.page-about {
  --page-accent: var(--primary);
  --page-card: var(--card-bg);
  --page-border: var(--border);
  --page-muted: var(--text-sub);
  --page-dark: var(--section-dark);
  --page-ink: var(--section-ink);
  font-family: var(--font-body);
  color: var(--text-main);
  background: var(--page-bg);
}

.page-about .container {
  max-width: 960px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem;
}

.page-about .page-hero {
  background: var(--page-dark);
  color: var(--page-ink);
  padding: 3rem 0;
}

.page-about .page-hero .container {
  padding-top: 2rem;
}

.page-about .page-hero h1 {
  font-family: var(--font-head);
  font-size: 2.5rem;
  margin: 0 0 .5rem;
}

.page-about .lead {
  font-size: 1.25rem;
  max-width: 42rem;
  line-height: 1.6;
}

.page-about .hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 1rem 0;
}

.page-about .hero-actions {
  margin-top: 1.5rem;
}

.page-about .btn {
  display: inline-block;
  padding: .6rem 1.25rem;
  border-radius: 6px;
  background: var(--page-accent);
  color: #fff;
  text-decoration: none;
  margin-right: .5rem;
  font-weight: 600;
}

.page-about .section {
  background: var(--page-bg);
}

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

.page-about .section-dark .section-note,
.page-about .section-dark .layer-note {
  color: var(--page-ink);
  opacity: .8;
}

.page-about .section-heading {
  font-family: var(--font-head);
  font-size: 1.75rem;
  margin: 0 0 1rem;
}

.page-about .section-note {
  color: var(--page-muted);
  margin-bottom: 1rem;
}

.page-about .prose {
  max-width: 72ch;
  line-height: 1.75;
}

.page-about .prose p {
  margin-bottom: 1rem;
}

.page-about .tile-matrix {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.page-about .tile {
  flex: 1 1 160px;
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  background: var(--page-card);
  border: 1px solid var(--page-border);
}

.page-about .tile-blue {
  border-top: 4px solid var(--tag-blue);
}

.page-about .tile-green {
  border-top: 4px solid var(--tag-green);
}

.page-about .tile-orange {
  border-top: 4px solid var(--tag-orange);
}

.page-about .tile-count {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--page-accent);
  font-family: var(--font-head);
}

.page-about .tile span:last-child {
  font-size: .875rem;
  color: var(--page-muted);
}

.page-about .layer-figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  margin: 1.5rem 0;
}

.page-about .figure-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  max-height: 240px;
  object-fit: cover;
  border-radius: 12px;
}

.page-about .layer-diagram,
.page-about .timeline {
  width: 100%;
  max-width: 600px;
  height: auto;
  display: block;
}

.page-about .layer-diagram line,
.page-about .layer-diagram rect {
  stroke: var(--page-border);
  stroke-width: 1.5;
}

.page-about .layer-diagram rect {
  fill: var(--page-card);
}

.page-about .layer-diagram text {
  fill: var(--text-main);
  font-family: var(--font-body);
  font-size: 12px;
}

.page-about .section-dark .layer-diagram line,
.page-about .section-dark .layer-diagram rect {
  stroke: var(--page-ink);
  opacity: .7;
}

.page-about .section-dark .layer-diagram rect {
  fill: var(--card-bg);
}

.page-about .section-dark .layer-diagram text {
  fill: var(--page-ink);
}

.page-about .timeline line {
  stroke: var(--page-border);
  stroke-width: 2;
}

.page-about .timeline circle {
  fill: var(--page-accent);
}

.page-about .timeline text {
  fill: var(--text-main);
  font-family: var(--font-body);
  font-size: 11px;
}

.page-about .path-steps {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  list-style: none;
  margin: 1.5rem 0;
  padding: 0;
  counter-reset: step;
}

.page-about .path-steps li {
  counter-increment: step;
  flex: 1 1 200px;
  background: var(--page-card);
  border: 1px solid var(--page-border);
  border-radius: 10px;
  padding: 1rem 1rem 1rem 2.5rem;
  position: relative;
}

.page-about .path-steps li::before {
  content: counter(step);
  position: absolute;
  left: .75rem;
  top: .75rem;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--page-accent);
  font-weight: 700;
}

.page-about .path-steps li + li::after {
  content: "\2192";
  position: absolute;
  right: -.8rem;
  top: 1rem;
  color: var(--page-muted);
  z-index: 1;
}

.page-about a {
  color: var(--page-accent);
}

.page-about .section-dark a {
  color: var(--page-ink);
}

/* Desktop layout (mobile-first) */
@media (min-width: 768px) {
  .page-about .container {
    padding: 3rem 2rem;
  }

  .page-about .page-hero {
    padding: 4rem 0;
  }

  .page-about .page-hero h1 {
    font-size: 3rem;
  }

  .page-about .section-heading {
    font-size: 2rem;
  }

  .page-about .tile-matrix {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2.5rem;
  }

  .page-about .tile {
    padding: 2rem 1.5rem;
  }

  .page-about .layer-figure {
    gap: 1.5rem;
    margin: 2rem 0;
  }

  .page-about .path-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.25rem;
  }

  .page-about .path-steps li + li::after {
    right: -.9rem;
  }
}