.mv {
  position: relative;
}
.mv__bg {
  position: relative;
  display: flex;
  align-items: center;
  max-height: 643px;
  overflow: hidden;
  line-height: 0;
}
.mv__bg img {
  width: 100%;
  height: auto;
}
.mv__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.35);
}
.mv__inner {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  padding-inline: 5%;
}
.mv__ttl {
  font-size: 1.75rem;
  font-weight: 700;
  text-align: center;
  color: #fff;
}
.mv__ttl::after {
  content: "";
  display: block;
  width: 120px;
  height: 6px;
  background-color: #ff0000;
  margin: 16px auto 0;
}

.intro {
  margin-top: 56px;
}
.intro__lead {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.6;
}

.features {
  margin-top: 80px;
}
.features__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.difference {
  margin-top: 80px;
}
.difference__lead {
  font-size: 1rem;
  line-height: 1.6;
}
.difference__band {
  margin-top: 40px;
}
.difference__block {
  margin-top: 40px;
}
.difference__subttl {
  font-size: 1.125rem;
  font-weight: 700;
  line-height: 1.4;
  color: #ff7f00;
  margin-bottom: 16px;
}
.difference__notes {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 16px;
}

.detail {
  margin-top: 80px;
}
.detail__block {
  margin-top: 40px;
}
.detail__img {
  max-width: 960px;
  margin-top: 56px;
}
.detail__img img {
  width: 100%;
  height: auto;
}
.detail__table {
  margin-top: 24px;
}

.cases {
  margin-top: 80px;
}
.cases__lead {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.5;
}
.cases__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 24px;
}
.cases__img {
  overflow: hidden;
}
.cases__img img {
  width: 100%;
  height: auto;
}
.cases__list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.related {
  margin-top: 80px;
}
.related__card {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 24px;
}
.related__img {
  overflow: hidden;
}
.related__img img {
  width: 100%;
  height: auto;
}
.related__body {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.related__ttl {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.4;
  color: #ff0000;
}

.contact {
  margin-top: 80px;
  text-align: center;
}

@media screen and (min-width: 768px) {
  .mv__ttl {
    font-size: 2.5rem;
  }
  .mv__ttl::after {
    width: 200px;
    height: 8px;
    margin-top: 24px;
  }
  .intro {
    margin-top: 80px;
  }
  .intro__lead {
    font-size: 1.25rem;
  }
  .features {
    margin-top: 140px;
  }
  .features__list {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
  .difference {
    margin-top: 140px;
  }
  .difference__lead {
    font-size: 1.125rem;
  }
  .difference__band {
    margin-top: 56px;
  }
  .difference__block {
    margin-top: 56px;
  }
  .difference__subttl {
    font-size: 1.25rem;
  }
  .detail {
    margin-top: 140px;
  }
  .detail__block {
    margin-top: 56px;
  }
  .cases {
    margin-top: 140px;
  }
  .cases__lead {
    font-size: 1.75rem;
  }
  .cases__body {
    grid-template-columns: 1fr 1fr;
    align-items: start;
    gap: 80px;
    margin-top: 40px;
  }
  .cases__img {
    height: 400px;
  }
  .cases__img img {
    height: 100%;
    -o-object-fit: cover;
    object-fit: cover;
  }
  .cases__list {
    gap: 24px;
  }
  .related {
    margin-top: 120px;
  }
  .related__card {
    grid-template-columns: 1fr 1fr;
    align-items: stretch;
    gap: 80px;
    margin-top: 40px;
  }
  .related__img img {
    width: 100%;
    height: 100%;
    -o-object-fit: cover;
    object-fit: cover;
  }
  .related__body {
    gap: 24px;
  }
  .related__ttl {
    font-size: 1.5rem;
  }
  .contact {
    margin-top: 140px;
  }
}