:root {
  --primary: #2563eb;
  --secondary: #1e40af;
  --text: #1f2937;
  --light: #f3f4f6;
  --accent: #dbeafe;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
  line-height: 1.6;
  color: var(--text);
}

.nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: white;
  padding: 1rem;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  height: 40px;
  width: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 18px;
}

.nav-menu {
  display: flex;
  gap: 2rem;
}

.nav-link {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
}

.nav-link:hover {
  color: var(--primary);
}

.hero {
  padding: 8rem 2rem 4rem;
  background: linear-gradient(135deg, var(--accent), white);
  text-align: center;
}

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  color: var(--secondary);
}

.hero p {
  font-size: 1.25rem;
  max-width: 800px;
  margin: 0 auto 2rem;
}

.cta-button {
  display: inline-block;
  padding: 1rem 2rem;
  background: var(--primary);
  color: white;
  text-decoration: none;
  border-radius: 0.5rem;
  font-weight: 500;
  transition: background 0.3s;
}

.cta-button:hover {
  background: var(--secondary);
}

.section {
  padding: 4rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 2rem;
  text-align: center;
  color: var(--secondary);
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.feature-card {
  padding: 2rem;
  border-radius: 1rem;
  background: white;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--primary);
}

.models-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.model-card {
  padding: 2rem;
  border-radius: 1rem;
  background: white;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  border: 1px solid var(--accent);
}

.model-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  color: var(--primary);
}

.stats {
  background: var(--accent);
  padding: 4rem 2rem;
  text-align: center;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.stat-card h4 {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

footer {
  background: var(--text);
  color: white;
  padding: 4rem 2rem;
  text-align: center;
}

@media (max-width: 768px) {
  .nav-menu {
      display: none;
  }

  .hero h1 {
      font-size: 2.5rem;
  }
}