:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #13131a;
  --bg-tertiary: #1a1a24;
  --text-primary: #e8e8f0;
  --text-secondary: #a8a8b8;
  --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --accent-color: #667eea;
  --border-color: #2a2a35;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

.header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container { display: flex; justify-content: space-between; align-items: center; }

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav { display: flex; gap: 2rem; }
.nav a { color: var(--text-secondary); text-decoration: none; transition: color 0.3s; }
.nav a:hover { color: var(--text-primary); }

.hero {
  padding: 6rem 0;
  text-align: center;
}

.hero-title {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.btn {
  padding: 0.75rem 2rem;
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s;
  display: inline-block;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

.demos { padding: 4rem 0; }

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 3rem;
}

.demos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.demo-card {
  background: var(--bg-secondary);
  padding: 2rem;
  border-radius: 1rem;
  border: 1px solid var(--border-color);
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.3s;
  display: block;
}

.demo-card:hover {
  border-color: var(--accent-color);
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(102, 126, 234, 0.2);
}

.demo-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.demo-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.demo-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  text-align: center;
  color: var(--text-secondary);
}

@media (max-width: 768px) {
  .hero-title { font-size: 2rem; }
  .demos-grid { grid-template-columns: 1fr; }
}