.page_body {
  background-color: #ebebeb;
}

/* lead
---------------------------------------------------------- */
.lead_area {
  padding: 40px 0;
}
@media all and (min-width: 751px) {
  .lead_area {
    padding: 50px 0 45px;
  }
}
@media all and (min-width: 751px) {
  .lead_area p {
    text-align: center;
    font-size: 15px;
  }
}

/* challenge
---------------------------------------------------------- */
.sec_challenge {
  overflow: hidden;
  background: linear-gradient(180deg, #ebebeb 0%, #ebebeb 35px, #fff 35px, #fff 100%);
  padding-bottom: 75px;
}
@media all and (min-width: 751px) {
  .sec_challenge {
    background: linear-gradient(180deg, #ebebeb 0%, #ebebeb 50px, #fff 50px, #fff 100%);
    padding-bottom: 120px;
  }
}
.sec_challenge:not(:last-child) {
  margin-bottom: 40px;
}
@media all and (min-width: 751px) {
  .sec_challenge:not(:last-child) {
    margin-bottom: 70px;
  }
}
.sec_challenge .sec_ttl {
  text-align: center;
  margin-bottom: 56px;
}
@media all and (min-width: 751px) {
  .sec_challenge .sec_ttl {
    margin-bottom: 80px;
  }
}
.sec_challenge .sec_ttl .en {
  font-family: "Oswald", sans-serif;
  font-optical-sizing: auto;
  font-weight: bold;
  color: #a9161b;
  font-size: 26px;
}
@media all and (min-width: 751px) {
  .sec_challenge .sec_ttl .en {
    font-size: 56px;
    line-height: 1.5;
  }
}
.sec_challenge .sec_ttl .en span {
  font-size: 1.23em;
  margin-left: 0.2em;
}
@media all and (min-width: 751px) {
  .sec_challenge .sec_ttl .en span {
    font-size: 1.07em;
  }
}
.sec_challenge .sec_ttl .jp {
  font-size: 18px;
  letter-spacing: 0.1em;
  line-height: 1.8;
}
@media all and (min-width: 751px) {
  .sec_challenge .sec_ttl .jp {
    font-size: 28px;
    letter-spacing: 0.02em;
  }
}
.sec_challenge .sec_ttl .jp span {
  color: #fff;
  background-color: #a9161b;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
  padding: 1px 10px;
}
@media all and (min-width: 751px) {
  .sec_challenge .sec_ttl .jp span {
    padding: 0 12px;
  }
}
.sec_challenge .block:not(:last-child) {
  margin-bottom: 20px;
}
@media all and (min-width: 751px) {
  .sec_challenge .block:not(:last-child) {
    margin-bottom: 50px;
  }
}
.sec_challenge .block .heading {
  color: #a9161b;
  font-size: 16px;
  margin-bottom: 16px;
}
@media all and (min-width: 751px) {
  .sec_challenge .block .heading {
    font-size: 22px;
    line-height: 1.72;
    margin-bottom: 12px;
  }
}
.sec_challenge .block .text p {
  line-height: 1.7;
}
@media all and (min-width: 751px) {
  .sec_challenge .block .text p {
    line-height: 2;
  }
}
.sec_challenge .wrap {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  gap: 20px;
}
@media all and (min-width: 751px) {
  .sec_challenge .wrap {
    -webkit-box-orient: horizontal;
    -webkit-box-direction: normal;
        -ms-flex-direction: row;
            flex-direction: row;
    -webkit-box-align: start;
        -ms-flex-align: start;
            align-items: flex-start;
    gap: 46px;
  }
}
@media screen and (min-width: 751px) and (max-width: 1080px) {
  .sec_challenge .wrap {
    gap: 30px;
  }
}
.sec_challenge .wrap .image {
  position: relative;
  z-index: 1;
  width: 96%;
}
@media all and (min-width: 751px) {
  .sec_challenge .wrap .image {
    width: 45.5%;
  }
}
.sec_challenge .wrap .image::before {
  position: absolute;
  content: "";
  aspect-ratio: 1;
  background-color: #a9161b;
  z-index: -1;
}
.sec_challenge .wrap .image.left::before {
  width: 44.6%;
  top: -11%;
  left: -8.6%;
}
@media all and (min-width: 751px) {
  .sec_challenge .wrap .image.left::before {
    width: 28.4%;
    top: -11%;
    left: -9.3%;
  }
}
.sec_challenge .wrap .image.right::before {
  width: 44.6%;
  bottom: -11%;
  right: -8.6%;
}
@media all and (min-width: 751px) {
  .sec_challenge .wrap .image.right::before {
    width: 33.3%;
    bottom: -9%;
    right: -6%;
  }
}
@media all and (min-width: 751px) {
  .sec_challenge .wrap .texts {
    -webkit-box-flex: 1;
        -ms-flex: 1;
            flex: 1;
  }
}