.page-about {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: linear-gradient(180deg, var(--c-space) 0%, #0C1830 50%, var(--c-space) 100%);
}

.page-about::before {
  content: '';
  position: fixed;
  top: -80px;
  left: -80px;
  right: -80px;
  bottom: -80px;
  z-index: 1;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(139, 92, 246, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 92, 246, 0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  transform: skewX(-7deg);
}

.page-about > * {
  position: relative;
  z-index: 2;
}

.page-about .page-breadcrumb {
  max-width: calc(var(--container) - 48px);
  margin: 0 auto;
  padding-top: 24px;
}

.page-about .story-hero {
  position: relative;
  max-width: calc(var(--container) - 48px);
  margin: 36px auto 44px;
  padding: 44px 24px 38px;
  background:
    linear-gradient(135deg, rgba(139, 92, 246, 0.16) 0%, transparent 42%),
    linear-gradient(180deg, rgba(16, 30, 58, 0.82) 0%, rgba(10, 17, 40, 0.72) 100%);
  border: 2px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.page-about .story-hero::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  width: 40px;
  height: 40px;
  border-top: 3px solid var(--c-green);
  border-left: 3px solid var(--c-green);
}

.page-about .story-hero::after {
  content: '';
  position: absolute;
  right: -2px;
  bottom: -2px;
  width: 40px;
  height: 40px;
  border-right: 3px solid var(--c-purple);
  border-bottom: 3px solid var(--c-purple);
}

.page-about .story-hero__note {
  position: absolute;
  top: 14px;
  right: 16px;
  writing-mode: vertical-rl;
  font-family: var(--f-heading);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  line-height: 1.6;
  color: var(--c-mist);
  padding: 14px 8px;
  border-left: 1px dashed var(--c-border);
  white-space: nowrap;
}

.page-about .story-hero__kicker {
  margin: 0 0 10px;
  font-family: var(--f-heading);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-green);
}

.page-about .story-hero h1 {
  margin: 0;
  max-width: 15em;
  font-family: var(--f-heading);
  font-size: clamp(28px, 4vw, 46px);
  font-weight: 900;
  line-height: 1.16;
  color: var(--c-white);
}

.page-about .story-hero__lead {
  max-width: 720px;
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-mist);
}

.page-about .story-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .story-toc {
  max-width: calc(var(--container) - 48px);
  margin: 0 auto 56px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  border-top: 1px dashed var(--c-border);
  border-bottom: 1px dashed var(--c-border);
}

.page-about .story-toc a {
  position: relative;
  padding: 10px 0;
  font-family: var(--f-heading);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-mist);
  text-decoration: none;
  transition: color var(--ease);
}

.page-about .story-toc a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--c-green);
  transition: width var(--ease);
}

.page-about .story-toc a:hover,
.page-about .story-toc a:focus-visible {
  color: var(--c-green);
}

.page-about .story-toc a:hover::after,
.page-about .story-toc a:focus-visible::after {
  width: 100%;
}

.page-about .section-label {
  margin-bottom: 18px;
}

.page-about .origin-section,
.page-about .milestone-section,
.page-about .adaptation-section,
.page-about .belief-section {
  margin-bottom: 88px;
}

.page-about .origin-grid {
  display: grid;
  gap: 32px;
  margin-top: 28px;
}

.page-about .origin-copy h2,
.page-about .milestone-head h2,
.page-about .adaptation-copy h2,
.page-about .belief-copy h2 {
  margin: 0 0 18px;
  font-family: var(--f-heading);
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--c-white);
}

.page-about .origin-copy p,
.page-about .milestone-head p,
.page-about .adaptation-copy p,
.page-about .belief-copy p {
  margin: 0 0 16px;
  color: var(--c-mist);
  line-height: 1.7;
}

.page-about .check-list {
  list-style: none;
  margin: 24px 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .check-list li {
  position: relative;
  padding-left: 30px;
  color: var(--c-mist);
  line-height: 1.7;
}

.page-about .check-list li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 8px;
  width: 14px;
  height: 8px;
  border-left: 3px solid var(--c-green);
  border-bottom: 3px solid var(--c-green);
  transform: rotate(-45deg);
}

.page-about .origin-media,
.page-about .belief-media {
  margin: 0;
  padding: 10px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: rgba(16, 30, 58, 0.62);
  box-shadow: var(--shadow);
}

.page-about .origin-media img,
.page-about .belief-media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: calc(var(--radius) - 2px);
}

.page-about .milestone-section {
  position: relative;
}

.page-about .milestone-section::before {
  content: 'V3.2.1';
  position: absolute;
  right: -6px;
  top: 100px;
  z-index: 0;
  font-family: var(--f-heading);
  font-size: clamp(120px, 16vw, 260px);
  font-weight: 900;
  line-height: 1;
  pointer-events: none;
  color: rgba(139, 92, 246, 0.08);
}

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

.page-about .milestone-head {
  max-width: 760px;
}

.page-about .milestone-map {
  margin: 28px 0 36px;
  padding: 12px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: rgba(16, 30, 58, 0.55);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.2);
}

.page-about .milestone-map img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: calc(var(--radius) - 2px);
}

.page-about .timeline {
  position: relative;
  margin-top: 36px;
  padding-left: 30px;
}

.page-about .timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 3px;
  background: linear-gradient(180deg, var(--c-green) 0%, var(--c-purple) 55%, rgba(139, 92, 246, 0.16) 100%);
}

.page-about .timeline-item {
  position: relative;
  margin-bottom: 28px;
}

.page-about .timeline-item::before {
  content: '';
  position: absolute;
  left: -27px;
  top: 22px;
  z-index: 1;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--c-space);
  border: 3px solid var(--c-green);
  box-shadow: 0 0 0 3px rgba(0, 255, 136, 0.14);
}

.page-about .timeline-meta {
  margin-bottom: 10px;
}

.page-about .timeline-meta__year {
  display: block;
  font-family: var(--f-heading);
  font-size: 30px;
  font-weight: 900;
  line-height: 1.15;
  color: var(--c-white);
}

.page-about .timeline-meta__label {
  display: block;
  margin-top: 3px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--c-green);
}

.page-about .timeline-event {
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: rgba(16, 30, 58, 0.82);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.22);
  transition: border-color var(--ease), transform var(--ease);
}

.page-about .timeline-event:hover,
.page-about .timeline-event:focus-within {
  border-color: var(--c-purple);
  transform: translateY(-2px);
}

.page-about .timeline-event > summary {
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 16px 18px;
  cursor: pointer;
  font-family: var(--f-heading);
  font-size: 17px;
  font-weight: 700;
  color: var(--c-white);
}

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

.page-about .timeline-event > summary::after {
  content: '+';
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border: 1px solid var(--c-purple);
  border-radius: 50%;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-purple);
  transition: background var(--ease), color var(--ease);
}

.page-about .timeline-event[open] > summary::after {
  content: '−';
  background: var(--c-purple);
  color: var(--c-white);
}

.page-about .timeline-event__badge {
  flex: 0 0 auto;
  margin-left: auto;
  font-family: var(--f-body);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-space);
  background: var(--c-green);
  padding: 3px 8px;
  border-radius: 2px;
  white-space: nowrap;
}

.page-about .timeline-event__content {
  padding: 4px 18px 18px;
  border-top: 1px dashed var(--c-border);
  color: var(--c-mist);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .timeline-event__content p {
  margin: 12px 0 0;
}

.page-about .timeline-event__content ul {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .timeline-event__content li {
  position: relative;
  padding-left: 20px;
}

.page-about .timeline-event__content li::before {
  content: '›';
  position: absolute;
  left: 2px;
  font-weight: 700;
  color: var(--c-green);
}

.page-about .milestone-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 32px;
}

.page-about .adaptation-grid {
  display: grid;
  gap: 36px;
  margin-top: 28px;
}

.page-about .stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 0;
  padding: 0;
}

.page-about .stat-cell {
  padding: 24px 14px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  background: rgba(16, 30, 58, 0.78);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
  text-align: center;
}

.page-about .stat-cell dt {
  font-family: var(--f-heading);
  font-size: 42px;
  font-weight: 900;
  line-height: 1.1;
  color: var(--c-green);
}

.page-about .stat-cell dd {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--c-mist);
}

.page-about .belief-grid {
  display: grid;
  gap: 32px;
  margin-top: 28px;
}

@media (min-width: 768px) {
  .page-about .timeline {
    padding-left: 0;
  }

  .page-about .timeline::before {
    left: 200px;
  }

  .page-about .timeline-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 32px;
  }

  .page-about .timeline-item::before {
    left: 193px;
  }

  .page-about .timeline-meta {
    position: sticky;
    top: 96px;
    align-self: start;
    margin-bottom: 0;
    padding-top: 18px;
    text-align: right;
  }
}

@media (min-width: 900px) {
  .page-about .origin-grid {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
  }

  .page-about .adaptation-grid {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
  }

  .page-about .belief-grid {
    grid-template-columns: 380px 1fr;
    gap: 56px;
    align-items: center;
  }

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