#sec1 {
  padding: 40vw 0 15vw;
  background: url("../img/about/s1_deco.png") no-repeat bottom center/200% auto;
  text-align: center;
}
#sec1 h2 span {
  display: inline-block;
  border-top: 2px solid;
  border-bottom: 2px solid;
  padding: 3vw 0;
  font-size: 6vw;
  letter-spacing: 0.1em;
  line-height: 1.5;
}
#sec1 .txt {
  margin: 7vw 0 0;
}

.gr-content2 {
  margin: 10vw 0 0;
}
.gr-content2 h3 {
  text-align: center;
  margin: 0 0 5vw;
}
.gr-content2 table {
  border: 1px solid #b8b8b8;
  border-collapse: collapse;
  text-align: center;
  width: 100%;
  font-size: 15px;
}
.gr-content2 table tr td, .gr-content2 table tr th {
  border: 1px solid #b8b8b8;
  line-height: 1.5;
  padding: 20px 0;
  font-weight: bold;
  width: 50%;
  letter-spacing: 0.1em;
}

#sec2 {
  position: relative;
  padding: 0 0 20vw;
}
#sec2::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("../img/index/s4_deco_sp.png") no-repeat top center/100% auto, url("../img/index/s4_deco2_sp.png") no-repeat bottom center/100% auto;
}

#sec3 {
  position: relative;
  padding: 0 0 20vw;
}
#sec3::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("../img/index/s4_deco_sp.png") no-repeat top center/100% auto, url("../img/index/s4_deco2_sp.png") no-repeat bottom center/100% auto;
}

.titl4 {
  font-weight: 700;
  font-size: 7vw;
  line-height: 1.5;
  letter-spacing: 0.1em;
}
.titl4 small {
  display: block;
  font-weight: 400;
  font-size: 4vw;
  opacity: 0.75;
  margin: 2vw 0 0;
  letter-spacing: 0.04em;
}

#sec4 {
  position: relative;
  padding: 12vw 0 15vw;
}
#sec4::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  background: url("../img/about/s2_deco.png") no-repeat bottom right/150% auto;
}
#sec4 .inner {
  padding: 0 2.5%;
  position: relative;
  z-index: 2;
}
#sec4 .inner .left {
  margin: 0 0 7vw;
}
#sec4 .inner .left .txt {
  margin: 7vw 0 0;
}

#sec5 {
  position: relative;
  padding: 12vw 0 15vw;
}
#sec5::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  background: url("../img/about/s5_deco.png") no-repeat bottom left/150% auto;
}
#sec5 .inner {
  padding: 0 2.5%;
  position: relative;
  z-index: 2;
}
#sec5 .inner .left .txt {
  margin: 7vw 0 0;
}
#sec5 .inner .group-img {
  margin: 7vw 0 0 0;
}
#sec5 .inner .group-img .img {
  width: 80vw;
}
#sec5 .inner .group-img .img2 {
  margin: 7vw 0 0 45%;
  text-align: right;
}

@media screen and (min-width: 768px) {
  #sec1 {
    padding: 205px 0 108px;
    background: url("../img/about/s1_deco.png") no-repeat bottom center;
  }
  #sec1 h2 span {
    padding: 14px 0 18px;
    font-size: 37px;
    letter-spacing: 0.18em;
    line-height: 60px;
  }
  #sec1 .txt {
    margin: 53px 0 0;
    letter-spacing: 0.12em;
  }

  .gr-content2 {
    margin: 69px 0 0;
  }
  .gr-content2 h3 {
    margin: 0 0 21px;
  }
  .gr-content2 table {
    font-size: 20px;
  }
  .gr-content2 table tr td, .gr-content2 table tr th {
    padding: 25px 0;
    width: 498px;
  }

  #sec2 {
    padding: 164px 0 142px;
  }
  #sec2::before {
    background: url("../img/index/s3_deco.png") no-repeat top center, url("../img/about/s2_deco.png") no-repeat bottom center;
  }
  #sec2 .gr-content {
    min-height: 345px;
  }

  #sec3 {
    padding: 169px 0 142px;
  }
  #sec3::before {
    background: url("../img/index/s3_deco.png") no-repeat top center, url("../img/about/s2_deco.png") no-repeat bottom center;
  }
  #sec3 .flex-item {
    width: 1200px;
  }

  .titl4 {
    font-size: 48px;
    letter-spacing: 0.2em;
  }
  .titl4 small {
    font-size: 20px;
    margin: 6px 0 0;
  }

  #sec4 {
    padding: 110px 0 164px;
  }
  #sec4::before {
    background: url("../img/about/s2_deco.png") no-repeat bottom center;
  }
  #sec4 .inner {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: start;
        -ms-flex-align: start;
            align-items: flex-start;
    margin: 0 auto;
    padding: 0 20px;
    max-width: 1068px;
    align-items: flex-start;
  }
  #sec4 .inner .left {
    width: 480px;
    margin: 0;
  }
  #sec4 .inner .left .txt {
    margin: 46px -10px 0 0;
    letter-spacing: 0;
  }
  #sec4 .inner .img {
    margin: 18px 0 0 74px;
  }

  #sec5 {
    padding: 134px 0 178px;
  }
  #sec5::before {
    background: url("../img/about/s5_deco.png") no-repeat bottom center;
  }
  #sec5 .inner {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: start;
        -ms-flex-align: start;
            align-items: flex-start;
    -webkit-box-orient: horizontal;
    -webkit-box-direction: reverse;
        -ms-flex-direction: row-reverse;
            flex-direction: row-reverse;
    margin: 0 auto;
    padding: 0 20px;
    max-width: 1200px;
    -webkit-box-pack: end;
        -ms-flex-pack: end;
            justify-content: flex-end;
  }
  #sec5 .inner .left {
    width: 480px;
  }
  #sec5 .inner .left .txt {
    margin: 47px -10px 0 0;
    letter-spacing: 0;
  }
  #sec5 .inner .group-img {
    margin: 40px 87px 0 0;
    width: 533px;
  }
  #sec5 .inner .group-img .img {
    width: auto;
  }
  #sec5 .inner .group-img .img2 {
    margin: 41px 0 0;
  }
}
@media screen and (min-width: 1450px) {
  #sec4 .inner .left .txt, #sec5 .inner .left .txt {
    letter-spacing: 0.1em;
    margin-right: 0;
  }
}