.page-about {
  --about-line: rgba(10, 26, 47, 0.14);
  --about-on-dark: rgba(245, 249, 255, 0.72);
  background: var(--ice);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: clip;
}

.page-about .about-hero {
  display: grid;
  gap: 28px;
  padding: 24px 0 44px;
}

.page-about .about-hero-copy h1 {
  margin: 12px 0 16px;
  font-size: clamp(1.85rem, 5.6vw, 3rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
  font-weight: 800;
}

.page-about .about-hero-copy .lede {
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .hero-stats {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
}

.page-about .hero-stat {
  border-left: 3px solid var(--cyan);
  padding-left: 12px;
  display: grid;
  gap: 3px;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.55rem, 3.6vw, 2.15rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--ink);
  white-space: nowrap;
}

.page-about .stat-label {
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--slate);
}

.page-about .about-hero-figure {
  margin: 0;
}

.page-about .about-hero-figure .media-frame {
  aspect-ratio: 4 / 3;
  border: var(--border);
  background: var(--white);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

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

.page-about .media-caption {
  margin-top: 10px;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .section-head {
  margin-bottom: 26px;
}

.page-about .section-head h2 {
  margin: 8px 0 8px;
  font-size: clamp(1.4rem, 3.6vw, 2rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  font-weight: 800;
}

.page-about .section-sub {
  max-width: 66ch;
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--slate);
}

/* ---- 团队分工 ---- */
.page-about .about-team {
  padding: 44px 0 48px;
  border-top: 2px solid var(--black);
  background: var(--white);
}

.page-about .role-board {
  display: grid;
  gap: 18px;
}

.page-about .role-card {
  position: relative;
  border: var(--border);
  background: var(--ice);
  box-shadow: var(--shadow-hard);
  padding: 22px 20px 20px;
  transition: transform 0.18s ease;
}

.page-about .role-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 6px;
  background: var(--cyan);
}

.page-about .role-card:nth-child(2)::before {
  background: var(--amber);
}

.page-about .role-card:nth-child(3)::before {
  background: var(--teal);
}

.page-about .role-card:hover,
.page-about .role-card:focus-within {
  transform: translate(-2px, -3px);
}

.page-about .role-card .index-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  background: var(--ink);
  color: var(--cyan);
}

.page-about .role-title {
  margin: 14px 0 10px;
  font-size: 1.1875rem;
  font-weight: 800;
  line-height: 1.3;
}

.page-about .role-body {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .role-meta {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 2px dotted var(--about-line);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--slate);
}

/* ---- 运营历程 ---- */
.page-about .about-timeline {
  padding: 48px 0 52px;
  background: var(--ink);
  color: var(--ice);
  border-top: 2px solid var(--black);
  border-bottom: 2px solid var(--black);
}

.page-about .about-timeline .eyebrow {
  color: var(--amber);
}

.page-about .about-timeline .section-head h2 {
  color: var(--white);
}

.page-about .about-timeline .section-sub {
  color: var(--about-on-dark);
}

.page-about .timeline-figure {
  margin: 0 0 30px;
}

.page-about .timeline-figure .media-frame {
  aspect-ratio: 12 / 7;
  border: 2px solid var(--ice);
  background: var(--white);
  box-shadow: 6px 6px 0 rgba(0, 194, 255, 0.6);
  overflow: hidden;
}

.page-about .timeline-figure .media-caption {
  color: var(--about-on-dark);
}

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

.page-about .timeline-node {
  border: 2px solid rgba(220, 235, 250, 0.22);
  background: rgba(255, 255, 255, 0.04);
  transition: border-color 0.18s ease, background 0.18s ease;
}

.page-about .timeline-node[open] {
  border-color: var(--cyan);
  background: rgba(0, 194, 255, 0.09);
}

.page-about .timeline-node summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .timeline-node summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline-node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--amber);
  line-height: 1;
}

.page-about .timeline-node[open] summary::after {
  content: "−";
  color: var(--cyan);
}

.page-about .timeline-year {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--cyan);
  flex: 0 0 auto;
}

.page-about .timeline-title {
  flex: 1 1 12ch;
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--white);
}

.page-about .timeline-body {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--about-on-dark);
}

/* ---- 更新节奏 ---- */
.page-about .about-maintenance {
  padding: 48px 0 50px;
  background: var(--fog);
  border-bottom: 2px solid var(--black);
}

.page-about .cadence {
  display: grid;
  gap: 22px;
}

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

.page-about .cadence-item {
  display: grid;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 2px dotted rgba(30, 58, 95, 0.28);
}

.page-about .cadence-item:first-child {
  border-top: 2px dotted rgba(30, 58, 95, 0.28);
}

.page-about .cadence-when {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--steel);
}

.page-about .cadence-what {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .doc-card {
  border: var(--border);
  background: var(--ink);
  color: var(--ice);
  box-shadow: var(--shadow-hard);
  padding: 24px 22px;
}

.page-about .doc-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 8vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .doc-title {
  margin: 8px 0 12px;
  font-size: 1.0625rem;
  font-weight: 800;
  color: var(--white);
}

.page-about .doc-body {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--about-on-dark);
}

.page-about .doc-link {
  display: inline-block;
  margin-top: 16px;
  padding-bottom: 2px;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--amber);
  text-decoration: none;
  border-bottom: 2px dashed var(--amber);
}

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

/* ---- 快速访问 ---- */
.page-about .about-access {
  padding: 48px 0 46px;
  background: var(--ice);
}

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

.page-about .access-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-top: 2px dashed rgba(30, 58, 95, 0.22);
}

.page-about .access-item:last-child {
  border-bottom: 2px dashed rgba(30, 58, 95, 0.22);
}

.page-about .access-num {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: var(--border);
  background: var(--ink);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
}

.page-about .access-text h3 {
  margin: 0 0 6px;
  font-size: 1.0625rem;
  font-weight: 800;
  line-height: 1.35;
}

.page-about .access-text p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--steel);
}

/* ---- 服务范围 ---- */
.page-about .about-reach {
  padding: 48px 0 52px;
  background: var(--white);
  border-top: 2px solid var(--black);
}

.page-about .reach-figure {
  margin: 0 0 30px;
}

.page-about .reach-figure .media-frame {
  aspect-ratio: 14 / 5;
  border: var(--border);
  background: var(--fog);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

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

.page-about .reach-copy h2 {
  margin: 8px 0 14px;
  font-size: clamp(1.4rem, 3.6vw, 1.95rem);
  line-height: 1.28;
  font-weight: 800;
}

.page-about .reach-copy p {
  margin: 0 0 12px;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .reach-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border: var(--border);
  background: var(--ice);
  box-shadow: var(--shadow-soft);
}

.page-about .reach-list li {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  border-bottom: 2px dotted var(--about-line);
}

.page-about .reach-list li:last-child {
  border-bottom: 0;
}

.page-about .reach-key {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--teal);
}

.page-about .reach-val {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--ink);
  overflow-wrap: anywhere;
}

/* ---- 结尾行动区 ---- */
.page-about .about-cta {
  padding: 40px 0 52px;
  background: var(--cyan);
  border-top: 2px solid var(--black);
}

.page-about .cta-inner {
  display: grid;
  gap: 22px;
}

.page-about .about-cta h2 {
  margin: 0 0 8px;
  font-size: clamp(1.3rem, 3.4vw, 1.75rem);
  line-height: 1.3;
  font-weight: 800;
  color: var(--ink);
}

.page-about .about-cta p {
  margin: 0;
  max-width: 56ch;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--ink);
}

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

.page-about .cta-link {
  display: inline-block;
  padding: 10px 18px;
  border: 2px solid var(--black);
  background: var(--ice);
  color: var(--ink);
  font-size: 0.9375rem;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 4px 4px 0 var(--black);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.page-about .cta-link:hover,
.page-about .cta-link:focus-visible {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 var(--black);
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 2px;
}

@media (min-width: 720px) {
  .page-about .role-board {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .access-item {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 22px;
    padding: 22px 0;
  }

  .page-about .cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 32px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    gap: 46px;
    padding: 32px 0 56px;
    align-items: start;
  }

  .page-about .about-hero-figure {
    margin-top: 6px;
  }

  .page-about .cadence {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .reach-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 38px;
    align-items: start;
  }

  .page-about .timeline-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-card,
  .page-about .timeline-node,
  .page-about .cta-link {
    transition: none;
  }

  .page-about .role-card:hover,
  .page-about .role-card:focus-within {
    transform: none;
  }
}
<<<END>>>