body {
  font-family: Arial, sans-serif;
  background: #f4f4f9;
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 480px;
  margin: 0 auto;
  background: white;
  padding: 25px;
  border-radius: 8px;
  box-shadow: 0 0 12px rgba(0,0,0,0.1);
}

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

label {
  display: block;
  margin: 15px 0 6px;
  font-weight: bold;
}

select, input[type=number] {
  width: 100%;
  padding: 8px;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}

button {
  margin-top: 20px;
  width: 100%;
  background: #007bff;
  color: white;
  font-size: 1.1rem;
  padding: 10px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background: #0056b3;
}

.results {
  margin-top: 25px;
  font-size: 1.2rem;
  background: #e9ecef;
  padding: 15px;
  border-radius: 6px;
  color: #222;
}