.page-about {
  --ab-rule: rgba(11, 26, 51, .14);
  --ab-body: #3C4757;
  background-color: var(--paper);
  color: var(--ink-text);
  background-image:
    linear-gradient(rgba(11, 26, 51, .06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11, 26, 51, .06) 1px, transparent 1px);
  background-size: 96px 96px;
  overflow-x: hidden;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(20px, 3vw, 34px);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: #6B7686;
}

.page-about .breadcrumb a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(11, 26, 51, .28);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--signal);
  border-color: var(--signal);
}

.page-about .lead {
  color: var(--ab-body);
}

/* ---------- hero ---------- */

.ab-hero {
  padding: clamp(26px, 4vw, 52px) 0 clamp(8px, 2vw, 20px);
}

.ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
}

.ab-hero__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(30px, 5.2vw, 54px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--ink);
  margin: 12px 0 18px;
}

.ab-hero__lead {
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.85;
  max-width: 62ch;
  margin: 0;
}

.ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.ab-hero__visual {
  background: var(--ink);
  box-shadow: var(--shadow-hard);
  border-left: 4px solid var(--signal);
}

.ab-hero__svg {
  display: block;
  width: 100%;
  height: auto;
}

.ab-hero__facts {
  list-style: none;
  margin: clamp(30px, 4vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  border-top: 2px solid var(--ink);
  padding-top: 18px;
}

.ab-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  color: var(--ink);
}

.ab-hero__lbl {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: #5A6473;
}

/* ---------- layout ---------- */

.ab-layout {
  padding-bottom: clamp(48px, 7vw, 96px);
}

.ab-rail {
  display: none;
}

.toc-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--stone);
  margin: 0 0 12px;
}

.page-about .toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .toc-link {
  display: block;
  padding: 8px 0 8px 12px;
  font-size: 14px;
  line-height: 1.5;
  color: #55606F;
  text-decoration: none;
  border-left: 2px solid var(--ab-rule);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .toc-link:hover,
.page-about .toc-link:focus-visible {
  color: var(--ink);
  border-left-color: var(--ink);
}

.page-about .toc-link[aria-current="true"] {
  color: var(--signal);
  border-left-color: var(--signal);
  font-weight: 600;
}

/* ---------- chapters ---------- */

.ab-body > .ab-chapter + .ab-chapter {
  margin-top: clamp(40px, 5vw, 76px);
  padding-top: clamp(40px, 5vw, 76px);
  border-top: 1px solid var(--ab-rule);
}

.ab-chapter__head {
  max-width: 74ch;
}

.page-about .index-label {
  color: var(--clay);
}

.ab-chapter__title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.28;
  color: var(--ink);
  margin: 10px 0 14px;
}

.ab-chapter__intro {
  font-size: clamp(16px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--ab-body);
  margin: 0;
}

.ab-chapter__ink {
  background: var(--ink);
  border-left: 4px solid var(--clay);
  box-shadow: var(--shadow-hard);
  padding: clamp(24px, 3.6vw, 50px);
}

.page-about .ab-chapter__ink .index-label {
  color: var(--lime);
}

.page-about .ab-chapter__ink .ab-chapter__title {
  color: var(--text-strong);
}

.page-about .ab-chapter__ink .ab-chapter__intro {
  color: rgba(244, 241, 234, .82);
}

/* ---------- timeline ---------- */

.ab-tl-figure {
  margin: clamp(24px, 3vw, 36px) 0 clamp(28px, 4vw, 46px);
}

.page-about .ab-chapter__ink figcaption {
  color: var(--stone);
}

.ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: rgba(196, 105, 58, .6);
}

.ab-tl-item {
  position: relative;
  padding: 0 0 30px;
}

.ab-tl-item:last-child {
  padding-bottom: 0;
}

.ab-tl-dot {
  position: absolute;
  left: -26px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--clay);
}

.ab-tl-item:last-child .ab-tl-dot {
  background: var(--lime);
  border-color: var(--lime);
}

.ab-tl-stage {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--clay);
  margin: 0 0 6px;
}

.ab-tl-item:last-child .ab-tl-stage {
  color: var(--lime);
}

.ab-tl-title {
  font-family: var(--font-sans);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--text-strong);
  margin: 0 0 8px;
}

.ab-tl-text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: rgba(244, 241, 234, .78);
  max-width: 64ch;
}

/* ---------- services ---------- */

.ab-services {
  list-style: none;
  margin: clamp(26px, 3.5vw, 44px) 0 0;
  padding: 0;
}

.ab-service {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 24px 0;
  border-top: 1px solid var(--ab-rule);
}

.ab-service:last-child {
  border-bottom: 1px solid var(--ab-rule);
}

.ab-service__no {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--signal);
  padding-top: 5px;
}

.ab-service__title {
  font-family: var(--font-serif);
  font-size: 21px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 8px;
}

.ab-service__text {
  margin: 0 0 10px;
  font-size: 16px;
  line-height: 1.82;
  color: var(--ab-body);
  max-width: 66ch;
}

.ab-service__for {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--moss);
  margin: 0;
}

/* ---------- flow ---------- */

.ab-flow {
  list-style: none;
  margin: clamp(26px, 3.5vw, 44px) 0 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.ab-flow li {
  border-top: 2px solid var(--ink);
  padding: 16px 0 0;
}

.ab-flow__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--signal);
  margin-bottom: 10px;
}

.ab-flow h3 {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  margin: 0 0 6px;
}

.ab-flow p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: #46505F;
}

.ab-note {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 16px 0 16px 18px;
  border-left: 3px solid var(--moss);
  background: rgba(78, 107, 87, .08);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-body);
  max-width: 70ch;
}

/* ---------- team ---------- */

.ab-team__grid {
  margin-top: clamp(26px, 3.5vw, 44px);
  display: grid;
  gap: clamp(24px, 3vw, 40px);
}

.ab-team__figure {
  margin: 0;
}

.page-about .ab-team__figure figcaption,
.page-about .ab-renewal__figure figcaption {
  color: var(--stone);
}

.ab-team {
  list-style: none;
  margin: 0;
  padding: 0;
}

.ab-team li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--ab-rule);
}

.ab-team li:last-child {
  border-bottom: 1px solid var(--ab-rule);
}

.ab-team__name {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--ink);
}

.ab-team p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ab-body);
}

/* ---------- renewal ---------- */

.ab-renewal {
  margin-top: clamp(26px, 3.5vw, 44px);
  display: grid;
  gap: clamp(24px, 3vw, 40px);
}

.ab-renewal__figure {
  margin: 0;
}

.ab-renewal__list {
  margin: 0;
  padding: 0;
}

.ab-renewal__row {
  padding: 18px 0;
  border-top: 1px solid var(--ab-rule);
}

.ab-renewal__row:last-child {
  border-bottom: 1px solid var(--ab-rule);
}

.ab-renewal__row dt {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.ab-renewal__row dd {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ab-body);
}

.ab-renewal__foot {
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: #5A6473;
}

/* ---------- hebei ---------- */

.ab-hebei {
  background: var(--moss);
  padding: clamp(24px, 3.6vw, 48px);
  border-left: 4px solid var(--clay);
}

.page-about .ab-hebei .index-label {
  color: var(--lime);
}

.page-about .ab-hebei .ab-chapter__title {
  color: var(--text-strong);
}

.ab-hebei__intro {
  color: rgba(244, 241, 234, .86);
}

.ab-hebei__grid {
  margin-top: clamp(24px, 3vw, 38px);
  display: grid;
  gap: clamp(24px, 3vw, 40px);
}

.ab-hebei__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--lime);
  margin: 0 0 12px;
}

.ab-hebei__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.ab-hebei__list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(244, 241, 234, .9);
}

.ab-hebei__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 1px;
  background: var(--clay);
}

.ab-contact {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.ab-contact li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(244, 241, 234, .18);
}

.ab-contact li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.ab-contact span {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(244, 241, 234, .62);
}

.ab-contact a,
.ab-contact em {
  font-style: normal;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--text-strong);
  text-decoration: none;
  word-break: break-word;
}

.ab-contact a:hover,
.ab-contact a:focus-visible {
  color: var(--lime);
}

.ab-hebei__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 36px);
}

/* ---------- summary ---------- */

.ab-summary {
  margin-top: clamp(26px, 3.5vw, 44px);
  background: var(--ink);
  box-shadow: var(--shadow-hard);
  padding: clamp(24px, 3.6vw, 48px);
}

.ab-summary__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 18px;
}

.ab-summary__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1;
  color: var(--lime);
}

.ab-summary__lbl {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  line-height: 1.62;
  color: var(--text-mute);
}

/* ---------- end ---------- */

.ab-end {
  margin-top: clamp(30px, 4vw, 52px);
  padding-top: clamp(22px, 3vw, 34px);
  border-top: 2px solid var(--ink);
  display: grid;
  gap: 20px;
}

.ab-end__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ab-body);
  max-width: 68ch;
}

.ab-end__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- responsive ---------- */

@media (min-width: 640px) {
  .ab-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .ab-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0;
  }

  .ab-flow li {
    padding: 16px 22px 22px 0;
    border-top: 2px solid var(--ink);
  }

  .ab-flow li:nth-child(n+3) {
    border-top: 1px solid rgba(11, 26, 51, .22);
  }
}

@media (min-width: 760px) {
  .ab-summary__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 30px 22px;
  }

  .ab-team li {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

  .ab-contact li {
    grid-template-columns: 110px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }

  .ab-team__grid,
  .ab-renewal,
  .ab-hebei__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: start;
  }

  .ab-renewal {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }

  .ab-flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .ab-flow li:nth-child(n+3) {
    border-top: 2px solid var(--ink);
  }

  .ab-flow li {
    padding: 16px 24px 0 0;
  }

  .ab-end {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

@media (min-width: 1040px) {
  .ab-hero__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
  }

  .ab-layout {
    display: grid;
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
    align-items: start;
  }

  .ab-rail {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .ab-service {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 22px;
    padding: 28px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .toc-link {
    transition: none;
  }
}