.page-about {
  --about-card-bg: #112A44;
  --about-line: #2C4C66;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
}

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.page-about .section-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--accent-cyan);
  margin: 0 0 0.5rem;
  text-transform: uppercase;
}

.page-about h2 {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 1.75rem;
  line-height: 1.2;
  margin: 0 0 1rem;
  color: var(--text-primary);
}

.page-about .about-section {
  margin-bottom: 3.5rem;
}

.page-about .fig-caption {
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  letter-spacing: 0.08em;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem 0.5rem;
  padding: 1.25rem 0 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

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

.page-about .breadcrumb a:hover {
  color: var(--accent-orange);
}

.page-about .about-hero {
  padding: 0.5rem 0 2rem;
}

.page-about .about-hero-frame {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  border: 1px solid var(--about-line);
  background: linear-gradient(135deg, #1E3A5A 0%, #0A1A2F 50%, #123A45 100%);
  padding: 1.75rem 1.5rem;
}

.page-about .about-hero-frame::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 24px;
  width: 64px;
  height: 3px;
  background: var(--accent-orange);
}

.page-about .about-hero-frame::after {
  content: "";
  position: absolute;
  right: 8px;
  bottom: 8px;
  width: 12px;
  height: 12px;
  border-right: 1px solid var(--accent-cyan);
  border-bottom: 1px solid var(--accent-cyan);
}

.page-about .about-kicker {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--accent-cyan);
  margin: 0 0 1rem;
}

.page-about .about-hero-left h1 {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 2rem;
  line-height: 1.15;
  margin: 0 0 1rem;
  color: var(--text-primary);
}

.page-about .about-lead {
  font-size: 1rem;
  color: var(--text-secondary);
  margin: 0 0 1.5rem;
  max-width: 42rem;
}

.page-about .about-hero-meta {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.page-about .about-hero-right img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(44, 76, 102, 0.5);
}

.page-about .about-archive {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  padding-top: 1rem;
  padding-bottom: 3rem;
}

.page-about .about-index {
  background: var(--about-card-bg);
  border: 1px solid var(--about-line);
  padding: 1.5rem 1.25rem;
  align-self: start;
}

.page-about .index-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.8125rem;
  color: var(--accent-cyan);
  letter-spacing: 0.1em;
  border-bottom: 1px solid var(--about-line);
  padding-bottom: 0.75rem;
  margin-bottom: 1.25rem;
}

.page-about .index-header .mono {
  font-size: 0.6875rem;
}

.page-about .index-list-compact {
  margin: 0 0 1.5rem;
  padding: 0;
}

.page-about .index-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.625rem 0;
  border-bottom: 1px solid rgba(44, 76, 102, 0.4);
  font-size: 0.875rem;
}

.page-about .index-item dt {
  color: var(--text-secondary);
}

.page-about .index-item dd {
  margin: 0;
  font-weight: 700;
  color: var(--text-primary);
}

.page-about .about-index .btn {
  display: block;
  text-align: center;
  margin-top: 1rem;
}

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

.page-about .about-who-image {
  margin: 1.75rem 0 0;
}

.page-about .about-who-image img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(44, 76, 102, 0.5);
}

.page-about .track-figure {
  margin: 0 0 2rem;
  padding: 1rem;
  border: 1px solid rgba(44, 76, 102, 0.4);
  background: rgba(17, 42, 68, 0.35);
}

.page-about .track-svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 260px;
}

.page-about .track-grid {
  stroke: rgba(44, 76, 102, 0.45);
  stroke-width: 1;
  stroke-dasharray: 2 4;
}

.page-about .track-line {
  fill: none;
  stroke: var(--accent-orange);
  stroke-width: 2;
  stroke-linecap: square;
}

.page-about .track-point {
  fill: var(--bg-primary);
  stroke: var(--accent-orange);
  stroke-width: 2.5;
}

.page-about .track-label {
  fill: var(--text-primary);
  font-size: 14px;
  font-family: var(--font-mono);
}

.page-about .track-year {
  fill: var(--text-secondary);
  font-size: 12px;
  font-family: var(--font-mono);
}

.page-about .track-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .track-item {
  margin-bottom: 0.75rem;
}

.page-about .track-details {
  border: 1px solid var(--about-line);
  background: var(--about-card-bg);
  transition: border-color var(--transition), background var(--transition);
}

.page-about .track-details:hover {
  border-color: rgba(242, 101, 34, 0.6);
}

.page-about .track-details[open] {
  border-color: rgba(46, 214, 180, 0.5);
}

.page-about .track-details summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  user-select: none;
}

.page-about .track-details summary::-webkit-details-marker {
  display: none;
}

.page-about .track-details summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--accent-orange);
  line-height: 1;
  transition: transform var(--transition);
}

.page-about .track-details[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}

.page-about .track-details .track-year {
  color: var(--accent-cyan);
  font-size: 0.8125rem;
  white-space: nowrap;
}

.page-about .track-details .track-name {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-primary);
}

.page-about .track-body {
  padding: 0 1.25rem 1.25rem;
  border-top: 1px solid rgba(44, 76, 102, 0.4);
  margin-top: 0;
}

.page-about .track-body p {
  margin: 0.875rem 0 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.page-about .about-cert {
  background: var(--bg-primary);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  padding: 3rem 0;
}

.page-about .section-desc,
.page-about .eco-lead,
.page-about .service-lead {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin: 0 0 1.75rem;
  max-width: 48rem;
}

.page-about .cert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 2rem;
}

.page-about .cert-card {
  background: var(--about-card-bg);
  border: 1px solid var(--about-line);
  padding: 1.75rem 1.5rem;
  position: relative;
  transition: border-color var(--transition);
}

.page-about .cert-card:hover {
  border-color: rgba(46, 214, 180, 0.55);
}

.page-about .cert-icon {
  color: var(--accent-cyan);
  display: block;
  margin-bottom: 1rem;
}

.page-about .cert-card:nth-child(3) .cert-icon {
  color: var(--accent-orange);
}

.page-about .cert-mark {
  font-family: var(--font-mono);
  fill: var(--text-primary);
  font-size: 9px;
}

.page-about .cert-card h3 {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1.0625rem;
  margin: 0 0 0.625rem;
  color: var(--text-primary);
}

.page-about .cert-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0 0 1rem;
}

.page-about .cert-tag {
  display: inline-block;
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
  border: 1px solid rgba(46, 214, 180, 0.35);
  padding: 0.25rem 0.625rem;
}

.page-about .cert-visual img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(44, 76, 102, 0.5);
}

.page-about .about-bottom {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.page-about .eco-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .eco-item {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 0.875rem;
  padding: 1rem 0;
  border-bottom: 1px solid rgba(44, 76, 102, 0.4);
}

.page-about .eco-item:first-child {
  border-top: 1px solid rgba(44, 76, 102, 0.4);
}

.page-about .eco-num {
  font-size: 0.8125rem;
  color: var(--accent-orange);
  padding-top: 0.25rem;
}

.page-about .eco-text h3 {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 0.9375rem;
  margin: 0 0 0.25rem;
  color: var(--text-primary);
}

.page-about .eco-text p {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin: 0;
}

.page-about .service-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.875rem;
}

.page-about .stat-card {
  background: var(--about-card-bg);
  border: 1px solid var(--about-line);
  padding: 1.25rem 1rem;
  text-align: center;
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .stat-card:hover {
  border-color: rgba(242, 101, 34, 0.55);
  transform: translateY(-2px);
}

.page-about .stat-num {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 0.375rem;
}

.page-about .stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-secondary);
  letter-spacing: 0.06em;
}

.page-about .about-cta {
  border-top: 1px solid var(--about-line);
  padding: 3rem 0;
}

.page-about .cta-inner {
  text-align: center;
}

.page-about .cta-inner > .mono {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--accent-cyan);
}

.page-about .cta-inner h2 {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 1.875rem;
  margin: 0.5rem 0 0.75rem;
}

.page-about .cta-inner p:not(.mono) {
  color: var(--text-secondary);
  margin: 0 0 1.75rem;
}

.page-about .about-ghost-link {
  display: inline-block;
  margin-left: 1rem;
  color: var(--accent-cyan);
  text-decoration: none;
  font-size: 0.9375rem;
  border-bottom: 1px solid rgba(46, 214, 180, 0.4);
  padding-bottom: 0.125rem;
  transition: border-color var(--transition);
}

.page-about .about-ghost-link:hover {
  border-color: var(--accent-cyan);
}

@media (min-width: 768px) {
  .page-about .about-hero-frame {
    grid-template-columns: 3fr 2fr;
    gap: 2rem;
    padding: 2.5rem 2rem;
  }

  .page-about .about-hero-left h1 {
    font-size: 2.5rem;
  }

  .page-about .about-archive {
    grid-template-columns: 280px 1fr;
    gap: 2.5rem;
  }

  .page-about .about-index {
    position: sticky;
    top: 1.5rem;
  }

  .page-about .about-main-content {
    padding-top: 0.25rem;
  }

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

  .page-about .cert-visual {
    margin-top: 1rem;
  }

  .page-about .about-bottom {
    grid-template-columns: 1fr 1.2fr;
    gap: 3rem;
  }

  .page-about .service-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero-frame {
    padding: 3rem 2.5rem;
    gap: 2.5rem;
  }

  .page-about .about-hero-left h1 {
    font-size: 3rem;
  }

  .page-about .about-archive {
    grid-template-columns: 300px 1fr;
    gap: 4rem;
  }

  .page-about .cert-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  .page-about .service-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-who-image img {
    max-width: 480px;
    margin-right: auto;
  }
}