.page-about {
  --about-rail-w: 172px;
  --about-pad: clamp(44px, 6.5vw, 96px);
  background: var(--void);
  color: var(--text);
  overflow-x: hidden;
}

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

.page-about [id] {
  scroll-margin-top: calc(var(--header-h) + 20px);
}

.page-about h1 {
  margin: 0.18em 0 0.5em;
  font-size: clamp(2.15rem, 6.4vw, 5.4rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--bone);
}

.page-about h1::after {
  content: "";
  display: block;
  width: 64px;
  height: 3px;
  margin-top: 0.62em;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
}

.page-about h2 {
  margin: 0 0 0.6em;
  font-size: clamp(1.55rem, 3.3vw, 2.75rem);
  line-height: 1.14;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: var(--bone);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 4.6vw, 60px) 0 clamp(40px, 6vw, 86px);
  background:
    radial-gradient(120% 90% at 86% -12%, rgba(34, 214, 214, 0.10), transparent 60%),
    var(--void);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: end;
  margin-top: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__lede {
  max-width: 34em;
  margin: 0;
  font-size: clamp(1rem, 1.35vw, 1.15rem);
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .about-hero__note {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5em;
  margin: 1.5em 0 0;
  font-size: 0.9rem;
  color: var(--text-mute);
}

.page-about .about-facts {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-facts li:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.page-about .about-facts__num {
  font-size: clamp(1.55rem, 2.5vw, 2rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .about-facts__num em {
  font-style: normal;
  font-size: 0.52em;
  margin-left: 2px;
  color: var(--text-dim);
}

.page-about .about-facts__lab {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--text-mute);
}

/* ---------- 通用两栏布局 ---------- */
.page-about .about-story,
.page-about .about-timeline,
.page-about .about-team,
.page-about .about-eco,
.page-about .about-commitment {
  padding: var(--about-pad) 0;
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.5vw, 40px);
}

.page-about .about-rail {
  position: relative;
  min-width: 0;
}

.page-about .about-rail::before {
  content: "";
  display: block;
  width: 28px;
  height: 1px;
  margin-bottom: 12px;
  background: var(--cyan);
}

.page-about .about-rail__hint {
  margin: 10px 0 0;
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--text-mute);
}

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

.page-about .about-rail__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 14px;
  margin-top: 14px;
}

.page-about .rail-link {
  display: inline-block;
  padding: 7px 10px 0 0;
  border-top: 1px solid var(--line);
  color: var(--text-mute);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

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

/* ---------- 起点叙事 ---------- */
.page-about .about-body .prose p {
  color: var(--text-dim);
}

.page-about .about-body .prose a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 214, 214, 0.4);
}

.page-about .about-body .prose a:hover,
.page-about .about-body .prose a:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .about-placards {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-placards__head {
  margin: 8px 0 6px;
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--bone);
}

.page-about .about-placards__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--text-dim);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-milestones {
  list-style: none;
  position: relative;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .about-milestones::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--stone) 58%, transparent 100%);
}

.page-about .about-milestone {
  position: relative;
  padding-left: 34px;
}

.page-about .about-milestone::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 14px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--void);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(34, 214, 214, 0.10);
}

.page-about .about-milestone__card {
  padding: clamp(14px, 2vw, 20px) clamp(16px, 2.2vw, 22px);
  background: var(--ink);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-milestone__card:hover {
  border-color: var(--line);
  transform: translateX(2px);
}

.page-about .about-milestone__card h3 {
  margin: 8px 0 6px;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  font-weight: 700;
  color: var(--bone);
}

.page-about .about-milestone__card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .about-timeline__figure {
  margin-top: clamp(28px, 4vw, 48px);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .team-card {
  position: relative;
  padding: 22px 20px 24px;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: linear-gradient(165deg, var(--ink), var(--void));
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .team-card::after {
  content: "";
  position: absolute;
  top: -34px;
  right: -34px;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(34, 214, 214, 0.16), transparent 72%);
  pointer-events: none;
}

.page-about .team-card:hover {
  border-color: var(--line);
  transform: translateY(-3px);
}

.page-about .team-card--ops { --card-accent: var(--cyan); }
.page-about .team-card--eng { --card-accent: var(--orange); }
.page-about .team-card--care { --card-accent: var(--clay); }

.page-about .team-card .index-label {
  color: var(--card-accent);
}

.page-about .team-card__num {
  margin: 12px 0 0;
  font-size: clamp(2rem, 4vw, 2.55rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--bone);
}

.page-about .team-card__num em {
  font-style: normal;
  font-size: 0.4em;
  margin-left: 3px;
  letter-spacing: 0;
  color: var(--text-mute);
}

.page-about .team-card h3 {
  margin: 12px 0 8px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--card-accent);
}

.page-about .team-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.74;
  color: var(--text-dim);
}

/* ---------- 数据流程 · 反色区 ---------- */
.page-about .about-flow {
  padding: clamp(48px, 7vw, 104px) 0;
  background: var(--bone);
  color: var(--ink);
}

.page-about .about-flow .index-label {
  color: var(--clay);
}

.page-about .about-flow__head h2 {
  margin: 0.2em 0 0.55em;
  color: var(--ink);
}

.page-about .about-flow__head p {
  max-width: 36em;
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.78;
  color: rgba(16, 23, 28, 0.74);
}

.page-about .about-flow__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  margin-top: clamp(26px, 4vw, 44px);
}

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

.page-about .flow-step {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  background: rgba(8, 11, 15, 0.045);
  border: 1px solid rgba(16, 23, 28, 0.14);
  border-radius: var(--radius-m);
}

.page-about .flow-step::before {
  counter-increment: flow;
  content: counter(flow, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.3;
  color: var(--clay);
}

.page-about .flow-step h3 {
  margin: 0 0 4px;
  font-size: 0.98rem;
  font-weight: 800;
  color: var(--ink);
}

.page-about .flow-step p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: rgba(16, 23, 28, 0.76);
}

.page-about .about-flow__figure {
  margin: 0;
}

/* ---------- 合作生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .eco-card {
  padding: 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: rgba(16, 23, 28, 0.62);
}

.page-about .eco-card__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .eco-card h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--bone);
}

.page-about .eco-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .eco-honor {
  margin-top: clamp(20px, 3vw, 32px);
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: rgba(184, 112, 74, 0.10);
}

.page-about .eco-honor__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .eco-honor__list li {
  position: relative;
  padding-left: 20px;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .eco-honor__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 2px;
  border-radius: 2px;
  background: var(--clay);
}

/* ---------- 服务与入口 ---------- */
.page-about .about-promise {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding: clamp(26px, 4vw, 54px);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  background:
    radial-gradient(120% 100% at 0% 0%, rgba(34, 214, 214, 0.10), transparent 58%),
    linear-gradient(180deg, var(--ink), var(--void));
}

.page-about .about-promise__list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-promise__list li {
  position: relative;
  padding-left: 22px;
  font-size: 0.95rem;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .about-promise__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.74em;
  width: 10px;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
}

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

.page-about .about-promise__figure {
  margin: 0;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-placards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .page-about .team-grid,
  .page-about .eco-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 4.5vw, 68px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 22px);
    align-self: start;
    padding-top: 4px;
  }

  .page-about .about-rail__nav {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
  }

  .page-about .rail-link {
    padding: 7px 0 7px 13px;
    border-top: none;
    border-left: 1px solid var(--line);
    transition: color 0.25s var(--ease), border-color 0.25s var(--ease), padding-left 0.25s var(--ease);
  }

  .page-about .rail-link:hover,
  .page-about .rail-link:focus-visible {
    padding-left: 17px;
  }
}

@media (min-width: 960px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-promise {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}
<<<END>>>