.about__column {
  position: relative;
  margin-top: 16px;
}

@media (min-width: 768px) {
  .about__column {
    background: #e6e6e6;
    padding: 0 32px 32px;
    margin-top: 210px;
    border-radius: 8px;
  }
}

.about__ttl {
  margin-top: 60px;
}

@media (min-width: 768px) {
  .about__ttl {
    margin-top: 80px;
  }
}

.about__ttl img {
  height: 20px;
}

@media (min-width: 768px) {
  .about__ttl img {
    height: 30px;
  }
}

.about__txt {
  position: relative;
  padding-top: 20px;
  font-size: 13px;
  font-size: 0.8125rem;
}

@media (min-width: 768px) {
  .about__txt {
    padding-top: 140px;
    font-size: 0.875rem;
  }
}

.about__btn {
  font-size: 14px;
  font-size: 0.875rem;
  display: block;
  background: #88df9a;
  color: #fff;
  text-align: center;
  padding: 10px;
  font-weight: bold;
  width: 240px;
  margin: 24px auto 0;
}

@media (min-width: 768px) {
  .about__btn {
    font-size: 0.9375rem;
    margin-top: 20px;
    width: 220px;
  }
}

.about__ph {
  margin-left: -30px;
  width: calc(100% + 60px);
  overflow: hidden;
}

.about__ph img {
  width: 100%;
}

@media (min-width: 768px) {
  .about__ph {
    width: auto;
    position: absolute;
    top: -190px;
    left: 0;
    margin-left: 0;
  }
}

.introduction__catch {
  position: relative;
  z-index: 0;
  margin: 32px 0;
}

@media (min-width: 768px) {
  .introduction__catch {
    margin: 60px 0 56px;
  }
}

.introduction__catch:before {
  position: absolute;
  top: -10px;
  left: -15px;
  z-index: -1;
  content: '';
  width: 21px;
  height: 16px;
  background: url(/assets/img/introduction/ttl_catch_quote.svg);
  background-size: 100%;
}

@media (min-width: 768px) {
  .introduction__catch:before {
    position: absolute;
    top: -20px;
    left: -35px;
    width: 50px;
    height: 38px;
  }
}

.introduction__catch img {
  height: 55px;
}

@media (min-width: 768px) {
  .introduction__catch img {
    height: 100px;
  }
}

.introduction__and img {
  display: block;
  height: 14px;
}

@media (min-width: 768px) {
  .introduction__and img {
    height: 20px;
  }
}

.introduction__txt {
  font-size: 14px;
  font-size: 0.875rem;
  z-index: 0;
  position: relative;
  line-height: 1.9;
}

@media (min-width: 768px) {
  .introduction__txt {
    font-size: 1.0625rem;
    line-height: 2.375em;
  }
}

.introduction__txt p {
  margin-top: 1em;
}

.introduction__txt .devider {
  margin: 30px -30px 0;
}

.introduction__txt .devider img {
  width: 100%;
}

@media (min-width: 768px) {
  .introduction__txt .devider {
    position: absolute;
    bottom: 10px;
    right: -20px;
    width: 229px;
    height: 127px;
    background: url(/assets/img/introduction/ph_shigure.png);
    background-size: 100%;
  }
}

.introduction__scene {
  margin-left: -30px;
  margin-top: 40px;
  width: calc(100% + 60px);
}

.introduction__scene img {
  width: 100%;
}

@media (min-width: 768px) {
  .introduction__scene {
    margin-top: 80px;
    margin-left: -100px;
    width: calc(100% + 200px);
  }
}

.introduction__slide {
  margin: -30px -30px 0;
  overflow: hidden;
  position: relative;
}

.introduction__slide:before {
  content: '';
  display: block;
  padding-top: 56.25%;
}

.introduction__slide__item {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
}

.introduction__slide__item:nth-child(1) {
  z-index: 4;
}

.introduction__slide__item:nth-child(2) {
  z-index: 3;
}

.introduction__slide__item:nth-child(3) {
  z-index: 2;
}

.introduction__slide__item:nth-child(4) {
  z-index: 1;
}

.introduction__slide img {
  width: 100%;
  border-radius: 20px 20px 0 0;
}

@media (min-width: 768px) {
  .introduction__slide img {
    border-radius: 8px;
  }
}