.banner {
  position: relative;
  width: 100%;
}
.banner img {
  width: 100%;
  height: auto;
}
.main {
  font-family: Source Han Sans CN;
  font-weight: 400;
}
.main li {
  list-style: none;
}
.main .main1 {
  margin-top: 90px;
}
.main .main1 .tab_list {
  overflow: hidden;
}
.main .main1 .tab_list .tab_btm_border {
  float: left;
  position: relative;
}
.main .main1 .tab_list .tab_btm_border span {
  position: absolute;
  left: 0;
  bottom: 0;
  border: 1px solid #FE3B1B;
  width: 26px;
}
.main .main1 .tab_list ul {
  position: relative;
  width: 224px;
  display: flex;
}
.main .main1 .tab_list ul li {
  position: relative;
  width: 20%;
  padding: 10px 0;
  cursor: pointer;
  font-size: 14px;
  font-weight: 400;
  color: #999999;
}
.main .main1 .tab_list ul li.tab_activ {
  color: #FE3B1B;
}
.main .main1 .tab_list ul::after {
  content: "";
  position: absolute;
  border: 1px solid #999999;
  height: 1px;
  width: 100%;
  left: 0;
  bottom: 0;
}
.main .main1 .tab_list .tab_btn {
  float: right;
}
.main .main1 .tab_list .tab_btn span {
  cursor: pointer;
  width: 14px;
  height: 13px;
  font-size: 26px;
  font-weight: bold;
  color: #999999;
  line-height: 35px;
  margin-right: 25px;
}
.main .main1 .tab_list .tab_btn span.active_btn {
  color: #3E3E3F;
}
.main .main1 .tab_main {
  position: relative;
  padding-bottom: 29px;
}
.main .main1 .tab_main::after {
  content: "";
  position: absolute;
  bottom: 0;
  right: 0;
  width: 600px;
  height: 1px;
  background: #000000;
}
.main .main1 .tab_main .tab_main_title {
  min-width: 155px;
  margin: 110px 0 83px 68px;
  position: relative;
  height: 20px;
  font-size: 20px;
  font-family: Microsoft YaHei;
  font-weight: bold;
  color: #0133C3;
  display: inline-block;
}
.main .main1 .tab_main .tab_main_title::before {
  content: "";
  position: absolute;
  left: -64px;
  top: 0;
  background: url(../images/about_us/main_logo.png);
  width: 54px;
  height: 28px;
  background-size: 100%;
  top: -4px;
}
.main .main1 .tab_main .tab_main_title::after {
  content: "";
  position: absolute;
  bottom: -18px;
  width: 656px;
  height: 1px;
  background: #2C8DD1;
  right: 0;
}
.main .main1 .tab_main .tab_lists {
  height: 610px;
  position: relative;
}
.main .main1 .tab_main .tab_lists .tab_main_cont {
  overflow: hidden;
  position: absolute;
  background: white;
  z-index: 0;
}
.main .main1 .tab_main .tab_lists .tab_main_cont.activ_sty1 {
  z-index: 1;
}
.main .main1 .tab_main .tab_lists .tab_main_cont.activ_sty1 .tab_main_left span {
  margin-left: 0px;
  transition: all 0.5s ease 0s;
}
.main .main1 .tab_main .tab_lists .tab_main_cont.activ_sty1 .tab_main_left .tab_main_txt {
  margin-left: 0px;
  transition: all 0.8s ease 0.5s;
  text-align: justify;
}
.main .main1 .tab_main .tab_lists .tab_main_cont.activ_sty1 img {
  opacity: 1;
  transition: all 2s ease 0s;
}
.main .main1 .tab_main .tab_lists .tab_main_cont .tab_main_left {
  position: relative;
  width: 228px;
  padding: 25px 32px 25px 18px;
  float: left;
}
.main .main1 .tab_main .tab_lists .tab_main_cont .tab_main_left span {
  margin-left: -248px;
  display: block;
  color: #666666;
  line-height: 20px;
  font-size: 12px;
}
.main .main1 .tab_main .tab_lists .tab_main_cont .tab_main_left .tab_main_txt {
  margin-left: -248px;
  margin-top: 64px;
  font-size: 14px;
  color: #333333;
  font-weight: 400;
  line-height: 24px;
  width: 228px;
}
.main .main1 .tab_main .tab_lists .tab_main_cont img {
  float: right;
  width: 922px;
  height: 610px;
  opacity: 0;
}
.main .main2 .main2_title {
  height: 38px;
  font-size: 40px;
  font-family: Source Han Sans CN;
  font-weight: 400;
  padding-left: 20px;
  margin: 100px 0 30px 0;
}
.main .main2 .main2_title a {
  color: #345CCF;
}
.main .main2 .main2_cont {
  display: flex;
}
.main .main2 .main2_cont .main2_cont_left {
  width: 228px;
  padding: 0 30px 0 20px;
  font-size: 14px;
  color: #333333;
  line-height: 24px;
}
.main .main2 .main2_cont .main2_cont_rigth {
  width: 922px;
  display: flex;
  justify-content: space-between;
  text-align: center;
}
.main .main2 .main2_cont .main2_cont_rigth img {
  margin-bottom: 15px;
}
.main .main2 .main2_cont .main2_cont_rigth p {
  font-size: 16px;
  color: #3E3E3F;
}
.main .main3 {
  margin-bottom: 383px;
}
.main .main3 .tab_main_title {
  min-width: 155px;
  margin: 110px 0 83px 68px;
  position: relative;
  height: 20px;
  font-size: 20px;
  font-family: Microsoft YaHei;
  font-weight: bold;
  color: #0133C3;
  display: inline-block;
}
.main .main3 .tab_main_title::before {
  content: "";
  position: absolute;
  left: -64px;
  top: 0;
  background: url(../images/about_us/main_logo.png);
  width: 54px;
  height: 28px;
  background-size: 100%;
  top: -4px;
}
.main .main3 .tab_main_title::after {
  content: "";
  position: absolute;
  bottom: -18px;
  width: 656px;
  height: 1px;
  background: #2C8DD1;
  right: 0;
}
.main .main3 .main3_cont {
  position: relative;
  width: 1178px;
  padding-left: 22px;
}
.main .main3 .main3_cont .main3_tab {
  display: flex;
  justify-content: space-between;
}
.main .main3 .main3_cont .main3_tab li {
  /* border: 1px dashed black; */
  position: relative;
  cursor: pointer;
}
.main .main3 .main3_cont .main3_tab li img {
  height: 269px;
  width: 100%;
  vertical-align: middle;
}
.main .main3 .main3_cont .main3_tab li.mask::before {
  content: "";
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  background: rgba(255, 255, 255, 0.8);
}
.main .main3 .main3_tab_cont {
  background: white;
  position: absolute;
  right: 0;
  top: 190px;
  width: 1087px;
  height: 300px;
  box-shadow: 0px 0px 12px 0px rgba(62, 62, 63, 0.75);
  z-index: 2;
}
.main .main3 .main3_tab_cont .main3_tab_card {
  opacity: 0;
  position: absolute;
  background: white;
  padding: 40px 0 0 87px;
  z-index: 0;
}
.main .main3 .main3_tab_cont .main3_tab_card.activ_sty2 {
  z-index: 1;
  opacity: 1;
  transition: all 1s ease 0s;
}
.main .main3 .main3_tab_cont .main3_tab_card p {
  line-height: 65px;
  font-size: 36px;
  font-weight: 400;
  color: #666666;
}
.main .main3 .main3_tab_cont .main3_tab_card .name {
  font-size: 24px;
  font-weight: 400;
  color: #3E3E3F;
  margin: 44px 0 8px 0;
}
.main .main3 .main3_tab_cont .main3_tab_card .data {
  font-size: 16px;
  font-weight: 400;
  color: #999999;
}
.main .main3 .main3_next_btn {
  position: absolute;
  /* right: 0;
  top: 90px; */
  right: 143px;
  top: 260px;
  cursor: pointer;
  z-index: 3;
}
.main .main3 .main3_next_btn img{
  width: 55px;
  height: 94px;
}
.main .main4 .main4_title {
  width: 600px;
  height: 82px;
  font-size: 48px;
  font-weight: 400;
  color: #0133C3;
  text-align: center;
  border-bottom: 1px solid #2C8DD1;
  margin: 0 auto;
}
.main .main4 .main4_title span {
  padding-left: 20px;
  position: relative;
}
.main .main4 .main4_title span::before {
  content: "";
  position: absolute;
  left: -64px;
  top: 20px;
  background: url(../images/about_us/main_logo.png);
  width: 54px;
  height: 28px;
  background-size: 100%;
}
.main .main4 .mask_content {
  display: flex;
  margin-bottom: 140px;
  overflow: hidden;
  padding-right: 20px;
}
.main .main4 .mask_content .mask_item {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  width: 25%;
  position: relative;
  margin-top: 122px;
}
.main .main4 .mask_content .mask_item .number {
  font-size: 48px;
  font-weight: 400;
  margin-bottom: 40px;
  position: relative;
}
.main .main4 .mask_content .mask_item .number .unit {
  position: absolute;
  top: -7px;
  right: -35px;
  font-size: 18px;
  font-weight: 400;
  color: #666666;
}
.main .main4 .mask_content .mask_item .mini_font {
  font-weight: 400;
  font-size: 14px;
  color: #666666;
}
.main .main4 .mask_content .mask_item .advantage {
  font-size: 18px;
  margin-bottom: 12px;
  font-weight: 400;
}
.main .main4 .mask_content .mask_item .arrows {
  position: absolute;
  top: 100%;
  right: -14px;
  background: url(../images/about_us/main4_img.png);
  height: 95px;
  width: 29px;
}
.main .main4 .mask_content .mask_item:nth-child(1) .number .unit {
  font-size: 24px!important;
}