.page-about {
  --about-rail-w: 132px;
  --about-team-ink: #0B1836;
  --about-team-sub: #46527A;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* 页面上缘 */
.page-about .about-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 20px;
  padding-top: 22px;
}

.page-about .about-topbar .eyebrow {
  margin: 0;
}

/* 首屏 */
.page-about .about-hero {
  padding-top: clamp(26px, 4vw, 54px);
}

.page-about .about-hero-grid {
  align-items: center;
  row-gap: clamp(26px, 4vw, 46px);
}

.page-about .about-hero-copy,
.page-about .about-hero-media {
  min-width: 0;
}

.page-about .about-hero-copy .eyebrow {
  display: block;
  margin: 0 0 16px;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-size: clamp(36px, 6.2vw, 80px);
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero .lead {
  max-width: 34ch;
  margin: 0;
  font-size: var(--fs-300);
  line-height: 1.9;
  color: var(--mist);
}

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

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

.page-about .about-hero-media img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-xl);
}

/* 首屏指标条 */
.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(30px, 4vw, 54px);
}

.page-about .about-facts .stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px;
  border: 1px solid var(--stroke);
  border-radius: var(--radius-lg);
  background: linear-gradient(155deg, rgba(10, 20, 48, 0.96), rgba(5, 11, 27, 0.7));
}

.page-about .about-facts .stat-value {
  font-size: clamp(26px, 3.4vw, 38px);
  line-height: 1;
}

/* 左右分栏长文节奏 */
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  padding-top: 26px;
  border-top: 1px solid var(--stroke);
}

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

.page-about .about-rail .chapter-no {
  font-family: var(--font-mono);
  font-size: var(--fs-100);
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .about-rail-label {
  font-size: var(--fs-100);
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-about .about-body {
  min-width: 0;
}

.page-about .about-body h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 600;
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-body .prose p {
  color: var(--mist);
}

.page-about .about-intro {
  max-width: 44ch;
  margin: 0 0 24px;
  line-height: 1.88;
  color: var(--mist);
}

.page-about .about-section--last .about-split {
  border-bottom: 1px solid var(--stroke);
  padding-bottom: 30px;
}

/* 数据来源 */
.page-about .about-flow {
  margin: 28px 0 0;
}

.page-about .about-flow img {
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  border-radius: var(--radius-lg);
}

.page-about .about-flow-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-step {
  padding: 18px 20px;
  border: 1px solid var(--stroke);
  border-radius: var(--radius-md);
  background: var(--panel);
}

.page-about .about-step-no {
  display: inline-block;
  font-size: var(--fs-100);
  letter-spacing: 0.2em;
  color: var(--violet);
}

.page-about .about-step h3 {
  margin: 10px 0 8px;
  font-size: var(--fs-300);
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-step p {
  margin: 0;
  font-size: var(--fs-200);
  line-height: 1.82;
  color: var(--mist);
}

/* 团队反色面板 */
.page-about .about-team-panel {
  padding: clamp(22px, 3.6vw, 46px);
}

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

.page-about .about-team-panel h2 {
  margin: 0 0 14px;
  color: var(--about-team-ink);
}

.page-about .about-team-lead {
  margin: 0;
  max-width: 40ch;
  font-size: var(--fs-300);
  line-height: 1.85;
  color: var(--about-team-sub);
}

.page-about .about-team-figure {
  margin: 0;
  max-width: 190px;
}

.page-about .about-team-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius-lg);
  opacity: 0.92;
}

.page-about .about-team-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-team-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-team-role {
  font-size: var(--fs-400);
  font-weight: 600;
  color: var(--about-team-ink);
}

.page-about .about-team-count {
  font-size: var(--fs-200);
  color: var(--about-team-sub);
}

.page-about .about-team-bar {
  display: block;
  height: 6px;
  margin: 12px 0 10px;
  border-radius: var(--pill);
  background: rgba(5, 11, 27, 0.12);
  overflow: hidden;
}

.page-about .about-team-bar-fill {
  display: block;
  height: 100%;
  border-radius: var(--pill);
  background: linear-gradient(90deg, var(--violet), var(--cyan));
}

.page-about .about-team-row:nth-child(1) .about-team-bar-fill { width: 35%; }
.page-about .about-team-row:nth-child(2) .about-team-bar-fill { width: 26%; }
.page-about .about-team-row:nth-child(3) .about-team-bar-fill { width: 24%; }
.page-about .about-team-row:nth-child(4) .about-team-bar-fill { width: 15%; }

.page-about .about-team-desc {
  margin: 0;
  font-size: var(--fs-200);
  line-height: 1.82;
  color: var(--about-team-sub);
}

/* 版本台阶 */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 22px 0;
  border-top: 1px solid var(--stroke);
  transition: padding-left var(--dur-fast) var(--ease), background-color var(--dur-fast) var(--ease);
}

.page-about .about-timeline-row:last-child {
  border-bottom: 1px solid var(--stroke);
}

.page-about .about-year {
  font-size: var(--fs-400);
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-timeline-body h3 {
  margin: 0 0 8px;
  font-size: var(--fs-300);
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-timeline-body p {
  margin: 0;
  max-width: 46ch;
  font-size: var(--fs-300);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-totop {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin-top: 26px;
  font-size: var(--fs-200);
  letter-spacing: 0.06em;
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid var(--stroke);
  transition: color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
}

.page-about .about-totop:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* 平板与桌面 */
@media (min-width: 768px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-flow-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-team-head {
    grid-template-columns: minmax(0, 1fr) 200px;
    gap: 32px;
  }

  .page-about .about-team-figure {
    max-width: none;
  }

  .page-about .about-team-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px 40px;
  }

  .page-about .about-timeline-row {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 30px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 0 32px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 30px);
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .page-about .about-body {
    padding-left: clamp(24px, 3vw, 42px);
    border-left: 1px solid var(--stroke);
  }

  .page-about .about-timeline-row:hover {
    padding-left: 12px;
    background: linear-gradient(90deg, rgba(59, 240, 220, 0.07), rgba(59, 240, 220, 0) 62%);
  }
}

@media (min-width: 1200px) {
  .page-about {
    --about-rail-w: 156px;
  }

  .page-about .about-hero-grid {
    column-gap: clamp(32px, 4vw, 64px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline-row,
  .page-about .about-totop {
    transition: none;
  }
}