.what-how {
  --section-space: clamp(40px, 5vw, 76px);
  --column-gap: clamp(24px, 4vw, 64px);
  max-width: 1440px;
  margin-inline: auto;
  padding: clamp(100px, 8vw, 126px) var(--pad) 0;
}
.what-how > section { padding: var(--section-space) 0; scroll-margin-top: 84px; }
.family-archive summary { font-size: 13px; font-weight: 500; }
.family-archive summary:hover span:first-child { text-decoration: underline; text-underline-offset: 4px; }

.what-how .heritage { padding-bottom: 0; }
.heritage-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--column-gap);
  align-items: end;
  margin-bottom: clamp(24px, 3vw, 46px);
}
.heritage-intro h2 {
  font-size: clamp(48px, 6vw, 88px);
  line-height: 1;
  letter-spacing: -.035em;
}
.heritage-intro p { max-width: 38ch; font-size: clamp(18px, 1.55vw, 23px); line-height: 1.4; }
.heritage-gallery { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(16px, 2vw, 30px); }
.heritage-gallery img { width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; object-position: center 18%; }
.heritage-gallery figure:first-child img { object-position: center top; }
.heritage-gallery figcaption { margin-top: 14px; }
.generation { display: block; font-family: var(--serif); font-style: italic; color: var(--italic-ink); font-size: clamp(19px, 1.65vw, 25px); }
.heritage-gallery figcaption p { max-width: 45ch; margin-top: 6px; line-height: 1.55; }
.family-archive { margin-top: 26px; border-top: 1px solid var(--hair); }
.family-archive summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 44px;
  list-style: none;
  cursor: pointer;
}
.family-archive summary::-webkit-details-marker { display: none; }
.toggle-sign { font-size: 19px; }
.family-archive[open] .toggle-sign { transform: rotate(45deg); }
.archive-photos { display: flex; flex-wrap: wrap; align-items: end; gap: 16px; padding-block: 12px; }
.archive-photos img { width: auto; max-width: 100%; height: auto; max-height: 305px; }

.what-how .mission {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: center;
  background: var(--paper);
  padding: 0;
}
.mission-copy { padding: clamp(28px, 3.5vw, 54px); }
.mission-motto {
  margin: 18px 0 22px;
  font-size: clamp(32px, 3.25vw, 50px);
  line-height: 1.13;
  letter-spacing: -.04em;
  font-weight: 700;
}
.mission-motto em { font-family: var(--serif); font-weight: 400; letter-spacing: -.025em; }
.mission-copy p:not(.mission-motto) { max-width: 52ch; margin-top: 12px; }
.mission-copy .mission-principle { border-top: 1px solid var(--hair); padding-top: 14px; font-weight: 500; }
.mission img { width: 100%; height: 100%; min-height: 0; object-fit: cover; }

.reader-section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: var(--column-gap);
  align-items: start;
}
.reader-section + .reader-section { border-top: 1px solid var(--hair-strong); }
.reader-section > h2 { max-width: 15ch; font-size: clamp(30px, 3.4vw, 50px); line-height: 1.08; letter-spacing: -.04em; }
.capability-list { list-style: none; }
.capability-list li {
  padding-block: 16px;
  border-bottom: 1px solid var(--hair);
}
.capability-list li:first-child { padding-top: 0; }
.capability-list h3 { font-size: clamp(18px, 1.45vw, 22px); line-height: 1.3; }
.capability-list p { margin-top: 5px; font-size: 15px; line-height: 1.6; }
.capability-list p { max-width: 66ch; }

.reader-section .acc { border-top: none; }
.reader-section .acc summary { padding: 15px 0; text-transform: none; font-size: clamp(17px, 1.4vw, 21px); font-weight: 500; }
.reader-section .acc details:first-child summary { padding-top: 0; }
.reader-section .acc-body { max-width: 66ch; font-size: 15px; opacity: 1; }
.what-how .brief-section { padding-top: 0; }
.brief-section .cta { align-items: center; }
.brief-section .big { font-size: clamp(34px, 4.2vw, 62px); }

@media (max-width: 800px) {
  .heritage-intro { grid-template-columns: 1fr; gap: 12px; }
  .heritage-gallery { gap: 16px; }
  .mission-copy { padding: 24px; }
  .reader-section { grid-template-columns: 1fr; gap: 24px; }
  .reader-section > h2 { max-width: none; }
  .brief-section .cta { align-items: start; gap: 20px; }
}
@media (max-width: 620px) {
  .what-how { padding-top: 92px; }
  .heritage-gallery { grid-template-columns: 1fr; gap: 0; }
  .heritage-gallery figure { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.2fr); gap: 16px; align-items: center; padding-block: 16px; border-top: 1px solid var(--hair); }
  .heritage-gallery img { aspect-ratio: 1; }
  .heritage-gallery figcaption, .family-archive { margin-top: 0; }
  .what-how .mission { grid-template-columns: 1fr; }
  .mission img { height: auto; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}