.page-about {
  --about-axis-w: 224px;
  --about-axis-top: 118px;
  color: var(--text-body);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.8;
  background: var(--ink-blue);
}

.page-about .mono {
  font-family: var(--font-mono);
  font-weight: 500;
  letter-spacing: .04em;
}

.page-about .breadcrumb {
  margin-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 28px 0 40px;
  border-bottom: 1px solid var(--line-gold-soft);
}

.page-about .about-eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-about .about-eyebrow .mono {
  color: var(--gold-bright);
  margin-right: 8px;
}

.page-about h1 {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(30px, 6.2vw, 52px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--text-strong);
}

.page-about .about-lede {
  margin: 0 0 14px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-body);
}

.page-about .about-lede--sub {
  color: var(--text-mute);
  font-size: 15px;
}

.page-about .about-figures {
  list-style: none;
  margin: 30px 0 0;
  padding: 1px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-gold-soft);
  border: 1px solid var(--line-gold-soft);
}

.page-about .figure-item {
  background: var(--panel);
  padding: 16px 14px 14px;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  column-gap: 4px;
}

.page-about .figure-num {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(24px, 5vw, 32px);
  line-height: 1.1;
  color: var(--gold-bright);
  grid-column: 1;
}

.page-about .figure-unit {
  grid-column: 2;
  align-self: end;
  font-size: 12px;
  color: var(--celadon);
  padding-bottom: 3px;
}

.page-about .figure-label {
  grid-column: 1 / -1;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--text-mute);
  border-top: 1px solid var(--line-soft);
  padding-top: 8px;
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding-bottom: 64px;
}

/* ---------- 年份轴 ---------- */
.page-about .about-axis {
  position: relative;
  padding: 18px 0 6px;
  border-bottom: 1px solid var(--line-gold-soft);
}

.page-about .axis-title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--celadon);
}

.page-about .axis-list {
  list-style: none;
  margin: 0;
  padding: 0 0 2px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .axis-list > li {
  flex: 0 0 auto;
}

.page-about .axis-link {
  display: fleX;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 128px;
  padding: 8px 12px;
  border: 1px solid var(--line-soft);
  background: rgba(18, 41, 63, .55);
  text-decoration: none;
  color: var(--text-mute);
  transition: border-color var(--ease), color var(--ease), background var(--ease);
}

.page-about .axis-num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--celadon);
  letter-spacing: .1em;
}

.page-about .axis-year {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text-body);
}

.page-about .axis-label {
  font-size: 12px;
  color: var(--text-mute);
}

.page-about .axis-link:hover,
.page-about .axis-link:focus-visible {
  border-color: var(--gold);
  color: var(--paper);
  background: var(--panel);
}

.page-about .axis-link[aria-current="location"] {
  border-color: var(--gold-bright);
  background: var(--panel);
  box-shadow: inset 3px 0 0 var(--gold-bright);
}

.page-about .axis-link[aria-current="location"] .axis-num,
.page-about .axis-link[aria-current="location"] .axis-year {
  color: var(--gold-bright);
}

/* ---------- 章节 ---------- */
.page-about .stage {
  padding-block: 40px;
  scroll-margin-top: 96px;
}

.page-about .stage-stamp {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--celadon);
}

.page-about .stage-stamp .mono {
  color: var(--gold);
  font-size: 13px;
}

.page-about .stage h2.section-title {
  margin: 0 0 16px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(22px, 4vw, 30px);
  line-height: 1.3;
  color: var(--text-strong);
}

.page-about .section-lede {
  max-width: 62ch;
  margin: 0 0 24px;
  font-size: 15px;
  color: var(--text-mute);
}

.page-about .stage-copy p,
.page-about .reach-body p {
  margin: 0 0 16px;
  max-width: 64ch;
}

.page-about .stage-body {
  display: grid;
  gap: 26px;
}

.page-about .stage-body--split {
  grid-template-columns: minmax(0, 1fr);
}

/* ---------- 图像 ---------- */
.page-about .stage-figure {
  margin: 0;
}

.page-about .media-frame {
  overflow: hidden;
  border: 1px solid var(--line-gold-soft);
  background: var(--ink-deep);
}

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

.page-about .media-caption {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 1px solid var(--line-gold);
  font-size: 12px;
  line-height: 1.65;
  color: var(--celadon);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0 20px;
  border-top: 1px solid var(--line-soft);
}

.page-about .tl-item:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .tl-year {
  font-size: 15px;
  color: var(--gold-bright);
}

.page-about .tl-body {
  border-left: 2px solid var(--bronze);
  padding-left: 14px;
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 18px;
  color: var(--text-strong);
}

.page-about .tl-body p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
}

/* ---------- 团队条形 ---------- */
.page-about .crew-chart {
  border-top: 1px solid var(--line-gold-soft);
}

.page-about .crew-row {
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
  transition: background var(--ease);
}

.page-about .crew-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.page-about .crew-name {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 17px;
  color: var(--text-strong);
}

.page-about .crew-count {
  font-size: 12px;
  color: var(--celadon);
  white-space: nowrap;
}

.page-about .crew-bar {
  height: 6px;
  background: rgba(143, 163, 168, .14);
  overflow: hidden;
}

.page-about .crew-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--gold), var(--gold-bright));
  transition: opacity var(--ease);
}

.page-about .crew-fill--edit { width: 43%; }
.page-about .crew-fill--archive { width: 21%; }
.page-about .crew-fill--tech { width: 26%; }
.page-about .crew-fill--service { width: 10%; }

.page-about .crew-desc {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-mute);
  transition: color var(--ease), opacity var(--ease);
}

@media (hover: hover) {
  .page-about .crew-desc { opacity: .62; }
  .page-about .crew-row:hover .crew-desc,
  .page-about .crew-row:focus-within .crew-desc { opacity: 1; color: var(--text-body); }
  .page-about .crew-row:hover { background: rgba(18, 41, 63, .5); }
  .page-about .crew-row:hover .crew-head { color: var(--gold-bright); }
}

/* ---------- 校验流程 ---------- */
.page-about .check-wrap {
  display: grid;
  gap: 26px;
}

.page-about .check-list {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .check-step {
  border: 1px solid var(--line-soft);
  background: var(--panel);
  transition: border-color var(--ease);
}

.page-about .check-step[open] {
  border-color: var(--line-gold);
}

.page-about .check-step summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 44px 14px 16px;
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

.page-about .check-step summary::after {
  content: "＋";
  position: absolute;
  right: 16px;
  top: 13px;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--gold);
}

.page-about .check-step[open] summary::after {
  content: "－";
  color: var(--gold-bright);
}

.page-about .check-step summary:focus-visible {
  outline: 2px solid var(--gold-bright);
  outline-offset: -2px;
}

.page-about .check-num {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--gold);
  white-space: nowrap;
}

.page-about .check-name {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 17px;
  color: var(--text-strong);
}

.page-about .check-body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--line-gold-soft);
}

.page-about .check-body p {
  margin: 14px 0 12px;
  font-size: 14.5px;
}

.page-about .check-items {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .check-items li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 6px;
  font-size: 13.5px;
  color: var(--text-mute);
}

.page-about .check-items li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 7px;
  height: 1px;
  background: var(--gold);
}

/* ---------- 覆盖 ---------- */
.page-about .stage-figure--wide {
  margin-bottom: 26px;
}

.page-about .pull-quote {
  margin: 26px 0 0;
  padding: 22px 22px 22px 24px;
  background: var(--paper);
  color: var(--ink-deep);
  border-left: 3px solid var(--gold);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(17px, 2.6vw, 21px);
  line-height: 1.65;
  box-shadow: var(--shadow);
}

/* ---------- 互认 ---------- */
.page-about .network-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-gold-soft);
  border: 1px solid var(--line-gold-soft);
  align-self: start;
}

.page-about .network-fact {
  margin: 0;
  padding: 16px 14px;
  background: var(--panel);
  display: grid;
  gap: 6px;
}

.page-about .network-fact-num {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 26px;
  line-height: 1.1;
  color: var(--gold-bright);
}

.page-about .network-fact-label {
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-mute);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid var(--line-gold);
}

.page-about .cta-lead {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 18px;
  color: var(--text-strong);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .cta-actions .btn {
  flex: 1 1 auto;
  text-align: center;
  min-width: 150px;
}

.page-about .cta-note {
  margin: 14px 0 0;
  font-size: 13px;
  color: var(--text-mute);
}

.page-about .cta-note a {
  color: var(--gold-bright);
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
}

.page-about .cta-note a:hover,
.page-about .cta-note a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--gold-bright);
}

/* ---------- 桌面 ---------- */
@media (min-width: 860px) {
  .page-about .about-hero {
    padding: 36px 0 52px;
  }

  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-top: 36px;
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-axis-w) minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .about-axis {
    position: sticky;
    top: var(--about-axis-top);
    padding: 46px 0 0;
    border-bottom: 0;
    border-right: 1px solid var(--line-gold-soft);
    padding-right: 20px;
  }

  .page-about .axis-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .axis-list > li {
    flex: none;
    border-left: 1px solid var(--line-soft);
  }

  .page-about .axis-link {
    min-width: 0;
    border: 0;
    background: transparent;
    padding: 10px 12px 10px 14px;
  }

  .page-about .axis-link[aria-current="location"] {
    background: linear-gradient(90deg, rgba(200, 162, 74, .12), transparent);
    box-shadow: inset 2px 0 0 var(--gold-bright);
  }

  .page-about .stage {
    padding-block: 46px;
  }

  .page-about .stage:first-child {
    padding-top: 46px;
  }

  .page-about .stage-body--split {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .stage-body--split-reverse {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
  }

  .page-about .tl-item {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 20px;
    padding: 22px 0 24px;
  }

  .page-about .tl-year {
    font-size: 16px;
    padding-top: 2px;
  }

  .page-about .check-wrap {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .check-figure .media-frame img {
    max-height: 520px;
  }

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

  .page-about .cta-actions .btn {
    flex: 0 0 auto;
    min-width: 168px;
  }
}

@media (min-width: 1120px) {
  .page-about .stage-body--split {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, .68fr);
    gap: 44px;
  }

  .page-about .about-layout {
    gap: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .axis-link,
  .page-about .crew-row,
  .page-about .crew-fill,
  .page-about .crew-desc,
  .page-about .check-step {
    transition: none;
  }
}

已在上方给出。