.page-about {
  display: block;
  padding-top: var(--container-pad);
}

.page-about .section {
  margin-bottom: clamp(4rem, 9vw, 7.5rem);
}

.page-about .section-head {
  margin-bottom: 2rem;
}

.page-about .about-archive-inner {
  position: relative;
  padding: clamp(2rem, 5vw, 4.5rem);
  background: var(--grad-stellar);
  border: 1px solid rgba(232, 184, 75, 0.5);
  overflow: hidden;
}

.page-about .about-archive-coord {
  position: absolute;
  top: 1rem;
  left: 1.5rem;
  right: 1.5rem;
  display: flex;
  justify-content: space-between;
  color: var(--c-moon);
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .about-archive .expo-tag {
  color: var(--c-gold);
}

.page-about .about-archive h1 {
  margin: 3rem 0 0.75rem;
  font-size: var(--t-h1);
  line-height: var(--lh-display);
  color: var(--c-pearl);
  max-width: 12ch;
}

.page-about .about-declare {
  max-width: 48ch;
  margin-bottom: 2rem;
  font-size: clamp(1rem, 2vw, 1.375rem);
  line-height: var(--lh-body);
  color: var(--c-pearl);
}

.page-about .about-archive-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--c-galaxy);
  color: var(--c-moon);
  font-size: var(--t-caption);
  font-family: var(--font-display);
  letter-spacing: 0.06em;
}

.page-about .about-timeline-hero,
.page-about .archive-visual .media-frame,
.page-about .coverage-map .media-frame {
  margin: 0;
}

.page-about .about-timeline-hero img,
.page-about .archive-visual img,
.page-about .coverage-map img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-timeline-hero {
  margin-bottom: 3rem;
}

.page-about .about-timeline-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

.page-about .about-timeline {
  position: relative;
  padding-left: 2rem;
  border-left: 1px solid var(--c-galaxy);
}

.page-about .timeline-node {
  position: relative;
  margin-bottom: 2rem;
}

.page-about .timeline-node::before {
  content: "";
  position: absolute;
  left: -2.35rem;
  top: 1.3rem;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 4px var(--c-deep), 0 0 0 6px rgba(232, 184, 75, 0.28);
}

.page-about .timeline-summary {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  cursor: pointer;
  list-style: none;
  padding: 0.5rem 0 0.75rem;
}

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

.page-about .timeline-summary:hover .timeline-title {
  color: var(--c-gold-soft);
}

.page-about .timeline-year {
  font-family: var(--font-display);
  font-size: var(--t-h3);
  font-weight: 600;
  color: var(--c-gold);
  line-height: 1;
}

.page-about .timeline-title {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--c-pearl);
  transition: color var(--dur) var(--ease-out);
}

.page-about .timeline-detail {
  padding: 0;
  margin-top: 0.65rem;
  color: var(--c-moon);
  font-size: var(--t-caption);
  line-height: var(--lh-body);
}

.page-about .timeline-node[open] .timeline-summary {
  border-bottom: 1px dashed var(--c-galaxy);
  margin-bottom: 0.75rem;
}

.page-about .about-plates {
  display: grid;
  gap: 1.25rem;
  align-content: start;
}

.page-about .about-plates .plate {
  background: var(--c-nebula);
  border: 1px solid var(--c-galaxy);
}

.page-about .about-plates .plate-head {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--c-galaxy);
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--c-gold);
}

.page-about .about-plates .plate-body {
  padding: 1rem;
}

.page-about .about-plates .plate-value {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--c-pearl);
}

.page-about .about-plates .plate-note {
  margin: 0;
  color: var(--c-moon);
  font-size: var(--t-caption);
  line-height: var(--lh-caption);
}

.page-about .metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.page-about .metric-cell {
  padding: 1.25rem;
  background: linear-gradient(145deg, var(--c-nebula) 0%, var(--c-deep) 100%);
  border: 1px solid var(--c-galaxy);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: border-color var(--dur) var(--ease-out), transform var(--dur) var(--ease-out);
}

.page-about .metric-cell:hover {
  border-color: rgba(232, 184, 75, 0.65);
  transform: translateY(-2px);
}

.page-about .metric-num {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4.5vw, 2.9rem);
  line-height: 1.1;
  color: var(--c-gold);
}

.page-about .metric-label {
  color: var(--c-moon);
  font-size: var(--t-caption);
  letter-spacing: 0.04em;
}

.page-about .metrics-note {
  border-left: 2px solid var(--c-gold);
  padding: 0.85rem 1rem;
  color: var(--c-moon);
  line-height: var(--lh-body);
}

.page-about .archive-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

.page-about .archive-tree {
  display: grid;
  gap: 1.5rem;
}

.page-about .tree-item {
  display: flex;
  gap: 1rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--c-galaxy);
}

.page-about .tree-item:last-child {
  border-bottom: 0;
}

.page-about .tree-code {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--c-gold);
}

.page-about .tree-item h3 {
  margin: 0 0 0.25rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--c-pearl);
}

.page-about .tree-item p {
  margin: 0;
  color: var(--c-moon);
  font-size: var(--t-caption);
  line-height: var(--lh-caption);
}

.page-about .credential-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about .credential-card {
  position: relative;
  padding: 1.5rem;
  background: var(--c-nebula);
  border: 1px solid var(--c-galaxy);
}

.page-about .credential-year {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  padding: 0.25rem 0.6rem;
  font-family: var(--font-display);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--c-gold);
  background: rgba(232, 184, 75, 0.1);
}

.page-about .credential-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
  color: var(--c-pearl);
}

.page-about .credential-card p {
  margin: 0;
  color: var(--c-moon);
  font-size: var(--t-caption);
  line-height: var(--lh-body);
}

.page-about .coverage-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

.page-about .coverage-lead {
  margin: 0 0 1.5rem;
  font-family: var(--font-display);
  font-size: 1.3rem;
  line-height: var(--lh-heading);
  color: var(--c-pearl);
}

.page-about .coverage-list {
  list-style: none;
  margin: 0 0 2rem;
  padding: 0;
  display: grid;
  gap: 0.8rem;
}

.page-about .coverage-list li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--c-moon);
  line-height: var(--lh-body);
}

.page-about .coverage-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--c-gold);
}

.page-about .coverage-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-about .about-extra-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--c-galaxy);
  font-family: var(--font-display);
  font-size: 0.9rem;
}

.page-about .about-extra-links a {
  color: var(--c-gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease-out);
}

.page-about .about-extra-links a:hover {
  border-bottom-color: var(--c-gold);
}

@media (min-width: 900px) {
  .page-about .about-timeline-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 3.5rem;
  }

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

  .page-about .archive-layout {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 3rem;
  }

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

  .page-about .coverage-layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 3rem;
  }
}