header{
  min-height: 800px;
}
#key {
  z-index: 2;
}
#key:before{
  height: calc(100% - 100px);
}
#key .slide {
  height: 620px;
}
#key .slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
#key .slick-arrow {
  position: absolute;
  bottom: -85px;
  width: 34px;
  height: 54px;
  text-indent: -9999px;
  border: none;
  z-index: 9999;
  cursor: pointer;
}
#key .slick-arrow:hover {
  opacity: 0.7;
}
#key .slick-next {
  background: url("../img/works_details/btn_next.png") no-repeat center top/cover;
  right: 0;
}
#key .slick-prev {
  background: url("../img/works_details/btn_prev.png") no-repeat center top/cover;
  right: 260px;
}
#sec1 {
  margin-top: -120px;
  padding-bottom: 110px;
}
#sec1 h2 {
  font-size: 24px;
  letter-spacing: 2.6px;
  padding: 40px 0 60px;
}
#sec1 .block .txt {
  width: 355px;
  line-height: 31px;
  float: left;
}
#sec1 .block .txt p {
  padding-bottom: 30px;
}
#sec1 .block .sec1_img {
  width: 736px;
  float: right;
  padding-top: 10px;
}
#sec1 .block .sec1_img p {
  float: left;
}
#sec1 .block .sec1_img .img2 {
  float: right;
}
#sec1 .block .sec1_img .img3 {
  margin-top: 65px;
}
#sec1 .btn_01 {
  margin-top: 105px;
}
@media only screen and (min-width:769px) and (max-width:1200px) {
  #sec1 .block .txt {
    width: 300px;
  }
  #sec1 .block .sec1_img {
    width: calc(100% - 320px);
  }
  #sec1 .block .sec1_img .img1 {
    width: 48%;
  }
  #sec1 .block .sec1_img .img2 {
    width: 48%;
  }
  #sec1 .block .sec1_img .img3 {
    width: 100%;
    margin-top: 30px;
  }
}
@media only screen and (max-width:768px) {
  header{
    min-height: 100vh;
  }
  #key {
    position: static;
    padding: 40px 30px;
  }
  #key h3 {
    font-size: 24px;
    padding: 60px 0 15px;
  }
  #key .slide {
    height: auto;
    margin-top: 15px;
  }
  #sec1 {
    margin-top: 0;
    padding-bottom: 80px;
  }
  #sec1 .block .txt {
    float: none;
    width: auto;
  }
  #sec1 .block .txt p {
    padding-bottom: 15px;
  }
  #sec1 .block .sec1_img {
    width: auto;
    padding-top: 15px;
  }
  #sec1 .block .sec1_img p {
    float: none;
    margin-bottom: 30px;
    text-align: center;
  }
  #sec1 .block .sec1_img .img2 {
    float: none;
  }
  #sec1 .block .sec1_img .img3 {
    margin-top: 30px;
    margin-top: 0;
  }
  #sec1 .btn_01 {
    margin-top: 35px;
  }
}