.ctn1 {
  padding-top: 20px;
  background: url(../img/about/bg1.jpg) no-repeat;
  background-size: cover;
  overflow: hidden;
}
.ctn1 .con {
  position: relative;
}
.ctn1 .con .tu {
  width: 34.6%;
  margin: 0 auto;
}
.ctn1 .con .tu img {
  width: 100%;
}
.ctn1 .con .text {
  position: absolute;
  width: 694px;
  max-width: 100%;
  left: 50%;
  top: 46%;
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  -moz-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  text-align: center;
}
.ctn1 .con .text p {
  color: #666;
  line-height: 1.8;
  margin-top: 20px;
}
.ctn2 {
  padding: 100px 0 120px;
  overflow: hidden;
}
.ctn2 .con {
  position: relative;
}
.ctn2 .con .left {
  width: 53.5%;
}
.ctn2 .con .left .text p {
  color: #666;
  text-align: justify;
  line-height: 1.8;
  margin-top: 30px;
}
.ctn2 .con .left .tu {
  border-radius: 20px;
  margin-top: 50px;
  overflow: hidden;
}
.ctn2 .con .left .tu img {
  width: 100%;
  transition: all 0.5s;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
}
.ctn2 .con .left .tu:hover img {
  transform: scale(1.05);
  -webkit-transform: scale(1.05);
  -moz-transform: scale(1.05);
  -ms-transform: scale(1.05);
}
.ctn2 .con .right {
  position: absolute;
  width: 37.7%;
  height: 100%;
  right: 0;
  top: 0;
}
.ctn2 .con .right ul {
  width: 100%;
  height: 100%;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
}
.ctn2 .con .right ul li {
  height: 16.666%;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  width: 100%;
}
.ctn2 .con .right ul li .center {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.ctn2 .con .right ul li .center .nums {
  display: flex;
}
.ctn2 .con .right ul li .center .nums h2 {
  font-size: 60px;
  font-family: 'Arial';
  letter-spacing: -3px;
  line-height: 1;
}
.ctn2 .con .right ul li .center .nums .sign {
  font-size: 60px;
  font-family: 'Arial';
  letter-spacing: -3px;
  line-height: 1;
}
.ctn2 .con .right ul li .center .nums .jia {
  margin-left: 4px;
  line-height: 1;
}
.ctn2 .con .right ul li .center p {
  color: #666;
}
.ctn3 {
  padding: 80px 0;
 /* background: url(../img/about/bg2.jpg) no-repeat;
  background-size: cover;*/
  overflow: hidden;
  position: relative;
  z-index: 2;
}
.ctn3 .ctn-list {
  margin-top: 14px;
}
.ctn3 .ctn-list ul {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
}
.ctn3 .ctn-list ul li {
  margin-top: 46px;
  width: 47.5%;
  background: #fff;
  border-radius: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  overflow: hidden;
}
.ctn3 .ctn-list ul li .left {
  width: 38.3%;
  height: 388px;
  border-radius: 20px;
  overflow: hidden;
 background: url(../img/about/xian.jpg) no-repeat;
  background-size: cover;
  position: relative;
  padding: 20px;
}
.ctn3 .ctn-list ul li .left h3 {
  font-family: 'Arial';
  letter-spacing: -1px;
  opacity: 0.5;
}
.ctn3 .ctn-list ul li .left h2 {
  position: absolute;
  width: 100%;
  left: 0;
  bottom: 0;
  padding: 20px;
  transition: all 0.5s;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
}
.ctn3 .ctn-list ul li .right {
  width: 61.7%;
  height: 80%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.ctn3 .ctn-list ul li .right .tu {
  width: 80%;
  -webkit-box-reflect: below 0 linear-gradient(to top, rgba(0, 0, 0, 0.3), transparent 20%);
  display: flex;
  justify-content: center;
}
.ctn3 .ctn-list ul li .right .tu img {
  max-width: 100%;
  max-height: 100%;
}
.ctn3 .ctn-list ul li:hover .left h2 {
  color: var(--color);
}
.ctn4 {
  padding-bottom: 120px;
  overflow: hidden;
  position: relative;
  z-index: 3;
}
.ctn4 .con {
  position: relative;
}
.ctn4 .con .tu {
  border-radius: 20px;
  overflow: hidden;
}
.ctn4 .con .tu img {
  width: 100%;
}
.ctn4 .con .text {
  position: absolute;
  width: 90%;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  -moz-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  color: #fff;
  text-align: center;
}
.ctn4 .con .text p {
  margin: 14px 0 24px;
}
.ctn4 .con .text a {
  color: #fff;
  position: relative;
  display: inline-block;
}
.ctn4 .con .text a:after {
  content: '';
  width: 0;
  height: 1px;
  background: #fff;
  position: absolute;
  left: 50%;
  bottom: 0;
  transition: all 0.5s;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
}
.ctn4 .con .text a span {
  margin-left: 4px;
}
.ctn4 .con .text a:hover:after {
  width: 100%;
  left: 0;
}
.big-box{
    position: relative;
}
.big-box .bg{
    position:absolute;
    width: 100%;
    left:0;
    bottom:0;
    z-index: 1;
    opacity: 0.1;
}
.big-box .bg img{
    width: 100%;
}
.big-box .bg1{
    position:absolute;
    width: 100%;
    left:0;
    top:0;
    z-index: 0;
}
.big-box .bg1 img{
    width: 100%;
}
@media screen and (max-width: 1680px) {
  .ctn2 {
    padding: 5vw 0 6vw;
  }
  .ctn2 .con .left .text p {
    margin-top: 1.5vw;
  }
  .ctn2 .con .left .tu {
    margin-top: 2.5vw;
  }
  .ctn2 .con .right ul li .center .nums h2 {
    font-size: 3vw;
  }
  .ctn2 .con .right ul li .center .nums .sign {
    font-size: 3vw;
  }
  .ctn3 {
    padding: 4vw 0;
  }
  .ctn3 .ctn-list {
    margin-top: 10px;
  }
  .ctn3 .ctn-list ul li {
    margin-top: 36px;
  }
  .ctn3 .ctn-list ul li .left {
    height: 23vw;
  }
  .ctn4 {
    padding-bottom: 6vw;
  }
  .ctn4 .con .text p {
    margin: 10px 0 20px;
  }
}
@media screen and (max-width: 1200px) {
  .ctn2 .con .left .text p {
    line-height: 1.6;
  }
  .ctn2 .con .right ul li .center .nums h2 {
    letter-spacing: -2px;
  }
  .ctn2 .con .right ul li .center .nums .sign {
    letter-spacing: -2px;
  }
  .ctn3 .ctn-list {
    margin-top: 0;
  }
  .ctn3 .ctn-list ul li {
    margin-top: 30px;
  }
}
@media screen and (max-width: 768px) {
  .ctn1 .con .tu {
    width: 80%;
  }
  .ctn1 .con .text p {
    margin-top: 14px;
    line-height: 1.6;
  }
  .ctn2 {
    padding: 40px 0;
  }
  .ctn2 .con .left {
    width: 100%;
  }
  .ctn2 .con .left .text p {
    margin-top: 14px;
  }
  .ctn2 .con .left .tu {
    border-radius: 10px;
    margin-top: 20px;
  }
  .ctn2 .con .right {
    width: 100%;
    position: relative;
    margin-top: 30px;
  }
  .ctn2 .con .right ul li {
    padding: 14px 0;
  }
  .ctn2 .con .right ul li .center .nums h2 {
    font-size: 30px;
  }
  .ctn2 .con .right ul li .center .nums .sign {
    font-size: 30px;
  }
  .ctn3 {
    padding: 40px 0;
  }
  .ctn3 .ctn-list {
    margin-top: 30px;
  }
  .ctn3 .ctn-list ul {
    display: block;
  }
  .ctn3 .ctn-list ul li {
    width: 100%;
    margin-top: 14px;
    border-radius: 10px;
    padding: 10px;
  }
  .ctn3 .ctn-list ul li .left {
    height: 200px;
    border-radius: 10px;
    padding: 10px;
  }
  .ctn3 .ctn-list ul li .left h2 {
    padding: 10px;
  }
  .ctn4 {
    padding-bottom: 40px;
  }
  .ctn4 .con .tu {
    border-radius: 10px;
    height: 200px;
  }
  .ctn4 .con .tu img {
    height: 100%;
    object-fit: cover;
  }
  .ctn4 .con .text p {
    margin: 10px 0 14px;
  }
}