.all {
  padding: 4.5% 0;
}

.institute .tit {
  line-height: 1;
  margin-top: 60px;
}
.institute .des {
  margin-top: 20px;
  line-height: 2;
  color: #222222;
}

.work {
  margin-top: 5.9%;
}

.case {
  margin-top: 5.9%;
}

.repeat {
  margin-top: 60px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
}
.repeat div {
  width: calc((100% - 60px) / 3);
  margin-right: 30px;
}
.repeat div:nth-child(3n) {
  margin-right: 0;
}
.repeat div:nth-child(n+4) {
  margin-top: 60px;
}
.case .img{
     position: relative;
  height: 0;
  padding-bottom: 63%;
  overflow: hidden;
  display: block;
  -webkit-transition: 0.5s;
  transition: 0.5s;
  margin-bottom: 12px;
  background: #f5f5f5; 
 
}
.repeat .img {
  position: relative;
  height: 0;
  padding-bottom: 63%;
  overflow: hidden;
  display: block;
  -webkit-transition: 0.5s;
  transition: 0.5s;
  margin-bottom: 12px;
  background: #f5f5f5;
   border: 1px solid #f5f5f5;
}
.repeat .img img {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
  -o-object-fit: cover;
     object-fit: cover;
}
.repeat .img:hover{
box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.1);
        border: 1px solid #eee;
}
.repeat .repeat_tit {
  color: #222222;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
}
.repeat .repeat_tit:hover {
  color: #f00000;
}

.case .sw{
    position: relative;
    margin-top: 60px;
}
.case .img img {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
  -o-object-fit: cover;
     object-fit: cover;
}
.repeat .img:hover img {
  -webkit-transform: scale(1.05);
      -ms-transform: scale(1.05);
          transform: scale(1.05);
}
.case .img:hover {
  -webkit-box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.2);
          box-shadow: 0 0 10px 0 rgba(0, 0, 0, 0.2);
}  
.case .repeat_tit {
  color: #222222;
  -webkit-transition: all 0.5s;
  transition: all 0.5s;
}
.case .repeat_tit:hover {
  color: #f00000;
}
.case .point{
    display: none;
    margin-top: 20px;
}
.case .prev{
    left: -55px;
}
.case .next{
    right: -55px;
}
@media screen and (max-width: 1600px) {
  .institute .tit {
    margin-top: 35px;
  }
  .institute .des {
    margin-top: 15px;
  }
  .repeat {
    margin-top: 35px;
  }
  .repeat div:nth-child(n+4) {
    margin-top: 30px;
  }
  .repeat div {
    width: calc((100% - 40px) / 3);
    margin-right: 20px;
  }
  .case .sw{
    margin-top: 35px;
}
}
@media screen and (max-width: 1200px) {
      .institute .tit {
    margin-top: 25px;
  }
  .institute .des {
    margin-top: 10px;
  }
  .repeat {
    margin-top: 25px;
  }
  .repeat div {
    width: calc((100% - 30px) / 3);
    margin-right: 15px;
  }
  .case .prev {
    left: -40px;
  }
  .case .next {
    right: -40px;
  }
    .case .sw{
    margin-top: 25px;
}
}
@media screen and (max-width: 768px) {
  .all {
    padding: 40px 0;
  }
  .institute .tit {
    margin-top: 30px;
  }
  .work {
    margin-top: 30px;
  }
  .case {
    margin-top: 30px;
  }
  .repeat {
    -webkit-box-pack: justify;
        -ms-flex-pack: justify;
            justify-content: space-between;
  }
  .repeat div {
    width: calc((100% - 15px) / 2);
    margin-right: 0px;
  }
  .repeat div:nth-child(n+3) {
    margin-top: 20px;
  }
    .sw_clk {
        display: none;
    }
    .case .point{
        display: flex;
        justify-content: center;
    }
}
@media screen and (max-width: 500px) {
  .repeat div {
    width: 100%;
  }
  .repeat div:nth-child(n+2) {
    margin-top: 20px;
  }
}