.page-about {
  --about-sidebar-width: 236px;
  --about-ring-empty: rgba(255, 255, 255, 0.07);
  color: var(--text-primary);
}

.page-about .breadcrumb {
  margin-top: 24px;
  font-size: 0.8125rem;
}

.page-about .about-hero {
  position: relative;
  padding: 56px 0 28px;
  overflow: hidden;
  background-image: linear-gradient(rgba(57, 255, 20, 0.035) 1px, transparent 1px), linear-gradient(90deg, rgba(57, 255, 20, 0.035) 1px, transparent 1px);
  background-size: 44px 44px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -180px;
  right: -140px;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(57, 255, 20, 0.12), transparent 70%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  display: grid;
  gap: 36px;
  align-items: center;
  position: relative;
}

.page-about .about-hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(57, 255, 20, 0.08);
  border: 1px solid rgba(57, 255, 20, 0.28);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  margin-bottom: 24px;
}

.page-about .about-hero-kicker::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.8);
}

.page-about .about-hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 7.2vw, 4.4rem);
  line-height: 1.04;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 22px;
}

.page-about .about-hero-title-accent {
  display: block;
  background: linear-gradient(120deg, var(--accent) 20%, #00D2FF 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-hero-lead {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text-muted);
  max-width: 56ch;
  margin: 0 0 28px;
}

.page-about .about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero-meta-item {
  font-size: 0.8125rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 6px 14px;
  background: rgba(18, 24, 38, 0.6);
}

.page-about .about-hero-media {
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid rgba(57, 255, 20, 0.14);
  box-shadow: 0 0 48px rgba(57, 255, 20, 0.08);
}

.page-about .about-hero-media img,
.page-about .about-data-img img,
.page-about .about-milestone-img img {
  width: 100%;
  height: auto;
  display: block;
}

.page-about .about-hero-media-tag {
  position: absolute;
  left: 16px;
  bottom: 16px;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--background);
  background: var(--accent);
  border-radius: var(--radius-pill);
  padding: 5px 12px;
  font-weight: 700;
}

.page-about .about-statband {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  margin-top: 24px;
  padding: 28px 0;
}

.page-about .about-statband-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.page-about .about-statband-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  padding-left: 14px;
}

.page-about .about-statband-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--accent), transparent);
}

.page-about .about-statband-value {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent);
  line-height: 1;
}

.page-about .about-statband-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.page-about .about-layout {
  padding-top: 40px;
  padding-bottom: 64px;
}

.page-about .about-toc {
  margin-bottom: 32px;
}

.page-about .about-toc-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 12px;
}

.page-about .about-toc-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-toc-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 8px 14px;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .about-toc-link:hover {
  border-color: rgba(57, 255, 20, 0.5);
  color: var(--accent);
}

.page-about .about-toc-link span {
  font-family: var(--font-heading);
  font-size: 0.72rem;
  color: var(--accent);
}

.page-about .about-toc-foot {
  display: none;
}

.page-about .about-doc {
  min-width: 0;
}

.page-about .about-section {
  scroll-margin-top: 96px;
  position: relative;
  padding-left: 18px;
  border-left: 1px solid rgba(192, 192, 192, 0.18);
}

.page-about .about-section::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--accent), rgba(57, 255, 20, 0));
  opacity: 0.9;
}

.page-about .about-section + .about-section {
  margin-top: 72px;
}

.page-about .about-section .section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.page-about .about-section .section-index {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--background);
  background: linear-gradient(135deg, var(--accent), #00D2FF);
  border-radius: 50%;
}

.page-about .about-section .section-title {
  font-family: var(--font-heading);
  font-size: var(--text-h3);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0;
}

.page-about .about-section .section-lead {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-muted);
  margin: 0 0 24px;
  max-width: 60ch;
}

.page-about .about-mission-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  padding: 24px;
  display: grid;
  gap: 20px;
}

.page-about .about-mission-copy p {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--text-primary);
  margin: 0 0 14px;
}

.page-about .about-mission-copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-mission-quote {
  margin: 0;
  padding: 20px;
  border-left: 2px solid var(--accent);
  background: rgba(57, 255, 20, 0.05);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.page-about .about-mission-quote p {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--text-primary);
  margin: 0 0 8px;
}

.page-about .about-mission-quote cite {
  font-style: normal;
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.page-about .about-data-img {
  margin: 0 0 28px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}

.page-about .about-data-grid {
  display: grid;
  gap: 14px;
  margin-bottom: 20px;
}

.page-about .about-data-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px 20px 20px 76px;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-data-card:hover {
  border-color: rgba(57, 255, 20, 0.45);
  transform: translateY(-2px);
}

.page-about .about-data-card-index {
  position: absolute;
  left: 16px;
  top: 16px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--accent);
  border: 1px solid rgba(57, 255, 20, 0.35);
  border-radius: var(--radius-md);
  background: rgba(57, 255, 20, 0.06);
}

.page-about .about-data-card h3 {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  margin: 0 0 8px;
}

.page-about .about-data-card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--text-muted);
}

.page-about .about-update-strip {
  display: flex;
  gap: 12px;
  background: rgba(57, 255, 20, 0.07);
  border: 1px solid rgba(57, 255, 20, 0.2);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  font-size: 0.875rem;
  line-height: 1.7;
}

.page-about .about-update-strip::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 14px var(--accent);
  margin-top: 8px;
}

.page-about .about-update-strip strong {
  color: var(--accent);
  font-weight: 700;
}

.page-about .about-tech-grid {
  display: grid;
  gap: 24px;
}

.page-about .about-tech-main {
  display: grid;
  gap: 14px;
}

.page-about .about-tech-item {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 18px;
}

.page-about .about-tech-item-index {
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 800;
  color: var(--accent);
  padding-top: 2px;
}

.page-about .about-tech-item h3 {
  font-family: var(--font-heading);
  font-size: 1rem;
  margin: 0 0 6px;
}

.page-about .about-tech-item p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-muted);
}

.page-about .about-tech-side {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.page-about .about-tech-ring {
  text-align: center;
}

.page-about .about-tech-ring p {
  margin: 10px 0 0;
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.page-about .about-ring {
  width: 92px;
  height: 92px;
  margin: 0 auto;
  border-radius: 50%;
  background: conic-gradient(var(--accent) 0 144deg, var(--about-ring-empty) 144deg 360deg);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.page-about .about-ring--sci {
  background: conic-gradient(var(--accent) 0 90deg, var(--about-ring-empty) 90deg 360deg);
}

.page-about .about-ring::before {
  content: "";
  position: absolute;
  inset: 9px;
  border-radius: 50%;
  background: var(--surface);
}

.page-about .about-ring span {
  position: relative;
  z-index: 1;
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--accent);
}

.page-about .about-tech-side-note {
  grid-column: 1 / -1;
  margin: 6px 0 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
  line-height: 1.7;
  border-top: 1px dashed rgba(192, 192, 192, 0.15);
  padding-top: 16px;
}

.page-about .about-milestone-img {
  margin: 0 0 32px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}

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

.page-about .about-timeline-item {
  position: relative;
  padding-left: 28px;
  padding-bottom: 28px;
  border-left: 1px solid rgba(192, 192, 192, 0.18);
  margin-left: 8px;
}

.page-about .about-timeline-item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .about-timeline-dot {
  position: absolute;
  left: -6px;
  top: 4px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 14px rgba(57, 255, 20, 0.55);
}

.page-about .about-timeline-summary {
  cursor: pointer;
}

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

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

.page-about .about-timeline-period {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 6px;
}

.page-about .about-timeline-title {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  font-weight: 800;
  margin: 0;
  display: inline-block;
}

.page-about .accordion-body p {
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--text-muted);
  margin: 0;
}

.page-about .about-commitment-grid {
  display: grid;
  gap: 14px;
}

.page-about .about-commitment-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 2px solid var(--accent);
  border-radius: var(--radius-md);
  padding: 20px;
}

.page-about .about-commitment-card h3 {
  font-family: var(--font-heading);
  font-size: 1.0625rem;
  margin: 0 0 10px;
}

.page-about .about-commitment-card p {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-muted);
  margin: 0 0 8px;
}

.page-about .about-commitment-card a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 255, 20, 0.35);
}

.page-about .about-closing {
  margin-top: 80px;
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--surface), var(--surface-alt));
  padding: 36px 24px;
  overflow: hidden;
}

.page-about .about-closing::before {
  content: "数据档案";
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: clamp(4rem, 12vw, 7rem);
  line-height: 1;
  color: rgba(255, 255, 255, 0.03);
  position: absolute;
  right: 8px;
  bottom: 0;
  letter-spacing: -0.04em;
  pointer-events: none;
}

.page-about .about-closing-index {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.page-about .about-closing-title {
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 4vw, 2.2rem);
  font-weight: 800;
  line-height: 1.25;
  margin: 0 0 14px;
  max-width: 20em;
}

.page-about .about-closing-copy {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--text-muted);
  max-width: 44em;
  margin-bottom: 24px;
}

.page-about .about-closing-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 860px) {
  .page-about .about-hero {
    padding: 72px 0 48px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    gap: 56px;
  }

  .page-about .about-statband {
    margin-top: 32px;
    padding: 36px 0;
  }

  .page-about .about-statband-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }

  .page-about .about-statband-value {
    font-size: 2.4rem;
  }

  .page-about .about-layout {
    display: grid;
    grid-template-columns: var(--about-sidebar-width) minmax(0, 1fr);
    gap: 64px;
    align-items: start;
    padding-top: 56px;
    padding-bottom: 88px;
  }

  .page-about .about-toc {
    position: sticky;
    top: 96px;
    margin: 0;
    align-self: start;
  }

  .page-about .about-toc-label {
    display: inline-block;
    padding: 8px 18px;
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-bottom: 0;
    border-radius: 10px 10px 0 0;
    margin: 0;
  }

  .page-about .about-toc-nav {
    display: block;
    border: 1px solid var(--border);
    border-radius: 0 var(--radius-md) var(--radius-md) var(--radius-md);
    background: rgba(18, 24, 38, 0.6);
    padding: 14px 0 8px;
    margin-top: -1px;
  }

  .page-about .about-toc-link {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.875rem;
    background: none;
    border: 0;
    border-radius: 0;
    padding: 11px 18px;
    border-bottom: 1px dashed rgba(192, 192, 192, 0.12);
  }

  .page-about .about-toc-link:last-child {
    border-bottom: 0;
  }

  .page-about .about-toc-link span {
    min-width: 24px;
    font-size: 0.75rem;
  }

  .page-about .about-toc-foot {
    display: block;
    margin-top: 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
  }

  .page-about .about-toc-foot p:first-child {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin: 0 0 6px;
  }

  .page-about .about-toc-foot p:last-child {
    font-size: 0.8125rem;
    color: var(--text-primary);
    line-height: 1.6;
    margin: 0;
  }

  .page-about .about-section + .about-section {
    margin-top: 96px;
  }

  .page-about .about-section .section-title {
    font-size: var(--text-h2);
  }

  .page-about .about-section .section-lead {
    font-size: 1.0625rem;
  }

  .page-about .about-mission-card {
    grid-template-columns: 1.3fr 0.7fr;
    gap: 28px;
    padding: 32px;
  }

  .page-about .about-data-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-about .about-tech-grid {
    grid-template-columns: minmax(0, 1fr) 280px;
    gap: 28px;
    align-items: start;
  }

  .page-about .about-tech-side {
    grid-template-columns: 1fr;
    justify-items: center;
    align-content: start;
    gap: 22px;
    padding: 24px 18px;
    position: sticky;
    top: 96px;
  }

  .page-about .about-tech-side-note {
    grid-column: 1;
    text-align: left;
  }

  .page-about .about-commitment-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-about .about-closing {
    margin-top: 104px;
    padding: 56px 48px;
  }

  .page-about .about-closing-links {
    gap: 12px;
  }
}