.page-about {
  --ab-rail-w: 178px;
  --ab-gap: clamp(24px, 4vw, 40px);
  background: var(--paper);
  color: var(--ink);
  padding-bottom: clamp(56px, 9vw, 120px);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: clamp(22px, 3.5vw, 34px) 0 clamp(16px, 3vw, 28px);
}

/* ---------- 首屏：叙事 + 阶段阶梯 ---------- */
.page-about .ab-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 52px);
  padding-bottom: clamp(34px, 6vw, 64px);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero__kicker {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}

.page-about .ab-hero h1 {
  margin: 0;
  max-width: 22ch;
  font-size: clamp(30px, 5.4vw, 52px);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .ab-hero__text {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .ab-hero__keys {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 10px;
}

.page-about .ab-hero__keys li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border: 1px solid var(--line);
  background: var(--paper-2);
  font-size: 13px;
  color: var(--ink-soft);
}

.page-about .ab-hero__keys .mono {
  font-size: 13px;
  color: var(--blue-mid);
}

.page-about .ab-hero__visual {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 22px;
  min-height: 240px;
  padding: clamp(20px, 4vw, 32px);
  border: 1px solid var(--blue-line);
  background: var(--blue-deep);
}

.page-about .ab-stair {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .ab-stair__row {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
}

.page-about .ab-stair__row:nth-child(1) { max-width: 42%; }
.page-about .ab-stair__row:nth-child(2) { max-width: 56%; }
.page-about .ab-stair__row:nth-child(3) { max-width: 70%; }
.page-about .ab-stair__row:nth-child(4) { max-width: 84%; }
.page-about .ab-stair__row:nth-child(5) { max-width: 100%; }

.page-about .ab-stair__idx {
  flex: 0 0 auto;
  width: 22px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(247, 245, 240, 0.5);
}

.page-about .ab-stair__bar {
  flex: 1 1 auto;
  height: 9px;
}

.page-about .ab-stair__row:nth-child(1) .ab-stair__bar { background: rgba(247, 245, 240, 0.16); }
.page-about .ab-stair__row:nth-child(2) .ab-stair__bar { background: rgba(247, 245, 240, 0.30); }
.page-about .ab-stair__row:nth-child(3) .ab-stair__bar { background: rgba(247, 245, 240, 0.48); }
.page-about .ab-stair__row:nth-child(4) .ab-stair__bar { background: rgba(247, 245, 240, 0.70); }
.page-about .ab-stair__row:nth-child(5) .ab-stair__bar { background: var(--paper-2); }

.page-about .ab-stair__cap {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(247, 245, 240, 0.48);
}

/* ---------- 主体骨架：内容 + 编号索带 ---------- */
.page-about .ab-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding-top: clamp(28px, 5vw, 52px);
}

.page-about .ab-rail {
  display: flex;
  flex-direction: row;
  gap: 8px;
  overflow-x: auto;
  padding: 0 0 10px;
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}

.page-about .ab-rail .num-rail__item {
  flex: 0 0 auto;
  white-space: nowrap;
}

.page-about .ab-main {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .ab-section {
  padding: clamp(34px, 5vw, 64px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

.page-about .ab-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .section-label {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .ab-prose {
  margin-top: clamp(16px, 2.5vw, 24px);
}

.page-about .ab-prose p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-soft);
}

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

.page-about .ab-prose--tight p {
  font-size: 15px;
}

.page-about .ab-prose a {
  color: var(--blue-mid);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 0 0 clamp(24px, 4vw, 38px);
}

.page-about .ab-figure .media-frame__img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .ab-figure--staff {
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .ab-figure--net {
  margin-top: clamp(24px, 4vw, 36px);
}

/* ---------- 沿革时间带 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-tl {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 40px) 46px;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 34px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-about .ab-tl:last-child::before {
  display: none;
}

.page-about .ab-tl__marker {
  position: absolute;
  left: 0;
  top: 0;
  width: 31px;
  height: 31px;
  display: grid;
  place-items: center;
  background: var(--paper);
  border: 1px solid var(--blue);
  color: var(--blue);
  font-size: 12px;
  letter-spacing: 0.02em;
}

.page-about .ab-tl__stamp {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}

.page-about .ab-tl__title {
  margin: 0;
  font-size: clamp(19px, 2.4vw, 24px);
  line-height: 1.3;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .ab-tl__lede {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .ab-tl__label {
  margin-top: 16px;
}

.page-about .ab-tl__panel {
  margin-top: 14px;
}

/* 折叠面板兜底样式 */
.page-about .panel {
  border: 1px solid var(--line);
  background: var(--paper);
}

.page-about .panel__head {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 10px 14px;
  border: 0;
  background: transparent;
  font: inherit;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease);
}

.page-about .panel__head:hover {
  background: var(--paper-2);
}

.page-about .panel__head:focus-visible {
  outline: 2px solid var(--blue-mid);
  outline-offset: -2px;
}

.page-about .panel__key {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}

.page-about .panel__title {
  flex: 1 1 auto;
  font-size: 14px;
  color: var(--ink);
}

.page-about .panel__body {
  padding: 4px 14px 16px;
  border-top: 1px solid var(--line);
}

.page-about .panel__body p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* 制度注记条 */
.page-about .ab-tl-note {
  list-style: none;
  margin: 0 0 clamp(26px, 4vw, 40px) 46px;
  padding: 14px 16px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--blue-soft);
}

.page-about .ab-tl-note__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .ab-tl-note__key {
  display: inline-block;
  margin-right: 10px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--blue-mid);
}

/* ---------- 四类前缀卡片 ---------- */
.page-about .ab-code-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .ab-code {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 22px 22px;
  border: 1px solid var(--line);
  background: var(--paper);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-code:hover {
  border-color: var(--blue-mid);
  background: var(--paper-2);
}

.page-about .ab-code__key {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--blue-mid);
}

.page-about .ab-code__name {
  margin: 0;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .ab-code__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .ab-code__term {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: auto 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  color: var(--ink);
}

.page-about .ab-code__term .mono {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}

/* ---------- 人员规模 ---------- */
.page-about .ab-staff {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 36px);
}

.page-about .ab-staff__figure {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0;
}

.page-about .ab-staff__num {
  font-size: clamp(56px, 11vw, 96px);
  line-height: 0.88;
  font-weight: 400;
  letter-spacing: -0.03em;
  color: var(--blue);
}

.page-about .ab-staff__unit {
  font-size: 15px;
  color: var(--ink-soft);
}

.page-about .ab-staff__cap {
  margin: 14px 0 0;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .ab-scale {
  display: flex;
  gap: 2px;
  height: 18px;
  padding: 2px;
  border: 1px solid var(--line);
  background: var(--paper-2);
}

.page-about .ab-scale__seg {
  display: block;
}

.page-about .ab-scale__seg--a { flex: 21 1 0; background: var(--blue); }
.page-about .ab-scale__seg--b { flex: 96 1 0; background: var(--blue-mid); }
.page-about .ab-scale__seg--c { flex: 118 1 0; background: var(--blue-soft); }
.page-about .ab-scale__seg--d { flex: 33 1 0; background: var(--line-strong); }

.page-about .ab-staff__legend {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .ab-staff__legend li {
  display: grid;
  grid-template-columns: 12px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
}

.page-about .ab-swatch {
  width: 10px;
  height: 10px;
}

.page-about .ab-swatch--a { background: var(--blue); }
.page-about .ab-swatch--b { background: var(--blue-mid); }
.page-about .ab-swatch--c { background: var(--blue-soft); border: 1px solid var(--line-strong); }
.page-about .ab-swatch--d { background: var(--line-strong); }

.page-about .ab-staff__name {
  color: var(--ink);
}

.page-about .ab-staff__count {
  font-size: 15px;
  color: var(--blue);
}

/* ---------- 门店分布 ---------- */
.page-about .ab-touch__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
  padding: 18px 20px;
  border: 1px solid var(--blue);
  background: var(--blue-soft);
  margin-bottom: clamp(20px, 3.5vw, 30px);
}

.page-about .ab-touch__total {
  font-size: clamp(34px, 6vw, 52px);
  line-height: 0.9;
  color: var(--blue);
}

.page-about .ab-touch__text {
  margin: 0;
  flex: 1 1 240px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .ab-touch__text .mono {
  color: var(--blue);
}

.page-about .ab-city {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px;
}

.page-about .ab-city__item {
  padding: 14px;
  border: 1px solid var(--line);
  background: var(--paper);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-city__item:hover {
  border-color: var(--blue-mid);
  background: var(--paper-2);
}

.page-about .ab-city__label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-about .ab-city__name {
  font-size: 15px;
  font-weight: 700;
}

.page-about .ab-city__n {
  font-size: 13px;
  color: var(--blue-mid);
}

.page-about .ab-city__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, 10px);
  gap: 4px;
  margin-top: 12px;
}

.page-about .ab-city__grid span {
  width: 10px;
  height: 10px;
  background: var(--blue);
}

.page-about .ab-outside {
  margin-top: 20px;
  padding: 16px 18px;
  border: 1px dashed var(--line-strong);
}

.page-about .ab-outside__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
}

.page-about .ab-outside__title {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
}

.page-about .ab-outside__n {
  font-size: 13px;
  color: var(--blue-mid);
}

.page-about .ab-outside__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, 10px);
  gap: 4px;
  margin-top: 12px;
}

.page-about .ab-outside__grid span {
  width: 10px;
  height: 10px;
  background: var(--blue-mid);
}

/* ---------- 联系方式 ---------- */
.page-about .ab-contact {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-contact__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 4px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-contact__key {
  grid-column: 1;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
}

.page-about .ab-contact__val {
  grid-column: 1;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.page-about .ab-contact__copy {
  grid-column: 2;
  grid-row: 1 / -1;
  align-self: center;
}

/* ---------- 可溯源层级 ---------- */
.page-about .ab-trace {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-trace__item {
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .ab-trace__key {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--blue-mid);
}

.page-about .ab-trace__text {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 行动点 ---------- */
.page-about .ab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.5vw, 32px);
}

/* ---------- 桌面断点 ---------- */
@media (min-width: 760px) {
  .page-about .ab-code-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 24px;
  }

  .page-about .ab-code:nth-child(even) {
    margin-top: 30px;
  }

  .page-about .ab-staff__legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px 28px;
  }
}

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

  .page-about .ab-hero__visual {
    min-height: 320px;
  }

  .page-about .ab-tl {
    padding-left: 66px;
  }

  .page-about .ab-tl-note {
    margin-left: 66px;
  }

  .page-about .ab-staff {
    grid-template-columns: minmax(0, 3fr) minmax(0, 7fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-shell {
    grid-template-columns: minmax(0, 1fr) var(--ab-rail-w);
    gap: clamp(30px, 4vw, 54px);
    align-items: start;
  }

  .page-about .ab-main {
    grid-column: 1;
    grid-row: 1;
    min-width: 0;
  }

  .page-about .ab-rail {
    grid-column: 2;
    grid-row: 1;
    flex-direction: column;
    gap: 0;
    overflow: visible;
    position: sticky;
    top: 96px;
    padding: 0 0 0 18px;
    border-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .ab-rail .num-rail__item {
    display: block;
    padding: 9px 0;
    white-space: normal;
    font-size: 13px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-code,
  .page-about .ab-city__item,
  .page-about .panel__head {
    transition: none;
  }
}