.page-about {
  --ab-rail-w: 58px;
  --ab-slate: #5A7396;
  --ab-soft-text: rgba(245, 248, 252, 0.76);
  --ab-mute-text: rgba(245, 248, 252, 0.68);
  color: var(--ice);
  background: var(--ink-space);
  overflow-x: hidden;
}

.page-about .page-about-main {
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  padding-top: clamp(20px, 3vw, 32px);
  padding-bottom: clamp(32px, 5vw, 64px);
  border-bottom: 1px solid var(--line-blue);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(to right, rgba(37, 55, 84, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(37, 55, 84, 0.35) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), transparent 76%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), transparent 76%);
  pointer-events: none;
}

.page-about .ab-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
  margin-top: clamp(16px, 3vw, 28px);
}

.page-about .ab-hero-rail {
  display: none;
}

.page-about .ab-hero h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0.32em 0 0;
  max-width: 17ch;
}

.page-about .ab-lede {
  margin: clamp(14px, 2vw, 22px) 0 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.8;
  color: var(--ab-soft-text);
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-about .ab-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 1px;
  background: var(--line-blue);
  border: 1px solid var(--line-blue);
}

.page-about .ab-hero-stats > div {
  background: var(--ink-space);
  padding: 14px 16px;
  min-width: 0;
}

.page-about .ab-hero-stats dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .ab-hero-stats dd {
  margin: 6px 0 0;
  font-family: var(--font-num);
  font-size: clamp(1.5rem, 3vw, 2rem);
  line-height: 1;
  color: var(--amber);
}

.page-about .ab-unit-suffix {
  font-size: 0.6em;
  margin-left: 2px;
  color: var(--flame);
}

.page-about .ab-hero-media {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-section {
  padding: clamp(40px, 6vw, 84px) 0;
  border-bottom: 1px solid var(--line-blue);
}

.page-about .ab-section > .container {
  position: relative;
}

.page-about .ab-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.6vw, 2.375rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 clamp(14px, 2vw, 20px);
}

.page-about .ab-note {
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--mist);
  border-left: 1px solid var(--line-blue);
  padding-left: 12px;
  margin: 0 0 clamp(16px, 2vw, 22px);
}

.page-about .ab-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
}

.page-about .ab-body-lg {
  margin: 0 0 clamp(18px, 2.5vw, 26px);
  font-size: clamp(1rem, 1.5vw, 1.0625rem);
  line-height: 1.82;
  color: var(--ab-soft-text);
}

.page-about .ab-body-lg--tight {
  margin: clamp(18px, 2.5vw, 26px) 0 0;
  font-size: 0.9375rem;
  color: var(--ab-mute-text);
}

/* ---------- 卡片 ---------- */
.page-about .ab-card {
  height: 100%;
  padding: clamp(16px, 2vw, 22px);
  background: var(--ink-module);
  border: 1px solid var(--line-blue);
  border-top: 2px solid var(--line-blue);
  transition: border-top-color 0.2s ease, background-color 0.2s ease;
}

.page-about .ab-card:hover {
  border-top-color: var(--flame);
  background: #16223A;
}

.page-about .ab-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--ice);
}

.page-about .ab-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--ab-mute-text);
}

.page-about .ab-card--flat {
  background: transparent;
  border-top-color: var(--flame);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  position: relative;
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--flame), var(--line-blue) 24%, var(--line-blue));
}

.page-about .ab-node {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 34px) 28px;
}

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

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--line-blue);
  border-radius: 50%;
  background: var(--ink-space);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.page-about .ab-node:hover::before {
  background: var(--flame);
  border-color: var(--flame);
}

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

.page-about .ab-node-year .numeric {
  font-family: var(--font-num);
  font-size: clamp(1.75rem, 4vw, 2.375rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .ab-node-tag {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mist);
  border: 1px solid var(--line-blue);
  padding: 2px 8px;
  white-space: nowrap;
}

.page-about .ab-node-title {
  font-family: var(--font-display);
  font-size: clamp(1.0625rem, 2vw, 1.1875rem);
  font-weight: 700;
  margin: 10px 0 6px;
  color: var(--ice);
}

.page-about .ab-node-body p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--ab-mute-text);
}

/* ---------- 团队 ---------- */
.page-about .ab-team-media {
  margin: 0;
}

.page-about .ab-team-figure {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
  align-items: center;
}

.page-about .ab-donut {
  display: block;
  width: 100%;
  max-width: 210px;
  height: auto;
  margin: 0 auto;
}

.page-about .ab-donut-track {
  fill: none;
  stroke: rgba(37, 55, 84, 0.65);
  stroke-width: 14;
}

.page-about .ab-seg {
  fill: none;
  stroke-width: 14;
  transition: stroke-width 0.2s ease;
}

.page-about .ab-seg--1 { stroke: var(--pitch); }
.page-about .ab-seg--2 { stroke: var(--flame); }
.page-about .ab-seg--3 { stroke: var(--amber); }
.page-about .ab-seg--4 { stroke: var(--mist); }
.page-about .ab-seg--5 { stroke: var(--ab-slate); }

.page-about .ab-donut-label {
  font-family: var(--font-num);
  font-size: 26px;
  fill: var(--ice);
}

.page-about .ab-donut-sub {
  font-family: var(--font-body);
  font-size: 10px;
  letter-spacing: 0.2em;
  fill: var(--mist);
}

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

.page-about .ab-team-item {
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 10px 8px;
  border-bottom: 1px solid var(--line-blue);
  transition: background-color 0.18s ease;
}

.page-about .ab-team-item:hover {
  background: var(--ink-module);
}

.page-about .ab-team-swatch {
  display: block;
  width: 10px;
  height: 10px;
}

.page-about .ab-team-item--1 .ab-team-swatch { background: var(--pitch); }
.page-about .ab-team-item--2 .ab-team-swatch { background: var(--flame); }
.page-about .ab-team-item--3 .ab-team-swatch { background: var(--amber); }
.page-about .ab-team-item--4 .ab-team-swatch { background: var(--mist); }
.page-about .ab-team-item--5 .ab-team-swatch { background: var(--ab-slate); }

.page-about .ab-team-name {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 0.9375rem;
  color: var(--ice);
  min-width: 0;
}

.page-about .ab-team-name em {
  font-style: normal;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-team-count {
  font-family: var(--font-num);
  font-size: 1.375rem;
  line-height: 1;
  color: var(--ice);
}

/* ---------- 数据治理 ---------- */
.page-about .ab-governance-media {
  margin: 0 0 clamp(14px, 2vw, 20px);
}

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

.page-about .ab-layer {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0 14px 12px;
  border-bottom: 1px solid var(--line-blue);
  border-left: 2px solid transparent;
  transition: border-left-color 0.2s ease, background-color 0.2s ease;
}

.page-about .ab-layer:hover {
  border-left-color: var(--flame);
  background: rgba(17, 27, 48, 0.7);
}

.page-about .ab-layer-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--amber);
  padding-top: 3px;
}

.page-about .ab-layer h3 {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 700;
  margin: 0 0 4px;
  color: var(--ice);
}

.page-about .ab-layer p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.72;
  color: var(--ab-mute-text);
}

/* ---------- 生态与荣誉 ---------- */
.page-about .ab-eco-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 clamp(20px, 3vw, 28px);
  padding: 0;
  list-style: none;
}

.page-about .ab-honor {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line-blue);
}

.page-about .ab-honor-item {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-blue);
}

.page-about .ab-honor-year {
  font-family: var(--font-num);
  font-size: 1.375rem;
  line-height: 1;
  color: var(--flame);
}

.page-about .ab-honor-item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--ab-soft-text);
}

/* ---------- 品牌文化 ---------- */
.page-about .ab-quote {
  margin: 0 0 clamp(22px, 3vw, 32px);
  padding: clamp(22px, 4vw, 42px);
  border-left: 3px solid var(--flame);
  background: linear-gradient(135deg, var(--ink-module), var(--ink-space));
}

.page-about .ab-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.125rem, 2.6vw, 1.625rem);
  line-height: 1.55;
  letter-spacing: -0.005em;
  color: var(--ice);
}

.page-about .ab-culture-grid .ab-card {
  height: 100%;
}

/* ---------- 收尾引导 ---------- */
.page-about .ab-cta {
  position: relative;
  padding: clamp(40px, 6vw, 80px) 0;
  background: var(--ink-module);
  border-top: 1px solid var(--line-blue);
}

.page-about .ab-cta-inner {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  max-width: 720px;
}

.page-about .ab-cta h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  line-height: 1.18;
  margin: 0;
  letter-spacing: -0.01em;
}

.page-about .ab-cta p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ab-mute-text);
}

.page-about .ab-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

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

  .page-about .ab-team-figure {
    grid-template-columns: minmax(0, 190px) minmax(0, 1fr);
  }
}

@media (min-width: 760px) {
  .page-about .ab-timeline::before {
    left: 118px;
  }

  .page-about .ab-node {
    display: grid;
    grid-template-columns: 118px minmax(0, 1fr);
    gap: clamp(16px, 3vw, 32px);
    padding-left: 0;
    padding-bottom: clamp(24px, 3vw, 36px);
  }

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

  .page-about .ab-node::before {
    left: 113px;
    top: 11px;
  }

  .page-about .ab-node-year {
    justify-content: flex-end;
    padding-right: 18px;
    text-align: right;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero-grid {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 52px);
  }

  .page-about .ab-hero-rail {
    display: block;
  }

  .page-about .ab-hero-rail .vertical-note {
    display: inline-block;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: 12px;
    letter-spacing: 0.18em;
    color: var(--mist);
    border-left: 1px solid var(--line-blue);
    padding-left: 10px;
    align-self: stretch;
  }

  .page-about .ab-split {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(28px, 4vw, 60px);
    align-items: start;
  }

  .page-about .ab-split--reverse > .ab-split-wide {
    order: 1;
  }

  .page-about .ab-split--reverse > .ab-split-narrow {
    order: 2;
  }
}

@media (min-width: 1100px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 4.5fr) minmax(0, 7.5fr);
  }

  .page-about .ab-split--reverse {
    grid-template-columns: minmax(0, 7.5fr) minmax(0, 4.5fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-card,
  .page-about .ab-team-item,
  .page-about .ab-layer,
  .page-about .ab-node::before {
    transition: none;
  }
}
<<<END>>>