.page-about {
  --about-gap: clamp(18px, 3vw, 34px);
  --about-rule: 1px solid var(--line);
  background: var(--paper);
  color: var(--deep);
}

.page-about .about-crumb {
  padding-top: calc(var(--topbar-h) + 16px);
  padding-bottom: 10px;
}

.page-about .about-crumb .breadcrumb span {
  color: var(--steel);
}

/* ---------- hero ---------- */

.page-about .about-hero {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  padding-bottom: clamp(34px, 6vw, 68px);
  border-bottom: var(--about-rule);
}

.page-about .about-hero__h1 {
  margin: 12px 0 0;
  font-size: clamp(38px, 8.4vw, 92px);
  font-weight: 300;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-hero__dek {
  margin: clamp(16px, 2.4vw, 24px) 0 0;
  max-width: 52ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--carbon);
}

.page-about .about-hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(18px, 2.6vw, 26px) 0 0;
}

.page-about .about-hero__fig {
  margin: 0;
  border: var(--about-rule);
  background: var(--ink);
}

.page-about .about-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-hero__fig figcaption {
  padding: 10px 14px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--steel);
  border-top: 1px solid var(--carbon);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: var(--about-rule);
}

.page-about .about-facts__cell {
  background: var(--paper);
  padding: 16px 14px 18px;
}

.page-about .about-facts__cell dt {
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1;
  color: var(--orange);
  font-weight: 500;
}

.page-about .about-facts__cell dd {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--carbon);
}

/* ---------- .page-about layout + chapter index ---------- */

.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 54px);
  padding-block: clamp(30px, 5vw, 62px) clamp(48px, 7vw, 96px);
}

.page-about .about-index {
  border-top: 2px solid var(--orange);
  padding-top: 12px;
}

.page-about .about-index .eyebrow {
  margin: 0 0 10px;
  color: var(--steel);
}

.page-about .about-index__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  color: var(--deep);
  text-decoration: none;
  font-size: 13px;
  padding: 3px 0;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease-out), border-color 160ms var(--ease-out);
}

.page-about .about-index__list a .mono {
  font-size: 11px;
  color: var(--burnt);
  letter-spacing: 0.08em;
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--burnt);
  border-bottom-color: var(--burnt);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

/* ---------- sections ---------- */

.page-about .about-sec {
  padding-top: clamp(22px, 3.4vw, 34px);
  border-top: var(--about-rule);
}

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

.page-about .about-sec h2 {
  margin: 10px 0 0;
  font-size: clamp(25px, 3.6vw, 42px);
  font-weight: 400;
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-sec__intro {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--carbon);
}

.page-about .about-sec__body {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .about-sec .prose p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--deep);
}

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

/* ---------- certification card ---------- */

.page-about .about-cert {
  padding: 18px;
  background: var(--ink);
  color: var(--paper);
  border-left: 3px solid var(--orange);
}

.page-about .about-cert__mark {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--lime);
}

.page-about .about-cert p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--paper);
}

/* ---------- module list ---------- */

.page-about .about-modules {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: var(--about-rule);
}

.page-about .about-modules li {
  background: var(--paper);
  padding: 14px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--carbon);
}

.page-about .about-modules li .mono {
  display: inline-block;
  min-width: 26px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--burnt);
}

.page-about .about-modules li b {
  display: block;
  margin: 4px 0 3px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

/* ---------- timeline ---------- */

.page-about .about-tl-fig {
  margin: clamp(18px, 3vw, 28px) 0;
  border: var(--about-rule);
  background: var(--ink);
}

.page-about .about-tl-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 12px;
  width: 1px;
  background: var(--line);
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 4px 26px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--burnt);
  background: var(--paper);
}

.page-about .tl__item--now::before {
  border-color: var(--orange);
  background: var(--orange);
}

.page-about .tl details {
  border-bottom: var(--about-rule);
}

.page-about .tl summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 12px 26px 12px 0;
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

.page-about .tl summary::after {
  content: "+";
  position: absolute;
  right: 2px;
  top: 10px;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--burnt);
}

.page-about .tl details[open] summary::after {
  content: "–";
}

.page-about .tl summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .tl__ver {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .tl__name {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .tl__year {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--steel);
  margin-left: auto;
}

.page-about .tl details p {
  margin: 0 0 14px;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--carbon);
}

/* ---------- editorial steps ---------- */

.page-about .about-steps {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: var(--about-rule);
  counter-reset: none;
}

.page-about .about-steps li {
  background: var(--paper);
  padding: 14px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--carbon);
}

.page-about .about-steps li .mono {
  display: inline-block;
  margin-right: 8px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-steps li b {
  display: block;
  margin: 4px 0 3px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

/* ---------- team ---------- */

.page-about .about-team {
  display: grid;
  gap: 1px;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: var(--about-rule);
}

.page-about .about-team li {
  background: var(--paper);
  padding: 16px;
}

.page-about .about-team li span.mono {
  display: block;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--burnt);
}

.page-about .about-team li b {
  display: block;
  margin: 6px 0 5px;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-team li p {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--carbon);
}

.page-about .about-partners {
  margin-top: clamp(20px, 3vw, 30px);
  border-top: 2px solid var(--ink);
  padding-top: 12px;
}

.page-about .about-partners .eyebrow {
  margin: 0 0 10px;
  color: var(--steel);
}

.page-about .about-partners details {
  border-bottom: var(--about-rule);
}

.page-about .about-partners summary {
  position: relative;
  padding: 13px 26px 13px 0;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

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

.page-about .about-partners summary::after {
  content: "+";
  position: absolute;
  right: 2px;
  top: 11px;
  font-family: var(--font-mono);
  color: var(--burnt);
}

.page-about .about-partners details[open] summary::after {
  content: "–";
}

.page-about .about-partners summary:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .about-partners details p {
  margin: 0 0 14px;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.78;
  color: var(--carbon);
}

/* ---------- xinjiang dark block ---------- */

.page-about .about-sec--dark {
  background: var(--ink);
  color: var(--paper);
  border-top: 0;
  padding: clamp(22px, 4vw, 40px) clamp(18px, 3.4vw, 38px) clamp(26px, 4vw, 44px);
}

.page-about .about-sec--dark .eyebrow {
  color: var(--lime);
  margin: 0;
}

.page-about .about-sec--dark h2 {
  color: var(--paper);
  margin-top: 10px;
}

.page-about .about-dark {
  display: grid;
  gap: clamp(20px, 3.4vw, 34px);
  margin-top: clamp(18px, 2.6vw, 26px);
}

.page-about .about-dark__text p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper);
}

.page-about .about-dark__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

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

.page-about .about-map {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--carbon);
  background: var(--carbon);
}

.page-about .about-map__lines path {
  fill: none;
  stroke: var(--steel);
  stroke-width: 1;
  stroke-dasharray: 4 4;
}

.page-about .about-map__nodes circle {
  fill: var(--orange);
}

.page-about .about-map__nodes circle:nth-child(n+5) {
  fill: var(--steel);
}

.page-about .about-map__labels text {
  fill: var(--paper);
  font-family: var(--font-sans);
  font-size: 11px;
}

.page-about .about-dark__fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--carbon);
}

/* ---------- service level ---------- */

.page-about .about-sla {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: var(--about-rule);
}

.page-about .about-sla li {
  background: var(--paper);
  padding: 13px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--carbon);
}

.page-about .about-sla li .mono {
  display: inline-block;
  min-width: 62px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--burnt);
}

.page-about .about-end {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(22px, 3.4vw, 32px) 0 0;
}

/* ---------- responsive ---------- */

@media (min-width: 640px) {
  .page-about .about-modules,
  .page-about .about-team,
  .page-about .about-steps,
  .page-about .about-sla {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-crumb {
    padding-top: 34px;
  }

  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    grid-template-areas:
      "lead fig"
      "facts facts";
    align-items: start;
    column-gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-hero__lead {
    grid-area: lead;
  }

  .page-about .about-hero__fig {
    grid-area: fig;
    margin-top: 6px;
  }

  .page-about .about-facts {
    grid-area: facts;
    margin-top: 4px;
  }

  .page-about .about-sec__body {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .about-dark {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    align-items: start;
    column-gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--topbar-h) + 24px);
    align-self: start;
  }

  .page-about .about-index__list {
    display: grid;
    gap: 2px;
  }

  .page-about .about-index__list a {
    display: flex;
    width: 100%;
    padding: 6px 0;
  }

  .page-about .about-tl-fig {
    margin-right: 12%;
  }

  .page-about .about-sla {
    margin-top: -6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__list a {
    transition: none;
  }
}
<<<END>>>