.page-about {
  --about-rail-w: 224px;
  --about-card-bg: rgba(13, 43, 30, 0.62);
  background: var(--bw-deep);
  color: var(--bw-cream);
  font-family: var(--bw-font-sans);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 4.6vw, 58px) 0 clamp(38px, 6vw, 76px);
  border-bottom: 1px solid var(--bw-line);
  background:
    radial-gradient(115% 90% at 88% 0%, rgba(45, 125, 255, 0.20), transparent 62%),
    radial-gradient(95% 80% at 0% 100%, rgba(63, 107, 74, 0.32), transparent 66%),
    var(--bw-deep);
}

.page-about .about-hero__crumb {
  margin-bottom: clamp(22px, 3.4vw, 40px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4.6vw, 52px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 22ch;
}

.page-about .about-hero__lede {
  margin-top: clamp(16px, 2.2vw, 24px);
  max-width: 60ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--bw-line);
  border: 1px solid var(--bw-line);
  border-radius: var(--bw-radius);
  overflow: hidden;
  align-self: start;
}

.page-about .about-hero__facts .bw-kpi {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 2.4vw, 24px);
  background: var(--about-card-bg);
  min-width: 0;
}

.page-about .bw-kpi__num {
  font-family: var(--bw-font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.page-about .bw-kpi__label {
  color: var(--bw-mist);
  font-size: 0.8125rem;
  line-height: 1.5;
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4.6vw, 60px);
  padding: clamp(40px, 6vw, 78px) 0 clamp(52px, 7.4vw, 104px);
}

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

.page-about .about-rail__title {
  margin: 0 0 14px;
  font-family: var(--bw-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--bw-mist);
}

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

.page-about .about-rail__link {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  border-radius: var(--bw-radius-sm);
  color: rgba(244, 239, 228, 0.72);
  text-decoration: none;
  font-size: 0.875rem;
  line-height: 1.45;
  transition: color 0.22s var(--bw-ease), background 0.22s var(--bw-ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--bw-cream);
  background: rgba(63, 107, 74, 0.3);
}

.page-about .about-rail__num {
  font-family: var(--bw-font-mono);
  font-size: 0.7rem;
  color: var(--bw-clay);
}

/* ---------- 章节 ---------- */
.page-about .about-block {
  position: relative;
}

.page-about .about-block + .about-block {
  margin-top: clamp(46px, 6.4vw, 92px);
  padding-top: clamp(40px, 5.4vw, 74px);
  border-top: 1px solid var(--bw-line-soft);
}

.page-about .about-block__head {
  margin-bottom: clamp(22px, 3.2vw, 38px);
  max-width: 76ch;
}

.page-about .about-chapter,
.page-about .about-block__head .bw-chapter__num {
  color: var(--bw-clay);
  font-family: var(--bw-font-mono);
}

.page-about .about-block__head .bw-chapter__title {
  margin-top: 8px;
}

.page-about .about-block__head .bw-chapter__lead {
  margin-top: 12px;
  color: rgba(244, 239, 228, 0.78);
}

.page-about .about-inline-link {
  margin-top: clamp(18px, 2.6vw, 28px);
  font-size: 0.9375rem;
}

/* ---------- 时间线 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}

.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 2px 0 0 30px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--bw-clay), rgba(201, 123, 90, 0.12));
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(24px, 3.2vw, 38px) clamp(10px, 1.8vw, 20px);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 7px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--bw-deep);
  border: 2px solid var(--bw-clay);
  transition: background 0.25s var(--bw-ease), border-color 0.25s var(--bw-ease), box-shadow 0.25s var(--bw-ease);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--bw-signal);
  border-color: var(--bw-signal);
  box-shadow: 0 0 0 6px rgba(230, 255, 63, 0.14);
}

.page-about .about-ver {
  margin: 0 0 4px;
  font-family: var(--bw-font-mono);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  color: var(--bw-signal);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
}

/* ---------- 图片与说明牌 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure__frame {
  position: relative;
  border-radius: var(--bw-radius);
  overflow: hidden;
}

.page-about .about-figure__frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-figure__frame--eco {
  background: linear-gradient(135deg, rgba(10, 61, 58, 0.85), rgba(45, 125, 255, 0.35));
}

.page-about .about-figure--wide {
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .about-figure__cap {
  margin-top: 14px;
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--bw-line);
  border: 1px solid var(--bw-line);
  border-radius: var(--bw-radius);
  overflow: hidden;
}

.page-about .about-role {
  background: var(--about-card-bg);
  padding: clamp(18px, 2.6vw, 28px);
}

.page-about .about-role__num {
  margin: 0 0 10px;
  font-family: var(--bw-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--bw-mist);
}

.page-about .about-role .bw-h3 {
  margin: 0 0 8px;
}

.page-about .about-cities {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 0;
}

/* ---------- 数据生产流程 ---------- */
.page-about .about-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--bw-line);
  border: 1px solid var(--bw-line);
  border-radius: var(--bw-radius);
  overflow: hidden;
}

.page-about .about-flow__item {
  background: var(--about-card-bg);
  padding: clamp(18px, 2.6vw, 26px);
}

.page-about .about-flow__item--tint {
  background: linear-gradient(135deg, rgba(10, 61, 58, 0.7), rgba(45, 125, 255, 0.22));
}

.page-about .about-flow__label {
  margin: 0 0 8px;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--bw-mist);
  font-family: var(--bw-font-mono);
}

.page-about .about-flow__value {
  margin: 0 0 8px;
  font-family: var(--bw-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  line-height: 1.4;
  color: var(--bw-signal);
}

.page-about .about-flow__item .bw-text {
  margin: 0;
  color: rgba(244, 239, 228, 0.76);
  font-size: 0.9375rem;
}

/* ---------- 合作生态 ---------- */
.page-about .about-modes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--bw-line);
  border: 1px solid var(--bw-line);
  border-radius: var(--bw-radius);
  overflow: hidden;
  margin-bottom: clamp(28px, 4vw, 46px);
}

.page-about .about-mode {
  background: var(--about-card-bg);
  padding: clamp(18px, 2.6vw, 26px);
  transition: background 0.26s var(--bw-ease);
}

.page-about .about-mode:hover {
  background: rgba(24, 58, 42, 0.85);
}

.page-about .about-mode__num {
  margin: 0 0 10px;
  font-family: var(--bw-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--bw-clay);
}

.page-about .about-mode .bw-h3 {
  margin: 0 0 8px;
}

.page-about .about-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.6vw, 44px);
  align-items: center;
}

.page-about .about-eco__map-wrap {
  padding: clamp(10px, 2vw, 20px);
  border-radius: var(--bw-radius);
  background: radial-gradient(90% 90% at 50% 40%, rgba(63, 107, 74, 0.28), rgba(13, 43, 30, 0.5) 70%);
  border: 1px solid var(--bw-line);
}

.page-about .about-eco__map {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-eco__map line {
  stroke: rgba(168, 181, 160, 0.34);
  stroke-width: 1;
}

.page-about .about-eco__map circle {
  fill: var(--bw-night);
  stroke: var(--bw-moss);
  stroke-width: 1.5;
  transform-box: fill-box;
  transform-origin: center;
  transition: fill 0.26s var(--bw-ease), stroke 0.26s var(--bw-ease), transform 0.26s var(--bw-ease);
}

.page-about .about-eco__node text {
  fill: var(--bw-mist);
  font-family: var(--bw-font-sans);
  font-size: 12px;
  text-anchor: middle;
  transition: fill 0.26s var(--bw-ease);
}

.page-about .about-eco__node:hover circle,
.page-about .about-eco__node:focus-within circle {
  fill: var(--bw-signal);
  stroke: var(--bw-signal);
  transform: scale(1.16);
}

.page-about .about-eco__node:hover text,
.page-about .about-eco__node:focus-within text {
  fill: var(--bw-cream);
}

.page-about .about-eco__node--hub circle {
  fill: rgba(45, 125, 255, 0.3);
  stroke: var(--bw-blue);
}

.page-about .about-eco__node--hub text {
  fill: var(--bw-cream);
}

.page-about .about-eco__copy .bw-h3 {
  margin: 0 0 12px;
}

.page-about .about-eco__copy .bw-text + .bw-text {
  margin-top: 12px;
}

/* ---------- 服务成果 ---------- */
.page-about .about-scale {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 20px);
}

.page-about .about-scale__card {
  padding: clamp(20px, 2.8vw, 30px);
  border-radius: var(--bw-radius);
  background: var(--about-card-bg);
  border: 1px solid var(--bw-line);
}

.page-about .about-scale__card--hero {
  background: linear-gradient(140deg, rgba(10, 61, 58, 0.92), rgba(45, 125, 255, 0.28));
  border-color: rgba(45, 125, 255, 0.4);
}

.page-about .about-scale__num {
  margin: 0 0 8px;
  font-family: var(--bw-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.8rem, 4.4vw, 2.9rem);
  line-height: 1.05;
  color: var(--bw-signal);
  letter-spacing: -0.02em;
}

.page-about .about-scale__label {
  margin: 0 0 10px;
  font-size: 0.9375rem;
  color: var(--bw-cream);
}

.page-about .about-scale__card .bw-text {
  margin: 0;
  color: rgba(244, 239, 228, 0.74);
  font-size: 0.9375rem;
}

/* ---------- 荣誉 ---------- */
.page-about .about-honors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--bw-line);
  border-top: 1px solid var(--bw-line);
  border-bottom: 1px solid var(--bw-line);
}

.page-about .about-honor {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: clamp(20px, 2.8vw, 30px) clamp(4px, 1vw, 10px);
  background: var(--bw-deep);
}

.page-about .about-honor__year {
  margin: 0;
  font-family: var(--bw-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
  color: var(--bw-clay);
  line-height: 1;
}

.page-about .about-honor .bw-h3 {
  margin: 0 0 8px;
}

.page-about .about-honor .bw-text {
  margin: 0;
  color: rgba(244, 239, 228, 0.74);
}

.page-about .about-honors__tail {
  margin-top: clamp(20px, 2.8vw, 30px);
  color: rgba(244, 239, 228, 0.72);
  max-width: 68ch;
}

/* ---------- 服务响应 ---------- */
.page-about .about-service {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .about-service__item {
  position: relative;
  padding-left: clamp(20px, 3vw, 30px);
  border-left: 2px solid rgba(201, 123, 90, 0.55);
}

.page-about .about-service__num {
  margin: 0 0 6px;
  font-family: var(--bw-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--bw-mist);
}

.page-about .about-service__item .bw-h3 {
  margin: 0 0 8px;
}

.page-about .about-service__item .bw-text {
  margin: 0;
  color: rgba(244, 239, 228, 0.76);
}

/* ---------- 合作邀请 ---------- */
.page-about .about-cta {
  border-radius: var(--bw-radius);
  border: 1px solid var(--bw-line);
  padding: clamp(24px, 4vw, 46px);
  background:
    radial-gradient(120% 130% at 8% 0%, rgba(63, 107, 74, 0.55), transparent 62%),
    linear-gradient(135deg, rgba(10, 61, 58, 0.92), rgba(45, 125, 255, 0.3));
}

.page-about .about-cta__paths {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 28px);
}

.page-about .about-cta__path .bw-h3 {
  margin: 0 0 8px;
}

.page-about .about-cta__path .bw-text {
  margin: 0;
  color: rgba(244, 239, 228, 0.78);
  font-size: 0.9375rem;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3.4vw, 36px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .about-scale {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: stretch;
  }

  .page-about .about-scale__card--hero {
    grid-column: span 2;
  }

  .page-about .about-honor {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }

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

@media (min-width: 860px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-eco {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 104px;
    align-self: start;
  }

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

  .page-about .about-scale {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-scale__card--hero {
    grid-column: span 2;
  }

  .page-about .about-scale__card {
    grid-column: span 2;
  }
}

@media (min-width: 1280px) {
  .page-about .about-modes {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item::before,
  .page-about .about-eco__map circle,
  .page-about .about-eco__node text,
  .page-about .about-rail__link,
  .page-about .about-mode {
    transition: none;
  }

  .page-about .about-eco__node:hover circle,
  .page-about .about-eco__node:focus-within circle {
    transform: none;
  }
}
</main>