.page-about {
  --ab-hair: rgba(70, 227, 230, .22);
  --ab-soft: rgba(122, 154, 184, .16);
  --ab-card: rgba(12, 33, 54, .74);
  --ab-card-hi: rgba(20, 50, 78, .72);
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 14px 0 2px;
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--mist-300);
}

.page-about .ab-crumb__link {
  color: var(--mist-300);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-crumb__link:hover,
.page-about .ab-crumb__link:focus-visible {
  color: var(--cyan-400);
  border-color: var(--cyan-400);
}

.page-about .ab-crumb__cur {
  color: var(--cyan-400);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 10px 0 0;
  overflow: hidden;
}

.page-about .ab-hero__blade {
  position: absolute;
  top: -140px;
  right: -160px;
  width: min(720px, 108vw);
  height: 460px;
  border-radius: 0 0 0 46%;
  background:
    radial-gradient(120% 120% at 82% 4%, rgba(70, 227, 230, .18), rgba(70, 227, 230, 0) 60%),
    radial-gradient(96% 96% at 100% 34%, rgba(42, 85, 120, .46), rgba(7, 20, 38, 0) 72%);
  pointer-events: none;
}

.page-about .ab-hero__grid {
  position: relative;
  display: grid;
  gap: 24px;
  padding: 22px 0 0;
}

.page-about .ab-hero__title {
  margin: 12px 0 16px;
  color: var(--white-050);
  font-size: clamp(31px, 8.6vw, 58px);
  line-height: 1.05;
  letter-spacing: -.02em;
  max-width: 15em;
}

.page-about .ab-hero__lead {
  margin: 0;
  color: var(--mist-300);
  font-size: 16px;
  line-height: 1.78;
  max-width: 44em;
}

.page-about .ab-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--ab-hair);
}

.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .ab-fact__k {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 26px;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--cyan-400);
}

.page-about .ab-fact__v {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mist-300);
}

.page-about .ab-hero__fig {
  margin: 0;
  position: relative;
}

.page-about .ab-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--ab-hair);
}

.page-about .ld-media__caption {
  display: block;
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--mist-300);
}

/* 版本刻度 */
.page-about .ab-scale {
  position: relative;
  display: flex;
  justify-content: space-between;
  gap: 0;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-scale::before {
  content: "";
  position: absolute;
  left: 5px;
  right: 5px;
  top: 5px;
  height: 1px;
  background: linear-gradient(90deg, rgba(70, 227, 230, .6), rgba(70, 227, 230, .06));
}

.page-about .ab-scale__n {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 9px;
  font-family: var(--font-display);
  font-size: 10px;
  letter-spacing: .1em;
  color: var(--mist-300);
}

.page-about .ab-scale__n::before {
  content: "";
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--path-500);
}

.page-about .ab-scale__n:last-child::before {
  background: var(--cyan-400);
  border-color: var(--cyan-400);
  box-shadow: 0 0 0 4px rgba(70, 227, 230, .16);
}

.page-about .ab-scale__n:last-child {
  color: var(--cyan-400);
}

/* ---------- 区块骨架 ---------- */
.page-about .ab-section {
  padding: clamp(42px, 7vw, 82px) 0;
}

.page-about .ab-head {
  max-width: 46em;
  margin-bottom: 30px;
}

.page-about .ab-head__title {
  margin: 10px 0 14px;
  color: var(--white-050);
  font-size: clamp(23px, 5.8vw, 36px);
  line-height: 1.18;
  letter-spacing: -.015em;
}

.page-about .ab-head__lead {
  margin: 0;
  color: var(--mist-300);
  font-size: 15px;
  line-height: 1.78;
}

/* ---------- 版本列表 ---------- */
.page-about .ab-versions {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ab-hair);
}

.page-about .ab-ver {
  position: relative;
  display: grid;
  grid-template-columns: 48px 1fr;
  column-gap: 14px;
  padding: 17px 14px 17px 20px;
  border-bottom: 1px solid var(--ab-soft);
  transition: background .18s var(--ease);
}

.page-about .ab-ver::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: var(--cyan-400);
  opacity: 0;
  transition: opacity .18s var(--ease);
}

.page-about .ab-ver:hover,
.page-about .ab-ver:focus-visible {
  background: rgba(20, 50, 78, .4);
}

.page-about .ab-ver:hover::before,
.page-about .ab-ver:focus-visible::before {
  opacity: 1;
}

.page-about .ab-ver:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: -2px;
}

.page-about .ab-ver__num {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.35;
  letter-spacing: .03em;
  color: var(--cyan-400);
}

.page-about .ab-ver__title {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.45;
  color: var(--white-050);
}

.page-about .ab-ver__body {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  color: var(--mist-300);
  font-size: 14px;
  line-height: 1.72;
  transition: max-height .3s var(--ease), opacity .2s var(--ease), margin-top .3s var(--ease);
}

.page-about .ab-ver:hover .ab-ver__body,
.page-about .ab-ver:focus-visible .ab-ver__body {
  max-height: 180px;
  opacity: 1;
  margin-top: 8px;
}

/* ---------- 索引服务 ---------- */
.page-about .ab-index {
  background: linear-gradient(180deg, rgba(12, 33, 54, .0), rgba(12, 33, 54, .6) 26%, rgba(12, 33, 54, .0));
}

.page-about .ab-split {
  display: grid;
  gap: 26px;
}

.page-about .ab-flow {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
}

.page-about .ab-flow__i {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  border-radius: var(--r-pill);
  border: 1px solid var(--ab-hair);
  background: rgba(20, 50, 78, .4);
}

.page-about .ab-flow__n {
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--cyan-400);
}

.page-about .ab-flow__t {
  font-size: 13px;
  color: var(--white-050);
}

.page-about .ab-split__p {
  margin: 0 0 14px;
  color: var(--mist-300);
  font-size: 15px;
  line-height: 1.78;
  max-width: 42em;
}

.page-about .ab-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 34px;
  list-style: none;
  margin: 22px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--ab-hair);
}

.page-about .ab-metrics li {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.page-about .ab-metrics__k {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 24px;
  line-height: 1;
  color: var(--cyan-400);
}

.page-about .ab-metrics__v {
  font-size: 11px;
  letter-spacing: .09em;
  color: var(--mist-300);
}

.page-about .ab-split__fig {
  margin: 0;
}

.page-about .ab-split__fig img,
.page-about .ab-wide-fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-lg);
  border: 1px solid var(--ab-hair);
}

/* ---------- 分类与区域 ---------- */
.page-about .ab-cols {
  display: grid;
  gap: 20px;
}

.page-about .ab-panel {
  padding: 22px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--ab-hair);
  background: var(--ab-card);
}

.page-about .ab-panel--light {
  background: var(--white-050);
  border-color: var(--line-200);
}

.page-about .ab-panel__title {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--white-050);
}

.page-about .ab-panel--light .ab-panel__title {
  color: var(--ink-900);
}

.page-about .ab-panel__note {
  margin: 0 0 18px;
  font-size: 12px;
  line-height: 1.65;
  color: var(--mist-300);
}

.page-about .ab-panel--light .ab-panel__note {
  color: var(--ink-text);
}

.page-about .ab-panel__foot {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-text);
}

.page-about .ab-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-bar {
  display: grid;
  grid-template-columns: 72px 1fr;
  align-items: center;
  gap: 12px;
}

.page-about .ab-bar__k {
  font-size: 13px;
  color: var(--white-050);
}

.page-about .ab-bar__track {
  display: block;
  height: 8px;
  border-radius: var(--r-pill);
  background: rgba(42, 85, 120, .42);
  overflow: hidden;
}

.page-about .ab-bar__fill {
  display: block;
  height: 100%;
  width: 0;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--cyan-deep), var(--cyan-400));
  animation: ab-fill .9s var(--ease) forwards;
}

.page-about .ab-bar:nth-child(1) .ab-bar__fill { width: 92%; animation-delay: .05s; }
.page-about .ab-bar:nth-child(2) .ab-bar__fill { width: 74%; animation-delay: .12s; }
.page-about .ab-bar:nth-child(3) .ab-bar__fill { width: 61%; animation-delay: .19s; }
.page-about .ab-bar:nth-child(4) .ab-bar__fill { width: 48%; animation-delay: .26s; }
.page-about .ab-bar:nth-child(5) .ab-bar__fill { width: 36%; animation-delay: .33s; }
.page-about .ab-bar:nth-child(6) .ab-bar__fill { width: 27%; animation-delay: .4s; }

@keyframes ab-fill {
  from { transform: scaleX(0); transform-origin: left center; }
  to { transform: scaleX(1); transform-origin: left center; }
}

.page-about .ab-cells {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(13, 1fr);
  gap: 5px;
}

.page-about .ab-cells li {
  aspect-ratio: 1 / 1;
  border-radius: 4px;
  background: rgba(42, 85, 120, .3);
  border: 1px solid var(--line-200);
}

.page-about .ab-cells li.is-hot {
  background: var(--cyan-400);
  border-color: var(--cyan-deep);
  box-shadow: 0 0 0 2px rgba(70, 227, 230, .22);
}

.page-about .ab-hot {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  border-top: 1px solid var(--line-200);
  padding-top: 16px;
}

.page-about .ab-hot li {
  display: grid;
  gap: 3px;
}

.page-about .ab-hot__n {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--ink-900);
}

.page-about .ab-hot__d {
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-text);
}

.page-about .ab-wide-fig {
  margin: 30px 0 0;
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 16px;
}

.page-about .ab-team__card {
  position: relative;
  padding: 22px 20px 22px 22px;
  border-radius: var(--r-md);
  border: 1px solid var(--ab-hair);
  background: var(--ab-card);
  transition: transform .18s var(--ease), background .18s var(--ease);
}

.page-about .ab-team__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 2px;
  border-radius: 2px;
  background: var(--cyan-400);
  opacity: .35;
  transition: opacity .18s var(--ease);
}

.page-about .ab-team__card:hover {
  transform: translateY(-4px);
  background: var(--ab-card-hi);
}

.page-about .ab-team__card:hover::before {
  opacity: 1;
}

.page-about .ab-team__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 34px;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--cyan-400);
}

.page-about .ab-team__h {
  margin: 10px 0 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--white-050);
}

.page-about .ab-team__p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist-300);
}

.page-about .ab-team__tail {
  margin: 26px 0 0;
  padding-top: 20px;
  border-top: 1px solid var(--ab-hair);
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist-300);
  max-width: 48em;
}

.page-about .ab-link {
  color: var(--cyan-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(70, 227, 230, .4);
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  border-color: var(--cyan-400);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-coops {
  display: grid;
  gap: 12px;
}

.page-about .ab-coop {
  border-radius: var(--r-md);
  border: 1px solid var(--ab-hair);
  background: var(--ab-card);
  overflow: hidden;
  transition: background .18s var(--ease);
}

.page-about .ab-coop[open] {
  background: var(--ab-card-hi);
}

.page-about .ab-coop__sum {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 17px 18px;
  cursor: pointer;
  list-style: none;
  min-height: 56px;
}

.page-about .ab-coop__sum::-webkit-details-marker {
  display: none;
}

.page-about .ab-coop__sum::after {
  content: "+";
  order: 3;
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--cyan-400);
  line-height: 1;
}

.page-about .ab-coop[open] .ab-coop__sum::after {
  content: "–";
}

.page-about .ab-coop__sum:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: -2px;
}

.page-about .ab-coop__name {
  flex: 1 1 auto;
  font-size: 15px;
  color: var(--white-050);
}

.page-about .ab-coop__count {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 20px;
  color: var(--cyan-400);
}

.page-about .ab-coop__body {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--mist-300);
}

.page-about .ab-coop-foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 26px;
  padding: 22px 20px;
  border-radius: var(--r-md);
  border: 1px dashed var(--ab-hair);
}

.page-about .ab-coop-foot__p {
  flex: 1 1 260px;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist-300);
}

.page-about .ab-coop-foot__btn {
  flex: 0 0 auto;
}

/* ---------- 运营现状 ---------- */
.page-about .ab-now {
  position: relative;
}

.page-about .ab-now::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 2px;
  background: linear-gradient(180deg, rgba(70, 227, 230, 0), rgba(70, 227, 230, .5), rgba(70, 227, 230, 0));
  pointer-events: none;
}

.page-about .ab-now__grid {
  display: grid;
  gap: 28px;
}

.page-about .ab-now__p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist-300);
  max-width: 42em;
}

.page-about .ab-now__side {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
}

.page-about .ab-now__stat {
  padding: 18px 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--ab-hair);
  background: rgba(12, 33, 54, .66);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-now__k {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 27px;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--cyan-400);
}

.page-about .ab-now__v {
  font-size: 11px;
  letter-spacing: .09em;
  color: var(--mist-300);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-hero__grid {
    grid-template-columns: 1fr;
  }

  .page-about .ab-cols {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

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

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

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

@media (min-width: 960px) {
  .page-about .ab-hero {
    padding-top: 26px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.06fr);
    align-items: start;
    gap: 40px;
    padding-top: 34px;
  }

  .page-about .ab-hero__copy {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .ab-hero__fig {
    grid-column: 2;
    grid-row: 1;
    margin-top: 10px;
  }

  .page-about .ab-scale {
    margin-top: 54px;
  }

  .page-about .ab-ver {
    grid-template-columns: 62px 1fr;
    column-gap: 22px;
    padding: 20px 18px 20px 24px;
  }

  .page-about .ab-ver__num {
    font-size: 21px;
  }

  .page-about .ab-ver__title {
    font-size: 17px;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
    align-items: start;
    gap: 40px;
  }

  .page-about .ab-split__fig {
    margin-top: 6px;
  }

  .page-about .ab-now__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
    gap: 44px;
  }

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

  .page-about .ab-panel {
    padding: 28px 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-bar__fill {
    animation: none;
    transform: none;
  }

  .page-about .ab-ver__body,
  .page-about .ab-ver,
  .page-about .ab-team__card,
  .page-about .ab-link,
  .page-about .ab-crumb__link {
    transition: none;
  }

  .page-about .ab-team__card:hover {
    transform: none;
  }
}