body {
    font-family: Arial, sans-serif;
    background-color: #f3f3f3;
    padding: 20px;
    color: #222;
    transition: background-color 0.3s, color 0.3s;
  }
  .container {
    max-width: 900px;
    margin: auto;
    background-color: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    transition: background-color 0.3s, color 0.3s;
  }
  h2 {
    text-align: center;
    color: #4b0082;
  }
  form {
    display: grid;
    gap: 15px;
  }
  label {
    font-weight: bold;
  }
  input, select, button {
    padding: 10px;
    font-size: 16px;
    width: 100%;
    border: 1px solid #ccc;
    border-radius: 4px;
    transition: background-color 0.3s, color 0.3s;
  }
  button {
    background-color: #6a0dad;
    color: white;
    border: none;
    cursor: pointer;
  }
  button:hover {
    background-color: #560aaf;
  }
  table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
  }
  table, th, td {
    border: 1px solid #ddd;
  }
  th, td {
    padding: 12px;
    text-align: center;
  }
  th {
    background-color: #f0f0f0;
  }
  .results {
    margin-top: 30px;
  }
  .btn-group {
    margin-top: 15px;
    display: flex;
    gap: 15px;
    justify-content: center;
  }
  .btn-group button {
    width: auto;
    padding: 10px 25px;
  }