body {
  margin: 0;
  font-family: Arial, sans-serif;
  color: #222;
}

.header {
  display: flex;
  justify-content: space-between;
  padding: 20px;
  background: #0f172a;
  color: white;
}

.header nav a {
  margin: 0 10px;
  color: white;
  text-decoration: none;
}

.logo {
  font-weight: bold;
}

.btn {
  padding: 8px 14px;
  border-radius: 6px;
  background: #2563eb;
  color: white;
  text-decoration: none;
}

.hero {
  text-align: center;
  padding: 80px 20px;
  background: #f1f5f9;
}

.hero-buttons {
  margin-top: 20px;
}

.section {
  padding: 60px 20px;
  text-align: center;
}

.section.dark {
  background: #0f172a;
  color: white;
}

.grid {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}

.card {
  padding: 20px;
  background: white;
  border-radius: 10px;
  width: 200px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.footer {
  text-align: center;
  padding: 20px;
  background: #111827;
  color: white;
}