.page-about {
  background: var(--color-bg-primary);
  font-family: var(--font-body);
  color: var(--color-text);
  overflow-x: hidden;
}
.page-about .about-inner {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.2rem;
}
.page-about .about-hero {
  padding: 1.6rem 0 2.2rem;
}
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-size: var(--size-caption);
  color: var(--color-muted);
  margin-bottom: 1rem;
}
.page-about .breadcrumb a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--ease);
}
.page-about .breadcrumb a:hover {
  color: var(--color-dark);
}
.page-about h1 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4.6vw, 3rem);
  font-weight: 900;
  line-height: 1.18;
  margin: 0 0 0.8rem;
  color: var(--color-dark);
  letter-spacing: 0.02em;
}
.page-about .about-intro {
  color: var(--color-text);
  font-size: var(--size-body);
  line-height: 1.8;
  max-width: 48rem;
  margin: 0 0 1.4rem;
}
.page-about .about-hero__img {
  width: 100%;
  max-width: 1180px;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 2px solid var(--color-border);
  display: block;
}
.page-about .stat-band {
  padding: 2.4rem 0 3rem;
}
.page-about .about-section__head {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1.4rem;
}
.page-about .about-section__index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.8rem;
  height: 2.8rem;
  border-radius: var(--radius-pill);
  background: var(--color-dark);
  color: var(--color-panel);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  flex: 0 0 auto;
}
.page-about .about-section__head h2 {
  font-family: var(--font-display);
  font-size: var(--size-h2);
  font-weight: 800;
  margin: 0;
  color: var(--color-dark);
  letter-spacing: 0.03em;
}
.page-about .about-section__line {
  flex: 1;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--color-border) 0 8px, transparent 8px 16px);
  opacity: 0.5;
}
.page-about .stat-band__grid {
  display: grid;
  gap: 1.2rem;
}
.page-about .stat-band__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 0.9rem;
}
.page-about .stat-tile {
  position: relative;
  min-height: 150px;
  padding: 1.1rem 1.1rem 2.4rem;
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  box-shadow: var(--shadow-sm);
  border: 2px solid transparent;
  transition: border-color var(--ease), transform var(--ease), box-shadow var(--ease);
  overflow: hidden;
}
.page-about .stat-tile:hover,
.page-about .stat-tile:focus-visible {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.page-about .stat-tile--total {
  background: var(--color-dark);
  color: var(--color-panel);
}
.page-about .stat-tile--total p {
  color: rgba(253, 248, 242, 0.82);
}
.page-about .stat-tile--category {
  background: var(--color-card-primary);
}
.page-about .stat-tile--column {
  background: var(--color-card-secondary);
}
.page-about .stat-tile--tag {
  background: var(--color-card-accent);
}
.page-about .stat-num {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 900;
  line-height: 1;
}
.page-about .stat-unit {
  font-size: var(--size-body);
  font-weight: 600;
}
.page-about .stat-tile p {
  font-size: var(--size-caption);
  line-height: 1.6;
  margin: 0.2rem 0 0;
  max-width: 12rem;
}
.page-about .stat-tile::after {
  content: "进入目录 →";
  position: absolute;
  right: 0.8rem;
  bottom: 0.8rem;
  background: var(--color-panel);
  color: var(--color-dark);
  font-size: var(--size-caption);
  padding: 0.28rem 0.7rem;
  border-radius: var(--radius-pill);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity var(--ease), transform var(--ease);
}
.page-about .stat-tile:hover::after,
.page-about .stat-tile:focus-visible::after {
  opacity: 1;
  transform: none;
}
.page-about .scope-examples {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.1rem;
  display: grid;
  align-content: start;
  gap: 0.7rem;
}
.page-about .scope-examples h3 {
  font-size: var(--size-h3);
  font-family: var(--font-display);
  margin: 0 0 0.2rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px dotted var(--color-border);
}
.page-about .scope-item {
  display: grid;
  grid-template-columns: 2.4rem 1fr auto;
  align-items: center;
  gap: 0.7rem;
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.7rem 0.8rem;
  text-decoration: none;
  color: var(--color-text);
  transition: border-color var(--ease), box-shadow var(--ease);
}
.page-about .scope-item:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}
.page-about .scope-item__index {
  width: 2.2rem;
  height: 2.2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  background: var(--color-dark);
  color: var(--color-panel);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}
.page-about .scope-item__text {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  min-width: 0;
}
.page-about .scope-item__text strong {
  font-weight: 700;
  font-size: 0.95rem;
}
.page-about .scope-item__text small {
  color: var(--color-muted);
  font-size: 0.78rem;
}
.page-about .status-badge {
  display: inline-block;
  flex: 0 0 auto;
  padding: 0.22rem 0.55rem;
  border-radius: var(--radius-pill);
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
}
.page-about .status-badge--new {
  background: var(--color-new-bg);
  color: var(--color-new);
}
.page-about .status-badge--update {
  background: var(--color-update-bg);
  color: #9A6B00;
}
.page-about .status-badge--hot {
  background: #FFE9D5;
  color: var(--color-accent);
}
.page-about .status-badge--archived {
  background: var(--color-archived-bg);
  color: var(--color-archived);
}
.page-about .tree-section {
  background: var(--color-bg-secondary);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
  padding: 2.4rem 0 3rem;
}
.page-about .tree-grid {
  display: grid;
  gap: 1.5rem;
}
.page-about .tree-art {
  display: grid;
  align-content: start;
  gap: 1rem;
}
.page-about .tree-art img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
}
.page-about .tree-art__note {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  background: var(--color-panel);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  padding: 0.8rem 1rem;
}
.page-about .tree-art__num {
  font-family: var(--font-display);
  font-size: 2.6rem;
  font-weight: 900;
  color: var(--color-card-primary);
  line-height: 1;
}
.page-about .tree-art__note p {
  margin: 0;
  font-size: var(--size-caption);
  line-height: 1.5;
  color: var(--color-text);
}
.page-about .tree-chart {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.2rem;
  box-shadow: var(--shadow-sm);
}
.page-about .tree-root {
  margin-bottom: 1rem;
}
.page-about .tree-root a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-dark);
  color: var(--color-panel);
  text-decoration: none;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
}
.page-about .tree-root small {
  background: var(--color-panel);
  color: var(--color-dark);
  border-radius: var(--radius-pill);
  padding: 0.2rem 0.7rem;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
}
.page-about .tree-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  position: relative;
}
.page-about .tree-list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: var(--color-border);
  opacity: 0.45;
}
.page-about .tree-branch {
  position: relative;
  padding-left: 1.5rem;
}
.page-about .tree-branch::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.1rem;
  width: 1.2rem;
  height: 2px;
  background: var(--color-border);
  opacity: 0.45;
}
.page-about .branch-head a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-card-primary);
  color: var(--color-panel);
  text-decoration: none;
  padding: 0.62rem 0.8rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  transition: background var(--ease), transform var(--ease);
}
.page-about .tree-branch:nth-child(2) .branch-head a {
  background: var(--color-card-secondary);
}
.page-about .tree-branch:nth-child(3) .branch-head a {
  background: var(--color-card-accent);
  color: var(--color-dark);
}
.page-about .tree-branch:nth-child(4) .branch-head a {
  background: var(--color-card-primary);
}
.page-about .tree-branch:nth-child(5) .branch-head a {
  background: var(--color-card-secondary);
}
.page-about .tree-branch:nth-child(6) .branch-head a {
  background: var(--color-card-accent);
  color: var(--color-dark);
}
.page-about .branch-head a:hover {
  transform: translateX(4px);
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}
.page-about .branch-head b {
  background: rgba(253, 248, 242, 0.92);
  color: var(--color-dark);
  border-radius: var(--radius-pill);
  padding: 0.15rem 0.6rem;
  font-size: 0.78rem;
  flex: 0 0 auto;
}
.page-about .branch-subs {
  list-style: none;
  margin: 0.45rem 0 0;
  padding: 0 0 0 0.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.page-about .branch-subs li {
  font-size: 0.82rem;
  background: rgba(176, 141, 106, 0.18);
  border: 1px solid rgba(176, 141, 106, 0.5);
  border-radius: var(--radius-pill);
  padding: 0.25rem 0.65rem;
  color: var(--color-dark);
}
.page-about .branch-tags {
  margin: 0.4rem 0 0 0.5rem;
  font-size: 0.78rem;
  color: var(--color-muted);
  line-height: 1.5;
}
.page-about .tree-tagline {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-top: 1rem;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.9rem 1rem;
}
.page-about .tree-tagline__num {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--color-card-secondary);
  flex: 0 0 auto;
}
.page-about .tree-tagline p {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--color-text);
}
.page-about .batch-section {
  padding: 2.4rem 0 3rem;
}
.page-about .batch-steps {
  display: grid;
  gap: 1rem;
}
.page-about .batch-step {
  position: relative;
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-top: 5px solid var(--color-card-primary);
  border-radius: var(--radius-md);
  padding: 1.1rem 1rem 1.2rem;
  box-shadow: var(--shadow-sm);
  transition: transform var(--ease), box-shadow var(--ease);
}
.page-about .batch-step:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.page-about .batch-step--green {
  border-top-color: var(--color-card-secondary);
}
.page-about .batch-step--amber {
  border-top-color: var(--color-update);
}
.page-about .batch-step--orange {
  border-top-color: var(--color-accent);
}
.page-about .batch-step__num {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-muted);
  display: block;
  margin-bottom: 0.4rem;
}
.page-about .batch-step h3 {
  font-size: 1.08rem;
  margin: 0 0 0.35rem;
  color: var(--color-dark);
  font-family: var(--font-display);
  font-weight: 800;
}
.page-about .batch-step p {
  font-size: 0.86rem;
  line-height: 1.7;
  margin: 0;
  color: var(--color-text);
}
.page-about .version-section {
  padding: 2.8rem 0 3.4rem;
}
.page-about .version-section .about-section__head h2 {
  color: var(--color-panel);
}
.page-about .version-section .about-section__index {
  background: var(--color-accent);
  color: var(--color-dark);
}
.page-about .version-section .about-section__line {
  background: repeating-linear-gradient(90deg, rgba(253, 248, 242, 0.5) 0 8px, transparent 8px 16px);
  opacity: 0.4;
}
.page-about .version-grid {
  display: grid;
  gap: 1.4rem;
  background: var(--color-dark);
  border-radius: var(--radius-lg);
  padding: 1.2rem;
}
.page-about .version-visual {
  display: grid;
  align-content: start;
  gap: 0.7rem;
}
.page-about .version-visual img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 2px solid rgba(253, 248, 242, 0.2);
}
.page-about .version-visual__caption {
  margin: 0;
  font-size: 0.78rem;
  color: rgba(253, 248, 242, 0.75);
  line-height: 1.5;
}
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0.2rem 0 0 0.8rem;
  border-left: 2px solid var(--color-border);
}
.page-about .timeline-item {
  position: relative;
  padding: 0 0 1.6rem 1.4rem;
}
.page-about .timeline-item:last-child {
  padding-bottom: 0.2rem;
}
.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -1.45rem;
  top: 0.5rem;
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 50%;
  background: var(--color-update);
  border: 3px solid var(--color-dark);
  box-shadow: 0 0 0 1px var(--color-update);
}
.page-about .timeline-item--v1::before {
  background: var(--color-archived);
  box-shadow: 0 0 0 1px var(--color-archived);
}
.page-about .timeline-item--v2::before {
  background: var(--color-new);
  box-shadow: 0 0 0 1px var(--color-new);
}
.page-about .timeline-item--v3::before {
  background: var(--color-update);
  box-shadow: 0 0 0 1px var(--color-update);
}
.page-about .timeline-item--v32::before {
  background: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-accent);
}
.page-about .version-badge {
  display: inline-block;
  color: var(--color-dark);
  background: var(--color-update);
  border-radius: var(--radius-pill);
  padding: 0.2rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
}
.page-about .timeline-item--v1 .version-badge {
  background: var(--color-archived-bg);
  color: var(--color-archived);
}
.page-about .timeline-item--v2 .version-badge {
  background: var(--color-new-bg);
  color: var(--color-new);
}
.page-about .timeline-item--v32 .version-badge {
  background: var(--color-accent);
  color: var(--color-dark);
}
.page-about .timeline-item h3 {
  margin: 0.4rem 0 0.3rem;
  font-size: 1.1rem;
  color: var(--color-panel);
  font-family: var(--font-display);
  font-weight: 800;
}
.page-about .timeline-item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: rgba(253, 248, 242, 0.85);
}
.page-about .entrance-section {
  padding: 2.6rem 0 3.2rem;
}
.page-about .entrance-grid {
  display: grid;
  gap: 1rem;
}
.page-about .entrance-card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  background: var(--color-card-accent);
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  padding: 1.2rem;
  text-decoration: none;
  color: var(--color-dark);
  transition: border-color var(--ease), transform var(--ease), box-shadow var(--ease);
}
.page-about .entrance-card:hover {
  border-color: var(--color-dark);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.page-about .entrance-card:nth-child(2) {
  background: var(--color-panel);
  border-color: var(--color-border);
}
.page-about .entrance-card:nth-child(3) {
  background: var(--color-card-primary);
  color: var(--color-panel);
}
.page-about .entrance-card:nth-child(3) .entrance-card__num {
  background: var(--color-panel);
  color: var(--color-dark);
}
.page-about .entrance-card__num {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: var(--radius-pill);
  background: var(--color-dark);
  color: var(--color-panel);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  margin-bottom: 0.4rem;
}
.page-about .entrance-card strong {
  font-size: 1.2rem;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.4;
}
.page-about .entrance-card span:last-child {
  font-size: 0.88rem;
  line-height: 1.6;
  opacity: 0.88;
}
@media (min-width: 640px) {
  .page-about .entrance-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (min-width: 820px) {
  .page-about .stat-band__grid {
    grid-template-columns: minmax(280px, 0.95fr) 1.05fr;
    align-items: stretch;
  }
  .page-about .scope-examples h3 {
    font-size: 1.1rem;
  }
  .page-about .batch-steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .version-grid {
    grid-template-columns: 320px 1fr;
  }
  .page-about .version-visual img {
    height: 100%;
    max-height: 360px;
  }
}
@media (min-width: 980px) {
  .page-about .tree-grid {
    grid-template-columns: 280px 1fr;
    align-items: start;
  }
  .page-about .tree-art {
    position: sticky;
    top: 1.5rem;
  }
  .page-about .batch-steps {
    grid-template-columns: repeat(4, 1fr);
  }
}
@media (min-width: 1120px) {
  .page-about .stat-band__grid {
    grid-template-columns: minmax(340px, 1.1fr) minmax(360px, 0.9fr);
  }
  .page-about .about-inner {
    padding: 0 0.5rem;
  }
}