body 
        {
            font-family: Arial, sans-serif;
            margin: 20px;
            line-height: 1.6;
        }
        .container {
            max-width: 900px;
            margin: 0 auto;
            text-align: center;
        }
        textarea {
            padding: 10px;
            border: 1px solid #ccc;
            border-radius: 5px;
            font-family: monospace;
            width: 100%;
            max-width: 500px;
            min-height: 150px;
        }
        button {
            padding: 10px 20px;
            background-color: #007bff;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            margin: 10px 0;
            font-size: 16px;
        }
        button:hover {
            background-color: #0056b3;
        }
        button:disabled {
            background-color: #cccccc;
            cursor: not-allowed;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            display: none;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        }
        th, td {
            padding: 12px;
            text-align: left;
            border: 1px solid #ddd;
        }
        th {
            background-color: #007bff;
            color: white;
        }
        tr:nth-child(even) {
            background-color: #f9f9f9;
        }
        tr:hover {
            background-color: #f1f1f1;
        }
        .loading-spinner {
            display: inline-block;
            width: 20px;
            height: 20px;
            border: 3px solid #f3f3f3;
            border-top: 3px solid #007bff;
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        .notification {
            padding: 10px;
            margin: 10px 0;
            border-radius: 5px;
            display: none;
        }
        .error {
            background-color: #ffebee;
            color: #c62828;
            border: 1px solid #c62828;
        }
        .warning {
            background-color: #fff8e1;
            color: #ff8f00;
            border: 1px solid #ff8f00;
        }
        .success {
            background-color: #e8f5e9;
            color: #2e7d32;
            border: 1px solid #2e7d32;
        }
        .summary {
            padding: 15px;
            margin: 20px 0;
            background-color: #e3f2fd;
            border-radius: 5px;
            font-weight: bold;
            display: none;
        }
        .progress-container {
            width: 100%;
            background-color: #f1f1f1;
            border-radius: 5px;
            margin: 10px 0;
            display: none;
        }
        .progress-bar {
            height: 20px;
            background-color: #4caf50;
            border-radius: 5px;
            width: 0%;
            transition: width 0.3s;
        }
        .result-valid {
            color: #2e7d32;
            font-weight: bold;
        }
        .result-nil {
            color: #666;
            font-weight: bold;
        }
        .result-error {
            color: #c62828;
            font-weight: bold;
        }