.page-about .breadcrumb {
  padding-top: 28px;
  margin-bottom: 4px;
}

/* ── 首屏 ─────────────────────────────── */
.page-about .about-hero {
  padding-block: 24px 56px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(32px, 7.4vw, 62px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.02em;
  max-width: 15em;
}

.page-about .hero-lead {
  margin: 20px 0 0;
  max-width: 36em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .hero-stats li {
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: var(--r-lg);
  padding: 16px 18px 18px;
  position: relative;
  overflow: hidden;
}

.page-about .hero-stats li::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent 78%);
  opacity: .7;
}

.page-about .hero-stats .big-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--gold);
}

.page-about .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-faint);
}

/* ── 章节标题 ─────────────────────────── */
.page-about .sec-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 26px;
}

.page-about .sec-mark {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--text-faint);
  white-space: nowrap;
  transition: color .3s var(--ease);
}

.page-about .sec-title {
  margin: 0 0 10px;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .sec-lead {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ── 时间线 ───────────────────────────── */
.page-about .tl-visual {
  margin: 0 0 30px;
  border: 1px solid var(--outline);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--surface-2);
}

.page-about .tl-visual img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 300px;
  object-fit: cover;
  opacity: .82;
}

.page-about .tl-visual figcaption,
.page-about .cols-figure figcaption,
.page-about .team-figure figcaption {
  padding: 12px 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-faint);
  border-top: 1px solid var(--outline);
}

.page-about .tl-rail {
  margin-top: 4px;
}

.page-about .tl-track {
  display: flex;
  gap: 14px;
  margin: 0;
  padding: 4px 20px 22px;
  list-style: none;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--outline) transparent;
  -webkit-overflow-scrolling: touch;
}

.page-about .tl-track::-webkit-scrollbar {
  height: 6px;
}

.page-about .tl-track::-webkit-scrollbar-thumb {
  background: var(--outline);
  border-radius: var(--r-pill);
}

.page-about .tl-card {
  flex: 0 0 82%;
  scroll-snap-align: start;
  position: relative;
  padding: 22px 20px 24px;
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .tl-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  bottom: 22px;
  width: 3px;
  border-radius: var(--r-pill);
  background: var(--cyan);
  opacity: .75;
}

.page-about .tl-card h3 {
  margin: 8px 0 10px;
  font-size: 19px;
  line-height: 1.4;
  font-weight: 800;
}

.page-about .tl-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .tl-stage {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--neon);
}

/* ── 栏目体系 ─────────────────────────── */
.page-about .cols-grid {
  display: grid;
  gap: 34px;
}

.page-about .cols-text > p {
  margin: 0 0 16px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .cols-points {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .cols-points li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .dot {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  margin-top: 8px;
  border-radius: var(--r-pill);
}

.page-about .dot--neon { background: var(--neon); }
.page-about .dot--cool { background: var(--cool); }
.page-about .dot--amber { background: var(--amber); }

.page-about .cols-figure {
  margin: 0;
  border: 1px solid var(--outline);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--surface-2);
}

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

.page-about .cols-map {
  display: block;
  width: 100%;
  max-width: 200px;
  height: auto;
  margin: 24px auto 0;
}

.page-about .map-node { opacity: .9; }
.page-about .map-node--neon { fill: var(--neon); }
.page-about .map-node--cool { fill: var(--cool); }
.page-about .map-node--amber { fill: var(--amber); }

.page-about .map-sub { opacity: .38; }
.page-about .map-sub--neon { fill: var(--neon); }
.page-about .map-sub--cool { fill: var(--cool); }
.page-about .map-sub--amber { fill: var(--amber); }

/* ── 使用场景 ─────────────────────────── */
.page-about .who-grid {
  display: grid;
  gap: 16px;
}

.page-about .who-card {
  padding: 24px 22px 22px;
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: var(--r-lg);
  border-left-width: 3px;
}

.page-about .who-card--neon { border-left-color: var(--neon); }
.page-about .who-card--cool { border-left-color: var(--cool); }
.page-about .who-card--amber { border-left-color: var(--amber); }

.page-about .who-tag {
  margin: 0 0 12px;
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  background: var(--surface-2);
  border: 1px solid var(--outline);
  color: var(--text-dim);
}

.page-about .who-card h3 {
  margin: 0 0 10px;
  font-size: 19px;
  line-height: 1.42;
  font-weight: 800;
}

.page-about .who-card p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

/* ── 团队 ─────────────────────────────── */
.page-about .team-grid {
  display: grid;
  gap: 34px;
}

.page-about .team-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--outline);
  border: 1px solid var(--outline);
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .team-list li {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 20px 20px 22px;
  background: var(--surface);
}

.page-about .team-num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--gold);
}

.page-about .team-body h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
}

.page-about .team-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--text-dim);
}

.page-about .team-figure {
  margin: 0;
  border: 1px solid var(--outline);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--surface-2);
}

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

/* ── 版本节奏 ─────────────────────────── */
.page-about .cadence-grid {
  display: grid;
  gap: 24px;
}

.page-about .cadence-copy h3 {
  margin: 0 0 12px;
  font-size: 20px;
  line-height: 1.42;
  font-weight: 800;
}

.page-about .cadence-copy p {
  margin: 0 0 14px;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .cadence-read {
  padding: 26px 24px;
  border: 1px solid var(--outline);
  border-radius: var(--r-lg);
  background:
    radial-gradient(120% 90% at 88% 8%, rgba(77, 166, 255, .14), transparent 62%),
    var(--surface-2);
}

.page-about .cadence-ver {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: clamp(44px, 10vw, 70px);
  line-height: 1;
  letter-spacing: .04em;
  color: var(--neon);
}

.page-about .cadence-hint {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.76;
  color: var(--text-dim);
}

.page-about .cadence-rule {
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--outline);
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-faint);
}

/* ── 协作伙伴 ─────────────────────────── */
.page-about .partner-panel {
  padding: 28px 24px;
  border: 1px solid var(--outline);
  border-radius: var(--r-lg);
  background:
    linear-gradient(180deg, rgba(110, 139, 106, .1), transparent 70%),
    var(--surface);
}

.page-about .partner-count {
  margin: 0 0 18px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .partner-count .big-num {
  font-family: var(--font-mono);
  font-size: 48px;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--moss);
}

.page-about .partner-unit {
  font-size: 15px;
  color: var(--text-dim);
}

.page-about .partner-tags {
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .partner-note {
  margin: 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ── 下一步 ───────────────────────────── */
.page-about .next-grid {
  display: grid;
  gap: 16px;
}

.page-about .next-card {
  display: block;
  padding: 26px 24px 28px;
  border: 1px solid var(--outline);
  border-radius: var(--r-lg);
  background: var(--surface);
  text-decoration: none;
  color: inherit;
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .next-card--cool:hover,
.page-about .next-card--cool:focus-visible { border-color: var(--cool); }
.page-about .next-card--amber:hover,
.page-about .next-card--amber:focus-visible { border-color: var(--amber); }

.page-about .next-num {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  letter-spacing: .06em;
  color: var(--text-faint);
}

.page-about .next-card h3 {
  margin: 0 0 10px;
  font-size: 20px;
  font-weight: 800;
}

.page-about .next-card p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .next-card .link-more {
  display: inline-block;
  font-size: 15px;
}

/* ── 断点 ─────────────────────────────── */
@media (min-width: 720px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
    max-width: 940px;
  }

  .page-about .tl-card { flex: 0 0 46%; }

  .page-about .who-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

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

@media (min-width: 900px) {
  .page-about .breadcrumb { padding-top: 36px; }

  .page-about .about-hero { padding-block: 32px 72px; }

  .page-about .section { padding-block: 72px; }

  .page-about .sec-head {
    flex-direction: row;
    gap: 22px;
    margin-bottom: 40px;
  }

  .page-about .sec-mark {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: .22em;
    padding-top: 6px;
  }

  .page-about .sec-head:hover .sec-mark { color: var(--cyan); }

  .page-about .tl-track {
    padding-inline: max(24px, calc((100vw - 1200px) / 2));
  }

  .page-about .cols-grid {
    grid-template-columns: 1.05fr .95fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: 1.1fr .9fr;
    gap: 46px;
    align-items: start;
  }

  .page-about .cadence-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .partner-panel {
    padding: 36px 34px;
  }
}

@media (min-width: 1100px) {
  .page-about .tl-card { flex: 0 0 30%; }
}
</final answer>