.page-about {
  background: var(--bg-ink);
  color: var(--text-cream);
  font-family: var(--font-body);
  scroll-behavior: smooth;
}

.page-about .about-layout {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding-top: 32px;
  padding-bottom: 72px;
}

/* 档案目录 */
.page-about .about-toc {
  padding: 18px 14px 14px;
  background: rgba(21, 16, 16, 0.92);
  border: 1px solid var(--border-metal);
  border-left: 4px solid var(--gold-brand);
  box-shadow: 0 18px 40px var(--shadow-black);
}
.page-about .about-toc-label {
  display: block;
  padding: 0 6px 10px;
  color: var(--gold-bright);
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border-metal);
}
.page-about .about-toc-nav {
  display: flex;
  flex-wrap: nowrap;
  gap: 6px;
  overflow-x: auto;
  padding: 12px 0;
}
.page-about .about-toc-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  color: var(--text-muted);
  font-size: 14px;
  text-decoration: none;
  white-space: nowrap;
  border-left: 2px solid transparent;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease), background 0.22s var(--ease);
}
.page-about .about-toc-num {
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--gold-brand);
}
.page-about .about-toc-link:hover {
  color: var(--gold-bright);
  border-left-color: var(--gold-brand);
  background: rgba(201, 162, 39, 0.08);
}
.page-about .about-toc-callout {
  margin-top: 12px;
  padding: 12px 10px 6px;
  background: rgba(122, 20, 36, 0.18);
  border-top: 1px solid var(--border-metal);
}
.page-about .about-toc-callout-title {
  margin: 0 0 4px;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-cream);
}
.page-about .about-toc-callout-text {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-muted);
}
.page-about .about-toc-callout a {
  color: var(--gold-bright);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 主内容画布 */
.page-about .about-canvas {
  min-width: 0;
  flex: 1;
}

/* Hero */
.page-about .about-hero {
  position: relative;
  padding: 32px 0 40px;
  border-bottom: 2px solid var(--border-metal);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -2px;
  width: 28%;
  height: 4px;
  background: var(--gold-brand);
}
.page-about .about-hero .breadcrumbs {
  margin-bottom: 24px;
  font-size: 13px;
  color: var(--text-muted);
}
.page-about .about-hero .breadcrumbs a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.page-about .about-hero .breadcrumbs a:hover {
  color: var(--gold-bright);
}
.page-about .about-hero .page-id {
  display: inline-block;
  margin-bottom: 14px;
  padding: 4px 10px;
  background: var(--crimson-deep);
  color: var(--text-cream);
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: 0.08em;
  transform: skewX(-6deg);
}
.page-about .about-hero .page-title {
  margin: 0 0 16px;
  max-width: 760px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--text-cream);
  text-shadow: 0 0 28px rgba(242, 201, 76, 0.08);
}
.page-about .about-hero .page-description {
  max-width: 720px;
  margin: 0 0 24px;
  color: var(--text-muted);
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.85;
}
.page-about .about-hero .hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.page-about .about-hero .hero-tags .tag {
  text-decoration: none;
  transform: skewX(-6deg);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.page-about .about-hero .hero-tags .tag:hover {
  transform: skewX(-6deg) translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

/* 章节通用 */
.page-about .about-section {
  scroll-margin-top: calc(var(--header-h) + 24px);
  padding: 48px 0 8px;
}
.page-about .section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--border-metal);
  padding-bottom: 12px;
}
.page-about .section-head .archive-index {
  font-family: var(--font-num);
  font-size: 15px;
  color: var(--gold-brand);
  letter-spacing: 0.1em;
}
.page-about .section-head .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--text-cream);
}
.page-about .lead {
  font-size: 19px;
  line-height: 1.8;
  color: var(--text-cream);
  font-weight: 500;
}

/* 品牌是谁 */
.page-about .about-who {
  padding-top: 52px;
}
.page-about .about-who-body p {
  margin: 0 0 18px;
  color: var(--text-muted);
  line-height: 1.85;
  max-width: 780px;
}
.page-about .about-who-body .lead {
  color: var(--text-cream);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.75;
}
.page-about .about-who-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}
.page-about .about-who-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  color: #0B090A;
  background: var(--gold-brand);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid var(--gold-brand);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), transform 0.2s var(--ease);
}
.page-about .about-who-link:hover {
  background: var(--gold-bright);
  color: #0B090A;
  transform: translateY(-2px);
}
.page-about .about-who-link::after {
  content: "\2192";
  font-family: var(--font-num);
  font-size: 15px;
}

/* 发展里程碑 */
.page-about .about-milestone-figure {
  margin: 0 0 36px;
  overflow: hidden;
  border: 1px solid var(--border-metal);
  box-shadow: 0 20px 44px var(--shadow-black);
}
.page-about .about-milestone-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}
.page-about .about-timeline {
  position: relative;
  padding-left: 30px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--gold-bright) 0%, var(--gold-brand) 62%, var(--crimson-deep) 100%);
  transform: skewX(-6deg);
  transform-origin: top;
}
.page-about .timeline-item {
  position: relative;
  margin-bottom: 28px;
}
.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 22px;
  width: 13px;
  height: 13px;
  background: var(--gold-brand);
  border: 2px solid var(--bg-ink);
  transform: rotate(45deg);
  box-shadow: 0 0 16px rgba(242, 201, 76, 0.5);
  z-index: 1;
}
.page-about .timeline-card {
  padding: 20px 20px 14px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-metal);
  border-left: 6px solid var(--gold-brand);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  transition: transform 0.26s var(--ease), box-shadow 0.26s var(--ease), border-color 0.26s var(--ease);
}
.page-about .timeline-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.55), 0 0 24px rgba(201, 162, 39, 0.12);
  border-color: var(--gold-bright);
}
.page-about .timeline-year {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 12px;
  background: var(--gold-brand);
  color: #0B090A;
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: 0.06em;
  transform: skewX(-6deg);
}
.page-about .timeline-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.35;
  color: var(--text-cream);
}
.page-about .timeline-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.8;
}

/* 内容与编辑原则 */
.page-about .about-editorial {
  padding-top: 52px;
}
.page-about .about-editorial-lead {
  max-width: 780px;
  margin: 0 0 28px;
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.85;
}
.page-about .about-tabs {
  background: var(--bg-elevated);
  border: 1px solid var(--border-metal);
  box-shadow: inset 0 0 50px rgba(201, 162, 39, 0.05);
}
.page-about .about-tabs .tab-list {
  display: flex;
  flex-wrap: nowrap;
  gap: 2px;
  overflow-x: auto;
  border-bottom: 2px solid var(--border-metal);
  background: rgba(11, 9, 10, 0.4);
}
.page-about .about-tabs .tab-button {
  flex: 0 0 auto;
  padding: 14px 20px;
  margin: 0;
  background: transparent;
  border: 0;
  border-bottom: 3px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease), background 0.22s var(--ease);
}
.page-about .about-tabs .tab-button:hover {
  color: var(--gold-bright);
  background: rgba(201, 162, 39, 0.07);
}
.page-about .about-tabs .tab-button[aria-selected="true"] {
  color: var(--gold-bright);
  border-bottom-color: var(--gold-brand);
  background: rgba(201, 162, 39, 0.1);
}
.page-about .about-tabs .tab-panel {
  padding: 24px 20px;
}
.page-about .about-tabs .tab-panel p {
  margin: 0 0 14px;
  color: var(--text-muted);
  font-size: 15px;
  line-height: 1.85;
  max-width: 780px;
}
.page-about .about-tab-link {
  display: inline-block;
  margin-top: 6px;
  padding: 8px 16px;
  color: var(--gold-bright);
  background: rgba(201, 162, 39, 0.08);
  border: 1px solid rgba(201, 162, 39, 0.4);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: background 0.22s var(--ease), border-color 0.22s var(--ease);
}
.page-about .about-tab-link:hover {
  background: rgba(201, 162, 39, 0.18);
  border-color: var(--gold-bright);
}

/* 数据规模 */
.page-about .about-scale {
  padding-top: 52px;
}
.page-about .about-scale-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: center;
}
.page-about .about-scale-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--border-metal);
  box-shadow: 0 14px 36px var(--shadow-black);
}
.page-about .about-scale-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--border-metal);
  border: 1px solid var(--border-metal);
  box-shadow: 0 14px 34px var(--shadow-black);
}
.page-about .stat-item {
  padding: 26px 16px 22px;
  background: var(--bg-elevated);
  text-align: center;
  transition: background 0.22s var(--ease);
}
.page-about .stat-item:hover {
  background: #1E1616;
}
.page-about .stat-num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(32px, 7vw, 52px);
  font-weight: 600;
  line-height: 1;
  color: var(--gold-brand);
  text-shadow: 0 0 24px rgba(201, 162, 39, 0.22);
}
.page-about .stat-label {
  display: block;
  margin-top: 10px;
  color: var(--text-muted);
  font-size: 14px;
  letter-spacing: 0.04em;
}
.page-about .about-scale-note {
  margin: 22px 0 0;
  padding: 14px 18px;
  background: rgba(122, 20, 36, 0.16);
  border-left: 4px solid var(--crimson-deep);
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.8;
}

/* 合作生态 */
.page-about .about-ecosystem {
  padding-top: 52px;
}
.page-about .about-ecosystem-lead {
  max-width: 780px;
  margin: 0 0 28px;
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.85;
}
.page-about .tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 28px 22px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-metal);
  box-shadow: inset 0 0 60px rgba(201, 162, 39, 0.06), 0 12px 32px rgba(0, 0, 0, 0.4);
}
.page-about .cloud-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid var(--border-metal);
  color: var(--text-cream);
  background: transparent;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: background 0.22s var(--ease), border-color 0.22s var(--ease), transform 0.22s var(--ease), color 0.22s var(--ease);
}
.page-about .cloud-tag::before {
  content: "/";
  color: var(--gold-brand);
  font-family: var(--font-num);
  font-weight: 600;
  font-size: 16px;
}
.page-about .cloud-tag:hover {
  background: var(--crimson-deep);
  border-color: var(--crimson-live);
  color: var(--text-cream);
  transform: translateY(-2px);
}
.page-about .about-ecosystem-note {
  margin: 22px 0 0;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.8;
}
.page-about .about-ecosystem-note a {
  color: var(--gold-bright);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 合规声明 */
.page-about .about-compliance {
  padding-top: 52px;
}
.page-about .about-compliance-figure {
  margin: 0 0 28px;
  overflow: hidden;
  border: 1px solid var(--border-metal);
  box-shadow: 0 12px 32px var(--shadow-black);
}
.page-about .about-compliance-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  opacity: 0.92;
}
.page-about .about-compliance-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
.page-about .about-compliance-card {
  padding: 22px 20px 18px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-metal);
  border-top: 3px solid var(--gold-brand);
  transition: transform 0.22s var(--ease), box-shadow 0.22s var(--ease);
}
.page-about .about-compliance-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.5);
}
.page-about .about-compliance-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 17px;
  color: var(--text-cream);
}
.page-about .about-compliance-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.8;
}
.page-about .about-compliance-note {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid var(--border-metal);
}
.page-about .about-compliance-note a {
  color: var(--text-muted);
  font-size: 14px;
  text-decoration: none;
  padding: 8px 14px;
  border: 1px solid transparent;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease);
}
.page-about .about-compliance-note a:hover {
  color: var(--gold-bright);
  border-color: var(--border-metal);
}

/* 桌面布局增强 */
@media (min-width: 900px) {
  .page-about .about-layout {
    flex-direction: row;
    gap: 40px;
    padding-top: 44px;
    padding-bottom: 88px;
  }
  .page-about .about-toc {
    flex: 0 0 240px;
    align-self: flex-start;
    position: sticky;
    top: calc(var(--header-h) + 24px);
    overflow: visible;
    padding: 22px 16px 16px;
  }
  .page-about .about-toc-nav {
    flex-direction: column;
    overflow: visible;
    gap: 4px;
  }
  .page-about .about-toc-link {
    white-space: normal;
    width: 100%;
    padding: 10px 12px;
  }
  .page-about .about-toc-callout {
    margin-top: 20px;
  }
  .page-about .about-hero {
    padding: 44px 0 48px;
  }
  .page-about .about-hero .page-title {
    font-size: clamp(40px, 5vw, 58px);
  }
  .page-about .about-section {
    padding: 56px 0 16px;
  }
  .page-about .about-scale-layout {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 32px;
  }
  .page-about .about-compliance-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 22px;
  }
  .page-about .timeline-card {
    padding: 24px 26px 18px;
  }
  .page-about .about-tabs .tab-panel {
    padding: 30px 28px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-layout {
    gap: 56px;
  }
  .page-about .about-toc {
    flex-basis: 268px;
  }
  .page-about .about-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .stat-item {
    padding: 34px 20px 26px;
  }
}