.page-about {
  padding-block: var(--sp-5) var(--sp-8);
}

.page-about .breadcrumb {
  margin-bottom: var(--sp-5);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  display: grid;
  gap: var(--sp-5);
  align-items: end;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.14;
  font-size: clamp(1.75rem, 7vw, 3.4rem);
  color: var(--ivory);
  margin: var(--sp-3) 0 0;
}

.page-about .about-hero__lede {
  margin-top: var(--sp-4);
  font-size: clamp(.95rem, 2.6vw, 1.0625rem);
  line-height: 1.8;
  color: rgba(255, 249, 239, .82);
}

.page-about .about-hero__body {
  margin-top: var(--sp-3);
  font-family: var(--font-body);
  font-size: .95rem;
  line-height: 1.85;
  color: var(--slate);
  max-width: 34em;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3) var(--sp-6);
  margin: var(--sp-5) 0 0;
  padding: var(--sp-3) 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: .4rem;
}

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 4vw, 1.5rem);
  color: var(--gold-bright);
  letter-spacing: .02em;
}

.page-about .about-hero__cap {
  font-size: .78rem;
  color: var(--slate);
  letter-spacing: .04em;
}

.page-about .about-hero__figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}

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

.page-about .about-hero__figure .media-frame__img {
  aspect-ratio: 4 / 5;
}

.page-about .media-frame__caption {
  font-size: .75rem;
  line-height: 1.6;
  color: var(--slate);
  padding: var(--sp-2) var(--sp-3);
  border-top: 1px solid var(--line-soft);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, .85fr);
    gap: var(--sp-7);
  }
  .page-about .about-hero__figure .media-frame__img {
    aspect-ratio: 4 / 5;
  }
  .page-about .about-hero__body {
    font-size: 1rem;
  }
}

/* ---------- Chapter index ---------- */
.page-about .about-toc {
  margin-top: var(--sp-6);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2) var(--sp-5);
  margin: 0;
  padding: var(--sp-3) 0;
  list-style: none;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: .45rem;
  font-family: var(--font-display);
  font-size: .85rem;
  color: var(--slate);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: color .3s var(--ease), border-color .3s var(--ease);
}

.page-about .about-toc__no {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--gold);
  letter-spacing: .06em;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link.is-current {
  color: var(--ivory);
  border-bottom-color: var(--gold);
}

.page-about .about-toc__link.is-current .about-toc__no {
  color: var(--gold-bright);
}

/* ---------- Sections ---------- */
.page-about .about-section {
  margin-top: var(--sp-7);
  scroll-margin-top: calc(var(--topbar-h) + 24px);
}

.page-about .section-head {
  margin-bottom: var(--sp-5);
}

.page-about .section-head__no {
  display: block;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: var(--sp-2);
}

.page-about .section-head__title {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -.01em;
  font-size: clamp(1.25rem, 4.4vw, 1.9rem);
  line-height: 1.3;
  color: var(--ivory);
  margin: 0;
}

.page-about .section-head__note {
  margin-top: var(--sp-2);
  font-size: .88rem;
  line-height: 1.7;
  color: var(--slate);
  max-width: 44em;
}

/* ---------- Timeline ---------- */
.page-about .about-timeline {
  position: relative;
  padding-left: var(--sp-5);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: .9rem;
  bottom: .9rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(201, 162, 75, .5), rgba(201, 162, 75, .08));
}

.page-about .about-year {
  position: relative;
  border-top: 1px solid var(--line-soft);
  padding: var(--sp-4) 0;
}

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

.page-about .about-year::before {
  content: "";
  position: absolute;
  left: calc(var(--sp-5) * -1 + 1px);
  top: 1.55rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 75, .14);
}

.page-about .about-year__summary {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--sp-3);
  align-items: baseline;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-year__no {
  font-family: var(--font-mono);
  font-size: clamp(1.05rem, 3.4vw, 1.45rem);
  color: var(--gold);
  letter-spacing: .04em;
}

.page-about .about-year__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: .95rem;
  line-height: 1.5;
  color: var(--ivory);
}

.page-about .about-year__mark {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--gold);
  transition: transform .3s var(--ease);
}

.page-about .about-year[open] .about-year__mark {
  transform: rotate(45deg);
}

.page-about .about-year__body {
  padding-top: var(--sp-3);
  max-width: 46em;
}

.page-about .about-year__body p {
  margin: 0;
  font-family: var(--font-body);
  font-size: .92rem;
  line-height: 1.85;
  color: rgba(255, 249, 239, .74);
}

@media (min-width: 760px) {
  .page-about .about-year__summary {
    grid-template-columns: 5.5rem 1fr auto;
  }
  .page-about .about-year__title {
    font-size: 1.05rem;
  }
}

/* ---------- Numbering map ---------- */
.page-about .about-map {
  display: grid;
  gap: var(--sp-5);
}

.page-about .about-map__text p {
  margin: 0 0 var(--sp-3);
  font-family: var(--font-body);
  font-size: .95rem;
  line-height: 1.85;
  color: rgba(255, 249, 239, .78);
  max-width: 40em;
}

.page-about .about-map__points {
  list-style: none;
  margin: var(--sp-4) 0 0;
  padding: 0;
}

.page-about .about-map__points li {
  display: flex;
  align-items: flex-start;
  gap: .65rem;
  padding: var(--sp-2) 0;
  font-size: .86rem;
  line-height: 1.7;
  color: var(--slate);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-map__dot {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  margin-top: .55rem;
  border-radius: 50%;
  background: var(--jade);
}

.page-about .about-map__figure {
  margin: 0;
  padding: var(--sp-4);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(20, 23, 25, .9), rgba(11, 13, 14, .9));
}

.page-about .about-map__svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 340px;
  margin: 0 auto;
}

.page-about .about-map__spine {
  stroke: rgba(201, 162, 75, .35);
  stroke-width: 1;
}

.page-about .about-map__node circle {
  fill: var(--ink-3);
  stroke: var(--gold);
  stroke-width: 1.4;
  transition: fill .3s var(--ease), stroke .3s var(--ease);
}

.page-about .about-map__node .about-map__name {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  fill: rgba(255, 249, 239, .86);
  transition: fill .3s var(--ease);
}

.page-about .about-map__node .about-map__code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  fill: var(--gold);
}

.page-about .about-map__node:hover circle {
  fill: var(--gold-bright);
}

.page-about .about-map__node:hover .about-map__name {
  fill: var(--gold-bright);
}

.page-about .about-map__caption {
  margin-top: var(--sp-3);
  text-align: center;
  font-size: .74rem;
  letter-spacing: .04em;
  color: var(--slate);
}

@media (min-width: 860px) {
  .page-about .about-map {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    gap: var(--sp-7);
    align-items: start;
  }
  .page-about .about-map__figure {
    padding: var(--sp-5) var(--sp-4);
  }
}

/* ---------- Team (paper layer) ---------- */
.page-about .about-team {
  --line: rgba(11, 13, 14, .2);
  --line-soft: rgba(11, 13, 14, .1);
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
  padding: var(--sp-6) var(--sp-4);
  margin-left: calc(var(--gutter) * -0.5);
  margin-right: calc(var(--gutter) * -0.5);
}

.page-about .about-team__inner {
  display: grid;
  gap: var(--sp-5);
}

.page-about .about-team__eyebrow {
  color: rgba(11, 13, 14, .55);
}

.page-about .about-team__title {
  color: var(--ink);
  margin-bottom: var(--sp-3);
}

.page-about .about-team__body {
  font-family: var(--font-body);
  font-size: .95rem;
  line-height: 1.85;
  color: rgba(11, 13, 14, .78);
  margin: 0 0 var(--sp-3);
  max-width: 40em;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--sp-4) var(--sp-3);
  margin: var(--sp-5) 0 0;
  padding: var(--sp-4) 0 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.35rem, 4.6vw, 2rem);
  line-height: 1.1;
  color: var(--ink);
  letter-spacing: -.01em;
}

.page-about .about-stats__unit {
  font-size: .55em;
  margin-left: .1em;
  color: rgba(11, 13, 14, .55);
}

.page-about .about-stats__label {
  display: block;
  margin-top: .35rem;
  font-size: .75rem;
  letter-spacing: .03em;
  color: rgba(11, 13, 14, .6);
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-team__figure .media-frame__img {
  aspect-ratio: 3 / 2;
}

.page-about .about-team__figure .media-frame__caption {
  color: rgba(11, 13, 14, .6);
  border-top-color: var(--line-soft);
}

@media (min-width: 900px) {
  .page-about .about-team {
    padding: var(--sp-7) var(--sp-6);
    margin-left: 0;
    margin-right: 0;
  }
  .page-about .about-team__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: var(--sp-6);
    align-items: start;
  }
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- Versions ---------- */
.page-about .about-version {
  display: grid;
  gap: var(--sp-5);
}

.page-about .about-version__figure {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
}

.page-about .about-version__figure .media-frame__img {
  aspect-ratio: 1 / 1;
}

.page-about .about-version__text p {
  margin: 0 0 var(--sp-3);
  font-family: var(--font-body);
  font-size: .95rem;
  line-height: 1.85;
  color: rgba(255, 249, 239, .78);
  max-width: 42em;
}

.page-about .about-fields {
  list-style: none;
  margin: var(--sp-4) 0;
  padding: 0;
  max-width: 32em;
  counter-reset: none;
}

.page-about .about-fields li {
  display: flex;
  align-items: baseline;
  gap: .9rem;
  padding: var(--sp-2) 0;
  font-size: .88rem;
  color: rgba(255, 249, 239, .86);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-fields__no {
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--gold);
  letter-spacing: .08em;
}

.page-about .about-version__hint {
  font-size: .85rem !important;
  color: var(--slate) !important;
  border-left: 2px solid var(--gold);
  padding-left: var(--sp-3);
}

@media (min-width: 860px) {
  .page-about .about-version {
    grid-template-columns: 300px minmax(0, 1fr);
    gap: var(--sp-6);
    align-items: start;
  }
}

/* ---------- Reach ---------- */
.page-about .about-reach {
  display: grid;
  gap: var(--sp-5);
}

.page-about .about-reach__item {
  border-top: 2px solid var(--line-strong);
  padding-top: var(--sp-3);
}

.page-about .about-reach__item--jade {
  border-top-color: var(--jade);
}

.page-about .about-reach__item--amber {
  border-top-color: var(--amber);
}

.page-about .about-reach__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 4.4vw, 1.9rem);
  color: var(--gold-bright);
  letter-spacing: .01em;
}

.page-about .about-reach__title {
  margin: .35rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--ivory);
}

.page-about .about-reach__text {
  margin: var(--sp-2) 0 0;
  font-size: .88rem;
  line-height: 1.8;
  color: var(--slate);
}

@media (min-width: 760px) {
  .page-about .about-reach {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--sp-5);
  }
}

/* ---------- Principle ---------- */
.page-about .about-principle {
  display: grid;
  gap: var(--sp-5);
}

.page-about .about-principle__item {
  padding: var(--sp-4) 0 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-principle__title {
  margin: var(--sp-3) 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--ivory);
}

.page-about .about-principle__text {
  margin: var(--sp-2) 0 0;
  font-family: var(--font-body);
  font-size: .9rem;
  line-height: 1.85;
  color: rgba(255, 249, 239, .72);
}

@media (min-width: 760px) {
  .page-about .about-principle {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--sp-5);
  }
}

/* ---------- Next steps ---------- */
.page-about .about-next {
  display: grid;
  gap: var(--sp-3);
  margin-top: var(--sp-6);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--line);
}

.page-about .about-next__link {
  display: block;
  padding: var(--sp-3) var(--sp-4);
  text-decoration: none;
  color: inherit;
  background: rgba(20, 23, 25, .78);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .about-next__link:hover {
  border-color: var(--line-strong);
  background: rgba(27, 33, 36, .9);
}

.page-about .about-next__label {
  display: block;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .1em;
  color: var(--gold);
  margin-bottom: .35rem;
}

.page-about .about-next__title {
  display: block;
  font-family: var(--font-display);
  font-size: .92rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ivory);
}

@media (min-width: 760px) {
  .page-about .about-next {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-year__mark,
  .page-about .about-toc__link,
  .page-about .about-next__link,
  .page-about .about-map__node circle,
  .page-about .about-map__node .about-map__name {
    transition: none;
  }
}
<<<END>>>