.page-about {
  --about-index-w: 176px;
  --about-gap: clamp(26px, 4vw, 56px);
}

.page-about .content-shell {
  padding-bottom: clamp(40px, 6vw, 88px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(18px, 3vw, 30px) clamp(26px, 4vw, 44px);
  max-width: 1000px;
}

.page-about .about-hero .display {
  margin-top: 14px;
  color: var(--c-cream);
}

.page-about .hero-lede {
  margin-top: clamp(18px, 2.5vw, 28px);
  max-width: 62ch;
  font-size: clamp(1rem, 1.2vw, 1.0625rem);
  line-height: 1.85;
  color: var(--c-mist);
}

.page-about .stat-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 4vw, 44px);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .stat-cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px 20px;
  background: var(--c-panel);
}

.page-about .stat-num {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  line-height: 1;
  color: var(--c-amber);
  letter-spacing: -0.02em;
}

.page-about .stat-cell:nth-child(2) .stat-num {
  color: var(--c-teal);
}

.page-about .stat-label {
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--c-mist);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(30px, 5vw, 56px);
}

.page-about .about-figure--inset {
  margin-top: clamp(28px, 4vw, 44px);
  margin-bottom: 0;
}

.page-about .about-figure .media-frame {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
  background: var(--c-panel);
}

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

.page-about .media-caption {
  margin-top: 12px;
  font-size: 0.8125rem;
  color: var(--c-mist);
}

/* ---------- 两栏骨架 ---------- */
.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
}

.page-about .about-index {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line-soft);
  -webkit-overflow-scrolling: touch;
}

.page-about .index-item {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--c-mist);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .index-item:hover,
.page-about .index-item:focus-visible {
  border-color: var(--c-teal);
  color: var(--c-cream);
  outline: none;
}

.page-about .index-num {
  font-size: 0.6875rem;
  color: var(--c-amber);
}

.page-about .about-body {
  min-width: 0;
}

.page-about .about-block + .about-block {
  margin-top: clamp(34px, 5vw, 64px);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  margin-top: clamp(22px, 3vw, 34px);
  padding-left: 0;
  list-style: none;
}

.page-about .about-timeline .timeline-item {
  padding-bottom: clamp(20px, 3vw, 30px);
}

.page-about .about-timeline .timeline-label {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--c-amber);
}

.page-about .about-timeline .timeline-item--amber .timeline-label {
  color: var(--c-teal);
}

.page-about .about-timeline .timeline-title {
  margin-top: 6px;
  font-size: clamp(1.0625rem, 1.6vw, 1.25rem);
  color: var(--c-cream);
}

.page-about .about-timeline .timeline-text {
  margin-top: 8px;
  max-width: 60ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-mist);
}

/* ---------- 区域标签页 ---------- */
.page-about .region-tabs {
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .region-tabs .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .region-tabs .tab {
  padding: 8px 16px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  background: transparent;
  color: var(--c-mist);
  font: inherit;
  font-size: 0.875rem;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.page-about .region-tabs .tab:hover {
  border-color: var(--c-teal);
  color: var(--c-cream);
}

.page-about .region-tabs .tab:focus-visible {
  outline: 2px solid var(--c-amber);
  outline-offset: 2px;
}

.page-about .region-tabs .tab[aria-selected="true"] {
  border-color: var(--c-teal);
  background: rgba(25, 168, 122, 0.14);
  color: var(--c-cream);
}

.page-about .region-panel {
  margin-top: clamp(20px, 3vw, 30px);
  padding: clamp(20px, 3vw, 30px);
  background: var(--c-panel);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
}

.page-about .region-panel[hidden] {
  display: none;
}

.page-about .region-name {
  margin: 0 0 12px;
  font-size: clamp(1.375rem, 3vw, 2rem);
  font-weight: 300;
  letter-spacing: -0.01em;
  color: var(--c-cream);
}

.page-about .region-panel p {
  max-width: 58ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .region-hint {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  font-size: 0.8125rem;
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(24px, 3vw, 34px);
}

.page-about .team-bars {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-about .team-bar {
  display: grid;
  grid-template-columns: minmax(84px, 0.8fr) minmax(0, 2.6fr) auto;
  align-items: center;
  gap: 12px;
}

.page-about .bar-label {
  font-size: 0.875rem;
  color: var(--c-cream);
}

.page-about .bar-track {
  display: block;
  height: 10px;
  border-radius: 999px;
  background: rgba(159, 176, 200, 0.14);
  overflow: hidden;
}

.page-about .bar-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
}

.page-about .bar-fill--teal { background: linear-gradient(90deg, rgba(25, 168, 122, 0.55), var(--c-teal)); }
.page-about .bar-fill--amber { background: linear-gradient(90deg, rgba(224, 163, 46, 0.5), var(--c-amber)); }
.page-about .bar-fill--moss { background: linear-gradient(90deg, rgba(63, 107, 82, 0.6), var(--c-moss-light)); }
.page-about .bar-fill--mist { background: linear-gradient(90deg, rgba(159, 176, 200, 0.35), var(--c-mist)); }

.page-about .bar-num {
  font-size: 0.875rem;
  color: var(--c-cream);
  white-space: nowrap;
}

.page-about .team-note {
  padding: clamp(20px, 3vw, 28px);
  background: var(--c-panel);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--c-teal);
  border-radius: var(--radius-m);
}

.page-about .team-note-title {
  margin: 0 0 16px;
  font-size: 1.0625rem;
  font-weight: 500;
  color: var(--c-cream);
}

.page-about .response-list {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .response-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line-soft);
}

.page-about .response-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .response-row dt {
  font-size: 0.8125rem;
  color: var(--c-mist);
}

.page-about .response-row dd {
  margin: 0;
  font-size: 0.875rem;
  color: var(--c-cream);
}

.page-about .team-note .is-muted {
  margin-top: 16px;
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--c-mist);
}

/* ---------- 授权状态 ---------- */
.page-about .auth-grid,
.page-about .tier-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .auth-card,
.page-about .tier-card {
  padding: clamp(20px, 3vw, 26px);
  background: var(--c-panel);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
}

.page-about .auth-card .card-title,
.page-about .tier-card .card-title {
  margin: 14px 0 10px;
  font-size: 1.0625rem;
  color: var(--c-cream);
}

.page-about .auth-card .card-text,
.page-about .tier-card .card-text {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .tier-card {
  border-top: 3px solid var(--c-coral);
}

.page-about .auth-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 30px);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--c-mist);
}

/* ---------- 备案 ---------- */
.page-about .cred-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 36px);
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .cred-list {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .cred-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  padding: 14px 18px;
  background: var(--c-panel);
}

.page-about .cred-row dt {
  font-size: 0.8125rem;
  color: var(--c-mist);
}

.page-about .cred-row dd {
  margin: 0;
  font-size: 0.875rem;
  color: var(--c-cream);
}

.page-about .cred-text {
  align-self: center;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--c-mist);
}

.page-about .cred-text a {
  color: var(--c-teal);
  text-decoration: none;
  border-bottom: 1px solid rgba(25, 168, 122, 0.5);
}

.page-about .cred-text a:hover,
.page-about .cred-text a:focus-visible {
  border-bottom-color: var(--c-teal);
}

/* ---------- 收尾 ---------- */
.page-about .outro-title {
  margin-bottom: clamp(18px, 3vw, 26px);
}

.page-about .outro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .outro-card {
  display: grid;
  gap: 6px;
  padding: 20px 22px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: linear-gradient(135deg, var(--c-panel), rgba(34, 55, 92, 0.35));
  text-decoration: none;
  transition: border-color 0.22s ease, transform 0.22s ease;
}

.page-about .outro-card:hover,
.page-about .outro-card:focus-visible {
  border-color: var(--c-amber);
  transform: translateY(-2px);
  outline: none;
}

.page-about .outro-num {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--c-amber);
}

.page-about .outro-name {
  font-size: 1.0625rem;
  color: var(--c-cream);
}

.page-about .outro-desc {
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .outro-contact {
  margin-top: clamp(22px, 3vw, 30px);
  padding-top: 18px;
  border-top: 1px dashed var(--line-soft);
  font-size: 0.875rem;
  line-height: 1.9;
  color: var(--c-mist);
}

.page-about .outro-contact .mono {
  color: var(--c-cream);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .auth-grid,
  .page-about .tier-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .outro-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .stat-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .cred-layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

@media (min-width: 980px) {
  .page-about .about-grid {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: var(--about-gap);
  }
  .page-about .about-index {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    position: sticky;
    top: 26px;
    align-self: start;
    overflow: visible;
    padding-bottom: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line-soft);
  }
  .page-about .index-item {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 10px 0 10px 14px;
    margin-left: -1px;
  }
  .page-about .index-item:hover,
  .page-about .index-item:focus-visible {
    border-left-color: var(--c-teal);
    background: rgba(25, 168, 122, 0.06);
  }
  .page-about .index-label {
    font-size: 0.8125rem;
  }
}

@media (min-width: 1180px) {
  .page-about .tier-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .auth-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .index-item,
  .page-about .region-tabs .tab,
  .page-about .outro-card {
    transition: none;
  }
  .page-about .outro-card:hover,
  .page-about .outro-card:focus-visible {
    transform: none;
  }
}