.page-about {
  --ab-side-col: 168px;
  --ab-split-gap: 40px;
  --ab-dim: rgba(237, 241, 245, .74);
  --ab-dim-soft: rgba(237, 241, 245, .56);
}

/* ---------- 侧栏注释 ---------- */
.page-about .ab-side {
  display: none;
}

@media (min-width: 900px) {
  .page-about .ab-side {
    display: flex;
    align-items: flex-start;
    padding-top: 10px;
    position: sticky;
    top: 96px;
    align-self: start;
  }
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--hair);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(115deg, rgba(47, 216, 208, .10) 0%, rgba(47, 216, 208, 0) 48%),
    linear-gradient(rgba(199, 210, 220, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(199, 210, 220, .055) 1px, transparent 1px);
  background-size: 100% 100%, 72px 72px, 72px 72px;
}

.page-about .ab-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding-top: clamp(40px, 7vw, 84px);
  padding-bottom: clamp(56px, 9vw, 108px);
}

@media (min-width: 900px) {
  .page-about .ab-hero-grid {
    grid-template-columns: var(--ab-side-col) minmax(0, 1fr);
    gap: var(--ab-split-gap);
  }
}

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

.page-about .ab-hero-lead {
  max-width: 40em;
  margin-top: 18px;
}

.page-about .ab-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 38px;
}

@media (min-width: 760px) {
  .page-about .ab-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }
}

.page-about .ab-stat {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 18px 20px 20px;
  background: var(--ink-2);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .ab-stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--cyan);
}

.page-about .ab-stat-num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
  letter-spacing: -.01em;
}

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

/* ---------- 通用分栏 ---------- */
.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

@media (min-width: 900px) {
  .page-about .ab-split {
    grid-template-columns: var(--ab-side-col) minmax(0, 1fr);
    gap: var(--ab-split-gap);
  }
}

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

.page-about .ab-body > .prose + .prose {
  margin-top: 14px;
}

/* ---------- 服务对象 ---------- */
.page-about .ab-position {
  border-bottom: 1px solid var(--hair);
}

.page-about .ab-persona-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 30px;
  align-items: start;
}

@media (min-width: 720px) {
  .page-about .ab-persona-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-persona:nth-child(2) {
    margin-top: 30px;
  }
  .page-about .ab-persona:nth-child(3) {
    margin-top: 14px;
  }
}

.page-about .ab-persona-index {
  display: block;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
  margin-bottom: 10px;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline-section {
  position: relative;
}

.page-about .ab-timeline {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  max-width: 820px;
}

.page-about .ab-tl-item {
  position: relative;
  padding: 0 0 30px 34px;
  border-left: 1px solid var(--hair-strong);
  outline: none;
}

.page-about .ab-tl-item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 7px;
  width: 11px;
  height: 11px;
  background: var(--cyan);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
  transition: background-color .18s var(--ease), transform .18s var(--ease);
}

.page-about .ab-tl-item:hover::before,
.page-about .ab-tl-item:focus-visible::before {
  background: var(--amber);
  transform: scale(1.35);
}

.page-about .ab-tl-item:focus-visible {
  box-shadow: 0 0 0 2px var(--amber);
  border-radius: 2px;
}

.page-about .ab-tl-year {
  display: inline-block;
  font-size: 22px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: .02em;
  margin-bottom: 8px;
}

.page-about .ab-tl-brief {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ab-dim);
  max-width: 36em;
}

.page-about .ab-tl-more {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .32s var(--ease);
}

.page-about .ab-tl-more > div {
  overflow: hidden;
}

.page-about .ab-tl-more p {
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ab-dim);
  border-left: 2px solid var(--amber);
  padding-left: 14px;
  max-width: 34em;
}

.page-about .ab-tl-item:hover .ab-tl-more,
.page-about .ab-tl-item:focus-within .ab-tl-more {
  grid-template-rows: 1fr;
}

/* ---------- 标签矩阵 ---------- */
.page-about .ab-tags-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: 34px;
}

@media (min-width: 1024px) {
  .page-about .ab-tags-layout {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }
}

.page-about .ab-tag-matrix {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(148px, 1fr));
  gap: 12px;
}

@media (min-width: 900px) {
  .page-about .ab-tag-matrix {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .page-about .ab-tag-cell:nth-child(1) { grid-column: span 3; }
  .page-about .ab-tag-cell:nth-child(2) { grid-column: span 3; }
  .page-about .ab-tag-cell:nth-child(3) { grid-column: span 2; }
  .page-about .ab-tag-cell:nth-child(4) { grid-column: span 2; }
  .page-about .ab-tag-cell:nth-child(5) { grid-column: span 2; }
  .page-about .ab-tag-cell:nth-child(6) { grid-column: span 3; }
  .page-about .ab-tag-cell:nth-child(7) { grid-column: span 3; }
}

.page-about .ab-tag-cell {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--hair);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
  padding: 18px 18px 20px;
  outline: none;
  transition: border-color .2s var(--ease), background-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .ab-tag-cell:hover,
.page-about .ab-tag-cell:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan);
  background: var(--ink-3);
}

.page-about .ab-tag-cell:focus-visible {
  box-shadow: 0 0 0 2px var(--amber);
}

.page-about .ab-tag-num {
  display: block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--ab-dim-soft);
}

.page-about .ab-tag-name {
  display: block;
  font-size: 17px;
  font-weight: 700;
  color: var(--mist);
  margin: 8px 0 8px;
}

.page-about .ab-tag-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--ab-dim);
}

.page-about .ab-tags-figure {
  margin: 0;
}

@media (min-width: 1024px) {
  .page-about .ab-tags-figure {
    position: sticky;
    top: 96px;
  }
}

/* ---------- 版本对照 ---------- */
.page-about .ab-version {
  background: var(--ink-2);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}

.page-about .ab-compare {
  margin-top: 30px;
}

.page-about .ab-compare-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-compare-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ab-dim);
}

.page-about .ab-compare-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 1px;
  background: var(--wire);
}

.page-about .compare-col--prev .ab-compare-list li::before {
  background: var(--amber);
}

.page-about .ab-folds {
  margin-top: 30px;
}

.page-about .ab-fold {
  background: var(--ink);
  border: 1px solid var(--hair);
  border-left: 3px solid var(--amber);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 0 100%);
}

.page-about .ab-fold + .ab-fold {
  margin-top: 12px;
}

.page-about .ab-fold > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 22px;
  font-size: 16px;
  font-weight: 600;
  color: var(--mist);
  outline: none;
}

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

.page-about .ab-fold > summary::before {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  background: var(--amber);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
  transition: transform .2s var(--ease);
}

.page-about .ab-fold[open] > summary::before {
  transform: rotate(90deg);
}

.page-about .ab-fold > summary:focus-visible {
  box-shadow: inset 0 0 0 2px var(--amber);
}

.page-about .ab-fold-body {
  margin: 0;
  padding: 0 22px 20px 43px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ab-dim);
}

/* ---------- 团队 ---------- */
.page-about .ab-team-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  margin-top: 34px;
}

@media (min-width: 960px) {
  .page-about .ab-team-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 44px;
    align-items: start;
  }
}

.page-about .ab-team-figure {
  margin: 0;
}

.page-about .ab-team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .ab-team-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--hair);
}

.page-about .ab-team-step:last-child {
  border-bottom: 1px solid var(--hair);
}

.page-about .ab-team-num {
  font-size: 15px;
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: .08em;
  padding-top: 2px;
}

.page-about .ab-team-step p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ab-dim);
}

/* ---------- 规模 ---------- */
.page-about .ab-scale {
  background: var(--mist);
  color: var(--graphite);
}

.page-about .ab-scale .section-title {
  color: var(--graphite);
}

.page-about .ab-scale .prose {
  color: #33455A;
}

.page-about .ab-scale-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

@media (min-width: 900px) {
  .page-about .ab-scale-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    gap: 44px;
    align-items: start;
  }
}

.page-about .ab-scale-figure {
  margin: 0;
}

.page-about .ab-scale-text .prose + .prose {
  margin-top: 14px;
}

.page-about .ab-scale-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 40px;
  background: var(--wire);
  border: 1px solid var(--wire);
}

@media (min-width: 760px) {
  .page-about .ab-scale-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .ab-scale-cell {
  background: #FFFFFF;
  padding: 22px 18px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
}

.page-about .ab-scale-num {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--ink-3);
}

.page-about .ab-scale-label {
  font-size: 13px;
  line-height: 1.55;
  color: #4A5B6E;
}

/* ---------- 季度白皮书 ---------- */
.page-about .ab-wp-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 30px;
  background: var(--hair-strong);
}

@media (min-width: 760px) {
  .page-about .ab-wp-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .ab-wp-item {
  background: var(--ink);
  padding: 22px 20px 24px;
}

.page-about .ab-wp-num {
  display: block;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--amber);
  margin-bottom: 10px;
}

.page-about .ab-wp-item p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ab-dim);
}

/* ---------- 收束 ---------- */
.page-about .ab-cta {
  padding-bottom: clamp(72px, 10vw, 140px);
}

.page-about .ab-cta-panel {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding: clamp(28px, 4vw, 46px);
  background: linear-gradient(118deg, var(--ink-3) 0%, var(--ink-2) 58%, var(--ink) 100%);
  border: 1px solid var(--hair-strong);
  clip-path: polygon(0 0, calc(100% - 28px) 0, 100% 28px, 100% 100%, 0 100%);
  overflow: hidden;
}

.page-about .ab-cta-panel::before {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle, rgba(47, 216, 208, .22) 0%, rgba(47, 216, 208, 0) 70%);
  pointer-events: none;
}

@media (min-width: 900px) {
  .page-about .ab-cta-panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }
}

.page-about .ab-cta-text {
  position: relative;
  min-width: 0;
}

.page-about .ab-cta-actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 正文链接 ---------- */
.page-about .prose a:not(.btn) {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color .18s var(--ease);
}

.page-about .prose a:not(.btn):hover {
  color: var(--amber);
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl-more {
    grid-template-rows: 1fr;
    transition: none;
  }
  .page-about .ab-tl-item::before,
  .page-about .ab-tag-cell,
  .page-about .ab-fold > summary::before {
    transition: none;
  }
  .page-about .ab-tag-cell:hover,
  .page-about .ab-tag-cell:focus-visible,
  .page-about .ab-tl-item:hover::before,
  .page-about .ab-tl-item:focus-visible::before {
    transform: none;
  }
}
</main>
<<<END>>>