:root {
  --bg: #09090b;
  --bg-elevated: #18181b;
  --bg-card: #1c1c1f;
  --fg: #fafafa;
  --fg-muted: #a1a1aa;
  --fg-subtle: #71717a;
  --accent: #22d3ee;
  --accent-dim: rgba(34, 211, 238, 0.15);
  --border: rgba(255, 255, 255, 0.08);
  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.25rem 2rem;
  background: rgba(9, 9, 11, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: -0.02em;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8rem 2rem 6rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-glow {
  position: absolute;
  top: 30%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 600px;
  background: radial-gradient(ellipse, var(--accent-dim) 0%, transparent 70%);
  opacity: 0.6;
}

.hero-content {
  position: relative;
  max-width: 900px;
  text-align: center;
  z-index: 1;
}

.hero-tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.5rem 1rem;
  border-radius: 2rem;
  margin-bottom: 2rem;
}

.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 5.5rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  background: linear-gradient(180deg, var(--fg) 0%, var(--fg-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: 1.25rem;
  color: var(--fg-muted);
  max-width: 640px;
  margin: 0 auto 4rem;
  line-height: 1.7;
}

.hero-visual {
  display: flex;
  justify-content: center;
}

.flow-diagram {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.flow-node {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1rem 1.5rem;
  text-align: center;
}

.flow-node--ai {
  background: linear-gradient(135deg, var(--bg-card) 0%, rgba(34, 211, 238, 0.1) 100%);
  border-color: var(--accent);
}

.flow-label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.875rem;
  display: block;
}

.flow-sub {
  font-size: 0.75rem;
  color: var(--accent);
  display: block;
  margin-top: 0.25rem;
}

.flow-arrow {
  color: var(--fg-subtle);
  font-size: 1.5rem;
}

/* Features */
.features {
  padding: 8rem 2rem;
  background: var(--bg);
}

.features-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 4rem;
}

.features-header h2 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.features-header p {
  font-size: 1.125rem;
  color: var(--fg-muted);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.feature {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 2rem;
  transition: border-color 0.3s ease;
}

.feature:hover {
  border-color: var(--accent);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--accent-dim);
  border-radius: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: 1.5rem;
}

.feature h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.feature p {
  color: var(--fg-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
}

/* How it works */
.how-it-works {
  padding: 8rem 2rem;
  background: var(--bg-elevated);
}

.how-content {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.how-text h2 {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.how-text p {
  color: var(--fg-muted);
  font-size: 1.0625rem;
  line-height: 1.7;
  margin-bottom: 2rem;
}

.how-list {
  list-style: none;
}

.how-list li {
  color: var(--fg);
  font-size: 1rem;
  padding: 0.75rem 0;
  padding-left: 1.5rem;
  position: relative;
}

.how-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
}

.how-visual {
  display: flex;
  justify-content: center;
}

.insight-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.75rem;
  max-width: 400px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.insight-header {
  margin-bottom: 1rem;
}

.insight-badge {
  font-family: var(--font-display);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.375rem 0.75rem;
  border-radius: 0.25rem;
}

.insight-text {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--fg);
  margin-bottom: 1.25rem;
}

.insight-meta {
  font-size: 0.75rem;
  color: var(--fg-subtle);
}

/* Closing */
.closing {
  padding: 10rem 2rem;
  text-align: center;
  background: var(--bg);
}

.closing-content {
  max-width: 700px;
  margin: 0 auto;
}

.closing h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.closing p {
  font-size: 1.25rem;
  color: var(--fg-muted);
}

/* Footer */
.footer {
  padding: 4rem 2rem;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.footer-tagline {
  color: var(--fg-muted);
  font-size: 0.9375rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero {
    padding: 7rem 1.5rem 5rem;
    min-height: auto;
  }
  
  .hero-sub {
    font-size: 1.0625rem;
  }
  
  .how-content {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .features, .how-it-works {
    padding: 5rem 1.5rem;
  }
  
  .closing {
    padding: 6rem 1.5rem;
  }
  
  .flow-diagram {
    gap: 0.75rem;
  }
  
  .flow-node {
    padding: 0.75rem 1rem;
  }
  
  .flow-arrow {
    font-size: 1.25rem;
  }
}

@media (max-width: 480px) {
  .flow-diagram {
    flex-direction: column;
  }
  
  .flow-arrow {
    transform: rotate(90deg);
  }
}