.page-about {
  display: block;
}

.page-about .about-crumb {
  padding-top: var(--space-4);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  margin-top: var(--space-3);
  overflow: hidden;
}

.page-about .about-hero__media {
  position: relative;
  background-color: var(--color-contrast-surface);
}

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

.page-about .about-hero__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-content: end;
  gap: var(--space-6);
  padding-block: var(--space-8);
  min-height: clamp(380px, 66vh, 640px);
}

.page-about .about-hero__wordmark {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  z-index: 0;
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 0.8;
  letter-spacing: -0.05em;
  color: var(--color-contrast-accent);
  opacity: 0.2;
  pointer-events: none;
  user-select: none;
}

.page-about .about-hero__title {
  margin: var(--space-3) 0 var(--space-3);
  max-width: 20ch;
  font-family: var(--font-heading);
  font-size: clamp(var(--text-2xl), 7vw, var(--text-4xl));
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-about .about-hero__lede {
  margin: 0 0 var(--space-3);
  max-width: 58ch;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-about .about-hero__text {
  margin: 0;
  max-width: 62ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

/* ---------- 结构代际刻度 ---------- */

.page-about .hero-scale {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.page-about .hero-scale__caption {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-contrast-ink);
  opacity: 0.72;
}

.page-about .hero-scale__body {
  display: flex;
  gap: var(--space-2);
  height: calc(var(--space-1) * 27);
}

.page-about .hero-scale__svg {
  flex: 0 0 auto;
  width: 24px;
  height: 100%;
}

.page-about .hero-scale__axis {
  stroke: var(--color-contrast-line);
  stroke-width: 2;
}

.page-about .hero-scale__tick {
  stroke: var(--color-contrast-line);
  stroke-width: 2;
}

.page-about .hero-scale__tick--on {
  stroke: var(--color-contrast-accent);
  stroke-width: 3;
}

.page-about .hero-scale__list {
  flex: 1 1 auto;
  min-width: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.page-about .hero-scale__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: color-mix(in srgb, var(--color-contrast-ink) 80%, transparent);
  border-bottom: var(--border-thin) solid transparent;
}

.page-about .hero-scale__link:hover,
.page-about .hero-scale__link:focus-visible {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
}

.page-about .hero-scale__link--on {
  color: var(--color-contrast-accent);
}

/* ---------- 通用标题 ---------- */

.page-about .about-line__head,
.page-about .about-coverage__head,
.page-about .about-team__head {
  max-width: var(--measure);
  margin-bottom: var(--space-6);
}

.page-about .about-line__title,
.page-about .about-coverage__title,
.page-about .about-boundary__title,
.page-about .about-team__title,
.page-about .about-rules__title {
  margin: var(--space-2) 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: clamp(var(--text-xl), 3.4vw, var(--text-2xl));
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

/* ---------- 结构沿革 ---------- */

.page-about .about-line__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-about .gen-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .gen-item {
  position: relative;
  padding: var(--space-6) 0;
  scroll-margin-top: calc(var(--space-8) * 1.6);
}

.page-about .gen-item::before {
  content: "";
  position: absolute;
  top: 0;
  inset-inline: 0;
  height: 3px;
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-about .gen-item__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-1) var(--space-3);
  margin-bottom: var(--space-2);
}

.page-about .gen-item__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

.page-about .gen-item--current .gen-item__idx {
  color: var(--color-primary);
}

.page-about .gen-item__metric {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.page-about .gen-item__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-about .gen-item__text {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

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

.page-about .about-line__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-line__caption {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-muted);
}

/* ---------- 收录范围 ---------- */

.page-about .about-coverage__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-about .about-coverage__text {
  margin: 0 0 var(--space-6);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-4);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.page-about .about-stat__value {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.page-about .about-stat__label {
  max-width: 26ch;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-muted);
}

/* ---------- 能力边界 ---------- */

.page-about .about-boundary__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.page-about .about-boundary__text {
  margin: 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-about .about-boundary__list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-about .about-boundary__list li {
  position: relative;
  padding: var(--space-3) 0 var(--space-3) var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.page-about .about-boundary__list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--color-ink-muted);
}

/* ---------- 团队 ---------- */

.page-about .about-team__table {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* ---------- 校验与关系 ---------- */

.page-about .about-rules__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

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

.page-about .about-rules__row {
  padding: var(--space-4) 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-about .about-rules__row:last-child {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-about .about-rules__row dt {
  margin-bottom: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-about .about-rules__row dd {
  margin: 0;
  max-width: 60ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

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

.page-about .about-rules__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 6;
  object-fit: cover;
}

.page-about .about-rules__caption {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-muted);
}

/* ---------- 收口 ---------- */

.page-about .about-outro {
  padding-block: var(--section-y) var(--section-y-lg);
}

.page-about .about-outro__lead {
  margin: 0 0 var(--space-4);
  max-width: 42ch;
  font-family: var(--font-heading);
  font-size: clamp(var(--text-lg), 3vw, var(--text-xl));
  font-weight: var(--weight-heading);
  line-height: 1.5;
  color: var(--color-ink);
}

.page-about .about-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
  margin-bottom: var(--space-6);
}

.page-about .about-outro__contact {
  margin: 0;
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-ink-muted);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-6);
  }

  .page-about .about-stat:nth-child(2n) {
    margin-top: var(--space-6);
  }
}

@media (min-width: 720px) {
  .page-about .about-team__table .data-table {
    min-width: 100%;
  }
}

@media (max-width: 719px) {
  .page-about .about-team__table .data-table {
    min-width: 620px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 2.1fr) minmax(0, 1fr);
    align-items: end;
    gap: var(--space-8);
  }

  .page-about .about-line__layout {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-about .about-line__figure {
    position: sticky;
    top: calc(var(--space-8) * 1.5);
  }

  .page-about .about-coverage__grid {
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-about .about-boundary__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: var(--space-8);
  }

  .page-about .about-rules__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: var(--space-8);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .gen-item,
  .page-about .about-stat {
    transition-delay: 0ms;
  }
}