.page-about {
  --about-rail-w: 76px;
  --about-rail-gap: 48px;
  overflow-x: hidden;
  background-image:
    linear-gradient(to right, rgba(31, 58, 92, 0.22) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(31, 58, 92, 0.22) 1px, transparent 1px);
  background-size: 80px 80px;
  background-position: 0 0;
  padding-bottom: 72px;
}

.page-about .breadcrumb {
  padding: 18px 0 0;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--step-note);
  color: var(--c-mist);
}

.page-about .breadcrumb__list a {
  color: var(--c-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .breadcrumb__list a:hover,
.page-about .breadcrumb__list a:focus-visible {
  color: var(--c-gold);
  border-bottom-color: var(--c-gold);
}

.page-about .breadcrumb__sep {
  color: var(--c-line);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 34px;
  padding-top: 28px;
  border-top: 1px solid var(--c-line);
}

.page-about .about-hero__rail {
  display: none;
}

.page-about .about-hero__main {
  max-width: 62ch;
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--step-note);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--c-gold);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 6.4vw, 62px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--c-frost);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 38ch;
  font-size: var(--step-body);
  line-height: 1.85;
  color: var(--c-mist);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 24px;
  margin: 34px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--c-line);
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__stat-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1;
  color: var(--c-gold);
}

.page-about .about-hero__stat-label {
  font-size: var(--step-note);
  letter-spacing: 0.08em;
  color: var(--c-mist);
}

/* ---------- Section skeleton ---------- */
.page-about .about-section {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 56px;
  padding-top: 26px;
  border-top: 1px solid var(--c-line);
}

.page-about .about-section__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-mono);
}

.page-about .about-section__index {
  font-size: var(--step-note);
  color: var(--c-gold-deep);
  letter-spacing: 0.14em;
}

.page-about .about-section__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(19px, 3.4vw, 24px);
  font-weight: 400;
  line-height: 1.2;
  color: var(--c-frost);
}

.page-about .about-section__note {
  font-size: var(--step-note);
  letter-spacing: 0.2em;
  color: var(--c-neon);
}

.page-about .about-section__body {
  min-width: 0;
}

.page-about .about-lede {
  margin: 0 0 18px;
  max-width: 40ch;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.68;
  color: var(--c-frost);
}

.page-about .about-section__body .prose {
  margin: 0 0 16px;
  max-width: 38ch;
}

.page-about .about-section__body .prose a {
  color: var(--c-gold);
  text-decoration: none;
  border-bottom: 1px solid var(--c-gold-deep);
}

.page-about .about-section__body .prose a:hover,
.page-about .about-section__body .prose a:focus-visible {
  color: var(--c-glow);
  border-bottom-color: var(--c-glow);
}

/* ---------- Paper panel ---------- */
.page-about .about-paper {
  position: relative;
  margin-top: 26px;
  padding: 24px 22px;
  background:
    linear-gradient(160deg, rgba(14, 59, 51, 0.92) 0%, rgba(11, 18, 32, 0.96) 100%);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-s);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

.page-about .about-paper::before,
.page-about .about-paper::after {
  content: "";
  position: absolute;
  width: 14px;
  height: 14px;
  border: 1px solid var(--c-gold-deep);
  opacity: 0.7;
}

.page-about .about-paper::before {
  top: -1px;
  left: -1px;
  border-right: 0;
  border-bottom: 0;
}

.page-about .about-paper::after {
  bottom: -1px;
  right: -1px;
  border-left: 0;
  border-top: 0;
}

.page-about .about-paper--dark {
  background: linear-gradient(150deg, rgba(22, 35, 63, 0.9) 0%, rgba(11, 18, 32, 0.94) 100%);
}

.page-about .about-paper__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: var(--step-h4);
  font-weight: 400;
  color: var(--c-gold);
}

.page-about .about-paper__text {
  margin: 0 0 16px;
  max-width: 38ch;
  font-size: var(--step-body);
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .about-paper__text:last-child {
  margin-bottom: 0;
}

/* ---------- Figures ---------- */
.page-about .about-figure {
  margin: 0 0 28px;
}

.page-about .about-ver-figure {
  margin: 0 0 26px;
}

.page-about .about-crew-figure {
  margin: 0;
}

/* ---------- Steps ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-top: 1px solid var(--c-line);
  transition: background 0.3s var(--ease);
}

.page-about .about-steps__item:last-child {
  border-bottom: 1px solid var(--c-line);
}

.page-about .about-steps__item:hover,
.page-about .about-steps__item:focus-within {
  background: linear-gradient(90deg, rgba(20, 86, 74, 0.24) 0%, transparent 78%);
}

.page-about .about-steps__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 26px);
  line-height: 1.1;
  color: var(--c-neon);
  opacity: 0.85;
}

.page-about .about-steps__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--step-h4);
  font-weight: 400;
  color: var(--c-frost);
}

.page-about .about-steps__text {
  margin: 0;
  max-width: 38ch;
  font-size: var(--step-body);
  line-height: 1.8;
  color: var(--c-mist);
}

/* ---------- Crew map ---------- */
.page-about .about-crew-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  margin-bottom: 24px;
}

.page-about .crew-map__hub {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  background: rgba(20, 86, 74, 0.32);
  border: 1px solid var(--c-ink-light);
  border-left: 3px solid var(--c-gold);
}

.page-about .crew-map__num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 48px);
  line-height: 1;
  color: var(--c-gold);
}

.page-about .crew-map__hub-text {
  font-size: var(--step-note);
  letter-spacing: 0.16em;
  color: var(--c-mist);
}

.page-about .crew-map__branches {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-left: 1px solid var(--c-line);
}

.page-about .crew-map__branch {
  position: relative;
  padding: 18px 18px 18px 26px;
  border-bottom: 1px solid var(--c-line);
}

.page-about .crew-map__branch::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 30px;
  width: 16px;
  height: 1px;
  background: var(--c-gold-deep);
}

.page-about .crew-map__count {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--step-note);
  letter-spacing: 0.1em;
  color: var(--c-neon);
  border: 1px solid rgba(124, 242, 155, 0.45);
  padding: 1px 8px;
  margin-bottom: 8px;
}

.page-about .crew-map__role {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: var(--step-h4);
  font-weight: 400;
  color: var(--c-frost);
}

.page-about .crew-map__duty {
  margin: 0;
  max-width: 34ch;
  font-size: var(--step-body);
  line-height: 1.78;
  color: var(--c-mist);
}

/* ---------- Version timeline ---------- */
.page-about .ver-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 34px;
  display: grid;
  gap: 26px;
}

.page-about .ver-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-neon) 0%, var(--c-gold) 52%, var(--c-line) 100%);
}

.page-about .ver-timeline__item {
  position: relative;
  outline: none;
}

.page-about .ver-timeline__node {
  position: absolute;
  left: -34px;
  top: 6px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: var(--c-midnight);
  border: 2px solid var(--c-neon);
  box-shadow: 0 0 0 0 rgba(124, 242, 155, 0.5);
  transition: box-shadow 0.35s var(--ease), background 0.35s var(--ease);
}

.page-about .ver-timeline__item:hover .ver-timeline__node,
.page-about .ver-timeline__item:focus-visible .ver-timeline__node {
  background: var(--c-neon);
  box-shadow: 0 0 0 8px rgba(124, 242, 155, 0.16);
}

.page-about .ver-timeline__label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.2vw, 28px);
  line-height: 1.1;
  color: var(--c-gold);
  background: rgba(199, 123, 34, 0.18);
  border: 1px solid var(--c-gold-deep);
  padding: 2px 12px;
  margin-bottom: 12px;
}

.page-about .ver-timeline__card {
  padding: 4px 0 0;
  transition: transform 0.35s var(--ease);
}

.page-about .ver-timeline__item:hover .ver-timeline__card,
.page-about .ver-timeline__item:focus-visible .ver-timeline__card {
  transform: translateX(4px);
}

.page-about .ver-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: var(--step-h3);
  font-weight: 400;
  color: var(--c-frost);
}

.page-about .ver-timeline__text {
  margin: 0;
  max-width: 40ch;
  font-size: var(--step-body);
  line-height: 1.82;
  color: var(--c-mist);
}

/* ---------- Topic cloud ---------- */
.page-about .about-cloud__title {
  margin: 28px 0 14px;
  font-family: var(--font-display);
  font-size: var(--step-h4);
  font-weight: 400;
  color: var(--c-frost);
}

.page-about .topic-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .topic-cloud__item {
  font-size: var(--step-note);
  letter-spacing: 0.06em;
  color: var(--c-mist);
  padding: 7px 14px;
  border: 1px solid var(--c-line);
  border-radius: 999px;
  background: rgba(22, 35, 63, 0.5);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), transform 0.25s var(--ease);
  cursor: default;
}

.page-about .topic-cloud__item:hover,
.page-about .topic-cloud__item:focus-visible {
  transform: translateY(-2px);
  color: var(--c-frost);
  border-color: var(--c-gold);
}

.page-about .topic-cloud__item--gold {
  color: var(--c-gold);
  border-color: rgba(199, 123, 34, 0.7);
  background: rgba(199, 123, 34, 0.12);
}

.page-about .topic-cloud__item--neon {
  color: var(--c-neon);
  border-color: rgba(124, 242, 155, 0.45);
  background: rgba(124, 242, 155, 0.08);
}

/* ---------- CTA ---------- */
.page-about .about-cta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 64px;
  padding: 32px 22px;
  border: 1px solid var(--c-line);
  border-top: 2px solid var(--c-gold);
  background:
    radial-gradient(120% 140% at 8% 0%, rgba(240, 166, 60, 0.16) 0%, transparent 58%),
    linear-gradient(180deg, rgba(14, 59, 51, 0.42) 0%, rgba(11, 18, 32, 0.9) 100%);
}

.page-about .about-cta__index {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--step-note);
  letter-spacing: 0.28em;
  color: var(--c-neon);
  margin-bottom: 12px;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 4vw, 32px);
  font-weight: 400;
  line-height: 1.26;
  color: var(--c-frost);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 40ch;
  font-size: var(--step-body);
  line-height: 1.8;
  color: var(--c-mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ---------- Desktop ---------- */
@media (min-width: 900px) {
  .page-about {
    padding-bottom: 104px;
  }

  .page-about .about-hero {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-rail-gap);
    margin-top: 44px;
    padding-top: 38px;
  }

  .page-about .about-hero__rail {
    display: flex;
    align-items: flex-start;
    gap: 18px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-family: var(--font-mono);
    font-size: var(--step-note);
    letter-spacing: 0.32em;
    color: var(--c-mist);
    padding-top: 4px;
  }

  .page-about .about-hero__rail-text {
    white-space: nowrap;
  }

  .page-about .about-hero__rail-tick {
    display: block;
    width: 1px;
    height: 88px;
    background: linear-gradient(180deg, var(--c-gold), transparent);
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-section {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: var(--about-rail-gap);
    margin-top: 88px;
    padding-top: 38px;
  }

  .page-about .about-section__rail {
    position: sticky;
    top: 132px;
    align-self: start;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    align-items: center;
    gap: 20px;
    padding-bottom: 6px;
    font-family: var(--font-mono);
  }

  .page-about .about-section__title {
    font-size: 20px;
    letter-spacing: 0.08em;
    white-space: nowrap;
  }

  .page-about .about-section__note {
    color: var(--c-neon);
    letter-spacing: 0.36em;
  }

  .page-about .about-section__body {
    max-width: 74ch;
  }

  .page-about .about-crew-layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
    gap: 34px;
  }

  .page-about .about-steps__item {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 20px;
    padding: 24px 0;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 32px;
    margin-top: 96px;
    padding: 44px 40px;
  }

  .page-about .about-cta__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-steps__item,
  .page-about .ver-timeline__node,
  .page-about .ver-timeline__card,
  .page-about .topic-cloud__item {
    transition: none;
  }

  .page-about .ver-timeline__item:hover .ver-timeline__card,
  .page-about .ver-timeline__item:focus-visible .ver-timeline__card {
    transform: none;
  }
}