.page-about {
  --about-ink: #2b261f;
  --about-ink-soft: #5d554a;
  --about-panel-2: #e7dfd2;
  --about-line: rgba(43, 38, 31, 0.16);
  background: var(--bg-dark);
  color: var(--ivory);
  font-family: var(--font-body);
  line-height: 1.7;
}

.page-about .ab-doc {
  background: transparent;
}

.page-about .ab-wrap {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 20px;
}

.page-about p {
  margin: 0 0 16px;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin-top: 0;
}

.page-about h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ivory);
  margin: 16px 0 20px;
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.4rem, 3vw, 2.4rem);
  line-height: 1.26;
  letter-spacing: -0.02em;
  color: var(--ivory);
  margin: 0 0 14px;
}

.page-about .ab-lead {
  font-size: 1.06rem;
  color: var(--text-sub);
  max-width: 58ch;
}

.page-about .ab-lead-sub {
  color: var(--text-dim);
  font-size: 0.94rem;
  max-width: 62ch;
}

.page-about .ab-cover {
  background: var(--bg-dark);
  padding: 36px 0 48px;
  scroll-margin-top: 72px;
}

.page-about .ab-cover-mark {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 0;
}

.page-about .ab-cover-mark span + span::before {
  content: " / ";
  margin: 0 8px;
  color: var(--text-dim);
}

.page-about .ab-cover-grid {
  display: grid;
  gap: 30px;
  align-items: center;
  margin-top: 20px;
}

.page-about .ab-cover-copy {
  min-width: 0;
}

.page-about .ab-cover-fig {
  position: relative;
  margin: 0;
  border: 1px solid var(--line-gold);
}

.page-about .ab-cover-fig::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(201, 160, 99, 0.4);
  pointer-events: none;
}

.page-about .ab-cover-fig img {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .ab-phrases {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-phrases li {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-sub);
  border-left: 2px solid var(--line-gold);
  padding-left: 12px;
}

.page-about .ab-cover-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.page-about .ab-toc {
  background: var(--bg-void);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-gold);
  padding: 14px 0;
}

.page-about .ab-toc-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 18px;
}

.page-about .ab-toc-title {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .ab-toc a {
  color: var(--text-sub);
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 0.88rem;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .ab-toc a:hover {
  color: var(--ivory);
  border-bottom-color: var(--red-core);
}

.page-about .ab-chapter {
  padding: 48px 0;
  scroll-margin-top: 72px;
}

.page-about .ab-chapter--void {
  background: var(--bg-void);
  color: var(--ivory);
}

.page-about .ab-chapter--dark {
  background: var(--bg-dark);
  color: var(--ivory);
}

.page-about .ab-chapter--ivory {
  background: var(--ivory);
  color: var(--about-ink);
}

.page-about .ab-chapter--sand {
  background: var(--about-panel-2);
}

.page-about .ab-chapter--ivory h2,
.page-about .ab-chapter--ivory h3 {
  color: var(--about-ink);
}

.page-about .ab-chapter--ivory p {
  color: var(--about-ink-soft);
}

.page-about .ab-chapter--ivory .ab-lead,
.page-about .ab-chapter--ivory .ab-quote {
  color: var(--about-ink);
}

.page-about .ab-chapter-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-chapter--ivory .ab-chapter-head {
  border-bottom-color: var(--about-line);
}

.page-about .ab-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--red-core);
}

.page-about .ab-chapter--ivory .ab-num {
  color: var(--red-dim);
}

.page-about .ab-kicker {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .ab-chapter--ivory .ab-kicker {
  color: #8f6b35;
}

.page-about .ab-split {
  margin-top: 24px;
}

.page-about .ab-quote {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.12rem, 2vw, 1.5rem);
  line-height: 1.5;
  margin: 18px 0 20px;
  padding-left: 16px;
  border-left: 4px solid var(--red-core);
}

.page-about .ab-chapter--ivory .ab-quote {
  border-left-color: var(--red-dim);
}

.page-about .ab-scene-note {
  border: 1px dashed var(--line-gold);
  background: rgba(201, 160, 99, 0.05);
  padding: 16px 18px;
  margin: 24px 0 0;
  font-size: 0.94rem;
}

.page-about .ab-scene-note strong {
  color: var(--gold);
  font-family: var(--font-mono);
  font-weight: 600;
}

.page-about .ab-pin-demo {
  display: flex;
  align-items: center;
  gap: 12px;
  border: 1px solid var(--line-gold);
  background: rgba(201, 160, 99, 0.06);
  padding: 16px 18px;
  margin: 24px 0 0;
}

.page-about .ab-pin-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--red-core);
  flex-shrink: 0;
}

.page-about .ab-pin-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--ivory);
}

.page-about .ab-pin-badge {
  margin-left: auto;
  border: 1px solid var(--red-core);
  color: var(--ivory);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 3px 8px;
  white-space: nowrap;
}

.page-about .ab-panel-demo {
  border: 1px solid var(--about-line);
  background: rgba(255, 255, 255, 0.5);
  padding: 18px;
  margin-top: 24px;
}

.page-about .ab-panel-tabs {
  display: flex;
  gap: 6px;
  border-bottom: 1px solid var(--about-line);
  padding-bottom: 10px;
}

.page-about .ab-panel-tab {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  padding: 7px 14px;
  border: 1px solid var(--about-line);
  border-bottom: none;
  color: var(--about-ink-soft);
}

.page-about .ab-panel-tab:first-child {
  background: var(--red-core);
  border-color: var(--red-core);
  color: #fff;
}

.page-about .ab-metric-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .ab-metric-list li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--about-line);
  font-family: var(--font-mono);
  font-size: 0.86rem;
}

.page-about .ab-metric-list li:last-child {
  border-bottom: none;
}

.page-about .ab-metric-list li span:last-child {
  color: var(--red-dim);
  font-weight: 700;
}

.page-about .ab-panel-note {
  font-size: 0.78rem;
  color: var(--text-dim);
  margin: 10px 0 0;
}

.page-about figure {
  margin: 0;
}

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

.page-about .ab-fig {
  margin-top: 24px;
}

.page-about .ab-fig--bordered {
  border: 1px solid var(--line-soft);
  padding: 8px;
}

.page-about .ab-fig img {
  width: 100%;
}

.page-about figcaption {
  margin-top: 12px;
  font-size: 0.82rem;
  color: var(--text-dim);
}

.page-about .ab-chapter--ivory .ab-fig--bordered {
  border-color: var(--about-line);
}

.page-about .ab-chapter--ivory figcaption {
  color: var(--about-ink-soft);
}

.page-about .ab-stats-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 28px 0;
}

.page-about .ab-stat {
  flex: 1 1 120px;
  min-width: 0;
  border-top: 3px solid var(--red-core);
  padding-top: 12px;
}

.page-about .ab-stat-num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  line-height: 1;
  color: var(--ivory);
  display: block;
}

.page-about .ab-stat-label {
  display: block;
  color: var(--text-sub);
  font-size: 0.82rem;
  margin-top: 8px;
}

.page-about .ab-flow-list {
  list-style: none;
  counter-reset: flow;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .ab-flow-list li {
  counter-increment: flow;
  position: relative;
  padding: 20px 0 20px 48px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .ab-flow-list li:last-child {
  border-bottom: none;
}

.page-about .ab-flow-list li::before {
  content: counter(flow, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 22px;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.85rem;
  color: var(--red-dim);
  border: 1px solid var(--about-line);
}

.page-about .ab-flow-phase {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #8f6b35;
  margin-bottom: 6px;
}

.page-about .ab-flow-list h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.08rem;
  margin: 0 0 4px;
  color: var(--about-ink);
}

.page-about .ab-flow-list p {
  font-size: 0.92rem;
  margin: 0;
}

.page-about .ab-boundary-list {
  margin: 20px 0 0;
  padding-left: 20px;
}

.page-about .ab-boundary-list li {
  margin-bottom: 10px;
  font-size: 0.94rem;
  color: var(--about-ink-soft);
}

.page-about .ab-boundary-list li::marker {
  color: var(--red-dim);
}

.page-about .ab-contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 28px 0 0;
}

.page-about .ab-contact-item {
  border: 1px solid var(--line-soft);
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.02);
}

.page-about .ab-contact-item dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 6px;
}

.page-about .ab-contact-item dd {
  margin: 0;
  font-size: 1rem;
  color: var(--ivory);
  word-break: break-word;
}

.page-about .ab-contact-note {
  margin-top: 20px;
  border-left: 3px solid var(--line-gold);
  padding-left: 16px;
  font-size: 0.92rem;
  color: var(--text-sub);
}

.page-about .ab-contact-note p {
  margin-bottom: 8px;
}

.page-about .ab-season-axis {
  position: relative;
  display: flex;
  border-top: 1px solid var(--line-gold);
  margin-top: 30px;
}

.page-about .axis-node {
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 30px;
}

.page-about .axis-node::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 1px;
  height: 24px;
  background: var(--line-gold);
}

.page-about .axis-node-dot {
  position: relative;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--red-core);
  box-shadow: 0 0 0 3px var(--bg-dark);
}

.page-about .axis-node-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-sub);
  margin-top: 10px;
  opacity: 0.7;
  transition: opacity 0.2s ease, color 0.2s ease;
}

.page-about .axis-node:hover .axis-node-label,
.page-about .axis-node:focus-within .axis-node-label {
  opacity: 1;
  color: var(--gold);
}

@media (min-width: 768px) {
  .page-about .ab-cover {
    padding: 56px 0 72px;
  }

  .page-about .ab-cover-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 44px;
    margin-top: 28px;
  }

  .page-about .ab-chapter {
    padding: 76px 0;
  }

  .page-about h1 {
    font-size: clamp(2.6rem, 5vw, 4rem);
  }

  .page-about .ab-phrases {
    grid-template-columns: 1fr 1fr;
    gap: 12px 18px;
  }

  .page-about .ab-split--center,
  .page-about .ab-split--figure,
  .page-about .ab-split--two-col {
    display: grid;
    align-items: center;
    gap: 44px;
  }

  .page-about .ab-split--center {
    grid-template-columns: 1.08fr 0.92fr;
  }

  .page-about .ab-split--figure {
    grid-template-columns: 0.95fr 1.05fr;
  }

  .page-about .ab-split--two-col {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .page-about .ab-stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

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

  .page-about .ab-fig,
  .page-about .ab-pin-demo {
    margin-top: 0;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-cover {
    padding: 72px 0 96px;
  }

  .page-about .ab-chapter {
    padding: 96px 0;
  }

  .page-about .ab-cover-grid {
    gap: 64px;
  }

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