body {
  margin: 0;
  font-family: Arial;
  background: #0f172a;
  color: white;
}

nav {
  display: flex;
  justify-content: space-between;
  padding: 20px;
  background: #020617;
}

nav a {
  color: white;
  margin-left: 15px;
  text-decoration: none;
}

.hero {
  text-align: center;
  padding: 100px 20px;
  background: linear-gradient(135deg,#2563eb,#7c3aed);
}

.btn {
  display: inline-block;
  margin-top: 20px;
  padding: 10px 20px;
  background: #22c55e;
  color: white;
  text-decoration: none;
  border-radius: 8px;
}

.section {
  padding: 50px 20px;
  text-align: center;
}

.card {
  background: #1e293b;
  padding: 20px;
  margin: 20px auto;
  width: 250px;
  border-radius: 10px;
}