.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-top: 84px;
  padding-bottom: 56px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -46%;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(14, 158, 110, .22), rgba(14, 158, 110, 0) 68%);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .about-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--green-200);
}

.page-about .about-hero-title {
  margin: 0;
  max-width: 16ch;
  font-size: clamp(32px, 8.4vw, 72px);
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -.015em;
  color: var(--ink-on-dark);
}

.page-about .about-hero-lead {
  margin: 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-on-dark-soft);
}

.page-about .about-hero-stats {
  list-style: none;
  margin: 14px 0 0;
  padding: 18px 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  border-top: 1px solid rgba(214, 226, 235, .18);
}

.page-about .about-hero-stat {
  min-width: 0;
}

.page-about .about-hero-stat-v {
  display: block;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.2;
  color: var(--paper);
}

.page-about .about-hero-stat-k {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--ink-on-dark-soft);
}

/* 章节通用留白 */
.page-about .about-origin,
.page-about .about-desk,
.page-about .about-map,
.page-about .about-years,
.page-about .about-cities,
.page-about .about-partners {
  position: relative;
}

.page-about .about-origin-grid,
.page-about .about-desk-grid,
.page-about .about-map-grid,
.page-about .about-cities-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  margin-top: 36px;
}

.page-about .about-prose p {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-quote {
  border-left: 3px solid var(--orange-500);
  padding: 2px 0 2px 20px;
}

.page-about .about-quote p {
  margin: 0;
  font-size: 20px;
  line-height: 1.62;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--blue-900);
}

.page-about .about-desk-copy p {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-fields {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-field {
  padding: 8px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line);
  background: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--blue-700);
}

.page-about .about-desk-figure,
.page-about .about-cities-figure {
  margin: 0;
}

.page-about .about-bignums {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  border-top: 1px solid rgba(214, 226, 235, .16);
}

.page-about .about-bignum {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid rgba(214, 226, 235, .16);
}

.page-about .about-bignum-v {
  flex: none;
  min-width: 3.9em;
  font-family: var(--font-mono);
  font-size: clamp(30px, 9vw, 48px);
  font-weight: 400;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--green-200);
}

.page-about .about-bignum-l {
  font-size: 13px;
  line-height: 1.4;
  letter-spacing: .06em;
  color: var(--ink-on-dark-soft);
}

.page-about .about-map-figure {
  margin: 0;
}

.page-about .about-dotmap {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  background: var(--blue-900);
}

.page-about .about-map-cap {
  margin: 12px 0 0;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--ink-on-dark-soft);
}

.page-about .about-map-note {
  margin: 34px 0 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-on-dark-soft);
}

.page-about .about-timeline {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--green-600), var(--orange-500));
}

.page-about .about-tl-item {
  position: relative;
  padding: 0 0 32px 36px;
}

.page-about .about-tl-item:last-child {
  padding-bottom: 0;
}

.page-about .about-tl-dot {
  position: absolute;
  left: 0;
  top: 7px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--mist);
  border: 3px solid var(--green-600);
  box-sizing: border-box;
}

.page-about .about-tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--orange-500);
  margin-bottom: 6px;
}

.page-about .about-tl-title {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--blue-900);
}

.page-about .about-tl-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-years-figure {
  margin: 40px 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-cities-copy .chapter {
  margin-bottom: 26px;
}

.page-about .about-disclosures {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-disclosures .disclosure {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--paper);
  overflow: hidden;
}

.page-about .about-disclosures .disclosure-trigger {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 16px 18px;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  font-size: 16px;
  font-weight: 700;
  color: var(--blue-900);
}

.page-about .about-disclosures .disclosure-index {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--orange-500);
}

.page-about .about-disclosures .disclosure-title {
  flex: 1 1 auto;
}

.page-about .about-disclosures .disclosure-icon {
  flex: none;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--green-600);
  border-bottom: 2px solid var(--green-600);
  transform: rotate(45deg);
  transition: transform 240ms var(--ease);
}

.page-about .about-disclosures .disclosure.is-open .disclosure-icon {
  transform: rotate(225deg);
}

.page-about .about-disclosures .disclosure-body {
  padding: 0 18px 18px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-disclosures .disclosure-body p {
  margin: 0;
}

.page-about .about-partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 36px;
}

.page-about .about-partner {
  padding: 24px 22px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, .055);
  border: 1px solid rgba(214, 226, 235, .18);
}

.page-about .about-partner h3 {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ink-on-dark);
}

.page-about .about-partner p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink-on-dark-soft);
}

.page-about .about-next {
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid rgba(214, 226, 235, .2);
}

.page-about .about-next-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--green-200);
}

.page-about .about-next-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-next-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 0;
  text-decoration: none;
  border-bottom: 1px solid rgba(214, 226, 235, .14);
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
  transition: color 240ms var(--ease), padding-left 240ms var(--ease);
}

.page-about .about-next-desc {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: .02em;
  color: var(--ink-on-dark-soft);
}

.page-about .about-next-link:hover,
.page-about .about-next-link:focus-visible {
  color: var(--green-200);
  padding-left: 6px;
}

@media (min-width: 720px) {
  .page-about .about-partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-hero-stat-v {
    font-size: 24px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding-top: 128px;
    padding-bottom: 96px;
  }

  .page-about .about-origin-grid {
    grid-template-columns: 7fr 5fr;
    gap: 64px;
    align-items: start;
    margin-top: 48px;
  }

  .page-about .about-desk-grid {
    grid-template-columns: 7fr 5fr;
    gap: 64px;
    align-items: center;
    margin-top: 48px;
  }

  .page-about .about-map-grid {
    grid-template-columns: 5fr 7fr;
    gap: 64px;
    align-items: start;
    margin-top: 48px;
  }

  .page-about .about-bignum {
    padding: 22px 0;
  }

  .page-about .about-bignum-v {
    font-size: 46px;
  }

  .page-about .about-map-note {
    margin-top: 44px;
  }

  .page-about .about-timeline {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    column-gap: 26px;
    margin-top: 56px;
  }

  .page-about .about-timeline::before {
    left: 0;
    right: 0;
    top: 4px;
    bottom: auto;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--green-600), var(--orange-500));
  }

  .page-about .about-tl-item {
    padding: 40px 0 0;
  }

  .page-about .about-tl-item:last-child {
    padding-bottom: 0;
  }

  .page-about .about-tl-dot {
    top: -3px;
  }

  .page-about .about-tl-year {
    font-size: 40px;
    font-weight: 200;
    letter-spacing: -.02em;
    line-height: 1;
    color: var(--blue-900);
    margin-bottom: 12px;
  }

  .page-about .about-years-figure {
    margin-top: 56px;
  }

  .page-about .about-cities-grid {
    grid-template-columns: 5fr 7fr;
    gap: 64px;
    align-items: start;
    margin-top: 0;
  }

  .page-about .about-cities-figure {
    position: sticky;
    top: calc(var(--header-h) + 32px);
  }

  .page-about .about-next-list {
    flex-direction: row;
    gap: 32px;
  }

  .page-about .about-next-list li {
    flex: 1 1 0;
  }
}
<<<END>>>