.page-about {
  --about-line: rgba(142, 91, 158, 0.42);
  --about-panel: #241E2E;
  --about-mark: #39FF14;
  background: var(--c-page);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.6;
}

.page-about .about-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px;
}

.page-about .about-section {
  padding: 34px 0 38px;
}

.page-about [hidden] {
  display: none !important;
}

.page-about .breadcrumbs {
  padding: 18px 0 0;
  font-size: 12px;
  color: var(--c-muted);
}

.page-about .breadcrumbs a {
  color: var(--c-primary);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  color: var(--c-accent);
}

.page-about .breadcrumbs__sep {
  margin: 0 6px;
  color: var(--c-border);
}

.page-about .about-hero {
  padding: 18px 0 28px;
  border-bottom: 1px solid var(--c-border);
}

.page-about .about-hero h1 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.02em;
}

.page-about .about-hero__lead {
  margin: 0 0 16px;
  max-width: 860px;
  color: var(--c-muted);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-index a {
  display: inline-block;
  padding: 5px 12px 4px;
  border: 1px solid var(--c-border);
  background: rgba(36, 30, 46, 0.55);
  color: var(--c-text);
  font-family: var(--font-mono);
  font-size: 12px;
  text-decoration: none;
}

.page-about .about-index a:hover {
  border-color: var(--c-primary);
  color: var(--c-primary);
}

.page-about .section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  margin-bottom: 18px;
}

.page-about .section-head__mark {
  padding: 2px 7px;
  border: 1px solid var(--c-border);
  color: var(--c-accent);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1;
}

.page-about .section-title {
  margin: 0;
}

.page-about .section-head__hint {
  margin-left: auto;
  color: var(--c-muted);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .overview-visual {
  margin: 0 0 20px;
}

.page-about .overview-visual__img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--c-border);
  background: var(--c-card);
}

.page-about .stat-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .stat-card {
  position: relative;
  padding: 16px 16px 14px;
  border: 1px solid var(--c-border);
  background: var(--c-card);
  border-top: 4px solid var(--stat-accent, var(--c-accent));
}

.page-about .stat-card--total {
  --stat-accent: var(--c-accent);
}

.page-about .stat-card--axis {
  --stat-accent: var(--c-primary);
}

.page-about .stat-card--batch {
  --stat-accent: var(--c-new);
}

.page-about .stat-card--ver {
  --stat-accent: var(--c-tag-hot);
}

.page-about .stat-card__label {
  display: block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-muted);
  margin-bottom: 6px;
}

.page-about .stat-card__num {
  display: block;
  font-family: var(--font-head);
  font-size: 34px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--stat-accent, var(--c-text));
}

.page-about .stat-card__num small {
  font-size: 14px;
  font-weight: 400;
  margin-left: 4px;
  color: var(--c-text);
}

.page-about .stat-card__meta {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  color: var(--c-muted);
  line-height: 1.5;
}

.page-about .about-section--category {
  background: var(--c-section-a);
}

.page-about .category-layout {
  display: grid;
  gap: 20px;
}

.page-about .tree-rank__root {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 1px solid var(--c-border);
  background: var(--c-card);
  padding: 12px 16px;
}

.page-about .tree-rank__root-name {
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
}

.page-about .tree-rank__root-count {
  font-family: var(--font-mono);
  font-size: 22px;
  color: var(--c-accent);
}

.page-about .tree-rank__grid {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.page-about .tree-branch {
  border: 1px solid var(--c-border);
  background: rgba(36, 30, 46, 0.72);
}

.page-about .tree-branch__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-bottom: 1px solid var(--c-border);
  background: rgba(28, 10, 41, 0.5);
}

.page-about .tree-branch__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
}

.page-about .tree-branch__title::before {
  content: "";
  width: 9px;
  height: 9px;
  background: var(--branch);
  display: inline-block;
}

.page-about .tree-branch--publisher {
  --branch: var(--c-tag-hot);
}

.page-about .tree-branch--era {
  --branch: var(--c-primary);
}

.page-about .tree-branch--region {
  --branch: var(--c-tag-mid);
}

.page-about .tree-branch--taste {
  --branch: var(--c-accent);
}

.page-about .tree-branch__meta {
  font-size: 12px;
  color: var(--c-muted);
}

.page-about .tree-branch__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .tree-leaf {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 12px;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .tree-leaf:last-of-type {
  border-bottom: 0;
}

.page-about .tree-leaf:hover {
  background: rgba(36, 30, 46, 0.55);
}

.page-about .tree-leaf__name {
  font-size: 14px;
}

.page-about .tree-leaf__count {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 2px 8px 1px;
  border: 1px solid var(--c-border);
  background: var(--c-card);
}

.page-about .category-note {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--c-border);
  background: rgba(28, 10, 41, 0.42);
}

.page-about .category-note img {
  width: 100%;
  max-width: 200px;
  height: auto;
  border: 1px solid var(--c-border);
}

.page-about .category-note p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: #E6D9EF;
}

.page-about .route-flow {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .route-step {
  position: relative;
  padding: 14px 16px 14px 92px;
  border: 1px solid var(--c-border);
  background: var(--c-card);
  border-left: 4px solid var(--c-primary);
}

.page-about .route-step__num {
  position: absolute;
  top: 16px;
  left: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-accent);
  letter-spacing: 0.06em;
}

.page-about .route-step__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
}

.page-about .route-step p {
  margin: 0;
  font-size: 14px;
  color: var(--c-muted);
  line-height: 1.6;
}

.page-about .route-arrow {
  align-self: center;
  color: var(--c-primary);
  font-size: 20px;
  line-height: 1;
  transform: rotate(90deg);
  display: block;
}

.page-about .about-section--version {
  background: var(--c-section-b);
}

.page-about .version-wrap {
  border: 1px solid var(--c-border);
  background: #1C0A29;
}

.page-about .version-table {
  table-layout: fixed;
}

.page-about .version-table caption {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.page-about .version-table th,
.page-about .version-table td {
  padding: 12px 14px;
  font-size: 14px;
}

.page-about .version-table th {
  width: 28%;
  color: var(--c-muted);
  font-weight: 400;
  vertical-align: top;
}

.page-about .version-table td {
  color: var(--c-text);
}

.page-about .version-more {
  display: flex;
  justify-content: flex-end;
  padding: 14px;
  border-top: 1px solid var(--c-border);
}

.page-about .version-more .btn {
  text-decoration: none;
}

.page-about .device-compare {
  display: grid;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .device-panel {
  padding: 18px 18px 16px;
  border: 1px solid var(--c-border);
  background: var(--c-card);
  border-top: 4px solid var(--device-accent, var(--c-primary));
}

.page-about .device-panel--desktop {
  --device-accent: var(--c-primary);
}

.page-about .device-panel--mobile {
  --device-accent: var(--c-accent);
}

.page-about .device-panel__title {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
}

.page-about .device-panel__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .device-panel__list li {
  position: relative;
  padding: 7px 0 7px 24px;
  font-size: 14px;
  line-height: 1.5;
  border-bottom: 1px dashed var(--about-line);
}

.page-about .device-panel__list li:last-child {
  border-bottom: 0;
}

.page-about .device-panel__list li::before {
  content: "";
  position: absolute;
  top: 13px;
  left: 4px;
  width: 8px;
  height: 8px;
  background: var(--device-accent, var(--c-primary));
}

.page-about .device-visual {
  margin: 0;
}

.page-about .device-visual img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--c-border);
  background: var(--c-card);
}

.page-about .device-visual figcaption {
  padding: 8px 2px 0;
  font-size: 12px;
  color: var(--c-muted);
  text-align: right;
}

.page-about .about-section--entry {
  background: var(--c-section-a);
}

.page-about .entry-grid {
  display: grid;
  gap: 14px;
}

.page-about .entry-tile {
  position: relative;
  display: block;
  padding: 18px 18px 16px;
  border: 1px solid var(--c-border);
  border-left: 4px solid var(--entry-accent, var(--c-primary));
  background: rgba(36, 30, 46, 0.85);
  color: var(--c-text);
  text-decoration: none;
  overflow: hidden;
}

.page-about .entry-tile::after {
  content: "";
  position: absolute;
  right: -14px;
  bottom: -14px;
  width: 42px;
  height: 42px;
  background: var(--entry-accent, var(--c-primary));
  opacity: 0.18;
}

.page-about .entry-tile--archive {
  --entry-accent: var(--c-primary);
}

.page-about .entry-tile--updates {
  --entry-accent: var(--c-new);
}

.page-about .entry-tile--faq {
  --entry-accent: var(--c-tag-mid);
}

.page-about .entry-tile--feedback {
  --entry-accent: var(--c-accent);
}

.page-about .entry-tile:hover {
  border-color: var(--entry-accent, var(--c-primary));
}

.page-about .entry-tile:hover .entry-tile__go {
  color: var(--entry-accent, var(--c-primary));
}

.page-about .entry-tile__tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 2px 8px;
  border: 1px solid var(--c-border);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--entry-accent, var(--c-primary));
}

.page-about .entry-tile__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
}

.page-about .entry-tile__desc {
  margin: 0 0 10px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-muted);
}

.page-about .entry-tile__go {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--c-text);
}

.page-about .entry-grid__empty {
  margin: 0;
  padding: 16px;
  border: 1px dashed var(--c-border);
  background: rgba(36, 30, 46, 0.5);
  font-size: 14px;
  color: var(--c-muted);
}

.page-about .to-top {
  margin: 20px auto;
}

@media (min-width: 600px) {
  .page-about .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .tree-rank__grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (min-width: 900px) {
  .page-about .about-container {
    padding: 0 28px;
  }

  .page-about .about-hero h1 {
    font-size: 32px;
  }

  .page-about .stat-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }

  .page-about .category-layout {
    grid-template-columns: minmax(0, 1fr) 230px;
    align-items: start;
  }

  .page-about .route-flow {
    flex-direction: row;
    align-items: stretch;
    gap: 6px;
  }

  .page-about .route-step {
    flex: 1;
    padding: 14px 16px;
    border-left: 1px solid var(--c-border);
    border-top: 4px solid var(--c-primary);
  }

  .page-about .route-step__num {
    position: static;
    display: block;
    margin-bottom: 10px;
  }

  .page-about .route-arrow {
    align-self: center;
    transform: rotate(0deg);
    padding: 0 4px;
  }

  .page-about .version-table th,
  .page-about .version-table td {
    padding: 14px 18px;
  }

  .page-about .device-compare {
    grid-template-columns: 1fr 1fr;
    gap: 18px;
  }

  .page-about .device-visual figcaption {
    padding-top: 10px;
  }

  .page-about .entry-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }

  .page-about .entry-tile {
    padding: 20px 18px 18px;
    min-height: 190px;
  }
}

@media (min-width: 1200px) {
  .page-about .tree-rank__grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
  }
}