.page-about {
  --ab-rail: 13rem;
  --ab-radius: 4px;
  display: block;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: clip;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

/* ---------- Hero ---------- */

.page-about .ab-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  padding-block: clamp(1.6rem, 4.5vw, 2.75rem) clamp(2.5rem, 7vw, 5rem);
}

.page-about .ab-hero__texture {
  position: absolute;
  inset: 0;
  z-index: -1;
  display: block;
  pointer-events: none;
  background:
    radial-gradient(60% 70% at 12% 8%, rgba(217, 165, 33, 0.2), transparent 60%),
    radial-gradient(55% 65% at 92% 88%, rgba(208, 30, 40, 0.3), transparent 62%),
    repeating-linear-gradient(135deg, rgba(247, 245, 241, 0.055) 0 1px, transparent 1px 13px);
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .ab-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin: 0 0 clamp(1.5rem, 4vw, 2.75rem);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--paper-70);
}

.page-about .ab-crumbs a {
  color: var(--paper-70);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-crumbs a:hover,
.page-about .ab-crumbs a:focus-visible {
  color: var(--gold-light);
  border-bottom-color: var(--gold-30);
}

.page-about .ab-crumbs__sep {
  color: var(--paper-70);
  opacity: 0.6;
}

.page-about .ab-crumbs__current {
  color: var(--gold);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(1.75rem, 5vw, 3rem);
}

.page-about .ab-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 1rem;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .ab-kicker::before {
  content: "";
  display: block;
  width: 2.25rem;
  height: 2px;
  background: linear-gradient(90deg, var(--red), var(--gold));
}

.page-about .ab-title {
  margin: 0 0 1.1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 5.6vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--paper);
  text-wrap: balance;
  transform: skewX(-1.4deg);
}

.page-about .ab-title strong {
  display: inline-block;
  font-weight: 900;
  color: var(--gold);
  text-shadow: 0 0 0 transparent;
}

.page-about .ab-lede {
  max-width: 48ch;
  margin: 0 0 1.75rem;
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.85;
  color: var(--paper-70);
}

.page-about .ab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.page-about .ab-hero .btn--ghost {
  color: var(--paper);
  border-color: rgba(247, 245, 241, 0.3);
}

.page-about .ab-hero .btn--ghost:hover,
.page-about .ab-hero .btn--ghost:focus-visible {
  border-color: var(--gold);
  color: var(--gold-light);
}

/* ---------- Ledger ---------- */

.page-about .ab-ledger {
  position: relative;
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background: rgba(247, 245, 241, 0.05);
  border: 1px solid rgba(247, 245, 241, 0.14);
  border-radius: 6px;
  box-shadow: var(--shadow-2);
}

.page-about .ab-ledger__title {
  margin: 0 0 1rem;
  padding-bottom: 0.75rem;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
  border-bottom: 1px solid rgba(247, 245, 241, 0.14);
}

.page-about .ab-ledger__list {
  display: grid;
  gap: 0.85rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-ledger__item {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}

.page-about .ab-ledger__num {
  flex: 0 0 auto;
  min-width: 3.2ch;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.3rem, 3vw, 1.7rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-ledger__label {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--paper-70);
}

/* ---------- Layout ---------- */

.page-about .ab-layout {
  display: grid;
  gap: clamp(1.25rem, 3.5vw, 2.5rem);
  align-items: start;
  padding-block: clamp(2rem, 5vw, 4rem);
}

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

/* ---------- Rail ---------- */

.page-about .ab-rail {
  position: sticky;
  top: 0;
  z-index: 6;
  padding: 0.55rem 0;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-rail__caption {
  display: none;
}

.page-about .ab-rail__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.15rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .ab-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .ab-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  white-space: nowrap;
  font-size: 0.8125rem;
  color: var(--slate);
  text-decoration: none;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 999px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .ab-rail__no {
  display: none;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--line);
}

.page-about .ab-rail__link:hover,
.page-about .ab-rail__link:focus-visible {
  color: var(--ink);
  border-color: var(--gold);
  background: var(--paper-2);
}

/* ---------- Blocks ---------- */

.page-about .ab-block {
  padding-block: clamp(1.9rem, 4.5vw, 3.25rem);
  border-top: 1px solid var(--line);
  scroll-margin-top: 4.5rem;
}

.page-about .ab-block:first-child {
  padding-top: 0.5rem;
  border-top: 0;
}

.page-about .ab-index {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0 0 0.75rem;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .ab-index__num {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0;
  color: var(--red);
}

.page-about .ab-index::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(90deg, var(--line), transparent);
}

.page-about .ab-h2 {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-wrap: balance;
}

.page-about .ab-copy {
  max-width: 64ch;
}

.page-about .ab-copy p {
  margin: 0 0 1.1em;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .ab-copy p:last-child {
  margin-bottom: 0;
}

.page-about .ab-copy a {
  color: var(--red);
  text-decoration: none;
  border-bottom: 1px solid var(--gold-30);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .ab-copy a:hover,
.page-about .ab-copy a:focus-visible {
  color: var(--red-deep);
  border-bottom-color: var(--red);
}

/* ---------- Strip ---------- */

.page-about .ab-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
  gap: 1px;
  margin-top: clamp(1.4rem, 3vw, 2.1rem);
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  overflow: hidden;
}

.page-about .ab-strip__item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.05rem 1.15rem;
  background: var(--paper-2);
}

.page-about .ab-strip__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 1.95rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--red);
}

.page-about .ab-strip__text {
  font-size: 0.8125rem;
  line-height: 1.55;
  color: var(--slate);
}

/* ---------- Lanes ---------- */

.page-about .ab-lanes {
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.4rem, 3vw, 2.1rem);
}

.page-about .ab-lane {
  padding: 1.25rem 1.25rem 1.4rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--lane-accent, var(--red));
  border-radius: var(--ab-radius);
  box-shadow: var(--shadow-1);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .ab-lane--red { --lane-accent: var(--red); }
.page-about .ab-lane--blue { --lane-accent: var(--ink-blue); }
.page-about .ab-lane--green { --lane-accent: var(--grass); }

.page-about .ab-lane:hover,
.page-about .ab-lane:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
}

.page-about .ab-lane__badge {
  margin: 0 0 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--lane-accent, var(--red));
}

.page-about .ab-lane h3 {
  margin: 0 0 0.55rem;
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-lane p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--slate);
}

/* ---------- Roles ---------- */

.page-about .ab-roles {
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.4rem, 3vw, 2.1rem);
}

.page-about .ab-role {
  padding: 1.35rem 1.3rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  box-shadow: var(--shadow-1);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-role--a { padding-block: 1.6rem 1.25rem; }
.page-about .ab-role--b { padding-block: 1.15rem 1.55rem; }
.page-about .ab-role--c { padding-block: 1.45rem 1.35rem; }

.page-about .ab-role:hover,
.page-about .ab-role:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  border-color: var(--gold-30);
}

.page-about .ab-role__tag {
  display: inline-block;
  margin: 0 0 0.75rem;
  padding: 0.2rem 0.5rem;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 2px;
}

.page-about .ab-role h3 {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-role p {
  margin: 0 0 0.7rem;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .ab-role .ab-role__note {
  margin: 0;
  padding-top: 0.7rem;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--ink);
  border-top: 1px dashed var(--line);
}

/* ---------- Figures ---------- */

.page-about .ab-figure {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: clamp(1.4rem, 3vw, 2.1rem) 0 0;
  padding: clamp(0.9rem, 3vw, 1.75rem);
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  overflow: hidden;
}

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

.page-about .ab-figure--square img {
  max-width: min(30rem, 100%);
}

.page-about .ab-role-figure {
  grid-column: 1 / -1;
  margin-top: 0;
}

/* ---------- Steps ---------- */

.page-about .ab-steps {
  display: grid;
  gap: 1rem;
  margin: clamp(1.4rem, 3vw, 2.1rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-step {
  padding: 1.1rem 1.15rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--red);
  border-radius: var(--ab-radius);
}

.page-about .ab-step__num {
  display: block;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--red);
}

.page-about .ab-step h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-step p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--slate);
}

.page-about .ab-callouts {
  display: grid;
  gap: 0.7rem;
  margin-top: 1.15rem;
}

.page-about .ab-callout {
  margin: 0;
  padding: 0.9rem 1.05rem;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--slate);
  background: var(--paper-2);
  border-left: 2px solid var(--gold);
  border-radius: 0 var(--ab-radius) var(--ab-radius) 0;
}

/* ---------- Versions ---------- */

.page-about .ab-versions {
  display: grid;
  gap: 0.9rem;
  margin-top: clamp(1.4rem, 3vw, 2.1rem);
}

.page-about .ab-version {
  padding: 1.15rem 1.2rem 1.3rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
  box-shadow: var(--shadow-1);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .ab-version:hover,
.page-about .ab-version:focus-within {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  border-color: var(--gold-30);
}

.page-about .ab-version__tag {
  display: inline-block;
  margin: 0 0 0.7rem;
  padding: 0.18rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--paper);
  background: linear-gradient(120deg, var(--red), var(--red-deep));
  border-radius: 2px;
}

.page-about .ab-version--now .ab-version__tag {
  color: var(--ink);
  background: linear-gradient(120deg, var(--gold), var(--gold-light));
}

.page-about .ab-version h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-version p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--slate);
}

/* ---------- Feedback ---------- */

.page-about .ab-feedback {
  display: grid;
  gap: 0.9rem;
  margin-top: clamp(1.4rem, 3vw, 2.1rem);
}

.page-about .ab-feedback__card {
  padding: 1.15rem 1.2rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--ab-radius);
}

.page-about .ab-feedback__card h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .ab-feedback__card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--slate);
}

/* ---------- CTA ---------- */

.page-about .ab-cta {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: grid;
  gap: 1.25rem;
  margin-top: clamp(1.6rem, 3.5vw, 2.4rem);
  padding: clamp(1.35rem, 4vw, 2.25rem);
  background: var(--ink);
  color: var(--paper);
  border-radius: 6px;
  box-shadow: var(--shadow-3);
}

.page-about .ab-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(70% 90% at 88% 10%, rgba(208, 30, 40, 0.28), transparent 68%),
    repeating-linear-gradient(135deg, rgba(247, 245, 241, 0.05) 0 1px, transparent 1px 14px);
}

.page-about .ab-cta__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.15rem, 2.4vw, 1.5rem);
  line-height: 1.3;
  color: var(--paper);
}

.page-about .ab-cta__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--paper-70);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.page-about .ab-cta .btn--ghost {
  color: var(--paper);
  border-color: rgba(247, 245, 241, 0.32);
}

.page-about .ab-cta .btn--ghost:hover,
.page-about .ab-cta .btn--ghost:focus-visible {
  border-color: var(--gold);
  color: var(--gold-light);
}

/* ---------- Reveal ---------- */

.page-about [data-reveal] {
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

/* ---------- Responsive ---------- */

@media (min-width: 48rem) {
  .page-about .ab-copy p {
    font-size: 1.0625rem;
  }

  .page-about .ab-lanes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-callouts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-feedback {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1.5fr) minmax(13rem, 0.9fr);
    align-items: center;
    gap: 1.75rem;
  }
}

@media (min-width: 62rem) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(17rem, 0.92fr);
    align-items: end;
  }

  .page-about .ab-versions {
    grid-auto-flow: column;
    grid-auto-columns: minmax(14.5rem, 1fr);
    gap: 1rem;
    overflow-x: auto;
    padding-bottom: 0.85rem;
    scroll-snap-type: x proximity;
    scrollbar-width: thin;
  }

  .page-about .ab-versions::-webkit-scrollbar {
    height: 6px;
  }

  .page-about .ab-versions::-webkit-scrollbar-thumb {
    background: var(--line);
    border-radius: 3px;
  }

  .page-about .ab-version {
    scroll-snap-align: start;
  }
}

@media (min-width: 64rem) {
  .page-about .ab-layout {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .ab-rail {
    position: sticky;
    top: 3rem;
    z-index: auto;
    padding: 0;
    background: transparent;
    border-bottom: 0;
  }

  .page-about .ab-rail__caption {
    display: block;
    margin: 0 0 0.9rem;
    padding-bottom: 0.6rem;
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--slate);
    border-bottom: 1px solid var(--line);
  }

  .page-about .ab-rail__list {
    display: grid;
    gap: 0.05rem;
    overflow: visible;
    padding: 0;
  }

  .page-about .ab-rail__link {
    display: flex;
    padding: 0.5rem 0.5rem 0.5rem 0.85rem;
    white-space: normal;
    font-size: 0.875rem;
    background: transparent;
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
  }

  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link:focus-visible {
    background: var(--ink-06);
    border-left-color: var(--gold);
  }

  .page-about .ab-rail__no {
    display: inline;
  }

  .page-about .ab-rail__link:hover .ab-rail__no,
  .page-about .ab-rail__link:focus-visible .ab-rail__no {
    color: var(--red);
  }

  .page-about .ab-block {
    scroll-margin-top: 2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms;
    animation-duration: 0.01ms;
    animation-iteration-count: 1;
  }

  .page-about .ab-lane:hover,
  .page-about .ab-lane:focus-within,
  .page-about .ab-role:hover,
  .page-about .ab-role:focus-within,
  .page-about .ab-version:hover,
  .page-about .ab-version:focus-within {
    transform: none;
  }
}