.page-about {
  --about-gold: #D4AF37;
  --about-gold-lite: #E8CC68;
  --about-emerald: #00A86B;
  --about-ivory: #F5F0E6;
  --about-slate: #9CA3AF;
  --about-bg: #0A0A0A;
  --about-panel: #151515;
  --about-line: rgba(212, 175, 55, 0.26);
  --about-line-soft: rgba(212, 175, 55, 0.12);
  --about-text: rgba(245, 240, 230, 0.92);
  --about-muted: rgba(245, 240, 230, 0.6);
  background-color: var(--about-bg);
  color: var(--about-text);
  overflow-x: hidden;
}
.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}
.page-about .breadcrumbs-item a {
  color: rgba(245, 240, 230, 0.72);
  text-decoration: none;
  transition: color 0.2s ease;
}
.page-about .breadcrumbs-item a:hover,
.page-about .breadcrumbs-item a:focus-visible {
  color: var(--about-gold-lite);
}
.page-about .breadcrumbs-item[aria-current="page"] {
  color: var(--about-gold);
}
.page-about .breadcrumbs-sep {
  color: var(--about-gold);
  opacity: 0.6;
}
.page-about .chapter-header {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--about-line);
  padding-bottom: 14px;
}
.page-about .chapter-number {
  font-family: var(--font-serif);
  font-size: 44px;
  line-height: 1;
  font-weight: 700;
  color: var(--about-gold);
  opacity: 0.9;
  flex-shrink: 0;
  min-width: 60px;
}
.page-about__chapter-text h2 {
  font-family: var(--font-serif);
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.25;
  color: var(--about-ivory);
  margin: 4px 0 0;
}
.page-about .section-label {
  color: var(--about-gold);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 12px;
  font-weight: 600;
  margin: 0;
}
.page-about .panel-chamfer {
  background: var(--about-panel);
  border: 1px solid var(--about-line-soft);
  border-radius: var(--radius-chamfer);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}
.page-about .expand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border: 1px solid var(--about-gold);
  border-radius: 50%;
  color: var(--about-gold);
  font-size: 14px;
  line-height: 1;
  transition: transform 0.3s ease, background-color 0.3s ease, color 0.3s ease;
  margin-left: 8px;
}
.page-about .expand-trigger[aria-expanded="true"] .expand-icon {
  transform: rotate(45deg);
  background-color: var(--about-gold);
  color: #0A0A0A;
}
.page-about .expand-panel {
  display: none;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, opacity 0.4s ease;
  opacity: 0;
}
.page-about .expand-panel.is-expanded {
  display: block;
  max-height: 600px;
  opacity: 1;
}
.page-about .expand-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 13px;
  color: var(--about-gold-lite);
  cursor: pointer;
  letter-spacing: 0.04em;
  transition: color 0.2s ease;
}
.page-about .expand-trigger:hover,
.page-about .expand-trigger:focus-visible {
  color: var(--about-ivory);
}
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 4px 16px 16px 16px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.3s ease, background-color 0.2s ease;
}
.page-about .btn-gold {
  background: linear-gradient(135deg, #D4AF37 0%, #E8CC68 45%, #B8962E 100%);
  color: #0A0A0A;
  box-shadow: 0 4px 24px rgba(212, 175, 55, 0.16);
}
.page-about .btn-gold:hover,
.page-about .btn-gold:focus-visible {
  box-shadow: 0 6px 32px rgba(212, 175, 55, 0.28);
  transform: translateY(-2px);
}
.page-about .btn-outline {
  border-color: var(--about-gold);
  color: var(--about-gold);
  background: transparent;
}
.page-about .btn-outline:hover,
.page-about .btn-outline:focus-visible {
  background: rgba(212, 175, 55, 0.08);
  color: var(--about-gold-lite);
  transform: translateY(-2px);
}
.page-about .btn-arrow::after {
  content: "→";
  transition: transform 0.2s ease;
}
.page-about .btn-arrow:hover::after {
  transform: translateX(3px);
}
.page-about .image-frame {
  background: var(--about-panel);
  border: 1px solid var(--about-line-soft);
  border-radius: 4px 20px 20px 20px;
  overflow: hidden;
  margin: 0;
}
.page-about .image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .image-frame.is-square img {
  aspect-ratio: 1 / 1;
}
.page-about .frame-caption {
  padding: 10px 14px;
  background: rgba(10, 10, 10, 0.72);
  color: rgba(245, 240, 230, 0.64);
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  border-top: 1px solid var(--about-line-soft);
}

.page-about__hero {
  position: relative;
  padding: 40px 0 36px;
  background:
    linear-gradient(135deg, transparent 62%, rgba(212, 175, 55, 0.06) 62.5%, transparent 64%),
    linear-gradient(315deg, transparent 84%, rgba(212, 175, 55, 0.04) 84.5%, transparent 86%),
    var(--about-bg);
  border-bottom: 1px solid var(--about-line-soft);
}
.page-about__hero-decor {
  display: none;
}
.page-about__hero-inner {
  position: relative;
}
.page-about__hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(30px, 5.4vw, 52px);
  line-height: 1.14;
  color: var(--about-ivory);
  margin: 12px 0 16px;
  max-width: 720px;
}
.page-about__hero-desc {
  max-width: 620px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-muted);
  border-left: 3px solid var(--about-gold);
  padding-left: 16px;
  margin: 0;
}

.page-about__layout {
  display: block;
  padding-top: 24px;
  padding-bottom: 28px;
}
.page-about__index {
  margin-bottom: 32px;
}
.page-about__index-sticky {
  position: static;
  background: rgba(21, 21, 21, 0.55);
  border: 1px solid var(--about-line-soft);
  border-radius: 4px 20px 20px 20px;
  padding: 20px 18px;
}
.page-about__index-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}
.page-about__index-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 15px;
  color: rgba(245, 240, 230, 0.78);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about__index-list a span {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--about-gold);
  font-size: 14px;
}
.page-about__index-list a:hover,
.page-about__index-list a:focus-visible {
  color: var(--about-ivory);
  border-bottom-color: var(--about-gold);
}
.page-about__index-card {
  margin-top: 20px;
  padding: 16px 18px;
}
.page-about__index-card p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--about-muted);
}

.page-about__content {
  min-width: 0;
}
.page-about__origin-grid {
  display: block;
}
.page-about__origin-copy p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(245, 240, 230, 0.82);
}
.page-about__origin-copy strong {
  color: var(--about-gold-lite);
  font-weight: 600;
}
.page-about__quote {
  margin: 20px 0 0;
  padding: 14px 16px;
  border-left: 3px solid var(--about-gold);
  background: rgba(212, 175, 55, 0.06);
  border-radius: 0 14px 14px 14px;
}
.page-about__quote p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.6;
  color: var(--about-ivory);
}
.page-about__origin-figure {
  margin: 24px 0 0;
  border-radius: 4px 20px 20px 20px;
  overflow: hidden;
  border: 1px solid var(--about-line-soft);
  background: var(--about-panel);
}
.page-about__origin-figure img {
  width: 100%;
  height: auto;
}

.page-about__timeline-figure {
  margin: 0 0 28px;
  border-radius: 4px 20px 20px 20px;
  overflow: hidden;
  border: 1px solid var(--about-line-soft);
  background: var(--about-panel);
}
.page-about__timeline-figure img {
  width: 100%;
  height: auto;
}
.page-about__timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about__timeline-item {
  position: relative;
  margin-bottom: 22px;
}
.page-about__timeline-marker {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}
.page-about__timeline-version {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--about-gold);
  line-height: 1.1;
}
.page-about__timeline-year {
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--about-slate);
}
.page-about__timeline-marker--current .page-about__timeline-version {
  color: var(--about-emerald);
}
.page-about__timeline-marker--current .page-about__timeline-year {
  color: var(--about-emerald);
}
.page-about__timeline-card {
  padding: 16px 16px 14px;
}
.page-about__timeline-card h3 {
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.35;
  color: var(--about-ivory);
  margin: 0 0 6px;
}
.page-about__timeline-card p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 240, 230, 0.72);
}
.page-about__timeline-toggle {
  display: inline-flex;
  align-items: center;
  padding: 4px 0;
}
.page-about__timeline-detail {
  margin-top: 10px;
  padding: 12px 14px;
  background: rgba(212, 175, 55, 0.05);
  border: 1px solid var(--about-line-soft);
  border-radius: 0 14px 14px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(245, 240, 230, 0.68);
}
.page-about__timeline-detail p {
  margin: 0;
}

.page-about__capability-layout {
  display: block;
}
.page-about__capability-lead {
  padding: 20px 18px;
  margin-bottom: 16px;
}
.page-about__capability-lead p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.8;
  color: rgba(245, 240, 230, 0.82);
}
.page-about__capability-metrics {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line-soft);
}
.page-about__capability-metrics li {
  background: var(--about-panel);
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
}
.page-about__metric-num {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--about-gold);
  margin-bottom: 6px;
}
.page-about__metric-label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--about-muted);
}
.page-about__capability-security {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: rgba(0, 168, 107, 0.06);
  border: 1px solid rgba(0, 168, 107, 0.22);
  border-radius: 4px 20px 20px 20px;
}
.page-about__security-mark {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--about-emerald);
  border: 1px solid rgba(0, 168, 107, 0.4);
  border-radius: 50%;
  font-size: 20px;
}
.page-about__capability-security h3 {
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--about-ivory);
  margin: 0 0 4px;
}
.page-about__capability-security p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(245, 240, 230, 0.7);
}

.page-about__honor-intro {
  display: block;
  margin-bottom: 24px;
}
.page-about__honor-figure {
  max-width: 320px;
  margin: 0 0 16px;
}
.page-about__honor-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-muted);
}
.page-about__honor-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}
.page-about__honor-card {
  perspective: 1000px;
}
.page-about__honor-card-inner {
  position: relative;
  min-height: 168px;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
.page-about__honor-card:hover .page-about__honor-card-inner,
.page-about__honor-card:focus-within .page-about__honor-card-inner {
  transform: rotateY(180deg);
}
.page-about__honor-front,
.page-about__honor-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 16px 14px;
  text-align: center;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-chamfer);
  background: var(--about-panel);
}
.page-about__honor-front {
  gap: 8px;
}
.page-about__honor-back {
  transform: rotateY(180deg);
  background: linear-gradient(145deg, #151515 0%, #1e1e1e 100%);
  border-color: var(--about-gold);
}
.page-about__honor-back p {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: rgba(245, 240, 230, 0.78);
}
.page-about__honor-mark {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--about-gold);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  height: 46px;
  padding: 0 8px;
  border: 1px solid var(--about-line);
  border-radius: 50%;
}
.page-about__honor-front h3 {
  font-family: var(--font-serif);
  font-size: 16px;
  color: var(--about-ivory);
  margin: 0;
}
.page-about__honor-bottom {
  padding-top: 4px;
}
.page-about__honor-bottom p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-muted);
}
.page-about__honor-bottom a {
  color: var(--about-gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(212, 175, 55, 0.4);
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about__honor-bottom a:hover,
.page-about__honor-bottom a:focus-visible {
  color: var(--about-gold-lite);
  border-color: var(--about-gold-lite);
}

@media (max-width: 767px) {
  .page-about__capability-metrics {
    grid-template-columns: 1fr 1fr;
  }
  .page-about__honor-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-about__honor-card:nth-child(odd) {
    margin-right: 0;
  }
}

@media (min-width: 768px) {
  .page-about__hero {
    padding: 52px 0 44px;
  }
  .page-about__origin-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    align-items: center;
  }
  .page-about__origin-figure {
    margin: 0;
  }
  .page-about__timeline-figure {
    max-width: 100%;
  }
  .page-about__capability-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
  .page-about__capability-lead {
    margin-bottom: 0;
  }
  .page-about__honor-intro {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 28px;
    align-items: center;
  }
  .page-about__honor-figure {
    margin: 0;
  }
  .page-about__honor-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
}

@media (min-width: 992px) {
  .page-about__hero-decor {
    display: block;
    position: absolute;
    right: 8%;
    top: 50%;
    transform: translateY(-50%);
    width: 140px;
    height: 140px;
    border: 1px solid rgba(212, 175, 55, 0.28);
    border-radius: 50%;
    pointer-events: none;
  }
  .page-about__hero-decor::before {
    content: "";
    position: absolute;
    inset: 16px;
    border: 1px dashed rgba(212, 175, 55, 0.18);
    border-radius: 50%;
  }
  .page-about__hero-decor::after {
    content: "";
    position: absolute;
    left: 50%;
    top: -16px;
    height: 172px;
    width: 1px;
    background: linear-gradient(to bottom, transparent, rgba(212, 175, 55, 0.5));
    transform: rotate(38deg);
  }
  .page-about__layout {
    display: grid;
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 48px;
    padding-top: 40px;
    padding-bottom: 52px;
    align-items: start;
  }
  .page-about__index {
    margin-bottom: 0;
  }
  .page-about__index-sticky {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    max-height: calc(100vh - var(--header-h) - 56px);
    overflow-y: auto;
  }
  .page-about__index-list {
    display: flex;
    flex-direction: column;
    gap: 0;
  }
  .page-about__index-list a {
    width: 100%;
  }
  .page-about__honor-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .expand-panel,
  .page-about .expand-icon,
  .page-about .btn,
  .page-about .honor-inner,
  .page-about__honor-card-inner {
    transition: none;
  }
  .page-about .btn:hover {
    transform: none;
  }
}