body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background-color: #f4f4f4;
    color: #333;
  }

  h1 {
    text-align: center;
    margin: 20px 0;
    color: #2c3e50;
  }

  .input-section {
    text-align: center;
    margin-bottom: 20px;
  }

  input#cifFile {
    margin: 15px auto;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    cursor: pointer;
  }

  .plane-input-group {
    margin-top: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
  }

  .plane-input-group label {
    font-weight: bold;
  }

  .plane-input-group input[type="text"] {
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    width: 80px;
    text-align: center;
  }

  .plane-input-group button {
    padding: 8px 15px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s ease;
  }

  .plane-input-group button:hover {
    background-color: #2980b9;
  }

  p#status {
    text-align: center;
    color: #555;
    font-style: italic;
    margin-top: 10px;
  }

  div#message {
    text-align: center;
    margin: 10px 0;
    font-weight: bold;
  }


  .cif-summary {
    background-color: #e9f5ff;
    border: 1px solid #cceeff;
    border-radius: 8px;
    padding: 15px 25px;
    margin: 20px auto;
    max-width: 600px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  }

  .cif-summary h3 {
    color: #3498db;
    margin-top: 0;
    border-bottom: 1px solid #add8e6;
    padding-bottom: 5px;
    margin-bottom: 10px;
  }

  .cif-summary p, .cif-summary ul {
    margin: 5px 0;
    line-height: 1.5;
  }

  .cif-summary ul {
    list-style-type: none;
    padding-left: 0;
  }

  .cif-summary ul li {
    margin-bottom: 3px;
  }

  .cif-summary strong {
    color: #2c3e50;
  }


  .container {
    display: flex;
    justify-content: center; /* Center the boxes horizontally */
    flex-wrap: wrap; /* Allows wrapping on smaller screens */
    padding: 20px;
    gap: 20px;
  }

  .box {
    flex: 1; /* Allow boxes to grow/shrink */
    min-width: 300px;
    max-width: 48%;
    aspect-ratio: 1/1;
    border: 1px solid #ccc;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    overflow: hidden; /* Ensures content stays within bounds */
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: white;
  }

  .box h2 {
    margin: 15px 0;
    color: #34495e;
  }

  #structureCanvas, #diffractionCanvas {
    width: 100%;
    flex-grow: 1;
    min-height: 0; /* Important for flex items with height */
  }

  /* Responsive adjustments */
  @media (max-width: 768px) {
    .box {
      max-width: 95%; /* Stack boxes vertically on smaller screens */
    }
  }