body {
  font-family: Arial, sans-serif;
  background: #f0f4f8;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 500px;
  margin: 40px auto;
  background: white;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1 {
  text-align: center;
  color: #333;
}

input, select {
  display: block;
  width: 100%;
  margin: 10px 0;
  padding: 10px;
  font-size: 16px;
}

.button-row {
  display: flex;
  justify-content: space-between;
  margin-top: 20px;
}

.btn {
  padding: 10px 20px;
  background: #007bff;
  border: none;
  color: white;
  cursor: pointer;
  border-radius: 4px;
}

.btn:hover {
  background: #0056b3;
}

.step {
  display: none;
}

.step.active {
  display: block;
}

.result {
  font-size: 20px;
  text-align: center;
  margin: 20px 0;
  color: green;
}

footer {
  text-align: center;
  padding: 15px;
  background-color: #eaeaea;
  font-size: 14px;
  color: #333;
}