.page-about {
  --about-rail: 282px;
  --about-gap: clamp(24px, 4vw, 56px);
  background: var(--ink-900);
  color: var(--frost);
  overflow-x: clip;
}

.page-about a {
  color: inherit;
}

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  filter: saturate(0.6) contrast(1.05);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(4, 20, 15, 0.62) 0%, rgba(7, 27, 22, 0.92) 60%, var(--ink-900) 100%);
}

.page-about .about-hero__inner {
  padding-block: clamp(44px, 8vw, 96px);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(28px, 5.4vw, 60px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--frost);
  max-width: 20em;
}

.page-about .about-hero__lead {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 62ch;
  color: var(--paper-dim);
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.78;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(20px, 4vw, 56px);
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding-top: clamp(16px, 2.4vw, 24px);
  border-top: 1px solid var(--line);
}

.page-about .about-hero__meta > div {
  display: grid;
  gap: 6px;
}

.page-about .about-hero__meta dt {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-hero__meta dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--mint);
}

.page-about .about-body {
  padding-block: clamp(28px, 5vw, 64px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-rail {
  border: 1px solid var(--line);
  background: var(--ink-800);
  padding: 14px;
}

.page-about .about-rail__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-index {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .about-index__num {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--line);
  transition: color 180ms var(--ease);
}

.page-about .about-index__link:hover {
  color: var(--frost);
  background: rgba(57, 255, 194, 0.07);
  border-left-color: var(--mint);
}

.page-about .about-index__link:hover .about-index__num {
  color: var(--mint);
}

.page-about .about-index__link:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
}

.page-about .about-section {
  scroll-margin-top: 96px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding-block: clamp(28px, 4.5vw, 52px);
  border-top: 1px solid var(--line);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-section__num {
  display: block;
  font-size: clamp(46px, 8vw, 104px);
  line-height: 0.86;
  letter-spacing: 0.02em;
  color: var(--ink-800);
  -webkit-text-stroke: 1px var(--line);
}

.page-about .about-section__label {
  display: block;
  margin-top: 12px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-section__content {
  min-width: 0;
}

.page-about .about-section__title {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(21px, 2.7vw, 33px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--frost);
}

.page-about .about-section__content p {
  margin: 0 0 14px;
  max-width: 64ch;
  font-size: clamp(15px, 1.55vw, 17px);
  line-height: 1.8;
  color: var(--paper-dim);
}

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

.page-about .about-section__content a {
  color: var(--mint);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 160ms var(--ease);
}

.page-about .about-section__content a:hover {
  color: var(--frost);
}

.page-about .about-section__content a:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 2px;
}

.page-about .about-stats {
  display: grid;
  margin: clamp(18px, 3vw, 26px) 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-stats > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-stats dt {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .about-stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--mint);
  white-space: nowrap;
}

.page-about .timeline {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(210px, 1fr);
  gap: 14px;
  overflow-x: auto;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 8px 4px 16px;
  border-top: 1px solid var(--line);
  scroll-snap-type: x proximity;
}

.page-about .timeline__item {
  position: relative;
  scroll-snap-align: start;
  padding: 20px 16px 22px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--line);
  background: var(--ink-800);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 16px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--line);
}

.page-about .timeline__item--current {
  border-color: var(--amber);
  box-shadow: var(--shadow-amber);
}

.page-about .timeline__item--current::before {
  background: var(--amber);
  box-shadow: 0 0 0 3px rgba(242, 180, 65, 0.22);
}

.page-about .timeline__era {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .timeline__item--current .timeline__era {
  color: var(--amber);
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 18px;
  line-height: 1.35;
  color: var(--frost);
}

.page-about .timeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper-dim);
}

.page-about .about-figure {
  margin: clamp(18px, 3vw, 26px) 0 0;
}

.page-about .about-figure__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(0.78);
}

.page-about .about-figure__cap {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.06em;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-assets {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}

.page-about .about-assets__item {
  display: grid;
  gap: 4px;
  padding: 16px 14px 18px;
  border: 1px solid var(--line);
  background: var(--ink-800);
}

.page-about .about-assets__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--mint);
}

.page-about .about-assets__unit {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--frost);
}

.page-about .about-assets__desc {
  font-size: 12px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-principles {
  display: grid;
  gap: 14px;
  margin: clamp(18px, 3vw, 26px) 0 clamp(18px, 3vw, 26px);
}

.page-about .about-principle {
  padding: 20px 18px 22px;
  border: 1px solid var(--paper-dim);
  box-shadow: 4px 4px 0 0 var(--line);
  transition: transform 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .about-principle:hover {
  transform: translateY(-2px);
  box-shadow: 6px 6px 0 0 var(--mint-deep);
}

.page-about .about-principle__tag {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mint-deep);
}

.page-about .about-principle__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 19px;
  line-height: 1.36;
  color: #06201A;
}

.page-about .about-principle__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: #24463C;
}

.page-about .about-eco {
  display: grid;
  gap: 12px;
  margin: clamp(18px, 3vw, 26px) 0;
}

.page-about .about-eco__card {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 4px 10px;
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--mint);
  background: var(--ink-800);
}

.page-about .about-eco__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--mint);
}

.page-about .about-eco__unit {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--frost);
}

.page-about .about-eco__label {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  max-width: none;
  font-size: 13px;
  line-height: 1.7;
  color: var(--paper-dim);
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

@media (min-width: 720px) {
  .page-about .about-section {
    grid-template-columns: minmax(94px, 150px) minmax(0, 1fr);
    gap: clamp(18px, 3vw, 40px);
  }

  .page-about .about-eco {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    padding: 18px 16px;
  }

  .page-about .about-index {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    flex: initial;
    white-space: normal;
  }

  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-principle,
  .page-about .about-section__content a {
    transition: none;
  }

  .page-about .about-principle:hover {
    transform: none;
  }
}