.page-about {
  --about-hero-glow: #eef6f6;
  --about-table-even: #f1f7f7;
  --about-table-total: #eae5d7;
  --about-update-panel: rgba(255, 255, 255, 0.06);
  --about-update-line: rgba(255, 255, 255, 0.14);
  --about-update-copy: rgba(255, 255, 255, 0.72);
  --about-chips-bg: #ffffff;
  background: var(--page-bg);
  color: var(--text-main);
  font-family: var(--font-sans);
}

.page-about__inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 40px 20px;
}

.page-about__hero {
  background: linear-gradient(135deg, var(--page-bg) 0%, var(--about-hero-glow) 100%);
  padding: 28px 0 0;
}

.page-about__hero .page-about__inner {
  padding-top: 16px;
  padding-bottom: 36px;
}

.page-about__crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-second);
  margin-bottom: 22px;
}

.page-about__crumb {
  color: var(--text-second);
  text-decoration: none;
}

.page-about__crumb:hover {
  color: var(--cat-blue);
}

.page-about__crumb-sep {
  opacity: 0.65;
}

.page-about__crumb-current {
  color: var(--text-main);
  font-weight: 700;
}

.page-about__hero-grid {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.page-about__hero-copy {
  flex: 1;
  min-width: 0;
}

.page-about__kicker {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cat-blue);
  margin: 0 0 8px;
}

.page-about__title {
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1.2;
  font-weight: 900;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
  overflow-wrap: break-word;
}

.page-about__lede {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-second);
  max-width: 780px;
  margin: 0;
}

.page-about__quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.page-about__chip {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  background: var(--about-chips-bg);
  color: var(--text-main);
  font-weight: 700;
  font-size: 13px;
  box-shadow: var(--shadow-soft);
  text-decoration: none;
  border: 1px solid var(--border-soft);
  transition: border-color var(--transition), color var(--transition);
}

.page-about__chip:hover {
  border-color: var(--cat-blue);
  color: var(--cat-blue);
}

.page-about__hero-tile {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  border-radius: var(--radius-md);
  object-fit: cover;
  display: block;
  box-shadow: var(--shadow-soft);
}

.page-about__section-head {
  margin-bottom: 26px;
}

.page-about__section-tag {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cat-orange);
  font-weight: 700;
  margin: 0 0 6px;
}

.page-about__section-title {
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 900;
  line-height: 1.2;
  margin: 0 0 10px;
}

.page-about__section-sub {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-second);
  max-width: 760px;
  margin: 0;
}

.page-about__scope {
  background: var(--page-bg-cool);
}

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

.page-about__summary-item {
  background: var(--surface);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-left: 4px solid var(--cat-blue);
}

.page-about__summary-item:nth-child(2) {
  border-left-color: var(--hot-yellow);
}

.page-about__summary-item:nth-child(3) {
  border-left-color: var(--cat-orange);
}

.page-about__summary-item:nth-child(4) {
  border-left-color: var(--cat-violet);
}

.page-about__summary-item span {
  font-size: 12px;
  color: var(--text-second);
}

.page-about__summary-item strong {
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
}

.page-about__table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.page-about__scope-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about__scope-table th,
.page-about__scope-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border-soft);
  white-space: nowrap;
}

.page-about__scope-table thead th {
  background: var(--dark-bg);
  color: #fff;
  font-size: 13px;
  letter-spacing: 0.04em;
  font-family: var(--font-mono);
}

.page-about__scope-table thead th:first-child {
  border-top-left-radius: var(--radius-lg);
}

.page-about__scope-table thead th:last-child {
  border-top-right-radius: var(--radius-lg);
}

.page-about__scope-table tbody th {
  font-weight: 700;
  color: var(--text-main);
}

.page-about__scope-table tbody tr:nth-child(even) {
  background: var(--about-table-even);
}

.page-about__scope-table tbody tr:hover {
  background: var(--page-bg-cool);
}

.page-about__scope-table tbody td {
  font-family: var(--font-mono);
}

.page-about__scope-table tbody tr:nth-child(1) th {
  border-left: 4px solid var(--cat-blue);
}

.page-about__scope-table tbody tr:nth-child(2) th {
  border-left: 4px solid var(--cat-violet);
}

.page-about__scope-table tbody tr:nth-child(3) th {
  border-left: 4px solid var(--hot-coral);
}

.page-about__scope-table tbody tr:nth-child(4) th {
  border-left: 4px solid var(--hot-yellow);
}

.page-about__scope-table tbody tr:nth-child(5) th {
  border-left: 4px solid var(--success-green);
}

.page-about__scope-table tbody tr:nth-child(6) th {
  border-left: 4px solid var(--cat-orange);
}

.page-about__scope-table tbody tr:nth-child(7) th {
  border-left: 4px solid var(--cat-blue);
}

.page-about__scope-table tbody tr:nth-child(8) th {
  border-left: 4px solid var(--replay-olive);
}

.page-about__scope-table tfoot th,
.page-about__scope-table tfoot td {
  border-bottom: none;
  font-weight: 900;
  background: var(--about-table-total);
}

.page-about__status-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about__status-tag {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: var(--surface);
  color: var(--text-main);
  box-shadow: var(--shadow-soft);
}

.page-about__status-tag--live {
  border: 1px solid var(--live-blue);
  color: var(--live-blue);
}

.page-about__status-tag--replay {
  border: 1px solid var(--replay-olive);
  color: var(--replay-olive);
}

.page-about__status-tag--new {
  border: 1px solid var(--success-green);
  color: var(--success-green);
}

.page-about__status-tag--done {
  border: 1px solid var(--hot-coral);
  color: var(--hot-coral);
}

.page-about__status-tag--quality {
  border: 1px solid var(--quality-orange);
  color: var(--quality-orange);
}

.page-about__versions {
  background: var(--page-bg);
  border-top: 1px solid var(--border-soft);
}

.page-about__version-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 12px;
}

.page-about__version-figure {
  width: 100%;
  max-width: 220px;
  height: auto;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--dark-bg), #1f3344);
  padding: 12px;
  object-fit: cover;
}

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

.page-about__version-card {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-soft);
}

.page-about__version-card:nth-child(1) {
  border-top: 4px solid var(--cat-blue);
}

.page-about__version-card:nth-child(2) {
  border-top: 4px solid var(--quality-orange);
}

.page-about__version-card:nth-child(3) {
  border-top: 4px solid var(--hot-coral);
}

.page-about__version-card:nth-child(4) {
  border-top: 4px solid var(--replay-olive);
}

.page-about__version-title {
  font-size: 17px;
  font-weight: 900;
  margin: 0 0 8px;
  color: var(--text-main);
}

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

.page-about__quality-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 24px;
  padding: 14px 18px;
  background: var(--page-bg-cool);
  border-radius: var(--radius-pill);
}

.page-about__quality-label {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--text-second);
}

.page-about__quality-tag {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  border-radius: var(--radius-pill);
  padding: 4px 10px;
  background: var(--surface);
  color: var(--quality-orange);
  border: 1px solid var(--quality-orange);
}

.page-about__updates {
  background: var(--dark-bg);
  color: #fff;
}

.page-about__updates .page-about__section-title {
  color: #fff;
}

.page-about__updates .page-about__section-sub {
  color: var(--about-update-copy);
}

.page-about__updates .page-about__section-tag {
  color: var(--neon-cyan);
}

.page-about__timeline-wrap {
  position: relative;
  overflow: visible;
}

.page-about__timeline-texture {
  display: block;
  width: 100%;
  max-width: 600px;
  height: auto;
  object-fit: cover;
  opacity: 0.5;
  border-radius: var(--radius-md);
  margin-bottom: 16px;
}

.page-about__timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about__timeline-item {
  background: var(--about-update-panel);
  border: 1px solid var(--about-update-line);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: transform var(--transition), border-color var(--transition);
}

.page-about__timeline-item:hover {
  transform: translateY(-4px);
  border-color: var(--neon-cyan);
}

.page-about__timeline-item--latest {
  border-color: var(--neon-green);
}

.page-about__timeline-batch {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.page-about__batch-no {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--neon-cyan);
}

.page-about__timeline-badge {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  background: var(--neon-green);
  color: #000;
}

.page-about__timeline-heading {
  margin: 0 0 8px;
  font-size: 17px;
  color: #fff;
}

.page-about__timeline-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--about-update-copy);
}

.page-about__updates-link {
  margin-top: 24px;
}

.page-about__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  background: var(--cat-blue);
  color: var(--dark-bg);
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  box-shadow: var(--shadow-soft);
}

.page-about__retrieval {
  background: var(--page-bg-cool);
}

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

.page-about__retrieval-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about__retrieval-icon {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--cat-orange);
  margin: 0;
}

.page-about__retrieval-card:nth-child(2) .page-about__retrieval-icon {
  color: var(--cat-violet);
}

.page-about__retrieval-card:nth-child(3) .page-about__retrieval-icon {
  color: var(--cat-blue);
}

.page-about__retrieval-card:nth-child(4) .page-about__retrieval-icon {
  color: var(--quality-orange);
}

.page-about__retrieval-title {
  margin: 0;
  font-size: 18px;
  font-weight: 900;
}

.page-about__retrieval-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-second);
  flex: 1;
}

.page-about__retrieval-link {
  color: var(--cat-blue);
  font-weight: 700;
  text-decoration: none;
  font-size: 14px;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition);
}

.page-about__retrieval-link:hover {
  border-color: var(--cat-blue);
}

.page-about__footnote {
  margin-top: 28px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-second);
}

.page-about__footnote a {
  color: var(--cat-blue);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px solid var(--cat-blue);
}

@media (min-width: 768px) {
  .page-about__hero-tile {
    width: 80px;
    height: 80px;
  }

  .page-about__summary-grid {
    grid-template-columns: repeat(4, 1fr);
  }

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

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

@media (min-width: 900px) {
  .page-about__timeline {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about__inner {
    padding: 48px 32px;
  }

  .page-about__version-layout {
    grid-template-columns: 220px 1fr;
    align-items: start;
  }

  .page-about__retrieval-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}