.page-about {
  --ab-rail: 112px;
  --ab-gap: 44px;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 36px 0 56px;
  background:
    radial-gradient(120% 90% at 82% -12%, rgba(22, 227, 210, 0.10), transparent 62%),
    linear-gradient(180deg, #08111F 0%, var(--ink) 100%);
  border-bottom: 1px solid var(--edge);
  overflow: hidden;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(27, 46, 82, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(27, 46, 82, 0.5) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: 0.35;
  pointer-events: none;
}

.page-about .ab-hero .xt-shell {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__crumbs {
  margin-bottom: 24px;
}

.page-about .ab-hero__grid {
  align-items: start;
  gap: 28px;
}

.page-about .ab-hero__title {
  margin: 0.35em 0 0.4em;
  font-size: clamp(32px, 6.2vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.page-about .ab-hero__lede {
  max-width: 36em;
  color: var(--text);
}

/* 速览玻璃卡 */
.page-about .ab-quick {
  padding: 20px 22px 16px;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(13, 26, 49, 0.92), rgba(13, 26, 49, 0.58));
  backdrop-filter: blur(10px);
}

.page-about .ab-quick__cap {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .ab-quick__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-quick__list li {
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 10px 0;
  border-top: 1px solid rgba(27, 46, 82, 0.7);
  font-size: var(--fs-14);
}

.page-about .ab-quick__list li:first-child {
  border-top: 0;
}

.page-about .ab-quick__y {
  color: var(--mist);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
}

.page-about .ab-quick__y--now {
  color: var(--gold);
}

.page-about .ab-quick__t {
  color: var(--text);
}

/* 数字条 */
.page-about .ab-stats {
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
}

.page-about .ab-stats li {
  background: var(--ink);
  padding: 18px 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-stats__n {
  color: var(--text-strong);
  font-size: 30px;
  line-height: 1;
}

.page-about .ab-stats__l {
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* ---------- 通用章节 ---------- */
.page-about .ab-section {
  padding: 56px 0;
  border-top: 1px solid var(--edge);
}

.page-about .ab-section--glass {
  background: linear-gradient(180deg, rgba(13, 26, 49, 0.75), rgba(6, 12, 24, 0.2));
}

.page-about .ab-section--last {
  padding-bottom: 88px;
}

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

.page-about .ab-head .xt-h2 {
  margin: 0.35em 0 0.5em;
}

.page-about .ab-head__lede {
  max-width: 44em;
  color: var(--mist);
  font-size: var(--fs-16);
}

/* ---------- 起点 ---------- */
.page-about .ab-origin {
  gap: 30px;
  align-items: start;
}

.page-about .ab-origin__txt {
  margin: 0 0 1.1em;
  color: var(--text);
  max-width: var(--measure);
}

.page-about .ab-origin__tag {
  margin: 20px 0 0;
}

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

.page-about .ab-origin__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  background: var(--panel);
  object-fit: cover;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
  counter-reset: ab-stage;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--edge), rgba(27, 46, 82, 0.25));
}

.page-about .ab-stage {
  position: relative;
  padding: 26px 0 26px;
  border-top: 1px solid var(--edge);
}

.page-about .ab-stage:first-child {
  border-top: 0;
  padding-top: 6px;
}

.page-about .ab-stage::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 34px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(22, 227, 210, 0.14);
}

.page-about .ab-stage:first-child::before {
  top: 14px;
}

.page-about .ab-stage__rail {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.page-about .ab-stage__num {
  font-size: var(--fs-20);
  color: var(--cyan);
  letter-spacing: 0.06em;
}

.page-about .ab-stage__body .xt-h3 {
  margin: 0 0 0.6em;
}

.page-about .ab-stage__body p {
  margin: 0 0 0.9em;
  color: var(--text);
  max-width: 46em;
}

.page-about .ab-gain {
  margin-top: 14px;
  padding: 10px 0 10px 14px;
  border-left: 2px solid var(--cyan);
  font-size: var(--fs-14);
  color: var(--mist);
}

.page-about .ab-gain strong {
  display: inline-block;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .ab-timeline__fig {
  margin-top: 40px;
}

.page-about .ab-timeline__img,
.page-about .ab-cover__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  background: var(--panel);
  object-fit: cover;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 22px;
}

.page-about .ab-team__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .xt-tab {
  font: inherit;
  font-size: var(--fs-14);
  letter-spacing: 0.02em;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--edge);
  background: rgba(13, 26, 49, 0.65);
  color: var(--mist);
  cursor: pointer;
  transition: color 120ms var(--ease), border-color 120ms var(--ease), background 120ms var(--ease);
}

.page-about .xt-tab:hover {
  color: var(--text-strong);
  border-color: rgba(22, 227, 210, 0.5);
}

.page-about .xt-tab[aria-selected="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

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

.page-about .ab-role {
  padding: 22px 22px 18px;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(13, 26, 49, 0.9), rgba(13, 26, 49, 0.5));
}

.page-about .ab-role .xt-h3 {
  margin: 0 0 0.6em;
}

.page-about .ab-role p {
  margin: 0 0 0.9em;
  color: var(--text);
  max-width: 46em;
}

.page-about .ab-role__meta {
  font-size: var(--fs-14);
  color: var(--mist);
  padding-top: 12px;
  border-top: 1px solid rgba(27, 46, 82, 0.85);
}

.page-about .ab-role__meta strong {
  color: var(--cyan);
  font-weight: 600;
  margin-right: 6px;
}

/* ---------- 覆盖范围 ---------- */
.page-about .ab-cover {
  display: grid;
  gap: 34px;
}

.page-about .ab-cover__list .xt-details {
  border-top: 1px solid var(--edge);
}

.page-about .ab-cover__list .xt-details:last-of-type {
  border-bottom: 1px solid var(--edge);
}

.page-about .ab-cover__note {
  margin: 20px 0 0;
  font-size: var(--fs-14);
  color: var(--mist);
  max-width: 44em;
}

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

.page-about .ab-map__grid line {
  stroke: rgba(27, 46, 82, 0.55);
  stroke-width: 1;
}

.page-about .ab-map__lines line {
  stroke: rgba(22, 227, 210, 0.45);
  stroke-width: 1.4;
}

.page-about .ab-map__remote line {
  stroke: rgba(147, 160, 184, 0.5);
  stroke-width: 1.2;
  stroke-dasharray: 6 6;
}

.page-about .ab-map__node {
  fill: rgba(22, 227, 210, 0.85);
}

.page-about .ab-map__node--hub {
  fill: var(--cyan);
}

.page-about .ab-map__node--far {
  fill: rgba(147, 160, 184, 0.85);
}

.page-about .ab-legend {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  font-size: var(--fs-12);
  color: var(--mist);
}

.page-about .ab-legend li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .ab-legend__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(22, 227, 210, 0.85);
  flex: none;
}

.page-about .ab-legend__dot--hub {
  background: var(--cyan);
}

.page-about .ab-legend__dot--far {
  background: rgba(147, 160, 184, 0.85);
}

.page-about .ab-cover__fig {
  margin-top: 24px;
}

/* ---------- 合作与荣誉 ---------- */
.page-about .ab-honor {
  display: grid;
  gap: 1px;
  background: var(--edge);
  border: 1px solid var(--edge);
}

.page-about .ab-honor__cell {
  background: var(--panel);
  padding: 28px 24px;
}

.page-about .ab-honor__n {
  display: block;
  margin: 0 0 12px;
  font-size: 48px;
  line-height: 1;
  color: var(--text-strong);
}

.page-about .ab-honor__cell .xt-h3 {
  margin: 0 0 0.6em;
}

.page-about .ab-honor__cell p {
  margin: 0 0 0.9em;
  color: var(--text);
  max-width: 40em;
}

.page-about .ab-honor__note {
  font-size: var(--fs-14);
  color: var(--mist);
  padding-top: 12px;
  border-top: 1px solid rgba(27, 46, 82, 0.85);
}

/* ---------- 收尾纸面层 ---------- */
.page-about .ab-paper {
  padding: 34px 26px 30px;
}

.page-about .ab-paper .xt-h2 {
  margin: 0.35em 0 0.6em;
  color: var(--paper-ink);
}

.page-about .ab-paper p {
  color: var(--paper-ink);
  max-width: var(--measure);
  margin: 0 0 1.1em;
}

.page-about .ab-paper__meta {
  font-size: var(--fs-14);
  padding-top: 12px;
  border-top: 1px solid rgba(16, 25, 43, 0.18);
}

.page-about .ab-paper__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 6px;
}

.page-about .ab-paper__links a {
  color: var(--cyan-deep);
  font-size: var(--fs-14);
  text-decoration: none;
  border-bottom: 1px solid rgba(14, 143, 138, 0.4);
  padding-bottom: 2px;
  transition: border-color 120ms var(--ease), color 120ms var(--ease);
}

.page-about .ab-paper__links a:hover {
  color: var(--paper-ink);
  border-color: var(--paper-ink);
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-stats li {
    padding: 22px 22px 18px;
  }

  .page-about .ab-stats__n {
    font-size: 38px;
  }

  .page-about .ab-cover__list .xt-details {
    padding: 4px 0;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 48px 0 72px;
  }

  .page-about .ab-stats {
    margin-top: 48px;
  }

  .page-about .ab-section {
    padding: 80px 0;
  }

  .page-about .ab-section--last {
    padding-bottom: 104px;
  }

  .page-about .ab-head {
    margin-bottom: 42px;
  }

  .page-about .ab-origin {
    gap: 48px;
  }

  .page-about .ab-timeline {
    padding-left: 0;
  }

  .page-about .ab-timeline::before {
    left: 55px;
    top: 12px;
    bottom: 12px;
  }

  .page-about .ab-stage {
    display: grid;
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: 0 var(--ab-gap);
    padding: 34px 0;
    align-items: start;
  }

  .page-about .ab-stage:first-child {
    padding-top: 8px;
  }

  .page-about .ab-stage::before {
    left: 51px;
    top: 42px;
  }

  .page-about .ab-stage:first-child::before {
    top: 20px;
  }

  .page-about .ab-stage__rail {
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
    margin-bottom: 0;
    padding-right: 4px;
    position: relative;
    z-index: 1;
  }

  .page-about .ab-stage__num {
    font-size: var(--fs-28);
  }

  .page-about .ab-team__panels {
    grid-template-columns: minmax(0, 1fr);
    max-width: 62em;
  }

  .page-about .ab-cover {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 52px;
    align-items: start;
  }

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

  .page-about .ab-honor__cell {
    padding: 38px 34px;
  }

  .page-about .ab-honor__n {
    font-size: 56px;
  }

  .page-about .ab-paper {
    padding: 52px 56px 46px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .xt-tab,
  .page-about .ab-paper__links a {
    transition: opacity 120ms linear;
  }
}