.page-about {
  --ab-line-soft: rgba(168, 179, 174, 0.28);
  --ab-shadow-none: none;
  background: var(--ink);
  color: var(--text-on-dark);
  overflow-x: hidden;
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about .ab-crumb {
  padding-top: 22px;
  padding-bottom: 6px;
}

.page-about .ab-crumb .z9-breadcrumb__list {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--grey);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-top: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(36px, 6vw, 72px);
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 128px);
  background-position: 0 0;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: clamp(90px, 18vw, 220px);
  height: 1px;
  background: var(--lime);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  align-items: end;
}

.page-about .ab-hero__title {
  margin: 14px 0 18px;
  font-family: var(--font-sans);
  font-size: clamp(34px, 7.6vw, 64px);
  font-weight: 900;
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--text-on-dark);
}

.page-about .ab-hero__lede {
  margin: 0 0 18px;
  max-width: 34em;
  font-size: var(--fs-4);
  line-height: 1.72;
  color: var(--lime-soft);
}

.page-about .ab-body {
  margin: 0 0 14px;
  max-width: 66ch;
  font-size: var(--fs-3);
  line-height: 1.78;
  color: var(--text-on-dark);
}

.page-about .ab-hero__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .ab-hero__figure .z9-figure__media {
  overflow: hidden;
}

.page-about .ab-hero__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85);
}

.page-about .ab-hero__figure .z9-figure__cap {
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.1em;
  color: var(--grey);
  border-top: 1px solid var(--line);
}

.page-about .ab-coord {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-coord .z9-coord__item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px 20px;
  background: var(--ink);
}

.page-about .z9-coord__key {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--grey);
}

.page-about .z9-coord__val {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 30px);
  line-height: 1.1;
  color: var(--lime);
}

/* ---------- 编辑主张 ---------- */
.page-about .ab-claim {
  color: var(--text-dark);
}

.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 48px);
}

.page-about .z9-section--cream .ab-h2,
.page-about .z9-section--cream .ab-h3 {
  color: var(--text-dark);
}

.page-about .ab-h2 {
  margin: 12px 0 0;
  font-family: var(--font-sans);
  font-size: clamp(26px, 4.2vw, 38px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.012em;
}

.page-about .ab-h3 {
  margin: 0 0 12px;
  font-family: var(--font-sans);
  font-size: var(--fs-5);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-about .z9-section--cream .ab-body {
  color: var(--text-dark);
}

.page-about .z9-section--cream .z9-eyebrow {
  color: #4A5A50;
}

.page-about .ab-quote {
  margin: 22px 0 0;
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--orange);
  font-size: var(--fs-5);
  line-height: 1.5;
  font-weight: 700;
  color: var(--text-dark);
  max-width: 30em;
}

/* ---------- 发展历程 ---------- */
.page-about .ab-head {
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .ab-sub {
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: var(--fs-3);
  line-height: 1.7;
  color: var(--grey);
}

.page-about .ab-track__tabs {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 34px);
}

.page-about .ab-track__list {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding: 0 0 10px;
  border: 0;
  scrollbar-width: thin;
}

.page-about .ab-node {
  position: relative;
  flex: 0 0 auto;
  min-width: 176px;
  display: grid;
  gap: 4px;
  padding: 14px 16px 14px 26px;
  text-align: left;
  background: var(--ink-3);
  border: 1px solid var(--line);
  color: var(--text-on-dark);
  cursor: pointer;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 20px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid var(--grey);
  transition: background 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .ab-node__idx {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.14em;
  color: var(--grey);
}

.page-about .ab-node__label {
  font-size: var(--fs-4);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .ab-node__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--grey);
}

.page-about .ab-node[aria-selected="true"] {
  border-color: var(--lime);
  color: var(--lime);
}

.page-about .ab-node[aria-selected="true"]::before {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .ab-node:hover {
  border-color: var(--lime-soft);
}

.page-about .ab-track__panel {
  padding: clamp(18px, 3vw, 30px);
  background: var(--ink);
  border: 1px solid var(--line);
  border-top: 3px solid var(--lime);
}

.page-about .ab-track__panel .ab-body {
  color: var(--text-on-dark);
}

.page-about .ab-track__coords {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
}

.page-about .ab-track__coords .z9-coord__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--ink-2);
}

.page-about .ab-track__coords .z9-coord__val {
  font-size: var(--fs-4);
  color: var(--lime-soft);
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
}

.page-about .ab-roster {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .ab-roster__row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 14px;
  align-items: baseline;
}

.page-about .ab-roster__name {
  font-size: var(--fs-3);
  font-weight: 700;
  color: var(--text-dark);
}

.page-about .ab-roster__num {
  font-family: var(--font-mono);
  font-size: var(--fs-4);
  color: var(--text-dark);
}

.page-about .ab-roster__track {
  grid-column: 1 / -1;
  display: block;
  height: 6px;
  background: rgba(26, 33, 29, 0.12);
}

.page-about .ab-roster__bar {
  display: block;
  height: 100%;
  background: var(--ink);
  transition: width 240ms var(--ease);
}

.page-about .ab-roster__bar--a { width: 29%; background: var(--ink); }
.page-about .ab-roster__bar--b { width: 23%; background: var(--ink-2); }
.page-about .ab-roster__bar--c { width: 19%; background: #4A5A50; }
.page-about .ab-roster__bar--d { width: 29%; background: var(--orange); }

.page-about .ab-roster__note {
  margin: 20px 0 0;
  max-width: 42ch;
  font-size: var(--fs-2);
  line-height: 1.8;
  color: #45524A;
}

.page-about .ab-team__figure {
  margin: 26px 0 0;
  border: 1px solid rgba(26, 33, 29, 0.18);
  background: var(--ink);
}

.page-about .ab-team__figure .z9-figure__media {
  overflow: hidden;
}

.page-about .ab-team__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-team__figure .z9-figure__cap {
  padding: 11px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--grey);
  border-top: 1px solid var(--line);
  background: var(--ink);
}

.page-about .ab-flow {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: rgba(26, 33, 29, 0.16);
  border-top: 1px solid rgba(26, 33, 29, 0.16);
  border-bottom: 1px solid rgba(26, 33, 29, 0.16);
}

.page-about .ab-flow__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 14px 4px 14px 14px;
  background: var(--cream);
}

.page-about .ab-flow__num {
  font-family: var(--font-mono);
  font-size: var(--fs-2);
  color: var(--orange);
  letter-spacing: 0.06em;
}

.page-about .ab-flow__text {
  font-size: var(--fs-3);
  line-height: 1.65;
  color: var(--text-dark);
}

.page-about .ab-team__tail {
  margin-top: 22px;
}

.page-about .ab-inline-link {
  color: inherit;
  text-decoration: none;
  border-bottom: 2px solid var(--orange);
  font-weight: 700;
}

.page-about .ab-inline-link:hover,
.page-about .ab-inline-link:focus-visible {
  color: var(--orange);
}

/* ---------- 赛区版图 ---------- */
.page-about .ab-map__band {
  position: relative;
  margin: clamp(6px, 1.5vw, 18px) 0 clamp(26px, 4vw, 46px);
  min-height: clamp(240px, 34vw, 380px);
  overflow: hidden;
  background: var(--ink-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-map__texture {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
  filter: grayscale(0.6);
}

.page-about .ab-map__band-inner {
  position: relative;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 14px;
  padding-top: clamp(18px, 3vw, 32px);
  padding-bottom: clamp(18px, 3vw, 32px);
}

.page-about .ab-map__svg {
  width: 100%;
  max-width: 720px;
  height: auto;
  align-self: center;
}

.page-about .ab-map__lines path {
  stroke: var(--line);
  stroke-width: 1;
  fill: none;
}

.page-about .ab-map__dot {
  fill: var(--grey);
  opacity: 0.7;
}

.page-about .ab-map__dot--key {
  fill: var(--lime);
  opacity: 1;
}

.page-about .ab-map__labels text {
  fill: var(--lime-soft);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.page-about .ab-map__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--grey);
}

.page-about .ab-map__legend .z9-legend__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .ab-stops {
  display: grid;
  gap: 16px;
}

.page-about .ab-stops__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  border: 0;
  scrollbar-width: thin;
}

.page-about .ab-stops__btn {
  flex: 0 0 auto;
  padding: 9px 18px;
  font-size: var(--fs-2);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--grey);
  background: transparent;
  border: 1px solid var(--line);
  cursor: pointer;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .ab-stops__btn[aria-selected="true"] {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .ab-stops__btn:hover {
  border-color: var(--lime-soft);
}

.page-about .ab-stops__panel {
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-stops__panel .ab-body {
  max-width: 62ch;
  color: var(--text-on-dark);
}

.page-about .ab-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(28px, 4vw, 44px);
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-partners__item {
  display: grid;
  gap: 8px;
  padding: 20px;
  background: var(--ink-3);
}

.page-about .ab-partners__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1;
  color: var(--orange);
}

.page-about .ab-partners__label {
  font-size: var(--fs-2);
  line-height: 1.7;
  color: var(--grey);
}

.page-about .ab-partners__note {
  margin-top: 24px;
  color: var(--text-on-dark);
}

/* ---------- 收尾 ---------- */
.page-about .ab-end {
  color: var(--text-dark);
}

.page-about .ab-end__inner {
  border-top: 3px solid var(--ink);
  padding-top: clamp(22px, 3.5vw, 36px);
}

.page-about .ab-end__line {
  margin: 0 0 16px;
  max-width: 20em;
  font-family: var(--font-sans);
  font-size: clamp(28px, 5.4vw, 52px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text-dark);
}

.page-about .ab-end__text {
  margin: 0 0 26px;
  max-width: 56ch;
  font-size: var(--fs-4);
  line-height: 1.72;
  color: #3B4740;
}

.page-about .ab-end__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-end__actions .z9-btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .ab-coord {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 860px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

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

  .page-about .ab-split__aside {
    position: sticky;
    top: calc(var(--topbar-h) + 24px);
    padding-right: 12px;
    border-right: 1px solid var(--ab-line-soft);
  }

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

  .page-about .ab-track__list {
    flex-direction: column;
    overflow: visible;
    padding: 0;
    border-left: 1px solid var(--line);
    padding-left: 14px;
  }

  .page-about .ab-node {
    min-width: 0;
    width: 100%;
    background: transparent;
    border: 0;
    border-bottom: 1px solid var(--line);
    padding: 16px 12px 16px 20px;
  }

  .page-about .ab-node::before {
    left: -22px;
    top: 24px;
  }

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

  .page-about .ab-team__left {
    padding-right: 16px;
    border-right: 1px solid rgba(26, 33, 29, 0.16);
  }
}

@media (min-width: 1100px) {
  .page-about .ab-hero__title {
    max-width: 14em;
  }

  .page-about .ab-end__inner {
    display: grid;
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    grid-template-areas:
      "line text"
      "line actions";
    column-gap: clamp(24px, 4vw, 56px);
    align-items: end;
  }

  .page-about .ab-end__line {
    grid-area: line;
    margin-bottom: 0;
  }

  .page-about .ab-end__text {
    grid-area: text;
    margin-bottom: 18px;
  }

  .page-about .ab-end__actions {
    grid-area: actions;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node,
  .page-about .ab-stops__btn,
  .page-about .ab-roster__bar {
    transition: none;
  }
}