.page-about {
  --about-kicker-size: 0.75rem;
  position: relative;
  background: var(--warm-paper);
  color: var(--ink);
  overflow-x: clip;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-1);
  padding-top: var(--space-3);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: rgba(10, 10, 10, 0.55);
}

.page-about .breadcrumb a {
  color: var(--space-blue);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.25s var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--vivid-orange);
}

.page-about .breadcrumb__sep {
  color: rgba(10, 10, 10, 0.25);
}

.page-about .page-header {
  position: relative;
  padding: var(--space-5) 0 var(--space-6);
  border-bottom: 1px solid rgba(10, 10, 10, 0.08);
}

.page-about .page-header__kicker {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--vivid-orange);
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.page-about .page-header__kicker::before {
  content: "";
  width: 2.5rem;
  height: 2px;
  background: currentColor;
  display: inline-block;
}

.page-about .page-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 7vw, 4.75rem);
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--space-blue);
  margin: 0 0 var(--space-3);
  max-width: 18em;
  text-transform: uppercase;
}

.page-about .page-sub {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.75;
  color: rgba(10, 10, 10, 0.72);
  max-width: 42em;
  margin: 0;
}

.page-about .page-decor {
  display: none;
}

.page-about .section {
  padding: var(--space-5) 0;
}

.page-about .section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.875rem);
  line-height: 1.15;
  color: var(--space-blue);
  margin: 0 0 var(--space-4);
  max-width: 18em;
}

.page-about .section-kicker {
  font-family: var(--font-mono);
  font-size: var(--about-kicker-size);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--vivid-orange);
  margin-bottom: var(--space-2);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.page-about .section-kicker::before {
  content: "";
  width: 1.75rem;
  height: 2px;
  background: currentColor;
  display: inline-block;
}

.page-about .section-kicker--light {
  color: var(--golden);
}

.page-about .section-about {
  background: var(--warm-paper);
}

.page-about .section-about__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.page-about .section-about__lead {
  font-size: 1.1875rem;
  font-weight: 600;
  color: var(--space-blue);
  line-height: 1.6;
  margin-bottom: var(--space-3);
}

.page-about .section-about__content p {
  line-height: 1.75;
  color: rgba(10, 10, 10, 0.78);
  margin-bottom: var(--space-3);
}

.page-about .section-about__content .btn {
  margin-top: var(--space-2);
}

.page-about .section-about__aside {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  background: linear-gradient(135deg, var(--space-blue) 0%, #11295E 100%);
  color: var(--warm-paper);
  padding: var(--space-4) var(--space-3);
  box-shadow: var(--shadow-deep);
}

.page-about .section-about__aside::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--warm-paper);
  clip-path: polygon(0 0, 100% 100%, 0 100%);
}

.page-about .section-about__stat {
  background: rgba(245, 240, 230, 0.06);
  padding: var(--space-3) var(--space-2);
  border-left: 3px solid rgba(255, 215, 0, 0.55);
}

.page-about .section-about__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.125rem;
  font-weight: 700;
  line-height: 1.15;
  color: var(--golden);
}

.page-about .section-about__plus {
  font-size: 1.125rem;
  color: var(--vivid-orange);
}

.page-about .section-about__label {
  display: block;
  margin-top: var(--space-1);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: rgba(245, 240, 230, 0.68);
}

.page-about .section-timeline {
  background:
    linear-gradient(rgba(255, 107, 53, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 107, 53, 0.04) 1px, transparent 1px),
    var(--mist);
  background-size: 24px 24px;
}

.page-about .section-timeline__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--vivid-orange), var(--golden), rgba(11, 27, 63, 0.12));
}

.page-about .timeline__item {
  position: relative;
  padding-left: 2.25rem;
  padding-bottom: var(--space-4);
}

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

.page-about .timeline__dot {
  position: absolute;
  left: 0;
  top: 0.25rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--vivid-orange);
  border: 3px solid var(--warm-paper);
  box-shadow: 0 0 0 2px var(--vivid-orange);
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--space-blue);
  margin-bottom: var(--space-1);
}

.page-about .timeline__body h3 {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: var(--space-1);
}

.page-about .timeline__body p {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: rgba(10, 10, 10, 0.65);
}

.page-about .section-timeline__figure {
  position: relative;
  margin: 0;
  padding: var(--space-3);
  background: var(--warm-paper);
  box-shadow: var(--shadow-soft);
}

.page-about .section-timeline__figure img,
.page-about .section-capacity__figure img,
.page-about .section-ecosystem__figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about figcaption {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: rgba(10, 10, 10, 0.5);
}

.page-about .section-capacity {
  padding: var(--space-6) 0;
  background:
    linear-gradient(rgba(245, 240, 230, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(245, 240, 230, 0.03) 1px, transparent 1px),
    var(--space-blue);
  background-size: 24px 24px;
  color: var(--warm-paper);
}

.page-about .section-capacity h2 {
  color: var(--warm-paper);
}

.page-about .section-capacity__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.page-about .capacity-card {
  background: rgba(245, 240, 230, 0.06);
  border-left: 0.25rem solid var(--vivid-orange);
  padding: var(--space-3) var(--space-2);
}

.page-about .capacity-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--vivid-orange);
}

.page-about .capacity-card__label {
  display: block;
  margin-top: var(--space-1);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: rgba(245, 240, 230, 0.7);
}

.page-about .section-capacity__bottom {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  align-items: center;
}

.page-about .section-capacity__figure {
  margin: 0;
  border: 1px solid rgba(245, 240, 230, 0.14);
  box-shadow: var(--shadow-deep);
}

.page-about .section-capacity figcaption {
  color: rgba(245, 240, 230, 0.55);
}

.page-about .section-capacity__principle {
  border-left: 4px solid var(--golden);
  padding-left: var(--space-3);
  margin-bottom: var(--space-3);
}

.page-about .section-capacity__principle-mark {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--golden);
}

.page-about .section-capacity__principle p {
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--warm-paper);
  margin: var(--space-1) 0 0;
}

.page-about .section-capacity__desc {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(245, 240, 230, 0.72);
  margin: 0;
}

.page-about .section-ecosystem {
  background: var(--warm-paper);
}

.page-about .section-ecosystem__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.page-about .ecosystem-card {
  position: relative;
  background: var(--warm-paper);
  border: 1px solid rgba(10, 10, 10, 0.1);
  border-top: 0.25rem solid var(--space-blue);
  padding: var(--space-4) var(--space-3) var(--space-3);
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .ecosystem-card:hover,
.page-about .ecosystem-card:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-deep);
  border-top-color: var(--vivid-orange);
}

.page-about .ecosystem-card__index {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--vivid-orange);
  letter-spacing: 0.1em;
}

.page-about .ecosystem-card h3 {
  font-family: var(--font-display);
  font-size: 1.375rem;
  color: var(--space-blue);
  margin: var(--space-1) 0 var(--space-2);
}

.page-about .ecosystem-card p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(10, 10, 10, 0.7);
  margin-bottom: var(--space-2);
}

.page-about .ecosystem-card__more {
  margin-top: auto;
  font-size: 0.875rem;
}

.page-about .ecosystem-card__more summary {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--vivid-orange);
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

.page-about .ecosystem-card__more summary::-webkit-details-marker {
  display: none;
}

.page-about .ecosystem-card__more summary::after {
  content: "＋";
  font-family: var(--font-mono);
  color: var(--space-blue);
}

.page-about .ecosystem-card__more[open] summary::after {
  content: "－";
}

.page-about .ecosystem-card__more ul {
  margin: var(--space-2) 0 0;
  padding-left: 1.25rem;
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(10, 10, 10, 0.65);
}

.page-about .ecosystem-card__link {
  display: inline-block;
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--space-blue);
  text-decoration: none;
  border-bottom: 1px solid var(--space-blue);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .ecosystem-card__link:hover,
.page-about .ecosystem-card__link:focus-visible {
  color: var(--vivid-orange);
  border-color: var(--vivid-orange);
}

.page-about .section-ecosystem__figure {
  margin: 0;
}

@media (min-width: 768px) {
  .page-about .page-decor {
    display: block;
    position: absolute;
    right: 0;
    bottom: var(--space-4);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    color: rgba(10, 10, 10, 0.22);
    writing-mode: vertical-rl;
  }

  .page-about .section-about__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 3fr);
    gap: var(--space-5);
    align-items: start;
  }

  .page-about .section-about__aside {
    margin-top: var(--space-1);
    position: sticky;
    top: var(--space-4);
  }

  .page-about .section-timeline__layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: var(--space-5);
    align-items: start;
  }

  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 6rem 1fr;
    gap: var(--space-3);
    padding-left: 2.25rem;
  }

  .page-about .timeline__year {
    text-align: right;
    margin: 0;
    padding-top: 0.25rem;
  }

  .page-about .section-timeline__figure {
    position: sticky;
    top: var(--space-4);
  }

  .page-about .section-capacity__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .section-capacity__bottom {
    grid-template-columns: minmax(0, 4fr) minmax(0, 3fr);
    gap: var(--space-5);
  }

  .page-about .section-ecosystem__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-3);
  }
}