.page-about {
  --ab-rail: 168px;
  background: var(--mist);
  color: var(--ink);
  overflow-x: clip;
}

.page-about .ab-opener {
  padding: 22px 0 var(--space-m);
}

.page-about .ab-opener__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .ab-title {
  margin: 10px 0 0;
  font-size: clamp(32px, 7.2vw, 68px);
  line-height: 0.99;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .ab-opener__body {
  display: grid;
  gap: 16px;
  align-content: end;
}

.page-about .ab-opener__body .lede {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .ab-opener__body .prose {
  margin: 0;
  color: var(--ink-soft);
}

.page-about .ab-metrics {
  list-style: none;
  margin: var(--space-m) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--mist-deep);
  border: 1px solid var(--mist-deep);
}

.page-about .ab-metrics > li {
  background: var(--paper);
  padding: 16px 16px 18px;
}

.page-about .ab-metrics .num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1.1;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--jiang);
}

.page-about .ab-metrics__label {
  display: block;
  margin-top: 6px;
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}

/* 全幅结构图 */
.page-about .ab-plate {
  margin: var(--space-l) 0 0;
  border-top: 1px solid var(--mist-deep);
  border-bottom: 1px solid var(--mist-deep);
  background: var(--paper);
}

.page-about .ab-plate img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .ab-plate figcaption {
  padding: 10px 16px 12px;
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}

/* 年份刻度 */
.page-about .ab-timeline {
  padding: var(--space-l) 0 var(--space-l);
}

.page-about .ab-sec-head {
  margin-bottom: var(--space-m);
  max-width: 52ch;
}

.page-about .ab-sec-head .eyebrow {
  margin: 0;
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--jiang);
}

.page-about .ab-sec-head h2 {
  margin: 10px 0 0;
}

.page-about .ab-sec-head .prose {
  margin: 14px 0 0;
  color: var(--ink-soft);
}

.page-about .ab-timeline__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.page-about .ab-years {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-years::-webkit-scrollbar {
  height: 4px;
}

.page-about .ab-years__item {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
  color: var(--ink-soft);
  text-decoration: none;
  white-space: nowrap;
  padding: 6px 12px;
  background: var(--paper);
  border: 1px solid var(--mist-deep);
  border-radius: 10px 16px 8px 14px;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .ab-years__item:hover,
.page-about .ab-years__item:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

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

.page-about .ab-year {
  position: relative;
  scroll-margin-top: 96px;
  border-left: 3px solid transparent;
  border-bottom: 1px solid var(--mist-deep);
  padding: 0 0 var(--space-m) 16px;
  margin: 0 0 var(--space-m);
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

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

.page-about .ab-year:target {
  border-left-color: var(--orange);
  background: var(--paper);
}

.page-about .ab-year__side {
  display: none;
}

.page-about .ab-year__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 6vw, 42px);
  line-height: 1;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
  color: var(--jiang);
}

.page-about .ab-year__tag {
  margin: 8px 0 0;
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--ink-soft);
}

.page-about .ab-year__text {
  margin: 12px 0 0;
  line-height: 1.9;
  color: var(--ink);
  max-width: 44ch;
}

/* 四类业务归口 */
.page-about .ab-routing {
  padding: var(--space-l) 0;
  background: var(--paper);
  border-top: 1px solid var(--mist-deep);
  border-bottom: 1px solid var(--mist-deep);
}

.page-about .ab-routing__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

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

.page-about .ab-routing__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius-organic);
}

.page-about .ab-routing__figure figcaption {
  margin-top: 12px;
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}

.page-about .ab-routing__list .eyebrow {
  margin: 0;
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--violet);
}

.page-about .ab-routing__list h2 {
  margin: 10px 0 0;
}

.page-about .ab-routing__intro {
  margin: 16px 0 0;
  color: var(--ink-soft);
}

.page-about .ab-route {
  margin-top: 26px;
  border-left: 4px solid var(--cat, var(--jiang));
  padding: 4px 0 4px 16px;
}

.page-about .ab-route__code {
  margin: 0;
  display: block;
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}

.page-about .ab-route h3 {
  margin: 8px 0 8px;
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.2;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-route p {
  margin: 0;
  line-height: 1.9;
  color: var(--ink-soft);
  max-width: 46ch;
}

.page-about .ab-route details {
  margin-top: 12px;
}

.page-about .ab-route summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--jiang);
}

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

.page-about .ab-route summary::before {
  content: "＋ ";
  color: var(--orange);
}

.page-about .ab-route details[open] summary::before {
  content: "－ ";
}

.page-about .ab-groups {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.page-about .ab-groups li {
  display: flex;
  gap: 12px;
  padding-bottom: 5px;
  border-bottom: 1px dotted var(--mist-deep);
}

/* 团队分工 */
.page-about .ab-team {
  padding: var(--space-l) 0;
}

.page-about .ab-team .eyebrow {
  margin: 0;
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--steel);
}

.page-about .ab-team h2 {
  margin: 10px 0 0;
}

.page-about .ab-team__intro {
  margin: 16px 0 0;
  color: var(--ink-soft);
  max-width: 52ch;
}

.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: var(--space-m);
}

.page-about .ab-team-card {
  position: relative;
  background: var(--mist);
  border: 1px solid var(--mist-deep);
  border-radius: var(--radius-organic);
  padding: 28px 24px 30px;
}

.page-about .ab-team-card::before {
  content: "";
  position: absolute;
  left: 24px;
  top: -1px;
  width: 48px;
  height: 4px;
  border-radius: 0 0 3px 3px;
  background: var(--cat, var(--jiang));
}

.page-about .ab-team-card__num {
  margin: 0;
  font-size: var(--fs-14);
  letter-spacing: 0.16em;
  color: var(--cat, var(--jiang));
}

.page-about .ab-team-card h3 {
  margin: 12px 0 12px;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.25;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .ab-team-card p:last-child {
  margin: 0;
  line-height: 1.9;
  color: var(--ink-soft);
}

/* 档位深色分区 */
.page-about .ab-tier {
  padding: 0;
  background: var(--wine);
  color: var(--paper);
}

.page-about .ab-tier__inner {
  padding-top: var(--space-l);
  padding-bottom: var(--space-l);
}

.page-about .ab-tier .eyebrow {
  margin: 0;
  font-size: var(--fs-12);
  letter-spacing: 0.24em;
  color: var(--orange);
}

.page-about .ab-tier h2 {
  margin: 12px 0 0;
  color: var(--paper);
}

.page-about .ab-tier p {
  margin: 18px 0 0;
  line-height: 1.95;
  color: rgba(247, 246, 241, 0.86);
  max-width: 48ch;
}

.page-about .ab-tiers {
  list-style: none;
  margin: var(--space-m) 0 0;
  padding: 0 0 6px;
  display: flex;
  gap: 2px;
}

.page-about .ab-tiers li {
  flex: 0 0 auto;
  min-width: 128px;
  padding: 16px 18px 18px;
  background: rgba(247, 246, 241, 0.07);
  border-top: 2px solid rgba(247, 246, 241, 0.28);
}

.page-about .ab-tiers li:first-child {
  border-top-color: var(--orange);
}

.page-about .ab-tiers .mono {
  display: block;
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  font-variant-numeric: tabular-nums;
  color: var(--orange);
}

.page-about .ab-tier-name {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-17);
  color: var(--paper);
}

.page-about .ab-tier details {
  margin-top: var(--space-m);
  padding-top: 14px;
  border-top: 1px solid rgba(247, 246, 241, 0.24);
  max-width: 58ch;
}

.page-about .ab-tier summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .ab-tier details ul {
  margin: 14px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
  line-height: 1.9;
  color: rgba(247, 246, 241, 0.82);
}

.page-about .ab-tier__figure {
  margin: 0;
  line-height: 0;
}

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

/* 备案与联系 */
.page-about .ab-compliance {
  padding: var(--space-l) 0;
}

.page-about .ab-compliance__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
}

.page-about .ab-compliance .eyebrow {
  margin: 0;
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--wine);
}

.page-about .ab-compliance h2 {
  margin: 10px 0 0;
}

.page-about .ab-compliance h3 {
  margin: 0 0 10px;
  color: var(--ink);
}

.page-about .ab-compliance .prose {
  margin: 16px 0 0;
  color: var(--ink-soft);
}

.page-about .ab-contact {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-contact li {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  align-items: baseline;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--mist-deep);
}

.page-about .ab-contact__k {
  min-width: 88px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}

.page-about .ab-contact__v {
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}

.page-about .ab-compliance__aside {
  background: var(--paper);
  border: 1px solid var(--mist-deep);
  border-radius: var(--radius-organic-alt);
  padding: 28px 24px 30px;
}

.page-about .ab-compliance__aside .copy-chip {
  margin-top: 18px;
}

/* 继续查阅 */
.page-about .ab-next {
  padding: 0 0 var(--space-l);
}

.page-about .ab-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--mist-deep);
}

.page-about .ab-next__list li {
  border-bottom: 1px solid var(--mist-deep);
}

.page-about .ab-next__list a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 16px 4px;
  text-decoration: none;
  color: var(--ink);
}

.page-about .ab-next__idx {
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}

.page-about .ab-next__label {
  font-size: var(--fs-17);
  font-weight: 700;
  transition: color 0.18s var(--ease);
}

.page-about .ab-next__desc {
  margin-left: auto;
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.page-about .ab-next__list a:hover .ab-next__label,
.page-about .ab-next__list a:focus-visible .ab-next__label {
  color: var(--orange);
}

@media (min-width: 760px) {
  .page-about .ab-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 820px) {
  .page-about .ab-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }
}

@media (min-width: 880px) {
  .page-about .ab-timeline__body {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .ab-years {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0 0 0 16px;
    border-left: 1px solid var(--mist-deep);
    position: sticky;
    top: 104px;
  }

  .page-about .ab-years__item {
    position: relative;
    background: none;
    border: 0;
    border-radius: 0;
    padding: 7px 0;
    letter-spacing: 0.1em;
  }

  .page-about .ab-years__item::before {
    content: "";
    position: absolute;
    left: -20px;
    top: 50%;
    width: 10px;
    height: 1px;
    background: var(--mist-deep);
    transform: translateY(-50%);
    transition: width 0.18s var(--ease), background-color 0.18s var(--ease);
  }

  .page-about .ab-years__item:hover::before,
  .page-about .ab-years__item:focus-visible::before {
    width: 16px;
    left: -26px;
    background: var(--orange);
  }

  .page-about .ab-year {
    padding-right: 38px;
  }

  .page-about .ab-year__side {
    display: block;
    position: absolute;
    right: 0;
    top: 4px;
    writing-mode: vertical-rl;
    font-size: 11px;
    letter-spacing: 0.34em;
    color: var(--ink-soft);
    opacity: 0.62;
  }
}

@media (min-width: 900px) {
  .page-about .ab-opener {
    padding: 28px 0 var(--space-m);
  }

  .page-about .ab-opener__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 56px;
    align-items: end;
  }

  .page-about .ab-routing__grid {
    grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .ab-compliance__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 56px;
    align-items: start;
  }
}
<<<END>>>

.page-about {
  --cat: transparent;
}