.page-about {
  --ab-edge: 1px solid var(--line);
  --ab-card: var(--bg-section);
  --ab-card-hover: var(--bg-panel);
  display: block;
  background: var(--bg-void);
  color: var(--text);
  font-family: var(--font-body);
  padding-bottom: clamp(40px, 6vw, 88px);
  overflow-x: hidden;
}

.page-about .ab-wrap {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

.page-about .ab-crumb {
  margin-top: clamp(14px, 2vw, 24px);
  margin-bottom: clamp(10px, 1.6vw, 18px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  padding: clamp(20px, 3.4vw, 48px) 0 clamp(34px, 5vw, 76px);
  border-bottom: var(--ab-edge);
}

.page-about .ab-hero__eyebrow {
  margin: 0 0 16px;
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .ab-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 9vw, 82px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .ab-hero__lede {
  margin: 22px 0 0;
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .ab-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: var(--ab-edge);
}

.page-about .ab-fact {
  display: flex;
  flex-direction: column-reverse;
  gap: 6px;
  padding: 18px 16px;
  background: var(--ab-card);
}

.page-about .ab-fact__num {
  margin: 0;
  font-size: clamp(20px, 5vw, 28px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .ab-fact__label {
  font-size: 13px;
  color: var(--text-dim);
}

/* ---------- 通用区块 ---------- */
.page-about .ab-sec {
  padding: clamp(46px, 7vw, 92px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-sec--last {
  border-bottom: 0;
  padding-bottom: clamp(20px, 3vw, 40px);
}

.page-about .ab-sec .sec-head {
  margin-bottom: clamp(26px, 4vw, 50px);
}

/* ---------- 01 职能分组 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
}

.page-about .ab-team__fig {
  margin: 0;
}

.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: var(--ab-edge);
}

.page-about .ab-func {
  position: relative;
  padding: 24px 20px 22px;
  background: var(--ab-card);
  transition: background 240ms var(--ease);
}

.page-about .ab-func::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--legacy);
}

.page-about .ab-func:nth-child(1)::before { background: var(--cyan); }
.page-about .ab-func:nth-child(2)::before { background: var(--gold); }
.page-about .ab-func:nth-child(3)::before { background: var(--cyan); }
.page-about .ab-func:nth-child(4)::before { background: var(--legacy); }

.page-about .ab-func:hover,
.page-about .ab-func:focus-within {
  background: var(--ab-card-hover);
}

.page-about .ab-func__idx {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--text-dim);
}

.page-about .ab-func__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 24px;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .ab-func__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .ab-func__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-func__list li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .ab-func__list li:last-child {
  margin-bottom: 0;
}

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

/* ---------- 02 时间轴 ---------- */
.page-about .ab-filter {
  margin-bottom: clamp(22px, 3vw, 38px);
}

.page-about .ab-timeline {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 30px);
}

.page-about .ab-node {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .ab-node__year {
  margin: 0;
  font-size: clamp(26px, 6vw, 38px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--gold);
}

.page-about .ab-node__body {
  position: relative;
  padding: 22px 20px;
  background: var(--ab-card);
  border: var(--ab-edge);
  border-left: 2px solid var(--legacy);
  transition: border-color 240ms var(--ease), background 240ms var(--ease);
}

.page-about .ab-node__body:hover {
  border-left-color: var(--cyan);
  background: var(--ab-card-hover);
}

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

.page-about .ab-node__title {
  margin: 12px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(20px, 4.4vw, 24px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .ab-node__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .ab-tl-fig {
  margin: 0;
}

.page-about .filter-empty {
  margin: 18px 0 0;
  font-size: 14px;
  color: var(--text-dim);
}

/* ---------- 03 空间运营 ---------- */
.page-about .ab-space {
  position: relative;
  overflow: hidden;
  border: var(--ab-edge);
  background: var(--ab-card);
}

.page-about .ab-space__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  filter: saturate(0.7);
}

.page-about .ab-space::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, rgba(5, 10, 20, 0.96) 18%, rgba(5, 10, 20, 0.6) 62%, rgba(5, 10, 20, 0.28));
  pointer-events: none;
}

.page-about .ab-space__inner {
  position: relative;
  z-index: 1;
  padding: clamp(26px, 4.6vw, 60px);
}

.page-about .ab-space__lead {
  margin: 0 0 clamp(20px, 3vw, 34px);
  max-width: 44ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .ab-ops {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: var(--ab-edge);
}

.page-about .ab-ops__item {
  padding: 20px 18px;
  background: rgba(11, 20, 36, 0.9);
}

.page-about .ab-ops__tag {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .ab-ops__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .ab-ops__item p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 04 企业服务 ---------- */
.page-about .ab-services {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: var(--ab-edge);
}

.page-about .ab-svc {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 24px 0;
  border-bottom: var(--ab-edge);
}

.page-about .ab-svc__idx {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .ab-svc__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 24px;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .ab-svc__text {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .ab-svc__meta {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--legacy);
}

.page-about .ab-more {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 18px;
  margin-top: clamp(24px, 3.6vw, 44px);
  padding: 22px 20px;
  background: var(--ab-card);
  border: var(--ab-edge);
  border-left: 2px solid var(--cyan);
}

.page-about .ab-more p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 05 合作生态 ---------- */
.page-about .ab-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: var(--ab-edge);
}

.page-about .ab-partner {
  padding: 22px 20px;
  background: var(--ab-card);
  transition: background 240ms var(--ease);
}

.page-about .ab-partner:hover {
  background: var(--ab-card-hover);
}

.page-about .ab-partner__head {
  margin: 0 0 10px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .ab-partner__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .ab-partner p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 06 协作路径 ---------- */
.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border-top: var(--ab-edge);
  border-bottom: var(--ab-edge);
}

.page-about .ab-flow__item {
  position: relative;
  padding: 24px 20px 26px;
  background: var(--ab-card);
}

.page-about .ab-flow__item::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent 70%);
  opacity: 0.5;
}

.page-about .ab-flow__no {
  display: block;
  margin-bottom: 12px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .ab-flow__t {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  line-height: 1.35;
  color: var(--text);
}

.page-about .ab-flow__item p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .ab-flow__link {
  display: inline-block;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan-press);
  padding-bottom: 2px;
  transition: color 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .ab-flow__link:hover {
  color: var(--text);
  border-color: var(--text);
}

.page-about .ab-cta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 20px;
  margin-top: clamp(26px, 4vw, 46px);
  padding: clamp(24px, 3.6vw, 40px);
  background: var(--bg-section);
  border: var(--ab-edge);
  border-top: 2px solid var(--cyan);
}

.page-about .ab-cta__t {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(20px, 4vw, 26px);
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .ab-cta__s {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 响应式 ---------- */
@media (min-width: 900px) {
  .page-about .ab-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: clamp(20px, 3vw, 36px);
  }

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

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

  .page-about .ab-node {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 40px);
    align-items: start;
  }

  .page-about .ab-node__year {
    padding-top: 4px;
  }

  .page-about .ab-node--a .ab-node__body {
    min-height: 200px;
  }

  .page-about .ab-node--b {
    padding-left: clamp(0px, 3vw, 56px);
  }

  .page-about .ab-node--b .ab-node__body {
    min-height: 240px;
  }

  .page-about .ab-node--c .ab-node__body {
    min-height: 220px;
  }

  .page-about .ab-tl-fig {
    padding-left: clamp(0px, 3vw, 56px);
  }

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

  .page-about .ab-svc {
    grid-template-columns: 64px minmax(0, 220px) minmax(0, 1fr);
    gap: clamp(16px, 2.6vw, 36px);
    align-items: baseline;
  }

  .page-about .ab-svc__meta {
    grid-column: 3;
  }

  .page-about .ab-more {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .ab-more p {
    max-width: 52ch;
  }

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

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

  .page-about .ab-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 36px;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-partners {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .ab-node {
    grid-template-columns: 176px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-func,
  .page-about .ab-partner,
  .page-about .ab-node__body,
  .page-about .ab-flow__link {
    transition: none;
  }
}