.page-about {
  --about-rail-w: 208px;
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- hero ---------- */
.page-about .about-hero {
  padding: 24px 0 0;
  background: var(--paper);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 26px;
  margin-top: 22px;
}

.page-about .about-hero__lead h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.2rem, 8.4vw, 4.6rem);
  line-height: 0.98;
  letter-spacing: -0.012em;
  margin: 12px 0 18px;
}

.page-about .about-hero__lead .lede {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 34em;
}

.page-about .about-hero__lead .btn-row {
  margin-top: 24px;
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--turf);
  margin: 0;
}

.page-about .about-hero .media-frame {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure .media-frame {
  aspect-ratio: 4 / 3;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .media-frame__grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line-night) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-night) 1px, transparent 1px);
  background-size: 72px 72px;
}

.page-about .media-frame__caption {
  display: block;
  margin-top: 10px;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

/* ---------- stats band ---------- */
.page-about .about-stats {
  margin-top: 34px;
  padding: 26px 0 28px;
  background: var(--pitch);
  color: var(--night);
}

.page-about .about-stats__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 12px;
  border-left: 1px solid var(--line-night);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .about-stats__label {
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--brick);
}

/* ---------- .page-about layout ---------- */
.page-about .about-body {
  padding: 38px 0 64px;
}

.page-about .about-rail {
  margin-bottom: 26px;
}

.page-about .about-rail .coord-label {
  margin: 0 0 10px;
  color: var(--brick);
}

.page-about .about-rail .coord-index {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.page-about .about-rail .coord-index__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border: 1px solid var(--line-ink);
  border-radius: var(--radius-pill);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  text-decoration: none;
  white-space: nowrap;
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background-color 180ms var(--ease);
}

.page-about .about-rail .coord-index__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--rust);
}

.page-about .about-rail .coord-index__link:hover {
  color: var(--ink);
  border-color: var(--rust-soft);
}

.page-about .about-rail .coord-index__link.is-current {
  color: var(--pitch);
  background: var(--signal);
  border-color: var(--signal);
}

.page-about .about-rail .coord-index__link.is-current .coord-index__num {
  color: var(--pitch);
}

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

/* ---------- chapters ---------- */
.page-about .about-chapter {
  padding: 34px 0;
  border-top: 1px solid var(--line-ink);
}

.page-about .about-flow > .about-chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .chapter-head {
  margin-bottom: 20px;
}

.page-about .chapter-year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.8rem, 15vw, 5.4rem);
  line-height: 0.82;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1px var(--rust-soft);
  margin-bottom: 12px;
}

.page-about .coord-label {
  margin: 0 0 8px;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--rust);
  font-family: var(--font-mono);
  text-transform: uppercase;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.55rem, 5.2vw, 2.35rem);
  line-height: 1.1;
  letter-spacing: -0.006em;
  margin: 0 0 18px;
}

.page-about .prose p {
  max-width: 34em;
  line-height: 1.9;
  margin: 0 0 1.05em;
}

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

/* ---------- note card ---------- */
.page-about .about-note-card {
  margin-top: 26px;
  padding: 20px 18px;
  border: 1px solid var(--line-ink);
  border-radius: var(--radius-md);
  background: var(--paper-tint);
}

.page-about .about-note-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-note-list li {
  display: grid;
  gap: 2px;
  padding: 11px 0;
  border-top: 1px solid var(--line-ink);
}

.page-about .about-note-list li:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .about-note-list__k {
  font-size: 0.9375rem;
  font-weight: 600;
}

.page-about .about-note-list__v {
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- coords pitch block ---------- */
.page-about .about-chapter--pit {
  margin: 10px 0;
  padding: 30px 20px 32px;
  border-top: 0;
  border-radius: var(--radius-lg);
  background: var(--pitch);
  color: var(--night);
}

.page-about .about-chapter--pit .coord-label {
  color: var(--rust-soft);
}

.page-about .about-chapter--pit .lede {
  max-width: 34em;
  line-height: 1.85;
  color: rgba(251, 243, 223, 0.78);
  margin: 0 0 6px;
}

.page-about .layer-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .layer-row {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 6px 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line-night);
}

.page-about .layer-code {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  line-height: 1;
  color: var(--signal);
}

.page-about .layer-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: 0.02em;
  margin: 0 0 6px;
}

.page-about .layer-body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(251, 243, 223, 0.82);
  max-width: 34em;
}

.page-about .layer-ex {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--brick);
}

.page-about .about-coords-tail {
  margin: 22px 0 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(251, 243, 223, 0.82);
  max-width: 34em;
}

.page-about .about-coords-tail a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

/* ---------- timeline ---------- */
.page-about .timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .timeline__item {
  position: relative;
  margin-left: 6px;
  padding: 0 0 30px 26px;
  border-left: 1px solid var(--line-ink);
}

.page-about .timeline__item:last-child {
  padding-bottom: 4px;
  border-left-color: transparent;
}

.page-about .timeline__dot {
  position: absolute;
  left: -7px;
  top: 8px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--rust);
  box-shadow: 0 0 0 3px var(--paper);
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 7.4vw, 2.7rem);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--rust);
}

.page-about .timeline__title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  line-height: 1.3;
  margin: 8px 0 8px;
}

.page-about .timeline__body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 34em;
}

.page-about .timeline__more {
  margin-top: 10px;
}

.page-about .timeline__more summary {
  cursor: pointer;
  list-style: none;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--stand);
  padding: 4px 0;
}

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

.page-about .timeline__more summary::before {
  content: "＋ ";
  font-family: var(--font-mono);
}

.page-about .timeline__more[open] summary::before {
  content: "－ ";
}

.page-about .timeline__more[open] summary {
  color: var(--rust);
}

.page-about .timeline__more p {
  margin: 8px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--rust-soft);
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 32em;
}

.page-about .about-version-note {
  margin-top: 26px;
  padding: 18px 18px 20px;
  border: 1px solid var(--line-ink);
  border-left: 3px solid var(--rust);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: var(--paper-tint);
}

.page-about .about-version-note p {
  margin: 0 0 14px;
  font-size: 0.9375rem;
  line-height: 1.8;
}

.page-about .about-version-note .btn {
  text-decoration: none;
}

/* ---------- split sections ---------- */
.page-about .about-split {
  display: grid;
  gap: 26px;
}

.page-about .about-split__text p {
  max-width: 34em;
  line-height: 1.88;
  margin: 0 0 1em;
}

.page-about .about-split__text .section-title {
  margin-bottom: 16px;
}

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

/* ---------- desk stats ---------- */
.page-about .desk-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0 0;
  background: var(--line-ink);
  border: 1px solid var(--line-ink);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .desk-stats > div {
  background: var(--paper);
  padding: 14px 16px;
}

.page-about .desk-stats dt {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}

.page-about .desk-stats dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  line-height: 1.1;
  color: var(--pitch);
}

/* ---------- clubs tint block ---------- */
.page-about .about-chapter--tint {
  margin: 10px 0;
  padding: 28px 20px 30px;
  border-top: 0;
  border-radius: var(--radius-lg);
  background: var(--paper-tint);
}

.page-about .about-chapter--tint .coord-label {
  color: var(--rust);
}

.page-about .about-chapter--tint .tag-row {
  margin-top: 18px;
}

.page-about .about-chapter--tint .tag {
  border-color: var(--rust-soft);
  color: var(--ink-soft);
  background: transparent;
}

/* ---------- next ---------- */
.page-about .about-next {
  margin-top: 10px;
  padding: 34px 0 8px;
  border-top: 1px solid var(--line-ink);
}

.page-about .next-grid {
  display: grid;
  gap: 12px;
}

.page-about .next-card {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 20px 18px 22px;
  border: 1px solid var(--line-ink);
  border-radius: var(--radius-md);
  background: var(--paper);
  color: var(--ink);
  text-decoration: none;
  transition: border-color 200ms var(--ease), transform 200ms var(--ease), background-color 200ms var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: var(--rust);
  transform: translateY(-3px);
  background: var(--paper-tint);
}

.page-about .next-card__no {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--rust);
}

.page-about .next-card__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  line-height: 1.32;
}

.page-about .next-card__desc {
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- responsive ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding-top: 30px;
  }

  .page-about .about-stats__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-stats__item {
    padding: 0 16px;
  }

  .page-about .about-stats__item:first-child {
    padding-left: 0;
  }

  .page-about .about-stats__item:last-child {
    border-right: 0;
  }

  .page-about .about-note-list li {
    grid-template-columns: minmax(0, 11em) minmax(0, 1fr);
    gap: 0 18px;
    align-items: baseline;
  }

  .page-about .layer-row {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 4px 20px;
  }

  .page-about .layer-ex {
    grid-column: 2;
    margin-top: 6px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 48px;
    align-items: end;
  }

  .page-about .about-hero .media-frame {
    aspect-ratio: 4 / 3;
  }

  .page-about .about-body {
    display: grid;
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 60px;
    align-items: start;
    padding: 52px 0 84px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    margin-bottom: 0;
    padding-right: 20px;
    border-right: 1px solid var(--line-ink);
  }

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

  .page-about .about-rail .coord-index__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 8px 0 8px 12px;
    width: 100%;
  }

  .page-about .about-rail .coord-index__link.is-current {
    background: transparent;
    border-left-color: var(--signal);
    color: var(--ink);
  }

  .page-about .about-rail .coord-index__link.is-current .coord-index__num {
    color: var(--rust);
  }

  .page-about .about-rail__note {
    display: block;
    margin: 20px 0 0;
    font-size: 0.75rem;
    line-height: 1.8;
    letter-spacing: 0.04em;
    color: var(--brick);
  }

  .page-about .about-chapter {
    padding: 44px 0;
  }

  .page-about .about-flow > .about-chapter:first-child {
    padding-top: 0;
  }

  .page-about .about-chapter--pit,
  .page-about .about-chapter--tint {
    padding: 40px 36px 44px;
    margin: 12px 0;
  }

  .page-about .layer-row {
    grid-template-columns: 60px minmax(0, 1fr) 190px;
    align-items: baseline;
    gap: 4px 24px;
  }

  .page-about .layer-ex {
    grid-column: 3;
    grid-row: 1;
    text-align: right;
    margin-top: 0;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-split--reverse {
    grid-template-columns: minmax(0, 340px) minmax(0, 1fr);
  }

  .page-about .about-split--reverse .about-split__text {
    order: 2;
  }

  .page-about .about-split--reverse .about-figure {
    order: 1;
  }

  .page-about .timeline__item {
    padding-left: 34px;
  }

  .page-about .timeline__body {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (min-width: 1140px) {
  .page-about .about-body {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 76px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: 64px;
  }

  .page-about .next-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .coord-index__link,
  .page-about .next-card {
    transition: none;
  }

  .page-about .next-card:hover,
  .page-about .next-card:focus-visible {
    transform: none;
  }
}
<<<END>>>