.page-about {
  background: var(--ink);
  color: var(--silver);
}

.page-about .ab-hero {
  position: relative;
  padding: 22px 0 0;
  background:
    radial-gradient(92% 82% at 88% 0%, rgba(36, 27, 74, 0.92), rgba(36, 27, 74, 0) 62%),
    linear-gradient(180deg, #0A1826 0%, #0C1E31 54%, #102A3E 100%);
  border-bottom: 1px solid var(--hair);
}

.page-about .ab-hero .crumbs {
  margin-bottom: 20px;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: 24px;
}

.page-about .ab-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 6.4vw, 52px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 10px 0 14px;
  color: var(--silver);
  text-wrap: balance;
}

.page-about .ab-hero__title em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .ab-hero__lead {
  max-width: 36em;
  color: var(--silver);
}

.page-about .ab-hero__figure {
  margin: 0;
}

.page-about .ab-hero__figure .media-frame__caption {
  margin-top: 8px;
}

.page-about .ab-axis {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hair);
  border-top: 1px solid var(--hair);
}

.page-about .ab-axis__item {
  position: relative;
  background: rgba(10, 24, 38, 0.72);
  padding: 14px 14px 20px;
}

.page-about .ab-axis__item::after {
  content: "";
  position: absolute;
  left: 14px;
  bottom: 11px;
  width: 26px;
  height: 3px;
  background: var(--cyan);
}

.page-about .ab-axis__v {
  display: block;
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .ab-axis__t {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .ab-body {
  display: grid;
  gap: 26px;
  padding-top: 38px;
  padding-bottom: 56px;
}

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

.page-about .ab-rail__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
}

.page-about .ab-rail__item {
  flex: 0 0 auto;
}

.page-about .ab-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 2px solid rgba(196, 211, 223, 0.28);
  color: var(--mist);
  text-decoration: none;
  font-size: 13px;
  white-space: nowrap;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

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

.page-about .ab-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

@media (max-width: 899px) {
  .page-about .ab-rail__link:hover,
  .page-about .ab-rail__link:focus-visible {
    color: var(--cyan);
    border-color: var(--cyan);
  }
}

.page-about .ab-flow {
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-width: 0;
}

.page-about .ab-block {
  position: relative;
  min-width: 0;
  padding: 24px 20px 26px;
  background: var(--panel);
  border: 3px solid rgba(196, 211, 223, 0.3);
  box-shadow: var(--shadow);
  scroll-margin-top: 76px;
  transition: transform 0.18s var(--ease), box-shadow 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .ab-block:hover,
.page-about .ab-block:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
  border-color: var(--cyan);
}

.page-about .ab-block--steel {
  background: var(--steel);
}

.page-about .ab-block--violet {
  background: linear-gradient(162deg, var(--violet) 0%, #1A1436 58%, var(--panel) 100%);
}

.page-about .ab-block__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .ab-block__num {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .ab-block h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 4.2vw, 30px);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--silver);
}

.page-about .ab-block p {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(232, 239, 245, 0.86);
  max-width: 38em;
}

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

.page-about .ab-inline {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-vers {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .ab-vers__item {
  padding: 4px 0 4px 16px;
  border-left: 2px solid rgba(0, 227, 206, 0.38);
}

.page-about .ab-vers__v {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .ab-vers__h {
  margin: 4px 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--silver);
}

.page-about .ab-vers__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
}

.page-about .ab-figure {
  margin: 22px 0 0;
}

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

.page-about .ab-figure .media-frame__caption {
  margin-top: 8px;
}

.page-about .ab-quote {
  margin: 18px 0;
  padding: 2px 0 2px 16px;
  border-left: 3px solid var(--cyan);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 3.6vw, 26px);
  line-height: 1.36;
  letter-spacing: -0.02em;
  color: var(--silver);
  max-width: 26em;
}

.page-about .ab-checks {
  list-style: none;
  margin: 16px 0 18px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .ab-checks li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  align-items: start;
}

.page-about .ab-checks__n {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
  padding-top: 4px;
}

.page-about .ab-checks__t {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(232, 239, 245, 0.86);
}

.page-about .ab-checks__t strong {
  display: block;
  margin-bottom: 2px;
  font-weight: 700;
  color: var(--silver);
}

.page-about .ab-tiers {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
}

.page-about .ab-tier {
  padding: 12px 14px;
  border: 2px solid rgba(196, 211, 223, 0.28);
  background: rgba(10, 24, 38, 0.5);
}

.page-about .ab-tier__k {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
}

.page-about .ab-tier--ok .ab-tier__k {
  color: var(--cyan);
}

.page-about .ab-tier--warn .ab-tier__k {
  color: var(--orange);
}

.page-about .ab-tier--no .ab-tier__k {
  color: var(--mist);
}

.page-about .ab-tier p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
}

.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 18px 0;
  background: rgba(196, 211, 223, 0.2);
}

.page-about .ab-stats__item {
  padding: 14px 12px;
  background: rgba(10, 24, 38, 0.55);
}

.page-about .ab-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 4vw, 28px);
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .ab-stats__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .ab-next {
  display: grid;
  gap: 12px;
  margin: 18px 0 0;
}

.page-about .ab-next__card {
  display: block;
  padding: 16px 16px 18px;
  text-decoration: none;
  color: var(--silver);
  border: 3px solid rgba(196, 211, 223, 0.3);
  background: rgba(10, 24, 38, 0.5);
  transition: transform 0.18s var(--ease), border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.page-about .ab-next__card:hover,
.page-about .ab-next__card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--cyan);
  box-shadow: var(--shadow);
}

.page-about .ab-next__k {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .ab-next__t {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.page-about .ab-next__d {
  display: block;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .ab-footline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--hair);
}

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

@media (min-width: 640px) {
  .page-about .ab-tiers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

@media (min-width: 720px) {
  .page-about .ab-axis {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .ab-block {
    padding: 30px 28px 32px;
  }
}

@media (min-width: 860px) {
  .page-about .ab-hero {
    padding-top: 28px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: end;
    gap: 40px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-body {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 44px;
    padding-top: 52px;
    padding-bottom: 80px;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 28px;
    align-self: start;
  }

  .page-about .ab-rail__list {
    display: block;
    overflow: visible;
    padding: 0;
    border-left: 2px solid var(--hair);
  }

  .page-about .ab-rail__item + .ab-rail__item {
    margin-top: 2px;
  }

  .page-about .ab-rail__link {
    position: relative;
    display: flex;
    padding: 10px 0 10px 18px;
    border: 0;
    font-size: 14px;
    white-space: normal;
    background: transparent;
  }

  .page-about .ab-rail__dot {
    display: block;
    position: absolute;
    left: -7px;
    top: 14px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--ink);
    border: 2px solid var(--line);
    transition: background 0.18s var(--ease), border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
  }

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

  .page-about .ab-rail__link:hover .ab-rail__dot,
  .page-about .ab-rail__link:focus-visible .ab-rail__dot {
    background: var(--cyan);
    border-color: var(--cyan);
    box-shadow: 0 0 0 4px rgba(0, 227, 206, 0.16);
  }

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