.page-about {
  --about-rail: 152px;
  --about-cut: 20px;
  background: var(--paper);
  color: var(--ink-deep);
  overflow-x: clip;
}

.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 顶部上下文 ---------- */
.page-about .about-topbar {
  padding: 14px 0 0;
}

.page-about .about-topbar .breadcrumb {
  font-size: 13px;
}

/* ---------- 框景首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: 14px;
  padding: clamp(28px, 6vw, 64px) 0 clamp(34px, 6vw, 76px);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(22, 74, 110, .92), transparent 62%),
    linear-gradient(158deg, var(--blue-cabin), var(--ink-deep) 64%);
  color: var(--white);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 40px), calc(100% - 40px) 100%, 0 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--orange), rgba(47, 230, 214, .7) 42%, transparent 82%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: var(--gutter);
  top: 0;
  bottom: 0;
  width: 1px;
  background: repeating-linear-gradient(180deg, rgba(159, 178, 196, .32) 0 1px, transparent 1px 14px);
  pointer-events: none;
}

.page-about .about-hero-inner {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  position: relative;
  z-index: 1;
}

.page-about .about-hero-copy .eyebrow {
  color: var(--cyan);
  letter-spacing: .14em;
  font-size: 12px;
  margin: 0 0 14px;
}

.page-about .about-hero-copy h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(30px, 5.4vw, 54px);
  line-height: 1.1;
  letter-spacing: -.01em;
  max-width: 20ch;
}

.page-about .about-hero-copy .lede {
  margin: 18px 0 0;
  max-width: 48ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
  color: rgba(232, 237, 242, .8);
}

.page-about .about-hero-stats {
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
  padding-top: 20px;
  border-top: 1px solid rgba(159, 178, 196, .22);
}

.page-about .hs {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .hs-num {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 600;
  color: var(--orange);
  line-height: 1;
}

.page-about .hs-label {
  font-size: 13px;
  color: rgba(232, 237, 242, .72);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 0;
}

.page-about .about-hero-plate {
  position: relative;
  margin: 0;
}

.page-about .about-hero-plate img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}

.page-about .about-hero-plate::after {
  content: "";
  position: absolute;
  inset: -8px -8px 8px 8px;
  border-top: 1px solid rgba(47, 230, 214, .5);
  border-left: 1px solid rgba(47, 230, 214, .5);
  pointer-events: none;
}

.page-about .about-hero-plate figcaption {
  margin-top: 12px;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--steel);
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  padding: clamp(38px, 6vw, 80px) 0;
}

.page-about .chapter + .chapter {
  border-top: 1px solid var(--line);
}

.page-about .chapter-inner {
  display: grid;
  gap: 16px;
}

.page-about .chapter-rail {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .rail-num {
  font-size: 26px;
  font-weight: 600;
  color: var(--orange);
  line-height: 1;
}

.page-about .rail-label {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--blue-harbor);
}

.page-about .chapter-body h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.22;
  letter-spacing: -.01em;
  max-width: 26ch;
}

.page-about .chapter-body .prose {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-80);
  max-width: 62ch;
}

.page-about .chapter-body .prose:last-of-type {
  margin-bottom: 0;
}

/* ---------- 坐标信息面板 ---------- */
.page-about .chapter-panel {
  margin-top: 24px;
  padding: clamp(18px, 3vw, 28px);
  background: var(--white);
  border: 1px solid var(--line);
  box-shadow: 0 18px 34px -30px rgba(6, 21, 35, .8);
}

.page-about .coord-list {
  margin: 0;
  display: grid;
  gap: 16px 22px;
}

.page-about .coord-list dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--blue-harbor);
  text-transform: uppercase;
}

.page-about .coord-list dd {
  margin: 5px 0 0;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink-deep);
}

/* ---------- 原则卡片 ---------- */
.page-about .principle-grid {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .principle {
  position: relative;
  padding: 24px 20px 22px;
  background: var(--blue-cabin);
  color: var(--white);
  clip-path: polygon(0 0, calc(100% - var(--about-cut)) 0, 100% var(--about-cut), 100% 100%, 0 100%);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .principle:hover,
.page-about .principle:focus-within {
  transform: translateY(-5px);
  background: var(--blue-harbor);
}

.page-about .principle-num {
  display: inline-block;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--cyan);
  margin-bottom: 12px;
}

.page-about .principle-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: .01em;
}

.page-about .principle-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(232, 237, 242, .78);
}

/* ---------- 团队图与流程刻度 ---------- */
.page-about .about-team-figure {
  margin: 26px 0 0;
  background: var(--blue-harbor);
}

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

.page-about .about-team-figure figcaption,
.page-about .about-partner-figure figcaption {
  padding: 10px 12px;
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--steel);
}

.page-about .steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .step {
  position: relative;
  padding: 22px 14px 20px 0;
  border-top: 2px solid var(--line);
}

.page-about .step::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--orange);
}

.page-about .step-num {
  display: block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--blue-harbor);
  margin-bottom: 6px;
}

.page-about .step-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
}

.page-about .step-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-70);
}

/* ---------- 版本时间线 ---------- */
.page-about .timeline {
  list-style: none;
  position: relative;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 25px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange), rgba(255, 107, 44, .14));
}

.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-about .tl-ver {
  position: relative;
  z-index: 1;
  padding: 7px 0;
  text-align: center;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--white);
  background: var(--blue-cabin);
  clip-path: polygon(0 0, 100% 0, 100% 74%, 86% 100%, 0 100%);
}

.page-about .tl-item.is-current .tl-ver {
  background: var(--orange);
}

.page-about .tl-card {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 14px 16px;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl-item:hover .tl-card,
.page-about .tl-item:focus-within .tl-card {
  transform: translateX(4px);
  border-color: var(--orange);
  box-shadow: 0 16px 28px -24px rgba(6, 21, 35, .9);
}

.page-about .tl-item.is-current .tl-card {
  border-left: 3px solid var(--orange);
}

.page-about .tl-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
}

.page-about .tl-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-70);
}

.page-about .tl-note {
  margin: 8px 0 0;
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--steel);
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-split {
  display: grid;
  gap: 22px;
  margin-top: 6px;
}

.page-about .about-partner-figure {
  margin: 0;
  background: var(--blue-cabin);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

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

.page-about .tag-title {
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .16em;
  color: var(--blue-harbor);
  text-transform: uppercase;
}

.page-about .tag-wall {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 12px 0 0;
  padding: 0;
}

.page-about .tag-wall li {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 6px 11px;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--blue-harbor);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .tag-wall li:hover {
  border-color: var(--orange);
  color: var(--orange-deep);
}

/* ---------- 服务索引 ---------- */
.page-about .chapter--index {
  background: linear-gradient(180deg, rgba(232, 237, 242, 0) 0%, rgba(11, 42, 69, .06) 100%);
}

.page-about .index-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .index-list li {
  border-bottom: 1px solid var(--line);
}

.page-about .index-link {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 16px 4px;
  text-decoration: none;
  color: inherit;
  transition: background var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.page-about .index-link:hover,
.page-about .index-link:focus-visible {
  background: var(--white);
  padding-left: 12px;
}

.page-about .index-num {
  font-size: 12px;
  color: var(--orange);
  letter-spacing: .1em;
}

.page-about .index-title {
  display: block;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  line-height: 1.3;
}

.page-about .index-desc {
  display: block;
  margin-top: 4px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.65;
  color: var(--ink-70);
}

.page-about .index-arrow {
  font-size: 15px;
  color: var(--blue-harbor);
  transition: transform var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .index-link:hover .index-arrow {
  transform: translateX(4px);
  color: var(--orange);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-hero-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .hs {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

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

  .page-about .index-link {
    grid-template-columns: 52px minmax(0, 1fr) auto;
    gap: 16px;
    padding: 20px 6px;
  }
}

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

  .page-about .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: 22px;
  }

  .page-about .step {
    padding-right: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .chapter-inner {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }

  .page-about .chapter-rail {
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .page-about .rail-num {
    font-size: 34px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(22px, 3vw, 38px);
    align-items: start;
  }

  .page-about .about-team-figure {
    margin-top: 30px;
  }

  .page-about .timeline::before {
    left: 25px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .principle,
  .page-about .tl-card,
  .page-about .index-link,
  .page-about .index-arrow {
    transition: none;
  }

  .page-about .principle:hover,
  .page-about .principle:focus-within,
  .page-about .tl-item:hover .tl-card,
  .page-about .tl-item:focus-within .tl-card,
  .page-about .index-link:hover .index-arrow {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>