.page-about {
  background: var(--bg-deep-space);
  color: var(--text-primary);
  padding-bottom: 32px;
}

.page-about .about-hero {
  padding: 36px 0 40px;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(720px 220px at 85% 0%, rgba(185, 103, 255, .14), transparent 70%),
    linear-gradient(180deg, rgba(28, 42, 74, .35), rgba(255, 255, 255, 0));
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

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

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

.page-about .hero-row {
  display: grid;
  gap: 24px;
}

.page-about .page-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 32px;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
}

.page-about .page-subtitle {
  max-width: 720px;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
}

.page-about .hero-meta {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.page-about .hero-meta-title {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 14px;
  color: var(--text-primary);
}

.page-about .hero-spec {
  display: grid;
  gap: 6px;
  margin: 0;
}

.page-about .hero-spec div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  border-bottom: 1px dashed var(--border);
  padding-bottom: 6px;
}

.page-about .hero-spec div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .hero-spec dt {
  font-size: 12px;
  color: var(--text-muted);
}

.page-about .hero-spec dd {
  margin: 0;
  font-family: var(--font-data);
  font-size: 14px;
  color: var(--text-primary);
}

.page-about .hero-spec a {
  color: var(--accent-purple);
  text-decoration: none;
}

.page-about .section {
  padding: 56px 0 64px;
}

.page-about .section--blue {
  background: var(--bg-blue-tech);
}

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

.page-about .section-head {
  max-width: 760px;
  margin-bottom: 32px;
}

.page-about .section-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 28px;
  line-height: 1.2;
  margin: 0 0 8px;
}

.page-about .section-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.page-about .stat-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .stat-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 20px 18px;
  overflow: visible;
  transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
}

.page-about .stat-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  border-radius: 12px 12px 0 0;
}

.page-about .stat-card--total::before {
  background: var(--card-teal);
}

.page-about .stat-card--sections::before {
  background: var(--card-orange);
}

.page-about .stat-card--batches::before {
  background: var(--card-yellow);
}

.page-about .stat-card--coverage::before {
  background: var(--accent-purple);
}

.page-about .stat-card:hover {
  transform: translateY(-3px);
  border-color: rgba(185, 103, 255, .35);
}

.page-about .stat-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

.page-about .stat-num {
  margin: 2px 0 0;
  font-family: var(--font-data);
  font-size: 56px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
}

.page-about .stat-num--range {
  font-size: 32px;
}

.page-about .stat-card--total .stat-num {
  color: var(--card-teal);
}

.page-about .stat-card--sections .stat-num {
  color: var(--card-orange);
}

.page-about .stat-card--batches .stat-num {
  color: var(--card-yellow);
}

.page-about .stat-card--coverage .stat-num {
  color: var(--accent-purple);
}

.page-about .stat-unit {
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--text-secondary);
}

.page-about .stat-foot {
  margin-top: 2px;
  font-size: 12px;
  color: var(--text-muted);
}

.page-about .stat-pop {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 10px;
  right: 10px;
  z-index: 5;
  background: var(--bg-graphite);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-secondary);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity var(--ease), transform var(--ease);
  pointer-events: none;
  box-shadow: 0 8px 20px rgba(0, 0, 0, .3);
}

.page-about .stat-card:hover .stat-pop,
.page-about .stat-card:focus .stat-pop {
  opacity: 1;
  transform: translateY(0);
}

.page-about .zone-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .zone-card {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  padding: 24px 22px 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: 0 10px 28px rgba(0, 0, 0, .22);
  transition: transform var(--ease), box-shadow var(--ease);
}

.page-about .zone-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, .32);
}

.page-about .zone-card--orange {
  background: var(--card-orange);
}

.page-about .zone-card--teal {
  background: var(--card-teal);
}

.page-about .zone-card--yellow {
  background: var(--card-yellow);
}

.page-about .zone-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.page-about .zone-index {
  font-family: var(--font-data);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .05em;
  color: rgba(13, 16, 32, .55);
}

.page-about .zone-card .badge {
  background: rgba(13, 16, 32, .75);
  color: #fff;
  border-radius: 999px;
  padding: 4px 10px;
  font-family: var(--font-data);
  font-size: 12px;
}

.page-about .zone-card h3 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 24px;
  color: #0d1020;
}

.page-about .zone-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(13, 16, 32, .78);
}

.page-about .zone-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 4px;
}

.page-about .zone-card .tag {
  background: rgba(13, 16, 32, .13);
  color: #0d1020;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  padding: 5px 12px;
}

.page-about .zone-lower {
  display: grid;
  gap: 20px;
  margin-top: 28px;
  align-items: start;
}

.page-about .zone-figure,
.page-about .flow-figure,
.page-about .search-figure {
  margin: 0;
}

.page-about .zone-figure img,
.page-about .flow-figure img,
.page-about .search-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: 0 8px 24px rgba(0, 0, 0, .18);
}

.page-about .zone-figure figcaption,
.page-about .flow-figure figcaption,
.page-about .search-figure figcaption {
  margin-top: 8px;
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
}

.page-about .zone-table-wrap {
  overflow-x: auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.page-about .zone-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .zone-table th {
  padding: 14px 16px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: .05em;
  text-transform: uppercase;
  text-align: left;
  background: var(--bg-graphite);
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
}

.page-about .zone-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  line-height: 1.6;
}

.page-about .zone-table tr:last-child td {
  border-bottom: none;
}

.page-about .zone-table td:first-child {
  font-family: var(--font-data);
  font-weight: 600;
  color: var(--text-primary);
}

.page-about .zone-table td:nth-child(2) {
  font-family: var(--font-data);
  font-weight: 700;
  color: var(--card-teal);
  white-space: nowrap;
}

.page-about .flow-wrap,
.page-about .search-wrap {
  display: grid;
  gap: 28px;
  align-items: center;
}

.page-about .flow-left,
.page-about .search-left {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .flow-steps {
  display: flex;
  flex-direction: column;
}

.page-about .flow-step {
  position: relative;
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 16px;
  padding-bottom: 20px;
}

.page-about .flow-step:last-child {
  padding-bottom: 0;
}

.page-about .flow-step::before {
  content: "";
  position: absolute;
  left: 22px;
  top: 46px;
  bottom: -2px;
  width: 2px;
  background: linear-gradient(to bottom, var(--border), rgba(23, 26, 35, .2));
}

.page-about .flow-step:last-child::before {
  display: none;
}

.page-about .flow-num {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 700;
  position: relative;
  z-index: 1;
}

.page-about .flow-step:nth-child(1) .flow-num {
  color: var(--card-teal);
}

.page-about .flow-step:nth-child(2) .flow-num {
  color: var(--card-orange);
}

.page-about .flow-step:nth-child(3) .flow-num {
  color: var(--card-yellow);
}

.page-about .flow-step:nth-child(4) .flow-num {
  color: var(--accent-purple);
}

.page-about .flow-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.page-about .flow-card h3 {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 17px;
  color: var(--text-primary);
}

.page-about .flow-card p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.page-about .batch-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.page-about .batch-box h3 {
  margin: 0 0 4px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 17px;
  color: var(--text-primary);
}

.page-about .batch-box p {
  margin: 0 0 12px;
  font-size: 13px;
  color: var(--text-muted);
}

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

.page-about .batch-item {
  font-family: var(--font-data);
  font-size: 12px;
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  background: rgba(23, 26, 35, .35);
  transition: border-color var(--ease), color var(--ease);
}

.page-about .batch-item:hover {
  border-color: rgba(0, 229, 255, .5);
  color: var(--status-updating);
}

.page-about .batch-item--latest {
  border-color: rgba(0, 229, 255, .55);
  color: var(--status-updating);
  font-weight: 700;
  background: rgba(0, 229, 255, .08);
}

.page-about .search-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: searchStep;
  display: flex;
  flex-direction: column;
}

.page-about .search-list li {
  counter-increment: searchStep;
  position: relative;
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px dashed var(--border);
}

.page-about .search-list li:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .search-list li::before {
  content: counter(searchStep, decimal-leading-zero);
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 13px;
  color: var(--accent-purple);
  background: rgba(185, 103, 255, .13);
  border: 1px solid rgba(185, 103, 255, .3);
  border-radius: 10px;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
}

.page-about .search-step-body h3 {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 17px;
  color: var(--text-primary);
}

.page-about .search-step-body p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.page-about .search-mock {
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: rgba(23, 26, 35, .5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
}

.page-about .search-mock-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-deep-space);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
}

.page-about .search-mock-icon {
  font-size: 12px;
  color: var(--accent-purple);
  background: rgba(185, 103, 255, .15);
  border: 1px solid rgba(185, 103, 255, .3);
  border-radius: 6px;
  padding: 2px 6px;
}

.page-about .search-mock-text {
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--text-secondary);
}

.page-about .search-mock-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .mock-filter {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 8px;
}

.page-about .mock-filter--ok {
  border-color: rgba(0, 255, 136, .4);
  color: var(--status-green);
  background: rgba(0, 255, 136, .06);
}

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

.page-about .mock-tag {
  font-size: 12px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--bg-graphite);
  color: var(--text-secondary);
}

.page-about .retrieval-note {
  margin-top: 24px;
  padding: 12px 16px;
  font-size: 14px;
  color: var(--text-secondary);
  background: rgba(23, 26, 35, .35);
  border-left: 3px solid var(--accent-purple);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.page-about .retrieval-note a,
.page-about .catalog-link a {
  color: var(--accent-purple);
  text-decoration: none;
  font-weight: 600;
}

.page-about .retrieval-note a:hover,
.page-about .catalog-link a:hover {
  text-decoration: underline;
}

.page-about .adapt-grid {
  display: grid;
  gap: 16px;
}

.page-about .adapt-card {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 20px;
  transition: transform var(--ease), border-color var(--ease);
}

.page-about .adapt-card:hover {
  transform: translateY(-3px);
  border-color: rgba(185, 103, 255, .35);
}

.page-about .adapt-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 4px;
  height: 100%;
}

.page-about .adapt-card--v32::before {
  background: var(--card-teal);
}

.page-about .adapt-card--v20::before {
  background: var(--card-yellow);
}

.page-about .adapt-card--devices::before {
  background: var(--card-orange);
}

.page-about .adapt-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
}

.page-about .adapt-value {
  font-family: var(--font-data);
  font-size: 34px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

.page-about .adapt-card p {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.page-about .catalog-link {
  margin-top: 24px;
  text-align: right;
  font-size: 13px;
  color: var(--text-muted);
}

@media (min-width: 640px) {
  .page-about .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .stat-card {
    padding: 24px 22px 20px;
  }
}

@media (min-width: 900px) {
  .page-about .hero-row {
    grid-template-columns: minmax(0, 2fr) minmax(260px, 1fr);
    align-items: start;
  }

  .page-about .section {
    padding: 64px 0 72px;
  }

  .page-about .zone-cards {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .zone-lower {
    grid-template-columns: 5fr 4fr;
  }

  .page-about .flow-wrap {
    grid-template-columns: 7fr 5fr;
  }

  .page-about .search-wrap {
    grid-template-columns: 6fr 5fr;
  }

  .page-about .adapt-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about .stat-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .page-title {
    font-size: 36px;
  }
}