.page-about {
  background: var(--paper);
  color: var(--char);
  font-family: var(--font-sans);
}

.page-about .about-crumbs-wrap {
  padding-top: 26px;
}

.page-about .about-crumbs {
  font-size: 13px;
  color: var(--moss);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.page-about .about-crumbs a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line-hair);
}

.page-about .about-crumbs a:hover {
  color: var(--ink);
  border-bottom-color: var(--amber);
}

.page-about .crumb-sep {
  color: var(--line);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 26px 0 56px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line-hair) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-hair) 1px, transparent 1px);
  background-size: 54px 54px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 86%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 86%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  align-items: end;
}

.page-about .eyebrow {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber-deep);
  margin: 0 0 16px;
  text-transform: uppercase;
}

.page-about h1 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(30px, 7vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 20px;
  max-width: 18ch;
}

.page-about .about-lead {
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 42ch;
  margin: 0;
}

.page-about .about-facts {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-s);
  overflow: hidden;
}

.page-about .about-facts li {
  background: var(--sheet);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.page-about .fact-num {
  font-size: 24px;
  line-height: 1.1;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-about .fact-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--moss);
}

.page-about .about-hero-figure {
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: var(--stone);
  overflow: hidden;
  box-shadow: var(--shadow-2);
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1200 / 760;
  object-fit: cover;
}

.page-about .about-figure-cap {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--moss);
  padding: 10px 14px;
  background: var(--sheet);
  border-top: 1px solid var(--line-hair);
}

/* ---------- 双栏骨架 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  padding-bottom: 88px;
}

.page-about .about-rail {
  border-top: 1px solid var(--ink);
  padding-top: 14px;
  min-width: 0;
}

.page-about .rail-title {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--moss);
  margin: 0 0 12px;
}

.page-about .about-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 18px;
  overflow-x: auto;
  scrollbar-width: thin;
  padding-bottom: 6px;
}

.page-about .about-rail-list > li {
  flex: 0 0 auto;
}

.page-about .rail-link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 13.5px;
  color: var(--ink-soft);
  text-decoration: none;
  white-space: nowrap;
  padding: 4px 0;
}

.page-about .rail-link .rail-num {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--line);
}

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

.page-about .rail-link.is-active {
  color: var(--ink);
  font-weight: 600;
}

.page-about .rail-link.is-active .rail-num {
  color: var(--amber-deep);
}

.page-about .rail-block {
  margin-top: 22px;
  padding-top: 16px;
  border-top: 1px solid var(--line-hair);
}

.page-about .year-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .year-link {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
  background: var(--sheet);
}

.page-about .year-link:hover {
  border-color: var(--amber);
  color: var(--amber-deep);
}

/* ---------- 章节 ---------- */

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

.page-about .about-sec {
  margin-bottom: 68px;
  scroll-margin-top: 96px;
}

.page-about .about-sec:last-child {
  margin-bottom: 0;
}

.page-about .sec-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
  margin-bottom: 26px;
}

.page-about .sec-num {
  font-size: clamp(32px, 8vw, 58px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--clay);
}

.page-about .sec-head h2 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(20px, 4.4vw, 30px);
  line-height: 1.28;
  color: var(--ink);
  margin: 0;
}

.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--char);
  max-width: 44ch;
}

.page-about .about-prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-prose-single {
  font-size: 16px;
  line-height: 1.85;
  color: var(--char);
  max-width: 46ch;
  margin: 0 0 24px;
}

.page-about .about-note {
  margin-top: 24px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 16px 18px;
  background: var(--sheet);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--amber);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
}

.page-about .about-note .status-dot {
  margin-top: 6px;
  flex: 0 0 auto;
}

.page-about .about-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 场景网格 ---------- */

.page-about .scenario-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .scenario {
  background: var(--sheet);
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .scenario h3 {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
  margin: 0;
}

.page-about .scenario p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--char);
}

/* ---------- 年表 ---------- */

.page-about .about-wide-figure {
  margin: 0 0 28px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
  background: var(--stone);
}

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

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
  border-left: 1px solid var(--line);
}

.page-about .timeline li {
  position: relative;
  padding: 0 0 26px 6px;
  scroll-margin-top: 100px;
}

.page-about .timeline li:last-child {
  padding-bottom: 0;
}

.page-about .timeline li::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px var(--paper);
}

.page-about .tl-year {
  display: block;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber-deep);
  margin-bottom: 4px;
}

.page-about .timeline h3 {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 6px;
  line-height: 1.4;
}

.page-about .timeline p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--char);
  max-width: 46ch;
}

/* ---------- 团队 ---------- */

.page-about .team-tabs {
  margin-top: 4px;
}

.page-about .team-tabs details {
  background: var(--sheet);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-s);
  margin-bottom: 8px;
  overflow: hidden;
}

.page-about .team-tabs details[open] {
  border-color: var(--moss);
  box-shadow: var(--shadow-1);
}

.page-about .team-tabs summary {
  list-style: none;
  cursor: pointer;
  padding: 15px 18px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .team-tabs summary::-webkit-details-marker {
  display: none;
}

.page-about .team-tabs summary::marker {
  content: "";
}

.page-about .team-tabs summary:hover {
  color: var(--ink-soft);
}

.page-about .summary-meta {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--line);
  font-weight: 400;
}

.page-about .team-tabs details[open] .summary-meta {
  color: var(--amber-deep);
}

.page-about .role-body {
  padding: 0 18px 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--char);
  border-top: 1px solid var(--line-hair);
  padding-top: 14px;
  margin-top: 0;
}

.page-about .flow-strip {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 16px 18px;
  background: var(--ink);
  border-radius: var(--radius-m);
}

.page-about .flow-step {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-size: 13px;
  color: var(--paper);
  letter-spacing: 0.02em;
}

.page-about .flow-idx {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .flow-arrow {
  color: var(--moss);
  font-size: 13px;
}

/* ---------- 指标条 ---------- */

.page-about .metric-strip {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .metric-strip li {
  background: var(--sheet);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .metric-num {
  font-size: 26px;
  line-height: 1.1;
  letter-spacing: 0.04em;
  color: var(--amber-deep);
}

.page-about .metric-label {
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--moss);
}

/* ---------- 合作生态 ---------- */

.page-about .eco-panel {
  margin-top: 26px;
  background: var(--ink);
  border-radius: var(--radius-m);
  padding: 28px 22px;
  color: var(--paper);
}

.page-about .eco-kicker {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--amber);
  margin: 0 0 12px;
}

.page-about .eco-panel h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(17px, 3.6vw, 22px);
  line-height: 1.5;
  margin: 0 0 14px;
  color: var(--paper);
}

.page-about .eco-text {
  margin: 0 0 22px;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(239, 234, 225, 0.82);
  max-width: 48ch;
}

.page-about .eco-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-btn {
  display: inline-block;
  padding: 11px 22px;
  border-radius: var(--radius-pill);
  background: var(--amber);
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--amber);
}

.page-about .about-btn:hover {
  background: var(--paper);
  border-color: var(--paper);
}

.page-about .about-btn-ghost {
  display: inline-block;
  padding: 11px 22px;
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--paper);
  font-size: 14px;
  text-decoration: none;
  border: 1px solid rgba(239, 234, 225, 0.34);
}

.page-about .about-btn-ghost:hover {
  border-color: var(--amber);
  color: var(--amber);
}

/* ---------- 响应式 ---------- */

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

  .page-about .about-hero {
    padding: 34px 0 68px;
  }

  .page-about .eco-panel {
    padding: 34px 30px;
  }
}

@media (min-width: 940px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 56px;
  }

  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 60px;
    padding-bottom: 110px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-rail-list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail-list > li {
    flex: none;
  }

  .page-about .rail-link {
    display: flex;
    width: 100%;
    padding: 9px 0 9px 10px;
    border-bottom: 1px solid var(--line-hair);
    transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
  }

  .page-about .rail-link.is-active {
    padding-left: 14px;
    box-shadow: inset 2px 0 0 var(--amber);
  }

  .page-about .about-sec {
    margin-bottom: 84px;
  }

  .page-about .about-prose p,
  .page-about .about-prose-single {
    font-size: 16.5px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-layout {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 76px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .rail-link {
    transition: none;
  }
}
<<<END>>>