.page-about {
  --ab-gap: 32px;
  --ab-node: 9px;
}

.page-about .breadcrumb {
  padding-top: 22px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  padding-top: 24px;
}

.page-about .ab-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .ab-rail {
  border-left: 1px solid var(--c-line);
  padding-left: 16px;
}

.page-about .ab-rail-title {
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-slate);
  margin: 0 0 12px;
}

.page-about .ab-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .ab-rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 0;
  white-space: nowrap;
  font-size: 14px;
  color: var(--c-body);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .ab-rail-link .mono {
  font-size: 12px;
  color: var(--c-slate);
  transition: color .2s var(--ease);
}

.page-about .ab-rail-link:hover,
.page-about .ab-rail-link:focus-visible {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

.page-about .ab-rail-link:hover .mono,
.page-about .ab-rail-link:focus-visible .mono {
  color: var(--c-cyan);
}

.page-about .ab-rail-foot {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 18px 0 0;
  font-size: 12px;
  color: var(--c-slate);
}

.page-about .ab-rail-foot .mono {
  font-size: 12px;
}

.page-about .ab-hero-main h1 {
  margin: 14px 0 18px;
  font-size: clamp(30px, 6vw, 52px);
  line-height: 1.12;
  letter-spacing: .01em;
  color: var(--c-white);
  max-width: 17ch;
}

.page-about .ab-hero-main .lead {
  max-width: 58ch;
}

.page-about .ab-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .ab-quickfacts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 36px 0 0;
  padding: 0;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .ab-fact {
  background: var(--c-panel);
  padding: 14px 16px;
}

.page-about .ab-fact dt {
  font-size: 12px;
  color: var(--c-slate);
  margin-bottom: 6px;
}

.page-about .ab-fact dd {
  margin: 0;
  font-size: 22px;
  color: var(--c-cyan);
  letter-spacing: .02em;
}

/* ---------- 时间轴 ---------- */

.page-about .ab-wide-figure {
  margin: 34px 0 0;
}

.page-about .ab-timeline {
  list-style: none;
  margin: 42px 0 0;
  padding: 0 0 0 20px;
  border-left: 1px solid var(--c-line);
}

.page-about .ab-tl-item {
  position: relative;
  padding: 0 0 38px;
}

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

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: calc(-20px - 5px);
  top: 8px;
  width: var(--ab-node);
  height: var(--ab-node);
  border-radius: 50%;
  background: var(--c-space);
  border: 1px solid var(--c-violet);
  transition: background .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .ab-tl-item:hover::before,
.page-about .ab-tl-item:focus-within::before {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  box-shadow: 0 0 0 5px rgba(0, 229, 255, .12);
}

.page-about .ab-tl-year {
  margin: 0 0 6px;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--c-violet);
}

.page-about .ab-tl-body h3 {
  margin: 0 0 8px;
  font-size: 19px;
  line-height: 1.4;
  color: var(--c-white);
}

.page-about .ab-tl-body > p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-body);
  max-width: 64ch;
}

.page-about .ab-tl-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 10px;
  padding: 6px 0 6px 14px;
  border-left: 2px solid var(--c-line);
  transition: border-color .25s var(--ease);
}

.page-about .ab-tl-item:hover .ab-tl-summary,
.page-about .ab-tl-item:focus-within .ab-tl-summary {
  border-left-color: var(--c-cyan);
}

.page-about .ab-tl-summary p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-slate);
  max-width: 56ch;
}

/* ---------- 订阅优先 ---------- */

.page-about .ab-sub-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 30px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .ab-sub-col {
  background: var(--c-panel);
  padding: 26px 20px;
}

.page-about .ab-sub-col h3 {
  margin: 0 0 18px;
  font-size: 17px;
  letter-spacing: .02em;
  color: var(--c-white);
}

.page-about .ab-sub-col-after h3 {
  color: var(--c-cyan);
}

.page-about .ab-problem-list,
.page-about .ab-solve-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 15px;
}

.page-about .ab-problem-list li,
.page-about .ab-solve-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-body);
}

.page-about .ab-problem-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 9px;
  height: 1px;
  background: var(--c-slate);
}

.page-about .ab-solve-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  background: var(--c-cyan);
}

/* ---------- 数据回翻 ---------- */

.page-about .ab-trace-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

.page-about .ab-trace-figure .figure {
  margin: 0;
}

.page-about .ab-trace-body .section-title {
  margin: 12px 0 16px;
}

.page-about .ab-trace-body > p {
  margin: 0;
  max-width: 60ch;
  color: var(--c-body);
  font-size: 15.5px;
  line-height: 1.78;
}

.page-about .ab-trace-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 28px;
}

.page-about .ab-trace-cards .card p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-body);
}

.page-about .ab-trace-cards .card-meta {
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-slate);
  margin: 0 0 8px;
}

/* ---------- 赛事覆盖 ---------- */

.page-about .ab-cov-cats {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 1px;
  margin-top: 30px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .ab-cat {
  background: var(--c-panel);
  padding: 16px 18px;
  transition: background .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .ab-cat strong {
  display: block;
  font-size: 15.5px;
  color: var(--c-white);
  margin-bottom: 6px;
}

.page-about .ab-cat span {
  font-size: 12.5px;
  color: var(--c-slate);
}

.page-about .ab-cat:hover {
  background: #16223E;
  box-shadow: inset 0 0 0 1px var(--c-cyan);
}

.page-about .ab-kpi-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 1px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
  border-top: 0;
}

.page-about .ab-kpi-cell {
  background: var(--c-panel);
  padding: 20px 18px;
}

.page-about .ab-kpi-value {
  margin: 0 0 6px;
  font-size: 26px;
  color: var(--c-white);
  letter-spacing: .02em;
}

.page-about .ab-kpi-label {
  margin: 0;
  font-size: 12.5px;
  color: var(--c-slate);
}

.page-about .ab-cov-note {
  margin: 20px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--c-violet);
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-body);
  max-width: 68ch;
}

/* ---------- 团队与服务 ---------- */

.page-about .ab-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

.page-about .ab-team-body .section-title {
  margin: 12px 0 16px;
}

.page-about .ab-team-body > p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-body);
}

.page-about .ab-team-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 26px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .ab-role {
  background: var(--c-panel);
  padding: 18px 18px 20px;
}

.page-about .ab-role-index {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--c-violet);
}

.page-about .ab-role h3 {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--c-white);
}

.page-about .ab-role p:last-child {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-body);
}

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

/* ---------- 合作生态 ---------- */

.page-about .ab-partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 30px;
}

.page-about .ab-partner-item {
  padding: 22px 20px;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  transition: border-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .ab-partner-item:hover {
  border-color: var(--c-cyan);
  transform: translateY(-3px);
}

.page-about .ab-partner-item h3 {
  margin: 14px 0 10px;
  font-size: 17px;
  color: var(--c-white);
}

.page-about .ab-partner-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-body);
}

.page-about .ab-honor-note {
  margin-top: 28px;
  padding: 20px 22px;
  background: var(--c-carbon);
  border-left: 2px solid var(--c-orange);
}

.page-about .ab-honor-note p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--c-body);
  max-width: 72ch;
}

/* ---------- 下一页入口 ---------- */

.page-about .ab-next {
  border-top: 1px solid var(--c-line);
}

.page-about .ab-next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 26px;
  background: var(--c-line);
  border: 1px solid var(--c-line);
}

.page-about .ab-next-item {
  display: block;
  background: var(--c-panel);
  padding: 22px 20px;
  text-decoration: none;
  transition: background .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .ab-next-item:hover,
.page-about .ab-next-item:focus-visible {
  background: #16223E;
  box-shadow: inset 0 0 0 1px var(--c-cyan);
}

.page-about .ab-next-index {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--c-cyan);
}

.page-about .ab-next-item h3 {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--c-white);
}

.page-about .ab-next-item p:last-child {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-body);
}

.page-about .ab-next-back {
  margin: 22px 0 0;
}

.page-about .ab-back-link {
  display: inline-block;
  font-size: 14px;
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease);
}

.page-about .ab-back-link:hover,
.page-about .ab-back-link:focus-visible {
  border-bottom-color: var(--c-cyan);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .ab-trace-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-kpi-row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-team-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-partner-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about {
    --ab-gap: 56px;
  }

  .page-about .ab-hero-grid {
    grid-template-columns: minmax(180px, 210px) minmax(0, 1fr);
    gap: var(--ab-gap);
    align-items: start;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 104px;
  }

  .page-about .ab-rail-list {
    display: block;
    overflow: visible;
  }

  .page-about .ab-rail-link {
    display: flex;
  }

  .page-about .ab-quickfacts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-sub-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .page-about .ab-sub-col {
    padding: 34px 30px;
  }

  .page-about .ab-trace-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-team-roles {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .ab-next-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .ab-tl-item {
    display: grid;
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 26px;
  }

  .page-about .ab-tl-year {
    text-align: right;
    padding-top: 2px;
  }

  .page-about .ab-tl-item::before {
    left: calc(-28px - 5px);
  }
}

@media (min-width: 1120px) {
  .page-about .ab-team-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
<<<END>>>