.page-about {
  --rail-w: 96px;
  background: var(--ink);
  color: var(--cream);
  font-family: var(--font-body);
}

.page-about .about-shell {
  display: block;
}

.page-about .about-rail {
  display: none;
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .rail-link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 4px 0 4px 10px;
  border-left: 1px solid var(--line);
  text-decoration: none;
  color: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .rail-num {
  color: var(--moss);
  font-size: 11px;
}

.page-about .rail-link:hover .rail-num { color: var(--cyan); }

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(26px, 5vw, 52px) 0 clamp(44px, 7vw, 84px);
  background:
    radial-gradient(120% 80% at 92% -10%, rgba(61, 242, 197, .14), transparent 62%),
    radial-gradient(90% 70% at 0% 110%, rgba(182, 107, 78, .14), transparent 60%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-3) 100%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 46px);
  margin-top: clamp(22px, 4vw, 38px);
}

.page-about .about-eyebrow {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--mist);
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 6.2vw, 62px);
  line-height: 1.12;
  letter-spacing: -.035em;
  color: var(--cream);
  max-width: 15ch;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 40ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .about-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 26px;
  margin-top: clamp(26px, 4vw, 38px);
}

.page-about .about-fact {
  padding-left: 14px;
  border-left: 2px solid var(--moss);
}

.page-about .about-fact__num {
  margin: 0;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -.02em;
}

.page-about .about-fact__label {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--text-faint);
}

.page-about .about-plate {
  position: relative;
  align-self: start;
  border-radius: var(--r-lg);
  background: linear-gradient(165deg, var(--ink-2) 0%, #0d201b 100%);
  border: 1px solid var(--line);
  padding: 26px 22px 24px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.page-about .about-plate::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--clay), var(--amber), transparent);
}

.page-about .about-plate__tag {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--clay);
}

.page-about .about-plate__title {
  margin: 0 0 20px;
  font-size: 20px;
  letter-spacing: -.02em;
  color: var(--cream);
}

.page-about .about-plate__row {
  padding: 14px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-plate__label {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
  font-family: var(--font-mono);
}

.page-about .about-plate__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-plate__cta {
  margin-top: 20px;
  width: 100%;
  justify-content: center;
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  padding: clamp(52px, 7.5vw, 96px) 0;
}

.page-about .about-section--story {
  background: var(--ink);
}

.page-about .about-section--band {
  background: linear-gradient(180deg, var(--ink-2) 0%, var(--ink-3) 100%);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .chapter-head {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .chapter-rule {
  display: block;
  width: 92px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--moss), var(--clay));
  margin-bottom: 18px;
}

.page-about .chapter-no {
  margin: 0;
  font-size: clamp(38px, 7vw, 72px);
  line-height: .9;
  letter-spacing: -.05em;
  color: var(--moss);
}

.page-about .chapter-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.6vw, 38px);
  line-height: 1.22;
  letter-spacing: -.03em;
  color: var(--cream);
}

.page-about .chapter-lede {
  margin: 14px 0 0;
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 01 品牌故事 ---------- */

.page-about .story-flow {
  display: grid;
  gap: 18px;
  max-width: 62ch;
}

.page-about .story-flow p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .story-lead {
  font-size: clamp(18px, 2.4vw, 24px) !important;
  line-height: 1.6 !important;
  color: var(--cream) !important;
  letter-spacing: -.01em;
  padding-left: 18px;
  border-left: 3px solid var(--cyan);
}

.page-about .story-note {
  margin-top: 8px !important;
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: rgba(246, 180, 58, .08);
  border: 1px solid rgba(246, 180, 58, .22);
  color: var(--sand) !important;
  font-size: 14px !important;
}

/* ---------- 02 时间线 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
  display: grid;
  gap: 16px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--moss), var(--clay));
  opacity: .7;
}

.page-about .tl-node {
  position: relative;
  padding: 20px 20px 22px;
  border-radius: var(--r-md);
  background: var(--ink-2);
  border: 1px solid var(--line);
  transition: transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 26px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink-3);
  border: 2px solid var(--moss);
  transition: border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .tl-node:hover,
.page-about .tl-node:focus-within {
  transform: translateY(-2px);
  border-color: var(--line-cyan);
  box-shadow: var(--shadow);
}

.page-about .tl-node:hover::before,
.page-about .tl-node:focus-within::before {
  border-color: var(--amber);
  box-shadow: 0 0 0 4px rgba(246, 180, 58, .16);
}

.page-about .tl-node--now {
  border-color: rgba(246, 180, 58, .32);
}

.page-about .tl-era {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-about .tl-title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .tl-tag {
  display: inline-block;
  margin-bottom: 10px;
}

.page-about .tl-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 图片 ---------- */

.page-about .about-figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ink-3);
}

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

.page-about .about-figcaption {
  padding: 12px 18px 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-faint);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-figure--inset {
  max-width: 720px;
}

/* ---------- 03 维护流程 ---------- */

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

.page-about .flow-scroll {
  overflow-x: auto;
  padding: 8px 0 6px;
  border-radius: var(--r-md);
}

.page-about .flow {
  display: block;
  width: 100%;
  min-width: 520px;
  height: auto;
}

.page-about .flow-path path {
  fill: none;
  stroke: var(--line-cyan);
  stroke-width: 1.6;
}

.page-about .flow-path .flow-back {
  stroke: var(--clay);
  stroke-dasharray: 5 6;
  opacity: .85;
}

.page-about .flow-arrow-head {
  fill: var(--cyan);
}

.page-about .flow-node rect {
  fill: var(--ink-2);
  stroke: var(--line);
  stroke-width: 1;
}

.page-about .flow-node text {
  fill: var(--cream);
  font-family: var(--font-body);
  font-size: 13px;
}

.page-about .flow-node text.flow-small {
  fill: var(--text-faint);
  font-size: 11px;
}

.page-about .flow-caption-text {
  fill: var(--text-faint);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
}

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

.page-about .maint-item {
  padding: 16px 18px;
  border-radius: var(--r-md);
  border: 1px solid var(--line-soft);
  background: rgba(22, 42, 37, .55);
  border-left: 3px solid var(--moss);
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}

.page-about .maint-item:hover,
.page-about .maint-item:focus-within {
  transform: translateY(-2px);
  border-left-color: var(--cyan);
}

.page-about .maint-kicker {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--clay);
}

.page-about .maint-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 04 规模数据 ---------- */

.page-about .stat-matrix {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .stat-card {
  padding: 18px 16px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(22, 42, 37, .92) 0%, rgba(7, 27, 22, .92) 100%);
  transition: transform .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .stat-card:hover,
.page-about .stat-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--line-cyan);
  box-shadow: var(--shadow);
}

.page-about .stat-num {
  margin: 0;
  font-size: clamp(24px, 4.2vw, 36px);
  line-height: 1.05;
  letter-spacing: -.03em;
  color: var(--cyan);
}

.page-about .stat-unit {
  font-size: .55em;
  margin-left: 2px;
  color: var(--mist);
}

.page-about .stat-card--amber .stat-num { color: var(--amber); }

.page-about .stat-label {
  margin: 8px 0 0;
  font-size: 13px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .stat-note {
  margin: 6px 0 0;
  font-size: 12px;
  line-height: 1.65;
  color: var(--text-faint);
}

/* ---------- 05 团队 ---------- */

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

.page-about .team-card {
  display: flex;
  gap: 16px;
  padding: 18px 20px;
  border-radius: var(--r-md);
  background: var(--ink-2);
  border: 1px solid var(--line);
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-2px);
  border-color: rgba(182, 107, 78, .45);
}

.page-about .team-bar {
  flex: 0 0 4px;
  border-radius: var(--pill);
  background: linear-gradient(180deg, var(--clay), var(--moss));
}

.page-about .team-body { min-width: 0; }

.page-about .team-count {
  margin: 0;
  font-size: 26px;
  line-height: 1.1;
  color: var(--cream);
  letter-spacing: -.02em;
}

.page-about .team-unit {
  font-size: 13px;
  color: var(--text-faint);
  font-family: var(--font-body);
}

.page-about .team-role {
  margin: 6px 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -.01em;
}

.page-about .team-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ---------- 06 合作 ---------- */

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

.page-about .coop-block {
  padding: 22px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(7, 27, 22, .6);
}

.page-about .coop-block--embed {
  background: linear-gradient(150deg, rgba(97, 126, 99, .22), rgba(7, 27, 22, .82));
  border-color: rgba(61, 242, 197, .24);
}

.page-about .coop-title {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -.015em;
  color: var(--cream);
}

.page-about .coop-block p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.82;
  color: var(--text-dim);
}

.page-about .coop-links {
  font-size: 13px !important;
  color: var(--text-faint) !important;
}

.page-about .coop-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--line-cyan);
  padding-bottom: 1px;
}

.page-about .coop-link:hover,
.page-about .coop-link:focus-visible {
  color: var(--cream);
  border-bottom-color: var(--cream);
}

.page-about .coop-cta {
  margin-top: 4px;
}

.page-about .about-cta {
  margin-top: clamp(28px, 4vw, 44px);
  padding: clamp(26px, 4.5vw, 44px);
  border-radius: var(--r-lg);
  border: 1px solid var(--line-cyan);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(61, 242, 197, .16), transparent 60%),
    linear-gradient(135deg, rgba(97, 126, 99, .34), rgba(7, 27, 22, .92));
}

.page-about .cta-kicker {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--sand);
}

.page-about .cta-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.24;
  letter-spacing: -.03em;
  color: var(--cream);
}

.page-about .cta-text {
  margin: 0;
  max-width: 48ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 桌面增强 ---------- */

@media (min-width: 760px) {
  .page-about .stat-matrix {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .coop-grid {
    grid-template-columns: 1.15fr .85fr;
    gap: 20px;
  }

  .page-about .stat-card {
    padding: 22px 20px 24px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, .82fr);
    align-items: start;
  }

  .page-about .maintain-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }
}

@media (min-width: 1080px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--rail-w) minmax(0, 1fr);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 110px;
    align-self: start;
    padding: 26px 0 0 14px;
  }

  .page-about .stat-matrix {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .timeline {
    padding-left: 36px;
    gap: 20px;
  }

  .page-about .tl-node {
    padding: 24px 26px 26px;
  }

  .page-about .tl-node::before {
    left: -31px;
    top: 30px;
  }

  .page-about .story-flow {
    max-width: 58ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node,
  .page-about .stat-card,
  .page-about .team-card,
  .page-about .maint-item {
    transition: none;
  }

  .page-about .tl-node:hover,
  .page-about .tl-node:focus-within,
  .page-about .stat-card:hover,
  .page-about .stat-card:focus-within,
  .page-about .team-card:hover,
  .page-about .team-card:focus-within,
  .page-about .maint-item:hover,
  .page-about .maint-item:focus-within {
    transform: none;
  }
}
<<<END>>>