body {
    background: #f8f9fa;
    padding: 30px;
  }
  
  .card {
    max-width: 600px;
    margin: auto;
    border-radius: 20px;
    box-shadow: 0 0 10px rgba(0,0,0,0.08);
  }
  
  .form-label {
    font-weight: 600;
  }
  
  .result {
    font-size: 1.2rem;
    font-weight: bold;
  }