.ctn1 {
  padding: 76px 0 80px;
}
.ctn1 .introduce {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  margin-top: 40px;
  margin-bottom: 60px;
}
.ctn1 .img {
  width: 47.5%;
  overflow: hidden;
}
.ctn1 .img img {
  width: 100%;
  height: 100%;
  -o-object-fit: cover;
     object-fit: cover;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
}
.ctn1 .img:hover img {
  -webkit-transform: scale(1.05);
      -ms-transform: scale(1.05);
          transform: scale(1.05);
}
.ctn1 .introduce_txt {
  width: 52.5%;
  background: #f4f6f8;
  padding: 50px 70px;
}
.ctn1 .introduce_tit {
  font-weight: bold;
  margin-bottom: 30px;
}
.ctn1 li:nth-child(n+2) {
  margin-top: 24px;
}
.ctn1 .intro_top {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  white-space: nowrap;
  color: #c9151e;
  font-weight: bold;
  margin-right: 10px;
}
.ctn1 .intro_top img {
  margin-right: 15px;
}
.ctn1 .intro_des {
  color: #666666;
  margin-top: 6px;
}
.ctn1 .icon {
  height: 57px;
}
.ctn1 .ctn1_tit {
  font-weight: bold;
  margin-top: 12px;
  margin-bottom: 12px;
}
.ctn1 .ctn1_des {
  color: #999999;
}
.ctn1 .ctn1_flx {
  margin-top: 35px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
}
.ctn1 .ctn1_flx > div {
  padding: 40px;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
  position: relative;
  top: 0;
  background: #f8f9fb;
  -webkit-box-shadow: 16px 16px 20px 0 rgb(234, 237, 244);
          box-shadow: 16px 16px 20px 0 rgb(234, 237, 244);
  width: 32%;
}
.ctn1 .ctn1_flx > div:hover {
  top: -10px;
}
.ctn1 .ctn1_flx > div:nth-child(n+4) {
  margin-top: 2%;
}
.ctn1 .ctn1_flx > div:nth-child(3n-1) {
  margin-left: 2%;
  margin-right: 2%;
}

.ctn2 {
  padding: 62px 0 90px;
  background: #f7f8f9;
  background-size: cover;
  background-image: url(../img/case/bg2.jpg);
}
.ctn2 .ctn2_list {
  margin-top: 44px;
}
.ctn2 li {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: baseline;
      -ms-flex-align: baseline;
          align-items: baseline;
  padding: 18px 38px;
  font-weight: bold;
  background: white;
}
.ctn2 li:nth-child(n+2) {
  margin-top: 10px;
}
.ctn2 li img {
  margin-right: 14px;
}
.ctn2 li > div {
  width: calc(100% - 25px);
}
.ctn2 .ctn2_img {
  background: white;
  padding: 52px;
  margin-top: 36px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
}
.ctn2 .ctn2_img img {
  max-width: 100%;
}

.ctn3 {
  padding: 84px 0 100px;
}
.ctn3 .ctn3_flx {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  margin-top: 42px;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
}
.ctn3 li {
  font-weight: bold;
  background-size: cover;
  background-image: url(../img/case/bg3.jpg);
  text-align: center;
  width: calc((100% - 40px) / 3);
  height: 204px;
  padding: 34px 20px 0;
  margin-right: 20px;
  -webkit-box-shadow: 0 0 20px 0 #eaedf4;
          box-shadow: 0 0 20px 0 #eaedf4;
  position: relative;
  top: 0;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
}
.ctn3 li:nth-child(3n) {
  margin-right: 0;
}
.ctn3 li:hover {
  top: -10px;
}
.ctn3 .ctn_tit {
  color: #c9151e;
}
.ctn3 .ctn_des {
  margin-top: 15px;
}

@media only screen and (max-width: 1600px) {
  .ctn1 .introduce_txt {
    padding: 40px 55px;
  }
  .ctn1 li:nth-child(n+2) {
    margin-top: 15px;
  }
  .ctn1 .introduce_tit {
    margin-bottom: 25px;
  }
  .ctn1 {
    padding: 3.95vw 0 4.16vw;
  }
  .ctn1 .introduce {
    margin-bottom: 3.125vw;
    margin-top: 2.08vw;
  }
  .ctn1 {
    padding: 3.95vw 0 4.16vw;
  }
  .ctn2 {
    padding: 3.22vw 0 4.6875vw;
  }
  .ctn3 {
    padding: 4.375vw 0 5.2vw;
  }
  .ctn2 .ctn2_list {
    margin-top: 2.29vw;
  }
  .ctn3 .ctn3_flx {
    margin-top: 2.1875vw;
  }
  .ctn1 .ctn1_flx {
    margin-top: 1.82vw;
  }
}
@media only screen and (max-width: 768px) {
  .ctn1 {
    padding: 40px 0;
  }
  .ctn2 {
    padding: 40px 0;
  }
  .ctn1 .introduce {
    display: block;
  }
  .ctn1 .img {
    width: 100%;
  }
  .ctn1 .introduce_txt {
    width: 100%;
  }
  .ctn1 .introduce_txt {
    padding: 25px 20px;
  }
  .ctn1 .introduce_tit {
    margin-bottom: 20px;
  }
  .ctn1 li:nth-child(n+2) {
    margin-top: 10px;
  }
  .ctn1 .introduce {
    margin: 25px auto 30px;
  }
  .ctn1 .ctn1_flx > div {
    width: 100%;
    margin-bottom: 20px;
    padding: 25px;
  }
  .ctn1 .ctn1_flx > div:last-child {
    margin-bottom: 0;
  }
  .ctn1 .ctn1_flx > div:nth-child(3n-1) {
    margin-left: 0;
    margin-right: 0;
  }
  .ctn1 .ctn1_flx {
    margin-top: 25px;
  }
  .ctn2 li {
    padding: 15px 20px;
  }
  .ctn2 .ctn2_list {
    margin-top: 25px;
  }
  .ctn2 .ctn2_img {
    margin-top: 20px;
  }
  .ctn3 {
    padding: 40px 0;
  }
  .ctn3 li {
    width: 100%;
    margin-right: 0;
    height: 160px;
    padding: 30px 20px 0;
  }
  .ctn3 li:nth-child(n+2) {
    margin-top: 20px;
  }
  .ctn3 .ctn3_flx {
    margin-top: 25px;
  }
}