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

body {
  background-color: #0b0f19;
  color: #f8fafc;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
}

.header {
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid #1e293b;
  padding: 1rem 0;
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 900;
  color: #38bdf8;
  letter-spacing: -0.5px;
}

.nav-links a {
  color: #94a3b8;
  text-decoration: none;
  margin: 0 1rem;
  font-weight: 500;
}

.nav-links a:hover {
  color: #38bdf8;
}

.cta-btn {
  background: #0284c7;
  color: #fff;
  padding: 0.6rem 1.2rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
}

.hero {
  max-width: 1100px;
  margin: 4rem auto;
  padding: 0 1.5rem;
  text-align: center;
}

.badge {
  background: rgba(56, 189, 248, 0.15);
  color: #38bdf8;
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.hero h1 {
  font-size: 3rem;
  margin: 1.5rem 0 1rem;
  font-weight: 800;
}

.hero p {
  font-size: 1.25rem;
  color: #94a3b8;
  max-width: 700px;
  margin: 0 auto 2rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
}

.btn {
  padding: 0.8rem 1.8rem;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, #0284c7, #2563eb);
  color: white;
}

.btn-secondary {
  background: #1e293b;
  color: #f8fafc;
  border: 1px solid #334155;
}

.demo-output {
  margin-top: 2rem;
  font-size: 1.1rem;
  font-weight: 600;
  color: #22c55e;
  min-height: 2rem;
}

.features {
  max-width: 1100px;
  margin: 5rem auto;
  padding: 0 1.5rem;
}

.features h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 2.5rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.card {
  background: #1e293b;
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid #334155;
}

.card h3 {
  color: #38bdf8;
  margin-bottom: 0.75rem;
}

.footer {
  text-align: center;
  padding: 3rem 0;
  border-top: 1px solid #1e293b;
  color: #64748b;
  font-size: 0.9rem;
}