.system-chapter{
  --chapter-accent: #006f70;
  display: inline-grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 9px 12px;
  max-width: min(100%, 520px);
  margin: 0 0 18px;
  padding: 8px 12px 8px 10px;
  border-left: 3px solid var(--chapter-accent);
  background: color-mix(in srgb, #fffdf7 78%, transparent);
  box-shadow: 0 16px 44px rgba(22, 44, 41, .08);
  color: #173333;
}

.system-chapter span{
  font-family: "Inter", "Noto Sans JP", sans-serif;
  font-size: 10px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--chapter-accent);
  white-space: nowrap;
}

.system-chapter strong{
  font-size: 12px;
  font-weight: 900;
  line-height: 1.55;
  letter-spacing: .04em;
}

.system-chapter em{
  grid-column: 2;
  margin-top: -7px;
  font-size: 11px;
  font-style: normal;
  font-weight: 800;
  line-height: 1.5;
  color: rgba(23, 51, 51, .62);
}

.service-map-page{--chapter-accent:#006f70;}
.pricing-ledger-page{--chapter-accent:#a97725;}
.works-gallery-page{--chapter-accent:#006f70;}
.support-care-page{--chapter-accent:#476f87;}
.contact-breakthrough{--chapter-accent:#006f70;}

@media (max-width: 640px){
  .system-chapter{
    width: 100%;
    grid-template-columns: 1fr;
    gap: 5px;
    margin-bottom: 16px;
    padding: 9px 10px;
  }

  .system-chapter em{
    grid-column: auto;
    margin-top: 0;
  }
}

/* Convergence pass: keep lower-page first views readable on shorter desktop screens. */
@media (min-width: 981px) and (max-height: 760px){
  .map-hero,
  .price-hero,
  .works-hero,
  .care-hero,
  .bt-hero{
    min-height: auto;
    padding-top: 94px;
    padding-bottom: 64px;
  }

  .system-chapter{
    margin-bottom: 14px;
    padding-top: 7px;
    padding-bottom: 7px;
  }

  .map-hero__grid,
  .price-hero__grid,
  .works-hero__grid,
  .care-hero__grid,
  .bt-hero-grid{
    align-items: center;
    gap: clamp(30px, 5vw, 70px);
  }

  .map-hero__copy h1,
  .price-hero__copy h1,
  .works-hero__copy h1,
  .care-hero__copy h1,
  .bt-hero-copy h1{
    margin-top: 12px;
    font-size: clamp(52px, 5.6vw, 78px);
    line-height: .92;
  }

  .bt-hero-copy h1{
    font-size: clamp(48px, 5vw, 70px);
  }

  .map-hero__copy > p,
  .price-hero__copy > p,
  .works-hero__copy > p,
  .care-hero__copy > p,
  .bt-hero-copy > p{
    max-width: 560px;
    margin-top: 22px;
    font-size: 15px;
    line-height: 1.82;
  }

  .map-actions,
  .price-hero__actions,
  .care-actions,
  .bt-actions{
    margin-top: 24px;
  }

  .map-compass,
  .estimate-slip,
  .works-hero__note,
  .care-status,
  .bt-note-card{
    margin-top: 8vh;
  }
}

@media (min-width: 981px) and (max-width: 1120px){
  .bt-start-grid{
    grid-template-columns: minmax(0, .54fr) minmax(0, 1fr);
    gap: 32px;
  }

  .bt-start-options{
    gap: 10px;
  }

  .bt-start-options button{
    min-width: 0;
    padding-inline: 16px;
  }

  .bt-current-list article{
    grid-template-columns: 54px minmax(0, 1fr);
    gap: 18px 24px;
  }

  .bt-current-list p{
    grid-column: 2;
  }
}