:root {
  --bg-dark: #0A0618;
  --bg-surface: #130D2E;
  --bg-card: rgba(26, 17, 58, 0.65);
  --bg-card-hover: rgba(38, 25, 84, 0.85);
  --border-subtle: rgba(168, 85, 247, 0.2);
  --border-glow: rgba(168, 85, 247, 0.45);
  --border-cyan: rgba(6, 182, 212, 0.35);

  --neon-violet: #A855F7;
  --neon-purple: #C084FC;
  --neon-cyan: #06B6D4;
  --neon-cyan-light: #22D3EE;
  --electric-blue: #3B82F6;

  --text-primary: #FFFFFF;
  --text-secondary: #E2E8F0;
  --text-muted: #94A3B8;

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", Consolas, "SF Mono", monospace;

  --transition-fast: 0.18s ease;
  --transition-normal: 0.25s ease;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

/* Background Particle Canvas */
#quantumCanvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 0;
  opacity: 0.75;
}

.cosmic-nebula-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(140px);
  pointer-events: none;
  z-index: 0;
}
.glow-purple {
  width: 550px;
  height: 550px;
  background: radial-gradient(circle, rgba(168, 85, 247, 0.15) 0%, transparent 70%);
  top: -120px;
  right: -80px;
}
.glow-cyan {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.12) 0%, transparent 70%);
  bottom: -150px;
  left: -100px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Site Header */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  height: 68px;
  background: rgba(10, 6, 24, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 100;
  transition: all var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
  flex-shrink: 0;
}

.brand-icon {
  width: 36px;
  height: 36px;
  filter: drop-shadow(0 0 10px rgba(168, 85, 247, 0.6));
  transition: transform var(--transition-normal);
}
.brand-wrap:hover .brand-icon {
  transform: rotate(15deg) scale(1.08);
}

.brand-text {
  display: flex;
  flex-direction: column;
}
.brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  background: linear-gradient(120deg, #FFFFFF 20%, #C084FC 70%, #22D3EE 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 6px;
}
.lab-tag {
  font-size: 0.62rem;
  font-family: var(--font-mono);
  background: rgba(168, 85, 247, 0.2);
  color: var(--neon-cyan-light);
  border: 1px solid var(--border-glow);
  padding: 1px 6px;
  border-radius: 4px;
}
.brand-sub {
  font-size: 0.68rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Desktop Nav */
.desktop-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}
.desktop-nav a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.desktop-nav a:hover {
  color: #FFFFFF;
  background: rgba(168, 85, 247, 0.15);
}
.desktop-nav a.active {
  color: var(--neon-cyan-light);
  background: rgba(6, 182, 212, 0.14);
  border: 1px solid var(--border-cyan);
  font-weight: 600;
}

/* Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.btn-lab-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, #9333EA 0%, #06B6D4 100%);
  color: #FFFFFF;
  font-size: 0.85rem;
  font-weight: 700;
  text-decoration: none;
  transition: all var(--transition-normal);
  box-shadow: 0 0 16px rgba(168, 85, 247, 0.4);
}
.btn-lab-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 24px rgba(6, 182, 212, 0.6);
  filter: brightness(1.1);
}

.btn-lab-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  background: rgba(26, 17, 58, 0.6);
  border: 1px solid var(--border-glow);
  color: var(--neon-cyan-light);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  transition: all var(--transition-normal);
}
.btn-lab-outline:hover {
  background: rgba(168, 85, 247, 0.2);
  border-color: var(--neon-cyan);
  color: #FFFFFF;
}

/* Mobile Toggle */
.mobile-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: #FFFFFF;
  padding: 6px;
  border-radius: 6px;
  cursor: pointer;
}

/* Hero Section */
.hero-section {
  padding: 70px 0 50px;
  text-align: center;
  position: relative;
}
.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 14px;
  border-radius: 9999px;
  background: rgba(168, 85, 247, 0.12);
  border: 1px solid var(--border-glow);
  color: var(--neon-purple);
  font-size: 0.78rem;
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.hero-title {
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1.25;
  color: #FFFFFF;
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}
.hero-highlight {
  background: linear-gradient(120deg, #C084FC 0%, #22D3EE 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 780px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

/* Radar Telemetry Box */
.radar-box {
  background: var(--bg-card);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 24px;
  backdrop-filter: blur(12px);
  margin: 30px auto;
  max-width: 900px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5), inset 0 0 20px rgba(168, 85, 247, 0.08);
}

.radar-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 18px;
}
.radar-item {
  background: rgba(10, 6, 24, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
}
.radar-item-val {
  font-size: 1.6rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--neon-cyan-light);
  margin-bottom: 4px;
}
.radar-item-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Feature Cards Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin: 40px 0;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-glow);
  background: var(--bg-card-hover);
  box-shadow: 0 12px 30px rgba(168, 85, 247, 0.2);
}
.feature-icon-wrap {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid var(--border-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--neon-cyan-light);
  font-size: 1.3rem;
  margin-bottom: 18px;
}
.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 10px;
}
.feature-card p {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 18px;
}

/* Article List & Tag Cloud */
.article-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.article-card:hover {
  border-color: var(--neon-cyan);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(6, 182, 212, 0.2);
}

.tag-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-family: var(--font-mono);
  background: rgba(168, 85, 247, 0.12);
  color: var(--neon-purple);
  border: 1px solid var(--border-subtle);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: rgba(10, 6, 24, 0.95);
  padding: 50px 0 25px;
  margin-top: 60px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 40px;
}
.footer-col h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
  text-transform: uppercase;
}
.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 0.86rem;
  transition: color var(--transition-fast);
}
.footer-col a:hover {
  color: var(--neon-cyan-light);
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 900px) {
  .desktop-nav { display: none; }
  .mobile-toggle { display: block; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: 2.1rem; }
  .radar-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .footer-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 1.75rem; }
}