.page-about {
  background: var(--bg-ink);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: clip;
  scroll-behavior: smooth;
}

.page-about ::selection {
  background: var(--data-green);
  color: var(--bg-ink);
}

.page-about .ab-hero {
  position: relative;
  padding: clamp(32px, 7vw, 80px) 24px 24px;
  isolation: isolate;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(rgba(30, 39, 56, 0.32) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 39, 56, 0.32) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(to bottom, #000 0%, transparent 100%);
  pointer-events: none;
}

.page-about .breadcrumb {
  max-width: 1080px;
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: 13px;
}

.page-about .breadcrumb__item {
  color: var(--text-secondary);
  text-decoration: none;
}

.page-about .breadcrumb__item[aria-current="page"] {
  color: var(--data-green);
}

.page-about .breadcrumb__sep {
  color: var(--line-grid);
  padding: 0 8px;
}

.page-about .ab-hero__inner {
  max-width: 1080px;
}

.page-about .ab-hero h1 {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(48px, 9vw, 96px);
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.page-about .ab-hero__sub {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(16px, 3vw, 28px);
  line-height: 1.3;
  color: var(--data-green);
  padding-left: 12px;
  border-left: 4px solid var(--data-green);
}

.page-about .ab-hero__lead {
  max-width: 680px;
  margin: 24px 0 0;
  font-size: 16px;
  color: var(--text-secondary);
}

.page-about .ab-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .ab-hero__tags .badge {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 8px 12px;
  border-radius: 2px;
  border: 1px solid var(--line-grid);
  background: rgba(16, 23, 36, 0.72);
  color: var(--text-primary);
}

.page-about .ab-archive {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px 72px;
  align-items: start;
}

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

.page-about .ab-side__stick {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.page-about .ab-side__cover {
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--line-grid);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), calc(100% - 24px) 100%, 0 100%);
}

.page-about .ab-toc {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--data-green);
  background: rgba(16, 23, 36, 0.6);
}

.page-about .ab-toc li + li {
  border-top: 1px solid var(--line-grid);
}

.page-about .ab-toc a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 12px;
  font-family: var(--font-mono);
  font-size: 14px;
  text-decoration: none;
  color: var(--text-secondary);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.page-about .ab-toc a:hover {
  color: var(--data-green);
  background-color: rgba(199, 255, 67, 0.08);
}

.page-about .ab-side__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
}

.page-about .ab-pages {
  min-width: 0;
  border: 1px solid var(--line-grid);
  border-radius: 6px;
  padding: 8px 24px 40px;
  background:
    radial-gradient(circle at 82% 8%, rgba(46, 125, 255, 0.08) 0, transparent 360px),
    linear-gradient(rgba(30, 39, 56, 0.22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 39, 56, 0.22) 1px, transparent 1px);
  background-size: auto, 32px 32px, 32px 32px;
}

.page-about .ab-section {
  padding: 40px 0;
  scroll-margin-top: calc(var(--header-h) + 16px);
}

.page-about .ab-section + .ab-section {
  border-top: 1px solid rgba(199, 255, 67, 0.3);
}

.page-about .ab-section__title {
  margin: 16px 0 12px;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(28px, 5vw, 44px);
  line-height: 1.12;
  color: var(--text-primary);
}

.page-about .ab-section p {
  max-width: 720px;
  color: var(--text-secondary);
}

.page-about .ab-section h3 {
  margin: 8px 0 6px;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--text-primary);
}

.page-about .ab-metrics {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 24px;
}

.page-about .ab-metrics .metric {
  background: var(--surface-code);
  border: 1px solid var(--line-grid);
  border-radius: 4px;
  padding: 20px 16px;
  min-width: 0;
}

.page-about .ab-version__head {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  align-items: flex-end;
}

.page-about .ab-timeline {
  margin-top: 24px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: 12px;
  scrollbar-color: var(--data-green) var(--surface-code);
}

.page-about .ab-timeline__track {
  display: flex;
  gap: 16px;
  width: max-content;
  list-style: none;
  margin: 0;
  padding: 4px 4px 8px;
}

.page-about .ab-timeline__item {
  flex: 0 0 260px;
  max-width: 80vw;
  scroll-snap-align: start;
  position: relative;
}

.page-about .ab-timeline__marker {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 14px;
  color: var(--data-green);
  padding: 4px 0 8px;
}

.page-about .ab-timeline__card {
  background: rgba(16, 23, 36, 0.85);
  border: 1px solid var(--line-grid);
  border-radius: 4px;
  padding: 20px;
  min-height: 180px;
  transition: border-color 0.2s ease, transform 0.2s ease, background-color 0.2s ease;
}

.page-about .ab-timeline__card:hover,
.page-about .ab-timeline__card:focus-within {
  border-color: var(--data-green);
  background-color: var(--surface-code);
  transform: translateY(-4px);
}

.page-about .ab-timeline__card p {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0;
}

.page-about .ab-version__img,
.page-about .ab-flow__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  margin-top: 28px;
  border-radius: 4px;
  border: 1px solid var(--line-grid);
  object-fit: cover;
}

.page-about .ab-flow__steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
}

.page-about .ab-flow__step {
  position: relative;
  background: var(--surface-code);
  border: 1px solid var(--line-grid);
  border-radius: 4px;
  padding: 24px 18px 20px;
  min-width: 0;
}

.page-about .ab-flow__step::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 16px;
  height: 16px;
  background: var(--tech-blue);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
}

.page-about .ab-flow__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 36px;
  line-height: 1;
  color: var(--hot-orange);
}

.page-about .ab-flow__step p {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 6px 0 12px;
}

.page-about .ab-flow__dept {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--tech-blue);
  border: 1px solid var(--line-grid);
  border-radius: 2px;
  padding: 4px 10px;
}

.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 24px;
}

.page-about .ab-team__unit {
  position: relative;
  overflow: hidden;
  min-width: 0;
  padding: 28px 20px;
  border: 1px solid var(--line-grid);
  border-radius: 4px;
  background: linear-gradient(135deg, var(--surface-code) 0%, transparent 100%);
}

.page-about .ab-team__unit::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 20px;
  height: 20px;
  background: var(--data-green);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
}

.page-about .ab-team__count {
  display: block;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 64px;
  line-height: 1;
  color: var(--text-primary);
}

.page-about .ab-team__role {
  display: block;
  margin-top: 12px;
  font-size: 18px;
  font-weight: 700;
  color: var(--data-green);
}

.page-about .ab-team__dept {
  display: block;
  margin-top: 6px;
  font-size: 14px;
  color: var(--text-secondary);
}

.page-about .ab-charter {
  border-left: 4px solid var(--data-green);
  padding-left: 24px;
  background: linear-gradient(90deg, rgba(199, 255, 67, 0.08) 0%, transparent 100%);
}

.page-about .ab-charter ul {
  list-style: none;
  margin: 16px 0 24px;
  padding: 0;
}

.page-about .ab-charter li {
  position: relative;
  padding: 8px 0 8px 28px;
  color: var(--text-secondary);
}

.page-about .ab-charter li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  width: 10px;
  height: 10px;
  background: var(--data-green);
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

.page-about .ab-charter__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 8px;
}

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

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

@media (min-width: 768px) {
  .page-about .ab-archive {
    grid-template-columns: 280px minmax(0, 1fr);
    gap: 48px;
    padding: 0 24px 96px;
  }

  .page-about .ab-side {
    position: sticky;
    top: 0;
  }

  .page-about .ab-side__stick {
    position: sticky;
    top: calc(var(--header-h) + 24px);
  }

  .page-about .ab-pages {
    padding: 16px 32px 48px;
  }

  .page-about .ab-section {
    padding: 56px 0;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-flow__steps {
    grid-template-columns: repeat(5, 1fr);
  }
}