.page-about {
  --about-accent: var(--electric-cyan);
  position: relative;
  background: var(--obsidian);
  color: var(--bone-white);
  overflow-x: clip;
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 4.25rem 0 3.5rem;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: 62%;
  height: 90%;
  background: linear-gradient(135deg, rgba(0, 229, 204, 0.2) 0%, rgba(215, 255, 63, 0.05) 100%);
  border: 1px solid rgba(0, 229, 204, 0.08);
  transform: skewX(-12deg);
  pointer-events: none;
}

.page-about .about-hero-shell {
  position: relative;
  z-index: 1;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--ash-gray);
}

.page-about .about-crumb a {
  color: var(--electric-cyan);
  text-decoration: none;
  transition: color 0.25s var(--ease-out);
}

.page-about .about-crumb a:hover {
  color: var(--neon-volt);
}

.page-about .crumb-sep {
  color: var(--mineral-slate);
}

.page-about .about-hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--neon-volt);
  transform: skewX(-6deg);
}

.page-about .about-hero-kicker svg {
  flex: 0 0 auto;
}

.page-about .about-hero h1 {
  margin: 0 0 1.25rem;
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  transform: skewX(-6deg);
}

.page-about .about-hero-lead {
  max-width: 34em;
  margin: 0;
  color: var(--ash-gray);
  font-size: 1.0625rem;
  line-height: 1.75;
}

.page-about .about-hero-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem;
  margin-top: 2rem;
}

.page-about .hero-metric {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  border-left: 2px solid var(--neon-volt);
  padding-left: 0.875rem;
}

.page-about .hero-metric-num {
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1;
  color: var(--bone-white);
}

.page-about .hero-metric-label {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  color: var(--ash-gray);
}

.page-about .about-hero-visual {
  position: relative;
  margin-top: 2.5rem;
}

.page-about .about-hero-visual img,
.page-about .capability-figure img,
.page-about .library-figure img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--border-thin);
}

.page-about .about-hero-visual img {
  transform: skewX(-1.5deg);
}

.page-about .about-visual-mark {
  position: absolute;
  top: -1.25rem;
  right: -0.25rem;
  width: 6rem;
  height: 6rem;
  opacity: 0.92;
  pointer-events: none;
}

.page-about .hero-visual-badge {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: rgba(10, 14, 23, 0.88);
  border: var(--border-thin);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--bone-white);
}

.page-about .badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--neon-volt);
  box-shadow: 0 0 10px rgba(215, 255, 63, 0.8);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 3.5rem;
  align-items: start;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

.page-about .about-main {
  order: 1;
  min-width: 0;
}

.page-about .about-side {
  order: 2;
  min-width: 0;
}

.page-about .about-side-head {
  margin-bottom: 1.5rem;
}

.page-about .about-side-head .section-tag {
  display: block;
  margin-bottom: 0.5rem;
}

.page-about .about-side-title {
  margin: 0;
  font-size: 1.375rem;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0 0 2rem;
  padding: 0;
  border-left: 1px solid rgba(46, 57, 71, 0.8);
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 1.875rem 1.5rem;
  margin: 0;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 3px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--electric-cyan);
  box-shadow: 0 0 12px rgba(0, 229, 204, 0.7);
}

.page-about .timeline-item:nth-child(2)::before {
  background: var(--neon-volt);
  box-shadow: 0 0 12px rgba(215, 255, 63, 0.7);
}

.page-about .timeline-item:nth-child(3)::before {
  background: var(--electric-cyan);
  box-shadow: 0 0 12px rgba(0, 229, 204, 0.7);
}

.page-about .timeline-item:nth-child(4)::before {
  background: var(--signal-orange);
  box-shadow: 0 0 12px rgba(255, 122, 26, 0.6);
}

.page-about .timeline-item.is-current::before {
  background: var(--neon-volt);
  box-shadow: 0 0 0 4px rgba(215, 255, 63, 0.3);
}

.page-about .timeline-item.is-current::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -8px;
  bottom: -8px;
  border: 1px solid rgba(215, 255, 63, 0.15);
  pointer-events: none;
}

.page-about .timeline-link {
  display: block;
  padding: 0.25rem 0.5rem 0.25rem 0;
  color: inherit;
  text-decoration: none;
  transition: background 0.25s var(--ease-out), padding-left 0.25s var(--ease-out);
}

.page-about .timeline-link:hover,
.page-about .timeline-link:focus-visible {
  background: rgba(255, 255, 255, 0.04);
  padding-left: 0.5rem;
  outline: none;
}

.page-about .timeline-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--ash-gray);
  transform: skewX(-6deg);
}

.page-about .timeline-tag {
  display: inline-block;
  margin-top: 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal-orange);
}

.page-about .timeline-heading {
  margin: 0.375rem 0 0;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .about-side-cta {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--glass-panel);
  border: var(--border-thin);
}

.page-about .about-side-cta .section-tag {
  display: block;
  margin-bottom: 0.625rem;
}

.page-about .about-side-cta-text {
  margin: 0 0 1.25rem;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--ash-gray);
}

.page-about .about-side-cta .btn {
  width: 100%;
  text-align: center;
}

.page-about .about-section {
  position: relative;
  border-top: 1px solid var(--mineral-slate);
  padding-top: 2.5rem;
  margin-top: 3rem;
  scroll-margin-top: calc(var(--header-h) + 1rem);
}

.page-about .about-section:target {
  outline: 1px solid rgba(0, 229, 204, 0.4);
  outline-offset: 12px;
}

.page-about .about-section-head {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.page-about .about-index {
  font-family: var(--font-mono);
  font-size: 1.625rem;
  font-weight: 700;
  line-height: 1;
  color: var(--electric-cyan);
  transform: skewX(-6deg);
}

.page-about .about-section h2 {
  margin: 0.75rem 0 1.25rem;
  font-size: clamp(1.5rem, 3.4vw, 2.25rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  transform: skewX(-6deg);
}

.page-about .about-focus-grid {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-focus-lead {
  max-width: 32em;
  margin: 0;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--bone-white);
}

.page-about .about-focus-list {
  display: grid;
  gap: 0.625rem;
  margin: 0;
  padding: 0 0 0 1.25rem;
  list-style: none;
  border-left: 2px solid var(--neon-volt);
}

.page-about .about-focus-list li {
  position: relative;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--ash-gray);
}

.page-about .about-focus-list li::before {
  content: "//";
  margin-right: 0.375rem;
  font-family: var(--font-mono);
  color: var(--electric-cyan);
}

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

.page-about .capability-card {
  position: relative;
  overflow: hidden;
  padding: 1.5rem 1.25rem;
  background: var(--glass-panel);
  border: var(--border-thin);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out), border-color 0.3s var(--ease-out);
}

.page-about .capability-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(135deg, rgba(215, 255, 63, 0.03) 0 2px, transparent 2px 10px);
  opacity: 0;
  transition: opacity 0.3s var(--ease-out);
  pointer-events: none;
}

.page-about .capability-card:hover,
.page-about .capability-card:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
  border-color: rgba(215, 255, 63, 0.4);
}

.page-about .capability-card:hover::after {
  opacity: 1;
}

.page-about .capability-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1;
  color: var(--neon-volt);
  transform: skewX(-6deg);
}

.page-about .capability-unit {
  display: inline-block;
  margin-top: 0.375rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ash-gray);
}

.page-about .capability-card p {
  margin: 0.875rem 0 0;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--ash-gray);
}

.page-about .capability-figure,
.page-about .library-figure {
  margin: 2rem 0 0;
}

.page-about .capability-figure figcaption,
.page-about .library-figure figcaption {
  margin-top: 0.625rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ash-gray);
}

.page-about .about-team-total {
  margin: 0 0 1.5rem;
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--ash-gray);
}

.page-about .about-team-total strong {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--bone-white);
}

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

.page-about .team-block {
  border: var(--border-thin);
  border-left-width: 3px;
  background: rgba(255, 255, 255, 0.03);
  transition: background 0.3s var(--ease-out), transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.page-about .team-engineers {
  --team-accent: var(--electric-cyan);
  border-left-color: var(--team-accent);
}

.page-about .team-analysts {
  --team-accent: var(--neon-volt);
  border-left-color: var(--team-accent);
}

.page-about .team-developers {
  --team-accent: var(--ash-gray);
  border-left-color: var(--team-accent);
}

.page-about .team-support {
  --team-accent: var(--signal-orange);
  border-left-color: var(--team-accent);
}

.page-about .team-block:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.3);
}

.page-about .team-block[open] {
  background: rgba(0, 229, 204, 0.04);
}

.page-about .team-block summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 1.375rem 1.25rem;
  cursor: pointer;
  list-style: none;
}

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

.page-about .team-block summary::marker {
  content: "";
}

.page-about .team-role {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--bone-white);
}

.page-about .team-count {
  font-family: var(--font-mono);
  font-size: 1.875rem;
  font-weight: 800;
  line-height: 1;
  color: var(--team-accent);
}

.page-about .team-hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--ash-gray);
}

.page-about .team-hint::after {
  content: "展开职能";
}

.page-about .team-block[open] .team-hint::after {
  content: "折叠职能";
}

.page-about .team-detail {
  padding: 0 1.25rem 1.375rem;
}

.page-about .team-detail p {
  margin: 0 0 0.625rem;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--ash-gray);
}

.page-about .team-detail ul {
  margin: 0;
  padding: 0 0 0 1rem;
  font-size: 0.8125rem;
  line-height: 1.8;
  color: var(--ash-gray);
}

.page-about .team-facts {
  margin-top: 1.5rem;
  padding: 0.75rem 0 0.75rem 1.25rem;
  border-left: 2px solid var(--electric-cyan);
}

.page-about .team-facts ul {
  display: grid;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-facts li {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--ash-gray);
}

.page-about .team-facts li::before {
  content: "//";
  margin-right: 0.25rem;
  font-family: var(--font-mono);
  color: var(--electric-cyan);
}

.page-about .about-library-intro {
  max-width: 30em;
  margin: 0 0 1.5rem;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--ash-gray);
}

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

.page-about .layer-card {
  position: relative;
  overflow: hidden;
  padding: 1.625rem 1.5rem 1.5rem;
  border: var(--border-thin);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}

.page-about .layer-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.3);
}

.page-about .layer-code {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--ash-gray);
}

.page-about .layer-card h3 {
  margin: 0.5rem 0 0.375rem;
  font-size: 1.25rem;
  font-weight: 800;
}

.page-about .layer-card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--ash-gray);
}

.page-about .layer-basic {
  background: rgba(0, 229, 204, 0.06);
  border-top: 3px solid var(--electric-cyan);
}

.page-about .layer-trend {
  background: rgba(215, 255, 63, 0.05);
  border-top: 3px solid var(--neon-volt);
}

.page-about .layer-deep {
  background: rgba(255, 122, 26, 0.06);
  border-top: 3px solid var(--signal-orange);
}

.page-about .about-more {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin-top: 3.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--mineral-slate);
}

.page-about .more-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.375rem 1.25rem;
  background: var(--glass-panel);
  border: var(--border-thin);
  color: var(--bone-white);
  text-decoration: none;
  transition: transform 0.3s var(--ease-out), border-color 0.3s var(--ease-out), background 0.3s var(--ease-out);
}

.page-about .more-card:hover {
  transform: translateY(-3px);
  border-color: var(--electric-cyan);
  background: rgba(255, 255, 255, 0.08);
}

.page-about .more-card-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--electric-cyan);
}

.page-about .more-card-title {
  font-size: 0.9375rem;
  font-weight: 700;
}

.page-about .more-card-arrow {
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--ash-gray);
  transition: color 0.3s var(--ease-out);
}

.page-about .more-card:hover .more-card-arrow {
  color: var(--neon-volt);
}

@media (min-width: 640px) {
  .page-about .capability-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .capability-card {
    grid-column: span 3;
  }

  .page-about .capability-card:nth-child(3),
  .page-about .capability-card:nth-child(4),
  .page-about .capability-card:nth-child(5) {
    grid-column: span 2;
  }

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

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

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

@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 6rem 0 4.5rem;
  }

  .page-about .about-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 4rem;
    align-items: center;
  }

  .page-about .about-hero-visual {
    margin-top: 0;
  }

  .page-about .about-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 3rem;
  }

  .page-about .about-main {
    order: unset;
    grid-column: 2;
  }

  .page-about .about-side {
    order: unset;
    grid-column: 1;
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
    max-height: calc(100vh - var(--header-h) - 3rem);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--electric-cyan) transparent;
  }

  .page-about .about-section {
    padding-top: 3.25rem;
    margin-top: 3.75rem;
  }

  .page-about .about-team-total {
    font-size: 1.125rem;
  }

  .page-about .team-map {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-more {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  .page-about [data-reveal],
  .page-about [data-reveal].is-visible {
    opacity: 1 !important;
    transform: none !important;
  }
}