:root {
  --bg: #0a0a0f;
  --bg-elevated: #12121a;
  --bg-surface: #1a1a24;
  --fg: #f0f0f5;
  --fg-muted: #8888a0;
  --accent: #00ff88;
  --accent-dim: #00ff8833;
  --border: #ffffff1a;
}

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

body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'DM Sans', system-ui, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  line-height: 1.2;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--fg);
  text-decoration: none;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  font-size: 18px;
}

.nav-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--fg-muted);
}

.status-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* Hero */
.hero {
  min-height: 100vh;
  padding: 120px 24px 80px;
  display: flex;
  align-items: center;
  background: 
    radial-gradient(ellipse 80% 50% at 50% -20%, var(--accent-dim), transparent),
    var(--bg);
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 100px;
  font-size: 13px;
  color: var(--fg-muted);
  margin-bottom: 32px;
}

.badge-pulse {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

.hero-title {
  font-size: clamp(40px, 8vw, 72px);
  margin-bottom: 24px;
  max-width: 700px;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--fg-muted);
  max-width: 560px;
  margin-bottom: 48px;
}

/* Signal Monitor */
.hero-visual {
  max-width: 560px;
}

.signal-monitor {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.monitor-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--fg-muted);
}

.status-live {
  background: var(--accent);
  color: var(--bg);
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
  font-size: 11px;
}

.monitor-graph {
  height: 120px;
  padding: 16px;
}

.monitor-graph svg {
  width: 100%;
  height: 100%;
}

.monitor-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--border);
}

.stat {
  padding: 16px;
  text-align: center;
  border-right: 1px solid var(--border);
}

.stat:last-child {
  border-right: none;
}

.stat-value {
  display: block;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 20px;
  font-weight: 600;
  color: var(--accent);
}

.stat-label {
  display: block;
  font-size: 11px;
  color: var(--fg-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 4px;
}

/* Features */
.features {
  padding: 100px 24px;
  background: var(--bg-elevated);
}

.features-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 64px;
}

.features-header h2 {
  font-size: 36px;
  margin-bottom: 16px;
}

.features-header p {
  color: var(--fg-muted);
  font-size: 18px;
}

.features-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 32px;
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-dim);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--accent);
}

.feature h3 {
  font-size: 18px;
  margin-bottom: 12px;
}

.feature p {
  color: var(--fg-muted);
  font-size: 15px;
}

/* How it works */
.how-it-works {
  padding: 100px 24px;
  background: var(--bg);
}

.how-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 64px;
}

.how-header h2 {
  font-size: 36px;
}

.steps {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.step {
  display: flex;
  gap: 24px;
  align-items: flex-start;
}

.step-number {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 48px;
  font-weight: 700;
  color: var(--accent);
  opacity: 0.3;
  line-height: 1;
}

.step-content h3 {
  font-size: 20px;
  margin-bottom: 8px;
}

.step-content p {
  color: var(--fg-muted);
}

/* Closing */
.closing {
  padding: 120px 24px;
  text-align: center;
  background: 
    radial-gradient(ellipse 60% 40% at 50% 100%, var(--accent-dim), transparent),
    var(--bg);
}

.closing-content {
  max-width: 600px;
  margin: 0 auto;
}

.closing h2 {
  font-size: clamp(28px, 5vw, 44px);
  margin-bottom: 20px;
}

.closing p {
  color: var(--fg-muted);
  font-size: 18px;
}

/* Footer */
.footer {
  padding: 40px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
}

.footer-tagline {
  color: var(--fg-muted);
  font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
  .hero {
    padding: 100px 20px 60px;
  }
  
  .hero-title {
    font-size: 36px;
  }
  
  .monitor-stats {
    grid-template-columns: 1fr;
  }
  
  .stat {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  
  .stat:last-child {
    border-bottom: none;
  }
  
  .features, .how-it-works, .closing {
    padding: 60px 20px;
  }
  
  .footer-inner {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}