.page-about {
  --ab-gap: clamp(56px, 8vw, 96px);
  color: var(--moon);
}

/* ---------- 面包屑留白 ---------- */
.page-about .breadcrumb {
  margin-bottom: 28px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 4px 0 clamp(56px, 7vw, 88px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  left: 0;
  right: 46%;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--violet), rgba(107, 76, 230, 0));
  pointer-events: none;
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  align-items: end;
}

.page-about .ab-hero__media {
  margin: 0;
  overflow: hidden;
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .ab-hero__copy h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 4.2vw, 52px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--moon);
}

.page-about .ab-hero__lede {
  max-width: 48ch;
  margin: 20px 0 0;
  font-size: 17px;
  line-height: 1.9;
  color: var(--stardust);
}

.page-about .ab-hero__meta {
  list-style: none;
  margin: 32px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--grid-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 16px 34px;
}

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

.page-about .ab-hero__meta span {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stardust);
}

.page-about .ab-hero__meta strong {
  font-family: var(--font-mono);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ice);
}

/* ---------- 出发点 ---------- */
.page-about .ab-belief {
  padding: 8px 0 var(--ab-gap);
}

.page-about .ab-belief__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .ab-belief__aside {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--magenta);
}

.page-about .ab-belief__body {
  max-width: 64ch;
}

.page-about .ab-belief__body p {
  margin: 22px 0 0;
  font-size: 17px;
  line-height: 1.92;
  color: var(--stardust);
}

.page-about .ab-belief__body p:first-of-type {
  margin-top: 26px;
  font-size: 18px;
  color: var(--moon);
}

.page-about .ab-tenets {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--grid-soft);
  border: 1px solid var(--grid-soft);
}

.page-about .ab-tenets li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 18px 20px;
  background: var(--deep);
}

.page-about .ab-tenets__k {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--violet);
}

.page-about .ab-tenets p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--moon);
}

/* ---------- 发展脉络 ---------- */
.page-about .ab-timeline {
  padding: 0 0 var(--ab-gap);
}

.page-about .ab-timeline__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  margin-top: 40px;
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .ab-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .ab-rail .index-link {
  display: inline-block;
  padding: 7px 15px;
  border: 1px solid var(--grid-soft);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--stardust);
  text-decoration: none;
  white-space: nowrap;
  border-radius: var(--radius);
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .ab-rail .index-link:hover {
  color: var(--ice);
  border-color: var(--violet);
}

.page-about .ab-rail .index-link.is-current {
  color: var(--moon);
  border-color: var(--violet);
  background: var(--violet-soft);
}

.page-about .ab-stages {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .ab-stage {
  scroll-margin-top: calc(var(--topbar-h) + 28px);
}

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

.page-about .ab-stage__year {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--violet);
}

.page-about .ab-stage__title {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--moon);
}

.page-about .ab-stage__acc .acc__a p {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--stardust);
}

.page-about .ab-stage__facts {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 1px;
  background: var(--grid-soft);
  border: 1px solid var(--grid-soft);
}

.page-about .ab-stage__facts li {
  padding: 12px 15px;
  background: var(--nebula);
}

.page-about .ab-stage__facts span {
  display: block;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stardust);
}

.page-about .ab-stage__facts strong {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ice);
}

.page-about .ab-timeline__figure {
  margin: 52px 0 0;
  overflow: hidden;
}

.page-about .ab-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ---------- 编辑准则 ---------- */
.page-about .ab-standards {
  padding: 0 0 var(--ab-gap);
}

.page-about .ab-standards__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}

.page-about .ab-standards__media {
  margin: 0;
  overflow: hidden;
}

.page-about .ab-standards__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .ab-standards__lede {
  margin: 24px 0 0;
  font-size: 17px;
  line-height: 1.9;
  color: var(--stardust);
}

.page-about .ab-steps {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  border-top: 1px solid var(--grid-soft);
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 22px 0;
  border-bottom: 1px solid var(--grid-soft);
}

.page-about .ab-step__n {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--magenta);
}

.page-about .ab-step__t {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--moon);
}

.page-about .ab-step__d {
  margin: 0;
  font-size: 16px;
  line-height: 1.88;
  color: var(--stardust);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  padding: 0 0 var(--ab-gap);
}

.page-about .ab-team__grid {
  list-style: none;
  margin: 38px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--grid-soft);
  border: 1px solid var(--grid-soft);
}

.page-about .ab-team__card {
  position: relative;
  padding: 28px 24px 32px;
  background: var(--nebula);
}

.page-about .ab-team__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 42px;
  height: 2px;
  background: var(--violet);
}

.page-about .ab-team__count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .ab-team__count span {
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--stardust);
}

.page-about .ab-team__name {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--moon);
}

.page-about .ab-team__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--stardust);
}

/* ---------- 收尾入口 ---------- */
.page-about .ab-actions {
  padding: 0 0 60px;
}

.page-about .ab-actions__panel {
  position: relative;
  overflow: hidden;
  padding: 40px 26px;
  border: 1px solid var(--grid-soft);
  background:
    radial-gradient(120% 150% at 100% 0%, rgba(107, 76, 230, 0.24), rgba(107, 76, 230, 0) 62%),
    var(--nebula);
}

.page-about .ab-actions__panel::after {
  content: "";
  position: absolute;
  right: -140px;
  top: -160px;
  width: 420px;
  height: 420px;
  border: 1px solid var(--grid);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .ab-actions__text {
  position: relative;
  max-width: 58ch;
}

.page-about .ab-actions__text p {
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--stardust);
}

.page-about .ab-actions__links {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .ab-belief__grid {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .ab-step {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 28px;
    align-items: baseline;
  }

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

  .page-about .ab-actions__panel {
    padding: 56px 56px;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-timeline__grid {
    grid-template-columns: 128px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .ab-rail {
    position: sticky;
    top: calc(var(--topbar-h) + 32px);
    align-self: start;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-about .ab-rail .index-link {
    display: block;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 11px 12px;
  }

  .page-about .ab-rail .index-link.is-current {
    border-left-color: var(--violet);
    background: var(--violet-soft);
  }

  .page-about .ab-standards__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.06fr);
    gap: 60px;
  }

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

@media (min-width: 1200px) {
  .page-about .ab-actions__panel {
    padding: 64px 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail .index-link,
  .page-about .ab-actions__panel {
    transition: none;
  }
}
<<<PAGE_CSS_END>>>