.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;
}
.mv__en {
  display: block;
  margin-top: 8px;
  font-size: 1rem;
  font-weight: 600;
}

.features {
  margin-top: 56px;
}

.about {
  margin-top: 80px;
}

.detail {
  margin-top: 80px;
}
.detail__block + .detail__block {
  margin-top: 56px;
}
.detail__media {
  margin-top: 32px;
}
.detail__note {
  margin-top: 8px;
  padding-left: 2em;
  text-indent: -2em;
}

.use {
  margin-top: 80px;
}
.use__gallery {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 32px;
  list-style: none;
}
.use__gallery-img {
  overflow: hidden;
}
.use__gallery-img img {
  width: 100%;
  height: auto;
}
.use__gallery-cap {
  margin-top: 12px;
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
}
.use__chem {
  margin-top: 56px;
}
.use__chem th:nth-child(2),
.use__chem td:nth-child(2) {
  width: 300px;
}
.use__notes {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 8px;
}
.use__caution {
  margin-top: 8px;
}
.use__caution-block + .use__caution-block {
  margin-top: 24px;
}

.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;
  }
  .mv__en {
    font-size: 1.125rem;
  }
  .features {
    margin-top: 80px;
  }
  .about {
    margin-top: 140px;
  }
  .detail {
    margin-top: 140px;
  }
  .detail__block + .detail__block {
    margin-top: 80px;
  }
  .detail__media {
    align-items: center;
    margin-top: 40px;
  }
  .use {
    margin-top: 140px;
  }
  .use__gallery {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    margin-top: 40px;
  }
  .use__gallery-cap {
    font-size: 1.125rem;
  }
  .use__chem {
    margin-top: 80px;
  }
  .use__caution {
    margin-top: 16px;
  }
  .contact {
    margin-top: 140px;
  }
}