.page-about {
  --ab-line: var(--line);
  --ab-line-strong: var(--line-strong);
  --ab-pad: clamp(16px, 4vw, 26px);
  background: var(--ink-900);
  color: var(--text);
  font-family: var(--font-body);
  padding-bottom: clamp(48px, 8vw, 80px);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--font-display);
  color: var(--paper);
  letter-spacing: -0.03em;
}

.page-about p {
  margin: 0;
}

.page-about .breadcrumb {
  padding: 20px 0 0;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--steel-dim);
}

.page-about .breadcrumb a {
  color: var(--steel);
  text-decoration: none;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--signal);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  padding: clamp(26px, 5vw, 52px) 0 clamp(20px, 3vw, 30px);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-hero__title {
  margin-top: 14px;
  font-weight: 900;
  font-size: clamp(32px, 6.6vw, 62px);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 18px;
  margin-top: 22px;
}

.page-about .ab-hero__lede {
  font-size: 16px;
  line-height: 1.85;
  color: var(--steel);
  max-width: 62ch;
}

.page-about .ab-hero__note {
  padding-left: 16px;
  border-left: 2px solid var(--signal);
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel-dim);
  max-width: 46ch;
}

/* ---------- 摘要带 ---------- */

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

.page-about .ab-brief__cell {
  background: var(--ink-800);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-brief__k {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--steel-dim);
}

.page-about .ab-brief__v {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 24px;
  line-height: 1;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

/* ---------- 通用分节 ---------- */

.page-about .ab-origin,
.page-about .ab-scale,
.page-about .ab-flow,
.page-about .ab-years,
.page-about .ab-team,
.page-about .ab-partners {
  padding: clamp(34px, 6vw, 70px) 0;
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-origin h2,
.page-about .ab-scale h2,
.page-about .ab-flow h2,
.page-about .ab-years h2,
.page-about .ab-team h2,
.page-about .ab-partners h2 {
  margin-top: 10px;
  font-weight: 900;
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.08;
  max-width: 24ch;
}

.page-about .ab-origin h3,
.page-about .ab-year h3,
.page-about .ab-team__panel h3,
.page-about .ab-recognition h3,
.page-about .ab-topics h3,
.page-about .ab-col-note h3 {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.02em;
  margin-top: 6px;
}

.page-about .ab-origin p,
.page-about .ab-flow p,
.page-about .ab-years p,
.page-about .ab-team p,
.page-about .ab-partners p {
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
  margin-top: 12px;
}

.page-about .ab-origin a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 122, 26, 0.4);
}

.page-about .ab-origin a:hover,
.page-about .ab-origin a:focus-visible {
  border-bottom-color: var(--signal);
}

/* ---------- 图片容器 ---------- */

.page-about .ab-fig {
  margin: 0;
}

.page-about .ab-fig__frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--ab-line-strong);
  background: var(--ink-800);
}

.page-about .ab-fig__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 26, 22, 0) 42%, rgba(7, 26, 22, 0.78) 100%);
  pointer-events: none;
}

.page-about .ab-fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-cap {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.03em;
  color: var(--steel-dim);
}

/* ---------- 起点 ---------- */

.page-about .ab-origin {
  display: grid;
  gap: 26px;
}

/* ---------- 规模 ---------- */

.page-about .ab-scale__lede,
.page-about .ab-flow__lede,
.page-about .ab-team__lede,
.page-about .ab-partners__lede {
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
  margin-top: 14px;
  max-width: 64ch;
}

.page-about .ab-scale__body {
  margin-top: 28px;
  display: grid;
  gap: 24px;
}

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

.page-about .ab-metric {
  background: var(--ink-800);
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .ab-metric--lead {
  grid-column: 1 / -1;
  background: var(--ink-700);
  box-shadow: inset 2px 0 0 0 var(--signal);
  padding: 20px 18px;
}

.page-about .ab-metric__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 5vw, 34px);
  line-height: 1;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-metric--lead .ab-metric__num {
  font-size: clamp(40px, 8vw, 62px);
  color: var(--signal);
  letter-spacing: -0.02em;
}

.page-about .ab-metric__plus {
  font-size: 0.55em;
  vertical-align: super;
}

.page-about .ab-metric__label {
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.page-about .ab-metric__desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--steel-dim);
  margin-top: 4px;
  max-width: 44ch;
}

/* ---------- 核对流程 ---------- */

.page-about .ab-flow__grid {
  margin-top: 28px;
  display: grid;
  gap: 24px;
}

.page-about .ab-flow__steps {
  display: grid;
  gap: 1px;
  align-content: start;
}

.page-about .ab-step {
  background: var(--ink-800);
  border: 1px solid var(--ab-line);
  transition: box-shadow 120ms var(--ease), background 120ms var(--ease);
}

.page-about .ab-step[open] {
  background: var(--ink-700);
  box-shadow: inset 2px 0 0 0 var(--signal);
}

.page-about .ab-step__sum {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-step__sum:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: -2px;
}

.page-about .ab-step__t {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  color: var(--signal);
  min-width: 42px;
  font-variant-numeric: tabular-nums;
}

.page-about .ab-step__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--paper);
}

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

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

/* ---------- 发展历程 ---------- */

.page-about .ab-years__wrap {
  margin-top: 26px;
  display: grid;
  gap: 18px;
}

.page-about .ab-years__scale {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .ab-years__scale a {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 12px;
  border: 1px solid var(--ab-line-strong);
  text-decoration: none;
  transition: border-color 120ms var(--ease), background 120ms var(--ease);
}

.page-about .ab-years__scale a:hover,
.page-about .ab-years__scale a:focus-visible {
  border-color: var(--signal);
  background: var(--ink-700);
}

.page-about .ab-years__scale .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 16px;
  line-height: 1;
  color: var(--brass);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-years__scale em {
  font-style: normal;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--steel-dim);
}

.page-about .ab-years__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-year {
  position: relative;
  padding: 0 0 24px 0;
  border-bottom: 1px solid var(--ab-line);
  margin-bottom: 24px;
  scroll-margin-top: 96px;
}

.page-about .ab-year:last-child {
  margin-bottom: 0;
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .ab-year__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--brass);
  padding-bottom: 4px;
  border-bottom: 1px solid rgba(199, 185, 138, 0.35);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-year p {
  max-width: 68ch;
}

/* ---------- 团队 ---------- */

.page-about .ab-team__tabs {
  margin-top: 26px;
}

.page-about .ab-team__bar {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  border-bottom: 1px solid var(--ab-line-strong);
  scrollbar-width: thin;
}

.page-about .ab-team__btn {
  flex: 0 0 auto;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  color: var(--steel-dim);
  font-family: var(--font-body);
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 12px 14px;
  cursor: pointer;
  white-space: nowrap;
  transition: color 120ms var(--ease), border-color 120ms var(--ease);
}

.page-about .ab-team__btn:hover {
  color: var(--steel);
}

.page-about .ab-team__btn[aria-selected="true"] {
  color: var(--paper);
  border-bottom-color: var(--signal);
}

.page-about .ab-team__btn:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: -2px;
}

.page-about .tab-panel {
  display: block;
}

.page-about .tab-panel[hidden] {
  display: none;
}

.page-about .ab-team__panel {
  padding: 22px 0 0;
  max-width: 68ch;
}

.page-about .ab-team__panel h3 {
  color: var(--paper);
}

.page-about .ab-columnists {
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid var(--ab-line);
  display: grid;
  gap: 1px;
  background: var(--ab-line);
  border-left: 1px solid var(--ab-line);
  border-right: 1px solid var(--ab-line);
  border-bottom: 1px solid var(--ab-line);
}

.page-about .ab-col-note {
  background: var(--ink-800);
  padding: 16px;
}

.page-about .ab-col-note__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 30px;
  line-height: 1;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-col-note p {
  font-size: 13.5px;
  line-height: 1.75;
  margin-top: 8px;
}

/* ---------- 合作与认可 ---------- */

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

.page-about .ab-partner {
  background: var(--ink-800);
  padding: 18px 15px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .ab-partner__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 30px;
  line-height: 1;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-partner h3 {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-partner p {
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel-dim);
  margin-top: 2px;
}

.page-about .ab-recognition {
  margin-top: 26px;
  padding: 22px 20px;
  border: 1px solid var(--ab-line-strong);
  background:
    linear-gradient(158deg, rgba(199, 185, 138, 0.11), rgba(7, 26, 22, 0) 62%),
    var(--ink-800);
}

.page-about .ab-recognition h3 {
  color: var(--brass);
}

.page-about .ab-recognition p {
  max-width: 64ch;
}

.page-about .ab-topics {
  margin-top: 24px;
}

.page-about .ab-topics ul {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .ab-topics li {
  border: 1px solid var(--ab-line-strong);
  padding: 7px 12px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--steel);
}

/* ---------- 继续了解 ---------- */

.page-about .ab-out {
  padding: clamp(32px, 5vw, 54px) 0 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-out a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  padding: 17px 18px;
  border: 1px solid var(--ab-line);
  background: var(--ink-800);
  color: var(--paper);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.01em;
  transition: border-color 120ms var(--ease), background 120ms var(--ease);
}

.page-about .ab-out a span {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--signal);
  font-size: 14px;
}

.page-about .ab-out a:hover,
.page-about .ab-out a:focus-visible {
  border-color: var(--signal);
  background: var(--ink-700);
}

/* ---------- 平板及以上 ---------- */

@media (min-width: 720px) {
  .page-about .ab-brief {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
    gap: 32px;
  }

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

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

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

/* ---------- 桌面 ---------- */

@media (min-width: 960px) {
  .page-about .ab-origin {
    grid-template-columns: minmax(0, 1.22fr) minmax(0, 1fr);
    align-items: start;
    gap: 44px;
  }

  .page-about .ab-scale__body {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, 1fr);
    align-items: start;
    gap: 36px;
  }

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

  .page-about .ab-flow__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.72fr);
    align-items: start;
    gap: 40px;
  }

  .page-about .ab-years__wrap {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .ab-years__scale {
    flex-direction: column;
    overflow: visible;
    position: sticky;
    top: 28px;
    gap: 2px;
    padding: 0 0 0 14px;
    border-left: 1px solid var(--ab-line-strong);
  }

  .page-about .ab-years__scale a {
    border: 1px solid transparent;
    padding: 8px 6px;
  }

  .page-about .ab-years__scale a:hover,
  .page-about .ab-years__scale a:focus-visible {
    border-color: var(--ab-line-strong);
    background: transparent;
  }

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

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

  .page-about .ab-step__sum {
    padding: 17px 20px;
  }

  .page-about .ab-step__panel {
    padding: 0 20px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-out a,
  .page-about .ab-step,
  .page-about .ab-team__btn,
  .page-about .ab-years__scale a {
    transition: none;
  }
}
<<<END>>>