.page-about {
  display: block;
  background: var(--ink);
  overflow-x: hidden;
  overflow-x: clip;
}

.page-about .section {
  padding: 52px 0;
}

.page-about .section--panel {
  background: var(--panel-3);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}

.page-about .section--deep {
  background: var(--panel-2);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
}

/* ---------- 页头 ---------- */

.page-about .page-head {
  position: relative;
  padding-top: calc(var(--header-h) + 28px);
  padding-bottom: 20px;
}

.page-about .page-head::before {
  content: "";
  position: absolute;
  top: calc(var(--header-h) - 20px);
  right: -80px;
  width: 280px;
  height: 280px;
  background: radial-gradient(circle, rgba(108, 70, 168, .5), rgba(108, 70, 168, 0) 68%);
  pointer-events: none;
  z-index: 0;
}

.page-about .page-head > * {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumbs a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

.page-about h1 {
  margin: 0 0 18px;
  font-size: clamp(30px, 8.4vw, 60px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.02em;
  max-width: 18ch;
}

.page-about .page-head .lead {
  margin: 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-sm);
}

.page-about .about-facts li {
  background: var(--panel);
  padding: 16px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .about-facts__label {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
}

/* ---------- 章节抬头 ---------- */

.page-about .section-head {
  margin-bottom: 30px;
}

.page-about .section-head__index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--amber);
  border: 2px solid var(--line);
  padding: 3px 8px;
  margin-bottom: 12px;
}

.page-about .section-head__title {
  margin: 0 0 10px;
  font-size: clamp(23px, 5.6vw, 36px);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -.015em;
}

.page-about .section-head__note {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 年份档案板 ---------- */

.page-about .timeline {
  position: relative;
  padding-left: 28px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 12px;
  bottom: 30px;
  width: 2px;
  background: linear-gradient(180deg, var(--neon), var(--violet) 62%, rgba(108, 70, 168, 0));
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 18px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 8px;
  width: 12px;
  height: 12px;
  background: var(--amber);
  border: 2px solid var(--ink);
  z-index: 1;
}

.page-about .tl-year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--amber);
}

.page-about .tl-card {
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  padding: 18px 18px 20px;
  transition: transform .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .tl-card:hover,
.page-about .tl-card:focus-within {
  transform: translate(-2px, -4px);
  border-color: var(--neon);
  box-shadow: var(--shadow-neon);
}

.page-about .tl-card__title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.25;
}

.page-about .tl-card__text {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .tl-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .tl-list li {
  position: relative;
  padding-left: 18px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--text);
}

.page-about .tl-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 2px;
  background: var(--neon);
  transition: width .2s var(--ease);
}

.page-about .tl-card:hover .tl-list li::before,
.page-about .tl-card:focus-within .tl-list li::before {
  width: 12px;
}

/* ---------- 分段切换 ---------- */

.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.page-about .tabs__tab {
  appearance: none;
  font-family: var(--font-cn);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .01em;
  padding: 10px 14px;
  background: var(--panel);
  color: var(--muted);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .tabs__tab:hover {
  color: var(--text);
  border-color: var(--neon);
}

.page-about .tabs__tab[aria-selected="true"] {
  background: var(--neon);
  color: var(--ink);
  border-color: var(--neon);
  box-shadow: var(--shadow-sm);
}

.page-about .tabs__tab:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

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

.page-about .role-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .role-card {
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  padding: 18px;
  transition: transform .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .role-card:hover,
.page-about .role-card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--neon);
  box-shadow: var(--shadow-neon);
  outline: none;
}

.page-about .role-card:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.page-about .role-card__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .role-card__head {
  margin: 8px 0 6px;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.25;
}

.page-about .role-card__count {
  display: inline-block;
  margin: 0 0 12px;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--neon);
  border: 1px solid var(--line);
}

.page-about .role-card__duties {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 流程 ---------- */

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

.page-about .flow-texture {
  margin: 26px 0 0;
  box-shadow: none;
  opacity: .72;
}

.page-about .media-frame {
  position: relative;
  padding: 0;
  margin: 0;
  border: 2px solid var(--line);
  background: var(--panel-3);
  box-shadow: var(--shadow);
}

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

.page-about .media-frame__caption {
  display: block;
  padding: 10px 14px;
  border-top: 2px solid var(--line);
  background: var(--panel);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .flow__step {
  position: relative;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  padding: 18px;
}

.page-about .flow__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border: 2px solid var(--amber);
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--amber);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  font-weight: 600;
}

.page-about .flow__step-title {
  margin: 14px 0 8px;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.25;
}

.page-about .flow__step-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .side-note {
  margin-top: 26px;
  border-left: 4px solid var(--neon);
  background: var(--panel);
  border-top: 2px solid var(--line);
  border-right: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  padding: 18px;
}

.page-about .side-note__title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .side-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .side-note a,
.page-about .local-link a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
}

.page-about .side-note a:hover,
.page-about .local-link a:hover,
.page-about .side-note a:focus-visible,
.page-about .local-link a:focus-visible {
  border-bottom-color: var(--amber);
  color: var(--amber);
}

/* ---------- 本地小组 ---------- */

.page-about .local-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .local-figure {
  margin: 0;
}

.page-about .local-body h3 {
  margin: 0 0 12px;
  font-size: 21px;
  font-weight: 800;
  line-height: 1.25;
}

.page-about .local-body p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .local-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  border-top: 2px solid var(--line);
}

.page-about .local-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 12px 0;
  border-bottom: 2px solid var(--line);
}

.page-about .local-list__k {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 20px;
  font-weight: 600;
  color: var(--amber);
  min-width: 76px;
}

.page-about .local-list__v {
  font-size: 14px;
  color: var(--text);
}

.page-about .local-link {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

/* ---------- 合作 ---------- */

.page-about .coop-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .coop-card {
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  padding: 20px 18px 22px;
}

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

.page-about .coop-card__num {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 40px;
  font-weight: 600;
  line-height: 1;
  color: var(--neon);
  letter-spacing: -.02em;
}

.page-about .coop-card__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  line-height: 1.25;
}

.page-about .coop-card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .coop-card--wide {
  background: var(--panel-2);
  border-color: var(--neon);
}

.page-about .coop-card--wide .coop-card__num {
  color: var(--amber);
}

/* ---------- CTA ---------- */

.page-about .cta-block {
  margin-top: 36px;
  padding: 26px 20px 28px;
  border: 2px solid var(--amber);
  background: linear-gradient(140deg, rgba(47, 227, 168, .1), rgba(108, 70, 168, .22));
  box-shadow: var(--shadow);
}

.page-about .cta-block__title {
  margin: 0 0 10px;
  font-size: clamp(22px, 5.4vw, 30px);
  font-weight: 900;
  letter-spacing: -.015em;
  line-height: 1.16;
}

.page-about .cta-block__text {
  margin: 0 0 20px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .cta-block__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 平板 ---------- */

@media (min-width: 700px) {
  .page-about .section {
    padding: 72px 0;
  }

  .page-about .page-head {
    padding-top: calc(var(--header-h) + 44px);
  }

  .page-about .about-facts {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-facts__num {
    font-size: 30px;
  }

  .page-about .role-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .coop-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .coop-card--wide {
    grid-column: 1 / -1;
  }

  .page-about .timeline {
    padding-left: 36px;
  }

  .page-about .timeline::before {
    left: 13px;
  }

  .page-about .tl-item::before {
    left: -32px;
    width: 14px;
    height: 14px;
  }

  .page-about .tl-item {
    padding-bottom: 24px;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 900px) {
  .page-about .section {
    padding: 88px 0;
  }

  .page-about .section-head {
    max-width: 66%;
    margin-bottom: 40px;
  }

  .page-about .local-grid {
    grid-template-columns: 1.02fr 1fr;
    align-items: center;
    gap: 44px;
  }

  .page-about .flow {
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    border: 2px solid var(--line);
    background: var(--panel-3);
    box-shadow: var(--shadow);
  }

  .page-about .flow__step {
    border: 0;
    border-left: 2px solid var(--line);
    background: transparent;
    box-shadow: none;
    padding: 26px 22px 30px;
  }

  .page-about .flow__step:first-child {
    border-left: 0;
  }

  .page-about .flow__step::after {
    content: "";
    position: absolute;
    left: -9px;
    top: 44px;
    width: 14px;
    height: 14px;
    background: var(--amber);
    transform: rotate(45deg);
    border: 2px solid var(--panel-3);
  }

  .page-about .flow__step:first-child::after {
    display: none;
  }

  .page-about .flow-texture {
    margin-top: 34px;
  }

  .page-about .side-note {
    margin-top: 34px;
    padding: 22px 24px;
  }

  .page-about .cta-block {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    align-items: center;
    gap: 8px 36px;
    padding: 34px 32px;
  }

  .page-about .cta-block__title {
    margin-bottom: 0;
  }

  .page-about .cta-block__text {
    grid-column: 1;
    margin-bottom: 0;
  }

  .page-about .cta-block__actions {
    grid-column: 2;
    grid-row: 1 / span 2;
    justify-content: flex-end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .role-card,
  .page-about .tl-list li::before,
  .page-about .breadcrumbs a {
    transition: none;
  }

  .page-about .tl-card:hover,
  .page-about .tl-card:focus-within,
  .page-about .role-card:hover,
  .page-about .role-card:focus-visible {
    transform: none;
  }
}
<<<END>>>