body {
  margin: 0;
  font-family: Arial, sans-serif;
  line-height: 1.6;
  scroll-behavior: smooth;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: #fff;
  position: sticky;
  top: 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar ul {
  list-style: none;
  display: flex;
  gap: 1rem;
}

.navbar a {
  text-decoration: none;
  color: #333;
}

.hero {
  text-align: center;
  padding: 5rem 2rem;
  background: linear-gradient(to bottom right, #93c5fd, #fff);
}

.hero h2 {
  font-size: 2.5rem;
}

.btn {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.75rem 1.5rem;
  background: #2563eb;
  color: #fff;
  text-decoration: none;
  border-radius: 5px;
}

.section {
  padding: 4rem 2rem;
  text-align: center;
}

.courses .grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.card {
  background: #fff;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

footer {
  text-align: center;
  padding: 2rem;
  background: #f9fafb;
  margin-top: 2rem;
}