.page-about {
  --about-figure-bg: rgba(255,255,255,0.08);
  --about-body-text: #334155;
  --about-body-muted: #455363;
}

.page-about .container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 16px;
}

.page-about .about-breadcrumb {
  background: var(--bg-page);
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 20px 0 4px;
  font-family: var(--font-label);
  font-size: 13px;
  color: var(--text-muted-a);
}

.page-about .breadcrumb a {
  color: var(--text-muted-a);
  text-decoration: none;
  transition: color var(--transition);
}

.page-about .breadcrumb a:hover {
  color: var(--primary);
}

.page-about .breadcrumb .crumb-sep {
  color: var(--border);
}

.page-about .about-intro {
  background: linear-gradient(180deg, #FFFFFF 0%, var(--bg-page) 100%);
  padding: 24px 0 56px;
}

.page-about .about-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-label);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--tag-orange);
  text-transform: uppercase;
  margin: 0 0 14px;
}

.page-about .kicker-mark {
  width: 28px;
  height: 8px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--primary), var(--status-new));
  flex: 0 0 auto;
}

.page-about h1 {
  font-size: 28px;
  line-height: 1.25;
  font-weight: 900;
  color: var(--text-dark);
  margin: 0 0 16px;
  letter-spacing: -0.02em;
}

.page-about .about-lead {
  font-size: 16px;
  line-height: 1.75;
  color: var(--about-body-text);
  max-width: 68ch;
  margin: 0 0 28px;
}

.page-about .stat-card-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.page-about .stat-card {
  border-radius: var(--radius-lg);
  padding: 18px 16px;
  color: #fff;
  display: flex;
  flex-direction: column;
  gap: 4px;
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.08);
}

.page-about .stat-orange {
  background: linear-gradient(140deg, #FFB84D, var(--primary));
}

.page-about .stat-teal {
  background: linear-gradient(140deg, #4DD8CF, var(--cache));
}

.page-about .stat-pink {
  background: linear-gradient(140deg, #FF5CB8, var(--status-new));
}

.page-about .stat-blue {
  background: linear-gradient(140deg, #5CB8FF, var(--status-complete));
}

.page-about .stat-num {
  font-size: 30px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.page-about .stat-label {
  font-size: 13px;
  opacity: 0.92;
}

.page-about .about-desc {
  max-width: 72ch;
  line-height: 1.75;
  color: var(--about-body-muted);
  margin: 0;
}

.page-about .section-header {
  margin-bottom: 28px;
}

.page-about .section-header h2 {
  font-size: 28px;
  font-weight: 900;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.page-about .section-subtitle {
  font-size: 14px;
  color: var(--text-muted-a);
  margin: 0;
}

.page-about .about-category {
  background: var(--bg-section-dark);
  color: var(--text-light);
  padding: 48px 0;
}

.page-about .about-category .section-subtitle,
.page-about .about-updates .section-subtitle {
  color: var(--text-muted-b);
}

.page-about .category-layout {
  display: grid;
  gap: 32px;
}

.page-about .layer-stack {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.page-about .layer-card {
  border-radius: var(--radius-lg);
  padding: 20px;
  color: var(--text-dark);
  position: relative;
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.18);
}

.page-about .layer-type {
  background: linear-gradient(140deg, #FFB84D, var(--primary));
}

.page-about .layer-region {
  background: linear-gradient(140deg, #4DD8CF, var(--cache));
}

.page-about .layer-year {
  background: linear-gradient(140deg, #FF5CB8, var(--status-new));
}

.page-about .layer-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  background: rgba(255, 255, 255, 0.88);
  font-family: var(--font-label);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  color: var(--text-dark);
}

.page-about .layer-card h3 {
  margin: 0 0 4px;
  font-size: 20px;
  font-weight: 900;
}

.page-about .layer-count {
  margin: 0 0 12px;
  font-family: var(--font-label);
  font-size: 13px;
  opacity: 0.75;
}

.page-about .layer-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .layer-chips span {
  background: rgba(255, 255, 255, 0.84);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-family: var(--font-label);
}

.page-about .layer-arrow {
  text-align: center;
  font-size: 20px;
  color: rgba(255, 255, 255, 0.66);
  padding: 6px 0;
  line-height: 1;
}

.page-about .category-side {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-figure {
  margin: 0;
  background: var(--about-figure-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--text-muted-b);
  font-family: var(--font-label);
}

.page-about .tag-panel {
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.page-about .tag-panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  gap: 12px;
}

.page-about .tag-panel-head h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 800;
}

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

.page-about .tag {
  display: inline-block;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  font-family: var(--font-label);
  font-size: 12px;
  color: #fff;
  line-height: 1.5;
}

.page-about .tag-red { background: var(--tag-red); }
.page-about .tag-purple { background: var(--tag-purple); }
.page-about .tag-pink { background: var(--tag-pink); }
.page-about .tag-teal { background: var(--tag-teal); }
.page-about .tag-orange { background: var(--tag-orange); }

.page-about .tag-panel-more {
  font-size: 14px;
  color: var(--text-muted-b);
  margin: 16px 0 0;
  line-height: 1.6;
}

.page-about .tag-panel-more a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 215, 0, 0.4);
}

.page-about .about-updates {
  background: var(--bg-section-green);
  color: var(--text-light);
  padding: 48px 0;
}

.page-about .updates-layout {
  display: grid;
  gap: 32px;
}

.page-about .timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 22px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 4px;
  left: 7px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), rgba(255, 255, 255, 0.16));
  border-radius: 2px;
}

.page-about .timeline-node {
  position: relative;
}

.page-about .node-dot {
  position: absolute;
  left: -25px;
  top: 14px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--status-complete);
  border: 2px solid var(--bg-section-green);
}

.page-about .timeline-node.is-current .node-dot {
  background: var(--status-new);
  box-shadow: 0 0 0 4px rgba(255, 20, 147, 0.28);
}

.page-about .node-card {
  background: rgba(255, 255, 255, 0.07);
  border-radius: var(--radius-md);
  padding: 10px 14px;
}

.page-about .node-head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .node-batch {
  font-family: var(--font-label);
  font-weight: 700;
  font-size: 14px;
}

.page-about .node-count {
  font-size: 14px;
  margin: 2px 0 0;
  color: rgba(255, 255, 255, 0.8);
}

.page-about .timeline-node.is-current .node-card {
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 215, 0, 0.4);
}

.page-about .timeline-node.is-current .node-count {
  color: var(--accent);
  font-weight: 800;
}

.page-about .node-breakdown {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.62);
  margin: 6px 0 0;
  font-family: var(--font-label);
  line-height: 1.6;
}

.page-about .timeline-summary {
  margin-top: 8px;
  background: linear-gradient(140deg, rgba(255, 165, 0, 0.28), rgba(0, 206, 209, 0.22));
  border-radius: var(--radius-lg);
  padding: 16px;
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .summary-num {
  font-size: 28px;
  font-weight: 900;
  color: var(--accent);
  line-height: 1.1;
}

.page-about .summary-label {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.75);
}

.page-about .summary-note {
  flex-basis: 100%;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  font-family: var(--font-label);
}

.page-about .updates-aside {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .update-note {
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.page-about .update-note p {
  margin: 0 0 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-sync {
  background: var(--bg-page);
  padding: 48px 0;
}

.page-about .sync-board {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about .sync-devices {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.page-about .device-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 18px 12px;
  text-align: center;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
  flex: 1 1 0;
  min-width: 0;
}

.page-about .device-icon {
  width: 38px;
  height: 58px;
  border-radius: 8px;
  margin: 0 auto 12px;
  border: 4px solid currentColor;
  position: relative;
  background: #fff;
}

.page-about .device-icon::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 5px;
  transform: translateX(-50%);
  width: 10px;
  height: 3px;
  border-radius: 2px;
  background: currentColor;
}

.page-about .device-ios { color: var(--primary); }
.page-about .device-android { color: var(--status-complete); }

.page-about .device-card h3 {
  margin: 0 0 2px;
  font-size: 16px;
  color: var(--text-dark);
}

.page-about .device-version {
  font-family: var(--font-label);
  font-size: 14px;
  color: var(--text-muted-a);
  margin: 0 0 8px;
}

.page-about .device-tag {
  display: inline-block;
  font-size: 12px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: var(--bg-card-alt);
  color: var(--text-muted-a);
  font-family: var(--font-label);
}

.page-about .sync-arrow {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  color: var(--status-new);
  flex: 0 0 auto;
}

.page-about .sync-arrow-line {
  width: 24px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--status-new));
  border-radius: 2px;
}

.page-about .sync-arrow-head {
  font-size: 20px;
  line-height: 1;
}

.page-about .sync-columns {
  display: grid;
  gap: 24px;
}

.page-about .sync-info,
.page-about .sync-export {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.06);
}

.page-about .sync-info h3,
.page-about .sync-export h3 {
  margin: 0 0 12px;
  font-size: 18px;
  color: var(--text-dark);
}

.page-about .sync-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .sync-list li {
  padding-left: 22px;
  position: relative;
  line-height: 1.6;
  color: var(--about-body-text);
}

.page-about .sync-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 3px;
  background: var(--cache);
}

.page-about .sync-export p {
  line-height: 1.7;
  color: var(--about-body-text);
  margin: 0 0 16px;
}

.page-about .about-figures {
  background: #fff;
  padding: 48px 0;
}

.page-about .table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-bottom: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.page-about .data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  min-width: 560px;
}

.page-about .data-table th {
  background: var(--bg-section-dark);
  color: #fff;
  text-align: left;
  padding: 10px 14px;
  font-family: var(--font-label);
  font-weight: 700;
}

.page-about .data-table td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text-dark);
}

.page-about .data-table tbody tr:nth-child(even) td {
  background: var(--bg-card-alt);
}

.page-about .data-table tbody tr td:first-child {
  font-weight: 700;
}

.page-about .data-table td:nth-child(2) {
  font-family: var(--font-label);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.page-about .data-table tfoot td {
  padding: 12px 14px;
  font-weight: 800;
  background: #FFF8E6;
  border-bottom: none;
}

.page-about .data-table tfoot td:nth-child(2) {
  font-weight: 900;
}

.page-about .bar {
  display: block;
  height: 10px;
  width: 0;
  max-width: 100%;
  background: linear-gradient(90deg, var(--primary), var(--cache));
  border-radius: var(--radius-pill);
}

.page-about .bar-total {
  height: 12px;
  background: linear-gradient(90deg, var(--status-new), var(--primary));
}

.page-about .figures-note {
  background: var(--bg-card-alt);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-body-muted);
  margin: 16px 0 0;
}

.page-about .about-more {
  background: linear-gradient(140deg, var(--bg-section-dark), #223344);
  padding: 48px 0;
}

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

.page-about .about-link-card {
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 20px;
  text-decoration: none;
  color: var(--text-light);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform var(--transition), background var(--transition);
  border: 1px solid transparent;
}

.page-about .about-link-card:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-3px);
  border-color: rgba(255, 215, 0, 0.35);
}

.page-about .link-index {
  font-family: var(--font-label);
  font-size: 13px;
  color: var(--accent);
}

.page-about .link-title {
  font-size: 20px;
  font-weight: 900;
}

.page-about .link-desc {
  font-size: 13px;
  color: var(--text-muted-b);
  line-height: 1.5;
}

@media (min-width: 768px) {
  .page-about h1 {
    font-size: 40px;
  }

  .page-about .about-intro {
    padding: 40px 0 72px;
  }

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

  .page-about .stat-num {
    font-size: 34px;
  }

  .page-about .category-layout {
    grid-template-columns: 5fr 7fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .layer-card {
    padding: 24px;
  }

  .page-about .updates-layout {
    grid-template-columns: 7fr 5fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .sync-devices {
    gap: 20px;
  }

  .page-about .device-card {
    flex: 0 1 200px;
    padding: 24px 20px;
  }

  .page-about .device-icon {
    width: 48px;
    height: 74px;
    border-radius: 10px;
  }

  .page-about .sync-arrow-line {
    width: 48px;
  }

  .page-about .sync-columns {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

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

  .page-about .about-more {
    padding: 64px 0;
  }

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

@media (min-width: 1024px) {
  .page-about h1 {
    font-size: 48px;
  }

  .page-about .about-lead {
    font-size: 18px;
  }

  .page-about .section-header h2 {
    font-size: 32px;
  }
}