.page-about {
  background-color: var(--color-surface);
  color: var(--color-ink);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding-top: var(--space-4);
}

/* ---------- 开篇 ---------- */
.page-about .about-intro {
  padding-top: var(--space-6);
}

.page-about .about-intro__grid {
  display: grid;
  gap: var(--space-6);
  align-items: start;
}

.page-about .about-intro h1 {
  margin: var(--space-2) 0 var(--space-4);
  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);
  max-width: 21ch;
}

.page-about .eyebrow {
  color: var(--color-primary);
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

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

.page-about .about-intro__body {
  margin: 0 0 var(--space-4);
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

.page-about .about-intro__facts {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: var(--space-3) 0 0;
  border-top: 1px dashed var(--color-line);
  display: grid;
  gap: var(--space-3);
}

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

.page-about .about-intro__facts .data-label {
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
}

.page-about .about-intro__facts strong {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  word-break: break-word;
}

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

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

.page-about .figure--wide img {
  aspect-ratio: 3 / 2;
}

.page-about .figure--banner img {
  aspect-ratio: 8 / 3;
}

.page-about .figure--square img {
  aspect-ratio: 1 / 1;
}

.page-about .figure-caption {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
}

.page-about .about-intro__figure {
  border-top: var(--border-thick) solid var(--color-primary);
  padding-top: var(--space-2);
}

/* ---------- 通用小节 ---------- */
.page-about .about-lead {
  margin: var(--space-3) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-about .section-head h2 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  margin: 0;
}

/* ---------- 读者群 ---------- */
.page-about .about-who__grid {
  margin-top: var(--space-6);
  display: grid;
  gap: var(--space-4);
}

.page-about .about-who__item {
  padding: var(--space-3) 0 0;
  border-top: var(--border-thick) solid var(--color-surface-deep);
}

.page-about .about-who__item:nth-child(1) {
  border-top-color: var(--color-primary);
}

.page-about .about-who__item:nth-child(2) {
  border-top-color: var(--color-accent);
}

.page-about .about-who__item:nth-child(4) {
  border-top-color: var(--color-contrast-surface);
}

.page-about .about-who__item .data-label {
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  margin: 0 0 var(--space-1);
}

.page-about .about-who__item h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}

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

/* ---------- 发展脉络 ---------- */
.page-about .about-path__banner {
  margin-top: var(--space-6);
}

.page-about .about-path__track {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-6);
}

.page-about .about-path__node {
  position: relative;
  padding-top: var(--space-4);
  border-top: 1px dashed var(--color-line);
  outline-offset: var(--space-1);
  transition: border-color 0.24s ease;
}

.page-about .about-path__node:hover,
.page-about .about-path__node:focus {
  border-top-color: var(--color-primary);
}

.page-about .about-path__node:focus-visible {
  outline: var(--border-thin) solid var(--color-focus);
}

.page-about .about-path__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--space-6);
  height: var(--space-6);
  margin-bottom: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
}

.page-about .about-path__node h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}

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

.page-about .about-path__extra {
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
}

/* ---------- 数据能力 ---------- */
.page-about .about-capacity {
  background-color: var(--color-surface-alt);
}

.page-about .about-capacity__list {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.page-about .about-capacity__item {
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-about .about-capacity__item .data-label {
  margin: 0;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
}

.page-about .about-capacity__num {
  margin: var(--space-2) 0 var(--space-2);
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.page-about .about-capacity__num span {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-body);
  color: var(--color-ink-muted);
}

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

.page-about .about-capacity__sep {
  margin: var(--space-6) 0;
}

.page-about .about-capacity__note-row {
  display: grid;
  gap: var(--space-4);
}

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

.page-about .about-capacity__note-row a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 0.22em;
}

.page-about .about-capacity__note-row a:hover,
.page-about .about-capacity__note-row a:focus-visible {
  color: var(--color-focus);
}

/* ---------- 运营原则 ---------- */
.page-about .about-principles__layout {
  margin-top: var(--space-6);
  display: grid;
  gap: var(--space-6);
}

.page-about .about-principles__quote {
  margin: 0;
  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-principles__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-principles__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-3);
  padding: var(--space-4) 0;
  border-bottom: 1px dashed var(--color-line);
}

.page-about .about-principles__item:first-child {
  padding-top: 0;
}

.page-about .about-principles__num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-accent);
  padding-top: 0.35em;
}

.page-about .about-principles__item h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}

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

.page-about .about-principles__item a {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 0.22em;
}

.page-about .about-principles__item a:hover,
.page-about .about-principles__item a:focus-visible {
  color: var(--color-focus);
}

/* ---------- 团队 ---------- */
.page-about .about-team__layout {
  margin-top: var(--space-6);
  display: grid;
  gap: var(--space-6);
  align-items: start;
}

.page-about .about-team__figure {
  border-top: var(--border-thick) solid var(--color-accent);
  padding-top: var(--space-2);
}

.page-about .about-team__roles {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-team__role {
  padding: var(--space-2) 0 var(--space-2) var(--space-3);
  border-left: var(--border-thick) solid var(--color-primary);
}

.page-about .about-team__role:nth-child(2) {
  border-left-color: var(--color-accent);
}

.page-about .about-team__role:nth-child(3) {
  border-left-color: var(--color-contrast-surface);
}

.page-about .about-team__role .data-label {
  margin: 0 0 var(--space-1);
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
}

.page-about .about-team__role h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}

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

/* ---------- 主体与备案 ---------- */
.page-about .about-credentials {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-about .about-credentials h2,
.page-about .about-credentials h3 {
  color: var(--color-contrast-ink);
}

.page-about .about-credentials .about-lead {
  color: var(--color-contrast-ink);
  opacity: 0.82;
}

.page-about .about-credentials .data-label {
  color: var(--color-contrast-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
}

.page-about .about-credentials__grid {
  margin-top: var(--space-6);
  display: grid;
  gap: var(--space-6);
}

.page-about .about-credentials__list {
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .about-credentials__list > div {
  padding: var(--space-3) 0;
  border-bottom: 1px dashed var(--color-contrast-line);
}

.page-about .about-credentials__list > div:first-child {
  padding-top: 0;
}

.page-about .about-credentials__list dt {
  margin-bottom: var(--space-1);
}

.page-about .about-credentials__list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  word-break: break-word;
}

.page-about .about-credentials__list > div:last-child dd {
  font-family: var(--font-body);
  color: var(--color-contrast-ink);
  opacity: 0.82;
}

.page-about .about-credentials__contact h3 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}

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

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

.page-about .about-contact-list span:not(.data-label),
.page-about .about-contact-list a {
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-about .about-contact-list a {
  color: var(--color-contrast-accent);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 0.22em;
  word-break: break-word;
}

.page-about .about-contact-list a:hover,
.page-about .about-contact-list a:focus-visible {
  text-decoration-style: solid;
}

.page-about .about-credentials__note {
  margin: var(--space-4) 0 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
  opacity: 0.78;
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-contrast-line);
}

.page-about .about-credentials__links {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: var(--space-3) 0 0;
  border-top: 1px dashed var(--color-contrast-line);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
}

.page-about .about-credentials__links a {
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 0.24em;
}

.page-about .about-credentials__links a:hover,
.page-about .about-credentials__links a:focus-visible {
  color: var(--color-contrast-accent);
  text-decoration-style: solid;
}

/* ---------- 全局焦点兜底 ---------- */
.page-about a:focus-visible,
.page-about [tabindex]:focus-visible {
  outline: var(--border-thin) solid var(--color-focus);
  outline-offset: 2px;
}

.page-about .about-credentials a:focus-visible,
.page-about .about-credentials [tabindex]:focus-visible {
  outline-color: var(--color-contrast-accent);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-who__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-4) var(--space-6);
  }

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

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

@media (min-width: 760px) {
  .page-about .section-head h2 {
    font-size: var(--text-2xl);
  }

  .page-about .about-path__track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--space-3);
  }

  .page-about .about-principles__layout {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-about .about-principles__quote {
    font-size: var(--text-xl);
    position: sticky;
    top: var(--space-8);
  }
}

@media (min-width: 900px) {
  .page-about .about-intro__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: var(--space-8);
    align-items: end;
  }

  .page-about .about-intro h1 {
    font-size: var(--text-3xl);
  }

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

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

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

  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
    gap: var(--space-8);
  }

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

@media (hover: hover) and (pointer: fine) and (min-width: 760px) {
  .page-about .about-path__extra {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.28s ease, opacity 0.28s ease, margin-top 0.28s ease;
    margin-top: 0;
  }

  .page-about .about-path__node:hover .about-path__extra,
  .page-about .about-path__node:focus .about-path__extra,
  .page-about .about-path__node:focus-visible .about-path__extra {
    max-height: 14rem;
    opacity: 1;
    margin-top: var(--space-2);
  }
}