.page-about {
  background: var(--ink);
  color: var(--chalk);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: 26px 50px;
  background: var(--ink);
  border-bottom: 2px solid var(--pitch);
}

.page-about .hero-grid {
  display: grid;
  gap: 34px;
  margin-top: 22px;
}

.page-about .hero-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 7.6vw, 84px);
  line-height: 0.98;
  letter-spacing: 0.01em;
  color: var(--white);
  margin: 10px 0 0;
}

.page-about .hero-title::after {
  content: "";
  display: block;
  width: 88px;
  height: 8px;
  margin-top: 20px;
  background: var(--neon);
}

.page-about .hero-lede {
  margin: 22px 0 26px;
  max-width: 54ch;
  font-size: 17px;
  line-height: 1.8;
  color: var(--chalk);
}

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

.page-about .hero-stats {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  background: var(--pitch-2);
  border: 2px solid var(--pitch-2);
}

.page-about .stat {
  display: flex;
  flex-direction: column-reverse;
  justify-content: flex-end;
  gap: 6px;
  padding: 16px 14px;
  background: var(--pitch);
}

.page-about .stat dt {
  font-size: 12px;
  line-height: 1.4;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .stat dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.6vw, 32px);
  font-weight: 700;
  line-height: 1;
  color: var(--neon);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-layout {
  padding-block: 48px 76px;
}

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

.page-about .rail-title {
  margin: 0 0 14px;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  border-left: 2px solid var(--pitch);
}

.page-about .rail-link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-left: -2px;
  padding: 10px 12px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.4;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.page-about .rail-link .num {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold);
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  color: var(--chalk);
  border-left-color: var(--neon);
  background: var(--pitch);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-block: 46px;
  border-top: 2px solid var(--pitch);
  scroll-margin-top: 28px;
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .section-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1.3;
  color: var(--white);
  margin: 10px 0 20px;
  max-width: 24ch;
}

.page-about .about-text {
  margin: 0 0 14px;
  max-width: 66ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--chalk);
}

/* ---------- 图文 ---------- */
.page-about .story-grid {
  display: grid;
  gap: 28px;
}

.page-about .story-text {
  min-width: 0;
}

.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 2px solid var(--ink-deep);
  box-shadow: 8px 8px 0 var(--pitch);
  background: var(--pitch);
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 14px;
  max-width: 44ch;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--mist);
}

.page-about .about-figure--board {
  margin-top: 30px;
  max-width: 540px;
}

.page-about .about-figure--archive {
  margin-top: 30px;
}

/* ---------- 五个小组 ---------- */
.page-about .squads {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .squad {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 8px;
  min-height: 124px;
  padding: 14px 13px;
  background: var(--pitch);
  border: 2px solid var(--ink-deep);
  box-shadow: 4px 4px 0 var(--gold);
  transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
}

.page-about .squad:nth-child(2),
.page-about .squad:nth-child(4) {
  background: var(--pitch-2);
}

.page-about .squad:nth-child(5) {
  background: var(--brick);
}

.page-about .squad-name {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.3;
  color: var(--white);
}

.page-about .squad-scope {
  font-size: 13px;
  line-height: 1.65;
  color: var(--chalk);
}

.page-about .squad:hover,
.page-about .squad:focus-within {
  transform: translateY(-4px);
  border-color: var(--neon);
  box-shadow: 4px 8px 0 var(--gold);
}

/* ---------- 五步流程 ---------- */
.page-about .flow {
  list-style: none;
  position: relative;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .flow::before {
  content: "";
  position: absolute;
  left: 25px;
  top: 30px;
  bottom: 30px;
  width: 2px;
  background: var(--pitch-2);
}

.page-about .flow-step {
  position: relative;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.page-about .flow-index {
  position: relative;
  z-index: 1;
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 2px solid var(--gold);
  background: var(--ink);
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--neon);
  transition: background var(--ease), border-color var(--ease), color var(--ease);
}

.page-about .flow-step:hover .flow-index,
.page-about .flow-step:focus-within .flow-index {
  background: var(--gold);
  border-color: var(--neon);
  color: var(--ink-deep);
}

.page-about .flow-card {
  min-width: 0;
  padding: 16px 18px 18px;
  background: var(--pitch);
  border: 2px solid var(--ink-deep);
  box-shadow: 6px 6px 0 var(--pitch-2);
  transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
}

.page-about .flow-step:hover .flow-card,
.page-about .flow-step:focus-within .flow-card {
  transform: translateY(-3px);
  border-color: var(--gold);
  box-shadow: 6px 10px 0 var(--pitch-2);
}

.page-about .flow-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 20px;
  line-height: 1.35;
  color: var(--white);
}

.page-about .flow-card p {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--chalk);
}

.page-about .flow-card .flow-detail {
  margin: 10px 0 0;
  padding-top: 10px;
  border-top: 1px dashed var(--pitch-2);
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 档案与数据 ---------- */
.page-about .archive-grid {
  display: grid;
  gap: 18px;
  margin-top: 26px;
}

.page-about .archive-card {
  min-width: 0;
  padding: 22px 20px 24px;
  background: var(--chalk);
  color: var(--ink);
  border: 2px solid var(--ink-deep);
  box-shadow: 8px 8px 0 var(--gold);
}

.page-about .archive-card h3 {
  margin: 0 0 12px;
  font-family: var(--font-serif);
  font-size: 21px;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .archive-card p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink);
}

.page-about .archive-list {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-about .archive-list li {
  position: relative;
  padding-left: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink);
}

.page-about .archive-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 2px;
  background: var(--pitch);
}

.page-about .archive-card .link {
  color: var(--pitch);
}

/* ---------- 合作 ---------- */
.page-about .partner-list {
  list-style: none;
  margin: 26px 0 22px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .partner-list li {
  padding: 18px 16px;
  background: var(--pitch);
  border: 2px solid var(--ink-deep);
  box-shadow: 4px 4px 0 var(--gold);
  font-size: 15px;
  line-height: 1.72;
  color: var(--chalk);
}

.page-about .partner-list strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.35;
  color: var(--white);
}

.page-about .partner-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 24px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 520px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .squads {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    align-items: end;
    gap: 10px;
  }

  .page-about .squad:nth-child(1) { min-height: 150px; }
  .page-about .squad:nth-child(2) { min-height: 200px; }
  .page-about .squad:nth-child(3) { min-height: 166px; }
  .page-about .squad:nth-child(4) { min-height: 214px; }
  .page-about .squad:nth-child(5) { min-height: 178px; }

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

  .page-about .flow-step {
    grid-template-columns: 58px minmax(0, 1fr);
    gap: 18px;
  }

  .page-about .flow-index {
    width: 58px;
    height: 58px;
    font-size: 17px;
  }

  .page-about .flow::before {
    left: 28px;
  }
}

@media (min-width: 860px) {
  .page-about .story-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.84fr);
    gap: 38px;
    align-items: start;
  }

  .page-about .archive-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px;
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.28fr) minmax(0, 1fr);
    gap: 48px;
    align-items: end;
  }

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

@media (min-width: 1000px) {
  .page-about .about-layout {
    display: grid;
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 32px;
  }

  .page-about .about-section {
    scroll-margin-top: 40px;
  }

  .page-about .flow-card {
    padding: 18px 22px 20px;
  }
}

@media (max-width: 519px) {
  .page-about .flow-step {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: 11px;
  }

  .page-about .flow-index {
    width: 44px;
    height: 44px;
    font-size: 14px;
  }

  .page-about .flow::before {
    left: 21px;
  }

  .page-about .about-figure img {
    box-shadow: 5px 5px 0 var(--pitch);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .squad,
  .page-about .flow-card,
  .page-about .flow-index,
  .page-about .rail-link {
    transition: none;
  }
}