body {
    margin: 0;
    padding: 0;
    font-family: "Segoe UI", Arial, sans-serif;
    background: #25aae1;
    color: #003b55;
    text-align: center;
  }
  
  header {
    background: #003b55;
    color: #ffffff;
    padding: 1.5rem;
    border-bottom-left-radius: 20px;
    border-bottom-right-radius: 20px;
  }
  
  .logo {
    height: 80px;
    width: auto;
    vertical-align: middle;
  }
  
  main {
    margin: 2rem auto;
    width: 90%;
    max-width: 400px;
    background: #c1e2f3;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
  }
  
  .option-container {
    display: flex;
    justify-content: center;
    margin-bottom: 1rem;
  }
  
  .radio-label {
    margin: 0 0.5rem;
    cursor: pointer;
  }
  
  input[type="number"] {
    display: block;
    margin: 0.5rem auto; /* centers the element */
    width: 100%;
    max-width: 300px;
    padding: 0.75rem;
    border: 1px solid #003b55;
    border-radius: 10px;
    background: #e2f2f9;
    color: #003b55;
    font-size: 1rem;
  }
  
  button {
    width: 100%;
    padding: 0.75rem;
    background: #003b55;
    color: #ffffff;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    cursor: pointer;
  }
  
  button:hover {
    opacity: 0.9;
  }
  
  #result {
    margin-top: 1rem;
    text-align: left;
  }
  
  #result p {
    margin: 0.5rem 0;
  }