body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f8fafc;
  color: #333;
}

header {
  background: white;
  padding: 15px 50px;
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid #ddd;
}

header h1 {
  color: #0077b6;
}

nav a {
  margin-left: 20px;
  text-decoration: none;
  color: #333;
}

.hero {
  background: url('images/arduino-kids.jpg') center/cover;
  color: white;
  padding: 100px 50px;
  text-align: center;
}

.hero h2 {
  font-size: 40px;
}

.btn {
  background: #0077b6;
  color: white;
  padding: 12px 25px;
  text-decoration: none;
  border-radius: 5px;
}

.section {
  padding: 50px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px,1fr));
  gap: 20px;
}

.card {
  background: white;
  padding: 20px;
  border-radius: 10px;
}

footer {
  text-align: center;
  padding: 20px;
  background: #222;
  color: white;
}