.page-about {
  --ab-rail: 176px;
  --ab-soft: #4A5A52;
  color: var(--cream);
}

.page-about .ab-page {
  padding-top: clamp(18px, 3vw, 36px);
  padding-bottom: clamp(48px, 7vw, 88px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px;
  margin-bottom: clamp(24px, 4vw, 46px);
  font-size: 12px;
  letter-spacing: .12em;
}
.page-about .breadcrumbs__item {
  color: var(--graphite);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.page-about .breadcrumbs__item:hover { color: var(--cyan); }
.page-about .breadcrumbs__item[aria-current="page"] { color: var(--mist); }
.page-about .ab-crumb-sep {
  margin-inline: 8px;
  color: var(--graphite);
  opacity: .7;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  padding-bottom: clamp(38px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
}
.page-about .ab-hero__title {
  display: flex;
  flex-direction: column;
  gap: .1em;
  margin: 14px 0 0;
  font-size: clamp(36px, 6.6vw, 84px);
  line-height: 1.03;
  letter-spacing: .01em;
}
.page-about .ab-hero__thin {
  font-weight: 200;
  font-size: .32em;
  letter-spacing: .36em;
  color: var(--cyan);
}
.page-about .ab-hero__bold {
  font-weight: 900;
  color: var(--cream);
  letter-spacing: -.005em;
}
.page-about .ab-hero__lede {
  max-width: 46ch;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: .02em;
}
.page-about .ab-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(20px, 3.4vw, 44px);
  margin-top: clamp(24px, 3.6vw, 40px);
  padding-top: clamp(18px, 2.8vw, 26px);
  border-top: 1px solid var(--line);
}
.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}
.page-about .ab-fact__num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--cyan);
}
.page-about .ab-fact__num--flame { color: var(--flame); }
.page-about .ab-fact__label {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--graphite);
}
.page-about .ab-hero__figure {
  position: relative;
  margin: 0;
  clip-path: polygon(0 4%, 97% 0, 100% 96%, 3% 100%);
}
.page-about .ab-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 5 / 6;
  object-fit: cover;
  filter: saturate(.88) contrast(1.06);
}
.page-about .ab-hero__caption {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--graphite);
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, .84fr);
    align-items: center;
    gap: clamp(34px, 5vw, 76px);
  }
}

/* ---------- 章节索引 + 正文 ---------- */
.page-about .ab-layout {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  margin-top: clamp(38px, 6vw, 72px);
}
.page-about .ab-index {
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}
.page-about .ab-index__label {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .28em;
  color: var(--graphite);
}
.page-about .ab-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .ab-index__item { flex: 0 0 auto; }
.page-about .ab-index__link {
  display: flex;
  align-items: baseline;
  gap: 9px;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  color: var(--graphite);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: var(--cyan-wash);
}
.page-about .ab-index__num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cyan);
}
.page-about .ab-body {
  display: flex;
  flex-direction: column;
  gap: clamp(46px, 7vw, 96px);
  min-width: 0;
}
.page-about .ab-chapter {
  min-width: 0;
  scroll-margin-top: calc(var(--bar-h) + 28px);
}
.page-about .ab-chapter .section__lead {
  max-width: 62ch;
  margin: clamp(14px, 2vw, 20px) 0 0;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: .02em;
}

@media (min-width: 1024px) {
  .page-about .ab-layout {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 68px);
    align-items: start;
  }
  .page-about .ab-index {
    position: sticky;
    top: calc(var(--bar-h) + 32px);
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 0 16px;
    max-height: calc(100vh - 160px);
    overflow-y: auto;
    scrollbar-width: thin;
  }
  .page-about .ab-index__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }
  .page-about .ab-index__item { flex: none; }
  .page-about .ab-index__link {
    padding: 9px 10px 9px 12px;
    white-space: normal;
  }
}

/* ---------- 01 时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
}
.page-about .ab-timeline__item {
  position: relative;
  padding-left: 34px;
  padding-bottom: clamp(24px, 3vw, 36px);
}
.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}
.page-about .ab-timeline__item:last-child { padding-bottom: 0; }
.page-about .ab-timeline__item:last-child::before { display: none; }
.page-about .ab-timeline__item::after {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .ab-timeline__item:hover::after,
.page-about .ab-timeline__item:focus-within::after {
  background: var(--cyan);
  box-shadow: 0 0 0 4px var(--cyan-wash);
}
.page-about .ab-timeline__year {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--cyan);
}
.page-about .ab-timeline__title {
  margin: 0 0 8px;
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 800;
  color: var(--cream);
  letter-spacing: .01em;
}
.page-about .ab-timeline__text {
  max-width: 60ch;
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.8;
  letter-spacing: .02em;
}
.page-about .ab-timeline__note {
  max-height: 0;
  margin: 0;
  overflow: hidden;
  opacity: 0;
  color: var(--graphite);
  font-size: 13px;
  line-height: 1.75;
  transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease), margin-top var(--dur) var(--ease);
}
.page-about .ab-timeline__item:hover .ab-timeline__note,
.page-about .ab-timeline__item:focus-within .ab-timeline__note {
  max-height: 7em;
  margin-top: 8px;
  opacity: 1;
}
@media (hover: none) {
  .page-about .ab-timeline__note {
    max-height: none;
    margin-top: 8px;
    opacity: 1;
  }
}

/* ---------- 02 三支小组 ---------- */
.page-about .ab-teams {
  display: grid;
  gap: 1px;
  margin-top: clamp(28px, 4vw, 46px);
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .ab-team {
  background: var(--ink);
  padding: clamp(22px, 3vw, 32px);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.page-about .ab-team:hover,
.page-about .ab-team:focus-within {
  background: var(--board-lift);
  transform: translateY(-2px);
  box-shadow: inset 0 0 0 1px var(--cyan);
}
.page-about .ab-team__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  margin-bottom: 18px;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--cyan);
}
.page-about .ab-team__title {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 800;
  color: var(--cream);
  letter-spacing: .02em;
}
.page-about .ab-team__desc {
  margin: 0 0 18px;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.8;
  letter-spacing: .02em;
}
.page-about .ab-team__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .ab-team__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--graphite);
}
.page-about .ab-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

@media (min-width: 820px) {
  .page-about .ab-teams { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ---------- 03 四道工序 ---------- */
.page-about .ab-process {
  display: grid;
  gap: clamp(26px, 4vw, 42px);
  margin-top: clamp(28px, 4vw, 46px);
}
.page-about .ab-process__fig {
  margin: 0;
  clip-path: polygon(0 3%, 100% 0, 100% 97%, 0 100%);
}
.page-about .ab-process__fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 9 / 7;
  object-fit: cover;
  filter: saturate(.85) contrast(1.05);
}
.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .ab-step {
  position: relative;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 0 16px;
  padding-bottom: clamp(18px, 2.6vw, 26px);
}
.page-about .ab-step::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 36px;
  bottom: 2px;
  border-left: 1px dashed var(--line);
}
.page-about .ab-step:last-child { padding-bottom: 0; }
.page-about .ab-step:last-child::before { display: none; }
.page-about .ab-step__num {
  grid-row: 1 / span 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 32px;
  position: relative;
  z-index: 1;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--ink);
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--cyan);
}
.page-about .ab-step__title {
  grid-column: 2;
  margin: 4px 0 6px;
  font-size: 17px;
  font-weight: 800;
  color: var(--cream);
  letter-spacing: .02em;
}
.page-about .ab-step__text {
  grid-column: 2;
  margin: 0;
  color: var(--graphite);
  font-size: 14px;
  line-height: 1.78;
  letter-spacing: .02em;
}

@media (min-width: 900px) {
  .page-about .ab-process {
    grid-template-columns: minmax(0, .82fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 04 数据指标（暖白色块） ---------- */
.page-about .ab-chapter--cream {
  background: var(--cream);
  color: var(--char);
  padding: clamp(26px, 4vw, 50px) clamp(20px, 3.4vw, 48px);
  border-radius: 2px;
}
.page-about .ab-chapter--cream .section__idx { color: var(--turf); }
.page-about .ab-chapter--cream .section__title { color: var(--char); }
.page-about .ab-chapter--cream .section__lead { color: var(--ab-soft); }
.page-about .ab-metrics {
  display: grid;
  gap: 1px;
  margin-top: clamp(24px, 3.2vw, 38px);
  background: rgba(20, 58, 44, .16);
  border: 1px solid rgba(20, 58, 44, .16);
}
.page-about .ab-metric {
  background: var(--cream);
  padding: clamp(18px, 2.4vw, 26px);
}
.page-about .ab-metric__name {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--char);
}
.page-about .ab-metric__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.78;
  letter-spacing: .02em;
  color: var(--ab-soft);
}
.page-about .ab-metrics__note {
  margin: clamp(20px, 2.6vw, 28px) 0 0;
  padding-top: 16px;
  border-top: 1px dashed rgba(20, 58, 44, .28);
  font-size: 13px;
  line-height: 1.85;
  letter-spacing: .02em;
  color: var(--ab-soft);
}
.page-about .ab-metrics__note a {
  color: var(--turf);
  text-decoration: none;
  border-bottom: 1px solid var(--turf);
}
.page-about .ab-metrics__note a:hover { color: var(--flame); border-bottom-color: var(--flame); }

@media (min-width: 560px) {
  .page-about .ab-metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1000px) {
  .page-about .ab-metrics { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ---------- 05 档案 ---------- */
.page-about .ab-archive {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  margin-top: clamp(28px, 4vw, 46px);
}
.page-about .ab-archive__card {
  background: var(--board);
  border: 1px solid var(--line);
  padding: clamp(22px, 3vw, 32px);
  transition: border-color var(--dur) var(--ease);
}
.page-about .ab-archive__card:hover { border-color: var(--line-strong); }
.page-about .ab-archive__title {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 800;
  color: var(--cream);
  letter-spacing: .02em;
}
.page-about .ab-archive__desc {
  margin: 0 0 20px;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.8;
  letter-spacing: .02em;
}
.page-about .ab-fields {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .ab-fields__row {
  display: grid;
  gap: 4px 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}
.page-about .ab-fields__k {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
}
.page-about .ab-fields__v {
  font-size: 14px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--mist);
}

@media (min-width: 520px) {
  .page-about .ab-fields__row {
    grid-template-columns: 116px minmax(0, 1fr);
    align-items: baseline;
  }
}
@media (min-width: 860px) {
  .page-about .ab-archive { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- 06 合作 ---------- */
.page-about .ab-partner {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(28px, 4vw, 46px);
}
.page-about .ab-partner__media {
  position: relative;
  margin: 0;
  clip-path: polygon(0 0, 100% 4%, 100% 100%, 0 96%);
}
.page-about .ab-partner__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.9) contrast(1.05);
}
.page-about .ab-partner .exhibit-list { margin: 0; }

@media (min-width: 900px) {
  .page-about .ab-partner {
    grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr);
    align-items: start;
  }
}

/* ---------- 07 赛季阶段 ---------- */
.page-about .ab-phases {
  display: grid;
  gap: 1px;
  margin-top: clamp(28px, 4vw, 46px);
  background: var(--line);
  border: 1px solid var(--line);
}
.page-about .ab-phase {
  background: var(--ink);
  padding: clamp(20px, 2.6vw, 28px);
  transition: background var(--dur) var(--ease);
}
.page-about .ab-phase:hover { background: var(--board-lift); }
.page-about .ab-phase__num {
  display: block;
  margin-bottom: 12px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--flame);
}
.page-about .ab-phase__title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--cream);
  letter-spacing: .02em;
}
.page-about .ab-phase__text {
  margin: 0;
  color: var(--graphite);
  font-size: 13px;
  line-height: 1.78;
  letter-spacing: .02em;
}
.page-about .ab-followup {
  max-width: 64ch;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding-left: 18px;
  border-left: 2px solid var(--cyan);
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
  letter-spacing: .02em;
}
.page-about .ab-followup a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .ab-followup a:hover { color: var(--cream); border-bottom-color: var(--cream); }

@media (min-width: 640px) {
  .page-about .ab-phases { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1000px) {
  .page-about .ab-phases { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ---------- 结尾 CTA ---------- */
.page-about .ab-cta {
  position: relative;
  overflow: hidden;
  margin-top: clamp(46px, 7vw, 96px);
  padding: clamp(28px, 5vw, 56px);
  border: 1px solid var(--line);
  background: linear-gradient(140deg, var(--board) 0%, var(--ink) 62%);
}
.page-about .ab-cta::after {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -58%;
  width: 380px;
  height: 380px;
  background: radial-gradient(closest-side, var(--cyan-wash), transparent);
  pointer-events: none;
}
.page-about .ab-cta__title {
  position: relative;
  margin: 0 0 12px;
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 900;
  letter-spacing: .01em;
  color: var(--cream);
}
.page-about .ab-cta__text {
  position: relative;
  max-width: 58ch;
  margin: 0 0 clamp(20px, 3vw, 32px);
  color: var(--mist);
  font-size: 15px;
  line-height: 1.85;
  letter-spacing: .02em;
}
.page-about .ab-cta__actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
<<<END>>>