.page-about {
  --about-measure: 62ch;
  background-color: var(--vault-black);
  background-image:
    linear-gradient(rgba(42, 44, 49, 0.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 44, 49, 0.18) 1px, transparent 1px);
  background-size: 72px 72px;
  color: var(--ink);
  overflow-x: clip;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(28px, 5vw, 56px);
  color: var(--ink-2);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .breadcrumbs a {
  color: var(--ink-2);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  color: var(--crown);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--white);
}

.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 6vw, 64px) 0 clamp(72px, 10vw, 128px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 82% 18%, rgba(201, 162, 39, 0.13), transparent 36%),
    radial-gradient(circle at 12% 84%, rgba(47, 224, 208, 0.05), transparent 28%);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: clamp(32px, 6vw, 64px);
  align-items: end;
}

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

.page-about .display {
  max-width: 12em;
  margin: 12px 0 24px;
  font-family: var(--font-display);
  font-size: clamp(2.9rem, 10vw, 7.4rem);
  font-weight: 800;
  line-height: 0.92;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero__lead {
  max-width: var(--about-measure);
  margin: 0 0 28px;
  color: var(--ink-2);
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.85;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-meta-item {
  display: flex;
  flex-direction: column;
  min-width: 96px;
  gap: 4px;
}

.page-about .about-meta-value {
  color: var(--crown);
  font-family: var(--font-mono);
  font-size: 20px;
}

.page-about .about-meta-label {
  color: var(--ink-2);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-hero__figure {
  min-width: 0;
  margin: 0;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(201, 162, 39, 0.16), rgba(11, 11, 13, 0.9) 45%, rgba(47, 224, 208, 0.06));
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  filter: saturate(0.8) contrast(1.05);
}

.page-about .about-chapter {
  position: relative;
  padding-block: clamp(64px, 12vw, 160px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter__grid {
  display: grid;
  gap: 20px;
}

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

.page-about .about-chapter__rail .chapter__number {
  display: inline-block;
  padding-left: 10px;
  border-left: 1px solid var(--gold-line);
  color: var(--crown);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
}

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

.page-about .section-head {
  display: grid;
  gap: 12px;
  margin-bottom: clamp(32px, 6vw, 56px);
}

.page-about .eyebrow {
  margin: 0;
  color: var(--crown);
  font-family: var(--font-serif);
  font-size: 13px;
  font-style: italic;
  letter-spacing: 0.08em;
}

.page-about .section-title {
  margin: 0;
  color: var(--white);
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4.4vw, 3rem);
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: 0.01em;
}

.page-about .about-lead {
  max-width: var(--about-measure);
  margin: 0 0 1.2em;
  color: var(--ink-2);
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.85;
}

.page-about .principle-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .principle {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 8px 16px;
  padding: clamp(24px, 4vw, 40px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .principle__num {
  padding-top: 4px;
  color: var(--crown);
  font-family: var(--font-mono);
  font-size: 14px;
}

.page-about .principle__title {
  grid-column: 2;
  margin: 0;
  color: var(--white);
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.12;
}

.page-about .principle__text {
  grid-column: 2;
  max-width: var(--about-measure);
  margin: 0;
  color: var(--ink-2);
  line-height: 1.85;
}

.page-about .entry-layout {
  display: grid;
  gap: clamp(32px, 5vw, 56px);
  margin-top: 32px;
}

.page-about .entry-order {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .entry-order__item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .entry-order__item--signal {
  padding-left: 16px;
  border-left: 2px solid var(--amber);
  background: linear-gradient(90deg, rgba(255, 138, 30, 0.08), transparent 70%);
}

.page-about .entry-order__slot {
  padding-top: 4px;
  color: var(--crown);
  font-family: var(--font-mono);
  font-size: 13px;
}

.page-about .entry-order__item--signal .entry-order__slot {
  color: var(--amber);
}

.page-about .entry-order__label {
  margin: 0 0 4px;
  color: var(--white);
  font-size: 18px;
  font-weight: 600;
}

.page-about .entry-order__note {
  margin: 0;
  color: var(--ink-2);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .entry-quote {
  align-self: start;
  margin: 0;
  padding: 24px 0 24px 24px;
  border-left: 1px solid var(--crown);
}

.page-about .entry-quote p {
  margin: 0 0 10px;
  color: var(--white);
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-style: italic;
  line-height: 1.3;
}

.page-about .entry-quote span {
  color: var(--ink-2);
  font-size: 14px;
}

.page-about .about-chapter--timeline {
  border-block: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(18, 19, 23, 0.25), rgba(18, 19, 23, 0.8));
}

.page-about .timeline-layout {
  display: grid;
  gap: 40px;
}

.page-about .timeline-figure {
  min-width: 0;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--deep-black);
}

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

.page-about .timeline {
  position: relative;
  min-width: 0;
  padding-left: 28px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 7px;
  width: 1px;
  background: linear-gradient(var(--gold-line), var(--crown), var(--gold-line));
}

.page-about .timeline-node {
  position: relative;
  padding: 0 0 32px;
  outline: none;
}

.page-about .timeline-node:last-child {
  padding-bottom: 0;
}

.page-about .timeline-node__dot {
  position: absolute;
  top: 6px;
  left: -25px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--crown);
  background: var(--vault-black);
  transform: rotate(45deg);
}

.page-about .timeline-node__version {
  display: block;
  margin-bottom: 6px;
  color: var(--crown);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
}

.page-about .timeline-node__title {
  margin: 0 0 6px;
  color: var(--white);
  font-size: 19px;
  line-height: 1.35;
}

.page-about .timeline-node__text {
  max-width: 56ch;
  margin: 0;
  color: var(--ink-2);
  line-height: 1.75;
}

.page-about .timeline-node__extra {
  max-height: none;
  max-width: 56ch;
  margin-top: 8px;
  overflow: hidden;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.7;
  opacity: 1;
}

.page-about .timeline-node:focus-visible {
  outline: 1px solid var(--amber);
  outline-offset: 6px;
}

.page-about .service-layout {
  display: grid;
  gap: 40px;
}

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

.page-about .service-copy p {
  max-width: var(--about-measure);
  color: var(--ink-2);
  line-height: 1.85;
}

.page-about .service-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 32px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-about .service-fact {
  min-width: 0;
  padding: 18px;
  background: var(--deep-black);
}

.page-about .service-fact__value {
  display: block;
  margin-bottom: 6px;
  color: var(--crown);
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.page-about .service-fact__label {
  color: var(--ink-2);
  font-size: 13px;
}

.page-about .service-aside {
  min-width: 0;
  align-self: start;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--deep-black);
}

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

.page-about .coverage-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 32px 0;
  border-block: 1px solid var(--line);
  background: var(--line);
}

.page-about .coverage-stat {
  min-width: 0;
  padding: 24px 18px;
  background: var(--vault-black);
}

.page-about .coverage-stat__value {
  display: block;
  margin-bottom: 6px;
  color: var(--white);
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4vw, 2.6rem);
}

.page-about .coverage-stat:first-child .coverage-stat__value {
  color: var(--crown);
}

.page-about .coverage-stat__label {
  color: var(--ink-2);
  font-size: 13px;
}

.page-about .about-next {
  padding-block: clamp(56px, 9vw, 96px);
  border-top: 1px solid var(--line);
  background: var(--vault-black);
}

.page-about .about-next__inner {
  display: grid;
  gap: 32px;
  align-items: end;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: var(--pill);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .btn--ghost {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--white);
}

.page-about .btn--ghost:hover {
  border-color: var(--crown);
  color: var(--crown);
}

.page-about .btn--primary {
  border: 1px solid var(--amber);
  background: var(--amber);
  color: var(--vault-black);
}

.page-about .btn--primary:hover {
  border-color: var(--white);
  background: var(--white);
}

@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-chapter__grid {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 32px;
  }

  .page-about .about-chapter__rail {
    position: sticky;
    top: 128px;
    align-self: start;
  }

  .page-about .about-chapter__rail .chapter__number {
    writing-mode: vertical-rl;
    text-orientation: mixed;
  }

  .page-about .principle {
    grid-template-columns: 56px minmax(0, 1fr);
  }

  .page-about .entry-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

  .page-about .service-layout {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }

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

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

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (min-width: 900px) {
  .page-about .timeline-node__extra {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    transition: max-height 0.28s var(--ease), opacity 0.2s var(--ease), margin 0.2s var(--ease);
  }

  .page-about .timeline-node:hover .timeline-node__extra,
  .page-about .timeline-node:focus .timeline-node__extra,
  .page-about .timeline-node:focus-within .timeline-node__extra {
    max-height: 120px;
    margin-top: 8px;
    opacity: 1;
  }
}

@media (min-width: 1024px) {
  .page-about .timeline-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: 56px;
  }

  .page-about .timeline-figure {
    position: sticky;
    top: 128px;
  }

  .page-about .service-aside {
    position: sticky;
    top: 128px;
  }
}