.page-about {
  --page-about-red-glow: rgba(232, 83, 46, 0.18);
  position: relative;
  background-color: var(--mgu-bg);
  background-image:
    linear-gradient(rgba(244, 233, 216, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244, 233, 216, 0.025) 1px, transparent 1px);
  background-size: 48px 48px;
}

.page-about::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--mgu-red) 0%, var(--mgu-red) 45%, transparent 100%);
}

.page-about__breadcrumb {
  padding-top: 1.25rem;
}

.page-about__intro {
  padding: 3rem 0 2.5rem;
}

.page-about__intro h1 {
  font-family: var(--mgu-font-display);
  font-size: clamp(2.2rem, 7vw, 4.6rem);
  line-height: 0.92;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--mgu-cream);
  margin: 0.8rem 0 1rem;
}

.page-about__intro .mgu-lead {
  max-width: 58ch;
}

.page-about__index {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--mgu-line-weak);
}

.page-about__index a {
  border: 1px solid var(--mgu-line-weak);
  border-radius: 2px;
  padding: 0.4rem 0.8rem;
  font-family: var(--mgu-font-mono);
  font-size: 0.8rem;
  color: var(--mgu-muted);
  text-decoration: none;
  transition: color var(--mgu-speed) var(--mgu-ease), border-color var(--mgu-speed) var(--mgu-ease);
}

.page-about__index a:hover,
.page-about__index a:focus-visible {
  color: var(--mgu-red);
  border-color: var(--mgu-red);
}

.page-about__section {
  padding: 3rem 0;
}

.page-about__section + .page-about__section {
  border-top: 1px solid var(--mgu-line-weak);
}

.page-about__chapter {
  margin-bottom: 1rem;
}

.page-about__chapter .mgu-chapter__num {
  color: rgba(244, 233, 216, 0.16);
  -webkit-text-stroke: 1px rgba(244, 233, 216, 0.35);
  font-family: var(--mgu-font-display);
  font-size: clamp(3.2rem, 8vw, 5.2rem);
  line-height: 0.85;
  margin-right: 1rem;
}

.page-about__chapter .mgu-chapter__label {
  font-family: var(--mgu-font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.85rem;
  color: var(--mgu-muted);
  padding-bottom: 0.75rem;
}

.page-about__section h2,
.page-about__related-title {
  font-family: var(--mgu-font-display);
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  line-height: 1;
  text-transform: uppercase;
  margin: 0 0 1rem;
  color: var(--mgu-cream);
}

.page-about__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
  margin-top: 1.5rem;
}

.page-about__text-col p {
  color: var(--mgu-muted);
  line-height: 1.8;
  margin-bottom: 1rem;
}

.page-about__text-col h3 {
  font-family: var(--mgu-font-body);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--mgu-cream);
  margin: 0 0 0.5rem;
}

.page-about__media {
  border: 1px solid var(--mgu-line-weak);
  border-radius: var(--mgu-radius);
  overflow: hidden;
  background: var(--mgu-surface);
  position: relative;
}

.page-about__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(125deg, transparent 45%, rgba(232, 83, 46, 0.08) 50%, transparent 60%);
  pointer-events: none;
}

.page-about__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  vertical-align: middle;
}

.page-about__media--wide {
  aspect-ratio: 12 / 5;
}

.page-about__media--chart {
  aspect-ratio: 3 / 2;
}

.page-about__media--tech {
  aspect-ratio: 2 / 1;
}

.page-about__media-caption {
  font-family: var(--mgu-font-mono);
  font-size: 0.75rem;
  color: var(--mgu-muted);
  margin-top: 0.5rem;
}

.page-about__timeline {
  position: relative;
  margin-top: 2.5rem;
  margin-left: 1rem;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.3rem;
  bottom: 0.3rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--mgu-red), rgba(232, 83, 46, 0.15));
}

.page-about__timeline-item {
  position: relative;
  padding-left: 1.75rem;
  padding-bottom: 2.25rem;
}

.page-about__timeline-item:last-child {
  padding-bottom: 0;
}

.page-about__timeline-item::before {
  content: "";
  position: absolute;
  left: -0.375rem;
  top: 1.6rem;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: var(--mgu-red);
  box-shadow: 0 0 0 4px var(--page-about-red-glow);
}

.page-about__timeline-year {
  display: block;
  font-family: var(--mgu-font-display);
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  line-height: 1;
  color: var(--mgu-red);
  margin-bottom: 0.25rem;
}

.page-about__timeline-card h3 {
  font-family: var(--mgu-font-body);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--mgu-cream);
  margin: 0.25rem 0 0.5rem;
}

.page-about__timeline-card p {
  color: var(--mgu-muted);
  line-height: 1.75;
  max-width: 60ch;
}

.page-about__stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
}

.page-about__stat-card {
  background: var(--mgu-surface);
  border: 1px solid var(--mgu-line-weak);
  border-radius: var(--mgu-radius);
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: border-color var(--mgu-speed) var(--mgu-ease);
}

.page-about__stat-card:hover {
  border-color: rgba(232, 83, 46, 0.5);
}

.page-about__stat-num {
  font-family: var(--mgu-font-display);
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 1;
  color: var(--mgu-red);
}

.page-about__stat-label {
  font-family: var(--mgu-font-mono);
  font-size: 0.75rem;
  color: var(--mgu-muted);
  letter-spacing: 0.06em;
}

.page-about__coverage-note {
  margin-top: 1.25rem;
  color: var(--mgu-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  padding: 0.85rem 1rem;
  border-left: 2px solid var(--mgu-red);
  background: rgba(232, 83, 46, 0.06);
}

.page-about__legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-top: 1rem;
}

.page-about__legend .mgu-legend__item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--mgu-muted);
}

.page-about__legend .mgu-legend__swatch {
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 2px;
}

.page-about__version-card {
  height: 100%;
  padding: 1.75rem;
  background: var(--mgu-surface);
  border: 1px solid var(--mgu-line-weak);
  border-radius: var(--mgu-radius);
  position: relative;
}

.page-about__version-card--v2 {
  border-color: rgba(212, 166, 79, 0.4);
  background: linear-gradient(180deg, rgba(21, 19, 16, 0.9), rgba(27, 23, 18, 0.8));
}

.page-about__version-tag {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  font-size: 0.72rem;
  font-family: var(--mgu-font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--mgu-line-strong);
  border-radius: 999px;
  color: var(--mgu-muted);
  margin-bottom: 1rem;
}

.page-about__version-tag--gold {
  color: var(--mgu-gold);
  border-color: rgba(212, 166, 79, 0.5);
}

.page-about__version-card h3 {
  font-family: var(--mgu-font-display);
  font-size: 1.8rem;
  line-height: 1;
  margin: 0 0 1rem;
  color: var(--mgu-cream);
}

.page-about__version-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about__version-list li {
  position: relative;
  padding-left: 1.25rem;
  color: var(--mgu-muted);
  line-height: 1.65;
}

.page-about__version-list li::before {
  content: "◆";
  position: absolute;
  left: 0;
  top: 0.35em;
  color: var(--mgu-red);
  font-size: 0.7rem;
}

.page-about__evolution-note {
  margin-top: 2rem;
  padding: 1.25rem 1.5rem;
  border-left: 3px solid var(--mgu-gold);
  background: rgba(212, 166, 79, 0.07);
  color: var(--mgu-muted);
  line-height: 1.75;
  max-width: 78ch;
}

.page-about__related {
  margin-top: 1rem;
}

.page-about__related-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
}

.page-about__related-card {
  padding: 1.5rem;
  display: block;
  color: var(--mgu-cream);
  text-decoration: none;
  transition: border-color var(--mgu-speed) var(--mgu-ease), transform var(--mgu-speed) var(--mgu-ease), box-shadow var(--mgu-speed) var(--mgu-ease);
}

.page-about__related-card:hover,
.page-about__related-card:focus-visible {
  border-color: var(--mgu-red);
  transform: translateY(-3px);
  box-shadow: 0 12px 30px var(--mgu-shadow);
}

.page-about__related-card h3 {
  font-size: 1.1rem;
  line-height: 1.4;
  margin: 0.75rem 0 0.5rem;
  font-family: var(--mgu-font-body);
  font-weight: 700;
  color: var(--mgu-cream);
}

.page-about__related-link {
  font-family: var(--mgu-font-mono);
  font-size: 0.8rem;
  color: var(--mgu-red);
}

@media (min-width: 36rem) {
  .page-about__stat-grid {
    gap: 1rem;
  }

  .page-about__related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 60rem) {
  .page-about__intro {
    padding: 4.5rem 0 3rem;
  }

  .page-about__section {
    padding: 4.5rem 0;
  }

  .page-about__split {
    grid-template-columns: 1fr 1fr;
    gap: 3.5rem;
    margin-top: 2rem;
  }

  .page-about__split--origin {
    grid-template-columns: 5fr 7fr;
  }

  .page-about__split--coverage {
    grid-template-columns: 7fr 5fr;
  }

  .page-about__timeline {
    margin-left: 2rem;
    max-width: 800px;
  }

  .page-about__timeline-item {
    padding-left: 2.5rem;
  }

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