.page-about {
  --about-green: var(--color-green);
  --about-blue: var(--color-blue);
  --about-gold: var(--color-gold);
  --about-red: var(--color-red-orange);
  --about-slate: var(--color-slate);
  --about-cream: var(--color-cream);
  --about-ink: var(--color-ink);
  --about-light-green: var(--color-light-green);
  background-color: var(--about-cream);
  color: var(--about-ink);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
}

.page-about .image-field {
  width: 100%;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--about-blue);
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition: none !important;
    animation: none !important;
  }
}

.page-about .about-hero {
  position: relative;
  background: linear-gradient(135deg, rgba(26, 58, 92, 0.97) 0%, rgba(26, 58, 92, 0.88) 55%, rgba(31, 110, 92, 0.78) 100%);
  color: #ffffff;
  padding: 3.5rem 1.25rem 3rem;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.06) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.06) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
}

.page-about .about-hero .breadcrumbs {
  font-family: var(--font-index);
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 2.5rem;
}

.page-about .about-hero .breadcrumbs a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  transition: color 0.2s;
}

.page-about .about-hero .breadcrumbs a:hover {
  color: var(--about-gold);
}

.page-about .about-hero-code {
  font-family: var(--font-index);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--about-gold);
  margin-bottom: 0.75rem;
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  margin: 0 0 1rem;
}

.page-about .about-hero-lead {
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.85);
  max-width: 36rem;
  margin: 0 0 2rem;
}

.page-about .about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-hero-meta-item {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius);
  padding: 0.625rem 1rem;
  display: flex;
  flex-direction: column;
}

.page-about .about-hero-meta-num {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--about-gold);
  line-height: 1.2;
}

.page-about .about-hero-meta-tag {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.75);
}

.page-about .about-hero-coord {
  position: absolute;
  right: 1.25rem;
  bottom: 1rem;
  font-family: var(--font-index);
  font-size: 0.6875rem;
  color: rgba(255, 255, 255, 0.45);
  display: none;
}

.page-about .chapter {
  padding: 3.5rem 1.25rem;
  max-width: 1200px;
  margin: 0 auto;
  border-bottom: 1px solid rgba(42, 42, 38, 0.08);
}

.page-about .chapter-head {
  display: flex;
  flex-direction: column;
  margin-bottom: 2.5rem;
}

.page-about .chapter-index {
  font-family: var(--font-index);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--about-red);
  margin-bottom: 0.5rem;
}

.page-about .chapter-title {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--about-ink);
  margin-bottom: 0.5rem;
}

.page-about .chapter-sub {
  color: var(--about-slate);
  font-size: 0.9375rem;
  line-height: 1.7;
  max-width: 40rem;
}

.page-about .about-history-layout {
  display: grid;
  gap: 2rem;
}

.page-about .about-history-side {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about .about-history-logo {
  aspect-ratio: 2 / 1;
  border: 1px solid rgba(42, 42, 38, 0.12);
  box-shadow: var(--shadow);
}

.page-about .about-history-logo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-history-side-note {
  font-size: 0.875rem;
  color: var(--about-slate);
  line-height: 1.7;
}

.page-about .about-timeline {
  position: relative;
  padding-left: 2rem;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0.45rem;
  top: 0.25rem;
  bottom: 0.25rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--about-green), var(--about-light-green));
  opacity: 0.35;
  border-radius: 2px;
}

.page-about .about-timeline-item {
  position: relative;
  margin-bottom: 1.5rem;
}

.page-about .about-timeline-marker {
  position: absolute;
  left: -1.55rem;
  top: 0.35rem;
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 50%;
  background: var(--about-gold);
  border: 2px solid var(--about-cream);
  box-shadow: 0 0 0 2px rgba(201, 162, 39, 0.25);
}

.page-about .about-timeline-card {
  background: #ffffff;
  border: 1px solid rgba(42, 42, 38, 0.08);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
}

.page-about .about-timeline-year {
  display: inline-block;
  font-family: var(--font-index);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--about-green);
  background: rgba(31, 110, 92, 0.1);
  border-radius: 999px;
  padding: 0.25rem 0.75rem;
  margin-bottom: 0.5rem;
}

.page-about .about-timeline-card h3 {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
}

.page-about .about-timeline-card details {
  margin-top: 0.5rem;
  border-top: 1px dashed rgba(42, 42, 38, 0.1);
  padding-top: 0.5rem;
}

.page-about .about-timeline-card summary {
  cursor: pointer;
  list-style: none;
  font-size: 0.875rem;
  color: var(--about-blue);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

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

.page-about .about-timeline-card summary::before {
  content: "+";
  font-family: var(--font-index);
  font-size: 0.875rem;
  color: var(--about-gold);
  transition: transform 0.2s;
}

.page-about .about-timeline-card details[open] summary::before {
  transform: rotate(45deg);
}

.page-about .about-timeline-card details p {
  margin: 0.625rem 0 0;
  font-size: 0.875rem;
  color: var(--about-slate);
  line-height: 1.6;
}

.page-about .about-data-layout {
  display: grid;
  gap: 2rem;
}

.page-about .about-data-panel {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--about-blue);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 2rem;
}

.page-about .about-data-stat {
  background: var(--about-blue);
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  text-align: center;
  transition: background 0.3s;
}

.page-about .about-data-stat:hover {
  background: rgba(255, 255, 255, 0.06);
}

.page-about .about-data-panel .stat-value {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--about-gold);
  line-height: 1.2;
}

.page-about .about-data-panel .stat-label {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.8);
}

.page-about .about-dims {
  background: #ffffff;
  border: 1px solid rgba(42, 42, 38, 0.08);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.page-about .about-dims h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--about-green);
  display: inline-block;
}

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

.page-about .about-dims .term-list dt {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--about-ink);
  margin-top: 0.875rem;
}

.page-about .about-dims .term-list dt:first-child {
  margin-top: 0;
}

.page-about .about-dims .term-list dd {
  margin: 0.25rem 0 0;
  font-size: 0.875rem;
  color: var(--about-slate);
  line-height: 1.6;
}

.page-about .about-data-note {
  margin-top: 1.5rem;
  font-size: 0.875rem;
  color: var(--about-slate);
  background: rgba(201, 162, 39, 0.08);
  border-left: 3px solid var(--about-gold);
  padding: 0.75rem 1rem;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .about-data-visual .image-field {
  aspect-ratio: 16 / 10;
  border: 1px solid rgba(42, 42, 38, 0.1);
  box-shadow: var(--shadow);
}

.page-about .about-data-visual .image-field img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-update-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.page-about .about-update-step {
  background: var(--about-blue);
  border-radius: var(--radius);
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}

.page-about .about-update-step::after {
  content: "";
  position: absolute;
  right: -2rem;
  top: -2rem;
  width: 6rem;
  height: 6rem;
  border: 2px solid rgba(255, 255, 255, 0.08);
  border-radius: 50%;
}

.page-about .about-update-step-index {
  font-family: var(--font-index);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--about-gold);
}

.page-about .about-update-step h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: #ffffff;
  margin: 0.5rem 0 0.5rem;
}

.page-about .about-update-step p {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.78);
  line-height: 1.7;
  margin: 0;
}

.page-about .about-users-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.page-about .about-users-card {
  position: relative;
  text-align: center;
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 10rem;
  overflow: hidden;
}

.page-about .about-users-num {
  display: block;
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--about-ink);
  line-height: 1.2;
  transition: color 0.3s;
}

.page-about .about-users-card:hover .about-users-num {
  color: var(--about-green);
}

.page-about .about-users-label {
  font-size: 0.875rem;
  color: var(--about-slate);
}

.page-about .about-users-hover {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  margin: 0;
  font-size: 0.8125rem;
  color: var(--about-gold);
  transition: max-height 0.3s ease, opacity 0.3s ease, margin 0.3s ease;
}

.page-about .about-users-card:hover .about-users-hover,
.page-about .about-users-card:focus-within .about-users-hover {
  max-height: 3rem;
  opacity: 1;
  margin-top: 0.5rem;
}

.page-about .about-partners-grid {
  display: grid;
  gap: 1.25rem;
}

.page-about .about-partners-card {
  padding: 1.5rem;
}

.page-about .about-partners-card h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0 0 0.625rem;
  color: var(--about-blue);
}

.page-about .about-partners-card p {
  font-size: 0.9375rem;
  color: var(--about-slate);
  line-height: 1.7;
  margin: 0;
}

.page-about .about-partners-image {
  margin-top: 2rem;
  aspect-ratio: 2 / 1;
  border: 1px solid rgba(42, 42, 38, 0.1);
  box-shadow: var(--shadow);
}

.page-about .about-partners-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-navi {
  display: grid;
  gap: 1rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 3.5rem;
}

.page-about .about-navi-link {
  display: flex;
  flex-direction: column;
  padding: 1.25rem 1.5rem;
  background: #ffffff;
  border: 1px solid rgba(42, 42, 38, 0.1);
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color 0.3s, transform 0.2s;
}

.page-about .about-navi-link:hover {
  border-color: var(--about-green);
  transform: translateY(-2px);
}

.page-about .about-navi-link span {
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--about-ink);
}

.page-about .about-navi-link small {
  font-size: 0.8125rem;
  color: var(--about-slate);
  margin-top: 0.25rem;
}

@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 5rem 2.5rem 4rem;
  }

  .page-about .about-hero-coord {
    display: inline-block;
  }

  .page-about .chapter {
    padding: 5rem 2.5rem;
  }

  .page-about .chapter-head {
    flex-direction: row;
    align-items: baseline;
    gap: 1rem;
    margin-bottom: 3rem;
  }

  .page-about .chapter-index {
    font-size: 3rem;
    margin-bottom: 0;
  }

  .page-about .chapter-title {
    font-size: 2.25rem;
    margin-bottom: 0;
  }

  .page-about .chapter-sub {
    margin-left: auto;
    text-align: right;
    max-width: 36rem;
  }

  .page-about .about-history-layout {
    grid-template-columns: 0.7fr 1.3fr;
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-data-layout {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-update-steps {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
  }

  .page-about .about-users-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
  }

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

  .page-about .about-navi {
    grid-template-columns: repeat(3, 1fr);
    padding: 3.5rem 2.5rem 5rem;
  }
}