px;
}
.d_top .right_box .difficulty .left .category {
  display: inline-block;
  width: 240px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.d_top .right_box .difficulty .right .ioc {
  display: inline-block;
  width: 14px;
  height: 16px;
  background: url(../img/d_top_ioc2.png) no-repeat;
  background-size: 100% 100%;
  margin-right: 15px;
}
.d_top .right_box .relation .left {
  width: 280px;
}
.d_top .right_box .relation .left .ioc {
  display: inline-block;
  width: 14px;
  height: 16px;
  background: url(../img/d_top_ioc3.png) no-repeat;
  background-size: 100% 100%;
  margin-right: 14px;
}
.d_top .right_box .relation .left .tags {
  width: 240px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: inline-block;
}
.d_top .right_box .relation .right .ioc {
  display: inline-block;
  width: 14px;
  height: 16px;
  background: url(../img/d_top_ioc4.png) no-repeat;
  background-size: 100% 100%;
  margin-right: 15px;
}
.d_top .right_box .join_class {
  position: absolute;
  bottom: 0;
  color: #fff;
  height: 40px;
  padding: 0 55px;
  font-size: 18px;
}

.details_box {
  padding-top: 24px;
}
.details_box .left_box {
  overflow: hidden;
  min-height: 890px;
  width: 812px;
  background-color: #ffffff;
  border-radius: 2px;
  padding-bottom: 32px;
}
.details_box .left_box .tab_list {
  width: 812px;
  height: 82px;
  padding-bottom: 38px;
  /* background: #edeff0; */
}
.details_box .left_box .tab_list.fixed{
  position: fixed;
  top: 96px;
  background: #fff;
}

.details_box .left_box .tab_list.fixed::before{
  content: '';
  display: block;
  border-top: 24px solid #f8f8f9;
  width: 812px;
  margin-top: -24px;
}
.details_box .left_box .tab_list p {
  width: 135px;
  height: 42px;
  line-height: 42px;
  text-align: center;
  font-size: 16px;
  color: #808695;
  cursor: pointer;
}
.details_box .left_box .tab_list p.curr {
  background: #fff;
  color: #3d97f2;
  position: relative;
}
.details_box .left_box .tab_list p.curr::after {
  content: '';
  display: block;
  border-top: 3px solid #3d97f2;
  width: 64px;
  position: absolute;
  bottom: 0;
  left: 50%;
  margin-left: -32px;
}
.details_box .left_box .tab_content {
  padding-bottom: 50px;
}
.details_box .left_box .tab_content > div {
  display: none;
}
.details_box .left_box .tab_content > div.show {
  display: block;
}
.details_box .left_box .class_info {
  padding-left: 24px;
}
.details_box .left_box .class_info .box {
  padding-top: 36px;
}
.details_box .left_box .class_info .box .txt {
  width: 750px;
  padding-left: 16px;
}
.details_box .left_box .class_info .box .txt p {
  line-height: 21px;
}
.details_box .left_box .class_info h3 {
  margin-bottom: 18px;
  line-height: 24px;
}
.details_box .left_box .class_info h3 i {
  float: left;
  width: 6px;
  height: 24px;
  background-color: #3d97f2;
  margin-right: 10px;
}
.details_box .left_box .class_info h3 span {
  float: left;
  font-size: 18px;
  font-weight: 600;
  color: #17233d;
}
.details_box .left_box .class_info .head_img {
  width: 85px;
  height: 85px;
  border-radius: 50%;
  overflow: hidden;
  margin-right: 38px;
}
.details_box .left_box .class_info .head_img img {
  display: block;
  width: 100%;
}
.details_box .left_box .class_info .tutor .right b {
  font-size: 16px;
  font-weight: 600;
  color: #515a6e;
}
.details_box .left_box .class_info .tutor .right span {
  font-size: 16px;
  color: #515a6e;
  margin-left: 18px;
}
.details_box .left_box .class_info .tutor .right .name {
  margin-bottom: 10px;
}
.details_box .left_box .class_info .tutor .introduction {
  width: 610px;
}
.details_box .left_box .class_catalog {
  padding-left: 24px;
  /* padding-top: 40px; */
  padding-bottom: 40px;
}
.details_box .left_box .img_box {
  /* padding-top: 38px; */
}
.details_box .left_box .img_box img {
  width: 92%;
  margin-left: 32px;
  float: left;
}
.details_box .left_box .class_catalog .catalog_box {
  margin-bottom: 30px;
}
.details_box .left_box .class_catalog .catalog_box h3 {
  font-weight: 600;
  font-size: 18px;
  letter-spacing: 1px;
  color: #17233d;
  line-height: 18px;
}
.details_box .left_box .class_catalog .catalog_box h3 .num {
  margin-right: 15px;
}
.details_box .left_box .class_catalog .catalog_box .class_hour {
  padding-left: 16px;
}
.details_box .left_box .class_catalog .catalog_box .class_hour h4 {
  margin-top: 22px;
  line-height: 14px;
  letter-spacing: 1px;
  color: #515a6e;
  margin-bottom: 11px;
}
.details_box .left_box .class_catalog .catalog_box .class_hour h4 .num {
  margin-right: 10px;
}
.details_box .left_box .class_catalog .catalog_box .class_hour .item_box > div {
  width: 733px;
  height: 36px;
  border-radius: 4px;
  border: solid 1px #dcdee2;
  line-height: 36px;
  padding: 0 22px;
  margin-bottom: 12px;
  margin-top: 18px;
}
.details_box .left_box .class_catalog .catalog_box .class_hour .item_box > div span {
  height: 24px;
  line-height: 24px;
  background: #3d97f2;
  border-radius: 4px;
  padding: 0 16px;
  color: #fff;
  margin-top: 5px;
  cursor: pointer;
  margin-right: 24px;
}
.details_box .left_box .class_catalog .catalog_box .class_hour .item_box > div i {
  width: 20px;
  height: 14px;
  background: url(../img/play_ioc.png) no-repeat;
  background-size: 100% 100%;
  margin-top: 10px;
  margin-right: 24px;
}
.details_box .right_box {
  width: 364px;
  /* padding: 0 24px; */
}
.details_box .right_box.fixed{
  position: fixed;
  top: 96px;
}
.details_box .right_box .right_box_item{
  padding: 26px 72px 30px 24px;
  background: #fff;
  margin-bottom: 24px;
}
.details_box .right_box .right_box_item:last-child{
  margin-bottom: 0;
}
.details_box .right_box h3 {
  /* margin-top: 25px; */
  margin-bottom: 20px;
  line-height: 24px;
}
.details_box .right_box .right_box_item p{
	/* width: 268px;
	height: 77px; */
	/* font-family: MicrosoftYaHei; */
	font-size: 14px;
	/* font-weight: normal;
	font-stretch: normal; */
	line-height: 20px;
	/* letter-spacing: 0px; */
	color: #515a6e;
}
.details_box .right_box .right_box_item.item_one{
  background: url('../img/item_one_bg.png') no-repeat center center;
  background-size: 100% 100%;
}
.details_box .right_box .right_box_item.item_two{
  background: url('../img/item_two_bg.png') no-repeat center center;
  background-size: 100% 100%;
}
.details_box .right_box .right_box_item.item_three{
  background: url('../img/item_three_bg.png') no-repeat center center;
  background-size: 100% 100%;
}
.details_box .right_box h3 i {
  float: left;
  width: 6px;
  height: 24px;
  background-color: #3d97f2;
  margin-right: 10px;
}
.details_box .right_box h3 span {
  float: left;
  font-size: 18px;
  font-weight: 600;
  color: #17233d;
}
.details_box .right_box .item {
  position: relative;
  overflow: hidden;
  width: 100%;
  border: solid 1px #ebedf0;
  padding-left: 16px;
  margin-bottom: 21px;
}
.details_box .right_box .item .title {
  padding-top: 20px;
  margin-bottom: 11px;
  font-size: 16px;
  font-weight: 600;
  color: #17233d;
  line-height: 16px;
}
.details_box .right_box .item p {
  font-size: 12px;
  line-height: 18px;
  width: 197px;
}
.details_box .right_box .item a {
  display: inline-block;
  height: 32px;
  width: 80px;
  line-height: 32px;
  text-align: center;
  border: solid 1px #3d97f2;
  border-radius: 4px;
  margin-top: 11px;
  margin-bottom: 15px;
}
.details_box .right_box .item img {
  position: absolute;
  right: -20px;
  top: 9px;
}