.page-about {
  background: var(--c-cream);
  color: var(--c-ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding-block: clamp(104px, 13vw, 164px) clamp(52px, 7vw, 92px);
  border-bottom: 1px solid var(--c-line);
  background-image:
    repeating-linear-gradient(0deg, rgba(var(--rgb-line), .58) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(90deg, rgba(var(--rgb-line), .58) 0 1px, transparent 1px 40px),
    linear-gradient(180deg, #FFFDF9 0%, var(--c-cream) 100%);
}

.page-about .breadcrumb {
  margin-bottom: clamp(22px, 3vw, 34px);
  font-size: .8125rem;
  color: var(--c-ink-soft);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .ab-hero h1 {
  margin: 16px 0 0;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.95rem, 5vw, 3.3rem);
  line-height: 1.18;
  letter-spacing: -0.012em;
  max-width: 17em;
}

.page-about .ab-hero__lede {
  margin: 22px 0 0;
  max-width: 56ch;
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.85;
  color: var(--c-ink-soft);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .ab-hero__panel {
  display: grid;
  gap: 18px;
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  background: var(--c-white);
  box-shadow: var(--shadow-1);
}

.page-about .ab-anchor {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: baseline;
  gap: 4px 8px;
  padding-bottom: 16px;
  border-bottom: 1px dashed var(--c-line);
}

.page-about .ab-anchor:last-of-type {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .ab-anchor__value {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-apricot-deep);
}

.page-about .ab-anchor__unit {
  font-size: .8125rem;
  letter-spacing: .06em;
  color: var(--c-ink-soft);
}

.page-about .ab-anchor__desc {
  grid-column: 1 / -1;
  margin: 0;
  font-size: .9375rem;
  line-height: 1.7;
  color: var(--c-ink-soft);
}

.page-about .ab-hero__panel-note {
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--c-line);
  font-size: .875rem;
  line-height: 1.75;
  color: var(--c-ink-soft);
}

.page-about .ab-hero__panel-note a {
  color: var(--c-apricot-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
  .page-about .ab-hero__panel {
    margin-top: 10px;
  }
}

/* ---------- 发展节点 ---------- */
.page-about .ab-history {
  padding-block: clamp(56px, 8vw, 104px);
  border-bottom: 1px solid var(--c-line);
}

.page-about .ab-history__head {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-bottom: clamp(40px, 6vw, 72px);
}

.page-about .ab-history__figure {
  margin: 0;
}

@media (min-width: 960px) {
  .page-about .ab-history__head {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: end;
  }
  .page-about .ab-history__figure {
    transform: translateY(8px);
  }
}

.page-about .ab-axis {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: 30px;
}

.page-about .ab-axis::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--c-line-strong);
}

.page-about .ab-axis__item {
  position: relative;
  padding-left: 30px;
}

.page-about .ab-axis__dot {
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-cream);
  border: 2px solid var(--c-leaf);
  transition: transform 180ms ease-out, background 180ms ease-out, border-color 180ms ease-out;
}

.page-about .ab-axis__item:hover .ab-axis__dot {
  background: var(--c-apricot);
  border-color: var(--c-apricot);
  transform: scale(1.28);
}

.page-about .ab-axis__year {
  display: inline-block;
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--c-apricot-deep);
}

.page-about .ab-axis__title {
  margin: 8px 0 6px;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.5;
  color: var(--c-ink);
}

.page-about .ab-axis__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--c-ink-soft);
}

@media (min-width: 900px) {
  .page-about .ab-axis {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 20px;
    padding-top: 34px;
  }
  .page-about .ab-axis::before {
    left: 0;
    right: 0;
    top: 5px;
    bottom: auto;
    width: auto;
    height: 1px;
  }
  .page-about .ab-axis__item {
    padding-left: 0;
  }
  .page-about .ab-axis__dot {
    left: 0;
    top: 0;
  }
}

/* ---------- 片区信息 ---------- */
.page-about .ab-regions {
  padding-block: clamp(56px, 8vw, 104px);
  background: var(--c-cream);
}

.page-about .ab-regions__tabs {
  margin-top: clamp(32px, 5vw, 54px);
}

.page-about .ab-regions__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .ab-region {
  display: grid;
  gap: 3px;
  padding: 16px 18px;
  text-align: left;
  font: inherit;
  color: inherit;
  cursor: pointer;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-white);
  box-shadow: none;
  transition: transform 180ms ease-out, box-shadow 180ms ease-out, border-color 180ms ease-out, background 180ms ease-out;
}

.page-about .ab-region:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
  border-color: var(--c-apricot);
}

.page-about .ab-region:focus-visible {
  outline: 2px solid var(--c-sun);
  outline-offset: 2px;
}

.page-about .ab-region[aria-selected="true"] {
  background: var(--c-leaf-soft);
  border-color: var(--c-leaf);
}

.page-about .ab-region__name {
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .ab-region[aria-selected="true"] .ab-region__name {
  color: var(--c-leaf-deep);
}

.page-about .ab-region__count {
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.15;
  color: var(--c-apricot-deep);
}

.page-about .ab-region__unit {
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--c-ink-soft);
}

@media (min-width: 720px) {
  .page-about .ab-regions__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }
  .page-about .ab-region {
    padding: 20px 22px;
  }
}

.page-about .ab-region-panel {
  margin-top: 22px;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  background: var(--c-white);
  box-shadow: var(--shadow-1);
}

.page-about .ab-region-panel__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  padding-bottom: 20px;
  border-bottom: 1px dashed var(--c-line);
}

.page-about .ab-region-panel__stat {
  display: grid;
  gap: 5px;
}

.page-about .ab-region-panel__stat .mono {
  font-size: clamp(1.375rem, 3vw, 1.75rem);
  font-weight: 700;
  line-height: 1;
  color: var(--c-ink);
}

.page-about .ab-region-panel__stat small {
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--c-ink-soft);
}

.page-about .ab-region-panel__body {
  display: grid;
  gap: 18px;
  padding-top: 22px;
}

.page-about .ab-region-panel__body p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--c-ink-soft);
}

@media (min-width: 720px) {
  .page-about .ab-region-panel__body {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: 30px;
  }
}

.page-about .ab-city-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .ab-city-list li {
  padding: 5px 11px;
  font-size: .8125rem;
  line-height: 1.5;
  color: var(--c-ink);
  border: 1px solid var(--c-line);
  border-radius: 6px;
  background: var(--c-sand);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  padding-block: clamp(56px, 8vw, 104px);
  border-block: 1px solid var(--c-line);
}

.page-about .ab-roles {
  display: grid;
  gap: 16px;
  margin-top: clamp(30px, 4vw, 52px);
}

.page-about .ab-role {
  padding: 26px 24px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-white);
  box-shadow: var(--shadow-1);
  transition: transform 180ms ease-out, box-shadow 180ms ease-out, border-color 180ms ease-out;
}

.page-about .ab-role:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
  border-color: var(--c-apricot);
}

.page-about .ab-role__num {
  display: block;
  font-size: clamp(2rem, 4.5vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-leaf-deep);
}

.page-about .ab-role__plus {
  color: var(--c-apricot);
}

.page-about .ab-role .card-title {
  margin: 16px 0 10px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .ab-role .card-text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.82;
  color: var(--c-ink-soft);
}

@media (min-width: 720px) {
  .page-about .ab-roles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }
  .page-about .ab-role:nth-child(2) {
    margin-top: 36px;
  }
  .page-about .ab-role:nth-child(3) {
    margin-top: 14px;
  }
}

.page-about .ab-team__figure {
  margin: clamp(36px, 5vw, 60px) 0 0;
}

/* ---------- 资质 ---------- */
.page-about .ab-cert {
  padding-block: clamp(56px, 8vw, 104px);
}

.page-about .ab-cert__grid {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
}

.page-about .ab-cert__copy h2 {
  margin: 14px 0 0;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.5rem, 2.8vw, 2.25rem);
  line-height: 1.3;
  max-width: 20em;
}

.page-about .ab-cert__list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .ab-cert__list li {
  display: grid;
  gap: 8px;
  padding: 22px 0;
  border-top: 1px solid var(--c-line);
}

.page-about .ab-cert__list li:last-child {
  border-bottom: 1px solid var(--c-line);
}

.page-about .ab-cert__list h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--c-leaf-deep);
}

.page-about .ab-cert__list h3::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--c-apricot);
}

.page-about .ab-cert__list p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--c-ink-soft);
}

.page-about .ab-cert__figure {
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .ab-cert__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
}

/* ---------- 服务承诺 ---------- */
.page-about .ab-review {
  padding-block: clamp(56px, 8vw, 104px);
  border-block: 1px solid var(--c-line);
}

.page-about .ab-review__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .ab-review__intro h2 {
  margin: 14px 0 0;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.5rem, 2.8vw, 2.25rem);
  line-height: 1.3;
}

.page-about .ab-review__intro p {
  margin: 18px 0 0;
  max-width: 44ch;
  font-size: .9375rem;
  line-height: 1.9;
  color: var(--c-ink-soft);
}

.page-about .ab-review__folds {
  display: grid;
  gap: 12px;
}

.page-about .ab-review__folds .fold {
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  background: var(--c-white);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

.page-about .ab-review__folds .fold[open] {
  border-color: var(--c-line-strong);
}

.page-about .ab-review__folds .fold summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 22px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-ink);
  cursor: pointer;
  list-style: none;
}

.page-about .ab-review__folds .fold summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-review__folds .fold summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  line-height: 1;
  color: var(--c-apricot);
  transition: transform 220ms ease-out;
}

.page-about .ab-review__folds .fold[open] summary::after {
  transform: rotate(45deg);
}

.page-about .ab-review__folds .fold summary:focus-visible {
  outline: 2px solid var(--c-sun);
  outline-offset: -2px;
}

.page-about .ab-review__folds .fold-body {
  padding: 0 22px 20px;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--c-ink-soft);
}

.page-about .ab-review__folds .fold-body p {
  margin: 0;
}

@media (min-width: 960px) {
  .page-about .ab-review__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: 56px;
  }
}

/* ---------- 结尾行动区 ---------- */
.page-about .ab-cta {
  padding-block: clamp(52px, 7vw, 88px);
  background: var(--c-ink);
  color: var(--c-cream);
}

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

.page-about .ab-cta h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(1.5rem, 3vw, 2.125rem);
  line-height: 1.28;
  color: var(--c-white);
}

.page-about .ab-cta p {
  margin: 16px 0 0;
  max-width: 52ch;
  font-size: .9375rem;
  line-height: 1.9;
  color: rgba(251, 247, 240, .78);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-cta :focus-visible {
  outline: 2px solid var(--c-sun);
  outline-offset: 2px;
}

@media (min-width: 900px) {
  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    gap: 40px;
  }
  .page-about .ab-cta__actions {
    justify-content: flex-end;
  }
}

/* ---------- 无障碍 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}