#sec1 {
  padding-top: var(--spc-md);
  background: #F5F5F5;
  position: relative;
  z-index: 0;
}
#sec1::before {
  content: "";
  height: 50vw;
  background: #fff;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: -1;
}
#sec1 .imgbox .img {
  width: calc(100% - 30px);
}

@media only screen and (min-width: 769px) {
  #sec1::before {
    height: 434px;
  }
  #sec1 h2.ttl {
    min-width: 250px;
    max-width: 350px;
  }
  #sec1 .imgbox .img {
    width: auto;
  }
}

#sec4 {
  position: relative;
  z-index: 0;
}
#sec4::before {
  content: "";
  height: 50vw;
  background: #fff;
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: -1;
}
@media only screen and (min-width: 769px) {
  #sec4::before {
    height: 434px;
  }
}

#sec6 {
  position: relative;
  z-index: 0;
}
#sec6::before {
  content: "";
  height: 50vw;
  background: #fff;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: -1;
}
@media only screen and (min-width: 769px) {
  #sec6::before {
    height: 367px;
  }
}

#sec14 .txt {
  font-weight: 600;
  font-size: 16px;
  line-height: 30px;
  letter-spacing: 0.02em;
  text-align: center;
}