.page-about {
  --ab-rail-w: 210px;
  --ab-gap: 40px;
  --ab-zone-a: #1F5B8F;
  --ab-zone-b: #0F8A72;
  --ab-zone-c: #F2A03D;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .ab-crumb-wrap {
  padding-top: 28px;
  padding-bottom: 8px;
}

.page-about .ab-crumb-wrap .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14px;
  color: var(--muted);
}

.page-about .ab-crumb-wrap .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .ab-crumb-wrap .breadcrumb-link {
  color: var(--blue);
  text-decoration: none;
}

.page-about .ab-crumb-wrap .breadcrumb-link:hover {
  text-decoration: underline;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  padding: 24px 0 56px;
}

.page-about .ab-hero-grid {
  display: grid;
  gap: 32px;
}

.page-about .ab-hero-main h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(32px, 7.4vw, 66px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 16px 0 20px;
}

.page-about .ab-hero-main .lede {
  font-size: 17px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 34em;
  margin: 0;
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-hero-stats {
  list-style: none;
  margin: 0;
  padding: 24px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
  background: var(--navy);
  border-radius: var(--radius-lg);
  color: var(--cream);
}

.page-about .ab-hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .ab-hero-stats .data-figure {
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1.1;
  color: var(--paper);
}

.page-about .ab-stat-label {
  font-size: 13px;
  line-height: 1.5;
  color: rgba(247, 241, 230, 0.72);
}

.page-about .ab-unit {
  font-size: 14px;
  color: var(--amber);
  margin-left: 2px;
}

/* ---------- 区块骨架 ---------- */
.page-about .ab-block {
  padding: 56px 0;
}

.page-about .ab-block--cream {
  background: var(--cream);
}

.page-about .ab-block--paper {
  background: var(--paper);
}

.page-about .ab-block--navy {
  background: var(--navy);
  color: var(--cream);
}

.page-about .ab-chapter {
  display: grid;
  gap: 20px;
}

.page-about .ab-rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .ab-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 34px;
  line-height: 1;
  color: var(--orange);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.page-about .ab-num--inline {
  font-size: 40px;
  color: var(--amber);
}

.page-about .ab-rail-label {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .ab-block--navy .ab-rail-label {
  color: rgba(247, 241, 230, 0.66);
}

.page-about .ab-body--narrow {
  max-width: 38em;
}

.page-about .ab-body .section-title {
  font-family: var(--font-display);
  font-size: 26px;
  line-height: 1.25;
  margin: 0 0 16px;
}

.page-about .ab-body p {
  font-size: 16px;
  line-height: 1.8;
  margin: 0 0 16px;
}

.page-about .ab-figure-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.page-about .ab-figure-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
}

.page-about .ab-figure-item .data-figure {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1.1;
  color: var(--navy);
}

.page-about .ab-figure-label {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

/* ---------- 通用宽幅章节头 ---------- */
.page-about .ab-wide-head {
  display: grid;
  gap: 14px;
  margin-bottom: 32px;
}

.page-about .ab-wide-head .section-title {
  font-family: var(--font-display);
  font-size: clamp(24px, 4.4vw, 34px);
  line-height: 1.2;
  margin: 0 0 12px;
}

.page-about .ab-wide-head .lede {
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0;
  max-width: 40em;
}

.page-about .ab-wide-head--light .section-title {
  color: var(--paper);
}

.page-about .ab-wide-head--light .lede {
  color: rgba(247, 241, 230, 0.76);
}

/* ---------- 服务网络 ---------- */
.page-about .ab-zones {
  display: grid;
  gap: 12px;
}

.page-about .ab-zone {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px;
  border-radius: var(--radius-card);
  background: var(--cream);
  border: 1px solid var(--line);
  border-left: 5px solid var(--ab-zone-a);
}

.page-about .ab-zone--a {
  border-left-color: var(--ab-zone-a);
}

.page-about .ab-zone--b {
  border-left-color: var(--ab-zone-b);
}

.page-about .ab-zone--c {
  border-left-color: var(--ab-zone-c);
}

.page-about .ab-zone-name {
  font-weight: 600;
  font-size: 15px;
  line-height: 1.45;
}

.page-about .ab-zone-time {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--navy);
}

.page-about .ab-zone--b .ab-zone-time {
  color: var(--teal-deep);
}

.page-about .ab-zone--c .ab-zone-time {
  color: var(--orange);
}

.page-about .ab-zone-desc {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .ab-network-foot {
  display: grid;
  gap: 14px;
  margin-top: 28px;
}

.page-about .ab-network-card {
  padding: 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
}

.page-about .ab-network-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .ab-network-card strong {
  color: var(--ink);
}

.page-about .ab-card-kicker {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 12px;
  border-radius: var(--radius-pill);
  background: var(--amber);
  color: var(--ink);
  font-size: 12px;
  letter-spacing: 0.1em;
}

/* ---------- 师傅准入 ---------- */
.page-about .ab-crew-grid {
  display: grid;
  gap: 24px;
}

.page-about .ab-crew-media .media-frame,
.page-about .ab-team-media .media-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--line);
}

.page-about .ab-crew-media img,
.page-about .ab-team-media img,
.page-about .ab-tl-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .ab-check-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-check-list li {
  padding: 12px 16px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .ab-check-key {
  display: inline-block;
  min-width: 6.5em;
  color: var(--navy);
  font-weight: 600;
}

/* ---------- 评价维度 ---------- */
.page-about .ab-dims {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.page-about .ab-dim {
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  overflow: hidden;
  transition: border-color 180ms ease, background-color 180ms ease;
}

.page-about .ab-dim[open] {
  background: var(--paper);
  border-color: var(--blue);
}

.page-about .ab-dim summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .ab-dim-index {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--orange);
}

.page-about .ab-dim-name {
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.2;
  color: var(--navy);
}

.page-about .ab-dim-q {
  flex: 1 1 100%;
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .ab-dim p {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-tl-media {
  margin: 0 0 32px;
}

.page-about .ab-tl-media .media-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--navy-2);
}

.page-about .ab-tl-media .media-caption {
  color: rgba(247, 241, 230, 0.66);
}

.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: 26px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--amber), var(--blue) 55%, rgba(247, 241, 230, 0.28));
  border-radius: var(--radius-pill);
}

.page-about .ab-timeline .timeline-item {
  position: relative;
}

.page-about .ab-timeline .timeline-dot {
  position: absolute;
  left: -26px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(11, 42, 74, 0.9);
  transition: transform 160ms ease, background-color 160ms ease;
}

.page-about .ab-timeline .timeline-item:hover .timeline-dot,
.page-about .ab-timeline .timeline-item:focus-within .timeline-dot {
  transform: scale(1.35);
  background: var(--orange);
}

.page-about .ab-tl-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--amber);
  margin-bottom: 4px;
}

.page-about .ab-tl-title {
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.3;
  margin: 0 0 8px;
  color: var(--paper);
}

.page-about .ab-tl-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(247, 241, 230, 0.76);
}

.page-about .ab-tl-foot {
  margin-top: 34px;
}

/* ---------- 团队分工 ---------- */
.page-about .ab-team-grid {
  display: grid;
  gap: 24px;
}

.page-about .ab-team-text p {
  font-size: 16px;
  line-height: 1.8;
  margin: 0 0 16px;
  color: var(--muted);
}

.page-about .ab-team-text strong {
  color: var(--ink);
}

.page-about .ab-next {
  margin-top: 30px;
  padding: 24px;
  background: var(--navy);
  border-radius: var(--radius-lg);
  color: var(--cream);
}

.page-about .ab-next p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 241, 230, 0.82);
}

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

.page-about .ab-next .btn--ghost {
  color: var(--cream);
  border-color: rgba(247, 241, 230, 0.5);
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 2px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-block {
    padding: 80px 0;
  }

  .page-about .ab-hero {
    padding: 32px 0 80px;
  }

  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
    gap: 44px;
  }

  .page-about .ab-hero-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    padding: 28px;
  }

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

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

  .page-about .ab-crew-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .ab-team-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .ab-dim summary {
    flex-wrap: nowrap;
  }

  .page-about .ab-dim-q {
    flex: 1 1 auto;
    text-align: right;
  }
}

@media (min-width: 960px) {
  .page-about .ab-block {
    padding: 104px 0;
  }

  .page-about .ab-chapter {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: var(--ab-gap);
    align-items: start;
  }

  .page-about .ab-chapter--media {
    grid-template-columns: calc(var(--ab-rail-w) - 40px) minmax(0, 1fr);
  }

  .page-about .ab-rail {
    position: sticky;
    top: 120px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding-top: 4px;
  }

  .page-about .ab-num {
    font-size: 52px;
  }

  .page-about .ab-num--inline {
    font-size: 56px;
  }

  .page-about .ab-wide-head {
    grid-template-columns: 110px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

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

  .page-about .ab-timeline {
    padding-left: 34px;
  }

  .page-about .ab-timeline .timeline-dot {
    left: -34px;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-hero-main h1 {
    max-width: 15em;
  }

  .page-about .ab-tl-media {
    max-width: 880px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-dim,
  .page-about .ab-timeline .timeline-dot {
    transition: none;
  }

  .page-about .ab-timeline .timeline-item:hover .timeline-dot {
    transform: none;
  }
}