.page-about {
  --ab-ink-soft: #2c352c;
  --ab-line-light: rgba(246, 244, 238, .26);
  background: var(--paper);
  color: var(--ink);
  padding-top: clamp(72px, 12vw, 112px);
  padding-bottom: clamp(48px, 8vw, 120px);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--grass-mid);
  margin-bottom: clamp(20px, 4vw, 36px);
}
.page-about .ab-crumbs a {
  color: inherit;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}
.page-about .ab-crumbs a:hover {
  color: var(--ink);
  border-bottom-color: var(--whistle);
}
.page-about .ab-crumbs [aria-current="page"] {
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  background: var(--night);
  color: var(--paper);
  border-top: var(--bd) solid var(--ink);
  border-bottom: var(--bd) solid var(--ink);
  padding-block: clamp(36px, 6vw, 72px) clamp(44px, 7vw, 88px);
}

.page-about .ab-hero__inner {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: center;
}

.page-about .ab-hero .eyebrow {
  color: var(--whistle);
  margin-bottom: 14px;
}

.page-about .ab-hero h1 {
  font-family: var(--font-sans);
  font-weight: 800;
  letter-spacing: -.02em;
  font-size: clamp(30px, 5.4vw, 56px);
  line-height: 1.18;
  margin: 0 0 20px;
  text-wrap: balance;
}

.page-about .ab-hero__lede {
  color: rgba(246, 244, 238, .84);
  font-size: 17px;
  line-height: 1.78;
  max-width: 58ch;
  margin: 0 0 28px;
}

.page-about .ab-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  border: var(--bd) solid var(--ab-line-light);
  background: var(--ab-line-light);
}
.page-about .ab-figures__item {
  background: var(--night);
  padding: 14px 14px 16px;
}
.page-about .ab-figures dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--index);
  margin-bottom: 8px;
}
.page-about .ab-figures dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}
.page-about .ab-figures .num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1;
  color: var(--whistle);
  font-variant-numeric: tabular-nums;
}
.page-about .ab-figures__unit {
  font-size: 12px;
  color: var(--index);
}

.page-about .ab-hero__visual {
  position: relative;
  width: 100%;
  max-width: 380px;
  margin-inline: auto;
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
}
.page-about .ab-dial {
  width: 100%;
  height: auto;
  display: block;
}
.page-about .ab-dial__ring {
  fill: none;
  stroke: rgba(246, 244, 238, .18);
  stroke-width: 3;
}
.page-about .ab-dial__ticks {
  fill: none;
  stroke: var(--whistle);
  stroke-width: 12;
  stroke-dasharray: 20 98.48;
}
.page-about .ab-dial__center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -58%);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(52px, 12vw, 92px);
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--paper);
  font-variant-numeric: tabular-nums;
}
.page-about .ab-dial__cap {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, 34px);
  font-size: 11px;
  letter-spacing: .3em;
  color: var(--index);
}

/* ---------- 通用标题 ---------- */
.page-about .ab-h2 {
  font-family: var(--font-sans);
  font-weight: 800;
  letter-spacing: -.02em;
  font-size: clamp(26px, 4.2vw, 46px);
  line-height: 1.16;
  margin: 0 0 16px;
  text-wrap: balance;
}
.page-about .ab-lede {
  max-width: 62ch;
  font-size: 17px;
  line-height: 1.78;
  color: var(--ab-ink-soft);
  margin: 0 0 clamp(22px, 4vw, 36px);
}

/* ---------- A 区 赛季走廊 ---------- */
.page-about .ab-corridor__banner {
  margin: 0 0 clamp(26px, 4vw, 42px);
}
.page-about .ab-corridor__banner .figure__frame {
  border: var(--bd) solid var(--ink);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .ab-rail {
  position: relative;
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 20px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 44px, #000 calc(100% - 44px), transparent 100%);
  mask-image: linear-gradient(90deg, transparent 0, #000 44px, #000 calc(100% - 44px), transparent 100%);
}
.page-about .ab-rail__track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(232px, 76vw);
  gap: clamp(14px, 3vw, 24px);
  list-style: none;
  margin: 0;
  padding: 6px 46px 6px 0;
}
.page-about .ab-rail__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--paper);
  border: var(--bd) solid var(--ink);
  box-shadow: var(--shadow-mid);
  padding: clamp(16px, 3vw, 24px);
  transition: transform 160ms var(--ease), box-shadow 160ms var(--ease);
}
.page-about .ab-rail__item:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}
.page-about .ab-rail__no {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 5vw, 42px);
  line-height: 1;
  color: var(--grass-deep);
  font-variant-numeric: tabular-nums;
  margin: 0;
}
.page-about .ab-rail__title {
  font-size: 17px;
  font-weight: 800;
  margin: 0;
}
.page-about .ab-rail__desc {
  font-size: 15px;
  line-height: 1.72;
  color: var(--ab-ink-soft);
  margin: 0;
  flex: 1;
}
.page-about .ab-rail__tag {
  align-self: flex-start;
}
.page-about .ab-rail__item--now {
  background: var(--whistle);
}
.page-about .ab-rail__item--now .ab-rail__no {
  color: var(--ink);
}
.page-about .ab-rail__item--now .ab-rail__desc {
  color: rgba(10, 12, 10, .82);
}
.page-about .ab-rail__hint {
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--grass-mid);
}

/* ---------- B 区 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(12px, 2vw, 20px);
}
.page-about .ab-role {
  background: var(--paper);
  border: var(--bd) solid var(--ink);
  box-shadow: var(--shadow-mid);
  transition: transform 160ms var(--ease), box-shadow 160ms var(--ease);
}
.page-about .ab-role:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}
.page-about .ab-role__sum {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}
.page-about .ab-role__sum::-webkit-details-marker {
  display: none;
}
.page-about .ab-role__no {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--grass-mid);
}
.page-about .ab-role__name {
  font-size: 18px;
  font-weight: 800;
}
.page-about .ab-role__figure {
  display: inline-flex;
  align-items: baseline;
  gap: 3px;
}
.page-about .ab-role__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 28px;
  line-height: 1;
  color: var(--whistle);
  font-variant-numeric: tabular-nums;
}
.page-about .ab-role__unit {
  font-size: 12px;
  color: var(--grass-mid);
}
.page-about .ab-role[open] {
  background: #fffdf8;
}
.page-about .ab-role__body {
  padding: 14px 18px 18px;
  border-top: 3px solid var(--ink);
  font-size: 15px;
  line-height: 1.76;
  color: var(--ab-ink-soft);
}
.page-about .ab-role__body p {
  margin: 0 0 10px;
}
.page-about .ab-role__body p:last-child {
  margin-bottom: 0;
}
.page-about .ab-role__body a {
  color: var(--grass-deep);
  font-weight: 700;
}

/* ---------- C 区 数据链路 ---------- */
.page-about .ab-pipe {
  position: relative;
}
.page-about .ab-pipe__circuit {
  position: absolute;
  top: clamp(6px, 2vw, 20px);
  right: 0;
  width: clamp(110px, 20vw, 220px);
  height: auto;
  color: var(--grass-mid);
  opacity: .28;
  pointer-events: none;
}
.page-about .ab-flow {
  margin-top: clamp(10px, 2vw, 16px);
}
.page-about .ab-flow__nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.page-about .ab-flow__nodes > li {
  min-width: 0;
}
.page-about .ab-step {
  background: var(--grass-deep);
  color: var(--paper);
  border: var(--bd) solid var(--ink);
  box-shadow: var(--shadow-mid);
  transition: transform 160ms var(--ease), box-shadow 160ms var(--ease);
}
.page-about .ab-step:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-hard);
}
.page-about .ab-step__sum {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-weight: 800;
  font-size: 16px;
}
.page-about .ab-step__sum::-webkit-details-marker {
  display: none;
}
.page-about .ab-step__sum::before {
  content: "";
  flex: none;
  width: 14px;
  height: 14px;
  background: var(--whistle);
  border: 3px solid var(--paper);
  transition: background 160ms var(--ease);
}
.page-about .ab-step[open] .ab-step__sum::before {
  background: var(--mint);
}
.page-about .ab-step__no {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--mint);
}
.page-about .ab-step__body {
  padding: 0 16px 16px 45px;
  font-size: 15px;
  line-height: 1.76;
  color: rgba(246, 244, 238, .86);
}
.page-about .ab-step__body p {
  margin: 0;
}

.page-about .ab-pipe__times {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(14px, 2.5vw, 22px);
  margin-top: clamp(26px, 4vw, 44px);
}
.page-about .ab-time {
  border: var(--bd) solid var(--ink);
  box-shadow: var(--shadow-hard);
  padding: clamp(18px, 3vw, 28px);
}
.page-about .ab-time--grass {
  background: var(--grass-mid);
  color: var(--paper);
}
.page-about .ab-time--paper {
  background: var(--paper);
  color: var(--ink);
}
.page-about .ab-time__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(48px, 9vw, 82px);
  line-height: 1;
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
  margin: 0;
}
.page-about .ab-time--grass .ab-time__num {
  color: var(--mint);
}
.page-about .ab-time--paper .ab-time__num {
  color: var(--score-red);
}
.page-about .ab-time__unit {
  font-size: 12px;
  letter-spacing: .16em;
  margin: 6px 0 0;
  opacity: .82;
}
.page-about .ab-time__note {
  font-size: 15px;
  line-height: 1.72;
  margin: 10px 0 0;
  opacity: .9;
}

.page-about .ab-pipe__figure {
  margin: clamp(28px, 5vw, 48px) 0 0;
  max-width: 860px;
}
.page-about .ab-pipe__figure .figure__frame {
  border: var(--bd) solid var(--ink);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}
.page-about .ab-pipe__link {
  margin: clamp(18px, 3vw, 28px) 0 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--ab-ink-soft);
}
.page-about .ab-pipe__link a {
  color: var(--grass-deep);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-thickness: 3px;
  text-underline-offset: 4px;
}
.page-about .ab-pipe__link a:hover {
  color: var(--whistle);
}

/* ---------- D 区 名单矩阵 ---------- */
.page-about .ab-matrix-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(4px, 1vw, 10px);
}
.page-about .ab-matrix {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
}
.page-about .ab-matrix__cell {
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
  border: 2px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}
.page-about .ab-matrix__cell--gk {
  background: var(--card);
}
.page-about .ab-matrix__cell--df {
  background: var(--mint);
}
.page-about .ab-matrix__cell--mf {
  background: var(--whistle);
}
.page-about .ab-matrix__cell--fw {
  background: var(--score-red);
  color: var(--paper);
}
.page-about .ab-matrix__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  align-content: start;
  font-size: 14px;
  line-height: 1.6;
}
.page-about .ab-matrix__legend li {
  display: flex;
  align-items: center;
  gap: 10px;
}
.page-about .ab-matrix__dot {
  flex: none;
  width: 16px;
  height: 16px;
  border: 2px solid var(--ink);
}
.page-about .ab-matrix__dot--gk {
  background: var(--card);
}
.page-about .ab-matrix__dot--df {
  background: var(--mint);
}
.page-about .ab-matrix__dot--mf {
  background: var(--whistle);
}
.page-about .ab-matrix__dot--fw {
  background: var(--score-red);
}

.page-about .ab-notes {
  margin-top: clamp(26px, 4vw, 42px);
}
.page-about .ab-note {
  background: var(--paper);
  border: var(--bd) solid var(--ink);
  box-shadow: var(--shadow-mid);
  padding: clamp(18px, 3vw, 26px);
}
.page-about .ab-note h3 {
  font-size: 17px;
  font-weight: 800;
  margin: 0 0 10px;
}
.page-about .ab-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--ab-ink-soft);
}
.page-about .ab-note a {
  color: var(--grass-deep);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-thickness: 3px;
  text-underline-offset: 4px;
}
.page-about .ab-note a:hover {
  color: var(--whistle);
}

/* ---------- E 区 合作 ---------- */
.page-about .ab-partner__visual {
  margin: 0 0 clamp(24px, 4vw, 40px);
}
.page-about .ab-partner__visual .figure__frame {
  border: var(--bd) solid var(--ink);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}
.page-about .ab-coops {
  align-items: stretch;
}
.page-about .ab-coop {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--paper);
  border: var(--bd) solid var(--ink);
  box-shadow: var(--shadow-hard);
  padding: clamp(18px, 3vw, 28px);
}
.page-about .ab-coop--dark {
  background: var(--grass-deep);
  color: var(--paper);
}
.page-about .ab-coop__no {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--whistle);
  margin: 0;
}
.page-about .ab-coop--dark .ab-coop__no {
  color: var(--mint);
}
.page-about .ab-coop h3 {
  font-size: 18px;
  font-weight: 800;
  line-height: 1.42;
  margin: 0;
}
.page-about .ab-coop p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
}
.page-about .ab-partner__link {
  margin: clamp(22px, 3vw, 32px) 0 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--ab-ink-soft);
}
.page-about .ab-partner__link a {
  color: var(--grass-deep);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-thickness: 3px;
  text-underline-offset: 4px;
}
.page-about .ab-partner__link a:hover {
  color: var(--whistle);
}

/* ---------- F 区 服务 ---------- */
.page-about .ab-service__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 4vw, 40px);
  margin-top: clamp(4px, 1vw, 10px);
}
.page-about .ab-service__main .lede {
  margin-bottom: 16px;
}
.page-about .ab-service__btn {
  margin-top: 8px;
}
.page-about .ab-service__list {
  margin: 0;
  background: var(--night);
  color: var(--paper);
  border: var(--bd) solid var(--ink);
  box-shadow: var(--shadow-hard);
  padding: clamp(18px, 3vw, 28px);
}
.page-about .ab-service__list dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--whistle);
  margin-top: 16px;
}
.page-about .ab-service__list dt:first-child {
  margin-top: 0;
}
.page-about .ab-service__list dd {
  margin: 6px 0 0;
  font-size: 16px;
  line-height: 1.7;
  color: rgba(246, 244, 238, .9);
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .ab-matrix {
    grid-template-columns: repeat(8, minmax(0, 1fr));
  }
}

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

@media (min-width: 720px) {
  .page-about .ab-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .ab-rail__track {
    grid-auto-columns: minmax(258px, 320px);
  }
}

@media (min-width: 860px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: clamp(40px, 6vw, 88px);
  }
  .page-about .ab-flow__nodes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(28px, 5vw, 60px);
  }
  .page-about .ab-flow__nodes > li {
    position: relative;
  }
  .page-about .ab-flow__nodes > li + li::before {
    content: "";
    position: absolute;
    top: 21px;
    left: calc(-1 * clamp(28px, 5vw, 60px));
    width: clamp(28px, 5vw, 60px);
    height: 0;
    border-top: 3px dashed var(--mint);
  }
  .page-about .ab-matrix-wrap {
    grid-template-columns: minmax(0, 1fr) minmax(0, 220px);
    align-items: start;
  }
  .page-about .ab-service__body {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-matrix {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail__item,
  .page-about .ab-role,
  .page-about .ab-step {
    transition: none;
  }
  .page-about .ab-rail__item:hover,
  .page-about .ab-role:hover,
  .page-about .ab-step:hover {
    transform: none;
  }
}