.page-about {
  --ab-rail: 31px;
  --ab-card-shadow: 3px 3px 0 #000;
  background: var(--color-ink);
  background-image:
    linear-gradient(var(--color-grid-fade) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid-fade) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--color-text);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .breadcrumb {
  margin-top: 20px;
}

.page-about .breadcrumb a {
  color: var(--color-text-dim);
}

.page-about .ab-hero {
  padding-top: 24px;
}

.page-about .ab-hero-inner {
  display: grid;
  gap: 32px;
}

.page-about .ab-hero-copy {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero-title {
  font-family: var(--font-head);
  font-size: var(--fs-hero);
  font-weight: 900;
  line-height: 0.92;
  letter-spacing: -0.02em;
  margin: 8px 0 16px;
  text-transform: uppercase;
}

.page-about .ab-hero-title-sub {
  display: block;
  margin-top: 14px;
  font-size: 0.3em;
  font-weight: 900;
  letter-spacing: 0.06em;
  color: var(--color-text-dim);
  text-transform: none;
}

.page-about .ab-hero-lead {
  margin: 0;
  max-width: 60ch;
  color: var(--color-text-dim);
  line-height: 1.75;
}

.page-about .ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.page-about .ab-hero-panel {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 28px 24px;
  border: 1px solid var(--color-grid);
  background:
    linear-gradient(135deg, rgba(18, 28, 40, 0.96), rgba(8, 16, 26, 0.98)),
    repeating-linear-gradient(90deg, var(--color-grid-fade) 0 1px, transparent 1px 40px);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-hero-panel::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 48px;
  height: 48px;
  background: var(--color-accent);
  clip-path: polygon(100% 0, 0 0, 100% 100%);
}

.page-about .ab-panel-label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--color-accent);
}

.page-about .ab-panel-since {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 0.85;
  color: var(--color-text-dim);
  text-transform: uppercase;
}

.page-about .ab-panel-since strong {
  display: block;
  font-size: clamp(3rem, 10vw, 4.8rem);
  color: var(--color-accent);
}

.page-about .ab-panel-list {
  display: grid;
  margin: 0;
  border-top: 1px solid var(--color-grid);
}

.page-about .ab-panel-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-grid);
}

.page-about .ab-panel-row dt {
  color: var(--color-text-dim);
  font-size: var(--fs-small);
}

.page-about .ab-panel-row dd {
  margin: 0;
  color: var(--color-text);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--fs-small);
  text-align: right;
}

.page-about .ab-panel-note {
  margin: 0;
  font-size: var(--fs-small);
  color: var(--color-text-dim);
}

.page-about .ab-index {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 48px;
  margin-bottom: 24px;
}

.page-about .ab-index-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px;
  border: 1px solid var(--color-grid);
  background: var(--color-ink-deep);
  color: var(--color-text);
  text-decoration: none;
  box-shadow: 2px 2px 0 #000;
  transition: border-color 0.2s, transform 0.2s;
}

.page-about .ab-index-item:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.page-about .ab-index-item span {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-accent-orange);
  font-weight: 700;
}

.page-about .section-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 24px;
}

.page-about .section-label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--color-accent);
  border: 1px solid var(--color-grid);
  padding: 6px 8px;
  min-width: 48px;
  text-align: center;
}

.page-about .ab-section-head {
  display: grid;
  gap: 4px;
}

.page-about .section-title {
  margin: 0;
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.1;
}

.page-about .ab-mission-grid {
  display: grid;
  gap: 32px;
  margin-top: 24px;
}

.page-about .ab-mission-copy p {
  margin: 0 0 16px;
  color: var(--color-text-dim);
  line-height: 1.8;
}

.page-about .ab-mission-aphorism {
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 900;
  color: var(--color-accent);
  margin-top: 20px;
}

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

.page-about .ab-mission-list li {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 14px;
  align-items: start;
  padding: 18px;
  border: 1px solid var(--color-grid);
  background: var(--color-ink-deep);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-mission-list li > span {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-accent-orange);
  line-height: 1.2;
}

.page-about .ab-mission-list strong {
  display: block;
  margin-bottom: 4px;
  font-size: 1.1rem;
}

.page-about .ab-mission-list p {
  margin: 0;
  color: var(--color-text-dim);
  line-height: 1.6;
}

.page-about .ab-timeline-sec {
  background: var(--color-ink-deep);
  border-top: 1px solid var(--color-grid);
  border-bottom: 1px solid var(--color-grid);
}

.page-about .ab-timeline-desc {
  margin: 0 0 32px;
  max-width: 58ch;
  color: var(--color-text-dim);
}

.page-about .ab-timeline {
  position: relative;
  display: grid;
  gap: 40px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: var(--ab-rail);
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent-orange), var(--color-grid) 60%, transparent);
  transform: translateX(-50%);
}

.page-about .ab-tl-row {
  position: relative;
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 16px;
}

.page-about .ab-tl-stamp {
  padding-top: 10px;
  text-align: right;
}

.page-about .ab-tl-year {
  display: block;
  font-family: var(--font-head);
  font-size: clamp(2rem, 8vw, 3.2rem);
  font-weight: 900;
  line-height: 0.95;
  color: var(--color-text);
}

.page-about .ab-tl-tag {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-accent-orange);
  letter-spacing: 0.08em;
}

.page-about .ab-tl-row::after {
  content: "";
  position: absolute;
  top: 20px;
  left: var(--ab-rail);
  width: 10px;
  height: 10px;
  background: var(--color-accent-orange);
  border: 2px solid var(--color-ink-deep);
  transform: translateX(-50%) rotate(45deg);
}

.page-about .ab-tl-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-grid);
  background: var(--color-ink);
  box-shadow: var(--shadow-hard);
  padding: 20px;
}

.page-about .ab-tl-card::after {
  content: attr(data-index);
  position: absolute;
  right: 8px;
  bottom: -8px;
  font-family: var(--font-head);
  font-size: 3.4rem;
  font-weight: 900;
  color: var(--color-grid-fade);
  pointer-events: none;
}

.page-about .ab-tl-figure {
  margin: -20px -20px 16px;
}

.page-about .ab-tl-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 300px;
  object-fit: cover;
}

.page-about .ab-tl-content {
  position: relative;
}

.page-about .ab-tl-title {
  margin: 10px 0 8px;
  font-size: 1.25rem;
  font-weight: 700;
}

.page-about .ab-tl-summary {
  margin: 0;
  color: var(--color-text-dim);
  line-height: 1.65;
}

.page-about .ab-tl-more {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--color-grid);
}

.page-about .ab-tl-more p {
  margin: 0;
  color: var(--color-text-dim);
  line-height: 1.7;
  font-size: var(--fs-small);
}

.page-about .ab-tl-toggle {
  appearance: none;
  background: none;
  border: none;
  margin-top: 12px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-accent);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.page-about .ab-tl-toggle::before {
  content: "−";
  display: inline-block;
  font-weight: 700;
  color: var(--color-accent);
  font-size: 1rem;
  line-height: 1;
}

.page-about .ab-tl-toggle[aria-expanded="false"]::before {
  content: "+";
}

.page-about .ab-data-grid {
  display: grid;
  gap: 32px;
  margin-top: 24px;
}

.page-about .ab-data-desc {
  margin: 0 0 24px;
  max-width: 60ch;
  color: var(--color-text-dim);
  line-height: 1.8;
}

.page-about .ab-stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about .ab-stat-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 20px 16px;
  border: 1px solid var(--color-grid);
  background: var(--color-ink-deep);
  box-shadow: 2px 2px 0 #000;
}

.page-about .ab-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: 800;
  line-height: 1;
  color: var(--color-accent);
}

.page-about .ab-stat-label {
  margin-top: 10px;
  color: var(--color-text-dim);
  font-size: var(--fs-small);
}

.page-about .ab-data-sorts {
  display: grid;
  gap: 10px;
  margin-top: 24px;
}

.page-about .ab-sort-line {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-grid);
}

.page-about .ab-sort-key {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-accent-orange);
  white-space: nowrap;
}

.page-about .ab-sort-val {
  color: var(--color-text);
  line-height: 1.5;
}

.page-about .ab-map-visual {
  position: relative;
  margin: 0;
  border: 1px solid var(--color-grid);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .ab-map-visual img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-map-pin {
  position: absolute;
  width: 12px;
  height: 12px;
  background: var(--color-accent);
  border: 2px solid var(--color-ink);
  cursor: default;
  transition: transform 0.2s ease;
}

.page-about .ab-map-pin-eu {
  top: 30%;
  left: 44%;
}

.page-about .ab-map-pin-cn {
  top: 62%;
  left: 74%;
  background: var(--color-accent-orange);
  border-color: var(--color-ink);
}

.page-about .ab-map-pin b {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translateX(-50%);
  padding: 4px 8px;
  background: var(--color-ink);
  border: 1px solid var(--color-grid);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 0.68rem;
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.2s ease;
  pointer-events: none;
}

.page-about .ab-map-visual:hover .ab-map-pin,
.page-about .ab-map-visual:focus-within .ab-map-pin {
  transform: scale(1.4);
}

.page-about .ab-map-visual:hover .ab-map-pin b,
.page-about .ab-map-visual:focus-within .ab-map-pin b {
  opacity: 1;
}

.page-about .ab-map-legend {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-map-legend li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 12px;
  border-left: 3px solid var(--color-accent);
  background: rgba(255, 255, 255, 0.03);
}

.page-about .ab-map-legend .ab-map-legend-cn {
  border-left-color: var(--color-accent-orange);
}

.page-about .ab-map-dot {
  width: 8px;
  height: 8px;
  margin-top: 5px;
  flex: 0 0 auto;
  background: var(--color-accent);
  transform: rotate(45deg);
}

.page-about .ab-map-legend-cn .ab-map-dot {
  background: var(--color-accent-orange);
}

.page-about .ab-map-legend strong {
  display: block;
  color: var(--color-text);
  font-size: 0.95rem;
}

.page-about .ab-map-legend em {
  display: block;
  font-style: normal;
  margin-top: 2px;
  color: var(--color-text-dim);
  font-size: var(--fs-small);
}

.page-about .ab-service-layout {
  display: grid;
  gap: 32px;
  margin-top: 24px;
  align-items: center;
}

.page-about .ab-service-lead {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.5;
  max-width: 28ch;
}

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

.page-about .ab-service-list li {
  display: grid;
  gap: 4px;
  padding: 16px 20px;
  border-left: 3px solid var(--color-accent-orange);
  background: var(--color-ink-deep);
}

.page-about .ab-service-list strong {
  font-size: 1.05rem;
}

.page-about .ab-service-list span {
  color: var(--color-text-dim);
  line-height: 1.6;
  font-size: var(--fs-small);
}

.page-about .ab-service-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-service-figure {
  margin: 0;
  border: 1px solid var(--color-grid);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-service-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-service-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--color-grid);
  background: var(--color-ink-deep);
  color: var(--color-text-dim);
  font-size: var(--fs-small);
}

.page-about .ab-trust {
  position: relative;
  margin: 40px 0 0;
  padding: 28px;
  border: 1px solid var(--color-grid);
  border-left: 4px solid var(--color-accent);
  background: var(--color-ink-deep);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-trust p {
  margin: 0;
  line-height: 1.8;
  color: var(--color-text);
}

.page-about .ab-trust cite {
  display: block;
  margin-top: 12px;
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-dim);
}

.page-about .ab-trust-tip {
  margin-top: 16px;
  color: var(--color-text-dim);
  font-size: var(--fs-small);
}

.page-about .ab-trust-tip a {
  color: var(--color-accent);
}

@media (min-width: 768px) {
  .page-about {
    --ab-rail: 43px;
  }

  .page-about .ab-hero-inner {
    grid-template-columns: 1.4fr 1fr;
    gap: 40px;
  }

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

  .page-about .ab-mission-grid {
    grid-template-columns: 1.1fr 1fr;
    gap: 40px;
  }

  .page-about .ab-tl-row {
    grid-template-columns: 96px 1fr;
  }

  .page-about .ab-data-grid {
    grid-template-columns: 1fr 1.15fr;
    gap: 40px;
  }

  .page-about .ab-stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .ab-service-layout {
    grid-template-columns: 1fr 0.9fr;
    gap: 40px;
  }
}

@media (min-width: 1024px) {
  .page-about {
    --ab-rail: 69px;
  }

  .page-about .ab-hero-inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(320px, 0.7fr);
  }

  .page-about .ab-hero-panel {
    padding: 40px 36px;
  }

  .page-about .ab-tl-row {
    grid-template-columns: 140px 1fr;
    gap: 24px;
  }

  .page-about .ab-tl-card {
    padding: 28px;
  }

  .page-about .ab-tl-figure {
    margin: -28px -28px 20px;
  }

  .page-about .ab-tl-figure img {
    max-height: 340px;
  }
}