.page-about {
  --ab-line: rgba(216, 180, 90, .28);
  background:
    radial-gradient(1100px 520px at 88% -8%, rgba(74, 168, 255, .10), transparent 70%),
    radial-gradient(820px 460px at -6% 26%, rgba(216, 180, 90, .08), transparent 72%),
    var(--ink-deep);
  color: var(--warm);
  overflow-x: hidden;
}

.page-about .ab-crumb {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 20px 0 56px;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -32%;
  right: -14%;
  width: 80%;
  height: 156%;
  transform: skewX(-13deg);
  background:
    repeating-linear-gradient(90deg, rgba(216, 180, 90, .07) 0 1px, transparent 1px 30px),
    linear-gradient(200deg, rgba(255, 90, 54, .14), transparent 58%);
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 88%);
  mask-image: linear-gradient(180deg, #000, transparent 88%);
  pointer-events: none;
}

.page-about .ab-hero__grid {
  position: relative;
  display: grid;
  gap: 30px;
}

.page-about .display {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.05;
  font-size: clamp(2.1rem, 8.2vw, 4.6rem);
  margin: 12px 0 0;
  color: var(--warm);
}

.page-about .lede {
  font-family: var(--font-serif);
  font-size: clamp(1rem, 2.6vw, 1.15rem);
  line-height: 1.9;
  color: var(--mint);
  margin: 20px 0 0;
  max-width: 60ch;
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid var(--ab-line);
  max-width: 34rem;
}

.page-about .ab-hero__stats .stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 5.2vw, 2rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold-neon);
}

.page-about .ab-hero__stats .stat-value--blue {
  color: var(--blue);
}

.page-about .ab-hero__stats .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--mint);
}

/* 导览索引 */
.page-about .ab-index {
  align-self: start;
  border: 1px solid var(--ab-line);
  border-radius: var(--r-lg);
  background: rgba(11, 20, 18, .58);
  padding: 20px;
}

.page-about .ab-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
}

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

.page-about .ab-index a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--r-sm);
  border-left: 3px solid transparent;
  color: var(--mint);
  font-size: 15px;
  text-decoration: none;
  transition: color .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease);
}

.page-about .ab-index a::after {
  content: "→";
  font-family: var(--font-mono);
  color: var(--gold);
  opacity: .7;
  transition: transform .25s var(--ease), opacity .25s var(--ease);
}

.page-about .ab-index a:hover,
.page-about .ab-index a:focus-visible {
  color: var(--warm);
  background: rgba(216, 180, 90, .09);
  border-left-color: var(--orange);
  outline: none;
}

.page-about .ab-index a:hover::after {
  transform: translateX(4px);
  opacity: 1;
}

/* ---------- 通用区块 ---------- */
.page-about .section {
  padding: 54px 0;
  position: relative;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.18;
  font-size: clamp(1.55rem, 5.4vw, 2.5rem);
  margin: 10px 0 0;
  color: var(--warm);
  max-width: 24ch;
}

.page-about .prose {
  font-size: 16px;
  line-height: 1.9;
  color: var(--mint);
  margin: 16px 0 0;
  max-width: 62ch;
}

.page-about .ab-split {
  display: grid;
  gap: 26px;
  align-items: center;
}

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  position: relative;
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--ab-line);
  background: var(--ink-night);
  box-shadow: var(--shadow-lift);
}

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

.page-about .ab-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 35, 31, 0) 52%, rgba(6, 35, 31, .55));
  pointer-events: none;
}

.page-about .ab-figure--evo {
  margin-top: 30px;
  border-radius: var(--r-xl);
}

/* ---------- 起点要点 ---------- */
.page-about .ab-facts {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-facts li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--warm);
}

.page-about .ab-facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--gold);
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  position: relative;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--ab-line), rgba(216, 180, 90, .04));
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 26px 34px;
}

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--ink-deep);
  border: 2px solid var(--gold);
  transition: border-color .3s var(--ease), background .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  border-color: var(--gold-neon);
  background: var(--orange);
  box-shadow: 0 0 0 6px rgba(255, 90, 54, .16);
}

.page-about .tl-item:focus-visible {
  outline: none;
}

.page-about .tl-stage {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--blue);
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.05rem, 3.6vw, 1.35rem);
  line-height: 1.35;
  margin: 6px 0 0;
  color: var(--warm);
}

.page-about .tl-text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mint);
  max-width: 60ch;
}

.page-about .tl-extra {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mint);
  max-width: 60ch;
  border-left: 2px solid var(--ab-line);
  padding-left: 12px;
}

/* ---------- 技能树 ---------- */
.page-about .ab-tree {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .tree-node {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 6px 18px;
  padding: 20px 22px;
  border-radius: var(--r-lg);
  background: var(--panel);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--blue);
  transition: transform .3s var(--ease), border-color .3s var(--ease), background .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .tree-node:hover {
  transform: translateY(-3px);
  border-left-color: var(--gold);
  border-color: var(--ab-line);
  background: rgba(216, 180, 90, .06);
  box-shadow: var(--shadow-lift);
}

.page-about .tree-num {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--gold-neon);
  line-height: 1.3;
}

.page-about .tree-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.08rem;
  line-height: 1.35;
  margin: 0;
  color: var(--warm);
}

.page-about .tree-text {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mint);
}

/* ---------- 团队 ---------- */
.page-about .ab-team__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 合作卡片 ---------- */
.page-about .ab-cards {
  display: grid;
  gap: 16px;
  margin-top: 32px;
}

.page-about .ab-card {
  display: grid;
  align-content: start;
  gap: 12px;
  padding: 24px;
  border-radius: var(--r-lg);
  background: var(--panel);
  border: 1px solid var(--line-soft);
  transition: transform .3s var(--ease), border-color .3s var(--ease), background .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .ab-card:hover {
  transform: translateY(-4px);
  border-color: var(--gold);
  background: rgba(216, 180, 90, .07);
  box-shadow: var(--shadow-lift);
}

.page-about .ab-card .chip {
  justify-self: start;
}

.page-about .ab-card__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.14rem;
  line-height: 1.35;
  margin: 0;
  color: var(--warm);
}

.page-about .ab-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mint);
}

.page-about .ab-legal {
  margin-top: 30px;
  padding: 20px 22px;
  border-radius: var(--r-md);
  border: 1px dashed var(--ab-line);
  background: var(--panel-deep);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.page-about .ab-legal__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mint);
  max-width: 52ch;
}

.page-about .ab-legal__icp {
  margin: 0;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--gold);
}

/* ---------- 未来方向 ---------- */
.page-about .ab-road__grid {
  display: grid;
  gap: 18px;
  margin-top: 30px;
}

.page-about .ab-road__item {
  padding: 22px 0 22px 22px;
  border-left: 2px solid var(--ab-line);
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .ab-road__item:hover {
  border-left-color: var(--gold-neon);
  background: linear-gradient(90deg, rgba(216, 180, 90, .07), transparent 78%);
}

.page-about .road-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.06rem;
  line-height: 1.4;
  margin: 0;
  color: var(--warm);
}

.page-about .road-text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mint);
  max-width: 54ch;
}

/* ---------- 收束 ---------- */
.page-about .ab-cta {
  padding-bottom: 72px;
}

.page-about .ab-cta__inner {
  position: relative;
  border-radius: var(--r-xl);
  border: 1px solid var(--ab-line);
  background:
    linear-gradient(135deg, rgba(255, 90, 54, .16), rgba(74, 168, 255, .10) 58%, rgba(6, 35, 31, 0)),
    var(--ink-raise);
  padding: 34px 24px;
  overflow: hidden;
}

.page-about .ab-cta__inner::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 55%;
  height: 180%;
  transform: skewX(-16deg);
  background: repeating-linear-gradient(90deg, rgba(242, 204, 107, .10) 0 1px, transparent 1px 22px);
  pointer-events: none;
}

.page-about .ab-cta__title {
  position: relative;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 5.6vw, 2.3rem);
  line-height: 1.2;
  margin: 0;
  color: var(--warm);
}

.page-about .ab-cta__text {
  position: relative;
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mint);
  max-width: 58ch;
}

.page-about .ab-cta__actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 760px) {
  .page-about .section {
    padding: 72px 0;
  }

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

  .page-about .ab-road__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 30px;
  }

  .page-about .ab-cta__inner {
    padding: 48px 44px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 36px 0 84px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(250px, .76fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .section {
    padding: 92px 0;
  }
}

@media (min-width: 960px) {
  .page-about .ab-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    gap: 56px;
  }

  .page-about .ab-timeline {
    margin-top: 44px;
  }

  .page-about .tl-item {
    padding-bottom: 22px;
  }

  .page-about .ab-tree {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

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

/* 时间轴说明在指针设备上的展开交互 */
@media (hover: hover) and (min-width: 960px) {
  .page-about .tl-extra {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    padding-left: 12px;
    overflow: hidden;
    border-left-color: transparent;
    transition: max-height .45s var(--ease), opacity .35s var(--ease), margin-top .35s var(--ease), border-color .35s var(--ease);
  }

  .page-about .tl-item:hover .tl-extra,
  .page-about .tl-item:focus-within .tl-extra {
    max-height: 220px;
    opacity: 1;
    margin-top: 10px;
    border-left-color: var(--ab-line);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-index a,
  .page-about .ab-index a::after,
  .page-about .ab-card,
  .page-about .tree-node,
  .page-about .tl-item::before,
  .page-about .tl-extra,
  .page-about .ab-road__item {
    transition: none;
  }

  .page-about .tree-node:hover,
  .page-about .ab-card:hover {
    transform: none;
  }
}
<<<END>>>