.page-about {
  --ab-gap: clamp(1.5rem, 3.5vw, 3rem);
  --ab-space: clamp(3rem, 7vw, 5.5rem);
  display: block;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  padding-bottom: var(--ab-space);
}

.page-about .ab-inner {
  width: var(--shell);
  margin-inline: auto;
}

.page-about .ab-inner + .ab-inner {
  margin-top: var(--ab-space);
}

.page-about .breadcrumb {
  padding-top: clamp(1rem, 2.4vw, 1.6rem);
}

.page-about .ab-section {
  scroll-margin-top: 6rem;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  display: grid;
  gap: var(--ab-gap);
  align-items: start;
  padding-block: clamp(1.5rem, 3.5vw, 2.5rem) clamp(0.5rem, 1.5vw, 1rem);
}

.page-about .ab-hero__eyebrow {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--crimson);
}

.page-about .ab-hero__title {
  margin: 0 0 1.1rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.9rem, 5.4vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -0.012em;
}

.page-about .ab-hero__intro {
  margin: 0;
  max-width: 42rem;
  font-size: clamp(1rem, 1.1vw, 1.0625rem);
  color: var(--slate);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.85rem;
}

.page-about .ab-facts {
  position: relative;
  background: var(--ink);
  color: var(--cream);
  padding: clamp(1.75rem, 3.6vw, 2.5rem) clamp(1.25rem, 3vw, 2rem) clamp(1.25rem, 3vw, 1.75rem);
  border: 1px solid var(--ink);
  align-self: start;
}

.page-about .ab-facts::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background: linear-gradient(
    90deg,
    var(--crimson) 0 20%,
    var(--indigo) 20% 40%,
    var(--gold) 40% 60%,
    var(--jade) 60% 80%,
    var(--slate) 80% 100%
  );
}

.page-about .ab-facts__label {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

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

.page-about .ab-facts__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid rgba(183, 169, 154, 0.24);
}

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

.page-about .ab-facts__key {
  font-size: 0.875rem;
  color: rgba(247, 244, 239, 0.7);
}

.page-about .ab-facts__val {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  line-height: 1;
  color: var(--cream);
}

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

/* ---------- 章节头 ---------- */

.page-about .ab-head {
  border-top: 1px solid var(--ink);
  padding-top: 0.9rem;
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .ab-head__idx {
  margin: 0 0 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--crimson);
}

.page-about .ab-head h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1.2;
  letter-spacing: -0.005em;
}

.page-about .ab-lede {
  margin: 0 0 clamp(1.25rem, 3vw, 2rem);
  max-width: 46rem;
  color: var(--slate);
}

/* ---------- 起源 ---------- */

.page-about .ab-origin {
  display: grid;
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .ab-origin__text p {
  margin: 0 0 1rem;
  color: var(--slate);
}

.page-about .ab-origin__text p:first-child {
  color: var(--ink);
}

.page-about .ab-origin__text p:last-child {
  margin-bottom: 0;
  padding-left: 1rem;
  border-left: 3px solid var(--crimson);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.05rem, 1.9vw, 1.25rem);
  line-height: 1.55;
  color: var(--ink);
}

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

.page-about .ab-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.78) contrast(1.06);
}

.page-about .ab-figure figcaption {
  margin-top: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--slate);
  border-left: 2px solid var(--line);
  padding-left: 0.6rem;
}

/* ---------- 时间线 ---------- */

.page-about .ab-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.75rem;
  border-left: 1px solid var(--line);
}

.page-about .ab-tl__item {
  position: relative;
  padding-bottom: clamp(1.5rem, 3.5vw, 2.25rem);
}

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

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -1.75rem;
  margin-left: -5px;
  top: 0.6rem;
  width: 10px;
  height: 10px;
  background: var(--crimson);
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ab-tl__item:hover::before,
.page-about .ab-tl__item:focus-within::before {
  background: var(--jade);
  transform: scale(1.25);
}

.page-about .ab-tl__item:focus-visible {
  outline: 2px solid var(--jade);
  outline-offset: 4px;
}

.page-about .ab-tl__tag {
  margin: 0 0 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--indigo);
}

.page-about .ab-tl__title {
  margin: 0 0 0.4rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  line-height: 1.3;
}

.page-about .ab-tl__desc {
  margin: 0;
  color: var(--slate);
}

.page-about .ab-tl__more {
  display: grid;
  grid-template-rows: 1fr;
}

.page-about .ab-tl__more > div {
  overflow: hidden;
}

.page-about .ab-tl__more p {
  margin: 0.6rem 0 0;
  padding-left: 0.75rem;
  border-left: 2px solid var(--gold);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--slate);
}

@media (hover: hover) {
  .page-about .ab-tl__more {
    grid-template-rows: 0fr;
    transition: grid-template-rows var(--dur) var(--ease);
  }

  .page-about .ab-tl__item:hover .ab-tl__more,
  .page-about .ab-tl__item:focus-within .ab-tl__more {
    grid-template-rows: 1fr;
  }
}

/* ---------- 团队 ---------- */

.page-about .ab-team {
  display: grid;
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .ab-team__main p {
  margin: 0 0 1rem;
  color: var(--slate);
}

.page-about .ab-team__main p:first-child {
  color: var(--ink);
}

.page-about .ab-team__photo {
  margin-top: clamp(1.25rem, 3vw, 2rem);
}

.page-about .ab-team__rail {
  display: grid;
  gap: 0.75rem;
}

.page-about .ab-stat {
  background: var(--cream);
  border-left: 3px solid var(--crimson);
  padding: 0.95rem 1.1rem;
}

.page-about .ab-stat--indigo {
  border-left-color: var(--indigo);
}

.page-about .ab-stat--gold {
  border-left-color: var(--gold);
}

.page-about .ab-stat--jade {
  border-left-color: var(--jade);
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.75rem;
  line-height: 1.05;
  color: var(--ink);
  margin-bottom: 0.25rem;
}

.page-about .ab-stat__label {
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--slate);
}

/* ---------- 合作生态 ---------- */

.page-about .ab-pgrid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .ab-pcard {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  background: var(--cream);
  padding: clamp(1.25rem, 2.6vw, 1.9rem);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

@media (hover: hover) {
  .page-about .ab-pcard:hover {
    background: var(--paper);
    box-shadow: inset 3px 0 0 var(--crimson);
  }
}

.page-about .ab-pcard__count {
  margin: 0;
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  padding: 0.2rem 0.55rem;
  background: var(--gold);
  color: var(--ink);
}

.page-about .ab-pcard__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.1rem, 1.9vw, 1.3rem);
  line-height: 1.3;
}

.page-about .ab-pcard__desc {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--slate);
}

.page-about .ab-pcard__fields {
  list-style: none;
  margin: 0.2rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.4rem;
  opacity: 0.7;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

@media (hover: hover) {
  .page-about .ab-pcard__fields {
    transform: translateY(4px);
  }

  .page-about .ab-pcard:hover .ab-pcard__fields {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-about .ab-pcard__fields li {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--indigo);
  border-top: 1px solid rgba(183, 169, 154, 0.6);
  padding-top: 0.4rem;
}

.page-about .ab-partners__media {
  margin-top: clamp(1.5rem, 3vw, 2.25rem);
}

/* ---------- 服务区域 ---------- */

.page-about .ab-regions {
  display: grid;
  gap: var(--ab-gap);
  align-items: start;
}

.page-about .ab-regions__figures {
  display: grid;
  gap: 1.25rem;
}

.page-about .ab-figstat {
  border-top: 3px solid var(--crimson);
  padding-top: 0.75rem;
}

.page-about .ab-figstat--jade {
  border-top-color: var(--jade);
}

.page-about .ab-figstat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.75rem, 7vw, 4.25rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.page-about .ab-figstat__label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .ab-regions__note {
  margin: 0;
  padding: 0.85rem 1rem;
  background: var(--ink);
  color: var(--cream);
  font-size: 0.875rem;
  line-height: 1.7;
}

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

.page-about .ab-scene {
  background: var(--cream);
  padding: clamp(1rem, 2.2vw, 1.4rem);
}

.page-about .ab-scene h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1rem;
  line-height: 1.4;
}

.page-about .ab-scene p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 结尾 ---------- */

.page-about .ab-cta {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--cream);
  padding: clamp(2rem, 5vw, 3.5rem) clamp(1.25rem, 4vw, 3rem) clamp(2.5rem, 5.5vw, 4rem);
}

.page-about .ab-cta::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 5px;
  background: linear-gradient(
    90deg,
    var(--jade) 0 25%,
    var(--gold) 25% 50%,
    var(--indigo) 50% 75%,
    var(--crimson) 75% 100%
  );
}

.page-about .ab-cta h2 {
  margin: 0 0 0.9rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.4rem, 3.2vw, 2.1rem);
  line-height: 1.25;
  color: var(--cream);
}

.page-about .ab-cta p {
  margin: 0;
  max-width: 44rem;
  color: rgba(247, 244, 239, 0.76);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .ab-cta .btn--ghost {
  border-color: rgba(247, 244, 239, 0.5);
  color: var(--cream);
}

@media (hover: hover) {
  .page-about .ab-cta .btn--ghost:hover {
    border-color: var(--jade);
    color: var(--jade);
  }
}

/* ---------- 断点 ---------- */

@media (min-width: 720px) {
  .page-about .ab-scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .ab-pgrid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .ab-origin {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    column-gap: clamp(2rem, 4.5vw, 3.5rem);
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    column-gap: clamp(2rem, 5vw, 3.5rem);
  }

  .page-about .ab-team__rail {
    position: sticky;
    top: 5.5rem;
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .ab-regions {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    column-gap: clamp(2rem, 4.5vw, 3.5rem);
  }
}

@media (min-width: 1100px) {
  .page-about .ab-regions__figures {
    position: sticky;
    top: 5.5rem;
  }
}

@media (max-width: 520px) {
  .page-about .ab-tl {
    padding-left: 1.25rem;
  }

  .page-about .ab-tl__item::before {
    left: -1.25rem;
  }

  .page-about .ab-hero__actions .btn,
  .page-about .ab-cta__actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-pcard,
  .page-about .ab-pcard__fields,
  .page-about .ab-tl__item::before,
  .page-about .ab-tl__more {
    transition: none;
  }
}
<<<END>>>