body {
      font-family: Arial, sans-serif;
      line-height: 1.6;
      padding: 20px;
      max-width: 1200px;
      margin: 0 auto;
      color: #333;
    }
    
    h1 {
      color: #2c3e50;
      text-align: center;
      margin-bottom: 20px;
    }
    
    .description {
      text-align: center;
      margin-bottom: 20px;
      color: #7f8c8d;
    }
    
    .input-group {
      margin-bottom: 15px;
    }
    
    label {
      display: block;
      margin-bottom: 5px;
      font-weight: bold;
    }
    
    input, textarea, select {
      width: 100%;
      border: 1px solid #ddd;
      border-radius: 4px;
      font-family: inherit;
    }
    
    textarea {
      min-height: 100px;
    }
    
    .btn {
      background-color: #3498db;
      color: white;
      border: none;
      padding: 10px 15px;
      border-radius: 4px;
      cursor: pointer;
      font-size: 16px;
      width: 100%;
      margin: 5px 0;
    }
    
    .btn:hover {
      background-color: #2980b9;
    }
    
    .btn-encrypt {
      background-color: #27ae60;
    }
    
    .btn-decrypt {
      background-color: #e74c3c;
    }
    
    .file-upload {
      margin-bottom: 15px;
    }
    
    .result-table {
      width: 100%;
      border-collapse: collapse;
      margin: 15px 0;
    }
    
    .result-table th, .result-table td {
      border: 1px solid #ddd;
      padding: 8px;
      text-align: left;
    }
    
    .result-table th {
      background-color: #f2f2f2;
    }
    
    .error {
      color: #e74c3c;
    }
    
    .action-buttons {
      display: flex;
      gap: 10px;
      margin: 15px 0;
    }
    
    .action-buttons .btn {
      margin: 0;
    }
    
    .algorithm-selector {
      margin-bottom: 15px;
      text-align: center;
    }
    
    .algorithm-selector label {
      display: inline-block;
      margin-right: 15px;
      cursor: pointer;
    }
    
    .input-mode-selector {
      margin-bottom: 15px;
      text-align: center;
    }
    
    .input-mode-selector label {
      display: inline-block;
      margin-right: 15px;
      cursor: pointer;
    }
    
    .input-section {
      margin-bottom: 20px;
      padding: 15px;
      border: 1px solid #ddd;
      border-radius: 4px;
    }
    
    .bit-comparison {
      margin: 15px 0;
      padding: 10px;
      background-color: #f8f9fa;
      border-radius: 4px;
    }
    
    .avalanche-section {
      margin: 20px 0;
      padding: 15px;
      border: 2px solid #3498db;
      border-radius: 4px;
      background-color: #f8f9fa;
    }
    
    .avalanche-result {
      margin: 10px 0;
      padding: 10px;
      background-color: white;
      border-radius: 4px;
    }
    
    .avalanche-stats {
      display: flex;
      justify-content: space-between;
      margin-top: 10px;
    }
    
    .stat-box {
      flex: 1;
      padding: 10px;
      margin: 0 5px;
      background-color: #e8f4fd;
      border-radius: 4px;
      text-align: center;
    }
    
    .key-comparison {
      display: flex;
      gap: 20px;
      margin: 15px 0;
    }
    
    .key-group {
      flex: 1;
      padding: 10px;
      border: 1px solid #ddd;
      border-radius: 4px;
      background-color: white;
    }
    
    .input-comparison {
      display: flex;
      gap: 20px;
      margin: 15px 0;
    }
    
    .input-group-comparison {
      flex: 1;
    }
    
    @media (max-width: 768px) {
      .avalanche-stats {
        flex-direction: column;
      }
      
      .stat-box {
        margin: 5px 0;
      }
      
      .key-comparison, .input-comparison {
        flex-direction: column;
      }
    }