.page-about {
  background: var(--paper-dim);
  color: var(--ink);
  font-family: var(--font-body);
  padding-bottom: 0;
}

.page-about p {
  overflow-wrap: break-word;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 30px 0 38px;
  background:
    linear-gradient(180deg, #EFE7D6 0%, var(--paper-dim) 100%);
  border-bottom: 1px solid rgba(122, 85, 34, .38);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: repeating-linear-gradient(90deg, var(--copper-dark) 0 2px, transparent 2px 16px);
  opacity: .45;
  pointer-events: none;
}

.page-about .ab-hero-inner {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .ab-h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(29px, 5.6vw, 56px);
  line-height: 1.1;
  letter-spacing: -.012em;
  margin: 2px 0 0;
  max-width: 22em;
  color: var(--ink);
}

.page-about .ab-lede {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: rgba(11, 12, 14, .8);
}

.page-about .ab-hero-facts {
  list-style: none;
  margin: 10px 0 0;
  padding: 16px 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 18px;
  border-top: 1px dashed rgba(122, 85, 34, .42);
}

.page-about .ab-hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.page-about .ab-fact-num {
  font-family: var(--font-data);
  font-size: clamp(23px, 3.8vw, 34px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--copper-dark);
}

.page-about .ab-fact-label {
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--steel);
  line-height: 1.5;
}

/* ---------- 双栏骨架 ---------- */
.page-about .ab-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  padding-top: 6px;
  padding-bottom: 56px;
}

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

.page-about .ab-side-sticky {
  padding-bottom: 20px;
  border-bottom: 1px dashed rgba(122, 85, 34, .42);
}

.page-about .ab-side-title {
  margin: 0 0 10px;
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--copper-dark);
}

.page-about .ab-side-list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
}

.page-about .ab-side-link {
  font-size: 13px;
  color: #4A443B;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-side-link:hover,
.page-about .ab-side-link:focus-visible {
  color: var(--copper-dark);
  border-bottom-color: var(--copper);
}

.page-about .ab-side-codes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 7px 14px;
  font-size: 12.5px;
  color: rgba(11, 12, 14, .7);
}

.page-about .ab-mini-code {
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--copper-dark);
  margin-right: 6px;
}

.page-about .ab-main {
  min-width: 0;
  padding-top: 8px;
}

/* ---------- 通用区块 ---------- */
.page-about .ab-sec {
  padding: 34px 0 38px;
  border-bottom: 1px dashed rgba(122, 85, 34, .42);
}

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

.page-about .section-label {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--copper-dark);
}

.page-about .section-label::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  min-width: 24px;
  background: repeating-linear-gradient(90deg, rgba(122, 85, 34, .55) 0 4px, transparent 4px 10px);
}

.page-about .section-label-index {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--ink);
  background: var(--copper);
  padding: 2px 6px;
  border-radius: 1px;
}

.page-about .ab-h2 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(21px, 3.2vw, 33px);
  line-height: 1.22;
  letter-spacing: -.006em;
  margin: 12px 0 0;
  max-width: 26em;
}

.page-about .ab-h3 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(16px, 2.1vw, 20px);
  line-height: 1.35;
  margin: 0 0 6px;
  color: inherit;
}

.page-about .ab-lead-p {
  margin: 16px 0 0;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(11, 12, 14, .8);
}

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

.page-about .ab-prose p {
  margin: 0 0 14px;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(11, 12, 14, .8);
}

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

.page-about .ab-note {
  margin: 22px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(122, 85, 34, .35);
  max-width: 70ch;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(11, 12, 14, .72);
}

.page-about .ab-inline-link {
  color: var(--copper-dark);
  text-decoration: none;
  border-bottom: 1px solid var(--copper);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-inline-link:hover,
.page-about .ab-inline-link:focus-visible {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

/* ---------- 图文两栏 ---------- */
.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 22px;
}

.page-about .ab-split > * {
  min-width: 0;
}

/* ---------- 图片外框 ---------- */
.page-about .ab-figure {
  margin: 0;
}

.page-about .media-frame {
  margin: 0;
  padding: 8px;
  background: #EFE7D6;
  border: 1px solid rgba(122, 85, 34, .5);
  border-radius: var(--radius);
  box-shadow: 3px 3px 0 rgba(122, 85, 34, .16);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 1px;
  filter: saturate(.55) contrast(1.06);
}

.page-about .media-frame-caption {
  margin: 9px 2px 2px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 人力条形图 ---------- */
.page-about .ab-bars-wrap {
  min-width: 0;
}

.page-about .ab-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 13px;
}

.page-about .ab-bar {
  display: grid;
  grid-template-columns: 82px minmax(0, 1fr) 32px;
  align-items: center;
  gap: 10px;
}

.page-about .ab-bar-label {
  font-size: 12.5px;
  color: rgba(11, 12, 14, .78);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .ab-bar-track {
  display: block;
  position: relative;
  height: 14px;
  background: rgba(122, 85, 34, .13);
  border-left: 1px solid rgba(122, 85, 34, .55);
  overflow: hidden;
}

.page-about .ab-bar-fill {
  display: block;
  height: 100%;
  transition: filter .18s var(--ease);
}

.page-about .ab-bar:hover .ab-bar-fill,
.page-about .ab-bar:focus-within .ab-bar-fill {
  filter: brightness(1.14);
}

.page-about .ab-bar-num {
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 700;
  text-align: right;
  color: var(--ink);
}

.page-about .ab-fill--copper { background: var(--copper); }
.page-about .ab-fill--steel { background: var(--steel); }
.page-about .ab-fill--cinnabar { background: var(--cinnabar); }
.page-about .ab-fill--indigo { background: var(--indigo); }
.page-about .ab-fill--copper-dark { background: var(--copper-dark); }
.page-about .ab-fill--steel-lit { background: #6E8EA3; }

/* ---------- 业务组列表 ---------- */
.page-about .ab-groups {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  border-top: 1px solid rgba(122, 85, 34, .42);
}

.page-about .ab-groups > li {
  border-bottom: 1px solid rgba(122, 85, 34, .42);
}

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

.page-about .ab-group-sum {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr) auto 18px;
  align-items: center;
  gap: 10px;
  padding: 14px 10px;
  cursor: pointer;
  list-style: none;
  transition: background-color .18s var(--ease), color .18s var(--ease);
}

.page-about .ab-group-sum::-webkit-details-marker {
  display: none;
}

.page-about .ab-group-sum:hover,
.page-about .ab-group-sum:focus-visible {
  background: var(--ink-panel);
  color: var(--paper);
  outline: none;
}

.page-about .ab-group-code {
  font-family: var(--font-data);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: .05em;
  text-align: center;
  padding: 3px 5px;
  color: var(--copper-dark);
  background: rgba(192, 138, 62, .12);
  border: 1px solid rgba(122, 85, 34, .55);
  border-radius: 1px;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .ab-group-sum:hover .ab-group-code {
  color: var(--copper-lit);
  border-color: var(--copper-lit);
  background: rgba(227, 184, 113, .12);
}

.page-about .ab-group-name {
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .ab-group-count {
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--steel);
  white-space: nowrap;
  transition: color .18s var(--ease);
}

.page-about .ab-group-sum:hover .ab-group-count {
  color: rgba(242, 237, 227, .75);
}

.page-about .ab-group-glyph {
  font-family: var(--font-data);
  font-size: 16px;
  line-height: 1;
  text-align: center;
  color: var(--copper-dark);
  transition: transform .18s var(--ease), color .18s var(--ease);
}

.page-about .ab-group-sum:hover .ab-group-glyph {
  color: var(--copper-lit);
}

.page-about .ab-group[open] .ab-group-glyph {
  transform: rotate(45deg);
}

.page-about .ab-group-body {
  padding: 2px 12px 18px;
  max-width: 72ch;
}

.page-about .ab-group-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(11, 12, 14, .78);
}

/* ---------- 深墨反转区块 ---------- */
.page-about .ab-sec--dark {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  border-bottom: 1px solid var(--copper-dark);
  border-radius: var(--radius);
  box-shadow: inset 0 0 0 1px rgba(192, 138, 62, .22);
  padding: 32px 20px 36px;
  margin: 20px 0;
}

.page-about .ab-sec--dark::after {
  content: "";
  position: absolute;
  top: 10px;
  right: 10px;
  width: 22px;
  height: 22px;
  border-top: 1px solid var(--copper);
  border-right: 1px solid var(--copper);
  pointer-events: none;
}

.page-about .ab-sec--dark .section-label {
  color: var(--copper-lit);
}

.page-about .ab-sec--dark .section-label::after {
  background: repeating-linear-gradient(90deg, rgba(192, 138, 62, .6) 0 4px, transparent 4px 10px);
}

.page-about .ab-sec--dark .ab-prose p {
  color: rgba(242, 237, 227, .82);
}

.page-about .ab-points {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .ab-points li {
  padding-top: 12px;
  border-top: 1px solid rgba(192, 138, 62, .42);
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(242, 237, 227, .82);
}

.page-about .ab-points strong {
  display: block;
  font-family: var(--font-data);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: .02em;
  color: var(--copper-lit);
  margin-bottom: 8px;
}

.page-about .ab-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 26px;
}

.page-about .ab-eco-cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 14px 16px;
  background: var(--ink-panel);
  border-left: 2px solid var(--copper);
  border-radius: var(--radius);
}

.page-about .ab-eco-num {
  font-family: var(--font-data);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--copper-lit);
}

.page-about .ab-eco-label {
  font-size: 13px;
  line-height: 1.65;
  color: rgba(242, 237, 227, .72);
}

/* ---------- 发展脉络 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 8px;
  width: 1px;
  background: repeating-linear-gradient(180deg, rgba(122, 85, 34, .7) 0 6px, transparent 6px 12px);
}

.page-about .ab-node {
  position: relative;
  padding-bottom: 24px;
}

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

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 10px;
  height: 10px;
  box-sizing: border-box;
  background: var(--paper-dim);
  border: 2px solid var(--copper-dark);
  border-radius: 50%;
}

.page-about .ab-node-stage {
  margin: 0 0 4px;
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--copper-dark);
}

.page-about .ab-node p:not(.ab-node-stage) {
  margin: 0;
  max-width: 66ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(11, 12, 14, .78);
}

/* ---------- 对接入口 ---------- */
.page-about .ab-routes {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .ab-route {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: 18px 16px 20px;
  background: #EFE7D6;
  border: 1px solid rgba(122, 85, 34, .42);
  border-top: 3px solid var(--copper);
  border-radius: var(--radius);
  box-shadow: 2px 2px 0 rgba(122, 85, 34, .12);
}

.page-about .ab-route--verify { border-top-color: var(--cinnabar); }
.page-about .ab-route--price { border-top-color: var(--steel); }
.page-about .ab-route--query { border-top-color: var(--copper); }

.page-about .ab-route-code {
  font-family: var(--font-data);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--copper-dark);
}

.page-about .ab-route p {
  margin: 0;
  flex: 1 1 auto;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(11, 12, 14, .78);
}

.page-about .ab-route-btn {
  align-self: flex-start;
  text-decoration: none;
  margin-top: 4px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .ab-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px 22px;
  }

  .page-about .ab-bar {
    grid-template-columns: 108px minmax(0, 1fr) 38px;
    gap: 12px;
  }

  .page-about .ab-bar-label {
    font-size: 13px;
  }

  .page-about .ab-group-sum {
    grid-template-columns: 70px minmax(0, 1fr) auto 22px;
    gap: 14px;
    padding: 15px 12px;
  }

  .page-about .ab-group-body {
    padding: 2px 16px 20px 96px;
  }

  .page-about .ab-eco {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .ab-sec--dark {
    padding: 40px 36px 44px;
  }

  .page-about .ab-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
  }

  .page-about .ab-eco {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-routes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-hero {
    padding: 40px 0 46px;
  }

  .page-about .ab-shell {
    grid-template-columns: 200px minmax(0, 1fr);
    column-gap: 48px;
    padding-top: 34px;
    padding-bottom: 72px;
  }

  .page-about .ab-side-sticky {
    position: sticky;
    top: 28px;
    padding-bottom: 0;
    border-bottom: 0;
    border-left: 2px solid var(--copper-dark);
    padding-left: 16px;
  }

  .page-about .ab-side-list {
    display: block;
    margin-bottom: 26px;
  }

  .page-about .ab-side-list li + li {
    margin-top: 9px;
  }

  .page-about .ab-side-codes {
    display: block;
  }

  .page-about .ab-side-codes li + li {
    margin-top: 8px;
  }

  .page-about .ab-main {
    padding-top: 0;
  }

  .page-about .ab-sec {
    padding: 40px 0 44px;
  }

  .page-about .ab-sec--dark {
    padding: 46px 44px 50px;
    margin: 28px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-bar-fill,
  .page-about .ab-group-sum,
  .page-about .ab-group-glyph,
  .page-about .ab-side-link,
  .page-about .ab-inline-link {
    transition: none;
  }
}