.page-about {
  --about-toc-width: 190px;
  background:
    radial-gradient(900px 500px at 85% -60px, var(--c-glow), transparent 60%),
    linear-gradient(var(--c-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-grid) 1px, transparent 1px);
  background-size: auto, 44px 44px, 44px 44px;
}

.page-about .about-hero {
  padding: 28px 0 28px;
  border-bottom: 1px solid var(--c-line-soft);
}

.page-about .about-hero-inner {
  display: grid;
  gap: 24px;
  align-items: center;
}

.page-about .about-hero-copy h1 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4.2vw, 2.75rem);
  line-height: 1.12;
  margin: 4px 0 16px;
  color: var(--c-ink);
}

.page-about .page-leading {
  color: var(--c-mist);
  font-size: 1.02rem;
  line-height: 1.75;
  max-width: 64ch;
}

.page-about .about-hero-note {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.8;
  color: var(--c-mist);
  border-left: 2px solid var(--c-accent);
  padding-left: 14px;
  margin: 20px 0;
  max-width: 56ch;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero-figure {
  margin: 0;
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--c-raised);
}

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

.page-about .about-hero-figure img {
  width: 100%;
  object-fit: cover;
}

.page-about .media-caption {
  padding: 10px 14px;
  border-top: 1px solid var(--c-line-soft);
  color: var(--c-mist);
  font-size: 0.8rem;
  margin: 0;
}

.page-about .about-body {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding-top: 28px;
  padding-bottom: 40px;
}

.page-about .about-toc {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  padding: 0 0 16px;
  border-bottom: 1px solid var(--c-line-soft);
}

.page-about .about-toc .panel-index {
  display: none;
}

.page-about .about-toc-title {
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--c-mist);
  text-transform: uppercase;
}

.page-about .about-toc-link {
  color: var(--c-mist);
  text-decoration: none;
  font-size: 0.82rem;
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-pill);
  padding: 5px 12px;
  transition: border-color var(--transition), color var(--transition);
}

.page-about .about-toc-link:hover {
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.page-about .about-chapters {
  display: flex;
  flex-direction: column;
  gap: 24px;
  min-width: 0;
}

.page-about .section-panel {
  position: relative;
  background: linear-gradient(135deg, rgba(127, 184, 212, 0.03), transparent 42%), var(--c-panel);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-lg);
  padding: 26px 22px;
  overflow: hidden;
}

.page-about .section-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--c-accent), var(--c-accent-soft));
  opacity: 0.75;
}

.page-about .section-panel h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  line-height: 1.18;
  color: var(--c-ink);
  margin: 6px 0 8px;
}

.page-about .about-lead {
  color: var(--c-mist);
  line-height: 1.7;
  margin: 0 0 10px;
  max-width: 72ch;
}

.page-about .section-panel p {
  color: var(--c-mist);
  line-height: 1.7;
}

.page-about .section-panel a {
  color: var(--c-accent);
  text-decoration: none;
}

.page-about .section-panel a:hover {
  text-decoration: underline;
}

.page-about .about-philosophy-grid {
  display: grid;
  gap: 24px;
  margin-top: 18px;
}

.page-about .about-philosophy-copy p + p {
  margin-top: 12px;
}

.page-about .about-principle-card {
  background: var(--c-raised);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-md);
  padding: 16px;
}

.page-about .about-principle-card + .about-principle-card {
  margin-top: 12px;
}

.page-about .about-principle-card .mono,
.page-about .workflow-step .mono {
  font-size: 0.8rem;
  color: var(--c-accent);
}

.page-about .about-principle-card h3,
.page-about .workflow-step h3 {
  font-size: 1.02rem;
  color: var(--c-ink);
  margin: 6px 0 6px;
}

.page-about .about-principle-card p,
.page-about .workflow-step p {
  font-size: 0.92rem;
  margin: 0;
}

.page-about .about-workflow-img,
.page-about .about-milestones-figure {
  margin: 20px 0 0;
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-workflow-img img,
.page-about .about-milestones-figure img {
  width: 100%;
  object-fit: cover;
}

.page-about .workflow-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 16px;
}

.page-about .workflow-step {
  position: relative;
  background: var(--c-raised);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-md);
  padding: 16px 16px 14px;
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .workflow-step:hover,
.page-about .workflow-step:focus-within {
  border-color: var(--c-line);
  transform: translateY(-2px);
}

.page-about .workflow-hint {
  display: inline-block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-mist);
  border: 1px solid rgba(127, 184, 212, 0.25);
  border-radius: var(--radius-pill);
  padding: 3px 10px;
  transition: border-color var(--transition), color var(--transition);
}

.page-about .workflow-step:hover .workflow-hint,
.page-about .workflow-step:focus-within .workflow-hint {
  border-color: var(--c-accent);
  color: var(--c-accent-soft);
}

.page-about .about-workflow-note {
  margin-top: 18px;
  padding: 14px 16px;
  border: 1px dashed var(--c-line-soft);
  border-radius: var(--radius-md);
  background: rgba(127, 184, 212, 0.03);
  font-size: 0.85rem;
}

.page-about .about-localization-grid {
  display: grid;
  gap: 22px;
  margin-top: 18px;
}

.page-about .about-localization-copy p + p {
  margin-top: 12px;
}

.page-about .localization-feature {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px 12px;
  background: var(--c-raised);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}

.page-about .localization-feature + .localization-feature {
  margin-top: 10px;
}

.page-about .localization-feature p {
  margin: 0;
  flex: 1 1 200px;
  font-size: 0.9rem;
}

.page-about .coverage-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 22px;
}

.page-about .coverage-stat {
  background: linear-gradient(135deg, rgba(255, 107, 44, 0.08), transparent 65%), var(--c-raised);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-md);
  padding: 18px 12px;
  text-align: center;
  transition: border-color var(--transition);
}

.page-about .coverage-stat:hover {
  border-color: rgba(255, 107, 44, 0.4);
}

.page-about .coverage-stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: 2.1rem;
  line-height: 1;
  color: var(--c-accent);
}

.page-about .coverage-stat-unit {
  display: block;
  margin-top: 8px;
  font-size: 0.78rem;
  color: var(--c-mist);
}

.page-about .coverage-detail {
  margin-top: 18px;
  padding-left: 16px;
  border-left: 2px solid var(--c-accent);
}

.page-about .coverage-detail p {
  margin: 0;
}

.page-about .about-filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 20px;
}

.page-about .filter-year-btn {
  padding-top: 4px;
  padding-bottom: 4px;
  font-size: 0.82rem;
}

.page-about .filter-year-btn.is-active {
  background: var(--c-accent);
  border-color: var(--c-accent);
  color: var(--c-ink);
}

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

.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 18px;
}

.page-about .about-timeline-line {
  position: absolute;
  left: 18px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  height: calc(100% - 12px);
  opacity: 0.35;
}

.page-about .timeline-item {
  position: relative;
  padding-left: 56px;
}

.page-about .timeline-node {
  position: absolute;
  left: 0;
  top: 0;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--c-deep);
  border: 2px solid var(--c-accent);
  box-shadow: 0 0 0 5px rgba(14, 30, 47, 0.9), 0 0 22px var(--c-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
  font-size: 0.64rem;
}

.page-about .timeline-card {
  background: var(--c-raised);
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-md);
  padding: 16px;
}

.page-about .timeline-card h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  color: var(--c-ink);
}

.page-about .timeline-card p {
  font-size: 0.88rem;
  margin: 0;
}

.page-about .timeline-card details {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--c-line-soft);
}

.page-about .timeline-card summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--c-accent);
  list-style: none;
}

.page-about .timeline-card summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline-card summary::before {
  content: "+ ";
}

.page-about .timeline-card details[open] summary::before {
  content: "− ";
}

.page-about .timeline-card details p {
  margin-top: 10px;
}

.page-about .about-milestones-figure {
  align-self: center;
}

.page-about .about-trust-strip {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  border: 1px solid var(--c-line-soft);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  background: rgba(127, 184, 212, 0.04);
  color: var(--c-mist);
  font-size: 0.84rem;
}

.page-about .about-trust-strip p {
  margin: 0;
  line-height: 1.7;
}

.page-about .about-outro {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 20px 0 4px;
  border-top: 1px solid var(--c-line-soft);
}

.page-about .about-outro p {
  color: var(--c-mist);
  margin: 0;
}

.page-about .about-outro a {
  color: var(--c-accent);
  text-decoration: none;
}

.page-about .about-outro a:hover {
  text-decoration: underline;
}

@media (min-width: 640px) {
  .page-about .coverage-stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 44px 0 40px;
  }

  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 48px;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-toc-width) minmax(0, 1fr);
    gap: 48px;
    padding-top: 40px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 24px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 2px 0 0 18px;
    border-bottom: 0;
    border-left: 2px solid var(--c-line-soft);
  }

  .page-about .about-toc .panel-index {
    display: inline-block;
    margin-bottom: 10px;
  }

  .page-about .about-toc-title {
    margin-bottom: 8px;
  }

  .page-about .about-toc-link {
    border: 0;
    border-radius: 0;
    padding: 7px 0;
    color: var(--c-mist);
  }

  .page-about .about-toc-link:hover {
    color: var(--c-accent);
  }

  .page-about .about-chapters {
    gap: 32px;
  }

  .page-about .section-panel {
    padding: 34px 32px;
    clip-path: polygon(0 0, calc(100% - 36px) 0, 100% 36px, 100% 100%, 0 100%);
  }

  .page-about .about-philosophy-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 40px;
  }

  .page-about .workflow-steps {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .page-about .about-localization-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    gap: 40px;
  }

  .page-about .about-milestones-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    gap: 32px;
  }

  .page-about .timeline-card p {
    font-size: 0.9rem;
  }
}