.page-about {
  background: var(--c-mist);
  color: var(--c-ink);
  padding-bottom: clamp(36px, 7vw, 88px);
}

.page-about .section {
  padding: clamp(44px, 7vw, 84px) 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background: linear-gradient(180deg, #0B2440 0%, #071A2E 100%);
  color: var(--c-paper);
  padding: clamp(20px, 4vw, 36px) 0 clamp(34px, 5vw, 56px);
}

.page-about .about-hero .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(18px, 3vw, 30px);
  padding: 0;
  list-style: none;
  font-size: 0.8125rem;
}

.page-about .about-hero .breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  opacity: 0.45;
}

.page-about .about-hero .breadcrumb a {
  color: rgba(244, 246, 249, 0.78);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb a:hover,
.page-about .about-hero .breadcrumb a:focus-visible {
  color: var(--c-yellow);
}

.page-about .about-hero .breadcrumb [aria-current="page"] {
  color: var(--c-yellow);
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(20px, 3vw, 40px);
}

.page-about .kicker {
  margin: 0;
  font-family: var(--font-num);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-yellow);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7vw, 4.2rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.page-about .about-hero h1::after {
  content: "";
  display: block;
  width: 72px;
  height: 6px;
  margin-top: clamp(18px, 2.4vw, 26px);
  border-radius: 3px;
  background: linear-gradient(90deg, var(--c-red), var(--c-yellow));
}

.page-about .lede {
  margin: 0;
  max-width: 34em;
  font-size: 1rem;
  line-height: 1.78;
  color: rgba(244, 246, 249, 0.84);
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .stat-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .stat {
  background: var(--c-paper);
  border-radius: var(--r-lg);
  border-top: 4px solid var(--c-red);
  padding: 16px 18px;
  box-shadow: var(--shadow-1);
}

.page-about .stat:nth-child(2) {
  border-top-color: var(--c-yellow);
}

.page-about .stat:nth-child(3) {
  border-top-color: var(--c-blue);
}

.page-about .stat:nth-child(4) {
  border-top-color: var(--c-cyan);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-ink);
}

.page-about .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 0.8125rem;
  color: var(--c-gray);
}

.page-about .about-toc {
  display: flex;
  gap: 8px;
  margin-top: clamp(22px, 3vw, 32px);
  padding: 18px 0 4px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-toc a {
  flex: 0 0 auto;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(255, 255, 255, 0.24);
  color: rgba(244, 246, 249, 0.84);
  text-decoration: none;
  font-size: 0.8125rem;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  background: var(--c-yellow);
  border-color: var(--c-yellow);
  color: var(--c-ink);
}

/* ---------- 章节标题 ---------- */
.page-about .section-head {
  max-width: 46rem;
  margin-bottom: clamp(22px, 3.4vw, 36px);
}

.page-about .index-num {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--c-red);
}

.page-about .section-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.45rem, 3.6vw, 2.35rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--c-ink);
}

.page-about .section-sub {
  margin: 12px 0 0;
  max-width: 40em;
  line-height: 1.75;
  color: var(--c-gray);
}

/* ---------- 01 为谁服务 ---------- */
.page-about .serve-grid {
  display: grid;
  gap: var(--gap);
}

.page-about .serve-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--c-paper);
  border: 1px solid var(--c-track);
  border-radius: var(--r-xl);
  padding: clamp(20px, 2.6vw, 28px);
  box-shadow: var(--shadow-1);
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .serve-card--red {
  border-top: 5px solid var(--c-red);
}

.page-about .serve-card--yellow {
  border-top: 5px solid var(--c-yellow);
}

.page-about .serve-card--blue {
  border-top: 5px solid var(--c-blue);
}

.page-about .serve-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
}

.page-about .serve-card h3 {
  margin: 0;
  font-size: 1.15rem;
  line-height: 1.32;
  color: var(--c-ink);
}

.page-about .serve-card p {
  margin: 0;
  line-height: 1.75;
  color: var(--c-gray);
}

.page-about .serve-meta {
  margin-top: auto;
  padding-top: 10px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--c-blue);
}
/* ---------- 02 场馆覆盖 ---------- */
.page-about .scope-grid {
  display: grid;
  gap: var(--gap);
}

.page-about .scope-media {
  margin: 0;
  background: var(--c-paper);
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

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

.page-about .scope-media figcaption {
  padding: 14px 18px;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--c-gray);
  background: var(--c-paper);
}

.page-about .scope-panel {
  background: var(--c-paper);
  border: 1px solid var(--c-track);
  border-radius: var(--r-xl);
  padding: clamp(18px, 2.6vw, 26px);
  box-shadow: var(--shadow-1);
}

.page-about .region-list {
  display: grid;
  gap: 12px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .region-card {
  background: var(--c-mist);
  border-left: 5px solid var(--c-blue);
  border-radius: var(--r-lg);
  padding: 16px 18px;
}

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

.page-about .region-num {
  margin: 0 0 4px;
  font-family: var(--font-num);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-red);
}

.page-about .region-card h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  color: var(--c-ink);
}

.page-about .region-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--c-gray);
}

.page-about .scope-note {
  margin: 16px 0 0;
  font-size: 0.8125rem;
  line-height: 1.65;
  color: var(--c-gray);
}

/* ---------- 03 内容节奏 ---------- */
.page-about .lines-grid {
  display: grid;
  gap: var(--gap);
  align-items: start;
}

.page-about .line-card {
  background: var(--c-paper);
  border: 1px solid var(--c-track);
  border-radius: var(--r-xl);
  padding: clamp(20px, 2.6vw, 28px);
  box-shadow: var(--shadow-1);
}

.page-about .line-card h3 {
  margin: 14px 0 10px;
  font-size: 1.15rem;
  line-height: 1.32;
  color: var(--c-ink);
}

.page-about .line-card p {
  margin: 0 0 12px;
  line-height: 1.75;
  color: var(--c-gray);
}

.page-about .line-when {
  margin: 0;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--c-blue);
}

/* ---------- 04 改版历程 ---------- */
.page-about .history-grid {
  display: grid;
  gap: var(--gap);
  align-items: start;
}

.page-about .history-media {
  margin: 0;
  background: var(--c-paper);
  border-radius: var(--r-xl);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

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

.page-about .history-media figcaption {
  padding: 14px 18px;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--c-gray);
}

.page-about .timeline {
  position: relative;
  padding-left: 26px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 12px;
  width: 4px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--c-red), var(--c-yellow));
}

.page-about .tl-node {
  position: relative;
  margin-bottom: 14px;
  background: var(--c-paper);
  border: 1px solid var(--c-track);
  border-radius: var(--r-lg);
  padding: 14px 18px;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 22px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-red);
  box-shadow: 0 0 0 4px rgba(225, 29, 46, 0.14);
}

.page-about .tl-node[open]::before {
  background: var(--c-yellow);
  box-shadow: 0 0 0 4px rgba(255, 194, 46, 0.2);
}

.page-about .tl-node summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
  list-style: none;
}

.page-about .tl-node summary::-webkit-details-marker {
  display: none;
}

.page-about .tl-node summary:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 4px;
  border-radius: var(--r-sm);
}

.page-about .tl-node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 1.15rem;
  color: var(--c-gray);
}

.page-about .tl-node[open] summary::after {
  content: "−";
  color: var(--c-red);
}

.page-about .tl-year {
  font-family: var(--font-num);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--c-red);
}

.page-about .tl-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-ink);
}

.page-about .tl-body {
  padding-top: 10px;
}

.page-about .tl-body p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--c-gray);
}

/* ---------- 05 编辑团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: var(--gap);
}

.page-about .team-media {
  margin: 0;
  background: var(--c-ink);
  border-radius: var(--r-xl);
  overflow: hidden;
}

.page-about .team-media img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 200px;
  object-fit: cover;
}

.page-about .team-body {
  background: var(--c-blue);
  border-radius: var(--r-xl);
  padding: clamp(20px, 2.8vw, 30px);
  color: var(--c-paper);
}

.page-about .team-list {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-list li {
  border-left: 3px solid var(--c-yellow);
  padding-left: 14px;
}

.page-about .team-k {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-num);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--c-yellow);
}

.page-about .team-list p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: rgba(255, 255, 255, 0.86);
}

.page-about .team-note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.78);
}

/* ---------- 06 标记含义 ---------- */
.page-about .mark-grid {
  display: grid;
  gap: var(--gap);
}

.page-about .mark-card {
  border-radius: var(--r-xl);
  padding: clamp(20px, 2.6vw, 28px);
  box-shadow: var(--shadow-1);
}

.page-about .mark-card--red {
  background: linear-gradient(135deg, #E11D2E 0%, #B7162A 100%);
  color: var(--c-paper);
}

.page-about .mark-card--yellow {
  background: linear-gradient(135deg, #FFC22E 0%, #F0A400 100%);
  color: var(--c-ink);
}

.page-about .mark-dot {
  display: block;
  width: 14px;
  height: 14px;
  margin-bottom: 14px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.92);
}

.page-about .mark-card--yellow .mark-dot {
  background: var(--c-ink);
}

.page-about .mark-card h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
  line-height: 1.3;
}

.page-about .mark-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
}

.page-about .mark-card--red p {
  color: rgba(255, 255, 255, 0.9);
}

.page-about .mark-card--yellow p {
  color: rgba(7, 26, 46, 0.84);
}

/* ---------- 结尾去处 ---------- */
.page-about .next-panel {
  display: grid;
  gap: 22px;
  background: var(--c-ink);
  border-radius: var(--r-xl);
  padding: clamp(22px, 3.4vw, 40px);
  color: var(--c-paper);
}

.page-about .next-panel h2 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 3vw, 2rem);
  letter-spacing: -0.02em;
}

.page-about .next-panel p {
  margin: 0;
  max-width: 36em;
  line-height: 1.78;
  color: rgba(244, 246, 249, 0.8);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .stat-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: var(--gap);
  }

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

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: end;
  }

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

  .page-about .next-panel {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }
}

@media (min-width: 980px) {
  .page-about .scope-grid {
    grid-template-columns: 1.02fr 0.98fr;
    align-items: start;
  }

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

  .page-about .lines-grid > .line-card:nth-child(2) {
    margin-top: 28px;
  }

  .page-about .lines-grid > .line-card:nth-child(3) {
    margin-top: -12px;
  }

  .page-about .history-grid {
    grid-template-columns: 0.85fr 1.15fr;
  }

  .page-about .team-grid {
    grid-template-columns: 0.8fr 1.2fr;
    align-items: stretch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .serve-card {
    transition: none;
  }

  .page-about .serve-card:hover {
    transform: none;
    box-shadow: var(--shadow-1);
  }

  .page-about .about-toc a {
    transition: none;
  }
}