.page-about {
  --about-gold-line: rgba(245, 183, 0, 0.35);
  --about-red-panel: rgba(139, 0, 0, 0.3);
  --about-blue-panel: rgba(28, 63, 96, 0.55);
  --about-grid-line: rgba(42, 58, 94, 0.55);
  position: relative;
  padding: 2rem 1.25rem 4rem;
  overflow-x: hidden;
}

.page-about .breadcrumb {
  margin-bottom: 1.5rem;
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--text-dim);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin-right: 0.35rem;
  color: var(--text-dim);
}

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

.page-about .about-hero {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 2.25rem;
  padding: 2rem 1.5rem 2.25rem;
  background:
    var(--scanline),
    linear-gradient(130deg, var(--about-blue-panel) 0%, rgba(11, 16, 32, 0.94) 65%),
    var(--bg-panel);
  border: 1px solid var(--border);
  border-top: 4px solid var(--accent);
  clip-path: polygon(0 0, calc(100% - 1.5rem) 0, 100% 1.5rem, 100% 100%, 1.5rem 100%, 0 calc(100% - 1.5rem));
}

.page-about .about-hero-kicker {
  margin: 0 0 0.5rem;
  font-family: var(--font-data);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--accent);
  text-transform: uppercase;
}

.page-about .about-hero-title {
  margin: 0 0 1rem;
  font-family: var(--font-head);
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  line-height: 1.25;
  color: var(--text-main);
  max-width: 22em;
}

.page-about .about-hero-lede {
  margin: 0 0 1.25rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-dim);
  max-width: 42rem;
}

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

.page-about .about-hero-fact {
  display: flex;
  align-items: stretch;
  gap: 0.75rem;
  max-width: 14rem;
  padding: 0.9rem 1rem;
  background:
    linear-gradient(90deg, var(--about-red-panel), rgba(139, 0, 0, 0.12)),
    var(--bg-panel);
  border-left: 3px solid var(--accent-2);
}

.page-about .about-hero-fact-rotate {
  writing-mode: vertical-rl;
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.25em;
  color: var(--accent-2);
  white-space: nowrap;
}

.page-about .about-hero-fact-season {
  font-family: var(--font-data);
  font-size: 1.2rem;
  letter-spacing: 0.06em;
  color: var(--text-main);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.5rem;
}

.page-about .about-sidebar,
.page-about .about-body {
  min-width: 0;
}

.page-about .about-body {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.page-about .about-toc {
  padding: 1rem 1rem 1.1rem;
  border: 1px solid var(--border);
  background:
    var(--scanline),
    var(--bg-panel);
  clip-path: polygon(0 0, calc(100% - 0.75rem) 0, 100% 0.75rem, 100% 100%, 0 100%);
}

.page-about .about-toc-label {
  margin: 0 0 0.75rem;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--text-dim);
  text-transform: uppercase;
}

.page-about .about-toc-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-toc-list a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--border);
  background: rgba(13, 21, 39, 0.72);
  color: var(--text-main);
  text-decoration: none;
  font-size: 0.85rem;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-toc-list a:hover {
  border-color: var(--accent);
  background: rgba(28, 63, 96, 0.4);
  color: var(--accent);
}

.page-about .about-toc-list i {
  font-family: var(--font-data);
  font-style: normal;
  color: var(--accent-2);
  font-size: 0.72rem;
}

.page-about .about-toc-foot {
  margin: 0.85rem 0 0;
  padding-top: 0.6rem;
  border-top: 1px dashed var(--about-gold-line);
  font-family: var(--font-data);
  font-size: 0.7rem;
  color: var(--text-dim);
}

.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  padding-top: 1.5rem;
  margin-top: 2.5rem;
  border-top: 1px solid var(--border);
  scroll-margin-top: 1.5rem;
}

.page-about .about-chapter-num {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.page-about .about-chapter-num-main {
  font-family: var(--font-head);
  font-size: 2.75rem;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent-2);
}

.page-about .about-chapter-num-side {
  writing-mode: vertical-rl;
  height: 2.75rem;
  font-family: var(--font-body);
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  color: var(--text-dim);
  white-space: nowrap;
}

.page-about .about-chapter-body {
  min-width: 0;
}

.page-about .about-chapter-body .section-head {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.page-about .about-chapter-body .section-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  line-height: 1.3;
  color: var(--text-main);
}

.page-about .about-chapter-body .section-annotation {
  writing-mode: vertical-rl;
  height: 2.4rem;
  font-family: var(--font-data);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--accent);
  white-space: nowrap;
}

.page-about .about-lead-text {
  margin: 0 0 1rem;
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--text-main);
}

.page-about .about-figure {
  display: block;
  width: 100%;
  height: auto;
  margin: 1.25rem 0;
  border: 1px solid var(--border);
  object-fit: cover;
}

.page-about .about-principles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
}

.page-about .about-principles li {
  padding: 0.9rem 1rem;
  border-left: 3px solid var(--accent);
  background: rgba(28, 63, 96, 0.3);
}

.page-about .about-principles strong {
  display: block;
  margin-bottom: 0.25rem;
  font-family: var(--font-head);
  font-size: 1rem;
  color: var(--accent-2);
}

.page-about .about-principles span {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-milestone-img {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 0 1.25rem;
  border: 1px solid var(--border);
  object-fit: cover;
}

.page-about .about-milestone-track {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
}

.page-about .about-milestone-item {
  position: relative;
  padding: 1.1rem 1rem 1rem 1.25rem;
  border: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(28, 63, 96, 0.6), rgba(11, 16, 32, 0.78));
  clip-path: polygon(0 0, calc(100% - 0.875rem) 0, 100% 0.875rem, 100% 100%, 0 100%);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-milestone-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: var(--accent);
}

.page-about .about-milestone-marker {
  display: inline-block;
  margin-bottom: 0.5rem;
  padding: 0.125rem 0.5rem;
  border: 1px solid var(--accent-2);
  font-family: var(--font-data);
  font-size: 0.75rem;
  color: var(--accent-2);
}

.page-about .about-milestone-item h3 {
  margin: 0 0 0.3rem;
  font-family: var(--font-head);
  font-size: 1.25rem;
  color: var(--text-main);
}

.page-about .about-milestone-item > p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-dim);
}

.page-about .about-milestone-detail {
  margin-top: 0.75rem !important;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border);
  color: var(--text-main) !important;
}

.page-about .about-milestone-item:hover,
.page-about .about-milestone-item:focus-within {
  border-color: var(--accent);
  background: linear-gradient(135deg, rgba(0, 229, 160, 0.08), rgba(28, 63, 96, 0.62));
  transform: translateY(-0.25rem);
}

.page-about .about-data-intro {
  margin: 0 0 1.25rem;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-data-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0 0 1.5rem;
  padding: 0.5rem;
  border: 1px solid var(--border);
  background:
    linear-gradient(var(--about-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid-line) 1px, transparent 1px),
    var(--bg-deep);
  background-size: 24px 24px;
}

.page-about .about-data-cell {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 6.5rem;
  padding: 1rem 0.85rem;
  border: 1px solid var(--border);
  background: rgba(11, 16, 32, 0.86);
}

.page-about .about-data-num {
  margin: 0;
  font-family: var(--font-data);
  font-size: clamp(1.8rem, 5vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
}

.page-about .about-data-cell dd {
  margin: 0.5rem 0 0;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.page-about .about-data-panel {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent-2);
  background:
    linear-gradient(135deg, var(--about-blue-panel), rgba(11, 16, 32, 0.9)),
    var(--bg-panel);
  clip-path: polygon(0 0, calc(100% - 1rem) 0, 100% 1rem, 100% 100%, 0 100%);
}

.page-about .about-data-panel h3 {
  margin: 0 0 1rem;
  font-family: var(--font-head);
  font-size: 1.35rem;
  color: var(--accent-2);
}

.page-about .about-data-list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.75rem;
}

.page-about .about-data-item {
  padding: 0.9rem;
  border: 1px solid var(--border);
  background: rgba(11, 16, 32, 0.7);
}

.page-about .about-data-item span {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--font-data);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--accent);
}

.page-about .about-data-item p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-dim);
}

.page-about .about-local-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
}

.page-about .about-local-content p {
  margin: 0 0 1rem;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-about .about-local-list {
  display: grid;
  gap: 0.6rem;
  list-style: none;
  margin: 1.25rem 0;
  padding: 0;
}

.page-about .about-local-list li {
  position: relative;
  padding-left: 1.3rem;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-dim);
}

.page-about .about-local-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.35rem;
  width: 0.6rem;
  height: 0.35rem;
  background: var(--accent);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
}

.page-about .about-local-map {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05);
}

.page-about .about-signature {
  margin-top: 3rem;
  padding: 2rem 1.5rem;
  border: 1px solid rgba(139, 0, 0, 0.55);
  background:
    var(--scanline),
    linear-gradient(120deg, var(--about-red-panel) 0%, rgba(139, 0, 0, 0.48) 60%, rgba(11, 16, 32, 0.95));
  clip-path: polygon(0 0, calc(100% - 1.5rem) 0, 100% 1.5rem, 100% 100%, 1.5rem 100%, 0 calc(100% - 1.5rem));
}

.page-about .about-signature-inner {
  max-width: 46rem;
}

.page-about .about-signature-kicker {
  margin: 0 0 0.75rem;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent-2);
}

.page-about .about-signature h2 {
  margin: 0 0 1rem;
  font-family: var(--font-head);
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  line-height: 1.3;
  color: var(--text-main);
}

.page-about .about-signature p {
  margin: 0 0 1.25rem;
  line-height: 1.85;
  color: rgba(242, 242, 242, 0.82);
}

.page-about .about-signature-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.page-about .about-signature-links a:last-child {
  padding-bottom: 0.15rem;
  border-bottom: 1px solid var(--accent);
  color: var(--accent);
  font-family: var(--font-data);
  font-size: 0.85rem;
  text-decoration: none;
}

.page-about .about-signature-links a:last-child:hover {
  border-color: var(--gold);
  color: var(--gold);
}

@media (min-width: 600px) {
  .page-about {
    padding: 2.5rem 2rem 4rem;
  }

  .page-about .about-data-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-signature {
    padding: 2.5rem 2rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: 13rem minmax(0, 1fr);
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .about-sidebar {
    position: sticky;
    top: 1.25rem;
  }

  .page-about .about-toc-list {
    flex-direction: column;
    gap: 0.25rem;
  }

  .page-about .about-toc-list a {
    border: 0;
    border-left: 2px solid var(--border);
    background: transparent;
    padding: 0.5rem 0 0.5rem 0.75rem;
    border-radius: 0;
  }

  .page-about .about-toc-list a:hover {
    background: transparent;
    border-left-color: var(--accent);
  }

  .page-about .about-chapter {
    grid-template-columns: 7rem minmax(0, 1fr);
    gap: 1.5rem;
  }

  .page-about .about-chapter-num {
    border-bottom: 0;
    padding-bottom: 0;
  }

  .page-about .about-principles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-data-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-local-wrap {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
  }

  .page-about .about-signature {
    padding: 3rem 3rem 2.5rem;
  }
}

@media (min-width: 980px) {
  .page-about .about-milestone-track {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0.875rem;
  }

  .page-about .about-milestone-item:not(:last-child)::after {
    content: "";
    position: absolute;
    right: -0.9rem;
    top: 50%;
    width: 0.75rem;
    height: 2px;
    background: var(--accent);
    opacity: 0.4;
  }

  .page-about .about-milestone-detail {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transform: translateY(0.375rem);
    margin-top: 0 !important;
    padding-top: 0;
    border-top: 0;
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), max-height 0.35s var(--ease), padding-top 0.35s var(--ease);
  }

  .page-about .about-milestone-item:hover .about-milestone-detail,
  .page-about .about-milestone-item:focus-within .about-milestone-detail {
    max-height: 12rem;
    overflow: visible;
    opacity: 1;
    transform: translateY(0);
    margin-top: 0.75rem !important;
    padding-top: 0.75rem;
    border-top: 1px dashed var(--border);
  }
}