.page-about {
  --about-accent: #7B2FDE;
  --about-accent-bright: #9B4DFF;
  --about-gold: #F5A623;
  --about-bg-panel: rgba(255,255,255,0.04);
  --about-line: rgba(255,255,255,0.12);
  --about-text-secondary: rgba(168,198,240,0.8);
  --about-font-heading: "Montserrat","Noto Sans SC","Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  --about-font-body: "JetBrains Mono","Roboto Mono","Noto Sans SC","Segoe UI","PingFang SC","Microsoft YaHei",monospace;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about {
  position: relative;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--about-font-body);
  line-height: 1.7;
  overflow-x: hidden;
}

.page-about .container {
  max-width: 1280px;
  padding-left: 24px;
  padding-right: 24px;
  margin-left: auto;
  margin-right: auto;
}

.page-about a {
  color: inherit;
  text-decoration: none;
}

.page-about .breadcrumb {
  padding: 88px 0 0;
}

.page-about .breadcrumb-inner {
  padding-top: 4px;
  padding-bottom: 4px;
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
}

.page-about .breadcrumb-link {
  color: var(--color-text-secondary);
  transition: color 0.2s var(--ease);
}

.page-about .breadcrumb-link:hover {
  color: var(--color-accent-bright);
}

.page-about .breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
}

.page-about .about-hero {
  position: relative;
  padding: 48px 0 64px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -200px;
  width: 560px;
  height: 560px;
  background: radial-gradient(circle, rgba(123,47,222,0.3) 0%, rgba(123,47,222,0) 70%);
  pointer-events: none;
}

.page-about .about-hero-inner {
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.page-about .hero-intro {
  position: relative;
  max-width: 720px;
}

.page-about .section-label {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  font-family: var(--about-font-heading);
}

.page-about .section-no {
  font-size: 15px;
  font-weight: 800;
  color: var(--about-gold);
  letter-spacing: 0.1em;
}

.page-about .section-tag {
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-pill);
  letter-spacing: 0.2em;
  color: var(--color-text-secondary);
  text-transform: uppercase;
}

.page-about .hero-intro h1 {
  margin: 0 0 20px;
  font-family: var(--about-font-heading);
  font-size: 32px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.page-about .hero-desc {
  margin: 0 0 32px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-text-secondary);
}

.page-about .hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
}

.page-about .meta-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .meta-label {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(168,198,240,0.6);
}

.page-about .meta-value {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
}

.page-about .hero-visual {
  position: relative;
  max-width: 620px;
}

.page-about .hero-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-line);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.page-about .hero-orbit {
  position: absolute;
  border-radius: var(--radius-pill);
  pointer-events: none;
}

.page-about .hero-orbit-a {
  top: -16px;
  left: -16px;
  width: 96px;
  height: 96px;
  border: 1px solid rgba(245,166,35,0.5);
  animation: pulse 3s ease-in-out infinite alternate;
}

.page-about .hero-orbit-b {
  bottom: -20px;
  right: -14px;
  width: 120px;
  height: 48px;
  border: 1px solid rgba(123,47,222,0.5);
  transform: rotate(-18deg);
}

@keyframes pulse {
  0% { transform: scale(0.95); opacity: 0.5; }
  100% { transform: scale(1.05); opacity: 1; }
}

.page-about .about-layout {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 48px;
  padding: 0 24px 88px;
}

.page-about .about-sidebar {
  position: relative;
  width: 100%;
  flex-shrink: 0;
}

.page-about .sidebar-sticky {
  position: relative;
}

.page-about .sidebar-title {
  font-family: var(--about-font-heading);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(168,198,240,0.6);
  margin-bottom: 16px;
}

.page-about .sidebar-nav {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 13px;
}

.page-about .sidebar-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  background: var(--about-bg-panel);
  border: 1px solid transparent;
  color: var(--color-text-secondary);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .sidebar-link .link-no {
  font-size: 12px;
  color: var(--about-gold);
  font-weight: 700;
}

.page-about .sidebar-link:hover {
  color: var(--color-text);
  border-color: rgba(123,47,222,0.4);
  background: rgba(123,47,222,0.12);
}

.page-about .sidebar-link.is-active {
  color: var(--color-text);
  border-color: rgba(123,47,222,0.6);
  background: rgba(123,47,222,0.16);
}

.page-about .sidebar-foot {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  background: var(--about-bg-panel);
}

.page-about .sidebar-note {
  margin: 0;
  font-size: 12px;
  line-height: 1.6;
  color: rgba(168,198,240,0.7);
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--about-font-body);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--about-line);
  background: transparent;
  color: var(--color-text);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .btn-ghost {
  font-size: 13px;
  padding: 8px 18px;
}

.page-about .btn-ghost:hover {
  border-color: rgba(123,47,222,0.6);
  background: rgba(123,47,222,0.12);
  color: var(--color-text);
}

.page-about .btn-primary {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.page-about .btn-primary:hover {
  background: var(--color-accent-bright);
  border-color: var(--color-accent-bright);
}

.page-about .btn-sm {
  font-size: 13px;
  padding: 8px 18px;
}

.page-about .about-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 88px;
}

.page-about .about-section {
  scroll-margin-top: 110px;
}

.page-about .section-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--about-line);
  padding-bottom: 14px;
}

.page-about .section-head .section-no {
  font-size: 15px;
  font-weight: 700;
  color: var(--about-gold);
}

.page-about .section-head h2 {
  margin: 0;
  font-family: var(--about-font-heading);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .overview-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .panel {
  position: relative;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-lg);
  padding: 28px;
  background: var(--about-bg-panel);
  overflow: hidden;
}

.page-about .panel-line {
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
}

.page-about .panel-accent {
  background: linear-gradient(135deg, rgba(123,47,222,0.16), rgba(11,27,58,0.6));
}

.page-about .panel-accent .panel-line {
  background: linear-gradient(to bottom, var(--about-gold), transparent);
}

.page-about .panel-title {
  margin: 0 0 14px;
  font-family: var(--about-font-heading);
  font-size: 18px;
  font-weight: 700;
}

.page-about .panel-text {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(168,198,240,0.85);
}

.page-about .panel-text:last-child {
  margin-bottom: 0;
}

.page-about .overview-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.page-about .tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  font-family: var(--about-font-body);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(123,47,222,0.4);
  background: rgba(123,47,222,0.1);
  color: var(--color-text-secondary);
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .tag:hover {
  background: rgba(123,47,222,0.24);
  color: #fff;
}

.page-about .milestone-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-bottom: 32px;
  border: 1px solid var(--about-line);
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent), var(--color-line), var(--about-gold));
  opacity: 0.5;
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 36px 40px;
  transition: background 0.2s var(--ease);
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: var(--radius-pill);
  background: var(--color-bg);
  border: 3px solid var(--about-gold);
  box-shadow: 0 0 0 4px rgba(11,27,58,0.8);
  transition: box-shadow 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .timeline-item:hover::before {
  transform: scale(1.12);
  box-shadow: 0 0 0 6px rgba(245,166,35,0.18);
}

.page-about .timeline-item.is-current::before {
  background: var(--about-gold);
  box-shadow: 0 0 0 5px rgba(245,166,35,0.15);
}

.page-about .timeline-date {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--about-gold);
  margin-bottom: 6px;
}

.page-about .timeline-content {
  position: relative;
  padding: 22px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  background: var(--about-bg-panel);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .timeline-content:hover {
  border-color: rgba(123,47,222,0.4);
  background: rgba(123,47,222,0.08);
}

.page-about .timeline-title {
  margin: 0 0 10px;
  font-family: var(--about-font-heading);
  font-size: 17px;
  font-weight: 700;
}

.page-about .timeline-desc {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-text-secondary);
}

.page-about .milestone-rails {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .rail {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: rgba(168,198,240,0.75);
}

.page-about .rail-dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-pill);
  background: var(--color-accent-bright);
  flex-shrink: 0;
}

.page-about .rail-text {
  font-size: 13px;
  line-height: 1.5;
}

.page-about .stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 36px;
}

.page-about .glass-card {
  position: relative;
  padding: 24px;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.08);
  transition: background 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .glass-card:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(123,47,222,0.4);
}

.page-about .stat-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(168,198,240,0.7);
  margin-bottom: 10px;
}

.page-about .stat-value {
  font-family: var(--about-font-heading);
  font-size: 34px;
  font-weight: 800;
  line-height: 1.1;
  color: var(--color-text);
  margin-bottom: 10px;
  letter-spacing: -0.03em;
}

.page-about .glass-card:nth-child(2) .stat-value {
  color: var(--about-gold);
}

.page-about .glass-card:nth-child(5) .stat-value {
  color: var(--color-success);
}

.page-about .stat-desc {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(168,198,240,0.75);
}

.page-about .chart-panel {
  padding: 24px;
}

.page-about .chart-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 24px;
}

.page-about .chart-title {
  font-family: var(--about-font-heading);
  font-size: 18px;
  font-weight: 700;
}

.page-about .chart-subtitle {
  margin: 6px 0 0;
  font-size: 13px;
  color: var(--color-text-secondary);
}

.page-about .badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(123,47,222,0.5);
  color: var(--color-accent-bright);
  background: rgba(123,47,222,0.12);
}

.page-about .badge-accent {
  border-color: var(--color-accent);
}

.page-about .chart-body {
  overflow-x: auto;
}

.page-about .chart-axes {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 320px;
  padding: 4px 0;
}

.page-about .chart-bar-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .bar-label {
  flex: 0 0 84px;
  font-size: 12px;
  font-weight: 500;
  color: rgba(168,198,240,0.7);
  text-align: right;
}

.page-about .bar-track {
  position: relative;
  flex: 1;
  height: 30px;
  background: rgba(11,27,58,0.6);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.page-about .bar-fill {
  display: block;
  height: 100%;
  min-width: 8px;
  border-radius: var(--radius-sm);
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-bright));
  transition: background 0.2s var(--ease);
}

.page-about .bar-fill:hover {
  filter: brightness(1.2);
}

.page-about .bar-value-text {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 12px;
  font-weight: 600;
  color: rgba(255,255,255,0.9);
  background: rgba(11,27,58,0.45);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

.page-about .chart-foot {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--about-line);
}

.page-about .chart-note {
  font-size: 12px;
  color: rgba(168,198,240,0.65);
  padding-left: 12px;
  position: relative;
}

.page-about .chart-note::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-pill);
  background: var(--color-accent-bright);
}

.page-about .mgrid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .mgrid-panel {
  padding: 26px;
}

.page-about .panel-icon {
  margin-bottom: 18px;
}

.page-about .version-example {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
  align-items: center;
}

.page-about .version-badge {
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  background: rgba(245,166,35,0.15);
  color: var(--about-gold);
  border: 1px solid rgba(245,166,35,0.4);
}

.page-about .version-text {
  font-size: 12px;
  font-family: var(--about-font-body);
  color: rgba(168,198,240,0.7);
  letter-spacing: 0.05em;
}

.page-about .update-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
}

.page-about .flow-node {
  font-size: 12px;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--about-line);
  background: rgba(255,255,255,0.06);
}

.page-about .flow-arrow {
  color: var(--about-gold);
  font-size: 14px;
}

.page-about .dimension-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.page-about .flow-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  font-size: 13px;
  color: rgba(168,198,240,0.8);
}

.page-about .flow-item {
  font-weight: 600;
  color: var(--color-text);
}

.page-about .about-cta {
  margin-top: 8px;
}

.page-about .cta-panel {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 36px 30px;
  border-radius: var(--radius-lg);
  background: linear-gradient(120deg, rgba(123,47,222,0.2), rgba(11,27,58,0.8));
  border: 1px solid rgba(123,47,222,0.35);
  overflow: hidden;
}

.page-about .cta-panel::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 200px;
  height: 200px;
  border-radius: var(--radius-pill);
  background: rgba(245,166,35,0.06);
  pointer-events: none;
}

.page-about .cta-title {
  margin: 0 0 10px;
  font-family: var(--about-font-heading);
  font-size: 22px;
  font-weight: 800;
}

.page-about .cta-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(168,198,240,0.85);
  position: relative;
  z-index: 1;
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  position: relative;
  z-index: 1;
}

.page-about .cta-actions .btn-primary {
  font-size: 13px;
}

.page-about .cta-actions .btn-ghost {
  font-size: 13px;
}

.page-about ul,
.page-about ol {
  padding-left: 0;
}

@media (min-width: 640px) {
  .page-about .hero-intro h1 {
    font-size: 40px;
  }

  .page-about .overview-grid {
    grid-template-columns: 1fr 1fr;
  }

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

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

  .page-about .chart-foot {
    flex-direction: row;
    gap: 24px;
  }

  .page-about .about-hero-inner {
    display: grid;
    grid-template-columns: 7fr 5fr;
    gap: 40px;
    align-items: center;
  }

  .page-about .hero-intro {
    max-width: none;
  }
}

@media (min-width: 860px) {
  .page-about .about-layout {
    flex-direction: row;
    gap: 56px;
    align-items: flex-start;
    padding-left: 24px;
    padding-right: 24px;
    padding-bottom: 100px;
  }

  .page-about .about-sidebar {
    width: 220px;
    position: sticky;
    top: 96px;
    flex-shrink: 0;
  }

  .page-about .sidebar-sticky {
    position: static;
  }

  .page-about .sidebar-nav {
    flex-direction: column;
    gap: 4px;
  }

  .page-about .sidebar-link {
    padding: 11px 16px;
    border-radius: var(--radius-sm);
    font-size: 13px;
  }

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

  .page-about .about-content {
    flex: 1;
    min-width: 0;
    gap: 100px;
  }
}

@media (min-width: 1024px) {
  .page-about .hero-intro h1 {
    font-size: 44px;
  }

  .page-about .hero-desc {
    font-size: 16px;
  }

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

  .page-about .section-head h2 {
    font-size: 28px;
  }

  .page-about .timeline-item {
    padding-left: 48px;
  }

  .page-about .tline-date {
    font-size: 13px;
  }
}

.page-about :focus-visible {
  outline: 2px solid var(--color-accent-bright);
  outline-offset: 2px;
}

.page-about .hero-img,
.page-about .milestone-img {
  height: auto;
  object-fit: cover;
}