/* ===== 页面作用域：.page-about ===== */
.page-about {
  --about-bright: #FFDD00;
  --about-muted: #6B6B6B;
  --about-card-tint: rgba(255, 255, 255, 0.1);
  background: var(--color-page);
}

/* ---- 面包屑 ---- */
.page-about .breadcrumbs {
  padding-top: 24px;
  font-size: 13px;
  color: var(--color-ink);
}
.page-about .breadcrumbs a {
  color: var(--color-cyan);
  text-decoration: none;
}
.page-about .breadcrumbs a:hover {
  text-decoration: underline;
}
.page-about .breadcrumbs .sep {
  margin: 0 8px;
  color: #B0A890;
}
.page-about .breadcrumbs .current {
  color: var(--color-magenta);
  font-weight: 600;
}

/* ---- Hero 标题区 ---- */
.page-about .about-hero {
  padding: 32px 0 40px;
  position: relative;
}
.page-about .hero-kicker {
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-cyan);
  font-weight: 700;
  margin-bottom: 8px;
}
.page-about .about-hero h1 {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: bold;
  line-height: 1.22;
  max-width: 760px;
  margin: 0 0 16px;
  color: var(--color-ink);
}
.page-about .hero-desc {
  font-size: 15px;
  line-height: 1.75;
  max-width: 660px;
  color: #3B3B3B;
  margin: 0 0 24px;
}
.page-about .hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .hero-links .btn {
  display: inline-block;
  padding: 10px 18px;
  font-size: 14px;
  border-radius: var(--radius);
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.page-about .hero-links .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.08);
}
.page-about .hero-links .btn-accent {
  background: var(--color-accent);
  color: var(--color-ink);
  font-weight: 700;
}
.page-about .hero-links .btn-ghost {
  background: transparent;
  border: 1.5px solid var(--color-ink);
  color: var(--color-ink);
  font-weight: 600;
}

/* 报头三色线 */
.page-about .hero-strip {
  display: flex;
  height: 5px;
  margin-top: 36px;
  width: 100%;
}
.page-about .hero-strip i {
  display: block;
  flex: 1;
}
.page-about .hero-strip .strip-cyan {
  background: var(--color-cyan);
}
.page-about .hero-strip .strip-magenta {
  background: var(--color-magenta);
}
.page-about .hero-strip .strip-yellow {
  background: var(--color-yellow);
}

/* ---- 通用 Section ---- */
.page-about .about-section {
  padding: 44px 0;
}
.page-about .about-section + .about-section {
  border-top: 0;
}
.page-about .section-heading {
  margin-bottom: 28px;
}
.page-about .section-kicker {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-cyan);
  font-weight: 700;
  margin-bottom: 6px;
}
.page-about .section-title {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: bold;
  line-height: 1.2;
  color: var(--color-ink);
  margin: 0 0 8px;
}
.page-about .section-sub {
  font-size: 14px;
  color: #555;
  line-height: 1.6;
  max-width: 640px;
}

/* 青色与洋红分区内的标题反白 */
.page-about .section-cyan .section-kicker,
.page-about .section-magenta .section-kicker {
  color: var(--color-accent);
}
.page-about .section-cyan .section-title,
.page-about .section-magenta .section-title {
  color: #fff;
}
.page-about .section-cyan .section-sub,
.page-about .section-magenta .section-sub {
  color: rgba(255, 255, 255, 0.85);
}

/* ---- 收录规模：统计卡片 ---- */
.page-about .scale-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-bottom: 36px;
}
.page-about .stat-block {
  background: var(--about-card-tint);
  border-radius: var(--radius);
  padding: 20px;
  border-left: 4px solid var(--color-accent);
}
.page-about .stat-num {
  display: block;
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: bold;
  color: var(--color-accent);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}
.page-about .stat-label {
  display: block;
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-top: 6px;
}
.page-about .stat-desc {
  display: block;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.72);
  margin-top: 4px;
  line-height: 1.5;
}

/* ---- 年份柱状图 ---- */
.page-about .year-chart {
  margin-bottom: 40px;
}
.page-about .year-chart h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  color: #fff;
  margin-bottom: 16px;
}
.page-about .year-bars {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 220px;
}
.page-about .year-bar {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  height: 100%;
}
.page-about .year-bar .bar-count {
  font-size: 9px;
  font-variant-numeric: tabular-nums;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 5px;
  white-space: nowrap;
  transition: font-weight 0.15s;
}
.page-about .year-bar .bar-track {
  flex: 1;
  width: 62%;
  min-height: 4px;
  background: rgba(255, 255, 255, 0.14);
  border-radius: 4px 4px 0 0;
  display: flex;
  align-items: flex-end;
}
.page-about .year-bar .bar-fill {
  width: 100%;
  background: var(--color-accent);
  border-radius: 4px 4px 0 0;
  transition: filter 0.2s, background 0.2s;
}
.page-about .year-bar:hover .bar-fill {
  filter: brightness(1.25);
  background: #FFF176;
}
.page-about .year-bar:hover .bar-count {
  font-weight: 700;
  color: #fff;
}
.page-about .year-bar .year-label {
  font-size: 10px;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 8px;
  font-variant-numeric: tabular-nums;
}

/* ---- 类型与地区分布 ---- */
.page-about .dist-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 32px;
}
.page-about .dist-card {
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  padding: 18px 16px;
}
.page-about .dist-card h3 {
  font-family: var(--font-serif);
  font-size: 18px;
  color: #fff;
  margin-bottom: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  padding-bottom: 8px;
}
.page-about .dist-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .dist-list li {
  display: grid;
  grid-template-columns: 52px 1fr 48px;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
}
.page-about .dist-name {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.9);
  white-space: nowrap;
}
.page-about .dist-bar {
  height: 8px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 2px;
  display: block;
  overflow: hidden;
}
.page-about .dist-fill {
  display: block;
  height: 100%;
  border-radius: 2px;
  background: var(--color-accent);
  transition: filter 0.2s;
}
.page-about .dist-region .dist-fill {
  background: #FFF3D6;
}
.page-about .dist-list li:hover .dist-fill {
  filter: brightness(1.15);
}
.page-about .dist-count {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.85);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ---- 统计信息图 ---- */
.page-about .scale-figure {
  margin: 24px 0 0;
}
.page-about .scale-figure img,
.page-about .taxo-figure img,
.page-about .update-figure img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
}
.page-about .scale-figure figcaption,
.page-about .taxo-figure figcaption,
.page-about .update-figure figcaption {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 8px;
  line-height: 1.4;
}

/* ---- 分类体系 ---- */
.page-about .about-taxonomy {
  background: var(--color-page);
}
.page-about .about-taxonomy .section-title {
  color: var(--color-ink);
}
.page-about .about-taxonomy .section-kicker {
  color: var(--color-magenta);
}
.page-about .taxonomy-levels {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin: 28px 0 24px;
}
.page-about .taxo-card {
  background: var(--color-card-cyan);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 22px 20px;
  position: relative;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.page-about .taxo-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 22px rgba(0, 0, 0, 0.08);
}
.page-about .taxo-card.taxo-episode {
  background: var(--color-card-beige);
}
.page-about .taxo-card.taxo-year {
  background: #FFF4D1;
}
.page-about .taxo-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  font-size: 11px;
  font-weight: 700;
  color: var(--color-cyan);
  background: rgba(255, 255, 255, 0.6);
  border-radius: 2px;
  padding: 2px 8px;
  letter-spacing: 0.06em;
}
.page-about .taxo-card h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: bold;
  margin: 0 0 8px;
  color: var(--color-ink);
}
.page-about .taxo-card p {
  font-size: 14px;
  line-height: 1.6;
  color: #444;
  margin: 0 0 14px;
}
.page-about .taxo-card p strong {
  color: var(--color-ink);
}
.page-about .taxo-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.page-about .taxo-tags .tag {
  padding: 4px 10px;
  font-size: 12px;
  border-radius: 999px;
}
.page-about .taxo-arrow {
  display: block;
  text-align: center;
  font-size: 28px;
  line-height: 1;
  color: var(--color-magenta);
  padding: 8px 0;
  transform: rotate(90deg);
}
.page-about .taxo-example {
  background: var(--color-card-beige);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 28px;
}
.page-about .taxo-example p {
  font-size: 14px;
  color: #3B3B3B;
  line-height: 1.6;
  margin: 0;
}
.page-about .taxo-example .badge {
  font-size: 12px;
}
.page-about .taxo-figure {
  margin: 0;
}

/* ---- 更新机制 ---- */
.page-about .about-update {
  background: var(--color-magenta);
}
.page-about .update-timeline {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}
.page-about .timeline-node {
  position: relative;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  padding: 22px 52px 20px 22px;
}
.page-about .timeline-node h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  color: #fff;
  margin: 8px 0 6px;
}
.page-about .timeline-node p {
  font-size: 14px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
}
.page-about .timeline-node p strong {
  color: var(--color-accent);
  font-size: 16px;
}
.page-about .timeline-node .badge {
  font-size: 12px;
}
.page-about .timeline-icon {
  position: absolute;
  top: 18px;
  right: 16px;
  font-size: 24px;
  color: var(--color-accent);
  opacity: 0.85;
}
.page-about .batch-panel {
  background: var(--color-ink);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 32px;
}
.page-about .batch-current {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.page-about .batch-current .batch-flag {
  background: var(--color-accent);
  color: var(--color-ink);
  font-weight: 800;
  font-size: 18px;
  padding: 6px 14px;
  border-radius: 2px;
  letter-spacing: 0.04em;
}
.page-about .batch-current .batch-label {
  color: #fff;
  font-size: 14px;
  font-weight: 600;
}
.page-about .batch-desc {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.75);
  margin: 0;
}
.page-about .batch-desc a {
  color: var(--color-accent);
  text-decoration: none;
}
.page-about .batch-desc a:hover {
  text-decoration: underline;
}

/* ---- 检索方式 ---- */
.page-about .about-methods {
  background: var(--color-card-cyan);
}
.page-about .about-methods .section-title {
  color: var(--color-ink);
}
.page-about .about-methods .section-kicker {
  color: var(--color-cyan);
}
.page-about .method-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 28px;
}
.page-about .method-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.page-about .method-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.06);
}
.page-about .method-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 2px;
  background: var(--color-yellow);
  color: var(--color-ink);
  font-size: 18px;
  font-weight: 800;
  margin-bottom: 12px;
}
.page-about .method-card.method-alpha .method-icon {
  background: var(--color-cyan);
  color: #fff;
  font-family: var(--font-serif);
}
.page-about .method-card.method-year .method-icon {
  background: var(--color-magenta);
  color: #fff;
}
.page-about .method-card.method-tag .method-icon {
  background: var(--color-ink);
  color: var(--color-accent);
}
.page-about .method-card h3 {
  font-family: var(--font-serif);
  font-size: 19px;
  margin: 0 0 8px;
  color: var(--color-ink);
}
.page-about .method-card p {
  font-size: 14px;
  line-height: 1.6;
  color: #444;
  margin: 0;
}
.page-about .method-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .method-cta .btn {
  padding: 10px 18px;
  font-size: 14px;
  border-radius: var(--radius);
  text-decoration: none;
  transition: transform 0.15s, box-shadow 0.15s;
}
.page-about .method-cta .btn:hover {
  transform: translateY(-2px);
}
.page-about .method-cta .btn-accent {
  background: var(--color-accent);
  color: var(--color-ink);
  font-weight: 700;
}
.page-about .method-cta .btn-ghost {
  background: #fff;
  border: 1.5px solid var(--color-ink);
  color: var(--color-ink);
  font-weight: 600;
}

/* ---- 版本信息 ---- */
.page-about .about-version {
  background: var(--color-ink);
}
.page-about .about-version .section-title {
  color: #fff;
}
.page-about .about-version .section-kicker {
  color: var(--color-accent);
}
.page-about .about-version .section-sub {
  color: rgba(255, 255, 255, 0.7);
}
.page-about .version-wrap {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 24px;
}
.page-about .version-badge-large {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--color-accent);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-ink);
  box-shadow: 0 0 0 4px var(--color-ink), 0 0 0 7px var(--color-accent);
  flex-shrink: 0;
}
.page-about .version-badge-large span {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
}
.page-about .version-badge-large strong {
  font-family: var(--font-serif);
  font-size: 36px;
  line-height: 1;
}
.page-about .version-desc {
  max-width: 640px;
}
.page-about .version-desc p {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
  margin: 0 0 12px;
}
.page-about .version-desc strong {
  color: var(--color-accent);
}
.page-about .device-support {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 28px;
}
.page-about .device-support .badge {
  font-size: 13px;
  padding: 7px 14px;
  border-radius: 999px;
}

/* ---- 版本 meta 表格 ---- */
.page-about .version-meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: #333;
  border: 1px solid #333;
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 24px;
}
.page-about .meta-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: #242424;
  padding: 14px 16px;
}
.page-about .meta-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.55);
}
.page-about .meta-value {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  line-height: 1.4;
}
.page-about .version-extra {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
}
.page-about .version-extra a {
  color: var(--color-accent);
  text-decoration: none;
}
.page-about .version-extra a:hover {
  text-decoration: underline;
}

/* ---- 桌面端 ---- */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 48px 0 52px;
  }
  .page-about .about-hero h1 {
    font-size: 40px;
  }
  .page-about .hero-desc {
    font-size: 16px;
  }
  .page-about .hero-strip {
    height: 6px;
    margin-top: 44px;
  }

  .page-about .about-section {
    padding: 56px 0;
  }

  .page-about .scale-stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
  .page-about .year-bars {
    gap: 10px;
    height: 260px;
  }
  .page-about .year-bar .bar-count {
    font-size: 11px;
  }
  .page-about .year-bar .year-label {
    font-size: 12px;
  }

  .page-about .dist-grid {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
  .page-about .dist-card {
    padding: 22px;
  }

  .page-about .taxonomy-levels {
    flex-direction: row;
    align-items: center;
    gap: 12px;
  }
  .page-about .taxo-card {
    flex: 1;
    padding: 26px 24px;
  }
  .page-about .taxo-arrow {
    transform: none;
    padding: 0 2px;
    font-size: 32px;
  }

  .page-about .update-timeline {
    flex-direction: row;
    gap: 16px;
  }
  .page-about .timeline-node {
    flex: 1;
    min-height: 180px;
  }

  .page-about .batch-panel {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 24px 28px;
  }
  .page-about .batch-desc {
    max-width: 520px;
    text-align: right;
  }

  .page-about .method-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .page-about .version-wrap {
    flex-direction: row;
    align-items: center;
    gap: 32px;
  }
  .page-about .version-meta {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .method-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .version-meta {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .scale-figure {
    max-width: 880px;
    margin-left: auto;
    margin-right: auto;
  }
  .page-about .taxo-figure {
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
  }
  .page-about .update-figure {
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
  }
}

/* ---- 减少动效 ---- */
@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    transform: none !important;
  }
}