.page-about {
  --about-grid-ruler: rgba(174, 243, 89, 0.045);
  --about-gold-line: rgba(212, 175, 55, 0.14);
  --about-panel: rgba(14, 76, 55, 0.52);
  background-color: var(--green-primary);
  background-image:
    linear-gradient(to right, var(--about-grid-ruler) 1px, transparent 1px),
    linear-gradient(to bottom, var(--about-grid-ruler) 1px, transparent 1px);
  background-size: 44px 44px;
  color: var(--text-bright);
}

.page-about .container {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.page-about .breadcrumb {
  margin-block: 1.25rem 0.25rem;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.page-about .breadcrumb a {
  color: var(--gold);
  text-decoration: none;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-inline: 0.4rem;
  color: var(--text-muted);
}

.page-about .breadcrumb li[aria-current="page"] {
  color: var(--text-bright);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  padding-block: clamp(1rem, 4vw, 3rem) var(--section-pad-y);
}

.page-about .about-body {
  min-width: 0;
}

.page-about .about-section {
  position: relative;
  margin-bottom: clamp(3rem, 8vw, 5.5rem);
  scroll-margin-top: 7.5rem;
}

.page-about .about-section:last-child {
  margin-bottom: 0;
}

.page-about .about-section:not(.about-brand-section) {
  padding-left: clamp(0.5rem, 2vw, 1.5rem);
}

.page-about .about-section:not(.about-brand-section)::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.25rem;
  bottom: 0.25rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--gold), transparent);
  opacity: 0.5;
  pointer-events: none;
}

.page-about .about-toc {
  position: relative;
  min-width: 0;
  z-index: 2;
}

.page-about .about-toc-card {
  border: 1px solid var(--border-gold);
  background: rgba(11, 58, 45, 0.82);
  border-radius: 18px;
  padding: 1.25rem;
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(8px);
}

.page-about .about-toc-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  letter-spacing: 0.12em;
  color: var(--gold-light);
  margin: 0 0 0.75rem;
}

.page-about .about-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.35rem;
}

.page-about .about-toc-link {
  display: flex;
  gap: 0.5rem;
  align-items: baseline;
  color: var(--text-body);
  text-decoration: none;
  padding: 0.45rem 0.55rem;
  border-radius: 10px;
  font-size: 0.9rem;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-toc-link span {
  font-family: var(--font-data);
  color: var(--gold);
  font-size: 0.8rem;
}

.page-about .about-toc-link:hover {
  background: rgba(212, 175, 55, 0.12);
  color: var(--gold-light);
}

.page-about .about-brand-section {
  overflow: hidden;
  padding: clamp(1.5rem, 4vw, 3.5rem);
  border: 1px solid var(--border-gold);
  border-radius: 28px 8px 28px 8px;
  background: linear-gradient(135deg, rgba(14, 76, 55, 0.9), rgba(8, 31, 24, 0.85));
  box-shadow: var(--shadow-card);
}

.page-about .about-brand-section::before {
  content: "";
  position: absolute;
  top: -10%;
  right: -5%;
  width: 60%;
  height: 120%;
  background: linear-gradient(120deg, rgba(212, 175, 55, 0.14), transparent 55%);
  transform: skewX(-8deg);
  pointer-events: none;
}

.page-about .about-brand-section::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), transparent 70%);
  pointer-events: none;
}

.page-about .about-brand-section > * {
  position: relative;
  z-index: 1;
}

.page-about .page-heading {
  max-width: 860px;
}

.page-about .page-heading-index {
  font-family: var(--font-data);
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  color: var(--gold-light);
  text-transform: uppercase;
}

.page-about .page-heading-title {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.05;
  font-size: clamp(2.1rem, 5.5vw, 3.4rem);
  margin: 0.6rem 0 1rem;
  color: var(--text-bright);
  text-wrap: balance;
}

.page-about .page-heading-desc {
  font-size: clamp(1rem, 2vw, 1.15rem);
  color: var(--text-body);
  max-width: 60ch;
  margin: 0;
}

.page-about .about-brand-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  margin-top: 2rem;
}

.page-about .about-brand-copy p {
  margin: 0 0 1.2rem;
  color: var(--text-body);
  max-width: 65ch;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.page-about .btn {
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), filter var(--dur) var(--ease);
}

.page-about .btn:hover {
  transform: translateY(-2px);
}

.page-about .btn-gold {
  box-shadow: var(--shadow-gold);
}

.page-about .about-brand-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0;
  padding: 0;
}

.page-about .about-stat {
  border: 1px solid var(--border-gold);
  background: rgba(245, 247, 242, 0.06);
  border-radius: 16px;
  padding: 1rem 0.9rem;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-stat:hover {
  transform: translateY(-4px);
  border-color: var(--border-gold-strong);
}

.page-about .about-stat dt {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.page-about .about-stat dd {
  font-family: var(--font-data);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  color: var(--gold);
  line-height: 1;
  margin: 0;
}

.page-about .about-stat dd span {
  color: var(--gold-light);
}

.page-about .section-header {
  display: grid;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
}

.page-about .section-index {
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  line-height: 1.1;
  margin: 0;
  color: var(--text-bright);
}

.page-about .section-desc {
  max-width: 72ch;
  color: var(--text-body);
  margin: 0.5rem 0 0;
}

.page-about .about-timeline {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--gold), rgba(212, 175, 55, 0.12));
}

.page-about .about-timeline-item {
  position: relative;
  padding-left: 2.2rem;
  padding-bottom: 1.8rem;
}

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

.page-about .timeline-node {
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--green-primary);
  border: 3px solid var(--gold);
  box-shadow: 0 0 0 5px rgba(212, 175, 55, 0.12);
}

.page-about .timeline-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  letter-spacing: 0.03em;
  color: var(--gold-light);
  margin: 0 0 0.4rem;
}

.page-about .timeline-content p {
  margin: 0;
  color: var(--text-body);
  max-width: 64ch;
}

.page-about .about-visual {
  margin-top: 2.5rem;
}

.page-about .thumb-frame {
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--border-gold);
  box-shadow: var(--shadow-card);
}

.page-about .about-visual figcaption {
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.page-about .about-coverage-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  margin-top: 2rem;
  align-items: start;
}

.page-about .about-coverage-data {
  min-width: 0;
}

.page-about .coverage-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
}

.page-about .data-card {
  border: 1px solid var(--border-gold-strong);
  background: rgba(245, 247, 242, 0.07);
  border-radius: 16px;
  padding: 1rem;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .data-card:hover {
  transform: translateY(-3px);
  border-color: var(--gold-light);
}

.page-about .data-card-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.page-about .data-card-value {
  display: block;
  font-family: var(--font-data);
  color: var(--gold);
  font-size: 2rem;
  line-height: 1.2;
  margin: 0.2rem 0 0.3rem;
}

.page-about .data-card-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.page-about .coverage-note {
  margin: 1.25rem 0 0;
  color: var(--text-body);
  max-width: 62ch;
}

.page-about .coverage-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  list-style: none;
  padding: 0;
  margin: 2rem 0 0;
}

.page-about .ios-steps {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .ios-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
  padding: 1.25rem;
  border: 1px solid var(--border-gold);
  border-radius: 18px;
  background: rgba(245, 247, 242, 0.06);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ios-step:hover {
  transform: translateY(-3px);
  border-color: var(--border-gold-strong);
}

.page-about .ios-step-num {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--gold);
  color: var(--green-deep);
  font-family: var(--font-data);
  font-weight: 700;
}

.page-about .ios-step-copy h3 {
  margin: 0 0 0.25rem;
  font-family: var(--font-display);
  font-size: 1.1rem;
  color: var(--text-bright);
}

.page-about .ios-step-copy p {
  margin: 0;
  color: var(--text-body);
}

.page-about .ios-note {
  margin-top: 1.5rem;
  padding: 1.25rem;
  border-left: 3px solid var(--lime);
  background: rgba(174, 243, 89, 0.08);
  border-radius: 0 16px 16px 0;
  color: var(--text-body);
}

.page-about .ios-note p {
  margin: 0 0 0.5rem;
}

.page-about .ios-note p:last-child {
  margin-bottom: 0;
}

.page-about .ios-note a {
  color: var(--gold-light);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.page-about .about-arch-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  margin-top: 2rem;
  align-items: start;
}

.page-about .about-arch-copy {
  min-width: 0;
}

.page-about .about-arch-copy > p {
  color: var(--text-body);
  max-width: 65ch;
}

.page-about .about-arch-list {
  list-style: none;
  margin: 1.5rem 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.page-about .about-arch-list li {
  padding: 1rem 1.1rem;
  border-radius: 14px;
  background: rgba(245, 247, 242, 0.06);
  border: 1px solid var(--about-gold-line);
  color: var(--text-body);
}

.page-about .about-arch-list strong {
  color: var(--gold-light);
}

.page-about .about-explore-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin-top: 2rem;
}

.page-about .about-explore-card {
  display: block;
  padding: 1.4rem;
  border: 1px solid var(--border-gold);
  border-radius: 18px;
  background: linear-gradient(140deg, rgba(14, 76, 55, 0.65), rgba(8, 31, 24, 0.8));
  color: var(--text-body);
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-explore-card:hover {
  transform: translateY(-4px);
  border-color: var(--gold-light);
  box-shadow: var(--shadow-gold);
  color: var(--text-bright);
}

.page-about .about-explore-num {
  font-family: var(--font-data);
  color: var(--gold);
  font-size: 0.9rem;
}

.page-about .about-explore-card h3 {
  margin: 0.5rem 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--text-bright);
}

.page-about .about-explore-card p {
  margin: 0;
  font-size: 0.95rem;
}

@media (max-width: 959px) {
  .page-about .about-toc-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    overflow-x: auto;
  }

  .page-about .about-toc-title {
    flex: 0 0 auto;
    margin: 0;
  }

  .page-about .about-toc-list {
    display: flex;
    gap: 0.35rem;
    flex: 0 0 auto;
  }

  .page-about .about-toc-link {
    white-space: nowrap;
  }
}

@media (min-width: 560px) {
  .page-about .coverage-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-explore-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-brand-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-coverage-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.9fr);
  }

  .page-about .about-arch-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr);
  }

  .page-about .coverage-visual,
  .page-about .arch-visual {
    margin-top: 0;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-top) + 80px);
  }
}

@media (min-width: 1180px) {
  .page-about .coverage-cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}