.collective-service-about {
  padding-top: 80px;
}
.collective-service-about__container {
  width: 100%;
  max-width: 1238px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 478px minmax(0, 1fr);
  grid-column-gap: 40px;
  padding-bottom: 80px;
}
.collective-service-about__heading {
  grid-column: 1/2;
  position: sticky;
  top: 80px;
  align-self: start;
  z-index: 1;
  margin-bottom: 100px;
}
.collective-service-about__title {
  font-size: 40px;
  font-weight: 300;
  font-style: normal;
  line-height: 120%;
  margin: 0 0 24px;
  color: #333;
  letter-spacing: normal;
}
.collective-service-about__subtitle {
  color: #A6A9AB;
  font-size: 11px;
  letter-spacing: normal;
  font-weight: 400;
  line-height: 120%;
}
.collective-service-about__item {
  grid-column: 2/3;
  padding: 80px 0;
  border-top: 1px solid var(--A6A9AB, #A6A9AB);
}
.collective-service-about__item-header {
  display: grid;
  align-items: start;
  column-gap: 16px;
  margin-bottom: 40px;
  position: relative;
  padding: 0 16px;
}
.collective-service-about__heading-text {
  font-size: 24px;
  line-height: 1.8;
  font-weight: 500;
}
.collective-service-about__image {
  max-width: 688px;
  height: 415px;
  box-sizing: content-box;
  padding: 0 16px;
}
.collective-service-about__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.collective-service-about__text {
  font-size: 16px;
  font-style: normal;
  font-weight: 400;
  line-height: 1.8;
  color: #333;
  margin-top: 48px;
  padding: 0 16px;
  letter-spacing: 0;
}

/* 右はみ出し防止（コンテナ幅以下で1カラム化）*/
@media (max-width: 1238px) {
  .collective-service-about__container {
    grid-template-columns: minmax(0, 1fr);
    grid-column-gap: 0;
    padding-left: 16px;
    padding-right: 16px;
    box-sizing: border-box;
  }
  .collective-service-about__heading {
    grid-column: 1/-1;
    position: static;
    top: auto;
  }
  .collective-service-about__item {
    grid-column: 1/-1;
    padding: 60px 0;
  }
  .collective-service-about__image {
    max-width: 100%;
    height: auto;
    aspect-ratio: 688/415;
    padding: 0;
  }
}
@media (max-width: 960px) {
  .collective-service-about {
    padding-top: 56px;
  }
  .collective-service-about__container {
    padding-bottom: 40px;
  }
  .collective-service-about__heading {
    margin-bottom: 40px;
  }
  .collective-service-about__title {
    font-size: 28px;
    margin: 0 0 16px;
  }
  .collective-service-about__item {
    padding: 40px 0;
  }
  .collective-service-about__item-header {
    margin-bottom: 32px;
  }
  .collective-service-about__heading-text {
    font-size: 20px;
    letter-spacing: normal;
  }
  .collective-service-about__image {
    padding: 0 16px;
  }
  .collective-service-about__text {
    font-size: 15px;
    margin-top: 32px;
  }
}