.page-about {
  position: relative;
  overflow-x: clip;
  padding-top: calc(var(--header-h) + 26px);
  background-image: linear-gradient(160deg, #1B1129 0%, #2A1B3D 46%, #3D2657 100%);
  color: var(--cream);
  font-family: var(--font-body);
}

.page-about .ab-orb {
  position: absolute;
  top: -120px;
  right: -140px;
  width: 380px;
  height: 380px;
  pointer-events: none;
  background: radial-gradient(circle, rgba(232, 176, 75, .24) 0%, rgba(232, 176, 75, .06) 42%, transparent 70%);
  z-index: 0;
}

.page-about .wrap {
  position: relative;
  z-index: 1;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-bottom: 52px;
}

.page-about .ab-hero .breadcrumb {
  margin-bottom: 26px;
}

.page-about .ab-hero__title {
  margin: 12px 0 18px;
  font-family: var(--font-display);
  font-size: 30px;
  line-height: 1.3;
  font-weight: 900;
  letter-spacing: .01em;
  color: var(--cream);
  text-shadow: 0 0 26px rgba(232, 176, 75, .22);
}

.page-about .ab-hero__lead {
  margin: 0;
  max-width: 40em;
  font-size: 17px;
  line-height: 1.9;
  color: rgba(245, 239, 230, .78);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 20px;
  margin: 34px 0 0;
  padding: 0;
}

.page-about .ab-stat {
  border-top: 1px solid var(--line-gold);
  padding-top: 12px;
}

.page-about .ab-stat dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: rgba(245, 239, 230, .58);
  text-transform: uppercase;
}

.page-about .ab-stat dd {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 900;
  color: var(--gold-light);
  letter-spacing: .01em;
}

.page-about .ab-hero__media {
  margin: 38px 0 0;
}

.page-about .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-l);
  border: 1px solid var(--line);
  object-fit: cover;
}

.page-about .media__cap {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(245, 239, 230, .52);
}

/* ---------- 通用章节 ---------- */
.page-about .ab-section {
  position: relative;
  padding: 56px 0;
}

.page-about .ab-head {
  margin-bottom: 34px;
}

.page-about .ab-head__num {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-about .ab-head__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 24px;
  line-height: 1.36;
  font-weight: 900;
  color: var(--cream);
}

.page-about .ab-head__lead {
  margin: 0;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(245, 239, 230, .74);
}

.page-about .ab-inline-link {
  color: var(--gold-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(232, 176, 75, .5);
  transition: color .24s var(--ease), border-color .24s var(--ease);
}

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

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 0 36px;
  list-style: none;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, rgba(232, 176, 75, .1), var(--gold) 14%, var(--gold) 84%, rgba(232, 176, 75, .1));
  opacity: .6;
}

.page-about .ab-era {
  position: relative;
  padding: 0 0 38px;
}

.page-about .ab-era:last-child {
  padding-bottom: 0;
}

.page-about .ab-era::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 10px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--night);
  border: 1px solid var(--gold);
  box-shadow: 0 0 0 4px rgba(232, 176, 75, .1);
}

.page-about .ab-era__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-size: 34px;
  line-height: 1;
  font-weight: 300;
  letter-spacing: .02em;
  color: rgba(232, 176, 75, .72);
}

.page-about .ab-era__title {
  margin: 0 0 10px;
  font-size: 18px;
  line-height: 1.5;
  font-weight: 900;
  color: var(--cream);
}

.page-about .ab-era__text {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(245, 239, 230, .72);
}

/* ---------- 入口分工树 ---------- */
.page-about .ab-tree__grid {
  position: relative;
  display: grid;
  gap: 18px;
  padding-left: 30px;
}

.page-about .ab-tree__grid::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 16px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(180deg, transparent, rgba(232, 176, 75, .7) 18%, rgba(232, 176, 75, .7) 82%, transparent);
}

.page-about .ab-node {
  position: relative;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: linear-gradient(160deg, rgba(75, 46, 107, .55) 0%, rgba(42, 27, 61, .8) 100%);
  transition: border-color .28s var(--ease), transform .28s var(--ease), box-shadow .28s var(--ease);
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 40px;
  width: 30px;
  height: 1px;
  background: rgba(232, 176, 75, .5);
}

.page-about .ab-node:hover {
  border-color: var(--line-gold);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
}

.page-about .ab-node__tag {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--snow);
  text-transform: uppercase;
}

.page-about .ab-node__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 900;
  color: var(--cream);
}

.page-about .ab-node__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 239, 230, .72);
}

/* ---------- 版本节奏 ---------- */
.page-about .ab-versions {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 78%;
  gap: 14px;
  margin: 0;
  padding: 4px 0 14px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-version {
  scroll-snap-align: start;
  padding: 22px 20px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--gold);
  border-radius: var(--radius-m);
  background: linear-gradient(155deg, rgba(61, 38, 87, .66) 0%, rgba(26, 16, 39, .82) 100%);
}

.page-about .ab-version__q {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: rgba(168, 216, 220, .16);
  color: var(--snow);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
}

.page-about .ab-version__title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 900;
  color: var(--cream);
}

.page-about .ab-version__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 239, 230, .72);
}

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

/* ---------- 覆盖范围 ---------- */
.page-about .ab-coverage {
  display: grid;
  gap: 26px;
}

.page-about .ab-map {
  position: relative;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: radial-gradient(120% 100% at 72% 18%, rgba(75, 46, 107, .62) 0%, rgba(20, 16, 28, .78) 72%);
}

.page-about .ab-map__dots {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(217, 195, 165, .3) 1.4px, transparent 1.5px);
  background-size: 20px 20px;
  background-position: 4px 6px;
}

.page-about .ab-map__pin {
  position: absolute;
  left: 12%;
  top: 30%;
  display: grid;
  place-items: center;
  width: 78px;
  height: 78px;
  border-radius: 50%;
  border: 1px solid var(--gold);
  background: radial-gradient(circle, rgba(232, 176, 75, .42) 0%, rgba(232, 176, 75, .08) 62%, transparent 74%);
  color: var(--gold-light);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  animation: ab-pin-pulse 4.4s ease-in-out infinite;
}

@keyframes ab-pin-pulse {
  0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(232, 176, 75, .28); }
  50% { transform: scale(1.06); box-shadow: 0 0 0 14px rgba(232, 176, 75, 0); }
}

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

.page-about .ab-covfact {
  display: grid;
  grid-template-columns: minmax(74px, auto) 1fr;
  gap: 14px;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: var(--hair);
}

.page-about .ab-covfact:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .ab-covfact__num {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 900;
  color: var(--gold-light);
  letter-spacing: .01em;
}

.page-about .ab-covfact__label {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 239, 230, .74);
}

/* ---------- 团队分工 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 28px;
}

.page-about .ab-team__list {
  display: grid;
  gap: 18px;
}

.page-about .ab-duty {
  position: relative;
  padding: 20px 18px 20px 22px;
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background: rgba(42, 27, 61, .5);
}

.page-about .ab-duty::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  bottom: 18px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold), rgba(232, 176, 75, .12));
}

.page-about .ab-duty__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .ab-duty__title {
  margin: 8px 0 8px;
  font-size: 18px;
  font-weight: 900;
  color: var(--cream);
}

.page-about .ab-duty__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 239, 230, .72);
}

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

.page-about .ab-pathwrap {
  margin-top: 34px;
  padding: 22px 20px;
  border-radius: var(--radius-l);
  border: 1px dashed rgba(232, 176, 75, .32);
  background: rgba(26, 16, 39, .5);
}

.page-about .ab-pathwrap__label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
}

.page-about .ab-path {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-path__item {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  background: rgba(75, 46, 107, .6);
  border: 1px solid var(--line);
}

.page-about .ab-path__num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--gold-light);
}

.page-about .ab-path__label {
  font-size: 15px;
  color: rgba(245, 239, 230, .86);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-head--light .ab-head__title,
.page-about .ab-head--light .ab-head__lead {
  color: var(--cream);
}

.page-about .ab-eco {
  display: grid;
  gap: 14px;
  padding: 22px 18px;
  border-radius: var(--radius-l);
  background: linear-gradient(160deg, #D9C3A5 0%, #C4AA88 100%);
  color: var(--ink);
}

.page-about .ab-eco__item {
  border-radius: var(--radius-m);
  background: rgba(245, 239, 230, .72);
  border: 1px solid rgba(110, 102, 115, .24);
  overflow: hidden;
  transition: border-color .28s var(--ease), box-shadow .28s var(--ease);
}

.page-about .ab-eco__item:hover,
.page-about .ab-eco__item[data-open] {
  border-color: var(--gold-deep);
  box-shadow: 0 14px 30px rgba(20, 16, 28, .18);
}

.page-about .ab-eco__trigger {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 100%;
  padding: 18px 18px 14px;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  color: var(--ink);
}

.page-about .ab-eco__trigger:focus-visible {
  outline: 2px solid var(--gold-deep);
  outline-offset: -3px;
}

.page-about .ab-eco__name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 900;
}

.page-about .ab-eco__hint {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(20, 16, 28, .62);
}

.page-about .ab-eco__panel {
  padding: 0 18px 18px;
}

.page-about .ab-eco__panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(20, 16, 28, .82);
}

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

.page-about .ab-legal__card {
  padding: 20px 18px;
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(61, 38, 87, .6) 0%, rgba(26, 16, 39, .8) 100%);
}

.page-about .ab-legal__label {
  display: inline-block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--snow);
  text-transform: uppercase;
}

.page-about .ab-legal__value {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 900;
  color: var(--gold-light);
  word-break: break-word;
}

.page-about .ab-legal__note {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 239, 230, .7);
}

.page-about .ab-cta {
  margin-top: 34px;
  padding: 26px 20px;
  border-radius: var(--radius-l);
  border: 1px solid var(--line-gold);
  background: radial-gradient(130% 120% at 12% 0%, rgba(232, 176, 75, .16) 0%, rgba(42, 27, 61, .72) 62%);
}

.page-about .ab-cta__text {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(245, 239, 230, .8);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about {
    padding-top: calc(var(--header-h) + 42px);
  }

  .page-about .ab-hero__title {
    font-size: 40px;
  }

  .page-about .ab-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px 26px;
  }

  .page-about .ab-head__title {
    font-size: 30px;
  }

  .page-about .ab-section {
    padding: 74px 0;
  }

  .page-about .ab-tree__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .ab-coverage {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 34px;
    align-items: center;
  }

  .page-about .ab-eco {
    padding: 30px 26px;
  }

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

  .page-about .ab-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 26px;
    padding: 30px 32px;
  }

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

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .ab-hero__title {
    font-size: 50px;
    max-width: 22em;
  }

  .page-about .ab-hero__lead {
    font-size: 18px;
  }

  .page-about .ab-head__title {
    font-size: 36px;
  }

  .page-about .ab-section {
    padding: 92px 0;
  }

  /* 时间轴：左侧大年份，右侧内容 */
  .page-about .ab-timeline {
    padding-left: 0;
  }

  .page-about .ab-timeline::before {
    left: 172px;
    top: 8px;
    bottom: 8px;
  }

  .page-about .ab-era {
    display: grid;
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 48px;
    padding-bottom: 54px;
    align-items: start;
  }

  .page-about .ab-era::before {
    left: 167px;
    top: 16px;
  }

  .page-about .ab-era__year {
    margin: 0;
    font-size: 58px;
    text-align: right;
    color: rgba(245, 239, 230, .26);
  }

  .page-about .ab-era__title {
    font-size: 22px;
    margin-bottom: 12px;
  }

  /* 入口树：横向主干 + 四个下垂节点 */
  .page-about .ab-tree__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px;
    padding-left: 0;
    padding-top: 62px;
  }

  .page-about .ab-tree__grid::before {
    left: 11%;
    right: 11%;
    top: 30px;
    bottom: auto;
    width: auto;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(232, 176, 75, .72) 16%, rgba(232, 176, 75, .72) 84%, transparent);
  }

  .page-about .ab-node {
    padding: 24px 20px;
  }

  .page-about .ab-node::before {
    left: 50%;
    top: -32px;
    width: 1px;
    height: 32px;
  }

  .page-about .ab-node::after {
    content: "";
    position: absolute;
    left: calc(50% - 5px);
    top: -36px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--night);
    border: 1px solid var(--gold);
    transition: background .28s var(--ease), box-shadow .28s var(--ease);
  }

  .page-about .ab-node:hover::after {
    background: var(--gold);
    box-shadow: 0 0 0 6px rgba(232, 176, 75, .16);
  }

  /* 版本：四列铺开 */
  .page-about .ab-versions {
    grid-auto-flow: row;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
    overflow-x: visible;
    padding-bottom: 4px;
  }

  .page-about .ab-version {
    padding: 26px 22px;
  }

  /* 团队 */
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .ab-team__media {
    position: sticky;
    top: calc(var(--header-h-solid) + 26px);
  }

  .page-about .ab-path {
    gap: 14px;
  }

  .page-about .ab-eco__trigger {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
    gap: 20px;
  }
}

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

  .page-about .ab-node,
  .page-about .ab-eco__item,
  .page-about .ab-inline-link {
    transition: none;
  }
}