.page-about {
  --rail-w: 212px;
  --dot-size: 9px;
}

/* 顶部上下文 */
.page-about .about-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 24px;
  padding-top: 22px;
}

.page-about .about-crumb .breadcrumb {
  margin: 0;
}

.page-about .topbar-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--sage);
}

/* 外壳：左侧对照栏 + 右侧正文 */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  padding: 24px 0 72px;
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
    gap: 56px;
    padding-top: 32px;
  }
}

.page-about .about-rail {
  border-top: 1px solid var(--rule);
  padding-top: 14px;
}

.page-about .rail-block + .rail-block {
  margin-top: 20px;
}

.page-about .rail-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sage);
}

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

.page-about .rail-years a {
  display: block;
  padding: 6px 10px;
  border: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .rail-years a:hover,
.page-about .rail-years a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan-dim);
  background: var(--cyan-veil);
}

.page-about .rail-block--sections {
  display: none;
}

.page-about .rail-links {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .rail-links a {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
  padding: 7px 0;
  border-bottom: 1px solid var(--rule-soft);
  font-size: 13.5px;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.18s ease;
}

.page-about .rail-links a span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan-dim);
}

.page-about .rail-links a:hover,
.page-about .rail-links a:focus-visible {
  color: var(--cyan);
}

@media (min-width: 1024px) {
  .page-about .about-rail {
    position: sticky;
    top: 94px;
    align-self: start;
  }

  .page-about .rail-block--sections {
    display: block;
  }

  .page-about .rail-years {
    flex-direction: column;
    gap: 2px;
  }

  .page-about .rail-years a {
    padding: 5px 8px 5px 12px;
    border: 1px solid transparent;
    border-left: 2px solid var(--rule);
  }

  .page-about .rail-years a:hover,
  .page-about .rail-years a:focus-visible {
    border-color: transparent;
    border-left-color: var(--cyan);
    background: var(--cyan-veil);
  }
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: 30px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text);
  max-width: 13em;
}

@media (min-width: 768px) {
  .page-about .about-hero h1 {
    font-size: 40px;
  }
}

.page-about .hero-lede {
  margin: 16px 0 0;
  max-width: var(--measure);
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-about .hero-panel {
  background: var(--ink-900);
  border: 1px solid var(--rule);
  padding: 18px 18px 20px;
}

.page-about .panel-label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sage);
}

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

.page-about .panel-list li + li {
  border-top: 1px solid var(--rule-soft);
}

.page-about .panel-list a {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 10px;
  align-items: baseline;
  padding: 10px 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--text);
  text-decoration: none;
  transition: color 0.18s ease;
}

.page-about .panel-list a span {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .panel-list a:hover,
.page-about .panel-list a:focus-visible {
  color: var(--cyan);
}

.page-about .hero-panel .btn {
  margin-top: 16px;
  width: 100%;
  justify-content: center;
}

/* 章节通用 */
.page-about .about-section {
  margin-top: 54px;
}

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px 14px;
  align-items: start;
  padding-top: 13px;
  border-top: 1px solid var(--rule);
}

.page-about .about-head .section-index {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
  line-height: 1.34;
  letter-spacing: -0.015em;
  color: var(--text);
}

@media (min-width: 768px) {
  .page-about .about-head h2 {
    font-size: 28px;
  }
}

.page-about .about-prose {
  margin-top: 20px;
}

.page-about .about-prose p {
  margin: 0 0 14px;
  max-width: var(--measure);
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text);
}

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

.page-about .split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 20px;
}

@media (min-width: 900px) {
  .page-about .split--wide {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 46px;
  }

  .page-about .split--even {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 40px;
  }
}

/* 常见来访 */
.page-about .who-block {
  margin-top: 4px;
}

.page-about .who-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-about .who-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--rule-soft);
}

.page-about .who-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--rule-soft);
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text-muted);
}

.page-about .who-list strong {
  display: block;
  margin-bottom: 3px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text);
}

/* 时间线 */
.page-about .tl-intro {
  margin: 20px 0 0;
  max-width: var(--measure);
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .tl-figure {
  margin: 24px 0 0;
}

.page-about .tl-list {
  position: relative;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

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

.page-about .tl-node {
  position: relative;
  padding: 0 0 18px 30px;
  border-bottom: 1px solid var(--rule-soft);
}

.page-about .tl-node:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 19px;
  width: var(--dot-size);
  height: var(--dot-size);
  background: var(--ink-950);
  border: 1px solid var(--cyan-dim);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.page-about .tl-node:target::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .tl-node summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 22px;
  gap: 6px 14px;
  align-items: baseline;
  padding: 14px 0 4px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-node summary::marker {
  content: "";
}

.page-about .tl-node summary:focus-visible {
  outline: 1px solid var(--cyan-dim);
  outline-offset: 4px;
}

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .tl-title {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
}

.page-about .tl-toggle {
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--cyan-dim);
}

.page-about .tl-toggle::before {
  content: "+";
}

.page-about .tl-node details[open] .tl-toggle::before {
  content: "–";
}

.page-about .tl-body {
  padding: 8px 0 4px;
}

.page-about .tl-body p {
  margin: 0 0 10px;
  max-width: var(--measure);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-muted);
}

.page-about .tl-body .tl-meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--sage);
}

/* 规模台账 */
.page-about .scale-panel {
  margin-top: 20px;
  padding: 22px 18px 10px;
  background: var(--ink-900);
  border: 1px solid var(--rule);
}

@media (min-width: 768px) {
  .page-about .scale-panel {
    padding: 28px 28px 14px;
  }
}

.page-about .scale-intro {
  margin: 0 0 18px;
  max-width: var(--measure);
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-muted);
}

.page-about .scale-ledger {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule-soft);
}

.page-about .scale-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px 24px;
  padding: 14px 0;
  border-bottom: 1px solid var(--rule-soft);
}

@media (min-width: 720px) {
  .page-about .scale-row {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    gap: 0 24px;
  }
}

.page-about .scale-row dt {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--sage);
}

.page-about .scale-row dd {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 10px;
}

.page-about .scale-num {
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .scale-unit {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-muted);
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin-top: 22px;
}

@media (min-width: 960px) {
  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.75fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }
}

.page-about .team-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 16px;
  padding: 16px 0 16px 14px;
  border-top: 1px solid var(--rule-soft);
  border-left: 2px solid transparent;
  transition: border-left-color 0.2s ease;
}

.page-about .team-main .team-row:last-child {
  border-bottom: 1px solid var(--rule-soft);
}

.page-about .team-row:hover,
.page-about .team-row:focus-within {
  border-left-color: var(--cyan);
}

.page-about .team-row h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.4;
  color: var(--text);
}

.page-about .team-count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .team-desc {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  max-width: 36em;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-muted);
}

.page-about .team-detail {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.03em;
  line-height: 1.7;
  color: var(--sage);
  transition: color 0.2s ease;
}

.page-about .team-row:hover .team-detail,
.page-about .team-row:focus-within .team-detail {
  color: var(--cyan-dim);
}

.page-about .team-side {
  padding: 18px;
  background: var(--ink-900);
  border: 1px solid var(--rule);
}

.page-about .side-label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--sage);
}

.page-about .side-total {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 42px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .side-total span {
  margin-left: 8px;
  font-family: var(--font-body);
  font-size: 12.5px;
  letter-spacing: 0;
  color: var(--sage);
}

.page-about .side-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--rule-soft);
}

.page-about .side-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--rule-soft);
  font-size: 13.5px;
  color: var(--text-muted);
}

.page-about .side-list strong {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--text);
}

.page-about .side-note {
  margin: 12px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--sage);
}

.page-about .team-figure {
  margin: 30px 0 0;
}

/* 维护 */
.page-about .review-figure {
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .review-figure {
    margin-top: 20px;
  }
}

/* 行动按钮 */
.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 后续入口 */
.page-about .about-next {
  margin-top: 54px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
}

.page-about .next-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: -0.01em;
  color: var(--text);
}

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

.page-about .next-list a {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 18px;
  gap: 4px 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--rule-soft);
  text-decoration: none;
  transition: background-color 0.18s ease;
}

.page-about .next-tag {
  grid-column: 1;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .next-text {
  grid-column: 1;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--text);
}

.page-about .next-arrow {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: center;
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--cyan-dim);
  transition: color 0.18s ease, transform 0.18s ease;
}

.page-about .next-list a:hover,
.page-about .next-list a:focus-visible {
  background: var(--cyan-veil);
}

.page-about .next-list a:hover .next-arrow,
.page-about .next-list a:focus-visible .next-arrow {
  color: var(--cyan);
}

/* 图片容器内元素 */
.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

@media (min-width: 768px) {
  .page-about .about-section {
    margin-top: 64px;
  }

  .page-about .about-next {
    margin-top: 64px;
  }
}
<<<PAGE_CSS_END>>>