.page-about {
  background: var(--deep);
  color: var(--txt);
  overflow-x: hidden;
  font-family: var(--sans);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  padding: calc(var(--header-h) + 40px) 0 56px;
}

.page-about .ab-hero__media {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}

.page-about .ab-hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  filter: saturate(0.85);
}

.page-about .ab-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 80% at 12% 8%, rgba(14, 110, 115, 0.38), transparent 62%),
    linear-gradient(180deg, rgba(7, 26, 43, 0.58) 0%, rgba(7, 26, 43, 0.90) 62%, var(--deep) 100%);
}

.page-about .ab-hero .breadcrumb {
  margin-bottom: 30px;
}

.page-about .ab-hero__title {
  color: var(--mist);
  font-size: clamp(32px, 8.4vw, 68px);
  line-height: 1.06;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 18px 0 22px;
  max-width: 15em;
  text-wrap: balance;
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.9;
  color: var(--txt-dim);
}

.page-about .ab-facts {
  list-style: none;
  margin: 38px 0 0;
  padding: 26px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 26px 16px;
}

.page-about .ab-facts__item {
  position: relative;
  padding-top: 12px;
}

.page-about .ab-facts__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 22px;
  height: 2px;
  background: var(--orange);
}

.page-about .ab-facts__num {
  display: block;
  font-size: clamp(26px, 6vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .ab-facts__label {
  display: block;
  margin-top: 9px;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--silver);
}

/* ---------- 通用区头 ---------- */
.page-about .ab-head {
  max-width: 44em;
  margin-bottom: 36px;
}

.page-about .ab-head__title {
  color: var(--mist);
  font-size: clamp(25px, 5vw, 42px);
  line-height: 1.14;
  font-weight: 800;
  letter-spacing: -0.015em;
  margin: 14px 0 16px;
}

.page-about .ab-head__lede {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--txt-dim);
  max-width: 36em;
}

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

/* ---------- 发展历程 ---------- */
.page-about .ab-journey {
  padding: 72px 0 78px;
  background: linear-gradient(180deg, var(--deep) 0%, #05161f 55%, var(--deep) 100%);
}

.page-about .ab-track {
  display: grid;
  gap: 26px;
}

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

.page-about .ab-track__nav a {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 10px 15px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  text-decoration: none;
  color: var(--silver);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease), background 0.18s var(--ease);
}

.page-about .ab-track__nav a:hover,
.page-about .ab-track__nav a:focus-visible {
  border-color: var(--orange);
  color: var(--mist);
  background: rgba(255, 106, 42, 0.08);
}

.page-about .ab-node__year {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .ab-node__label {
  font-size: 12.5px;
  white-space: nowrap;
}

.page-about .ab-phases {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .ab-phase {
  position: relative;
  padding: 24px 20px 24px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: linear-gradient(152deg, rgba(18, 52, 77, 0.88), rgba(7, 26, 43, 0.92));
  scroll-margin-top: calc(var(--header-h) + 24px);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .ab-phase::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  bottom: 24px;
  width: 2px;
  border-radius: 2px;
  background: var(--teal);
  transition: background 0.2s var(--ease);
}

.page-about .ab-phase:target {
  border-color: rgba(255, 106, 42, 0.55);
  transform: translateX(2px);
}

.page-about .ab-phase:target::before {
  background: var(--orange);
}

.page-about .ab-phase__year {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--tide);
}

.page-about .ab-phase__title {
  margin: 9px 0 10px;
  font-size: 19px;
  line-height: 1.35;
  font-weight: 700;
  color: var(--mist);
}

.page-about .ab-phase__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--txt-dim);
}

.page-about .ab-phase__result {
  display: inline-block;
  margin-top: 16px;
  padding: 6px 13px;
  border-radius: 999px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--orange-soft);
  background: rgba(255, 106, 42, 0.12);
  border: 1px solid rgba(255, 106, 42, 0.28);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  padding: 74px 0;
  background: var(--deep);
}

.page-about .ab-team__sum {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
  padding: 22px 0 26px;
  margin-bottom: 30px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-team__num {
  font-size: clamp(38px, 10vw, 62px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--orange);
}

.page-about .ab-team__sumtext {
  flex: 1 1 240px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--txt-dim);
  padding-top: 4px;
}

.page-about .ab-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .ab-role {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 20px;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: rgba(18, 52, 77, 0.42);
  transition: border-color 0.2s var(--ease);
}

.page-about .ab-role:hover {
  border-color: rgba(95, 199, 201, 0.42);
}

.page-about .ab-role__unit {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--silver);
}

.page-about .ab-role__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .ab-role__name {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .ab-role__num {
  flex: 0 0 auto;
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--tide);
}

.page-about .ab-role__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--txt-dim);
}

/* ---------- 内容生产 ---------- */
.page-about .ab-flow {
  padding: 74px 0;
  background: #05161f;
}

.page-about .ab-flow__grid {
  display: grid;
  gap: 34px;
}

.page-about .ab-flow__aside .ab-head__title,
.page-about .ab-flow__aside .ab-head__lede {
  max-width: 30em;
}

.page-about .ab-flow__figure {
  margin: 26px 0 0;
}

.page-about .ab-flow__media {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--ink);
}

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

.page-about .ab-flow__cap {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  padding: 20px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-step:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-step__idx {
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .ab-step__title {
  margin: 0 0 7px;
  font-size: 16px;
  font-weight: 700;
  color: var(--mist);
}

.page-about .ab-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--txt-dim);
}

/* ---------- 版本与服务半径 ---------- */
.page-about .ab-reach {
  padding: 74px 0;
  background: var(--deep);
}

.page-about .ab-reach__grid {
  display: grid;
  gap: 32px;
}

.page-about .ab-reach__copy .ab-head__lede {
  max-width: 34em;
}

.page-about .ab-cities {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .ab-cities li {
  font-size: 12.5px;
  padding: 5px 13px;
  border-radius: 999px;
  border: 1px solid var(--line-soft);
  color: var(--txt-dim);
}

.page-about .ab-reach__panel {
  position: relative;
  overflow: hidden;
  padding: 28px 22px 30px;
  border-radius: 26px;
  border: 1px solid var(--line);
  background: linear-gradient(156deg, rgba(14, 110, 115, 0.26), rgba(7, 26, 43, 0.66) 52%, rgba(2, 7, 12, 0.86));
}

.page-about .ab-reach__panel::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -50px;
  width: 190px;
  height: 190px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 106, 42, 0.22), transparent 68%);
  pointer-events: none;
}

.page-about .ab-reach__svg {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: 26px;
  opacity: 0.9;
}

.page-about .ab-reach__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 16px;
}

.page-about .ab-stat__num {
  display: block;
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--tide);
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--silver);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners {
  padding: 74px 0;
  background: #05161f;
}

.page-about .ab-partners__grid {
  display: grid;
  gap: 32px;
}

.page-about .ab-partners__copy .ab-head__lede {
  max-width: 34em;
}

.page-about .ab-honors {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 26px;
}

.page-about .ab-honor {
  padding: 18px 16px;
  border-radius: 14px;
  border: 1px solid var(--line-soft);
  background: rgba(18, 52, 77, 0.38);
}

.page-about .ab-honor__num {
  display: block;
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .ab-honor__label {
  display: block;
  margin-top: 9px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--silver);
}

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

.page-about .ab-partners__media {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--ink);
}

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

.page-about .ab-partners__cap {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--silver);
}

/* ---------- 工作方式 ---------- */
.page-about .ab-principles {
  padding: 74px 0;
  background: var(--deep);
}

.page-about .ab-principles__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .ab-principle {
  position: relative;
  padding: 22px 20px 22px 26px;
  border-radius: 16px;
  border: 1px solid var(--line-soft);
  background: linear-gradient(140deg, rgba(18, 52, 77, 0.55), rgba(7, 26, 43, 0.75));
}

.page-about .ab-principle::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 24px;
  bottom: 24px;
  width: 3px;
  border-radius: 3px;
  background: var(--teal);
  opacity: 0.7;
}

.page-about .ab-principle__idx {
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .ab-principle__title {
  margin: 8px 0 8px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--mist);
  line-height: 1.4;
}

.page-about .ab-principle__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--txt-dim);
}

/* ---------- 下一步 ---------- */
.page-about .ab-next {
  padding: 66px 0 82px;
  background: linear-gradient(180deg, var(--deep) 0%, var(--night) 100%);
}

.page-about .ab-next__head {
  max-width: 42em;
}

.page-about .ab-next__links {
  display: grid;
  gap: 14px;
  margin-top: 30px;
}

.page-about .ab-linkcard {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px 18px;
  border-radius: 16px;
  border: 1px solid var(--line-soft);
  background: rgba(18, 52, 77, 0.34);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .ab-linkcard:hover,
.page-about .ab-linkcard:focus-visible {
  border-color: rgba(255, 106, 42, 0.55);
  background: rgba(18, 52, 77, 0.62);
  transform: translateY(-2px);
}

.page-about .ab-linkcard__idx {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .ab-linkcard__body {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
  flex: 1 1 auto;
}

.page-about .ab-linkcard__title {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--mist);
}

.page-about .ab-linkcard__text {
  font-size: 13px;
  line-height: 1.6;
  color: var(--txt-dim);
}

.page-about .ab-linkcard__arrow {
  flex: 0 0 auto;
  font-size: 17px;
  color: var(--silver);
  transition: transform 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .ab-linkcard:hover .ab-linkcard__arrow,
.page-about .ab-linkcard:focus-visible .ab-linkcard__arrow {
  transform: translateX(3px);
  color: var(--orange);
}

/* ---------- 焦点可见 ---------- */
.page-about .ab-linkcard:focus-visible,
.page-about .ab-track__nav a:focus-visible {
  outline: 2px solid var(--tide);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-phases {
    gap: 22px;
  }

  .page-about .ab-phase {
    padding: 28px 26px 28px 28px;
  }

  .page-about .ab-phase__title {
    font-size: 20px;
  }

  .page-about .ab-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: calc(var(--header-h) + 64px) 0 84px;
  }

  .page-about .ab-hero__lede {
    font-size: 17px;
  }

  .page-about .ab-journey,
  .page-about .ab-team,
  .page-about .ab-flow,
  .page-about .ab-reach,
  .page-about .ab-partners,
  .page-about .ab-principles {
    padding: 96px 0;
  }

  .page-about .ab-head {
    margin-bottom: 46px;
  }

  .page-about .ab-track {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .ab-track__nav {
    position: sticky;
    top: calc(var(--header-h) + 32px);
    flex-direction: column;
    gap: 28px;
    overflow: visible;
    padding: 4px 0 4px 24px;
    border-left: 1px solid var(--line);
  }

  .page-about .ab-track__nav a {
    padding: 0;
    border: 0;
    border-radius: 0;
    background: none;
    position: relative;
  }

  .page-about .ab-track__nav a::before {
    content: "";
    position: absolute;
    left: -29px;
    top: 5px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--ink);
    border: 1px solid var(--line);
    transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
  }

  .page-about .ab-track__nav a:hover::before,
  .page-about .ab-track__nav a:focus-visible::before {
    background: var(--orange);
    border-color: var(--orange);
  }

  .page-about .ab-node__year {
    font-size: 14px;
  }

  .page-about .ab-node__label {
    font-size: 13.5px;
  }

  .page-about .ab-phase:nth-child(even) {
    margin-inline-start: 46px;
  }

  .page-about .ab-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
    padding-bottom: 30px;
  }

  .page-about .ab-role:nth-child(2),
  .page-about .ab-role:nth-child(4) {
    transform: translateY(26px);
  }

  .page-about .ab-flow__grid {
    grid-template-columns: 5fr 7fr;
    gap: 52px;
    align-items: start;
  }

  .page-about .ab-reach__grid {
    grid-template-columns: 7fr 5fr;
    gap: 52px;
    align-items: start;
  }

  .page-about .ab-partners__grid {
    grid-template-columns: 7fr 5fr;
    gap: 54px;
    align-items: start;
  }

  .page-about .ab-principles__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .ab-next {
    padding: 84px 0 100px;
  }

  .page-about .ab-linkcard {
    padding: 24px 22px;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero__title {
    max-width: 14em;
  }

  .page-about .ab-reach__panel {
    padding: 34px 30px 36px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-phase,
  .page-about .ab-role,
  .page-about .ab-linkcard,
  .page-about .ab-track__nav a {
    transition: none;
  }

  .page-about .ab-phase:target,
  .page-about .ab-linkcard:hover,
  .page-about .ab-linkcard:focus-visible {
    transform: none;
  }

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