.page-about {
  --about-rule: color-mix(in srgb, var(--color-line) 70%, transparent);
  --about-glow: color-mix(in srgb, var(--color-primary) 34%, transparent);
}

.page-about .breadcrumb {
  margin-top: var(--space-4);
}

/* ---------- 首屏叙事 ---------- */
.page-about .about-lead {
  padding-top: var(--space-6);
}

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

.page-about .about-lead__eyebrow,
.page-about .about-stage__meta,
.page-about .about-scale__eyebrow,
.page-about .about-legal__eyebrow,
.page-about .about-scope__note-label,
.page-about .about-legal__aside-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
  margin: 0 0 var(--space-2);
}

.page-about .about-legal__eyebrow,
.page-about .about-scope__note-label,
.page-about .about-legal__aside-label {
  color: var(--color-primary);
}

.page-about .about-lead__title {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-3);
  text-wrap: balance;
}

.page-about .about-lead__lede {
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-ink);
  max-width: var(--measure);
  margin: 0 0 var(--space-3);
}

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

.page-about .about-lead__para a,
.page-about .about-principle__text a,
.page-about .about-legal__para a,
.page-about .about-legal__links a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 45%, transparent);
  transition: border-color 140ms linear, color 140ms linear;
}

.page-about .about-lead__para a:hover,
.page-about .about-principle__text a:hover,
.page-about .about-legal__para a:hover,
.page-about .about-legal__links a:hover {
  color: var(--color-focus);
  border-color: var(--color-focus);
}

.page-about .about-lead__para a:focus-visible,
.page-about .about-principle__text a:focus-visible,
.page-about .about-legal__para a:focus-visible,
.page-about .about-legal__links a:focus-visible,
.page-about .about-legal__links a:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.page-about .about-lead__figure {
  margin: 0;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-alt);
  box-shadow: 0 0 0 1px var(--about-glow), 0 0 42px color-mix(in srgb, var(--color-primary) 22%, transparent);
}

.page-about .about-lead__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 9 / 11;
  object-fit: cover;
}

.page-about .about-lead__caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: var(--space-6) var(--space-3) var(--space-3);
  background: var(--overlay-scrim);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-contrast-ink);
}

/* ---------- 发展阶段 ---------- */
.page-about .about-phases__head {
  max-width: var(--measure);
}

.page-about .about-phases__title,
.page-about .about-scope__title,
.page-about .about-principles__title,
.page-about .about-scale__title,
.page-about .about-legal__title {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-2);
}

.page-about .about-phases__figure {
  margin: var(--space-6) 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-alt);
}

.page-about .about-phases__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-phases__list {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
}

.page-about .about-stage {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  padding: var(--space-4) 0;
  transition: background-color 160ms linear;
}

.page-about .about-stage__no {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--color-ink-muted);
  transition: color 160ms linear, text-shadow 160ms linear;
}

.page-about .about-stage:hover .about-stage__no,
.page-about .about-stage:focus-within .about-stage__no {
  color: var(--color-primary);
  text-shadow: 0 0 18px var(--about-glow);
}

.page-about .about-stage__title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  margin: 0 0 var(--space-1);
}

.page-about .about-stage__text {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  margin: 0 0 var(--space-2);
  max-width: var(--measure);
}

.page-about .about-stage__meta {
  margin: 0;
  letter-spacing: 0.1em;
}

/* ---------- 内容能力与边界 ---------- */
.page-about .about-scope__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

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

.page-about .about-scope__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-about .about-scope__list li {
  position: relative;
  padding-left: var(--space-4);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-about .about-scope__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 14px;
  height: var(--border-thick);
  background: var(--color-primary);
}

.page-about .about-scope__block--out .about-scope__list li {
  color: var(--color-ink-soft);
}

.page-about .about-scope__block--out .about-scope__list li::before {
  background: var(--color-line);
}

.page-about .about-scope__note {
  align-self: start;
}

.page-about .about-scope__note p:last-child {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

/* ---------- 运营原则 ---------- */
.page-about .about-principles__head {
  max-width: var(--measure);
}

.page-about .about-principles__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.page-about .about-principle {
  background: var(--color-surface-alt);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  transition: background-color 160ms linear, box-shadow 160ms linear, transform 160ms linear;
}

.page-about .about-principle__no {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-2);
  transition: color 160ms linear;
}

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

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

.page-about .about-principle:hover,
.page-about .about-principle:focus-within {
  background: var(--color-surface-deep);
  box-shadow: 0 0 0 1px var(--color-primary), 0 0 26px var(--about-glow);
  transform: translateY(-2px);
}

.page-about .about-principle:hover .about-principle__no,
.page-about .about-principle:focus-within .about-principle__no {
  color: var(--color-accent);
}

/* ---------- 规模与团队 ---------- */
.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.page-about .about-scale__panel {
  padding: var(--space-6) var(--space-4);
  border-radius: var(--radius-lg);
}

.page-about .about-scale__eyebrow {
  color: var(--color-contrast-accent);
  margin-bottom: var(--space-2);
}

.page-about .about-scale__title {
  color: var(--color-contrast-ink);
  font-size: var(--text-3xl);
  margin-bottom: var(--space-2);
}

.page-about .about-scale__lede {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  margin: 0;
  max-width: 46ch;
}

.page-about .about-scale__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4) var(--space-3);
  margin-top: var(--space-6);
}

.page-about .about-scale__num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  color: var(--color-contrast-accent);
}

.page-about .about-scale__label {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-contrast-ink);
}

.page-about .about-scale__side {
  display: grid;
  gap: var(--space-4);
  align-content: start;
}

.page-about .about-scale__figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface-alt);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-accent) 26%, transparent);
}

.page-about .about-scale__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .about-scale__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.page-about .about-scale__facts li {
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-ink-soft);
  padding-left: var(--space-3);
  position: relative;
}

.page-about .about-scale__facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: var(--space-2);
  height: var(--border-thin);
  background: var(--color-accent);
}

.page-about .about-scale__facts b {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-accent);
  margin-right: 0.35em;
}

/* ---------- 备案与联系 ---------- */
.page-about .about-legal__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

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

.page-about .about-legal__dl {
  margin: var(--space-6) 0 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
}

.page-about .about-legal__dl > div {
  background: var(--color-surface-alt);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  transition: background-color 150ms linear, box-shadow 150ms linear;
}

.page-about .about-legal__dl > div:hover {
  background: var(--color-surface-deep);
  box-shadow: 0 0 0 1px var(--about-rule);
}

.page-about .about-legal__dl dt {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-1);
}

.page-about .about-legal__dl dd {
  margin: 0;
  font-size: var(--text-base);
  line-height: 1.5;
  color: var(--color-ink);
  overflow-wrap: break-word;
}

.page-about .about-legal__aside {
  align-self: start;
}

.page-about .about-legal__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-principles__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4);
  }

  .page-about .about-scope__main {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-6);
  }

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

@media (min-width: 900px) {
  .page-about .about-lead {
    padding-top: var(--space-8);
  }

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

  .page-about .about-lead__figure img {
    aspect-ratio: 9 / 11;
  }

  .page-about .about-scope__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 1fr);
    gap: var(--space-8);
  }

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

  .page-about .about-scale__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: var(--space-8);
  }

  .page-about .about-scale__panel {
    padding: var(--space-8) var(--space-6);
  }

  .page-about .about-scale__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-principles__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-legal__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-8);
  }

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

@media (min-width: 1080px) {
  .page-about .about-lead__title {
    font-size: var(--text-4xl);
  }

  .page-about .about-stage {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: var(--space-6);
    padding: var(--space-6) var(--space-3);
    border-radius: var(--radius-lg);
  }

  .page-about .about-stage:hover,
  .page-about .about-stage:focus-within {
    background: var(--color-surface-alt);
  }

  .page-about .about-stage__text {
    max-width: 60ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-principle:hover,
  .page-about .about-principle:focus-within {
    transform: none;
  }

  .page-about .about-principle,
  .page-about .about-stage,
  .page-about .about-stage__no,
  .page-about .about-legal__dl > div {
    transition: none;
  }
}