.page-about {
  --about-rail: 96px;
  --about-band-h: 140px;
}

/* 面包屑间距 */
.page-about .breadcrumbs {
  padding-top: var(--s3);
  font-size: 12px;
}

/* 首屏 */
.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s4);
  padding: var(--s3) 0 var(--s5);
}

.page-about .about-hero__lead {
  display: flex;
  flex-direction: column;
  gap: var(--s2);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 7.5vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0;
}

.page-about .about-hero__intro {
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  max-width: 38em;
  margin: 0;
}

.page-about .about-hero__numbers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: var(--s1);
}

.page-about .about-hero__numbers .stat {
  background: var(--paper-white);
  padding: var(--s2);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__numbers .stat-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 28px;
  line-height: 1;
  color: var(--bamboo);
}

.page-about .about-hero__numbers .stat-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--grey-bamboo);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
  margin-top: var(--s1);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--paper-white);
  box-shadow: var(--shadow-2);
  clip-path: var(--cut);
}

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

.page-about .about-hero__figure figcaption {
  padding: var(--s2);
  font-size: 12px;
  line-height: 1.6;
  color: var(--grey-bamboo);
  border-top: 1px solid var(--line);
}

/* 主体：轨道 + 章节 */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s4);
  padding-bottom: var(--s5);
}

.page-about .about-rail {
  position: static;
  display: flex;
  align-items: center;
  gap: var(--s2);
  overflow-x: auto;
  padding-bottom: var(--s1);
  border-bottom: 1px solid var(--line);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__note {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--shu-red);
}

.page-about .about-rail__list {
  display: flex;
  gap: var(--s2);
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-rail__link {
  display: block;
  flex: 0 0 auto;
  padding: 4px 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--grey-bamboo);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
  white-space: nowrap;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--shu-red);
}

.page-about .about-sections {
  display: flex;
  flex-direction: column;
  gap: var(--s5);
  min-width: 0;
}

/* 章节通用 */
.page-about .about-sec {
  min-width: 0;
}

.page-about .about-sec__head {
  display: flex;
  flex-direction: column;
  gap: var(--s1);
  margin-bottom: var(--s3);
}

.page-about .about-sec h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 4.4vw, 40px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0;
}

.page-about .about-sec__lead {
  font-size: 16px;
  line-height: 1.75;
  color: var(--grey-bamboo);
  max-width: 36em;
  margin: 0;
}

.page-about .about-sec__body {
  display: flex;
  flex-direction: column;
  gap: var(--s2);
  max-width: 38em;
}

.page-about .about-sec__body p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-sec__body a,
.page-about .about-network__link a {
  color: var(--shu-red);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-sec__body a:hover,
.page-about .about-network__link a:hover {
  color: var(--shu-red-deep);
}

/* 团队矩阵 */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s2);
}

.page-about .team-card {
  display: flex;
  flex-direction: column;
  gap: var(--s1);
  padding: var(--s3);
  background: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  clip-path: var(--cut);
  min-width: 0;
}

.page-about .team-card--wide {
  background: var(--paper-warm);
  border-color: var(--bamboo-soft);
}

.page-about .team-card--ink {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper-warm);
}

.page-about .team-card__code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--bamboo);
}

.page-about .team-card--ink .team-card__code {
  color: var(--gold);
}

.page-about .team-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 40px;
  line-height: 1;
  color: var(--shu-red);
}

.page-about .team-card__num span {
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: 0.06em;
  margin-left: 4px;
  color: var(--grey-bamboo);
}

.page-about .team-card--ink .team-card__num {
  color: var(--gold);
}

.page-about .team-card--ink .team-card__num span {
  color: var(--bamboo-soft);
}

.page-about .team-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .team-card--ink h3 {
  color: var(--paper-white);
}

.page-about .team-card p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--grey-bamboo);
}

.page-about .team-card--ink p:last-child {
  color: rgba(246, 239, 225, 0.82);
}

/* 时间轴 */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  padding: var(--s4) var(--s3);
  background: var(--paper-white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-timeline__watermark {
  position: absolute;
  right: -6px;
  top: -14px;
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 64px;
  line-height: 1;
  letter-spacing: -0.05em;
  color: rgba(46, 107, 88, 0.1);
  pointer-events: none;
  user-select: none;
}

.page-about .about-timeline__band {
  margin: 0 0 var(--s4);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-timeline__band img {
  display: block;
  width: 100%;
  height: var(--about-band-h);
  max-width: 100%;
  object-fit: cover;
}

.page-about .timeline__track {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s3);
  padding-left: var(--s3);
}

.page-about .timeline__track::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: var(--bamboo-soft);
}

.page-about .tl-node {
  min-width: 0;
}

.page-about .tl-node summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: var(--s2);
  align-items: center;
  list-style: none;
  cursor: pointer;
}

.page-about .tl-node summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-node__mark {
  grid-row: 1 / span 2;
  width: 12px;
  height: 12px;
  background: var(--bamboo);
  border-radius: 2px;
  transition: background 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .tl-node summary:hover .tl-node__mark {
  background: var(--shu-red);
}

.page-about .tl-node[open] .tl-node__mark {
  background: var(--shu-red);
  transform: rotate(45deg);
}

.page-about .tl-node__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 24px;
  line-height: 1.1;
  color: var(--ink);
}

.page-about .tl-node__title {
  font-size: 14px;
  line-height: 1.5;
  color: var(--grey-bamboo);
}

.page-about .tl-node__text {
  margin: var(--s2) 0 0 28px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink);
  border-left: 2px solid var(--line);
  padding-left: var(--s2);
}

/* 校订流程 */
.page-about .review-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s3);
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: none;
}

.page-about .review-step {
  position: relative;
  padding: var(--s3);
  background: var(--paper-warm);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-width: 0;
}

.page-about .review-step__idx {
  margin: 0 0 var(--s1);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--shu-red);
}

.page-about .review-step h3 {
  margin: 0 0 var(--s1);
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .review-step p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--grey-bamboo);
}

/* 在地与合作 */
.page-about .about-network {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s3);
  align-items: start;
}

.page-about .about-network__text {
  display: flex;
  flex-direction: column;
  gap: var(--s2);
}

.page-about .about-network h2 {
  margin: 0;
}

.page-about .about-network__text p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-network__link {
  font-size: 14px;
  color: var(--grey-bamboo);
}

.page-about .network-figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--bamboo);
  border: 1px solid var(--bamboo);
  border-radius: var(--radius);
  overflow: hidden;
  margin-top: var(--s1);
}

.page-about .network-figure {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--s2);
  background: var(--bamboo);
  color: var(--paper-white);
}

.page-about .network-figure__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 22px;
  line-height: 1.1;
}

.page-about .network-figure__label {
  font-size: 12px;
  line-height: 1.5;
  color: rgba(255, 251, 243, 0.8);
}

.page-about .about-network__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--paper-white);
  clip-path: var(--cut);
}

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

.page-about .about-network__figure figcaption {
  padding: var(--s2);
  font-size: 12px;
  line-height: 1.6;
  color: var(--grey-bamboo);
  border-top: 1px solid var(--line);
}

/* 做事方式 */
.page-about .about-practice {
  background: var(--ink);
  border-radius: var(--radius);
  padding: var(--s4) var(--s3);
  color: var(--paper-warm);
}

.page-about .about-practice .eyebrow {
  color: var(--gold);
}

.page-about .about-practice h2 {
  color: var(--paper-white);
}

.page-about .practice-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s3);
}

.page-about .practice-item {
  padding-top: var(--s2);
  border-top: 1px solid rgba(246, 239, 225, 0.18);
  min-width: 0;
}

.page-about .practice-item__idx {
  margin: 0 0 var(--s1);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .practice-item h3 {
  margin: 0 0 var(--s1);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--paper-white);
}

.page-about .practice-item p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(246, 239, 225, 0.78);
}

.page-about .about-practice__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
  margin-top: var(--s4);
}

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

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

  .page-about .team-card--wide {
    grid-column: span 2;
  }

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

  .page-about .practice-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--s3) var(--s4);
  }

  .page-about .about-network {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: var(--s4);
  }

  .page-about .about-timeline {
    padding: var(--s4);
  }

  .page-about .about-practice {
    padding: var(--s5) var(--s4);
  }

  .page-about .about-network__figure {
    margin-top: var(--s2);
  }
}

/* 桌面：常驻竖向轨道 + 横向时间轴 + 2×3 团队矩阵 */
@media (min-width: 1024px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
    gap: var(--s5);
    padding: var(--s4) 0 var(--s5);
  }

  .page-about .about-hero__figure {
    margin-top: var(--s2);
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: var(--s4);
  }

  .page-about .about-rail {
    position: sticky;
    top: 88px;
    align-self: start;
    display: block;
    overflow: visible;
    border-bottom: none;
    padding-bottom: 0;
  }

  .page-about .about-rail__note {
    display: block;
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
    margin-bottom: var(--s2);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: var(--s2);
  }

  .page-about .about-rail__link {
    writing-mode: vertical-rl;
    letter-spacing: 0.22em;
    padding: 0 0 0 10px;
    border-bottom: none;
    border-left: 2px solid var(--line);
    min-height: 88px;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    border-left-color: var(--shu-red);
  }

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

  .page-about .team-card--wide {
    grid-column: span 2;
  }

  .page-about .timeline__track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--s3);
    padding-left: 0;
    padding-top: var(--s3);
  }

  .page-about .timeline__track::before {
    left: 0;
    right: 0;
    top: 30px;
    bottom: auto;
    width: auto;
    height: 2px;
  }

  .page-about .tl-node summary {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 6px;
    align-items: start;
  }

  .page-about .tl-node__mark {
    grid-row: auto;
    margin-bottom: var(--s1);
  }

  .page-about .tl-node__text {
    margin-left: 0;
    padding-left: var(--s2);
  }

  .page-about .about-network {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: var(--s5);
  }

  .page-about :is(.about-sec, .team-card, .review-step, .practice-item)[data-reveal] {
    opacity: 1;
  }
}

@media (min-width: 1200px) {
  .page-about {
    --about-band-h: 180px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .tl-node__mark {
    transition: none;
  }
}