:root {
  --bg: #0a0a0f;
  --bg-elevated: #111118;
  --fg: #f0f0f5;
  --fg-muted: #888899;
  --accent-cyan: #00e5ff;
  --accent-magenta: #ff00aa;
  --border: rgba(255,255,255,0.08);
}

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

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--fg);
  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 {
  padding: 24px 48px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 20px;
  font-weight: 700;
  color: var(--fg);
}

/* Hero */
.hero {
  min-height: 80vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  padding: 80px 48px;
  align-items: center;
}

.hero-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--accent-cyan);
  margin-bottom: 24px;
}

.hero-title {
  font-size: clamp(48px, 6vw, 72px);
  font-weight: 700;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--fg) 0%, var(--fg-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  font-size: 18px;
  color: var(--fg-muted);
  max-width: 480px;
}

/* Grid Visualization */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.grid-Viz {
  position: relative;
  width: 320px;
  height: 320px;
}

.grid-line {
  position: absolute;
  background: var(--border);
}

.grid-line.horizontal {
  height: 1px;
  width: 100%;
  top: calc(var(--i) * 12.5%);
}

.grid-line.vertical {
  width: 1px;
  height: 100%;
  left: calc(var(--i) * 12.5%);
}

.grid-dot {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  opacity: 0.3;
  left: calc(var(--x) * 12.5%);
  top: calc(var(--y) * 12.5%);
  transform: translate(-50%, -50%);
}

.grid-dot.active {
  opacity: 1;
  box-shadow: 0 0 20px var(--accent-cyan), 0 0 40px var(--accent-cyan);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { transform: translate(-50%, -50%) scale(1); }
  50% { transform: translate(-50%, -50%) scale(1.2); }
}

.grid-node {
  position: absolute;
  left: calc(var(--x) * 12.5%);
  top: calc(var(--y) * 12.5%);
  transform: translate(-50%, -100%);
  background: var(--accent-cyan);
  color: var(--bg);
  font-size: 11px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 4px;
  white-space: nowrap;
}

/* Features */
.features {
  padding: 80px 48px;
  background: var(--bg-elevated);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
}

.feature-card {
  padding: 32px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  transition: border-color 0.3s, transform 0.3s;
}

.feature-card:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-4px);
}

.feature-icon {
  color: var(--accent-cyan);
  margin-bottom: 20px;
}

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

.feature-card p {
  color: var(--fg-muted);
  font-size: 14px;
}

/* How Section */
.how {
  padding: 100px 48px;
}

.how-content {
  max-width: 800px;
  margin: 0 auto;
}

.how h2 {
  font-size: 36px;
  margin-bottom: 60px;
  text-align: center;
}

.how-steps {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.step {
  display: flex;
  gap: 32px;
  align-items: flex-start;
}

.step-num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 48px;
  font-weight: 700;
  color: var(--accent-magenta);
  opacity: 0.5;
  line-height: 1;
}

.step-text h4 {
  font-size: 20px;
  margin-bottom: 8px;
}

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

/* Closing */
.closing {
  padding: 100px 48px;
  text-align: center;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-elevated) 100%);
}

.closing h2 {
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 16px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.closing p {
  color: var(--fg-muted);
  font-size: 16px;
}

/* Footer */
.footer {
  padding: 48px;
  text-align: center;
  border-top: 1px solid var(--border);
}

.footer-brand {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
}

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

/* Responsive */
@media (max-width: 768px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 60px 24px;
    gap: 48px;
  }
  
  .hero-visual {
    order: -1;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .nav {
    padding: 20px 24px;
  }
  
  .features, .how, .closing {
    padding: 60px 24px;
  }
}