body {
  background: #f0f2f5;
  font-family: 'Segoe UI', sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.calculator-container {
  background: white;
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
  width: 300px;
  text-align: center;
}

.calculator-container h2 {
  margin-bottom: 1rem;
}

input[type="number"] {
  width: 100%;
  padding: 0.6rem;
  font-size: 1rem;
  margin-bottom: 1rem;
  border-radius: 8px;
  border: 1px solid #ccc;
}

.radio-buttons {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.radio-buttons label {
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

button {
  width: 100%;
  padding: 0.6rem;
  font-size: 1rem;
  border: none;
  background: #4CAF50;
  color: white;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s;
}

button:hover {
  background: #45a049;
}

.result-display {
  margin-top: 1rem;
  font-weight: bold;
  color: #333;
}