body {
  font-family: Arial, sans-serif;
  margin: 20px;
  background: #f9f9f9;
}

.header {
  text-align: center;
  margin-bottom: 30px;
}

.logo {
  max-width: 150px;
}

h1 {
  color: #333;
}

#materie-container {
  margin: 20px 0;
  padding: 10px;
}

.materia-card {
  display: inline-block;
  width: 250px;
  margin: 10px;
  padding: 15px;
  border: 1px solid #ddd;
  background: white;
  border-radius: 8px;
  cursor: pointer;
  transition: 0.2s;
}

.materia-card:hover {
  background: #eef;
}

.materia-card.selezionata {
  background: #cce5ff;
  border: 2px solid #004999;
}

#calendar {
  max-width: 900px;
  margin: 40px auto;
  background: #fff;
  padding: 10px;
  border: 1px solid #ddd;
}

button {
  padding: 10px 15px;
  background: #0066cc;
  color: white;
  border: none;
  cursor: pointer;
}

button:hover {
  background: #004999;
}