.page-about {
  --ab-rail-w: 216px;
  --ab-card: #FFFDF7;
  --ab-shadow: 0 1px 2px rgba(11, 15, 14, 0.06), 0 8px 24px rgba(11, 15, 14, 0.05);
  background: var(--paper);
  color: var(--ink-text);
  overflow-x: hidden;
}

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 5vw, 56px) 0 clamp(36px, 6vw, 76px);
  background: radial-gradient(120% 90% at 82% 0%, #12211C 0%, var(--ink) 58%);
  color: var(--paper);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(46, 58, 53, 0.6) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(46, 58, 53, 0.6) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.45;
  pointer-events: none;
}

.page-about .ab-hero__ghost {
  position: absolute;
  right: -0.04em;
  bottom: -0.22em;
  font-size: clamp(120px, 26vw, 300px);
  font-weight: 200;
  line-height: 1;
  letter-spacing: -0.04em;
  color: rgba(0, 229, 160, 0.07);
  pointer-events: none;
  user-select: none;
}

.page-about .ab-hero__frame {
  position: relative;
  z-index: 1;
  padding: clamp(18px, 3.4vw, 40px);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: rgba(27, 35, 32, 0.42);
  box-shadow: inset 0 0 0 1px rgba(246, 242, 233, 0.03);
}

.page-about .ab-hero__crumbs .breadcrumbs__link {
  color: var(--muted);
}

.page-about .ab-hero__crumbs .breadcrumbs__link:hover {
  color: var(--mint);
}

.page-about .ab-hero__crumbs .breadcrumbs__current {
  color: var(--paper-2);
}

.page-about .ab-hero__tag {
  margin: clamp(18px, 3vw, 30px) 0 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mint);
}

.page-about .ab-hero__title {
  margin: 12px 0 0;
  max-width: 20ch;
  font-size: clamp(30px, 6vw, 64px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .ab-hero__lede {
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
  color: var(--paper-2);
}

.page-about .ab-hero__facts {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}

.page-about .ab-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  background: var(--ink-soft);
}

.page-about .ab-hero__k {
  font-size: 11px;
  letter-spacing: 0.13em;
  color: var(--muted);
}

.page-about .ab-hero__v {
  font-size: 14px;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .ab-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 48px);
  padding-block: clamp(28px, 5vw, 64px) clamp(48px, 7vw, 96px);
}

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

.page-about .ab-rail__label {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mint-deep);
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line-soft);
}

.page-about .ab-rail__item {
  position: relative;
}

.page-about .ab-rail__item::before {
  content: "";
  position: absolute;
  left: -3.5px;
  top: 15px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--line-soft);
  transition: background 0.2s ease, transform 0.2s ease;
}

.page-about .ab-rail__link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 8px 0 8px 16px;
  font-size: 14px;
  color: var(--ink-text);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .ab-rail__link .mono {
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.08em;
}

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

.page-about .ab-rail__item:hover::before {
  background: var(--mint);
  transform: scale(1.3);
}

.page-about .ab-rail__foot {
  margin: 20px 0 0;
  padding-left: 16px;
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--muted);
}

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

.page-about .ab-sec {
  padding-block: clamp(26px, 4vw, 44px);
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .ab-sec__title {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin: 0;
  font-size: clamp(21px, 3.1vw, 30px);
  font-weight: 600;
  line-height: 1.32;
  letter-spacing: -0.005em;
  color: var(--ink);
}

.page-about .ab-sec__num {
  font-size: clamp(12px, 1.4vw, 14px);
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--mint-deep);
}

.page-about .ab-sec__lede {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 16px);
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .ab-sec__lede a,
.page-about .ab-service__col a {
  color: var(--mint-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .ab-sec__lede a:hover,
.page-about .ab-service__col a:hover {
  color: var(--ink);
}

.page-about .ab-prose p {
  margin: 16px 0 0;
  max-width: 68ch;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.82;
  color: var(--graphite);
}

.page-about .ab-prose p:first-child {
  margin-top: 18px;
}

.page-about .ab-figure {
  margin: clamp(22px, 3.4vw, 34px) 0 0;
}

.page-about .ab-figure img {
  max-width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .ab-figure__cap {
  margin: 10px 0 0;
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.page-about .ab-steps {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--ab-shadow);
}

.page-about .ab-step {
  padding: 20px 18px 22px;
  background: var(--ab-card);
}

.page-about .ab-step__num {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mint-deep);
}

.page-about .ab-step__name {
  margin: 8px 0 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .ab-step__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--graphite);
}

.page-about .ab-phases {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.6vw, 26px);
}

.page-about .ab-phase {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  padding-left: 16px;
  border-left: 2px solid var(--line-soft);
}

.page-about .ab-phase__num {
  align-self: start;
  justify-self: start;
  padding: 5px 11px;
  border-radius: 6px;
  background: var(--ink);
  color: var(--mint);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.page-about .ab-phase__title {
  margin: 0;
  font-size: clamp(17px, 2.2vw, 20px);
  font-weight: 600;
  color: var(--ink);
}

.page-about .ab-phase__body p {
  margin: 8px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--graphite);
}

.page-about .ab-roles {
  margin: 22px 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .ab-role {
  padding: 18px 18px 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
  background: var(--ab-card);
  box-shadow: var(--ab-shadow);
}

.page-about .ab-role__name {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .ab-role__desc {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--graphite);
}

.page-about .ab-role__out {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mint-deep);
}

.page-about .ab-note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 68ch;
  padding: 16px 18px;
  border-left: 2px solid var(--mint);
  background: rgba(184, 255, 232, 0.24);
  border-radius: 0 10px 10px 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-text);
}

.page-about .ab-rules {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-rule {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-rule__k {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber-deep);
}

.page-about .ab-rule__v {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .ab-service {
  margin: 22px 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .ab-service__col {
  padding: 20px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
  background: var(--ab-card);
}

.page-about .ab-service__title {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .ab-service__col p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .ab-cta {
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: clamp(20px, 3.4vw, 34px);
  display: flex;
  flex-direction: column;
  gap: 20px;
  background: var(--ink);
  border: 1px solid var(--line);
}

.page-about .ab-cta__tag {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mint);
}

.page-about .ab-cta__title {
  margin: 10px 0 0;
  font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 600;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .ab-cta__desc {
  margin: 10px 0 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--paper-2);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 720px) {
  .page-about .ab-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .ab-cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .ab-cta__actions {
    flex-shrink: 0;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-phase {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 22px;
    padding-left: 22px;
  }

  .page-about .ab-rule {
    grid-template-columns: 148px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }

  .page-about .ab-rule__k {
    padding-top: 4px;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-shell {
    grid-template-columns: var(--ab-rail-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-rail {
    display: block;
    position: sticky;
    top: 96px;
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-rail__item::before,
  .page-about .ab-rail__link {
    transition: none;
  }
}