.page-about {
  --about-rail-width: 264px;
  --about-border-card: 3px solid var(--color-text);
  --about-shadow-hard: 8px 8px 0 rgba(4, 12, 26, 0.88);
  background:
    radial-gradient(ellipse at 85% 10%, rgba(0, 212, 255, 0.10), transparent 50%),
    radial-gradient(ellipse at 10% 80%, rgba(122, 92, 255, 0.08), transparent 45%),
    var(--color-bg-deep);
  overflow-x: hidden;
}
.page-about .about-crumb {
  max-width: 1440px;
  margin: 0 auto;
  padding: 20px 16px 10px;
}
.page-about .about-crumb .breadcrumb-link {
  color: var(--color-silver);
}
.page-about .about-crumb .breadcrumb-current {
  color: var(--color-text-light);
}
.page-about .about-layout {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 16px 72px;
}
.page-about .about-rail {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding: 18px 16px;
  margin-bottom: 20px;
  background: linear-gradient(135deg, rgba(11, 26, 51, 0.96), rgba(30, 76, 143, 0.88));
  border: 1px solid rgba(192, 201, 213, 0.22);
}
.page-about .rail-brand {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 10px;
}
.page-about .about-rail .brand-badge {
  font-family: var(--font-data);
  font-size: 20px;
  font-weight: 700;
  line-height: 1;
  width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.page-about .rail-brand-name {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 20px;
  color: var(--color-text-light);
  letter-spacing: 0.06em;
}
.page-about .rail-note {
  grid-column: 1 / -1;
  margin: -4px 0 0 48px;
  font-size: 13px;
  color: var(--color-silver);
}
.page-about .rail-stats {
  grid-column: 1 / -1;
  display: flex;
  gap: 8px;
}
.page-about .rail-stat {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 4px;
  border: 1px solid rgba(0, 212, 255, 0.3);
  background: rgba(6, 13, 26, 0.5);
}
.page-about .rail-stat-num {
  font-family: var(--font-data);
  font-size: 21px;
  font-weight: 700;
  color: var(--color-electric);
}
.page-about .rail-stat-label {
  margin-top: 4px;
  font-size: 12px;
  color: var(--color-silver);
}
.page-about .rail-nav {
  grid-column: 1 / -1;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 4px 2px;
  scrollbar-width: none;
}
.page-about .rail-nav::-webkit-scrollbar {
  display: none;
}
.page-about .rail-nav-link {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 10px;
  font-size: 13px;
  color: var(--color-text-light);
  text-decoration: none;
  border: 1px solid rgba(192, 201, 213, 0.3);
  background: rgba(6, 13, 26, 0.4);
  transition: border-color var(--ease-fast), background var(--ease-fast), color var(--ease-fast);
}
.page-about .rail-nav-index {
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--color-purple);
}
.page-about .rail-nav-link.is-spy-active {
  border-color: var(--color-orange);
  background: rgba(255, 122, 0, 0.12);
}
.page-about .rail-nav-link.is-spy-active .rail-nav-index {
  color: var(--color-electric);
}
.page-about .rail-art {
  display: none;
}
.page-about .about-articles {
  position: relative;
  min-width: 0;
}
.page-about .about-articles::before {
  content: "";
  display: block;
  height: 4px;
  background: linear-gradient(90deg, var(--color-orange) 0%, var(--color-electric) 55%, var(--color-purple) 100%);
  margin-bottom: 26px;
}
.page-about .about-hero {
  position: relative;
  padding: 28px 24px 32px;
  background: var(--color-light-bg);
  border: var(--about-border-card);
  box-shadow: 10px 10px 0 rgba(4, 12, 26, 0.85);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: linear-gradient(180deg, var(--color-orange), var(--color-electric), var(--color-purple));
}
.page-about .about-hero h1 {
  margin: 14px 0 12px;
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 30px;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--color-text);
}
.page-about .about-lead {
  max-width: 780px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-text);
  margin: 0;
}
.page-about .hero-data {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--color-silver);
}
.page-about .hero-data-item {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-data);
  font-size: 13px;
  color: var(--color-blue);
  background: #fff;
  border: 1px solid var(--color-silver);
  padding: 6px 12px;
}
.page-about .hero-data-item b {
  font-size: 18px;
  color: var(--color-bg-deep);
}
.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 22px;
}
.page-about .hero-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-blue);
  text-decoration: none;
  border-bottom: 2px solid var(--color-electric);
}
.page-about .hero-link span {
  display: inline-block;
  transition: transform var(--ease-fast);
}
.page-about .hero-link:hover span {
  transform: translateX(3px);
}
.page-about .about-chapter {
  margin-top: 40px;
  padding: 28px 24px 30px;
  background: #fff;
  border: var(--about-border-card);
  box-shadow: var(--about-shadow-hard);
}
.page-about .chapter-head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding-bottom: 16px;
  margin-bottom: 24px;
  border-bottom: 2px solid var(--color-silver);
}
.page-about .chapter-num {
  font-family: var(--font-data);
  font-size: 52px;
  font-weight: 700;
  line-height: 0.9;
  color: var(--color-purple);
}
.page-about .about-chapter h2 {
  margin: 4px 0 4px;
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 24px;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--color-text);
}
.page-about .chapter-sub {
  margin: 0;
  font-size: 14px;
  color: var(--color-blue);
  font-weight: 500;
}
.page-about .chapter-body p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-text);
}
.page-about .chapter-body p:last-child {
  margin-bottom: 0;
}
.page-about .brand-rail-glance {
  display: grid;
  grid-template-columns: auto 1fr auto 1fr;
  align-items: center;
  gap: 10px 14px;
  margin-top: 26px;
  padding: 18px 16px;
  background: var(--color-bg-deep);
}
.page-about .glance-num {
  font-family: var(--font-data);
  font-weight: 700;
  font-size: 36px;
  color: var(--color-orange);
}
.page-about .glance-text {
  font-size: 13px;
  line-height: 1.5;
  color: var(--color-text-light);
}
.page-about .timeline {
  position: relative;
  margin: 8px 0 0;
  padding-left: 26px;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: repeating-linear-gradient(180deg, var(--color-blue) 0 8px, transparent 8px 14px);
}
.page-about .timeline-node {
  position: relative;
  padding: 0 0 28px 12px;
}
.page-about .timeline-node::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 6px;
  width: 13px;
  height: 13px;
  background: var(--color-bg-deep);
  border: 3px solid var(--color-orange);
  transition: background var(--ease-fast);
}
.page-about .timeline-node:hover::before {
  background: var(--color-orange);
}
.page-about .timeline-year {
  display: block;
  font-family: var(--font-data);
  font-size: 34px;
  font-weight: 700;
  line-height: 1.05;
  color: var(--color-purple);
  margin-bottom: 10px;
}
.page-about .timeline-card {
  padding: 16px 18px;
  background: var(--color-light-bg);
  border: 2px solid var(--color-text);
  transition: border-color var(--ease-fast), box-shadow var(--ease-fast), transform var(--ease-fast);
}
.page-about .timeline-node:hover .timeline-card {
  border-color: var(--color-electric);
  box-shadow: 5px 5px 0 rgba(0, 212, 255, 0.22);
  transform: translateX(3px);
}
.page-about .timeline-card h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  color: var(--color-text);
}
.page-about .timeline-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
}
.page-about .timeline-summary {
  display: inline-block;
  margin-top: 10px;
  padding: 3px 8px;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-blue);
  background: rgba(122, 92, 255, 0.08);
  border: 1px solid rgba(122, 92, 255, 0.3);
}
.page-about .about-figure {
  margin: 28px 0 0;
  padding: 10px;
  background: var(--color-bg-deep);
  border: 2px solid var(--color-blue);
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
}
.page-about figcaption {
  padding: 12px 6px 6px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--color-electric);
}
.page-about .data-panel {
  display: grid;
  gap: 26px;
}
.page-about .data-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--color-text);
}
.page-about .data-copy p:last-of-type {
  margin-bottom: 18px;
}
.page-about .field-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .field-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: var(--color-light-bg);
  border-left: 3px solid var(--color-teal);
  font-size: 14px;
  line-height: 1.5;
  color: var(--color-text);
}
.page-about .field-tag {
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  color: var(--color-blue);
  background: rgba(0, 229, 204, 0.16);
  padding: 3px 8px;
}
.page-about .data-figure {
  margin: 0;
  border: 2px solid var(--color-text);
  background: var(--color-light-bg);
  padding: 14px;
}
.page-about .dot-matrix {
  height: 118px;
  background-image: radial-gradient(circle, rgba(0, 212, 255, 0.8) 1.5px, transparent 1.6px);
  background-size: 22px 22px;
  animation: about-dot-pulse 3.2s ease-in-out infinite;
  border-bottom: 2px solid var(--color-silver);
}
.page-about .dot-note {
  display: block;
  padding: 10px 2px 6px;
  font-family: var(--font-data);
  font-size: 12px;
  color: var(--color-blue);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.page-about .data-figure img {
  display: block;
  width: 100%;
  height: auto;
}
.page-about .data-figure figcaption {
  padding: 10px 2px 2px;
  font-family: var(--font-data);
  font-size: 12px;
  color: #5b6577;
}
.page-about .source-note {
  display: flex;
  gap: 12px;
  margin-top: 26px;
  padding: 14px 16px;
  border: 2px dashed var(--color-silver);
  background: rgba(238, 242, 247, 0.7);
}
.page-about .source-note .source-icon {
  font-family: var(--font-data);
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border: 2px solid var(--color-purple);
  color: var(--color-purple);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}
.page-about .source-note p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text);
}
.page-about .source-note a {
  color: var(--color-blue);
  font-weight: 600;
}
.page-about .team-grid {
  display: grid;
  gap: 18px;
  margin-top: 4px;
}
.page-about .team-card {
  padding: 22px 20px;
  background: var(--color-light-bg);
  border: 2px solid var(--color-text);
}
.page-about .team-card-label {
  font-family: var(--font-data);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-blue);
}
.page-about .team-card-count {
  display: block;
  font-family: var(--font-data);
  font-size: 42px;
  font-weight: 700;
  color: var(--color-bg-deep);
  margin: 8px 0 6px;
}
.page-about .team-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text);
}
.page-about .team-distribution {
  margin-top: 28px;
  padding: 20px;
  border: 2px solid var(--color-blue);
  background: rgba(30, 76, 143, 0.07);
}
.page-about .team-distribution h3 {
  margin: 0 0 14px;
  font-size: 18px;
  font-weight: 800;
  color: var(--color-text);
}
.page-about .distribution-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .distribution-list div {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 14px;
  background: var(--color-light-bg);
  border-bottom: 2px solid var(--color-silver);
}
.page-about .distribution-list dt {
  font-family: var(--font-data);
  font-weight: 700;
  color: var(--color-blue);
  font-size: 15px;
}
.page-about .distribution-list dd {
  margin: 0;
  font-size: 14px;
  color: var(--color-text);
}
.page-about .contact-arrow {
  margin-top: 24px;
  padding: 16px 18px;
  background: var(--color-bg-deep);
  color: var(--color-text-light);
  font-size: 14px;
  line-height: 1.8;
  border-left: 5px solid var(--color-orange);
}
.page-about .contact-arrow a {
  color: var(--color-electric);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 212, 255, 0.5);
}
.page-about .contact-caveat {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--color-silver);
}
.page-about .eco-grid {
  display: grid;
  gap: 18px;
}
.page-about .eco-item {
  position: relative;
  padding: 20px 20px 20px 74px;
  background: var(--color-light-bg);
  border: 2px solid var(--color-text);
}
.page-about .eco-index {
  position: absolute;
  left: 18px;
  top: 18px;
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-data);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text-light);
  background: var(--color-purple);
}
.page-about .eco-item h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  color: var(--color-text);
}
.page-about .eco-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text);
}
.page-about .eco-note {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--color-silver);
  font-size: 13px;
  color: var(--color-blue);
}
.page-about .trust-bar {
  margin-top: 28px;
  padding: 18px 20px;
  background: var(--color-bg-deep);
  border-left: 5px solid var(--color-teal);
  color: var(--color-text-light);
  font-size: 14px;
  line-height: 1.8;
}
.page-about .trust-bar p {
  margin: 0;
}
.page-about .ecosystem-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}
@keyframes about-dot-pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
  .page-about .dot-matrix { animation: none; }
  .page-about .timeline-card { transition: none; }
  .page-about .rail-nav-link { transition: none; }
}
@media (min-width: 768px) {
  .page-about .about-crumb { padding: 24px 24px 12px; }
  .page-about .about-layout { padding: 0 24px 80px; }
  .page-about .about-rail { padding: 22px 20px; gap: 14px; }
  .page-about .about-hero { padding: 36px 40px 38px; }
  .page-about .about-hero h1 { font-size: 40px; }
  .page-about .about-chapter { padding: 36px 40px 40px; margin-top: 48px; }
  .page-about .about-chapter h2 { font-size: 28px; }
  .page-about .chapter-num { font-size: 64px; }
  .page-about .timeline { padding-left: 34px; }
  .page-about .timeline-card { padding: 20px 24px; }
  .page-about .team-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
  .page-about .eco-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
  .page-about .data-panel { gap: 20px; }
  .page-about .distribution-list { grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
  .page-about .distribution-list div { flex-direction: column; align-items: flex-start; gap: 4px; }
}
@media (min-width: 1024px) {
  .page-about .about-layout {
    display: flex;
    align-items: flex-start;
    gap: 32px;
  }
  .page-about .about-rail {
    display: block;
    width: var(--about-rail-width);
    flex-shrink: 0;
    position: sticky;
    top: 168px;
    max-height: calc(100vh - 200px);
    overflow-y: auto;
    padding: 28px 26px 26px;
    margin-bottom: 0;
  }
  .page-about .rail-brand { margin-bottom: 4px; }
  .page-about .rail-note { margin: 0 0 24px 0; }
  .page-about .rail-stats { flex-direction: column; gap: 9px; }
  .page-about .rail-stat {
    flex-direction: row;
    justify-content: space-between;
    align-items: baseline;
    padding: 12px 14px;
    text-align: left;
  }
  .page-about .rail-stat-num { font-size: 23px; }
  .page-about .rail-nav {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding: 0;
    margin-top: 26px;
  }
  .page-about .rail-nav-link {
    border: 0;
    border-left: 2px solid rgba(192, 201, 213, 0.3);
    background: transparent;
    padding: 8px 0 8px 14px;
    border-radius: 0;
  }
  .page-about .rail-nav-link.is-spy-active {
    border-left-color: var(--color-orange);
    background: linear-gradient(90deg, rgba(255, 122, 0, 0.14), transparent);
  }
  .page-about .rail-nav-link.is-spy-active .rail-nav-index { color: var(--color-orange); }
  .page-about .rail-art {
    display: block;
    margin-top: 28px;
    border: 1px solid rgba(192, 201, 213, 0.25);
    overflow: hidden;
    line-height: 0;
  }
  .page-about .rail-art img {
    width: 100%;
    height: auto;
    opacity: 0.55;
    transition: opacity var(--ease-base);
  }
  .page-about .rail-art:hover img { opacity: 0.9; }
  .page-about .about-articles { flex: 1; }
  .page-about .data-panel {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
  }
  .page-about .data-figure { margin: 0; }
}