.page-about {
  --about-gap: clamp(1.5rem, 3vw, 3rem);
  --about-section-pad: clamp(3rem, 7vw, 5.5rem) clamp(1rem, 4vw, 2rem);
  --about-hero-circle: 16rem;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
}

.page-about .about-breadcrumbs {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 1.5rem 1rem 0;
  color: var(--purple);
  font-size: 0.875rem;
}
.page-about .about-breadcrumbs ol {
  display: flex;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 0;
}
.page-about .about-breadcrumbs a {
  color: var(--peach-dark);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast);
}
.page-about .about-breadcrumbs a:hover {
  border-color: var(--peach-dark);
}

.page-about .about-hero {
  position: relative;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: clamp(3rem, 8vw, 5rem) clamp(1rem, 4vw, 2rem);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -6rem;
  right: -4rem;
  width: var(--about-hero-circle);
  height: var(--about-hero-circle);
  background: var(--peach-grad);
  border-radius: 50%;
  opacity: 0.75;
  z-index: 0;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  bottom: -8rem;
  left: 25%;
  width: 12rem;
  height: 12rem;
  border: 2rem solid var(--peach-card);
  border-radius: 50%;
  opacity: 0.7;
  z-index: 0;
}
.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
}
.page-about .about-kicker {
  margin-bottom: var(--space-2);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--peach-dark);
}
.page-about #about-page-title {
  max-width: 12em;
  margin: 0 0 var(--space-3);
  font-family: var(--font-heading);
  font-weight: 400;
  font-size: clamp(2rem, 5.5vw, 3.75rem);
  line-height: 1.15;
  color: var(--purple);
}
.page-about .about-hero-desc {
  max-width: 46rem;
  margin: 0 0 var(--space-5);
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  line-height: 1.8;
  color: var(--purple);
  opacity: 0.88;
}
.page-about .about-chapter-deck {
  max-width: 40rem;
  padding: var(--space-4) var(--space-5);
  background: var(--peach-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}
.page-about .about-chapter-deck-title {
  margin: 0 0 var(--space-3);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--peach-dark);
}
.page-about .about-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .about-toc-list .toc-item + .toc-item {
  border-top: 1px dashed var(--peach-border);
}
.page-about .about-toc-list .toc-link {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  color: var(--purple);
  text-decoration: none;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}
.page-about .about-toc-list .toc-link:hover {
  color: var(--peach-dark);
  padding-left: 0.5rem;
}
.page-about .about-toc-list .toc-index {
  font-family: var(--font-number);
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--gold);
}
.page-about .about-toc-list .toc-content {
  font-weight: 700;
}
.page-about .about-toc-list .toc-link-meta {
  margin-left: auto;
  font-size: 0.875rem;
  color: var(--peach-dark);
  opacity: 0.8;
}

.page-about .about-section {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: var(--about-section-pad);
}
.page-about .about-section-head {
  margin-bottom: var(--space-5);
}
.page-about .section-index {
  margin: 0 0 var(--space-2);
  font-family: var(--font-number);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.12em;
  color: var(--gold);
}
.page-about .section-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: 400;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  line-height: 1.2;
  color: var(--purple);
}
.page-about .section-desc {
  max-width: 40rem;
  margin: 0;
  font-size: 1.1rem;
  color: var(--purple);
  opacity: 0.8;
}

.page-about .about-story-grid {
  display: grid;
  gap: var(--about-gap);
  align-items: center;
}
.page-about .about-story-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  background: var(--peach-grad);
}
.page-about .about-story-text {
  max-width: 40rem;
}
.page-about .about-story-text p:last-child {
  margin-bottom: 0;
}
.page-about .about-highlight-block {
  margin: var(--space-3) 0;
  padding: var(--space-3) var(--space-4);
  border-left: 4px solid var(--gold);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--peach-card);
}
.page-about .about-highlight-block strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--purple);
}

.page-about .about-system {
  margin-bottom: var(--space-4);
  background: linear-gradient(180deg, var(--peach-card), var(--paper-light));
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}
.page-about .about-system-grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}
.page-about .about-system-chart {
  text-align: center;
}
.page-about .about-system-img {
  width: 100%;
  max-width: 26rem;
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 50%;
  background: var(--peach-grad);
  box-shadow: var(--shadow-peach);
}
.page-about .about-chart-caption {
  margin-top: var(--space-2);
  font-size: 0.875rem;
  color: var(--peach-dark);
}
.page-about .about-system-body {
  max-width: 40rem;
}
.page-about .about-cat-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  list-style: none;
  margin: var(--space-4) 0;
  padding: 0;
}
.page-about .about-cat-list li {
  padding: 0.5rem 1rem;
  border: 1px solid var(--peach-border);
  border-radius: 999px;
  background: var(--paper-light);
  color: var(--purple);
  font-size: 0.9375rem;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}
.page-about .about-cat-list li:hover {
  border-color: var(--gold);
  background: var(--peach-card);
  color: var(--purple);
}
.page-about .about-system-note {
  margin: var(--space-4) 0 0;
  padding: var(--space-3) var(--space-4);
  background: var(--paper);
  border-radius: var(--radius-md);
  color: var(--purple);
  opacity: 0.9;
}
.page-about .about-system-foot {
  margin-top: var(--space-5);
  padding: var(--space-3) var(--space-4);
  background: var(--purple);
  border-radius: var(--radius-md);
  color: var(--peach-light);
  font-size: 0.9375rem;
}
.page-about .about-system-foot a {
  color: var(--gold);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px dashed var(--gold);
}
.page-about .about-system-foot a:hover {
  color: var(--peach-light);
  border-bottom-style: solid;
}

.page-about .about-archive-banner {
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: var(--radius-lg);
  background: var(--peach-grad);
  box-shadow: var(--shadow-soft);
}
.page-about .about-timeline {
  position: relative;
  margin-top: var(--space-5);
  padding-left: 1.5rem;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--peach), var(--purple));
  border-radius: 999px;
}
.page-about .about-timeline-item {
  position: relative;
  margin-bottom: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background: var(--paper-light);
  border: 1px solid var(--peach-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: -1.4rem;
  top: 1.5rem;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px var(--paper);
}
.page-about .about-timeline-item:hover,
.page-about .about-timeline-item:focus-within {
  border-color: var(--peach-deep);
  box-shadow: var(--shadow-peach);
}
.page-about .about-timeline-item:focus {
  outline: 3px solid var(--gold);
  outline-offset: 2px;
}
.page-about .about-timeline-info {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}
.page-about .about-version {
  padding: 0.2rem 0.75rem;
  border-radius: 999px;
  background: var(--peach-card);
  font-family: var(--font-number);
  font-weight: 700;
  color: var(--peach-dark);
}
.page-about .about-year {
  font-size: 0.875rem;
  color: var(--purple);
  opacity: 0.7;
}
.page-about .about-timeline-desc {
  margin: 0;
  font-weight: 700;
}
.page-about .about-timeline-more {
  max-height: 0;
  margin: 0;
  overflow: hidden;
  font-size: 0.9375rem;
  color: var(--purple);
  opacity: 0;
  transition: max-height var(--transition-base), opacity var(--transition-base), margin-top var(--transition-base);
}
.page-about .about-timeline-item:hover .about-timeline-more,
.page-about .about-timeline-item:focus-within .about-timeline-more {
  max-height: 8rem;
  margin-top: var(--space-2);
  opacity: 0.9;
}
.page-about .about-archive-foot {
  margin: var(--space-5) 0 0;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--peach-card);
  color: var(--purple);
  font-size: 0.9375rem;
}
.page-about .about-archive-foot a {
  color: var(--peach-dark);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px dashed var(--peach-dark);
}
.page-about .about-archive-foot a:hover {
  color: var(--purple);
  border-bottom-style: solid;
}

.page-about .about-commitment {
  max-width: 100%;
  margin-top: var(--space-5);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  background: var(--purple-dark);
  color: var(--paper-light);
}
.page-about .about-commitment .section-title,
.page-about .about-commitment .section-desc {
  color: var(--peach-light);
}
.page-about .about-commitment .section-index {
  color: var(--gold);
}
.page-about .about-commitment-grid {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-5);
}
.page-about .about-commitment-item {
  padding: var(--space-4);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}
.page-about .about-commitment-item:hover {
  border-color: var(--gold);
  transform: translateY(-2px);
}
.page-about .about-commitment-item h3 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: 400;
  font-size: 1.25rem;
  color: var(--peach-light);
}
.page-about .about-commitment-item p {
  margin: 0;
  font-size: 0.9375rem;
  opacity: 0.9;
}
.page-about .about-commitment-note {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: space-between;
  margin-top: var(--space-5);
  padding: var(--space-3) var(--space-4);
  background: rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
}
.page-about .about-commitment-note a {
  color: var(--gold);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 1px dashed var(--gold);
}
.page-about .about-commitment-note a:hover {
  color: var(--peach-light);
  border-bottom-style: solid;
}

@media (min-width: 800px) {
  .page-about .about-story-grid {
    grid-template-columns: 0.8fr 1.2fr;
  }
  .page-about .about-system-grid {
    grid-template-columns: 0.9fr 1.1fr;
  }
  .page-about .about-commitment-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-timeline {
    padding-left: 2.5rem;
  }
  .page-about .about-timeline-item::before {
    left: -2.4rem;
  }
  .page-about .about-commitment {
    padding-left: var(--space-7);
    padding-right: var(--space-7);
  }
}