.page-about {
  --ab-gap: clamp(20px, 3vw, 40px);
  --ab-card-w: 268px;
  background: var(--paper);
}

/* ============ 首屏 ============ */
.page-about .hero-about {
  position: relative;
  overflow: hidden;
  padding: clamp(88px, 11vw, 140px) 0 clamp(44px, 6vw, 76px);
  background: linear-gradient(168deg, var(--ink) 0%, #0A2647 58%, var(--blue-deep) 100%);
  color: #fff;
}

.page-about .hero-about::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(201, 210, 224, .16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 210, 224, .16) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .5;
  pointer-events: none;
}

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

.page-about .hero-about .crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(28px, 4vw, 48px);
  padding: 0;
}

.page-about .hero-about .crumbs__link,
.page-about .hero-about .crumbs__item {
  font-size: 13px;
  color: rgba(255, 255, 255, .58);
  text-decoration: none;
}

.page-about .hero-about .crumbs__link:hover {
  color: var(--orange);
}

.page-about .hero-about .crumbs__sep {
  color: rgba(255, 255, 255, .3);
}

.page-about .hero-about__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--orange);
}

.page-about .hero-about__title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(40px, 7.4vw, 104px);
  line-height: .98;
  letter-spacing: -.02em;
  max-width: 15ch;
}

.page-about .hero-about__lede {
  margin: clamp(22px, 3.2vw, 34px) 0 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(255, 255, 255, .76);
}

.page-about .hero-about__stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(26px, 5vw, 72px);
  margin: clamp(34px, 5vw, 58px) 0 0;
  padding-top: clamp(22px, 3vw, 30px);
  border-top: 1px solid rgba(255, 255, 255, .16);
}

.page-about .hero-about .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 4.4vw, 52px);
  line-height: 1;
  letter-spacing: -.02em;
  color: #fff;
}

.page-about .hero-about .stat__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: .04em;
  color: rgba(255, 255, 255, .6);
}

.page-about .hero-about__jump {
  display: inline-block;
  margin-top: clamp(30px, 4vw, 44px);
  padding-bottom: 3px;
  font-size: 14px;
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 106, 26, .5);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .hero-about__jump:hover,
.page-about .hero-about__jump:focus-visible {
  color: #fff;
  border-color: #fff;
}

/* ============ 章节骨架 ============ */
.page-about .about-chapter {
  padding: clamp(52px, 7.4vw, 104px) 0;
  border-top: 1px solid var(--grid);
}

.page-about .about-chapter--last {
  border-bottom: 1px solid var(--grid);
}

.page-about .about-chapter .chapter-head {
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .prose {
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .prose p {
  margin: 0 0 1.1em;
}

.page-about .prose p:last-child {
  margin-bottom: 0;
}

/* ============ 01 起点 ============ */
.page-about .origin-layout {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .origin-figure {
  margin: 0;
}

.page-about .origin-figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .media__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel);
}

@media (min-width: 900px) {
  .page-about .origin-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

/* ============ 02 时间轴 ============ */
.page-about .timeline-intro {
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .timeline-scroller {
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 12px;
  border-top: 1px solid var(--grid);
  border-bottom: 1px solid var(--grid);
  background:
    linear-gradient(180deg, rgba(230, 238, 255, .55) 0%, rgba(247, 248, 250, 0) 100%);
}

.page-about .timeline-scroller:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: -2px;
}

.page-about .timeline {
  position: relative;
  display: flex;
  min-width: max-content;
  height: 400px;
  margin: 0;
  padding: 0 32px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 32px;
  right: 32px;
  top: 50%;
  height: 1px;
  background: var(--grid);
}

.page-about .timeline__item {
  position: relative;
  flex: 0 0 auto;
  width: var(--ab-card-w);
  height: 100%;
  scroll-snap-align: start;
}

.page-about .timeline__marker {
  position: absolute;
  left: 22px;
  top: 50%;
  width: 10px;
  height: 10px;
  margin-top: -5px;
  background: var(--blue);
  z-index: 2;
}

.page-about .timeline__item:last-child .timeline__marker {
  background: var(--orange);
}

.page-about .timeline__card {
  position: absolute;
  left: 22px;
  width: 226px;
  padding: 16px 18px 18px;
  background: #fff;
  border: 1px solid var(--grid);
  border-top: 3px solid var(--blue);
  transition: transform .24s var(--ease), border-color .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .timeline__card:hover {
  transform: translateY(-2px);
  border-color: var(--blue);
  box-shadow: 0 6px 18px rgba(11, 18, 32, .07);
}

.page-about .timeline__item:nth-child(odd) .timeline__card {
  bottom: calc(50% + 26px);
}

.page-about .timeline__item:nth-child(even) .timeline__card {
  top: calc(50% + 26px);
  border-top: 1px solid var(--grid);
  border-bottom: 3px solid var(--orange);
}

.page-about .timeline__item:nth-child(odd) .timeline__card::after {
  content: "";
  position: absolute;
  left: 22px;
  bottom: -27px;
  width: 1px;
  height: 27px;
  background: var(--grid);
}

.page-about .timeline__item:nth-child(even) .timeline__card::after {
  content: "";
  position: absolute;
  left: 22px;
  top: -27px;
  width: 1px;
  height: 27px;
  background: var(--grid);
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--blue);
}

.page-about .timeline__item:nth-child(even) .timeline__year {
  color: var(--orange);
}

.page-about .timeline__card h3 {
  margin: 8px 0 8px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--ink);
}

.page-about .timeline__card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--steel);
}

/* ============ 03 流程 ============ */
.page-about .flow-intro {
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .flow-layout {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

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

.page-about .step {
  position: relative;
  padding: 22px 18px 24px 0;
  border-bottom: 1px solid var(--grid);
  transition: background .22s var(--ease), padding-left .22s var(--ease);
}

.page-about .step:hover,
.page-about .step:focus-within {
  background: var(--blue-light);
  padding-left: 14px;
}

.page-about .step__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .step__title {
  margin: 10px 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .step__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .flow-figure {
  margin: 0;
}

.page-about .flow-figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

@media (min-width: 640px) {
  .page-about .steps {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .step:nth-child(odd) {
    border-right: 1px solid var(--grid);
    padding-right: 22px;
  }
  .page-about .step:nth-child(even) {
    padding-left: 22px;
  }
  .page-about .step:nth-child(even):hover {
    padding-left: 32px;
  }
}

@media (min-width: 1000px) {
  .page-about .flow-layout {
    grid-template-columns: minmax(0, 1fr) 320px;
    align-items: start;
  }
}

/* ============ 04 团队 ============ */
.page-about .team-intro {
  margin-bottom: clamp(24px, 3.4vw, 38px);
}

.page-about .team-bar {
  display: flex;
  height: 54px;
  margin: 0 0 14px;
  border: 1px solid var(--grid);
  overflow: hidden;
}

.page-about .team-bar__seg {
  display: block;
  transition: filter .2s var(--ease);
}

.page-about .team-bar:hover .team-bar__seg {
  filter: brightness(1.08);
}

.page-about .team-bar__seg--a { flex: 18 1 0; background: var(--blue); }
.page-about .team-bar__seg--b { flex: 9 1 0; background: var(--blue-deep); }
.page-about .team-bar__seg--c { flex: 5 1 0; background: var(--orange); }

.page-about .team-scale {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 0 0 clamp(26px, 3.6vw, 40px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--steel);
}

.page-about .team-cards {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--grid);
}

.page-about .team-card {
  padding: 22px 20px 24px;
  border-bottom: 1px solid var(--grid);
  transition: background .22s var(--ease);
}

.page-about .team-card:hover {
  background: var(--blue-light);
}

.page-about .team-card__n {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 4vw, 46px);
  line-height: 1;
  color: var(--blue);
}

.page-about .team-card__title {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .team-figure {
  margin: clamp(30px, 4vw, 46px) 0 0;
}

.page-about .team-figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

@media (min-width: 760px) {
  .page-about .team-cards {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .team-card {
    border-right: 1px solid var(--grid);
  }
  .page-about .team-card:last-child {
    border-right: 0;
  }
}

/* ============ 05 长三角 ============ */
.page-about .region-layout {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .region-map {
  position: relative;
  aspect-ratio: 5 / 4;
  background-color: var(--blue-light);
  background-image: radial-gradient(var(--grid) 1.2px, transparent 1.2px);
  background-size: 16px 16px;
  border: 1px solid var(--grid);
}

.page-about .region-map__pin {
  position: absolute;
  width: 11px;
  height: 11px;
  background: var(--blue);
  border: 2px solid #fff;
  transform: translate(-50%, -50%);
}

.page-about .region-map__pin:nth-child(1) { left: 22%; top: 32%; background: var(--orange); }
.page-about .region-map__pin:nth-child(2) { left: 62%; top: 24%; }
.page-about .region-map__pin:nth-child(3) { left: 40%; top: 58%; }
.page-about .region-map__pin:nth-child(4) { left: 10%; top: 52%; }
.page-about .region-map__pin:nth-child(5) { left: 72%; top: 68%; }
.page-about .region-map__pin:nth-child(6) { left: 84%; top: 42%; background: var(--green-deep); }

.page-about .region-map__label {
  position: absolute;
  left: 14px;
  bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--steel);
}

@media (min-width: 900px) {
  .page-about .region-layout {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: center;
  }
}

/* ============ 06 合作 ============ */
.page-about .coop-intro {
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .coop-list {
  display: grid;
  gap: 0;
  margin: 0 0 clamp(30px, 4vw, 48px);
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--grid);
}

.page-about .coop-item {
  padding: 24px 0 26px;
  border-bottom: 1px solid var(--grid);
}

.page-about .coop-item__tag {
  display: inline-block;
}

.page-about .coop-item__title {
  margin: 14px 0 10px;
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .coop-item__desc {
  margin: 0;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .coop-cta {
  padding: clamp(24px, 3.4vw, 36px);
  background: var(--orange-light);
  border-left: 3px solid var(--orange);
}

.page-about .coop-cta__text {
  margin: 0 0 20px;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .coop-cta__text a {
  color: var(--blue);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .coop-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .coop-cta__actions .btn {
  text-decoration: none;
}

@media (min-width: 820px) {
  .page-about .coop-list {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .coop-item {
    padding-right: 26px;
    border-right: 1px solid var(--grid);
  }
  .page-about .coop-item:last-child {
    border-right: 0;
    padding-right: 0;
  }
}

/* ============ 窄屏适配 ============ */
@media (max-width: 719px) {
  .page-about .timeline-scroller {
    overflow-x: visible;
    border-bottom: 0;
    padding-bottom: 0;
  }

  .page-about .timeline {
    flex-direction: column;
    min-width: 0;
    height: auto;
    padding: 0 0 0 26px;
    border-left: 1px solid var(--grid);
  }

  .page-about .timeline::before {
    display: none;
  }

  .page-about .timeline__item {
    width: auto;
    height: auto;
    flex: none;
    margin-bottom: 30px;
    padding-left: 0;
  }

  .page-about .timeline__item:last-child {
    margin-bottom: 0;
  }

  .page-about .timeline__marker {
    left: -31px;
    top: 6px;
    margin-top: 0;
  }

  .page-about .timeline__card,
  .page-about .timeline__item:nth-child(odd) .timeline__card,
  .page-about .timeline__item:nth-child(even) .timeline__card {
    position: static;
    width: 100%;
    border-top: 1px solid var(--grid);
    border-left: 3px solid var(--blue);
  }

  .page-about .timeline__item:nth-child(odd) .timeline__card::after,
  .page-about .timeline__item:nth-child(even) .timeline__card::after {
    display: none;
  }
}

@media (max-width: 640px) {
  .page-about .hero-about__stats {
    gap: 24px;
  }

  .page-about .hero-about .stat {
    min-width: 96px;
  }

  .page-about .step {
    padding-right: 0;
  }

  .page-about .coop-cta__actions .btn {
    width: 100%;
    text-align: center;
  }
}

.page-about .about-chapter .chapter-head {
  scroll-margin-top: calc(var(--rail-h) + 24px);
}
<<<END>>>