.page-about {
  --ab-ink-soft: rgba(26, 26, 31, 0.72);
  --ab-ink-faint: rgba(26, 26, 31, 0.6);
  --ab-cyan-line: rgba(47, 110, 112, 0.28);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-18);
  line-height: 1.85;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .ab-topbar {
  border-bottom: 1px solid var(--rule);
  padding-block: 12px;
  background: var(--paper);
}

.page-about .ab-crumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: var(--step-12);
  letter-spacing: 0.08em;
  color: var(--ab-ink-faint);
}

.page-about .ab-crumbs__item + .ab-crumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--plum-soft);
}

.page-about .ab-crumbs__link {
  color: var(--cyan-deep);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-block: 6px;
  display: inline-block;
}

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

.page-about .ab-crumbs__item--current {
  color: var(--plum-ink);
  font-weight: 500;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-block: clamp(48px, 8vw, 104px) clamp(40px, 6vw, 76px);
  background:
    radial-gradient(110% 88% at 92% 0%, rgba(216, 230, 228, 0.95) 0%, rgba(216, 230, 228, 0) 62%),
    var(--paper);
  border-bottom: 1px solid var(--rule);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--plum) 0%, var(--plum-soft) 34%, var(--cyan-deep) 68%, var(--gold) 100%);
  opacity: 0.7;
}

.page-about .ab-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
}

.page-about .ab-hero__kicker {
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--plum-soft);
  margin: 0 0 18px;
}

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(36px, 7vw, 74px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--plum-ink);
  margin: 0 0 24px;
  text-wrap: balance;
}

.page-about .ab-hero__title em {
  font-style: normal;
  font-weight: 600;
  color: var(--plum);
}

.page-about .ab-hero__lead {
  font-size: clamp(16px, 2vw, 18px);
  line-height: 1.9;
  max-width: 38em;
  color: var(--ab-ink-soft);
  margin: 0 0 14px;
}

.page-about .ab-hero__sub {
  font-size: var(--step-14);
  line-height: 1.8;
  max-width: 40em;
  color: var(--ab-ink-faint);
  margin: 0 0 30px;
}

.page-about .ab-hero__cta {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding-inline: 28px;
}

.page-about .ab-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
}

.page-about .ab-facts__item {
  background: rgba(245, 240, 230, 0.92);
  padding: 16px 14px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .ab-facts__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--plum);
}

.page-about .ab-facts__label {
  font-size: var(--step-12);
  letter-spacing: 0.14em;
  color: var(--ab-ink-faint);
}

/* ---------- 通用区块与章节头 ---------- */
.page-about .ab-sec {
  position: relative;
  padding-block: clamp(56px, 9vw, 112px);
}

.page-about .ab-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 16px;
  align-items: baseline;
  margin-bottom: clamp(28px, 4vw, 48px);
  border-top: 1px solid var(--rule);
  padding-top: 22px;
}

.page-about .ab-head__mark {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: var(--step-14);
  letter-spacing: 0.16em;
  color: var(--plum-soft);
}

.page-about .ab-head__title {
  grid-column: 2;
  grid-row: 1;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.32;
  letter-spacing: -0.01em;
  color: var(--plum-ink);
  margin: 0;
}

.page-about .ab-head__note {
  grid-column: 2;
  grid-row: 2;
  margin: 12px 0 0;
  max-width: 46em;
  font-size: var(--step-14);
  line-height: 1.85;
  color: var(--ab-ink-faint);
}

/* ---------- 图 ---------- */
.page-about .ab-fig {
  margin: 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius-organic);
  overflow: hidden;
  background: var(--paper-card);
}

.page-about .ab-fig img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-fig__cap {
  padding: 10px 16px 12px;
  border-top: 1px solid var(--rule);
  font-size: var(--step-12);
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--ab-ink-faint);
}

.page-about .ab-history__fig {
  margin-bottom: clamp(28px, 4vw, 46px);
}

.page-about .ab-history__fig img {
  aspect-ratio: 2 / 1;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 44px;
  position: relative;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 16px;
  bottom: 16px;
  width: 1px;
  background: var(--rule-strong);
}

.page-about .ab-timeline__item {
  position: relative;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: -38px;
  top: 16px;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--plum);
  box-shadow: 0 0 0 4px var(--paper);
}

.page-about .ab-timeline__item--current::before {
  background: var(--paper);
  border: 3px solid var(--gold);
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 6px rgba(215, 164, 68, 0.22);
}

.page-about .ab-ver {
  border-bottom: 1px solid var(--rule);
}

.page-about .ab-ver > summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  min-height: 48px;
  padding: 13px 34px 13px 0;
  position: relative;
}

.page-about .ab-ver > summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-ver > summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 13px;
  font-family: var(--font-mono);
  font-size: var(--step-18);
  line-height: 1;
  color: var(--plum-soft);
  transition: color 0.2s ease;
}

.page-about .ab-ver[open] > summary::after {
  content: "−";
  color: var(--gold-deep);
}

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

.page-about .ab-ver__tag {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--step-14);
  letter-spacing: 0.06em;
  color: var(--plum);
  background: var(--cyan-soft);
  padding: 2px 9px;
  border-radius: 2px;
}

.page-about .ab-ver__name {
  font-family: var(--font-display);
  font-size: clamp(16px, 2.1vw, 21px);
  line-height: 1.5;
  color: var(--plum-ink);
}

.page-about .ab-ver[open] .ab-ver__name {
  color: var(--plum);
}

.page-about .ab-ver__text {
  margin: 0 0 18px;
  padding-right: 34px;
  font-size: var(--step-14);
  line-height: 1.85;
  color: var(--ab-ink-soft);
}

/* ---------- 栏目分类 ---------- */
.page-about .ab-classes {
  background: var(--cyan-soft);
  border-top: 1px solid var(--cyan-line);
  border-bottom: 1px solid var(--cyan-line);
}

.page-about .ab-classes .ab-head {
  border-top-color: var(--ab-cyan-line);
}

.page-about .ab-classes .ab-head__mark {
  color: var(--cyan-deep);
}

.page-about .ab-cats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .ab-cat {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 4px 16px;
  align-items: baseline;
  padding: 20px 0;
  border-bottom: 1px solid var(--ab-cyan-line);
}

.page-about .ab-cat__no {
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.16em;
  color: var(--cyan-deep);
}

.page-about .ab-cat__title {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--step-24);
  line-height: 1.4;
  color: var(--plum-ink);
}

.page-about .ab-cat__count {
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.04em;
  color: var(--paper);
  background: var(--plum);
  padding: 2px 10px;
  border-radius: 999px;
  white-space: nowrap;
}

.page-about .ab-cat__text {
  grid-column: 2;
  margin: 8px 0 0;
  font-size: var(--step-14);
  line-height: 1.85;
  color: var(--ab-ink-soft);
  max-width: 40em;
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
}

.page-about .ab-bar {
  display: flex;
  height: 78px;
  margin: 0 0 26px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-organic);
  overflow: hidden;
}

.page-about .ab-bar__seg {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  min-width: 0;
  padding: 0 12px;
  transition: filter 0.2s ease;
}

.page-about .ab-bar__seg b {
  font-family: var(--font-mono);
  font-size: var(--step-18);
  font-weight: 500;
  line-height: 1;
}

.page-about .ab-bar__seg i {
  font-style: normal;
  font-size: var(--step-12);
  letter-spacing: 0.04em;
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .ab-bar__seg--a { flex: 18 1 0; background: var(--plum-ink); color: var(--paper); }
.page-about .ab-bar__seg--b { flex: 11 1 0; background: var(--plum); color: var(--paper); }
.page-about .ab-bar__seg--c { flex: 9 1 0; background: var(--plum-soft); color: var(--plum-ink); }
.page-about .ab-bar__seg--d { flex: 8 1 0; background: var(--cyan-soft); color: var(--cyan-deep); }

.page-about .ab-bar__seg:hover,
.page-about .ab-bar__seg:focus-within {
  filter: brightness(1.08);
}

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

.page-about .ab-role {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 2px 14px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--rule);
}

.page-about .ab-role__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-top: 0.62em;
}

.page-about .ab-role__dot--a { background: var(--plum-ink); }
.page-about .ab-role__dot--b { background: var(--plum); }
.page-about .ab-role__dot--c { background: var(--plum-soft); }
.page-about .ab-role__dot--d { background: var(--cyan-deep); }

.page-about .ab-role__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--step-18);
  line-height: 1.6;
  color: var(--plum-ink);
}

.page-about .ab-role__text {
  grid-column: 2;
  margin: 4px 0 0;
  font-size: var(--step-14);
  line-height: 1.85;
  color: var(--ab-ink-soft);
}

.page-about .ab-team__fig img {
  aspect-ratio: 9 / 7;
}

/* ---------- 覆盖范围 ---------- */
.page-about .ab-reach {
  background: var(--paper-card);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.page-about .ab-reach__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: center;
}

.page-about .ab-dots {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
  max-width: 320px;
}

.page-about .ab-dots span {
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: rgba(47, 110, 112, 0.16);
  border: 1px solid rgba(47, 110, 112, 0.34);
}

.page-about .ab-dots span:nth-child(7n + 3) {
  background: rgba(74, 52, 104, 0.2);
  border-color: rgba(74, 52, 104, 0.38);
}

.page-about .ab-dots span:last-child {
  background: var(--gold);
  border-color: var(--gold-deep);
}

.page-about .ab-reach__lead {
  margin: 0 0 16px;
  font-size: var(--step-14);
  letter-spacing: 0.04em;
  color: var(--ab-ink-soft);
}

.page-about .ab-reach__big {
  display: block;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(52px, 9vw, 86px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--plum);
  margin-bottom: 6px;
}

.page-about .ab-reach__big em {
  font-style: normal;
  font-size: 0.46em;
  color: var(--cyan-deep);
  margin-left: 3px;
}

.page-about .ab-reach__text {
  margin: 0 0 20px;
  max-width: 38em;
  font-size: var(--step-14);
  line-height: 1.9;
  color: var(--ab-ink-soft);
}

.page-about .ab-reach__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-reach__list li {
  position: relative;
  padding-left: 20px;
  font-size: var(--step-14);
  line-height: 1.8;
  color: var(--plum-ink);
}

.page-about .ab-reach__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 9px;
  height: 2px;
  background: var(--gold-deep);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-eco {
  background:
    radial-gradient(92% 72% at 84% 0%, rgba(74, 52, 104, 0.8) 0%, rgba(74, 52, 104, 0) 62%),
    var(--plum-ink);
  color: var(--paper);
}

.page-about .ab-eco .ab-head {
  border-top-color: var(--rule-paper);
}

.page-about .ab-eco .ab-head__mark {
  color: var(--gold);
}

.page-about .ab-eco .ab-head__title {
  color: var(--paper);
}

.page-about .ab-eco .ab-head__note {
  color: rgba(245, 240, 230, 0.72);
}

.page-about .ab-eco__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  align-items: center;
}

.page-about .ab-eco__fig {
  background: rgba(245, 240, 230, 0.06);
  border-color: var(--rule-paper);
}

.page-about .ab-eco__fig img {
  aspect-ratio: 25 / 16;
}

.page-about .ab-eco__fig .ab-fig__cap {
  border-top-color: var(--rule-paper);
  color: rgba(245, 240, 230, 0.6);
}

.page-about .ab-eco__body p {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: var(--step-14);
  line-height: 1.9;
  color: rgba(245, 240, 230, 0.86);
}

.page-about .ab-eco__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-eco__list li {
  position: relative;
  padding-left: 22px;
  font-size: var(--step-14);
  line-height: 1.8;
  color: rgba(245, 240, 230, 0.92);
}

.page-about .ab-eco__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 12px;
  height: 1px;
  background: var(--gold);
}

.page-about .ab-eco__note {
  margin: 0;
  padding: 12px 16px;
  border: 1px solid rgba(215, 164, 68, 0.5);
  border-radius: var(--radius-organic);
  font-size: var(--step-14);
  line-height: 1.8;
  color: rgba(245, 240, 230, 0.9);
  max-width: 34em;
}

/* ---------- 三条规矩 ---------- */
.page-about .ab-rules {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule-strong);
}

.page-about .ab-rule {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 16px;
  padding: 24px 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .ab-rule__no {
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: 0.18em;
  color: var(--gold-deep);
}

.page-about .ab-rule__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--step-24);
  line-height: 1.45;
  color: var(--plum-ink);
}

.page-about .ab-rule__text {
  grid-column: 2;
  margin: 6px 0 0;
  max-width: 42em;
  font-size: var(--step-14);
  line-height: 1.9;
  color: var(--ab-ink-soft);
}

/* ---------- 收束路径 ---------- */
.page-about .ab-next {
  border-top: 1px solid var(--rule-strong);
  padding-block: clamp(34px, 5vw, 60px);
  background: var(--paper);
}

.page-about .ab-next__text {
  margin: 0 0 6px;
  max-width: 40em;
  font-size: var(--step-14);
  line-height: 1.85;
  color: var(--ab-ink-soft);
}

.page-about .ab-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 28px;
  margin-top: 10px;
}

.page-about .ab-next__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 4px 0;
  font-size: var(--step-14);
  letter-spacing: 0.02em;
  color: var(--cyan-deep);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 110, 112, 0.3);
}

.page-about .ab-next__link span {
  font-family: var(--font-mono);
  transition: transform 0.2s ease;
}

.page-about .ab-next__link:hover span,
.page-about .ab-next__link:focus-visible span {
  transform: translateX(4px);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-cats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 48px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-reach__grid {
    grid-template-columns: 320px minmax(0, 1fr);
    align-items: center;
  }

  .page-about .ab-eco__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .ab-rule {
    grid-template-columns: 64px minmax(200px, 0.85fr) minmax(0, 1.5fr);
    align-items: baseline;
  }

  .page-about .ab-rule__title {
    grid-column: 2;
  }

  .page-about .ab-rule__text {
    grid-column: 3;
    margin-top: 0;
  }
}

@media (max-width: 599px) {
  .page-about .ab-bar {
    height: 64px;
  }

  .page-about .ab-bar__seg {
    padding: 0 6px;
    align-items: center;
  }

  .page-about .ab-bar__seg i {
    display: none;
  }

  .page-about .ab-bar__seg b {
    font-size: var(--step-14);
  }

  .page-about .ab-timeline {
    padding-left: 32px;
  }

  .page-about .ab-timeline::before {
    left: 9px;
  }

  .page-about .ab-timeline__item::before {
    left: -30px;
    width: 12px;
    height: 12px;
    top: 17px;
  }

  .page-about .ab-ver > summary {
    padding-right: 28px;
  }

  .page-about .ab-ver__text {
    padding-right: 4px;
  }

  .page-about .ab-dots {
    max-width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-ver > summary::after,
  .page-about .ab-next__link span,
  .page-about .ab-bar__seg {
    transition: none;
  }

  .page-about .ab-next__link:hover span,
  .page-about .ab-next__link:focus-visible span {
    transform: none;
  }
}
<<<END>>>

.page-about {
  --cyan-line: currentColor;
}