.page-about {
  --about-soft: #B9C2B8;
  --about-ink-soft: #C9CFC6;
  --about-sticky-top: 104px;
  background: var(--night);
  color: var(--paper);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  border-bottom: var(--hair) solid var(--line);
  background:
    linear-gradient(180deg, rgba(53, 196, 106, .05), transparent 42%),
    var(--night);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
  padding-block: clamp(22px, 4vw, 44px) clamp(30px, 5vw, 60px);
}

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

.page-about .about-hero__eyebrow {
  margin: 16px 0 12px;
  color: var(--muted);
  letter-spacing: .18em;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.9rem, 6.4vw, 3.5rem);
  line-height: 1.06;
  letter-spacing: -.01em;
  margin: 0 0 18px;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 48ch;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: var(--hair) solid var(--line);
}

.page-about .about-hero__facts li {
  background: var(--night);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-about .about-hero__facts .label {
  color: var(--muted);
}

.page-about .about-hero__facts strong {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  font-size: 21px;
  line-height: 1;
  color: var(--amber);
}

.page-about .about-hero__media {
  margin: 0;
  border: var(--hair) solid var(--line);
  background: var(--charcoal);
  aspect-ratio: 5 / 6;
  overflow: hidden;
}

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

.page-about .about-hero__media .media-frame__caption {
  color: var(--about-soft);
}

/* ---------- 规模数据条 ---------- */

.page-about .about-scale {
  background: var(--charcoal);
  border-bottom: var(--hair) solid var(--line);
}

.page-about .about-scale .container {
  padding-block: clamp(26px, 4vw, 44px);
}

.page-about .about-scale__title {
  margin: 0 0 14px;
  color: var(--moss);
  letter-spacing: .2em;
}

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

.page-about .about-scale__cell {
  background: var(--charcoal);
  padding: 20px 16px 22px;
  min-width: 0;
}

.page-about .about-scale__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  font-size: clamp(1.7rem, 4.6vw, 2.5rem);
  line-height: 1;
  color: var(--amber);
}

.page-about .about-scale__unit {
  display: block;
  margin-top: 9px;
  font-size: 14px;
  color: var(--paper);
}

.page-about .about-scale__note {
  margin: 7px 0 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 通用左窄右宽区块 ---------- */

.page-about .about-section {
  border-bottom: var(--hair) solid var(--line);
}

.page-about .about-section__grid {
  display: grid;
  gap: 18px;
  padding-block: clamp(34px, 6vw, 68px);
}

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

.page-about .about-section__aside .label {
  display: inline-block;
  padding-top: 7px;
  border-top: 2px solid var(--pitch);
  color: var(--moss);
  letter-spacing: .2em;
}

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

.page-about .about-section__body h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.45rem, 3.4vw, 2.15rem);
  line-height: 1.16;
  letter-spacing: -.005em;
  margin: 0 0 16px;
  color: var(--paper);
}

.page-about .about-section__body > p {
  margin: 0 0 14px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

/* ---------- 观察员分布 ---------- */

.page-about .about-map {
  margin-top: 30px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
}

.page-about .about-map__node {
  position: relative;
  padding-top: 24px;
  border-top: var(--hair) solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 7px;
  min-width: 0;
}

.page-about .about-map__dot {
  position: absolute;
  top: -4.5px;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--pitch);
}

.page-about .about-map__city {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  letter-spacing: .05em;
  color: var(--paper);
  line-height: 1;
}

.page-about .about-map__meta {
  color: var(--muted);
  letter-spacing: .04em;
}

/* ---------- 数据流程 ---------- */

.page-about .about-flow {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: var(--hair) solid var(--line);
}

.page-about .about-flow__step {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: var(--hair) solid var(--line);
}

.page-about .about-flow__idx {
  color: var(--amber);
  padding-top: 4px;
}

.page-about .about-flow__step h3 {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 19px;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--about-ink-soft);
  max-width: 58ch;
}

.page-about .about-flow__rhythm {
  margin: 22px 0 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--about-ink-soft);
  border-left: 2px solid var(--amber);
  padding-left: 16px;
}

.page-about .about-flow__figure {
  margin: 28px 0 0;
  width: min(100%, 400px);
  border: var(--hair) solid var(--line);
  background: var(--charcoal);
  aspect-ratio: 1 / 1;
  overflow: hidden;
}

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

/* ---------- 更正说明 ---------- */

.page-about .about-correction {
  margin-top: 6px;
  border-left: 2px solid var(--signal);
  padding-left: 18px;
  max-width: 58ch;
}

.page-about .about-correction p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--paper);
}

/* ---------- 发展历程 ---------- */

.page-about .about-history {
  border-bottom: var(--hair) solid var(--line);
  background:
    linear-gradient(180deg, rgba(74, 107, 82, .16), transparent 60%),
    var(--night);
}

.page-about .about-history .container {
  padding-block: clamp(34px, 6vw, 68px);
}

.page-about .about-history__head {
  max-width: 62ch;
  margin-bottom: 26px;
}

.page-about .about-history__eyebrow {
  display: inline-block;
  padding-top: 7px;
  border-top: 2px solid var(--pitch);
  color: var(--moss);
  letter-spacing: .2em;
  margin-bottom: 14px;
}

.page-about .about-history__head h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.45rem, 3.6vw, 2.3rem);
  line-height: 1.14;
  margin: 0 0 12px;
  color: var(--paper);
}

.page-about .about-history__intro {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.page-about .about-history__tabs .tabs__list {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  border-bottom: var(--hair) solid var(--line);
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-history__tabs .tabs__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-history__tabs .tabs__tab {
  flex: 0 0 auto;
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  letter-spacing: .08em;
  padding: 12px 15px 10px;
  cursor: pointer;
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-about .about-history__tabs .tabs__tab:hover {
  color: var(--paper);
}

.page-about .about-history__tabs .tabs__tab[aria-selected="true"] {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.page-about .about-history__tabs .tabs__tab:focus-visible {
  outline: 2px solid var(--pitch);
  outline-offset: -2px;
}

.page-about .about-history__panels {
  position: relative;
  padding-top: 26px;
}

.page-about .about-history__panels::before {
  content: "";
  position: absolute;
  left: 0;
  top: 30px;
  bottom: 4px;
  width: 1px;
  background: var(--line);
}

.page-about .about-history__panels .tabs__panel {
  position: relative;
  padding-left: 28px;
}

.page-about .about-history__panels .tabs__panel::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 11px;
  height: 11px;
  background: var(--amber);
}

.page-about .about-history__year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--amber);
}

.page-about .about-history__panels .tabs__panel p {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

/* ---------- 整宽横幅 ---------- */

.page-about .about-banner {
  margin: 0;
  border-bottom: var(--hair) solid var(--line);
  background: var(--charcoal);
  position: relative;
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 2 / 1;
}

.page-about .about-banner .media-frame__caption {
  position: absolute;
  left: var(--gutter);
  bottom: 16px;
  right: var(--gutter);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  text-shadow: 0 1px 8px rgba(14, 31, 26, .9);
}

/* ---------- 合作生态内的行内链接 ---------- */

.page-about .about-inline-link {
  display: inline-block;
  color: var(--pitch);
  text-decoration: none;
  border-bottom: var(--hair) solid var(--pitch);
  padding-bottom: 2px;
  font-size: 15px;
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-about .about-inline-link:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.page-about .about-inline-link:focus-visible {
  outline: 2px solid var(--pitch);
  outline-offset: 3px;
}

/* ---------- 承诺条目 ---------- */

.page-about .about-section--last {
  border-bottom: 0;
}

.page-about .about-pledges {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: var(--hair) solid var(--line);
}

.page-about .about-pledges__item {
  background: var(--night);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 11px;
  min-width: 0;
  transition: background var(--mid) var(--ease);
}

.page-about .about-pledges__item:hover {
  background: #12251E;
}

.page-about .about-pledges__idx {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--amber);
}

.page-about .about-pledges__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.74;
  color: var(--paper);
}

.page-about .about-pledges__link {
  margin-top: auto;
  align-self: flex-start;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  border-bottom: var(--hair) solid var(--line);
  padding-bottom: 2px;
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

.page-about .about-pledges__item:hover .about-pledges__link,
.page-about .about-pledges__link:focus-visible {
  color: var(--pitch);
  border-bottom-color: var(--pitch);
}

.page-about .about-pledges__link:focus-visible {
  outline: 2px solid var(--pitch);
  outline-offset: 3px;
}

/* ---------- 结尾指引 ---------- */

.page-about .about-cta {
  background: var(--charcoal);
  border-top: var(--hair) solid var(--line);
}

.page-about .about-cta__inner {
  padding-block: clamp(32px, 5.5vw, 60px);
  display: grid;
  gap: 14px;
}

.page-about .about-cta h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.4rem, 3.2vw, 2rem);
  line-height: 1.16;
  margin: 0;
  color: var(--paper);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--about-ink-soft);
}

.page-about .about-cta__links {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .about-scale__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .about-section__grid {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-section__aside {
    position: sticky;
    top: var(--about-sticky-top);
    align-self: start;
  }

  .page-about .about-flow {
    margin-top: 28px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-section__grid {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 64px;
  }

  .page-about .about-hero__media {
    aspect-ratio: 6 / 7;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-pledges__item,
  .page-about .about-pledges__link,
  .page-about .about-inline-link,
  .page-about .about-history__tabs .tabs__tab {
    transition: none;
  }
}
<<<END>>>