.page-about {
  --about-gap: clamp(20px, 3vw, 34px);
  --about-pad: clamp(24px, 3.4vw, 40px);
  background: var(--paper);
  color: var(--text-ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background: var(--ink-blue);
  color: var(--on-dark);
  padding: clamp(24px, 4vw, 44px) 0 clamp(46px, 7vw, 88px);
}

.page-about .about-hero__crumb {
  margin-bottom: clamp(20px, 3vw, 32px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--on-dark-dim);
}

.page-about .about-hero__crumb a {
  color: var(--gold-light);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.16s ease, color 0.16s ease;
}

.page-about .about-hero__crumb a:hover,
.page-about .about-hero__crumb a:focus-visible {
  border-bottom-color: var(--gold);
}

.page-about .about-hero__frame {
  padding: clamp(22px, 4vw, 56px);
  background: rgba(22, 38, 61, 0.55);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-weight: 300;
  font-size: clamp(29px, 5.6vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 17em;
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--on-dark-dim);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(26px, 4vw, 44px);
  background: var(--rule-on-dark-soft);
  border-top: 1px solid var(--rule-on-dark);
  border-bottom: 1px solid var(--rule-on-dark);
}

.page-about .about-hero__stat {
  background: var(--ink-blue-2);
  padding: 16px 18px;
}

.page-about .about-hero__stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.1;
  color: var(--gold-light);
  letter-spacing: 0.01em;
}

.page-about .about-hero__stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--on-dark-faint);
}

/* ---------- 通用标题 ---------- */
.page-about .about-h2 {
  margin: 12px 0 0;
  font-weight: 400;
  font-size: clamp(23px, 3.4vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.015em;
  color: var(--text-ink);
}

.page-about .about-lead {
  margin: 14px 0 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.8;
  color: var(--index-gray);
}

.page-about .section--dark .about-h2,
.page-about .about-hero .about-h2 {
  color: var(--on-dark);
}

.page-about .section--dark .about-lead {
  color: var(--on-dark-dim);
}

/* ---------- 发展脉络 ---------- */
.page-about .about-path {
  background: var(--paper);
}

.page-about .about-path__banner {
  margin: 0 0 clamp(32px, 5vw, 60px);
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0 0 0 52px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--rule);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(24px, 3.4vw, 40px);
}

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

.page-about .timeline__num {
  position: absolute;
  left: -53px;
  top: 1px;
  width: 32px;
  height: 24px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold);
  background: var(--paper);
  border: 1px solid var(--rule);
  transition: color 0.16s ease, border-color 0.16s ease, background-color 0.16s ease;
}

.page-about .timeline__item:hover .timeline__num {
  color: var(--ink-blue);
  background: var(--gold-light);
  border-color: var(--gold);
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-size: clamp(17px, 1.9vw, 21px);
  font-weight: 500;
  line-height: 1.4;
  color: var(--text-ink);
}

.page-about .timeline__text {
  margin: 0;
  font-size: clamp(14px, 1.3vw, 16px);
  line-height: 1.8;
  color: var(--index-gray);
}

/* ---------- 服务版图 ---------- */
.page-about .about-reach {
  background: var(--mist);
}

.page-about .reach-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  margin-top: clamp(24px, 4vw, 42px);
}

.page-about .reach-map {
  background: var(--ink-blue);
  border: 1px solid var(--rule);
  padding: clamp(14px, 2.4vw, 26px);
}

.page-about .reach-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .reach-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .reach-points__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding-bottom: clamp(14px, 2vw, 20px);
  border-bottom: 1px solid var(--rule);
}

.page-about .reach-points__item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.page-about .reach-points__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gold);
  padding-top: 4px;
}

.page-about .reach-points__text {
  margin: 0;
  font-size: clamp(14px, 1.3vw, 16px);
  line-height: 1.8;
  color: var(--text-ink);
}

.page-about .reach-bars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(24px, 4vw, 38px);
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .reach-bar {
  background: var(--paper);
  padding: 18px 20px;
}

.page-about .reach-bar__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1.1;
  color: var(--ink-blue);
}

.page-about .reach-bar__label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--index-gray);
}

/* ---------- 目录结构 ---------- */
.page-about .about-index {
  background: var(--ink-blue);
  color: var(--on-dark);
}

.page-about .index-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(26px, 4vw, 42px);
}

.page-about .index-cell {
  border: 1px solid var(--rule-on-dark-soft);
  background: rgba(22, 38, 61, 0.62);
  padding: clamp(18px, 2.4vw, 26px);
  transition: border-color 0.16s ease, background-color 0.16s ease;
}

.page-about .index-cell:hover,
.page-about .index-cell:focus-within {
  border-color: var(--gold);
  background: rgba(32, 54, 84, 0.86);
}

.page-about .index-cell__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold-light);
}

.page-about .index-cell__name {
  margin: 10px 0 6px;
  font-size: clamp(17px, 1.8vw, 20px);
  font-weight: 500;
  color: var(--on-dark);
}

.page-about .index-cell__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--on-dark-dim);
}

.page-about .index-figure {
  margin: clamp(26px, 4vw, 42px) 0 0;
}

.page-about .index-find {
  margin-top: clamp(24px, 3.6vw, 38px);
  border-top: 1px solid var(--rule-on-dark);
  padding-top: clamp(18px, 2.6vw, 26px);
}

.page-about .index-find__title {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold-light);
}

.page-about .index-find__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .index-find__item {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--on-dark);
  border: 1px solid var(--rule-on-dark);
  padding: 7px 14px;
  transition: border-color 0.16s ease, color 0.16s ease;
}

.page-about .index-find__item:hover {
  border-color: var(--gold);
  color: var(--gold-light);
}

.page-about .index-find__note {
  margin: 16px 0 0;
  max-width: 64ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--on-dark-dim);
}

/* ---------- 团队与响应 ---------- */
.page-about .about-team {
  background: var(--paper);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 42px);
}

.page-about .team-card {
  background: var(--mist);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--ink-blue);
  padding: clamp(20px, 2.6vw, 30px);
}

.page-about .team-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .team-card__name {
  margin: 10px 0 8px;
  font-size: clamp(17px, 1.9vw, 21px);
  font-weight: 500;
  color: var(--text-ink);
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--index-gray);
}

.page-about .team-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 24px);
  margin-top: clamp(20px, 3vw, 32px);
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--mist);
  border: 1px solid var(--rule);
}

.page-about .team-flow__step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: start;
}

.page-about .team-flow__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--paper);
  background: var(--ink-blue);
  padding: 4px 8px;
  letter-spacing: 0.08em;
}

.page-about .team-flow__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--text-ink);
}

/* ---------- 资质与合作 ---------- */
.page-about .about-trust {
  background: var(--mist);
}

.page-about .trust-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  margin-top: clamp(24px, 4vw, 42px);
}

.page-about .trust-badge {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--gold);
  padding: clamp(20px, 2.6vw, 28px);
}

.page-about .trust-badge__code {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .trust-badge__name {
  margin: 12px 0 8px;
  font-size: clamp(17px, 1.8vw, 20px);
  font-weight: 500;
  color: var(--text-ink);
}

.page-about .trust-badge__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--index-gray);
}

.page-about .trust-partners {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: clamp(20px, 2.6vw, 28px);
}

.page-about .trust-partners__title {
  margin: 0 0 18px;
  font-size: clamp(16px, 1.7vw, 19px);
  font-weight: 500;
  line-height: 1.5;
  color: var(--text-ink);
}

/* ---------- 荣誉 ---------- */
.page-about .about-honor {
  background: var(--paper);
}

.page-about .honor-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(24px, 4vw, 40px);
}

.page-about .honor-grid .tag-card {
  background: var(--paper);
  transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}

.page-about .honor-grid .tag-card:hover,
.page-about .honor-grid .tag-card:focus-within {
  transform: translateY(2px);
  border-color: var(--gold);
  box-shadow: 0 6px 18px rgba(14, 27, 46, 0.08);
}

.page-about .honor-card__title {
  margin: 12px 0 8px;
  font-size: clamp(17px, 1.8vw, 20px);
  font-weight: 500;
  line-height: 1.4;
  color: var(--text-ink);
}

.page-about .honor-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--index-gray);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  background: var(--ink-blue);
  color: var(--on-dark);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.6vw, 36px);
}

.page-about .about-next__actions .btn {
  text-decoration: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .reach-bars {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .index-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .honor-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 760px) {
  .page-about .timeline {
    padding-left: 76px;
  }

  .page-about .timeline::before {
    left: 23px;
  }

  .page-about .timeline__num {
    left: -73px;
    width: 40px;
    height: 28px;
    font-size: 13px;
  }

  .page-about .team-flow {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .reach-grid {
    grid-template-columns: 1.12fr 1fr;
    align-items: center;
  }

  .page-about .index-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .team-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .trust-grid {
    grid-template-columns: 1fr 1fr 1.5fr;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .index-cell,
  .page-about .timeline__num,
  .page-about .honor-grid .tag-card,
  .page-about .index-find__item {
    transition: none;
  }

  .page-about .honor-grid .tag-card:hover,
  .page-about .honor-grid .tag-card:focus-within {
    transform: none;
  }
}