.page-about {
  --about-rail-w: 108px;
  --about-amber: var(--c-amber);
  --about-amber-050: var(--c-amber-050);
  --about-cyan: var(--c-cyan);
  --about-cyan-050: var(--c-cyan-050);
  --about-paper: var(--c-surface);
  --about-node-line: var(--c-line);
  display: block;
}

/* ===== 首屏 ===== */
.page-about .about-hero {
  padding-block: 32px 24px;
}

.page-about .about-hero__shell {
  display: grid;
  gap: 28px;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(28px, 7vw, 46px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  font-weight: 700;
  color: #FFFFFF;
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--c-text-dim);
  max-width: 60ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-stat {
  background: var(--c-indigo-700);
  border-left: 3px solid var(--about-cyan);
  padding: 14px 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-radius: var(--radius);
}

.page-about .about-stat__num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--about-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__label {
  font-size: 14px;
  font-weight: 500;
  color: #FFFFFF;
}

.page-about .about-stat__note {
  font-size: 12px;
  line-height: 1.5;
  color: var(--c-text-soft);
}

/* ===== 通用图形容器 ===== */
.page-about .about-figure {
  margin: 0;
  background: var(--c-indigo-700);
  border: 2px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 5 / 3.1;
  object-fit: cover;
  background: var(--c-indigo-700);
}

.page-about .about-figure--wide img {
  aspect-ratio: 1000 / 620;
}

.page-about .about-figure--square img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--map img {
  aspect-ratio: 8 / 5;
}

.page-about .about-figure__caption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-text-soft);
  border-top: 2px solid var(--c-line);
  background: var(--c-ink-indigo);
}

.page-about .about-figure--wide {
  margin-bottom: 32px;
}

/* ===== 沿革轴 ===== */
.page-about .about-timeline .section-head {
  margin-bottom: 24px;
}

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

.page-about .timeline__rail {
  position: sticky;
  top: calc(var(--bar-h) + 6px);
  z-index: 4;
  background: var(--c-ink-indigo);
  border: 2px solid var(--c-line);
  border-radius: var(--radius);
  padding: 8px 10px;
}

.page-about .timeline__rail-title {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-text-soft);
  margin: 0 0 6px;
}

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

.page-about .timeline__year {
  display: inline-block;
  padding: 6px 12px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--c-text-dim);
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  transition: color 140ms ease, border-color 140ms ease, background 140ms ease;
}

.page-about .timeline__year:hover,
.page-about .timeline__year:focus-visible {
  color: var(--about-cyan);
  border-color: var(--c-line-cyan);
  background: var(--c-indigo-700);
}

.page-about .timeline__year:focus-visible {
  outline: 2px solid var(--about-cyan);
  outline-offset: 2px;
}

.page-about .timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .year-node {
  position: relative;
  background: var(--c-indigo-700);
  border: 2px solid var(--c-line);
  border-left: 4px solid var(--c-indigo-500);
  border-radius: var(--radius);
  padding: 18px 16px;
  scroll-margin-top: 140px;
  transition: border-left-color 160ms ease, transform 160ms ease;
}

.page-about .year-node:hover {
  border-left-color: var(--about-cyan);
}

.page-about .year-node__head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

.page-about .year-node__year {
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--about-cyan);
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

.page-about .year-node__ver {
  font-size: 12px;
}

.page-about .year-node__title {
  margin: 0;
  flex-basis: 100%;
  font-size: 18px;
  line-height: 1.45;
  font-weight: 700;
  color: #FFFFFF;
}

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

.page-about .year-node__facts li {
  display: grid;
  gap: 3px;
}

.page-about .year-node__k {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-text-soft);
}

.page-about .year-node__v {
  font-size: 15px;
  line-height: 1.72;
  color: var(--c-text);
}

/* ===== 适配范围 ===== */
.page-about .about-coverage .section-head {
  margin-bottom: 26px;
}

.page-about .growth-bars {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .growth-bar {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr) 52px;
  align-items: center;
  gap: 10px;
}

.page-about .growth-bar__year {
  font-size: 13px;
  color: var(--c-text-soft);
  font-variant-numeric: tabular-nums;
}

.page-about .growth-bar__track {
  position: relative;
  display: block;
  height: 12px;
  background: var(--c-indigo-700);
  border-radius: 2px;
  overflow: hidden;
}

.page-about .growth-bar__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--c-indigo-500), var(--about-cyan));
  border-radius: 2px;
}

.page-about .growth-bar:nth-child(1) .growth-bar__fill { width: 16.7%; }
.page-about .growth-bar:nth-child(2) .growth-bar__fill { width: 33.4%; }
.page-about .growth-bar:nth-child(3) .growth-bar__fill { width: 50%; }
.page-about .growth-bar:nth-child(4) .growth-bar__fill { width: 66.7%; }
.page-about .growth-bar:nth-child(5) .growth-bar__fill { width: 83.4%; }
.page-about .growth-bar:nth-child(6) .growth-bar__fill { width: 100%; }

.page-about .growth-bar__num {
  font-size: 13px;
  text-align: right;
  color: #FFFFFF;
  font-variant-numeric: tabular-nums;
}

.page-about .coverage-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .coverage-item {
  background: var(--c-indigo-700);
  border-left: 3px solid var(--about-cyan);
  border-radius: var(--radius);
  padding: 14px 16px 16px;
  display: grid;
  gap: 6px;
}

.page-about .coverage-item__year {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--about-cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .coverage-item__name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: #FFFFFF;
}

.page-about .coverage-item__scene {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-text-dim);
}

/* ===== 参数校准 ===== */
.page-about .about-method .section-head {
  margin-bottom: 24px;
}

.page-about .method-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--c-line);
}

.page-about .method-step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  align-items: start;
  gap: 4px 16px;
  padding: 20px 0;
  border-bottom: 2px solid var(--c-line);
}

.page-about .method-step__idx {
  grid-row: span 2;
  font-size: 14px;
  font-weight: 700;
  padding-top: 3px;
  color: var(--about-cyan);
  letter-spacing: 0.08em;
}

.page-about .method-step__title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
}

.page-about .method-step__body {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-text-dim);
}

/* ===== 团队 ===== */
.page-about .about-team .section-head {
  margin-bottom: 24px;
}

.page-about .team-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

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

.page-about .team-member {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  align-items: start;
  gap: 14px;
  padding: 16px;
  background: var(--c-indigo-700);
  border-left: 4px solid transparent;
  border-radius: var(--radius);
  transition: border-left-color 160ms ease, background 160ms ease;
}

.page-about .team-member:hover,
.page-about .team-member:focus-within {
  border-left-color: var(--about-cyan);
  background: var(--c-indigo-500);
}

.page-about .team-member__num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--about-cyan);
  font-variant-numeric: tabular-nums;
  padding-top: 3px;
}

.page-about .team-member__name {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: #FFFFFF;
}

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

/* ===== 区域服务 ===== */
.page-about .about-regions .regions-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: center;
}

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

.page-about .regions-facts {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .regions-facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--c-text-dim);
  padding-left: 14px;
  position: relative;
}

.page-about .regions-facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  background: var(--about-cyan);
  border-radius: 1px;
}

.page-about .regions-facts .mono {
  font-size: 17px;
  font-weight: 700;
  color: var(--about-cyan);
  font-variant-numeric: tabular-nums;
}

/* ===== 合作生态 ===== */
.page-about .trust-wrap {
  background: var(--about-amber-050);
  border-top: 4px solid var(--about-amber);
  border-radius: var(--radius);
  padding: 28px 20px 26px;
  color: var(--c-ink);
}

.page-about .trust-wrap .section-head {
  margin-bottom: 22px;
}

.page-about .trust-wrap .section-eyebrow {
  color: #7A5312;
}

.page-about .trust-wrap .section-title {
  color: var(--c-ink);
}

.page-about .trust-wrap .section-desc {
  color: #5A4A2E;
}

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

.page-about .trust-card {
  background: #FFFFFF;
  border-left: 4px solid var(--about-amber);
  border-radius: var(--radius);
  padding: 16px 16px 18px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .trust-card__title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .trust-card__body {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #4A4436;
}

.page-about .trust-marks {
  list-style: none;
  margin: 22px 0 0;
  padding: 18px 0 0;
  border-top: 2px dashed rgba(122, 83, 18, 0.32);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .trust-marks li {
  font-size: 14px;
  line-height: 1.6;
  color: #5A4A2E;
}

.page-about .trust-marks .mono {
  font-size: 16px;
  font-weight: 700;
  color: #8A5A12;
  font-variant-numeric: tabular-nums;
}

.page-about .trust-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ===== 响应式 ===== */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding-block: 44px 32px;
  }
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .year-node__facts li {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 3px 16px;
  }
  .page-about .coverage-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .trust-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .trust-marks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .trust-wrap {
    padding: 32px 26px 30px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__shell {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
    gap: 40px;
  }
  .page-about .about-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-hero__actions {
    margin-top: 28px;
  }
  .page-about .timeline {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }
  .page-about .timeline__rail {
    position: sticky;
    top: calc(var(--bar-h) + 20px);
    padding: 12px 10px;
  }
  .page-about .timeline__rail-title {
    margin-bottom: 8px;
  }
  .page-about .timeline__years {
    flex-direction: column;
    overflow: visible;
    gap: 4px;
  }
  .page-about .timeline__year {
    display: block;
    text-align: left;
    padding-left: 12px;
    border-left: 3px solid transparent;
    border-radius: 0 var(--radius) var(--radius) 0;
  }
  .page-about .timeline__year:hover,
  .page-about .timeline__year:focus-visible {
    border-left-color: var(--about-cyan);
    border-top-color: transparent;
    border-right-color: transparent;
    border-bottom-color: transparent;
  }
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: start;
    gap: 40px;
  }
  .page-about .about-regions .regions-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 44px;
  }
}

@media (min-width: 1024px) {
  .page-about .coverage-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .trust-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .trust-marks {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__shell {
    gap: 56px;
  }
  .page-about .timeline {
    gap: 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__year,
  .page-about .year-node,
  .page-about .team-member {
    transition: none;
  }
}