.intro.sauna {
  padding: 120px 0;
  color: #fff !important;
  background-color: #0e0e0e;
}
.intro.sauna #intro-title {
  color: #fff !important;
}
.intro.sauna .read_text {
  color: #fff !important;
}
.intro.sauna .intro_summary {
  color: #999;
}

/* ======================================
   Intro diagram
====================================== */
.sauna-intro-diagram {
  margin: 60px 0;
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

/* イラストと円グループを 1 : 4.92（180px : 886px）の比率で分け合う。
   画面幅が狭まるとイラストも一緒に縮む */
.sauna-intro-diagram__person {
  flex: 1 1 0;
  min-width: 0;
  max-width: 180px;
  align-self: center;
  margin-right: 20px;
}

.sauna-intro-diagram__person img {
  width: 100%;
  height: auto;
  display: block;
}

.sauna-intro-diagram__items {
  flex: 4.92 1 0;
  min-width: 0;
  max-width: 886px;
  display: flex;
  align-items: flex-start;
}

/* 円は最大190pxで、画面幅が狭まると比例して縮む。
   重なり幅と段差も%指定なので、縮んでも見た目の比率は変わらない */
.sauna-intro-diagram .item {
  flex: 1 1 0;
  min-width: 0;
  max-width: 190px;
  height: auto;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: #1c1c1c;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  font-size: clamp(10px, 1.15vw, 15px);
  line-height: 1.6;
  font-weight: 700;
  box-sizing: border-box;
  padding: 0 6%;
}

.sauna-intro-diagram .item + .item {
  margin-left: -1.8%;
}

.sauna-intro-diagram .item:nth-child(even) {
  margin-top: 11.2%;
}
/* ======================================
   Operation model
====================================== */
.operation-model {
  padding: 0 0 68px;
}

.operation-flow {
  margin-top: 26px;
  width: 100%;
}

/* ======================================
   Features
====================================== */
.features {
  padding: 0 0 70px;
}

.features__grid {
  width: 100%;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
}

.feature-card {
  width: 48%;
  background: transparent;
  margin-bottom: 20px;
}

.feature-card__header {
  margin-bottom: 20px;
}

.feature-card__title {
  font-size: 20px;
  line-height: 1.5;
  font-weight: 700;
  color: #222;
}

.feature-card__body {
  width: 100%;
  padding: 30px 30px 60px 30px;
  border: 1px solid #0e0e0e;
}

.feature-card__lead {
  font-size: 20px;
  line-height: 1.55;
  font-weight: 700;
  color: #222;
}

.feature-card__text {
  margin-top: 30px;
  line-height: 1.95;
  font-size: 15px;
  color: #333;
}

.feature-card__image {
  width: 100%;
  margin-top: 18px;
  text-align: center;
}

.feature-card__image--center img {
  width: 100%;
}

.feature-card__image--device img {
  width: 100%;
}

.feature-card__image--camera img {
  width: 100%;
}

.feature-card__image--cleaning img {
  display: block;
  margin: 0 auto;
  width: 100%;
}

.feature-card__labels {
  margin-top: 16px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
}

.feature-card__labels span {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px 8px;
  line-height: 1.4;
  color: #de0b22;
  text-align: center;
  font-weight: 400;
  font-size: 15px;
}

.feature-card__bottom {
  margin-top: 30px;
  text-align: center;
  font-size: 18px;
  line-height: 1.8;
  font-weight: 700;
  color: #222;
}

.feature-card__subsection {
  margin-top: 18px;
  background-color: #f7f7f7;
  padding: 30px;
}

.feature-card__subsection h5 {
  font-size: 20px;
  line-height: 1.5;
  font-weight: 700;
  margin-bottom: 30px;
  color: #222;
}

.feature-card__subsection p {
  margin-top: 6px;
  font-size: 15px;
  line-height: 2;
  color: #333;
}

/* ======================================
   Merits
====================================== */
.merits {
  padding: 120px 0;
  background: #f3f4ee;
}

.merits__content {
  margin-top: 22px;
  display: grid;
  grid-template-columns: 220px 1fr;
  column-gap: 28px;
  align-items: center;
}

.merits__brand {
  display: flex;
  justify-content: center;
  align-items: center;
}

.merits__brand img {
  width: 150px;
}

.merits__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px 10px;
}

.merit-box {
  border: 1px solid #de0b22;
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  text-align: center;
  font-size: 14px;
  line-height: 1.45;
  font-weight: 700;
  color: #de0b22;
}

.merits__closing {
  margin-top: 18px;
  text-align: center;
}

.merits__closing h3 {
  font-size: 22px;
  line-height: 1.75;
  font-weight: 700;
  color: #222;
}

/* --- サウナ merits レイアウト --- */
.merits.sauna {
  padding: 120px 0;
}

.merits.sauna .merits__content {
  margin-top: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: 40px;
  align-items: center;
}

.merits.sauna .merits__brand {
  display: flex;
  align-items: center;
  justify-content: center;
}

.merits.sauna .merits__brand img {
  width: 100%;
  max-width: 400px;
}

.merits.sauna .merits__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.merits.sauna .merit-box {
  border: none;
  border-radius: 0;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  text-align: left;
  gap: 20px;
  font-size: 20px;
  line-height: 32px;
  color: #de0b22;
}

.merits.sauna .merit-box__num {
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: #de0b22;
  color: #fff;
  font-size: 15px;
  line-height: 1;
  letter-spacing: 0.05em;
}

.merits.sauna .merits__closing {
  margin-top: 30px;
  text-align: left;
}

.merits.sauna .merits__closing h3 {
  font-size: 30px;
  line-height: 48px;
  font-weight: 700;
}

.merits.sauna .merits__closing p {
  margin-top: 20px;
  font-size: 15px;
  line-height: 30px;
}

@media screen and (max-width: 768px) {
  .intro.sauna {
    padding: 60px 0;
    margin-bottom: 0;
  }
  .intro.sauna .section-heading__title {
    text-align: center;
    font-size: 22.5px;
  }
  .intro.sauna .read_text {
    margin-top: 30px;
    font-size: 12px;
    line-height: 2;
  }
  /* ======================================
     Intro diagram
  ====================================== */
  .sauna-intro-diagram {
    margin: 30px 0;
    flex-direction: column-reverse;
    align-items: center;
  }

  .sauna-intro-diagram__person {
    flex: 0 0 auto;
    max-width: none;
    margin-right: 0;
    margin-bottom: 20px;
  }

  .sauna-intro-diagram__person img {
    width: 130px;
    max-width: 130px;
  }

  .sauna-intro-diagram__items {
    flex: 0 0 auto;
    max-width: none;
    display: grid;
    grid-template-columns: repeat(2, auto);
    justify-content: center;
    justify-items: center;
    gap: 12px;
  }

  /* 上から 2 : 1 : 2 で並べるため、3つ目だけ2列にまたがらせる */
  .sauna-intro-diagram .item:nth-child(3) {
    grid-column: 1 / -1;
  }

  .sauna-intro-diagram .item {
    flex: 0 0 auto;
    width: 150px;
    max-width: 150px;
    height: 150px;
    font-size: 13px;
    line-height: 24px;
    padding: 0 8px;
  }

  .sauna-intro-diagram .item + .item {
    margin-left: 0;
  }

  .sauna-intro-diagram .item:nth-child(even) {
    margin-top: 0;
  }
  .intro.sauna .intro_summary {
    font-size: 22.5px;
  }

  /* ======================================
     Operation model
  ====================================== */
  .operation-model {
    padding: 60px 0;
  }
  .operation-model .section-heading__title,
  .operation-model .section-heading__sub_title {
    font-size: 22.5px;
    margin-bottom: 0;
    text-align: center;
  }
  .operation-model .section-heading__lead {
    margin-top: 60px;
  }
  .operation-flow {
    margin-top: 60px;
    grid-template-columns: 1fr;
    row-gap: 18px;
  }

  /* ======================================
     Features
  ====================================== */
  .features {
    padding: 0 0 56px;
  }

  #clean.feature-card {
    margin-top: 30px;
  }
  .feature-card {
    width: 100%;
    margin-right: 0;
  }

  .feature-card__header {
    margin-bottom: 12px;
  }

  .feature-card__title {
    font-size: 15px;
    line-height: 1.5;
  }

  .feature-card__body {
    padding: 15px;
  }

  .feature-card__lead {
    font-size: 18px;
    line-height: 1.6;
  }

  .feature-card__text {
    margin-top: 8px;
    font-size: 15px;
    line-height: 1.9;
  }

  .feature-card__image {
    margin-top: 16px;
  }

  .feature-card__labels {
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    margin-top: 15px;
    margin-bottom: 15px;
  }

  .feature-card__labels span {
    min-height: 34px;
    padding: 6px 8px;
    font-size: 12px;
    line-height: 1.45;
  }

  .feature-card__bottom {
    margin-top: 12px;
    font-size: 16px;
    line-height: 1.8;
  }

  .feature-card__subsection {
    margin-top: 0;
  }

  .feature-card__subsection h5 {
    font-size: 16px;
    line-height: 1.5;
    margin-bottom: 15px;
  }

  .feature-card__subsection p {
    margin-top: 4px;
    font-size: 12px;
    line-height: 1.9;
  }

  /* ======================================
     Merits
  ====================================== */
  .merits {
    padding: 60px 0;
  }
  .merits .section-heading__title {
    font-size: 22.5px;
    text-align: center;
    margin-bottom: 30px;
  }
  .merits .section-heading__lead {
    font-size: 12px;
    line-height: 2;
  }

  .merits__content {
    margin-top: 30px;
    grid-template-columns: 1fr;
    row-gap: 22px;
  }

  .merits__brand {
    justify-content: flex-start;
    margin-bottom: 30px;
  }

  .merits__brand img {
    width: 100%;
  }

  .merits__grid {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .merit-box {
    min-height: 42px;
    padding: 10px 12px;
    font-size: 13px;
    line-height: 1.5;
  }

  .merits__closing {
    margin-top: 18px;
  }

  .merits__closing h3 {
    text-align: center;
    font-size: 22.5px;
    line-height: 1.6;
  }

  .merits__closing p {
    margin-top: 30px;
    font-size: 12px;
    line-height: 2;
  }

  /* --- サウナ merits レイアウト --- */
  .merits.sauna {
    padding: 56px 0;
  }

  .merits.sauna .merits__content {
    grid-template-columns: 1fr;
    row-gap: 24px;
  }

  .merits.sauna .merits__brand img {
    max-width: 220px;
  }

  .merits.sauna .merits__grid {
    gap: 30px;
  }

  .merits.sauna .merit-box {
    gap: 14px;
    font-size: 15px;
    line-height: 1.7;
  }

  .merits.sauna .merit-box__num {
    flex: 0 0 36px;
    width: 36px;
    height: 36px;
    font-size: 13px;
  }

  .merits.sauna .merits__closing {
    margin-top: 24px;
  }

  .merits.sauna .merits__closing h3 {
    font-size: 20px;
    line-height: 1.7;
  }

  .merits.sauna .merits__closing p {
    margin-top: 12px;
    font-size: 13px;
    line-height: 1.9;
  }
}