.page-about {
  --about-line: rgba(111, 139, 133, .38);
  --about-ink-soft: rgba(42, 31, 26, .7);
  display: block;
  background: var(--ink-night);
  color: var(--text);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(16px, 3vw, 24px) var(--gutter) 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--moss);
}

.page-about .about-crumbs a {
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .22s var(--ease), border-color .22s var(--ease);
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--hairline-cyan);
}

.page-about .about-crumbs [aria-current="page"] {
  color: var(--text);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: clamp(18px, 3vw, 30px);
  padding: clamp(30px, 6vw, 68px) 0 clamp(38px, 6vw, 72px);
  background:
    radial-gradient(115% 85% at 8% 0%, rgba(79, 227, 208, .15), transparent 58%),
    radial-gradient(95% 70% at 94% 14%, rgba(255, 124, 51, .11), transparent 62%),
    var(--ink-night);
  border-top: 1px solid var(--hairline-soft);
  border-bottom: 1px solid var(--hairline);
  overflow: hidden;
}

.page-about .about-kicker {
  margin: 0;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-title {
  margin: clamp(14px, 2.4vw, 22px) 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(36px, 8.6vw, 84px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cream);
  max-width: 20ch;
}

.page-about .about-lede {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 2.3vw, 18px);
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(28px, 4.4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hairline-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--ink-carbon);
  padding: 18px 20px 20px;
}

.page-about .about-stat-value {
  display: block;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 5.4vw, 42px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .about-stat--amber .about-stat-value { color: var(--amber); }
.page-about .about-stat--orange .about-stat-value { color: var(--orange); }

.page-about .about-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--text-dim);
}

/* ---------- 通用章节头部 ---------- */
.page-about .section {
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-about .section-head {
  max-width: 64ch;
}

.page-about .section-kicker {
  margin: 0 0 12px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .section-head h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 5.2vw, 44px);
  line-height: 1.06;
  letter-spacing: -.015em;
  color: var(--cream);
}

.page-about .section-lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(15px, 2.1vw, 17px);
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .section-cream .section-kicker { color: var(--orange); }
.page-about .section-cream .section-head h2 { color: var(--brown); }
.page-about .section-cream .section-lede { color: var(--about-ink-soft); }

/* ---------- 时间轴 ---------- */
.page-about .about-stages {
  margin-top: clamp(30px, 5vw, 54px);
  display: grid;
  gap: clamp(30px, 5vw, 58px);
}

.page-about .about-stage {
  display: grid;
  gap: 16px;
  position: relative;
}

.page-about .stage-scale {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .stage-year {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(30px, 7vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .stage-scale-label {
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .stage-placard {
  padding: clamp(20px, 3.4vw, 32px);
}

.page-about .stage-placard .placard-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3.6vw, 28px);
  line-height: 1.15;
  letter-spacing: -.01em;
}

.page-about .stage-metrics {
  list-style: none;
  margin: 20px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid rgba(42, 31, 26, .16);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .stage-metric-value {
  display: block;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 5vw, 38px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--pitch);
}

.page-about .stage-metric-label {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--about-ink-soft);
}

.page-about .stage-media {
  margin: 0;
}

/* ---------- 媒体框 ---------- */
.page-about .media-frame {
  position: relative;
  display: block;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--ink-carbon);
  border: 1px solid var(--hairline-soft);
}

.page-about .media-frame img {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .media-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 14px 18px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--cream);
  background: linear-gradient(180deg, rgba(10, 21, 18, 0) 0%, rgba(10, 21, 18, .88) 62%);
}

/* ---------- 增长折线 ---------- */
.page-about .growth-figure {
  margin: 0;
  padding: 18px 14px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--hairline);
  background: rgba(18, 28, 26, .72);
}

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

.page-about .growth-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 12px;
  padding: 0 6px;
  font-size: 13px;
  color: var(--text-dim);
}

.page-about .growth-legend > span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .legend-swatch {
  display: inline-block;
  width: 18px;
  height: 3px;
  border-radius: 999px;
}

.page-about .legend-swatch--cyan { background: var(--cyan); }
.page-about .legend-swatch--orange { background: var(--orange); }

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  margin-top: clamp(26px, 4vw, 42px);
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

.page-about .role-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--hairline);
  background: var(--ink-carbon);
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .role-card:hover {
  border-color: var(--hairline-cyan);
  transform: translateY(-2px);
}

.page-about .role-num {
  margin: 4px 0 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 6.4vw, 50px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .role-card:nth-child(2) .role-num { color: var(--amber); }
.page-about .role-card:nth-child(3) .role-num { color: var(--orange); }

.page-about .role-unit {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-dim);
}

.page-about .role-name {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--cream);
}

.page-about .role-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .about-flow {
  margin-top: clamp(28px, 4.4vw, 46px);
  padding-top: clamp(20px, 3vw, 30px);
  border-top: 1px solid var(--hairline);
}

.page-about .flow-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(19px, 3.2vw, 25px);
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .flow-item {
  display: flex;
  gap: 14px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--hairline-soft);
  background: rgba(10, 21, 18, .55);
}

.page-about .flow-index {
  flex: none;
  padding-top: 3px;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--orange);
}

.page-about .flow-name {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--cream);
}

.page-about .flow-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-dim);
}

.page-about .about-team-media {
  margin: clamp(28px, 4.4vw, 46px) 0 0;
  aspect-ratio: 21 / 9;
}

/* ---------- 覆盖与栏目 ---------- */
.page-about .about-coverage-grid {
  margin-top: clamp(26px, 4vw, 44px);
  display: grid;
  gap: 22px;
}

.page-about .about-coverage-media {
  margin: 0;
  aspect-ratio: 4 / 3;
}

.page-about .column-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .column-item {
  padding: 18px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--hairline);
  background: linear-gradient(135deg, rgba(20, 51, 43, .55), rgba(10, 21, 18, .9));
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .column-item:hover,
.page-about .column-item:focus-within {
  border-color: var(--hairline-cyan);
  transform: translateY(-2px);
}

.page-about .column-name {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 3vw, 22px);
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .column-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-about .column-desc a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline-cyan);
}

.page-about .column-desc a:hover,
.page-about .column-desc a:focus-visible {
  color: var(--cream);
  border-bottom-color: var(--cream);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  margin-top: clamp(26px, 4vw, 42px);
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
}

.page-about .partner-card {
  padding: clamp(20px, 3vw, 30px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(42, 31, 26, .14);
  background: rgba(255, 255, 255, .52);
  transition: background .26s var(--ease), border-color .26s var(--ease), transform .26s var(--ease);
  cursor: default;
}

.page-about .partner-card:hover,
.page-about .partner-card:focus-visible,
.page-about .partner-card:focus-within {
  background: rgba(255, 255, 255, .82);
  border-color: rgba(255, 124, 51, .5);
  transform: translateY(-2px);
  outline: none;
}

.page-about .partner-count {
  margin: 0;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(32px, 5.6vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--brown);
}

.page-about .partner-count::after {
  content: "";
  display: block;
  width: 46px;
  height: 3px;
  margin-top: 10px;
  border-radius: 999px;
  background: var(--orange);
}

.page-about .partner-name {
  margin: 16px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 3.4vw, 26px);
  letter-spacing: -.01em;
  color: var(--brown);
}

.page-about .partner-lead {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--about-ink-soft);
}

.page-about .partner-more {
  margin: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-ink-soft);
  transition: max-height .34s var(--ease), opacity .26s var(--ease), margin-top .34s var(--ease);
}

.page-about .partner-card:hover .partner-more,
.page-about .partner-card:focus-within .partner-more,
.page-about .partner-card:focus-visible .partner-more {
  max-height: 220px;
  opacity: 1;
  margin-top: 12px;
}

.page-about .award-row {
  margin-top: clamp(26px, 4vw, 42px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: rgba(42, 31, 26, .16);
}

.page-about .award-item {
  padding: 18px 20px;
  background: rgba(255, 255, 255, .62);
}

.page-about .award-num {
  margin: 0 0 6px;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 4vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--brown);
}

.page-about .award-label {
  margin: 0;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--about-ink-soft);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  padding-bottom: clamp(48px, 7vw, 96px);
}

.page-about .cta-band {
  margin-top: clamp(24px, 4vw, 40px);
  display: grid;
  gap: 22px;
  padding: clamp(24px, 4vw, 44px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--hairline);
  background:
    linear-gradient(115deg, rgba(255, 124, 51, .18), transparent 58%),
    linear-gradient(180deg, var(--ink-carbon), var(--ink-night));
}

.page-about .cta-copy h2 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.08;
  letter-spacing: -.015em;
  color: var(--cream);
}

.page-about .cta-copy p {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-dim);
}

.page-about .cta-contact {
  margin: 18px 0 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-num);
  font-size: 14px;
  color: var(--cyan);
  word-break: break-all;
}

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

/* ---------- 平板 ---------- */
@media (min-width: 620px) {
  .page-about .award-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

/* ---------- 桌面：左侧年份刻度 ---------- */
@media (min-width: 900px) {
  .page-about .about-stages {
    position: relative;
  }

  .page-about .about-stages::before {
    content: "";
    position: absolute;
    left: 9px;
    top: 14px;
    bottom: 34px;
    width: 2px;
    border-radius: 999px;
    background: linear-gradient(180deg, rgba(79, 227, 208, .75), var(--about-line) 55%, rgba(111, 139, 133, .08));
  }

  .page-about .about-stage {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .stage-scale {
    position: relative;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding-left: 30px;
  }

  .page-about .stage-scale::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 14px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--ink-night);
    border: 2px solid var(--cyan);
    box-shadow: 0 0 0 5px rgba(79, 227, 208, .12);
  }

  .page-about .about-stage:nth-child(2) .stage-scale::before {
    border-color: var(--amber);
    box-shadow: 0 0 0 5px rgba(245, 198, 74, .12);
  }

  .page-about .about-stage:nth-child(3) .stage-scale::before {
    border-color: var(--silver);
    box-shadow: 0 0 0 5px rgba(195, 207, 202, .1);
  }

  .page-about .about-stage:nth-child(4) .stage-scale::before {
    border-color: var(--orange);
    box-shadow: 0 0 0 5px rgba(255, 124, 51, .16);
  }

  .page-about .stage-media {
    max-width: 82%;
  }

  .page-about .about-coverage-grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-team-media {
    aspect-ratio: 21 / 9;
  }

  .page-about .cta-band {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: center;
    gap: 34px;
  }

  .page-about .cta-actions {
    justify-content: flex-end;
  }
}

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

  .page-about .about-stage {
    grid-template-columns: 168px minmax(0, 1fr);
  }
}

/* ---------- 无悬停设备：合作说明常驻展开 ---------- */
@media (hover: none) {
  .page-about .partner-more {
    max-height: 220px;
    opacity: 1;
    margin-top: 12px;
  }
}

/* ---------- 降低动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .partner-card,
  .page-about .role-card,
  .page-about .column-item {
    transition: none;
  }

  .page-about .partner-card:hover,
  .page-about .partner-card:focus-within,
  .page-about .role-card:hover,
  .page-about .column-item:hover {
    transform: none;
  }
}