.page-about {
  --about-rail-w: 200px;
  --about-gap: clamp(20px, 3.4vw, 36px);
}

/* 面包屑与首屏 */
.page-about .breadcrumbs {
  padding-block: clamp(14px, 2vw, 22px) 0;
}

.page-about .about-hero {
  padding-block: clamp(16px, 3vw, 28px) clamp(24px, 4.5vw, 52px);
}

.page-about .about-frame {
  position: relative;
  border: 1px solid var(--line-soft);
  padding: clamp(20px, 3.6vw, 46px) clamp(18px, 3.2vw, 42px) clamp(22px, 4vw, 48px);
  background:
    linear-gradient(var(--grid-line) 1px, transparent 1px) 0 0 / 100% 44px,
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px) 0 0 / 44px 100%;
}

.page-about .about-frame::before,
.page-about .about-frame::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 1px solid var(--ink);
  opacity: .38;
}

.page-about .about-frame::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-frame::after {
  bottom: -1px;
  right: -1px;
  border-left: 0;
  border-top: 0;
}

.page-about .about-frame-label {
  display: inline-block;
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--muted);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-ghost);
  width: 100%;
  margin-bottom: clamp(16px, 3vw, 28px);
}

.page-about .about-frame-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.4vw, 40px);
}

.page-about .about-title {
  margin: 0 0 16px;
  max-width: 17ch;
}

.page-about .about-lede {
  max-width: 34em;
  margin: 0;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}

.page-about .about-hero-stat {
  border-top: 2px solid var(--ink);
  padding-top: 10px;
  display: flex;
  flex-direction: column-reverse;
  gap: 4px;
}

.page-about .about-hero-stat .stat-label {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--muted);
}

.page-about .about-hero-num {
  font-size: clamp(26px, 4.4vw, 42px);
  line-height: 1;
  color: var(--ink);
  font-weight: 700;
  letter-spacing: -.02em;
}

.page-about .about-unit {
  font-size: .42em;
  margin-left: 3px;
  color: var(--muted);
  font-weight: 400;
}

@media (min-width: 920px) {
  .page-about .about-frame-grid {
    grid-template-columns: minmax(0, 1fr) 300px;
    align-items: end;
  }

  .page-about .about-hero-stats {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

  .page-about .about-hero-stat {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    gap: 14px;
  }
}

/* 主体骨架 */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  padding-bottom: clamp(44px, 6vw, 84px);
}

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

.page-about .about-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .about-index .index-rail-title {
  display: none;
}

.page-about .about-rail-list .index-link {
  display: inline-block;
  font-size: 12px;
  line-height: 1.4;
  padding: 5px 11px;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line-ghost);
  background: var(--sand-2);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-rail-list .index-link:hover,
.page-about .about-rail-list .index-link[aria-current="true"] {
  color: var(--ink);
  border-color: var(--mint);
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(30px, 3.6vw, 56px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 22px;
  }

  .page-about .about-index .index-rail-title {
    display: block;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .2em;
    color: var(--muted);
    margin: 0 0 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--line-soft);
  }

  .page-about .about-rail-list {
    flex-direction: column;
    gap: 0;
    border-left: 1px solid var(--line-ghost);
  }

  .page-about .about-rail-list li {
    position: relative;
  }

  .page-about .about-rail-list .index-link {
    display: block;
    border: 0;
    background: transparent;
    padding: 8px 0 8px 14px;
    border-radius: 0;
    font-size: 13px;
    color: var(--muted);
  }

  .page-about .about-rail-list .index-link:hover,
  .page-about .about-rail-list .index-link[aria-current="true"] {
    color: var(--ink);
    box-shadow: inset 2px 0 0 var(--mint);
    background: rgba(37, 224, 174, .07);
  }
}

/* 章节通用 */
.page-about .about-main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(38px, 6vw, 76px);
}

.page-about .about-section {
  scroll-margin-top: 24px;
}

.page-about .about-head {
  position: relative;
  margin-bottom: clamp(18px, 3vw, 28px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 46px;
  height: 2px;
  background: var(--mint);
}

.page-about .about-head .section-title {
  margin: 0 0 6px;
  max-width: 22ch;
}

.page-about .about-head .section-kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .about-idx {
  display: none;
}

@media (min-width: 900px) {
  .page-about .about-idx {
    display: block;
    position: absolute;
    left: -42px;
    top: 2px;
    transform: rotate(90deg);
    transform-origin: left top;
    font-size: 11px;
    letter-spacing: .3em;
    color: var(--line);
  }
}

/* 名字与起点 */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
}

.page-about .about-split-text p {
  margin: 0 0 14px;
}

.page-about .about-split-text p:first-child::first-letter {
  font-size: 2.2em;
  line-height: 1;
  float: left;
  margin: 4px 8px 0 0;
  color: var(--brick);
  font-weight: 700;
}

.page-about .about-figure {
  position: relative;
  overflow: hidden;
  background: var(--night-2);
  aspect-ratio: 3 / 2;
  border: 1px solid var(--line-ghost);
}

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

.page-about .about-figure--tall {
  aspect-ratio: 3 / 4;
}

.page-about .about-caption {
  margin: 8px 0 0;
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--muted);
  line-height: 1.5;
}

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }
}

/* 时间线 */
.page-about .timeline-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(18px, 3vw, 26px);
}

.page-about .timeline-jump a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  padding: 5px 13px 6px;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  background: var(--sand-2);
  transition: color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .timeline-jump a:hover,
.page-about .timeline-jump a:focus-visible {
  color: var(--ink);
  border-color: var(--gold);
  transform: translateY(-2px);
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: var(--line-soft);
}

.page-about .timeline-item {
  position: relative;
  padding-bottom: clamp(16px, 2.6vw, 24px);
}

.page-about .timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--sand);
  border: 1px solid var(--mint);
  box-shadow: inset 0 0 0 2px var(--sand), 0 0 0 3px rgba(37, 224, 174, .14);
}

.page-about .timeline-year {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--muted);
  font-weight: 600;
}

.page-about .timeline-card {
  position: relative;
  background: var(--sand-2);
  border: 1px solid var(--line-ghost);
  padding: clamp(14px, 2.4vw, 20px) clamp(14px, 2.4vw, 22px);
  box-shadow: var(--shadow-card);
  transition: transform .25s var(--ease), border-color .25s var(--ease);
}

.page-about .timeline-card::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 14px;
  height: 14px;
  background: linear-gradient(135deg, transparent 50%, var(--sand) 50%);
}

.page-about .timeline-card h3 {
  margin: 0 0 8px;
  font-size: clamp(16px, 2.2vw, 19px);
  line-height: 1.4;
  color: var(--ink);
}

.page-about .timeline-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .timeline-item:target::before {
  background: var(--mint);
  box-shadow: 0 0 0 4px rgba(37, 224, 174, .22);
}

.page-about .timeline-item:target .timeline-card {
  border-color: var(--mint);
  transform: translateY(-2px);
}

.page-about .timeline-item:target .timeline-year {
  color: var(--brick);
}

/* 团队与观察员 */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.4vw, 34px);
}

.page-about .about-team-text p {
  margin: 0 0 14px;
}

.page-about .team-rings {
  position: relative;
  width: clamp(180px, 46vw, 240px);
  aspect-ratio: 1 / 1;
  margin: clamp(18px, 3vw, 26px) auto clamp(14px, 2.4vw, 20px);
}

.page-about .ring {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  border: 1px solid var(--line-soft);
  display: grid;
  place-items: center;
  transition: border-color .25s var(--ease), background-color .25s var(--ease);
}

.page-about .ring--city {
  width: 100%;
  height: 100%;
  border-color: var(--line-ghost);
  border-style: dashed;
}

.page-about .ring--obs {
  width: 68%;
  height: 68%;
  border-color: rgba(232, 178, 58, .7);
}

.page-about .ring--edit {
  width: 40%;
  height: 40%;
  border-color: var(--mint);
  background: rgba(37, 224, 174, .12);
}

.page-about .ring-tag {
  position: absolute;
  left: 50%;
  top: -8px;
  transform: translateX(-50%);
  white-space: nowrap;
  font-size: 10px;
  letter-spacing: .04em;
  padding: 0 6px;
  background: var(--sand);
  color: var(--muted);
  transition: color .2s var(--ease);
}

.page-about .ring:hover .ring-tag {
  color: var(--ink);
}

.page-about .ring:hover {
  border-color: var(--mint);
}

.page-about .ring-core {
  font-size: clamp(20px, 3.4vw, 26px);
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.02em;
}

.page-about .team-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-about .team-legend li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .legend-dot {
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  margin-top: 5px;
  border-radius: 50%;
  border: 1px solid var(--line-soft);
}

.page-about .legend-dot--edit {
  background: var(--mint);
  border-color: var(--mint);
}

.page-about .legend-dot--obs {
  background: var(--gold);
  border-color: var(--gold);
}

.page-about .legend-dot--city {
  background: transparent;
  border-style: dashed;
}

@media (min-width: 900px) {
  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
  }
}

/* 三条工作方式 */
.page-about .way-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.2vw, 32px);
}

.page-about .way-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .way-card {
  position: relative;
  background: var(--sand-2);
  border: 1px solid var(--line-ghost);
  border-left: 2px solid var(--gold);
  padding: clamp(15px, 2.4vw, 20px) clamp(15px, 2.4vw, 22px);
  transition: transform .25s var(--ease), border-color .25s var(--ease);
}

.page-about .way-card::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 14px;
  height: 14px;
  background: linear-gradient(135deg, transparent 50%, var(--sand) 50%);
}

.page-about .way-card:hover {
  transform: translateY(-2px);
  border-left-color: var(--mint);
}

.page-about .way-num {
  display: block;
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--brick);
  margin-bottom: 8px;
}

.page-about .way-card h3 {
  margin: 0 0 8px;
  font-size: clamp(16px, 2.1vw, 18px);
  line-height: 1.45;
  color: var(--ink);
}

.page-about .way-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--muted);
}

@media (min-width: 880px) {
  .page-about .way-layout {
    grid-template-columns: minmax(0, .58fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* 规模面板 */
.page-about .about-panel {
  position: relative;
  padding: clamp(24px, 4vw, 46px) clamp(20px, 3.4vw, 42px);
  color: var(--sand-2);
  overflow: hidden;
}

.page-about .about-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(rgba(143, 163, 184, .12) 1px, transparent 1px) 0 0 / 100% 46px,
    linear-gradient(90deg, rgba(143, 163, 184, .12) 1px, transparent 1px) 0 0 / 46px 100%;
  pointer-events: none;
}

.page-about .about-panel > * {
  position: relative;
}

.page-about .about-panel-head {
  padding-bottom: 14px;
  margin-bottom: clamp(20px, 3vw, 30px);
  border-bottom: 1px solid rgba(143, 163, 184, .3);
}

.page-about .about-panel-title {
  margin: 0 0 6px;
  color: var(--sand-2);
  max-width: 20ch;
}

.page-about .about-panel-kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--mint-soft);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 28px);
  margin-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-metric-num {
  font-size: clamp(30px, 6vw, 52px);
  line-height: 1;
  font-weight: 700;
  letter-spacing: -.03em;
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

.page-about .about-metric-label {
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(244, 233, 212, .72);
}

.page-about .about-panel-note {
  margin: 0 0 clamp(18px, 3vw, 26px);
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(244, 233, 212, .82);
  max-width: 40em;
  padding-top: 16px;
  border-top: 1px solid rgba(143, 163, 184, .25);
}

.page-about .about-panel-btn {
  display: inline-block;
}

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

/* 专题 */
.page-about .about-topics-lede {
  margin: 0 0 clamp(18px, 3vw, 26px);
  max-width: 40em;
  font-size: 16px;
  line-height: 1.78;
}

.page-about .topic-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .topic-item {
  border-top: 1px solid var(--line-soft);
  padding-top: 14px;
}

.page-about .topic-tag {
  display: inline-block;
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--brick);
  background: rgba(180, 67, 47, .09);
  padding: 2px 8px;
  margin-bottom: 8px;
}

.page-about .topic-item h3 {
  margin: 0 0 6px;
  font-size: 17px;
  color: var(--ink);
  letter-spacing: .02em;
}

.page-about .topic-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-topics-more {
  margin: clamp(18px, 3vw, 26px) 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-topics-more a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--mint);
  padding-bottom: 1px;
}

.page-about .about-topics-more a:hover {
  color: var(--brick);
  border-bottom-color: var(--brick);
}

@media (min-width: 620px) {
  .page-about .topic-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 20px;
  }
}

@media (min-width: 1080px) {
  .page-about .topic-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 结尾链接 */
.page-about .about-section--last {
  border-top: 1px solid var(--line-soft);
  padding-top: clamp(18px, 3vw, 26px);
}

.page-about .about-next-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-link {
  display: inline-block;
  font-size: 13px;
  line-height: 1.4;
  padding: 9px 15px;
  color: var(--ink);
  text-decoration: none;
  background: var(--sand-2);
  border: 1px solid var(--line-soft);
  transition: border-color .2s var(--ease), transform .2s var(--ease), color .2s var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  border-color: var(--mint);
  color: var(--brick);
  transform: translateY(-2px);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-link,
  .page-about .way-card,
  .page-about .timeline-card,
  .page-about .timeline-jump a {
    transition: none;
  }

  .page-about .about-link:hover,
  .page-about .way-card:hover,
  .page-about .timeline-jump a:hover {
    transform: none;
  }
}
<<<END>>>