body {
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  padding: 20px;
}

form {
  background: white;
  padding: 20px;
  border-radius: 10px;
  max-width: 500px;
  margin: auto;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

label {
  display: block;
  margin-top: 10px;
}

input,
select {
  width: 100%;
  padding: 8px;
  margin-top: 4px;
  border: 1px solid #ccc;
  border-radius: 5px;
}

.subform {
  display: none;
  margin-top: 15px;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
  background: #fafafa;
}

button {
  margin-top: 15px;
  padding: 10px 15px;
  border: none;
  border-radius: 5px;
  background: #007bff;
  color: white;
  cursor: pointer;
}

button:hover {
  background: #0056b3;
}