.page-about {
  --about-ink: #1a1a1a;
  --about-chip-bg: rgba(26, 26, 26, 0.24);
  color: var(--text-light);
  font-family: var(--font-body);
}

.page-about .about-breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 14px;
  color: var(--muted);
  margin-bottom: 14px;
}

.page-about .about-breadcrumb .breadcrumb-link {
  color: var(--accent-blue);
  text-decoration: none;
}

.page-about .about-breadcrumb .breadcrumb-arrow {
  color: var(--muted);
}

.page-about .about-breadcrumb .breadcrumb-current {
  color: var(--text-light);
}

.page-about .about-head {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 20px 20px 30px;
}

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

.page-about .about-head-text h1 {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(30px, 5vw, 48px);
  line-height: 1.08;
  color: var(--text-light);
  margin: 0 0 8px;
}

.page-about .about-lead {
  font-size: 16px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 760px;
  margin: 0;
}

.page-about .about-lead strong {
  color: var(--accent-yellow);
  font-family: var(--font-mono);
}

.page-about .about-head-index {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-blue);
  letter-spacing: 1px;
}

.page-about .about-head-index span {
  padding: 2px 3px;
  opacity: 0.55;
}

.page-about .about-head-index span:nth-child(3n) {
  color: var(--accent-yellow);
  opacity: 0.9;
}

.page-about .about-head-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .about-head-stat {
  background: var(--panel);
  border: 1px solid var(--border-gray);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-head-stat dt {
  font-size: 12px;
  color: var(--muted);
}

.page-about .about-head-stat dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--accent-yellow);
}

.page-about .about-section {
  padding: 42px 0 52px;
}

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

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

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

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

.page-about .about-section-inner {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 20px;
}

.page-about .section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.page-about .section-title {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.2;
  color: var(--text-light);
  margin: 0;
}

.page-about .section-more {
  font-size: 13px;
  color: var(--muted);
  font-family: var(--font-mono);
}

.page-about .about-scale-fig,
.page-about .about-tree-fig,
.page-about .about-version-fig {
  margin: 0;
}

.page-about .about-scale-fig img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 2px solid var(--border-gray);
  display: block;
  margin-bottom: 22px;
}

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

.page-about .about-stat-card {
  border-radius: var(--radius-lg);
  padding: 20px 18px 22px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.22);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-stat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.32);
}

.page-about .about-stat-card--amber {
  background: var(--bg-amber);
  color: var(--text-dark);
}

.page-about .about-stat-card--teal {
  background: var(--bg-teal);
  color: var(--text-dark);
  --bar-color: rgba(26, 26, 26, 0.75);
}

.page-about .about-stat-card--pink {
  background: var(--bg-pink);
  color: var(--text-dark);
  --bar-color: rgba(26, 26, 26, 0.75);
}

.page-about .about-stat-card--maroon {
  background: var(--bg-maroon);
  color: var(--text-light);
  --bar-color: var(--accent-yellow);
}

.page-about .about-stat-card--yellow {
  background: var(--accent-yellow);
  color: var(--text-dark);
  --bar-color: rgba(26, 26, 26, 0.75);
}

.page-about .about-stat-card--navy {
  background: var(--bg-navy);
  color: var(--text-light);
  --bar-color: var(--accent-blue);
}

.page-about .about-stat-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.page-about .about-stat-name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 18px;
  margin: 0;
}

.page-about .about-stat-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  background: rgba(26, 26, 26, 0.16);
  white-space: nowrap;
}

.page-about .about-stat-subline {
  margin: -4px 0 0;
  font-size: 13px;
  opacity: 0.75;
}

.page-about .about-stat-bignum {
  font-family: var(--font-mono);
  font-size: 56px;
  line-height: 1;
  font-weight: 700;
}

.page-about .about-stat-bignum small {
  font-size: 20px;
  margin-left: 4px;
  font-weight: 400;
}

.page-about .about-total-body {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.page-about .about-total-copy {
  flex: 1;
  min-width: 160px;
}

.page-about .about-total-desc {
  font-size: 14px;
  line-height: 1.6;
  margin: 10px 0 0;
  opacity: 0.8;
}

.page-about .about-donut {
  width: 108px;
  height: 108px;
  border-radius: 50%;
  background: conic-gradient(var(--bg-green) 0 14%, var(--bg-teal) 14% 40%, var(--accent-blue) 40% 78%, var(--bg-pink) 78% 100%);
  display: grid;
  place-items: center;
  box-shadow: inset 0 0 0 6px rgba(26, 26, 26, 0.15);
  flex-shrink: 0;
}

.page-about .about-donut-hole {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: var(--bg-amber);
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--text-dark);
}

.page-about .about-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-bar-row {
  display: grid;
  grid-template-columns: 54px 1fr 40px;
  align-items: center;
  gap: 8px;
  color: var(--bar-color, var(--text-dark));
}

.page-about .about-bar-label {
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .about-bar-track {
  height: 9px;
  background: rgba(26, 26, 26, 0.16);
  border-radius: var(--radius-pill);
  overflow: hidden;
  display: block;
}

.page-about .about-bar-track i {
  display: block;
  height: 100%;
  border-radius: var(--radius-pill);
  background: currentColor;
  transition: width 0.3s ease;
}

.page-about .about-stat-card:hover .about-bar-track i {
  filter: brightness(1.1);
}

.page-about .about-bar-num {
  font-family: var(--font-mono);
  font-size: 14px;
  text-align: right;
}

.page-about .about-tree-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  align-items: start;
}

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

.page-about .about-tree-node {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.page-about .about-tree-node--amber .about-tree-l1 {
  background: var(--bg-amber);
  color: var(--text-dark);
}

.page-about .about-tree-node--teal .about-tree-l1 {
  background: var(--bg-teal);
  color: var(--text-dark);
}

.page-about .about-tree-node--pink .about-tree-l1 {
  background: var(--bg-pink);
  color: var(--text-dark);
}

.page-about .about-tree-node--yellow .about-tree-l1 {
  background: var(--accent-yellow);
  color: var(--text-dark);
}

.page-about .about-tree-l1 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  text-decoration: none;
  transition: filter 0.2s ease;
}

.page-about .about-tree-l1:hover {
  filter: brightness(1.08);
}

.page-about .about-tree-l1-name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 21px;
}

.page-about .about-tree-l1-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 16px;
  opacity: 0.75;
}

.page-about .about-tree-l2 {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  padding: 14px 16px 18px;
  background: rgba(26, 26, 26, 0.24);
}

.page-about .about-chip {
  background: rgba(26, 26, 26, 0.24);
  border-radius: var(--radius-pill);
  padding: 5px 12px;
  font-size: 14px;
  color: var(--text-light);
  text-decoration: none;
  transition: background 0.2s ease, transform 0.2s ease;
}

.page-about .about-chip b {
  font-family: var(--font-mono);
  font-size: 13px;
  margin-left: 4px;
  color: var(--accent-yellow);
}

.page-about .about-chip:hover {
  background: rgba(26, 26, 26, 0.4);
  transform: translateY(-2px);
}

.page-about .about-tree-fig img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 2px solid rgba(255, 255, 255, 0.12);
  display: block;
}

.page-about .about-tagcloud {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cloud-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(20, 26, 32, 0.42);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-pill);
  font-family: var(--font-head);
  font-weight: 900;
  color: var(--text-light);
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease;
}

.page-about .about-cloud-tag:hover {
  transform: translateY(-3px);
  background: rgba(20, 26, 32, 0.68);
}

.page-about .about-cloud-tag .about-cloud-name {
  color: var(--text-light);
}

.page-about .about-cloud-tag:nth-child(3n) .about-cloud-name {
  color: var(--accent-blue);
}

.page-about .about-cloud-tag:nth-child(4n) .about-cloud-name {
  color: var(--accent-yellow);
}

.page-about .about-cloud-tag .about-cloud-num {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: var(--accent-yellow);
  color: var(--text-dark);
  border-radius: var(--radius-pill);
  padding: 2px 9px;
  font-weight: 700;
  line-height: 1.4;
}

.page-about .about-cloud-tag--xl {
  font-size: 24px;
  padding: 10px 20px;
}

.page-about .about-cloud-tag--lg {
  font-size: 19px;
  padding: 8px 16px;
}

.page-about .about-cloud-tag--md {
  font-size: 15px;
  padding: 6px 13px;
}

.page-about .about-cloud-tag--sm {
  font-size: 13px;
  padding: 5px 10px;
}

.page-about .about-update-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-update-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.page-about .about-metric {
  border-radius: var(--radius-md);
  padding: 16px 10px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
  justify-content: center;
  min-height: 96px;
}

.page-about .about-metric--yellow {
  background: var(--accent-yellow);
  color: var(--text-dark);
}

.page-about .about-metric--cyan {
  background: var(--accent-blue);
  color: var(--text-dark);
}

.page-about .about-metric--green {
  background: var(--status-new);
  color: var(--text-dark);
}

.page-about .about-metric-num {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
}

.page-about .about-metric-label {
  font-size: 13px;
  opacity: 0.8;
}

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

.page-about .about-timeline-step {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  align-items: center;
  gap: 10px;
  background: rgba(26, 26, 26, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  text-decoration: none;
  color: var(--text-light);
  transition: transform 0.2s ease, background 0.2s ease;
}

.page-about .about-timeline-step:hover {
  transform: translateY(-2px);
  background: rgba(26, 26, 26, 0.48);
}

.page-about .about-timeline-step--now {
  background: var(--accent-yellow);
  color: var(--text-dark);
  border-color: var(--accent-yellow);
}

.page-about .about-timeline-batch {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 17px;
}

.page-about .about-timeline-count {
  font-size: 14px;
  opacity: 0.8;
}

.page-about .about-timeline-badge {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.16);
  white-space: nowrap;
}

.page-about .about-timeline-step--now .about-timeline-badge {
  background: rgba(26, 26, 26, 0.2);
  color: var(--text-dark);
}

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

.page-about .about-version-card {
  border-radius: var(--radius-lg);
  padding: 24px 22px 26px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.22);
}

.page-about .about-version-card--archive {
  background: var(--bg-amber);
  color: var(--text-dark);
}

.page-about .about-version-card--web {
  background: var(--bg-teal);
  color: var(--text-dark);
}

.page-about .about-version-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .about-version-name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 20px;
}

.page-about .about-version-badge {
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: rgba(26, 26, 26, 0.16);
  white-space: nowrap;
}

.page-about .about-version-lead {
  font-size: 14px;
  opacity: 0.8;
  margin: -6px 0 0;
}

.page-about .about-version-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-version-list li {
  padding-left: 20px;
  position: relative;
  font-size: 14px;
  line-height: 1.55;
}

.page-about .about-version-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--text-dark);
  opacity: 0.7;
}

.page-about .about-version-card .btn {
  align-self: flex-start;
  margin-top: 6px;
}

.page-about .about-version-history {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-version-step {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: center;
  gap: 12px;
  background: rgba(26, 26, 26, 0.28);
  border: 1px solid var(--border-gray);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}

.page-about .about-version-step--current {
  border-color: var(--accent-yellow);
  background: rgba(255, 224, 102, 0.09);
}

.page-about .about-version-step-ver {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 18px;
  color: var(--text-light);
}

.page-about .about-version-step--current .about-version-step-ver {
  color: var(--accent-yellow);
}

.page-about .about-version-step-state {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.12);
  white-space: nowrap;
}

.page-about .about-version-step--current .about-version-step-state {
  background: var(--accent-yellow);
  color: var(--text-dark);
}

.page-about .about-version-step-note {
  font-size: 14px;
  color: var(--text-light);
  opacity: 0.85;
  margin: 0;
}

.page-about .about-version-fig {
  margin: 24px 0 0;
}

.page-about .about-version-fig img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  border: 2px solid var(--border-gray);
  display: block;
}

@media (min-width: 640px) {
  .page-about .about-head-stats {
    grid-template-columns: repeat(4, 1fr);
  }

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

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

@media (min-width: 920px) {
  .page-about .about-head {
    padding-top: 28px;
  }

  .page-about .about-head-grid {
    grid-template-columns: 1fr auto;
    align-items: end;
  }

  .page-about .about-head-index {
    max-width: 340px;
    justify-content: flex-end;
  }

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

  .page-about .about-stat-card--total {
    grid-column: 1 / -1;
  }

  .page-about .about-stat-card--navy {
    grid-column: span 2;
  }

  .page-about .about-total-body {
    align-items: center;
  }

  .page-about .about-tree-grid {
    grid-template-columns: 1fr 280px;
  }

  .page-about .about-update-grid {
    grid-template-columns: 1fr 1.6fr;
    align-items: start;
  }

  .page-about .about-update-metrics {
    grid-template-columns: 1fr;
  }

  .page-about .about-timeline {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-version-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-version-history {
    grid-template-columns: 1fr 1fr;
  }
}