.page-about {
  --about-index-w: 280px;
  --about-cols-gap: 3rem;
  --about-timeline-line: 2px;
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.75;
}

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

.page-about .about-context {
  padding-top: calc(var(--header-h) + 1rem);
  padding-bottom: 0.5rem;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--ink-muted);
}

.page-about .breadcrumb a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease-fast), border-color var(--ease-fast);
}

.page-about .breadcrumb a:hover {
  color: var(--red);
  border-color: var(--red);
}

.page-about .about-shell {
  padding-bottom: var(--sp-xl);
}

.page-about .about-index {
  margin-block: 1.25rem 2rem;
  padding: 1.25rem;
  background: var(--cream-deep);
  border: 1px solid var(--ink);
}

.page-about .about-index-head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--ink);
  margin-bottom: 1rem;
}

.page-about .brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--red);
  color: #fff;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-style: italic;
  flex: none;
}

.page-about .about-index-title {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.page-about .about-index-kicker {
  font-family: var(--font-heading);
  font-size: var(--text-md);
  font-weight: 700;
  font-style: italic;
  letter-spacing: 0.04em;
}

.page-about .about-index-en {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: about-index;
}

.page-about .about-index-list li + li {
  border-top: 1px solid var(--cream-deep);
}

.page-about .about-index-list a {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.9rem 0.25rem;
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  border-left: 3px solid transparent;
  transition: border-color var(--ease-fast), color var(--ease-fast), background-color var(--ease-fast);
}

.page-about .about-index-list a:hover,
.page-about .about-index-list a:focus-visible {
  color: var(--red);
  border-left-color: var(--red);
  background: var(--red-soft);
}

.page-about .about-index-num {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--ink-muted);
  min-width: 2.2em;
}

.page-about .about-index-list a:hover .about-index-num {
  color: var(--red-card);
}

.page-about .about-index-shortcut {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
  flex-wrap: wrap;
}

.page-about .shortcut-dot {
  width: 0.65rem;
  height: 0.65rem;
  flex: none;
  display: inline-block;
}

.page-about .dot-red {
  background: var(--red);
}

.page-about .dot-blue {
  background: var(--dark-blue);
}

.page-about .shortcut-sep {
  width: 1px;
  height: 0.875rem;
  background: var(--ink-muted);
  opacity: 0.5;
}

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

.page-about .about-section {
  padding-block: var(--sp-lg) var(--sp-md);
}

.page-about .about-section-label {
  display: inline-block;
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--red);
  text-transform: uppercase;
}

.page-about .about-title {
  margin: 0 0 0.25rem;
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3rem);
  font-style: italic;
  line-height: 1.05;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.page-about .about-title--light {
  color: #fff;
}

.page-about .about-section-head--light .about-section-label {
  color: var(--gold);
}

.page-about .about-tagline {
  margin: 0 0 1.5rem;
  font-family: var(--font-heading);
  font-size: clamp(1.25rem, 3vw, 2rem);
  font-style: italic;
  color: var(--red);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.page-about .about-mission {
  border-left: 6px solid var(--red);
  padding-left: 1.25rem;
  margin-top: 1rem;
}

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

.page-about .about-mission-lead {
  font-size: var(--text-md);
  font-weight: 600;
  margin: 0;
}

.page-about .about-mission-body p + p {
  margin-top: 1rem;
}

.page-about .about-mission-body {
  font-size: var(--text-base);
}

.page-about .about-mission-note {
  margin-top: 1.25rem;
  padding: 0.875rem 1rem;
  background: var(--green-soft);
  border-left: 3px solid var(--green);
  font-size: var(--text-sm);
  color: var(--ink);
}

.page-about .about-mission-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--cream-deep);
}

.page-about .about-mission-tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--ink-muted);
  letter-spacing: 0.06em;
}

.page-about .about-timeline {
  position: relative;
  background: var(--dark-blue);
  color: rgba(255, 255, 255, 0.92);
  border-top: 4px solid var(--red);
  border-bottom: 4px solid var(--red);
  overflow: hidden;
}

.page-about .about-timeline-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.page-about .about-timeline-bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.25;
}

.page-about .about-timeline-inner {
  position: relative;
  z-index: 1;
  padding: var(--sp-lg) 0;
}

.page-about .about-timeline-list {
  list-style: none;
  margin: var(--sp-lg) 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline-list::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 1.1rem;
  width: var(--about-timeline-line);
  background: linear-gradient(to bottom, var(--red) 0%, var(--gold) 45%, rgba(255, 255, 255, 0.15) 100%);
  transform: skewX(-12deg);
  transform-origin: top;
}

.page-about .about-timeline-item {
  position: relative;
  padding-left: 3.5rem;
  padding-bottom: 1.75rem;
}

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

.page-about .about-timeline-year {
  position: absolute;
  left: 0;
  top: 0;
  width: 2.6rem;
  height: 2.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--red);
  color: #fff;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1;
  z-index: 1;
  clip-path: polygon(0 0, 100% 0, 100% 72%, 82% 100%, 0 100%);
  transition: background-color var(--ease-fast), transform var(--ease-fast);
}

.page-about .about-timeline-item:hover .about-timeline-year {
  background: var(--red-card);
  transform: translateX(3px);
}

.page-about .about-timeline-card {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-left: 3px solid var(--gold);
  padding: 1rem 1.25rem 1.25rem;
  transition: background-color var(--ease-fast), border-color var(--ease-fast), transform var(--ease-fast);
}

.page-about .about-timeline-item:hover .about-timeline-card {
  background: rgba(255, 255, 255, 0.12);
  border-left-color: var(--red);
  transform: translateX(4px);
}

.page-about .about-timeline-card h3 {
  margin: 0 0 0.5rem;
  font-size: var(--text-md);
  font-weight: 700;
  color: #fff;
}

.page-about .about-timeline-card p {
  margin: 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-timeline-index {
  display: inline-block;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--gold);
  letter-spacing: 0.12em;
}

.page-about .about-data-grid {
  display: grid;
  gap: 1.75rem;
  margin-top: 1.75rem;
}

.page-about .about-data-copy p {
  margin: 0 0 1rem;
}

.page-about .about-data-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.page-about .about-data-note {
  border-left: 3px solid var(--gold);
  padding-left: 0.75rem;
  background: var(--cream-deep);
  padding: 0.75rem 1rem;
  font-size: var(--text-sm);
}

.page-about .about-data-figure {
  margin: 0;
  padding: 0.5rem;
  border: 1px solid var(--ink);
  background: var(--cream-deep);
}

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

.page-about .about-stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--ink);
  border: 1px solid var(--ink);
  margin-top: 1.75rem;
}

.page-about .about-stat {
  background: var(--cream);
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 8.5rem;
  transition: background-color var(--ease-fast);
}

.page-about .about-stat:hover {
  background: var(--cream-deep);
}

.page-about .about-stat .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--red);
  word-break: keep-all;
}

.page-about .about-stat .stat-label {
  margin-top: 0.375rem;
  font-size: var(--text-sm);
  color: var(--ink-muted);
  letter-spacing: 0.04em;
}

.page-about .about-tech-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.75rem;
}

.page-about .about-tech-card {
  position: relative;
  padding: 1.5rem 1.25rem;
  background: var(--cream-deep);
  border-top: 3px solid var(--red);
  border-right: 1px solid var(--ink-muted);
  border-bottom: 1px solid var(--ink-muted);
  border-left: 1px solid var(--ink-muted);
  transition: background-color var(--ease-fast), border-top-color var(--ease-fast), transform var(--ease-fast);
}

.page-about .about-tech-card:hover {
  background: var(--cream);
  border-top-color: var(--gold);
  transform: translateY(-3px);
}

.page-about .about-tech-num {
  display: inline-block;
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--red-card);
  letter-spacing: 0.12em;
}

.page-about .about-tech-card h3 {
  margin: 0 0 0.625rem;
  font-size: var(--text-md);
  font-weight: 700;
}

.page-about .about-tech-card p {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--ink-muted);
  line-height: 1.7;
}

.page-about .about-community-grid {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-community-copy p {
  margin: 0 0 1rem;
}

.page-about .about-community-leagues {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
  margin-bottom: 1.5rem;
}

.page-about .about-community-leagues span {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  border: 1px solid var(--ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  background: var(--cream-deep);
  color: var(--ink);
  transition: background-color var(--ease-fast), color var(--ease-fast);
}

.page-about .about-community-leagues span:hover {
  background: var(--ink);
  color: var(--cream);
}

.page-about .about-community-figure {
  margin: 0;
  padding: 0.5rem;
  border: 1px solid var(--ink);
  background: var(--cream-deep);
}

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

.page-about .about-pulse {
  background: var(--dark-blue);
  color: rgba(255, 255, 255, 0.85);
  padding: var(--sp-xl) 1.25rem var(--sp-lg);
  text-align: center;
  border-top: 4px solid var(--red);
}

.page-about .about-pulse-svg {
  display: block;
  width: min(100%, 800px);
  height: auto;
  margin: 0 auto 1.25rem;
  overflow: visible;
}

.page-about .about-pulse-path {
  fill: none;
  stroke: var(--red);
  stroke-width: 2.5;
  stroke-linecap: square;
  stroke-dasharray: 6 6;
  animation: about-pulse-dash 1.6s linear infinite;
  transition: stroke var(--ease-fast);
}

.page-about .about-pulse-svg:hover .about-pulse-path {
  stroke: var(--gold);
}

.page-about .about-pulse-range {
  display: flex;
  justify-content: center;
  align-items: baseline;
  gap: 1rem;
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  color: var(--gold);
  letter-spacing: 0.12em;
}

.page-about .about-pulse-divider {
  color: rgba(255, 255, 255, 0.4);
}

.page-about .about-pulse-caption {
  margin: 0.75rem 0 0;
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.65);
}

.page-about [data-reveal] {
  transition: opacity var(--ease-slow), transform var(--ease-slow);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@keyframes about-pulse-dash {
  to {
    stroke-dashoffset: -24;
  }
}

@media (min-width: 960px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, var(--about-cols-gap));
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
    margin-top: 1.5rem;
  }

  .page-about .about-section {
    padding-block: calc(var(--sp-lg) + 1rem) var(--sp-lg);
  }

  .page-about .about-section:first-child {
    padding-top: var(--sp-lg);
  }

  .page-about .about-mission {
    border-left-width: 8px;
    padding-left: 2.5rem;
  }

  .page-about .about-mission-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 2.5rem;
  }

  .page-about .about-timeline-list {
    margin-top: var(--sp-xl);
  }

  .page-about .about-data-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    gap: 2.5rem;
    align-items: center;
  }

  .page-about .about-stat-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-tech-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
    margin-top: 2rem;
  }

  .page-about .about-community-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.75fr);
    gap: 3rem;
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-pulse-path {
    animation: none;
  }

  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: opacity var(--ease-fast);
  }

  .page-about .about-timeline-year,
  .page-about .about-timeline-card,
  .page-about .about-tech-card {
    transform: none;
  }
}