.page-about {
  --ab-rail-x: 13px;
  --ab-watermark: rgba(140, 59, 34, .07);
  --ab-ink-soft: rgba(244, 239, 230, .72);
  --ab-line-dark: rgba(244, 239, 230, .18);
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .ab-crumb {
  padding-top: 20px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 46px) 0 clamp(34px, 5vw, 64px);
  border-bottom: 1px solid var(--bd-rule);
  background:
    radial-gradient(110% 78% at 96% 2%, rgba(255, 154, 31, .13), transparent 58%),
    linear-gradient(180deg, var(--bd-paper-3) 0%, var(--bd-paper) 52%, var(--bd-paper-2) 100%);
}

.page-about .ab-hero__mark {
  position: absolute;
  right: -3%;
  bottom: -16%;
  font-family: var(--bd-serif);
  font-weight: 900;
  font-size: clamp(130px, 25vw, 300px);
  line-height: .76;
  letter-spacing: -.04em;
  color: var(--ab-watermark);
  pointer-events: none;
  user-select: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .ab-hero h1 {
  margin: 14px 0 0;
  font-family: var(--bd-serif);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 54px);
  line-height: 1.22;
  letter-spacing: -.012em;
  color: var(--bd-ink);
}

.page-about .ab-hero__sub {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--bd-body);
}

.page-about .ab-hero__facts {
  margin: 30px 0 0;
  padding: 0;
  border-top: 1px solid var(--bd-rule);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 18px;
}

.page-about .ab-fact {
  padding: 14px 0 12px;
  border-bottom: 1px solid var(--bd-rule);
}

.page-about .ab-fact dt {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--bd-muted);
}

.page-about .ab-fact dd {
  margin: 6px 0 0;
  font-size: 19px;
  font-weight: 600;
  color: var(--bd-ink);
}

/* 刻印徽章 */
.page-about .ab-hero__seal {
  position: relative;
  padding: 24px 22px 22px;
  background: var(--bd-paper-3);
  border: 1px solid var(--bd-rule);
  border-radius: var(--bd-r-md);
  box-shadow: var(--bd-shadow);
}

.page-about .ab-hero__seal::before {
  content: '';
  position: absolute;
  inset: 8px -8px -8px 8px;
  border: 1px solid var(--bd-rule);
  border-radius: var(--bd-r-md);
  background: var(--bd-paper-2);
  z-index: -1;
}

.page-about .ab-seal__ring {
  display: block;
  width: 74px;
  height: 74px;
  color: var(--bd-ochre);
}

.page-about .ab-seal__ring svg {
  display: block;
  width: 100%;
  height: 100%;
}

.page-about .ab-seal__ring circle {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
}

.page-about .ab-seal__ring circle:last-child {
  stroke-dasharray: 3 5;
  opacity: .72;
}

.page-about .ab-seal__k {
  margin: 14px 0 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--bd-muted);
}

.page-about .ab-seal__v {
  margin: 4px 0 0;
  font-size: 30px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--bd-ochre);
}

.page-about .ab-seal__issue {
  margin: 2px 0 0;
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--bd-ink);
}

.page-about .ab-seal__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--bd-rule);
  font-size: 13px;
  line-height: 1.7;
  color: var(--bd-muted);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-line {
  margin-top: 30px;
}

.page-about .ab-line__list {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-line__list::before {
  content: '';
  position: absolute;
  left: var(--ab-rail-x);
  top: 12px;
  bottom: 20px;
  width: 2px;
  background: repeating-linear-gradient(to bottom, var(--bd-rule) 0 7px, transparent 7px 13px);
}

.page-about .ab-node {
  position: relative;
  padding: 0 0 clamp(30px, 4vw, 44px) 44px;
}

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

.page-about .ab-node::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 7px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bd-paper);
  border: 2px solid var(--bd-ochre);
  box-sizing: border-box;
}

.page-about .ab-node--now::before {
  background: var(--bd-amber);
  border-color: var(--bd-amber);
  box-shadow: 0 0 0 5px rgba(255, 154, 31, .18);
}

.page-about .ab-node__year {
  display: inline-block;
  margin-bottom: 10px;
  padding-bottom: 2px;
  font-size: clamp(21px, 2.6vw, 30px);
  font-weight: 600;
  letter-spacing: .06em;
  color: var(--bd-ochre);
  border-bottom: 2px solid rgba(140, 59, 34, .24);
}

.page-about .ab-node--now .ab-node__year {
  color: var(--bd-ink);
  border-bottom-color: var(--bd-amber);
}

.page-about .ab-node__body h3 {
  margin: 0;
  font-family: var(--bd-serif);
  font-size: 21px;
  line-height: 1.45;
  color: var(--bd-ink);
}

.page-about .ab-node__body > p {
  margin: 10px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--bd-body);
}

.page-about .ab-node__more {
  margin-top: 14px;
  padding-left: 14px;
  border-left: 2px solid var(--bd-rule);
}

.page-about .ab-node__more > summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--bd-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--bd-muted);
}

.page-about .ab-node__more > summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-node__more > summary::before {
  content: '+ ';
  color: var(--bd-ochre);
}

.page-about .ab-node__more[open] > summary::before {
  content: '– ';
}

.page-about .ab-node__more > p {
  margin: 8px 0 0;
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--bd-muted);
}

.page-about .ab-node__fig {
  margin-top: 18px;
  max-width: 100%;
}

.page-about .ab-node__fig .bd-figure__frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 分工表 ---------- */
.page-about .ab-table-wrap {
  margin-top: 26px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-table {
  width: 100%;
  min-width: 580px;
  border-collapse: collapse;
  background: var(--bd-paper-3);
  border: 1px solid var(--bd-rule);
  font-size: 15px;
  line-height: 1.75;
}

.page-about .ab-table caption {
  caption-side: top;
  padding-bottom: 10px;
  text-align: left;
  font-family: var(--bd-mono);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--bd-muted);
}

.page-about .ab-table th,
.page-about .ab-table td {
  padding: 14px 15px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--bd-rule);
  color: var(--bd-body);
}

.page-about .ab-table thead th {
  background: var(--bd-ochre);
  color: var(--bd-paper);
  font-family: var(--bd-serif);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .03em;
  border-bottom: 1px solid var(--bd-ochre-2);
}

.page-about .ab-table tbody th {
  font-weight: 700;
  color: var(--bd-ink);
  white-space: nowrap;
}

.page-about .ab-table tbody tr {
  transition: background-color .18s ease;
}

.page-about .ab-table tbody tr:hover {
  background: var(--bd-paper-2);
}

.page-about .ab-table .ab-num {
  font-size: 20px;
  font-weight: 600;
  color: var(--bd-ochre);
  white-space: nowrap;
}

.page-about .ab-table tfoot th,
.page-about .ab-table tfoot td {
  background: var(--bd-paper-2);
  border-bottom: none;
  font-weight: 600;
  color: var(--bd-ink);
}

/* ---------- 五道环节 ---------- */
.page-about .ab-flow__fig {
  max-width: 620px;
  margin: 0 auto 30px;
}

.page-about .ab-flow__fig .bd-figure__frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-flow__panel {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 46px);
  border-radius: var(--bd-r-lg);
  background: linear-gradient(160deg, var(--bd-ink-deep) 0%, #25313c 58%, #33231a 100%);
  color: var(--bd-paper);
  box-shadow: var(--bd-shadow);
}

.page-about .ab-flow__panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--bd-amber), rgba(255, 154, 31, 0) 72%);
}

.page-about .ab-flow__head .bd-section__title {
  color: var(--bd-paper);
}

.page-about .ab-flow__head .bd-section__hint {
  color: var(--ab-ink-soft);
}

.page-about .ab-steps {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ab-line-dark);
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--ab-line-dark);
}

.page-about .ab-step:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .ab-step__no {
  font-size: 21px;
  font-weight: 600;
  letter-spacing: .05em;
  color: var(--bd-amber);
  line-height: 1.3;
}

.page-about .ab-step h3 {
  margin: 0;
  font-family: var(--bd-serif);
  font-size: 18px;
  color: var(--bd-paper);
}

.page-about .ab-step p {
  margin: 7px 0 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ab-ink-soft);
}

/* ---------- 服务覆盖 ---------- */
.page-about .ab-reach__row {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--bd-rule);
}

.page-about .ab-stat {
  padding: 20px 0;
  border-bottom: 1px solid var(--bd-rule);
}

.page-about .ab-stat__n {
  display: inline-block;
  font-size: clamp(38px, 6vw, 56px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--bd-ochre);
}

.page-about .ab-stat__pct {
  font-size: .5em;
  letter-spacing: 0;
}

.page-about .ab-stat__u {
  display: inline-block;
  margin-left: 10px;
  font-size: 14px;
  color: var(--bd-muted);
}

.page-about .ab-stat p {
  margin: 12px 0 0;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--bd-body);
}

/* ---------- 长期价值 ---------- */
.page-about .ab-reasons {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-reason {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 22px 0;
  border-top: 1px solid var(--bd-rule);
}

.page-about .ab-reason:last-child {
  border-bottom: 1px solid var(--bd-rule);
}

.page-about .ab-reason h3 {
  margin: 0;
  font-family: var(--bd-serif);
  font-size: 20px;
  line-height: 1.5;
  color: var(--bd-ink);
}

.page-about .ab-reason h3::before {
  content: '';
  display: block;
  width: 26px;
  height: 3px;
  margin-bottom: 10px;
  background: var(--bd-amber);
}

.page-about .ab-reason p {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--bd-body);
}

/* ---------- 本地社区 ---------- */
.page-about .ab-community__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 40px);
  align-items: start;
}

.page-about .ab-community__text > p {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--bd-body);
}

.page-about .ab-community__list {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--bd-rule);
}

.page-about .ab-community__list li {
  padding: 13px 0;
  border-bottom: 1px solid var(--bd-rule);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--bd-body);
}

.page-about .ab-community__list .bd-mono {
  display: inline-block;
  min-width: 88px;
  margin-right: 8px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--bd-ochre);
}

.page-about .ab-community__fig {
  margin: 0;
  border: 1px solid var(--bd-rule);
  background: var(--bd-paper-3);
  padding: 10px;
  border-radius: var(--bd-r-sm);
}

.page-about .ab-community__fig .bd-figure__frame {
  overflow: hidden;
}

.page-about .ab-community__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform .36s cubic-bezier(.22, .61, .36, 1);
}

.page-about .ab-community__fig:hover img {
  transform: translate(5px, -5px);
}

.page-about .ab-community__fig .bd-figure__cap {
  padding: 10px 4px 2px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--bd-muted);
}

/* ---------- 结尾指引 ---------- */
.page-about .ab-next__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding: clamp(22px, 3.4vw, 34px);
  border: 1px solid var(--bd-rule);
  border-left: 5px solid var(--bd-tea);
  background: var(--bd-paper-3);
  border-radius: var(--bd-r-md);
}

.page-about .ab-next__text h2 {
  margin: 0;
  font-family: var(--bd-serif);
  font-size: clamp(22px, 3vw, 28px);
  color: var(--bd-ink);
}

.page-about .ab-next__text p {
  margin: 10px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--bd-body);
}

.page-about .ab-next__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-reach__row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 34px;
  }
}

@media (min-width: 860px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.62fr) minmax(248px, 1fr);
  }

  .page-about .ab-community__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }

  .page-about .ab-next__inner {
    grid-template-columns: minmax(0, 1.5fr) auto;
    align-items: center;
  }

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

  .page-about .ab-reason {
    grid-template-columns: minmax(0, 248px) minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .ab-step {
    grid-template-columns: 62px minmax(0, 1fr);
    gap: 22px;
    padding: 22px 0;
  }
}

@media (min-width: 1080px) {
  .page-about .ab-line__list::before {
    left: 15px;
  }

  .page-about .ab-node {
    padding-left: 62px;
  }

  .page-about .ab-node::before {
    left: 8px;
    top: 8px;
  }

  .page-about .ab-node__fig {
    max-width: 640px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-community__fig img,
  .page-about .ab-table tbody tr {
    transition: none;
  }

  .page-about .ab-community__fig:hover img {
    transform: none;
  }
}