.page-about {
  --ab-hero-h: clamp(560px, 82vh, 820px);
  display: block;
  background: var(--c-paper);
  color: var(--c-ink);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  min-height: var(--ab-hero-h);
  display: flex;
  align-items: flex-end;
  padding: calc(var(--head-h) + clamp(40px, 8vw, 96px)) 0 clamp(48px, 7vw, 88px);
  background: var(--c-night);
  color: #fff;
  isolation: isolate;
}

.page-about .ab-hero-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.page-about .ab-hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 62%;
}

.page-about .ab-hero-veil {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(180deg, rgba(11,27,51,.78) 0%, rgba(11,27,51,.32) 38%, rgba(11,27,51,.92) 100%),
    linear-gradient(118deg, rgba(18,164,107,.6) 0%, rgba(255,210,63,.14) 50%, rgba(255,106,31,.48) 100%);
}

.page-about .ab-corner {
  position: absolute;
  width: 14px;
  height: 14px;
  background: var(--c-orange);
  z-index: 2;
  border-radius: 2px;
}

.page-about .ab-corner--tl { top: calc(var(--head-h) + 16px); left: 16px; }
.page-about .ab-corner--tr { top: calc(var(--head-h) + 16px); right: 16px; }
.page-about .ab-corner--bl { bottom: 18px; left: 16px; }
.page-about .ab-corner--br { bottom: 18px; right: 16px; }

.page-about .ab-hero-inner {
  position: relative;
  z-index: 3;
}

.page-about .ab-crumbs {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .ab-crumbs .breadcrumbs-list a {
  color: rgba(255,255,255,.78);
  text-decoration: none;
}

.page-about .ab-crumbs .breadcrumbs-item {
  color: rgba(255,255,255,.94);
}

.page-about .ab-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--c-signal);
  margin: 0 0 16px;
}

.page-about .ab-eyebrow::before {
  content: "";
  width: 30px;
  height: 3px;
  border-radius: 2px;
  background: var(--lane);
}

.page-about .ab-hero-mark {
  display: flex;
  align-items: flex-end;
  gap: clamp(10px, 2vw, 22px);
  margin-bottom: clamp(6px, 1.4vw, 14px);
}

.page-about .ab-hero-num {
  font-size: clamp(86px, 17vw, 200px);
  font-weight: 900;
  line-height: .8;
  letter-spacing: -0.06em;
  background: var(--lane-soft);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-variant-numeric: tabular-nums;
}

.page-about .ab-hero-unit {
  font-size: clamp(14px, 1.6vw, 20px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: .06em;
  color: rgba(255,255,255,.88);
  padding-bottom: clamp(8px, 2vw, 26px);
}

.page-about .ab-hero-title {
  font-size: clamp(30px, 5.4vw, 64px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  max-width: 17em;
  text-shadow: 0 4px 26px rgba(0,0,0,.35);
}

.page-about .ab-hero-lede {
  max-width: 42em;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.8;
  color: rgba(255,255,255,.9);
  margin: 0 0 clamp(24px, 3.4vw, 36px);
}

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

.page-about .ab-hero .btn--outline,
.page-about .ab-cta .btn--outline {
  border-color: rgba(255,255,255,.55);
  color: #fff;
}

.page-about .ab-hero .btn--outline:hover,
.page-about .ab-cta .btn--outline:hover {
  background: #fff;
  border-color: #fff;
  color: var(--c-night);
}

/* ---------- 数据带 ---------- */
.page-about .ab-stats {
  position: relative;
  background: var(--c-night);
  color: #fff;
  padding: clamp(28px, 4vw, 46px) 0;
}

.page-about .ab-stats::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--lane);
}

.page-about .ab-stats-inner {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(20px, 4vw, 40px);
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-stat-num {
  font-size: clamp(30px, 4vw, 46px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-signal);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-stat-label {
  font-size: 14px;
  color: rgba(255,255,255,.74);
}

/* ---------- 草原根基 ---------- */
.page-about .ab-origin {
  position: relative;
  padding: clamp(56px, 9vw, 112px) 0;
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(217,242,230,.95) 0%, rgba(247,249,244,0) 62%),
    var(--c-paper);
}

.page-about .ab-origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 64px);
}

.page-about .ab-origin-quote {
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 800;
  line-height: 1.45;
  letter-spacing: -0.01em;
  padding-left: 20px;
  border-left: 6px solid var(--c-orange);
  margin: 0 0 24px;
  color: var(--c-ink);
}

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

.page-about .ab-origin-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #fff;
  border: 1px solid var(--c-fog);
  border-radius: var(--r-md);
  padding: 12px 16px;
  font-size: 15px;
  color: var(--c-ink-soft);
}

.page-about .ab-origin-list li::before {
  content: "";
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-green);
}

.page-about .ab-origin-body p:not(.eyebrow) {
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: var(--c-ink-soft);
  margin: 0 0 1.1em;
}

.page-about .ab-origin-body p:last-child {
  margin-bottom: 0;
}

/* ---------- 内容运转 ---------- */
.page-about .ab-flow {
  margin-inline: clamp(10px, 3vw, 40px);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, var(--c-mist) 0%, #EAF7F0 100%);
  padding: clamp(48px, 7vw, 92px) 0;
}

.page-about .ab-flow .section-lede {
  color: var(--c-ink-soft);
}

.page-about .ab-flow-list {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .ab-flow-item {
  position: relative;
  background: #fff;
  border-radius: var(--r-lg);
  padding: clamp(22px, 3vw, 28px);
  box-shadow: 0 14px 32px rgba(11,27,51,.08);
  overflow: hidden;
}

.page-about .ab-flow-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--lane);
}

.page-about .ab-flow-idx {
  display: inline-block;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .16em;
  color: var(--c-orange-deep);
  margin-bottom: 10px;
  font-variant-numeric: tabular-nums;
}

.page-about .ab-flow-name {
  font-size: clamp(19px, 2vw, 22px);
  font-weight: 800;
  color: var(--c-green-deep);
  margin: 0 0 8px;
}

.page-about .ab-flow-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-ink-soft);
}

.page-about .ab-flow-note {
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 16px 20px;
  border-left: 5px solid var(--c-orange);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(255,255,255,.78);
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-ink);
}

/* ---------- 团队与分工 ---------- */
.page-about .ab-team {
  padding: clamp(56px, 9vw, 112px) 0;
}

.page-about .ab-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 60px);
}

.page-about .ab-team-copy p:not(.eyebrow) {
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: var(--c-ink-soft);
  margin: 0 0 1.1em;
}

.page-about .ab-team-figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--c-mist);
  box-shadow: 0 18px 44px rgba(11,27,51,.12);
}

.page-about .ab-team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .ab-team-figure figcaption {
  padding: 12px 18px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--c-green-deep);
  background: var(--c-mist);
}

.page-about .ab-team-map {
  margin-top: clamp(32px, 5vw, 60px);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 10px;
}

.page-about .ab-team-svg {
  display: block;
  width: 760px;
  max-width: none;
  height: auto;
}

.page-about .ab-team-svg .tm-line {
  fill: none;
  stroke: url(#abLane);
  stroke-width: 2.5;
  stroke-linecap: round;
}

.page-about .ab-team-svg .tm-box {
  fill: #fff;
  stroke: var(--c-fog);
  stroke-width: 1.5;
}

.page-about .ab-team-svg .tm-box--hot {
  fill: var(--c-mist);
  stroke: var(--c-green);
  stroke-width: 2;
}

.page-about .ab-team-svg .tm-label {
  fill: var(--c-ink);
  font-size: 17px;
  font-weight: 800;
  font-family: var(--font);
}

.page-about .ab-team-svg .tm-sub {
  fill: var(--c-ink-soft);
  font-size: 13px;
  font-family: var(--font);
}

/* ---------- 版本节点 ---------- */
.page-about .ab-tl {
  position: relative;
  padding: clamp(56px, 9vw, 112px) 0;
  background: var(--c-night);
  color: #fff;
  overflow: hidden;
}

.page-about .ab-tl::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -30%;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(18,164,107,.42) 0%, rgba(18,164,107,0) 68%);
  pointer-events: none;
}

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

.page-about .ab-tl .section-title { color: #fff; }
.page-about .ab-tl .section-lede { color: rgba(255,255,255,.76); }
.page-about .ab-tl .eyebrow { color: var(--c-signal); }

.page-about .ab-tl-list {
  list-style: none;
  margin: clamp(30px, 5vw, 56px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .ab-tl-list::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 10px;
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--c-signal) 0%, var(--c-orange) 55%, var(--c-green) 100%);
  opacity: .55;
}

.page-about .ab-tl-item {
  position: relative;
  padding-left: 42px;
  margin-bottom: 14px;
}

.page-about .ab-tl-item::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 18px;
  width: 18px;
  height: 18px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--c-night);
  border: 3px solid var(--c-signal);
  z-index: 1;
}

.page-about .ab-tl-item:last-child {
  margin-bottom: 0;
}

.page-about .ab-tl-node {
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: background .25s ease, border-color .25s ease;
}

.page-about .ab-tl-node[open] {
  background: rgba(255,255,255,.09);
  border-color: rgba(255,210,63,.4);
}

.page-about .ab-tl-head {
  list-style: none;
  cursor: pointer;
  padding: 16px 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .ab-tl-head::-webkit-details-marker { display: none; }

.page-about .ab-tl-ver {
  flex: 0 0 auto;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .05em;
  color: var(--c-signal);
  background: rgba(255,210,63,.14);
  border: 1px solid rgba(255,210,63,.42);
  border-radius: var(--r-pill);
  padding: 3px 12px;
  font-variant-numeric: tabular-nums;
}

.page-about .ab-tl-stage {
  flex: 1 1 auto;
  font-size: clamp(17px, 1.8vw, 20px);
  font-weight: 800;
  color: #fff;
}

.page-about .ab-tl-toggle {
  flex: 0 0 auto;
  position: relative;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,.4);
  margin-left: auto;
}

.page-about .ab-tl-toggle::before,
.page-about .ab-tl-toggle::after {
  content: "";
  position: absolute;
  background: rgba(255,255,255,.82);
  border-radius: 2px;
}

.page-about .ab-tl-toggle::before {
  left: 50%;
  top: 4px;
  bottom: 4px;
  width: 2px;
  transform: translateX(-50%);
}

.page-about .ab-tl-toggle::after {
  top: 50%;
  left: 4px;
  right: 4px;
  height: 2px;
  transform: translateY(-50%);
}

.page-about .ab-tl-node[open] .ab-tl-toggle::before { display: none; }

.page-about .ab-tl-body {
  padding: 0 20px 18px;
}

.page-about .ab-tl-body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(255,255,255,.78);
}

/* ---------- 多端阅读 ---------- */
.page-about .ab-multi {
  padding: clamp(56px, 9vw, 112px) 0;
  background: var(--c-paper);
}

.page-about .ab-multi-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 5vw, 60px);
  align-items: center;
}

.page-about .ab-multi-figure {
  margin: 0;
  padding: 14px;
  border-radius: var(--r-lg);
  background: linear-gradient(140deg, var(--c-mist) 0%, #ffffff 100%);
  box-shadow: 0 16px 40px rgba(11,27,51,.1);
}

.page-about .ab-multi-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: calc(var(--r-lg) - 8px);
}

.page-about .ab-multi-copy p:not(.eyebrow) {
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: var(--c-ink-soft);
  margin: 0 0 1.1em;
}

.page-about .ab-multi-list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-multi-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  background: #fff;
  border: 1px solid var(--c-fog);
  border-radius: var(--r-md);
  padding: 14px 16px;
}

.page-about .ab-multi-key {
  flex: 0 0 auto;
  display: inline-block;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .06em;
  color: #fff;
  background: var(--c-green);
  border-radius: var(--r-pill);
  padding: 4px 12px;
  white-space: nowrap;
}

.page-about .ab-multi-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-ink-soft);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners {
  padding: clamp(52px, 8vw, 96px) 0 clamp(40px, 6vw, 72px);
  background: linear-gradient(180deg, var(--c-paper) 0%, var(--c-mist) 100%);
  overflow: hidden;
}

.page-about .ab-rail {
  margin-top: clamp(26px, 4vw, 44px);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 18px;
}

.page-about .ab-rail:focus-visible {
  outline: 3px solid var(--c-orange);
  outline-offset: -3px;
}

.page-about .ab-rail::-webkit-scrollbar { height: 6px; }
.page-about .ab-rail::-webkit-scrollbar-track {
  background: rgba(11,27,51,.08);
  border-radius: 3px;
}
.page-about .ab-rail::-webkit-scrollbar-thumb {
  background: var(--c-green);
  border-radius: 3px;
}

.page-about .ab-rail-track {
  list-style: none;
  margin: 0;
  padding: 0 var(--pad);
  display: flex;
  gap: 18px;
  width: max-content;
}

.page-about .ab-rail-card {
  position: relative;
  overflow: hidden;
  scroll-snap-align: start;
  width: min(78vw, 330px);
  background: #fff;
  border-radius: var(--r-lg);
  padding: 26px 22px 30px;
  box-shadow: 0 14px 34px rgba(11,27,51,.09);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform .26s ease, box-shadow .26s ease;
}

.page-about .ab-rail-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 46px rgba(11,27,51,.15);
}

.page-about .ab-rail-card::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: var(--lane);
}

.page-about .ab-rail-num {
  font-size: 34px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--c-green-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .ab-rail-name {
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  margin: 0;
  color: var(--c-ink);
}

.page-about .ab-rail-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-ink-soft);
}

/* ---------- 结尾 ---------- */
.page-about .ab-cta {
  position: relative;
  padding: clamp(56px, 8vw, 100px) 0;
  background: var(--c-night);
  color: #fff;
  overflow: hidden;
}

.page-about .ab-cta::before {
  content: "";
  position: absolute;
  top: -34%;
  right: -10%;
  width: 540px;
  height: 540px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,106,31,.42) 0%, rgba(255,106,31,0) 70%);
  pointer-events: none;
}

.page-about .ab-cta-inner {
  position: relative;
  z-index: 1;
  max-width: 820px;
}

.page-about .ab-cta-title {
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
}

.page-about .ab-cta-text {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255,255,255,.84);
  margin: 0 0 28px;
  max-width: 46em;
}

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

/* ---------- 悬浮回到节点 ---------- */
.page-about .ab-jump {
  position: fixed;
  right: clamp(14px, 2.4vw, 28px);
  bottom: clamp(14px, 2.4vw, 28px);
  z-index: 40;
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  border-radius: var(--r-pill);
  background: rgba(11,27,51,.86);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 12px 28px rgba(11,27,51,.3);
  border: 1px solid rgba(255,255,255,.16);
  transition: transform .22s ease, background .22s ease;
}

.page-about .ab-jump:hover {
  transform: translateY(-3px);
  background: var(--c-green-deep);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-stats-inner {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-corner--tl,
  .page-about .ab-corner--tr { left: auto; }
  .page-about .ab-corner--tl { left: 24px; }
  .page-about .ab-corner--tr { right: 24px; }
  .page-about .ab-corner--bl { left: 24px; }
  .page-about .ab-corner--br { right: 24px; }
}

@media (min-width: 760px) {
  .page-about .ab-tl-item { padding-left: 56px; }
  .page-about .ab-tl-item::before {
    left: 8px;
    width: 20px;
    height: 20px;
  }
}

@media (min-width: 860px) {
  .page-about .ab-flow-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
    padding-bottom: 58px;
  }

  .page-about .ab-flow-item:nth-child(2) {
    transform: translateY(28px);
  }

  .page-about .ab-flow-item:nth-child(3) {
    transform: translateY(56px);
  }
}

@media (min-width: 900px) {
  .page-about .ab-origin-grid {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }
}

@media (min-width: 920px) {
  .page-about .ab-team-grid {
    grid-template-columns: 7fr 5fr;
    align-items: center;
  }

  .page-about .ab-multi-grid {
    grid-template-columns: 6fr 6fr;
  }

  .page-about .ab-multi-figure {
    order: 1;
  }

  .page-about .ab-multi-copy {
    order: 2;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-team-svg {
    width: 100%;
  }
}

@media (min-width: 1320px) {
  .page-about .ab-rail-track {
    padding-left: calc((100vw - var(--wrap)) / 2);
    padding-right: calc((100vw - var(--wrap)) / 2);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail-card,
  .page-about .ab-jump,
  .page-about .ab-tl-node {
    transition: none;
  }

  .page-about .ab-rail-card:hover,
  .page-about .ab-jump:hover {
    transform: none;
  }

  .page-about .ab-flow-item:nth-child(2),
  .page-about .ab-flow-item:nth-child(3) {
    transform: none;
  }
}
<<<END>>>