.page-about {
  --ao-year-w: 78px;
  --ao-rule: 1px solid var(--stone);
}

/* ---------- 首屏分屏 ---------- */
.page-about .ao-hero {
  padding-block: clamp(28px, 5vw, 56px) clamp(40px, 6vw, 84px);
}
.page-about .ao-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
  align-items: start;
}
.page-about .ao-hero__narr .sec-num {
  margin-bottom: 18px;
}
.page-about .ao-hero__narr .display {
  margin: 0 0 24px;
  max-width: 14em;
}
.page-about .ao-hero__narr .lede {
  max-width: 34em;
  margin: 0 0 20px;
}
.page-about .ao-hero__narr .note {
  margin: 0;
  padding-top: 16px;
  border-top: var(--ao-rule);
  max-width: 34em;
}
.page-about .ao-hero__fig {
  margin: 0;
  box-shadow: var(--shadow);
}

/* ---------- 两栏版心（正文 + 目录） ---------- */
.page-about .ao-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 4vw, 56px);
}
.page-about .ao-prose {
  max-width: 34em;
}
.page-about .ao-prose p {
  margin: 0 0 1.5em;
}
.page-about .ao-prose p:last-child {
  margin-bottom: 0;
}
.page-about .ao-prose a {
  color: var(--cyan-ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(6, 122, 114, 0.35);
  transition: border-color var(--dur-micro) var(--ease);
}
.page-about .ao-prose a:hover,
.page-about .ao-prose a:focus-visible {
  border-bottom-color: var(--cyan-ink);
}
.page-about .ao-prose a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 目录 ---------- */
.page-about .ao-toc {
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-top: var(--ao-rule);
  padding-top: 14px;
}
.page-about .ao-toc__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--helan);
  text-transform: uppercase;
}
.page-about .ao-toc .toc__link {
  display: block;
  padding: 7px 0 7px 14px;
  position: relative;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink-soft);
  text-decoration: none;
  border-left: 1px solid var(--stone);
  transition: color var(--dur-micro) var(--ease), border-color var(--dur-micro) var(--ease);
}
.page-about .ao-toc .toc__link::before {
  content: "";
  position: absolute;
  left: -3.5px;
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  background: var(--stone);
  transition: background var(--dur-micro) var(--ease);
}
.page-about .ao-toc .toc__link:hover,
.page-about .ao-toc .toc__link:focus-visible {
  color: var(--ink);
}
.page-about .ao-toc .toc__link.is-on {
  color: var(--ink);
  font-weight: 600;
  border-left-color: var(--cyan-ink);
}
.page-about .ao-toc .toc__link.is-on::before {
  background: var(--cyan-ink);
}

/* ---------- 横向主题带 ---------- */
.page-about .ao-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
}
.page-about .ao-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--cyan);
}
.page-about .ao-stats__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(244, 240, 232, 0.72);
}
.page-about .band__item.ao-stats {
  display: block;
}
.page-about .ao-stats .band__item {
  padding: 18px 0;
  border-right: 1px solid rgba(244, 240, 232, 0.14);
  border-bottom: 1px solid rgba(244, 240, 232, 0.14);
  padding-inline: 16px;
}
.page-about .ao-stats .band__item--key .ao-stats__num {
  color: var(--gold);
}

/* ---------- 时间轴 ---------- */
.page-about .ao-lede {
  max-width: 34em;
  margin: 18px 0 0;
}
.page-about .ao-timeline__fig {
  margin: clamp(32px, 5vw, 56px) 0 clamp(36px, 5vw, 64px);
  box-shadow: var(--shadow);
}
.page-about .ao-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: none;
}
.page-about .ao-tl__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding-bottom: clamp(28px, 4vw, 44px);
}
.page-about .ao-tl__item:last-child {
  padding-bottom: 0;
}
.page-about .ao-tl__item:focus {
  outline: none;
}
.page-about .ao-tl__item:focus-visible {
  outline: 2px solid var(--cyan-ink);
  outline-offset: 6px;
}
.page-about .ao-tl__year {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--gold-ink);
}
.page-about .ao-tl__body {
  position: relative;
  border-left: var(--ao-rule);
  padding-left: 22px;
  max-width: 34em;
}
.page-about .ao-tl__body::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 4px;
  width: 9px;
  height: 9px;
  background: var(--gold);
  transition: background var(--dur-micro) var(--ease);
}
.page-about .ao-tl__item:hover .ao-tl__body::before,
.page-about .ao-tl__item:focus-within .ao-tl__body::before {
  background: var(--river);
}
.page-about .ao-tl__name {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
}
.page-about .ao-tl__sum {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 34em;
}
.page-about .ao-tl__more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--helan);
  max-width: 34em;
  transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), margin-top var(--dur) var(--ease);
}
.page-about .ao-tl__item:hover .ao-tl__more,
.page-about .ao-tl__item:focus-within .ao-tl__more {
  max-height: 14em;
  opacity: 1;
  margin-top: 12px;
}

/* ---------- 维护原则 ---------- */
.page-about .ao-rules {
  background: var(--paper-deep);
}
.page-about .ao-rules__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 60px);
  align-items: start;
}
.page-about .ao-rules__fig {
  margin: 0;
  box-shadow: var(--shadow);
}

/* ---------- 团队 ---------- */
.page-about .ao-table-wrap {
  margin-top: clamp(28px, 4vw, 44px);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.page-about .ao-table {
  min-width: 520px;
}
.page-about .ao-table__cap {
  caption-side: top;
  text-align: left;
  padding-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--helan);
}
.page-about .ao-collab {
  margin-top: clamp(32px, 4vw, 52px);
  border-top: var(--ao-rule);
  padding-top: 22px;
  max-width: 34em;
}
.page-about .ao-collab__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--helan);
}
.page-about .ao-collab__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .ao-collab__list li {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}
.page-about .ao-collab__tag {
  display: inline-block;
  margin-right: 10px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--orange-ink);
  border: 1px solid rgba(156, 74, 31, 0.4);
  background: rgba(184, 92, 46, 0.07);
}

/* ---------- 内容边界 ---------- */
.page-about .ao-boundary__box {
  border-left: 3px solid var(--ink);
  padding-left: clamp(20px, 3vw, 36px);
  max-width: 46em;
}
.page-about .ao-boundary__lede {
  margin: 18px 0 16px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}
.page-about .ao-boundary__note {
  margin: 0 0 26px;
  max-width: 34em;
  font-size: 14px;
  line-height: 1.85;
  color: var(--helan);
}
.page-about .ao-boundary__note a {
  color: var(--cyan-ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(6, 122, 114, 0.35);
}
.page-about .ao-boundary__note a:hover,
.page-about .ao-boundary__note a:focus-visible {
  border-bottom-color: var(--cyan-ink);
}
.page-about .ao-boundary__links {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .ao-totop__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

/* ---------- 响应式 ---------- */
@media (max-width: 899px) {
  .page-about .ao-tl__more {
    max-height: none;
    opacity: 1;
    margin-top: 10px;
  }
  .page-about .ao-tl__body {
    max-width: 100%;
  }
  .page-about .ao-boundary__links .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

@media (min-width: 900px) {
  .page-about .ao-hero__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: clamp(40px, 5vw, 72px);
  }
  .page-about .ao-hero__narr {
    padding-top: clamp(12px, 2vw, 32px);
  }
  .page-about .ao-hero__fig {
    margin-top: clamp(0px, 1vw, 16px);
  }
  .page-about .ao-stats {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .page-about .ao-stats .band__item {
    border-bottom: none;
  }
  .page-about .ao-stats .band__item:last-child {
    border-right: none;
  }
  .page-about .ao-tl__item {
    grid-template-columns: var(--ao-year-w) minmax(0, 1fr);
    gap: 0 28px;
    align-items: start;
  }
  .page-about .ao-rules__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 1040px) {
  .page-about .ao-layout {
    grid-template-columns: minmax(0, 1fr) 208px;
    gap: clamp(48px, 5vw, 88px);
  }
  .page-about .ao-aside {
    position: sticky;
    top: calc(var(--top-h) + 24px);
    align-self: start;
  }
  .page-about .ao-tl__item {
    --ao-year-w: 96px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ao-tl__more,
  .page-about .ao-tl__body::before,
  .page-about .ao-toc .toc__link,
  .page-about .ao-toc .toc__link::before {
    transition: none;
  }
}
</final>
</answer>