.page-about {
  position: relative;
  display: block;
  padding: 22px 16px 88px;
  font-family: var(--font-body);
  color: var(--mist);
  overflow-x: hidden;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  font-size: 13px;
  color: var(--steel);
}

.page-about .breadcrumb a {
  color: var(--steel);
  text-decoration: none;
  transition: color .25s var(--ease);
}

.page-about .breadcrumb a:hover {
  color: var(--signal);
}

.page-about .breadcrumb__sep {
  color: var(--hair);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  gap: 30px;
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--signal);
}

.page-about h1 {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 7.6vw, 54px);
  line-height: 1.14;
  letter-spacing: -.5px;
  max-width: 14em;
}

.page-about .about-hero__lede {
  margin: 0 0 14px;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-hero__fig {
  position: relative;
  border: 1px solid var(--hair);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--indigo);
}

.page-about .about-hero__fig img {
  width: 100%;
  object-fit: cover;
  filter: saturate(.9) brightness(.86);
}

.page-about .about-hero__fig::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 16, 38, 0) 45%, rgba(10, 16, 38, .82) 100%);
  pointer-events: none;
}

.page-about .about-hero__fig .figure__cap {
  position: relative;
  z-index: 1;
}

.page-about .figure__cap {
  margin: 0;
  padding: 14px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel);
  background: var(--indigo-deep);
}

.page-about .figure__cap strong {
  color: var(--mist);
  font-weight: 700;
}

/* ---------- 斜向引导线 ---------- */

.page-about .about-guide {
  display: block;
  position: relative;
  height: 1px;
  width: min(100%, 640px);
  margin: 40px 0 4px;
  background: linear-gradient(90deg, var(--signal), var(--hair));
  transform: rotate(-2.4deg);
  transform-origin: left center;
}

.page-about .about-guide::after {
  content: "";
  position: absolute;
  right: -1px;
  top: -3px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 14px rgba(255, 90, 31, .75);
}

/* ---------- 章节通用 ---------- */

.page-about .about-block {
  margin-top: 68px;
}

.page-about .about-block__intro {
  margin: -8px 0 26px;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .band {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}

.page-about .band__no {
  flex: none;
  padding: 5px 11px;
  border-radius: var(--pill);
  background: var(--signal);
  color: var(--night);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
}

.page-about .band__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(21px, 4.8vw, 30px);
  letter-spacing: -.4px;
  line-height: 1.25;
}

.page-about .band__rule {
  flex: 1;
  min-width: 24px;
  height: 1px;
  background: linear-gradient(90deg, var(--hair), rgba(255, 255, 255, 0));
}

/* ---------- 时间轴 ---------- */

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 16px;
  bottom: 16px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--signal), var(--teal) 58%, var(--wine));
  opacity: .55;
}

.page-about .tl-item {
  position: relative;
  padding-left: 40px;
  margin-bottom: 12px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 20px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--night);
  border: 2px solid var(--signal);
  z-index: 1;
}

.page-about .tl-node {
  border: 1px solid var(--hair);
  border-radius: var(--r-md);
  background: var(--indigo);
  overflow: hidden;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .tl-node[open] {
  border-color: rgba(255, 90, 31, .48);
  background: var(--indigo-deep);
}

.page-about .tl-sum {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl-sum::-webkit-details-marker {
  display: none;
}

.page-about .tl-sum:hover .tl-name {
  color: var(--signal-soft);
}

.page-about .tl-i {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--signal);
}

.page-about .tl-name {
  flex: 1;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: -.2px;
  transition: color .25s var(--ease);
}

.page-about .tl-cue {
  flex: none;
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--steel);
  border-bottom: 2px solid var(--steel);
  transform: rotate(45deg);
  transition: transform .3s var(--ease), border-color .25s var(--ease);
}

.page-about .tl-node[open] .tl-cue {
  transform: rotate(-135deg);
  border-color: var(--signal);
}

.page-about .tl-panel {
  padding: 0 16px 18px;
}

.page-about .tl-panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--steel);
}

/* ---------- 团队 ---------- */

.page-about .team-split {
  display: grid;
  gap: 26px;
}

.page-about .team-split__fig {
  border: 1px solid var(--hair);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--indigo);
}

.page-about .team-split__fig img {
  width: 100%;
  object-fit: cover;
  filter: saturate(.85) brightness(.9);
}

.page-about .team-split__intro {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel);
}

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

.page-about .coord {
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: 14px;
  align-items: start;
  padding: 15px 2px;
  border-top: 1px solid var(--hair-soft);
}

.page-about .coord:last-child {
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .coord__no {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: .04em;
  color: var(--teal);
}

.page-about .coord__body strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: -.2px;
  color: var(--mist);
}

.page-about .coord__body span {
  font-size: 14px;
  line-height: 1.72;
  color: var(--steel);
}

/* ---------- 复核窗口 ---------- */

.page-about .review-grid {
  display: grid;
  gap: 24px;
}

.page-about .review-slab {
  border-radius: var(--r-lg);
  padding: 26px 22px;
}

.page-about .review-slab__stamp {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: clamp(26px, 6vw, 36px);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--amber);
}

.page-about .review-slab__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .review-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .review-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .review-item:first-child {
  border-top: 1px solid var(--hair-soft);
}

.page-about .review-item h3 {
  margin: 0 0 7px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -.2px;
  color: var(--mist);
}

.page-about .review-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .review-item a {
  color: var(--signal-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 112, 56, .4);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .review-item a:hover {
  color: var(--amber);
  border-color: var(--amber);
}

/* ---------- 白皮书与协作 ---------- */

.page-about .books-grid {
  display: grid;
  gap: 28px;
}

.page-about .prose {
  margin: 0 0 26px;
  max-width: 38em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--steel);
}

.page-about .partner-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .partner {
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: var(--indigo);
  border: 1px solid var(--hair);
}

.page-about .partner__kind {
  display: inline-flex;
  margin-bottom: 10px;
}

.page-about .partner p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--steel);
}

.page-about .books-fig {
  border: 1px solid var(--hair);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--wine);
}

.page-about .books-fig img {
  width: 100%;
  object-fit: cover;
  filter: saturate(.8) brightness(.88);
}

/* ---------- 原则与统计 ---------- */

.page-about .principles {
  display: grid;
  gap: 14px;
}

.page-about .principle {
  position: relative;
  padding: 20px 20px 20px 24px;
  border-radius: var(--r-md);
  background: linear-gradient(135deg, var(--indigo), var(--indigo-deep));
  border: 1px solid var(--hair);
}

.page-about .principle::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  bottom: 22px;
  width: 3px;
  border-radius: 3px;
  background: var(--signal);
}

.page-about .principle h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -.2px;
  color: var(--mist);
}

.page-about .principle p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--steel);
}

.page-about .stat-band {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin-top: 32px;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--hair-soft);
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 18px;
  background: var(--indigo-deep);
}

.page-about .stat__n {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--signal);
}

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

/* ---------- 收束 ---------- */

.page-about .about-cta {
  margin-top: 44px;
  padding: 26px 22px;
  border-radius: var(--r-lg);
  border: 1px solid var(--hair);
  background: linear-gradient(140deg, rgba(255, 90, 31, .16), rgba(20, 180, 140, .1) 70%, rgba(10, 16, 38, 0));
}

.page-about .about-cta__text {
  margin: 0 0 18px;
  max-width: 38em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about {
    padding: 30px 32px 104px;
  }

  .page-about .about-block {
    margin-top: 84px;
  }

  .page-about .team-split {
    grid-template-columns: 1.02fr 1fr;
    align-items: start;
    gap: 32px;
  }

  .page-about .review-grid {
    grid-template-columns: .82fr 1.18fr;
    gap: 32px;
  }

  .page-about .books-grid {
    grid-template-columns: 1.25fr .75fr;
    align-items: start;
    gap: 34px;
  }

  .page-about .principles {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

  .page-about .stat-band {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 26px;
    padding: 32px 30px;
  }

  .page-about .about-cta__text {
    margin: 0;
    flex: 1;
  }
}

@media (min-width: 1040px) {
  .page-about {
    padding: 44px 48px 128px;
  }

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

  .page-about .timeline {
    padding-left: 8px;
  }

  .page-about .tl-name {
    font-size: 17px;
  }

  .page-about .coord__no {
    font-size: 25px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-guide {
    transform: none;
  }

  .page-about .tl-node,
  .page-about .tl-name,
  .page-about .tl-cue {
    transition: none;
  }
}
<<<END>>>
</main>