.page-about {
  --about-gap: clamp(56px, 9vw, 118px);
  --about-hair: rgba(34, 230, 211, 0.35);
}

.page-about .breadcrumb {
  padding-top: clamp(20px, 4vw, 34px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(28px, 5vw, 52px) 0 clamp(40px, 7vw, 84px);
}

.page-about .about-hero__inner {
  max-width: 1000px;
}

.page-about .about-hero__title {
  font-size: clamp(30px, 6vw, 68px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin: 18px 0 0;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin-top: clamp(18px, 3vw, 28px);
  max-width: 62ch;
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-fact {
  background: var(--panel);
  padding: clamp(16px, 2.4vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 40px);
  font-weight: 500;
  line-height: 1.1;
  color: var(--text);
  padding-bottom: 9px;
  background-image: linear-gradient(90deg, var(--amber), var(--amber));
  background-size: 36px 3px;
  background-position: 0 100%;
  background-repeat: no-repeat;
}

.page-about .about-fact__label {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding: var(--about-gap) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .timeline-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 56px);
}

.page-about .timeline-rail {
  min-width: 0;
}

.page-about .rail-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .rail-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--muted);
  text-decoration: none;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .rail-link .mono {
  font-size: 13px;
  color: var(--cyan);
}

.page-about .rail-link__txt {
  font-size: 13px;
}

.page-about .rail-link:hover,
.page-about .rail-link:focus-visible {
  border-color: var(--cyan);
  color: var(--text);
  background: var(--glass);
}

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

.page-about .timeline-item {
  position: relative;
  padding-left: 26px;
  border-left: 1px solid var(--line-soft);
  margin-top: clamp(32px, 5vw, 56px);
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(34, 230, 211, 0.14), 0 0 14px rgba(34, 230, 211, 0.55);
}

.page-about .timeline-item:target::before {
  background: var(--magenta);
  box-shadow: 0 0 0 5px rgba(255, 61, 139, 0.18), 0 0 18px rgba(255, 61, 139, 0.65);
}

.page-about .timeline-year {
  font-size: clamp(22px, 3.4vw, 34px);
  color: var(--text);
  margin: 0;
  letter-spacing: 0.02em;
}

.page-about .timeline-title {
  margin: 8px 0 12px;
  font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .timeline-item p {
  color: var(--muted);
  max-width: 68ch;
  margin: 0 0 12px;
}

.page-about .timeline-hint {
  display: block;
  border-left: 2px solid var(--amber);
  padding: 2px 0 2px 12px;
  font-size: 14px;
  color: var(--text);
}

@media (hover: hover) {
  .page-about .timeline-hint {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    padding-top: 0;
    padding-bottom: 0;
    transition: max-height 0.3s var(--ease), opacity 0.25s var(--ease), padding 0.3s var(--ease);
  }

  .page-about .timeline-item:hover .timeline-hint,
  .page-about .timeline-item:focus-within .timeline-hint {
    max-height: 8em;
    opacity: 1;
    padding-top: 4px;
    padding-bottom: 4px;
  }
}

/* ---------- 大字停顿 ---------- */
.page-about .about-pause {
  padding: clamp(40px, 10vw, 104px) 0 clamp(28px, 5vw, 56px);
}

.page-about .about-pause__text {
  margin: 0;
  max-width: 18ch;
  font-size: clamp(26px, 5.4vw, 62px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.03em;
  color: var(--text);
  background: linear-gradient(96deg, var(--cyan) 0%, var(--text) 46%, var(--magenta) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---------- 内容方法论 ---------- */
.page-about .about-method {
  padding: var(--about-gap) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .method-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 5vw, 64px);
  align-items: start;
}

.page-about .flow-list {
  list-style: none;
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
}

.page-about .flow-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2vw, 24px);
  padding: clamp(18px, 2.6vw, 26px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .flow-item__idx {
  font-size: 15px;
  color: var(--cyan);
  letter-spacing: 0.08em;
  padding-top: 3px;
}

.page-about .flow-item__title {
  margin: 0 0 6px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text);
}

.page-about .flow-item p {
  margin: 0;
  color: var(--muted);
  max-width: 60ch;
}

.page-about .method-note {
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: var(--glass);
  border-left: 2px solid var(--magenta);
  color: var(--text);
  font-size: 15px;
}

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

.page-about .method-figure .media {
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.page-about .method-caption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: var(--about-gap) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
  margin-top: clamp(26px, 4vw, 44px);
}

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

.page-about .team-figure .media {
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.page-about .team-caption {
  margin-top: 12px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .team-side {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
  min-width: 0;
}

.page-about .team-count {
  padding: clamp(18px, 2.6vw, 26px);
}

.page-about .team-count__title {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text);
}

.page-about .role-bars {
  display: grid;
  gap: 16px;
  margin-top: 16px;
}

.page-about .role-bar__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font-size: 14px;
  color: var(--text);
  margin-bottom: 8px;
}

.page-about .role-bar__head .num {
  color: var(--cyan);
}

.page-about .team-count__note {
  margin: 18px 0 0;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 标签页 ---------- */
.page-about .tablist {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-tab {
  flex: 0 0 auto;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-family: inherit;
  font-size: 14px;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-tab:hover,
.page-about .about-tab:focus-visible {
  color: var(--text);
  border-color: var(--cyan);
}

.page-about .about-tab[aria-selected="true"] {
  color: var(--ink);
  background: linear-gradient(96deg, var(--cyan), var(--magenta));
  border-color: transparent;
  font-weight: 700;
}

.page-about .about-panel {
  padding-top: clamp(18px, 3vw, 26px);
}

.page-about .about-panel + .about-panel {
  margin-top: clamp(18px, 3vw, 26px);
  border-top: 1px solid var(--line-soft);
}

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

.page-about .duty-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .duty-list .tag {
  flex: 0 0 auto;
  align-self: start;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  padding: var(--about-gap) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .partner-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 24px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .partner-card {
  padding: clamp(20px, 2.8vw, 28px);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .partner-card:hover {
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.page-about .partner-card__idx {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .partner-card__title {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .partner-card p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 15px;
}

.page-about .partner-card__meta {
  font-size: 13px;
  color: var(--text);
  border-top: 1px solid var(--line-soft);
  padding-top: 12px;
  margin-bottom: 0;
}

.page-about .partner-cta-line {
  margin: clamp(24px, 3.4vw, 34px) 0 0;
  color: var(--muted);
  font-size: 15px;
}

.page-about .inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .inline-link:hover,
.page-about .inline-link:focus-visible {
  border-bottom-color: var(--cyan);
  color: var(--text);
}

/* ---------- 重庆与西南 ---------- */
.page-about .about-region {
  padding: var(--about-gap) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .region-figure {
  margin: 0 0 clamp(26px, 4vw, 44px);
}

.page-about .region-figure .media {
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.page-about .region-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-about .region-copy p {
  color: var(--muted);
  max-width: 62ch;
}

.page-about .region-copy .section-head__title {
  margin: 14px 0 20px;
}

.page-about .region-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
  align-self: start;
}

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

.page-about .region-fact__num {
  font-size: clamp(22px, 3.4vw, 32px);
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .region-fact__label {
  font-size: 13px;
  color: var(--muted);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: var(--about-gap) 0 clamp(64px, 10vw, 120px);
  border-top: 1px solid var(--line-soft);
}

.page-about .cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 36px);
  align-items: end;
}

.page-about .cta-title {
  margin: 0 0 12px;
  font-size: clamp(24px, 4vw, 42px);
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .cta-lede {
  margin: 0;
  color: var(--muted);
  max-width: 56ch;
}

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

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

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

@media (min-width: 900px) {
  .page-about .timeline-grid {
    grid-template-columns: 132px minmax(0, 1fr);
  }

  .page-about .timeline-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .rail-list {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
  }

  .page-about .rail-link {
    justify-content: flex-start;
    width: 100%;
    padding: 9px 10px;
  }

  .page-about .method-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .region-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.85fr);
  }

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

  .page-about .cta-inner {
    grid-template-columns: minmax(0, 1.4fr) auto;
  }
}