body { 
            font-family: Arial, sans-serif; 
            padding: 20px; 
            background-color: #f8f8f8;
        }
        h1, h2 {
            color: #333;
        }
        
        .tabs { 
            display: flex; 
            margin-bottom: 0;
            border-bottom: 1px solid #ccc;
        }
        .tab-button { 
            padding: 10px 20px; 
            cursor: pointer; 
            border: 1px solid #ccc; 
            border-bottom: none; 
            background-color: #ccc;
            color: #555;
            border-radius: 5px 5px 0 0;
            transition: background-color 0.3s;
        }
        .tab-button:hover {
            background-color: #ddd;
        }
        .tab-button.active { 
            background-color: #fff;
            border-color: #ccc; 
            color:#000;
            border-bottom: 1px solid #fff;
            font-weight: bold;
            margin-bottom:-1px;
            z-index:10;
        }
        .tab-content { 
            border: 1px solid #ccc; 
            padding: 20px; 
            background-color: #fff;
            border-top: none;
            border-radius: 0 5px 5px 5px;
            max-width: 600px; /* Max width for content */
            margin: 0 auto; /* Center the content */
        }
        .tab-pane { 
            display: none; 
        }
        .tab-pane.active { 
            display: block; 
        }

        #matching-container { 
            margin-top: 15px; 
            padding: 15px; 
            border: 1px solid #ddd; 
            border-radius: 5px; 
            display: none; 
            background-color: #fefefe;
        }
        .mapping-row { 
            display: flex; 
            margin-bottom: 10px; 
            align-items: center; 
        }
        .mapping-row label { 
            font-weight: bold; 
            width: 150px; 
        }
        button { 
            margin-top: 20px; 
            padding: 10px 20px; 
            font-size: 16px; 
            background-color: #007bff;
            color: white; 
            border: none; 
            border-radius: 5px; 
            cursor: pointer; 
            transition: background-color 0.3s;
            width: 100%;
        }
        button:hover:not(:disabled) {
            background-color: #0056b3;
        }
        button:disabled { 
            background-color: #ccc; 
            cursor: not-allowed; 
        }

        /* Styles for inputs and results */
        .input-group {
            margin-bottom: 20px;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 4px;
        }
        select, input[type="number"], input[type="file"] {
            width: 100%;
            padding: 10px;
            margin-top: 5px;
            box-sizing: border-box;
            border: 1px solid #ccc;
            border-radius: 4px;
        }
        .resultat-box {
            margin-top: 20px;
            padding: 15px;
            border: 2px solid #28a745;
            border-radius: 5px;
            background-color: #e2ffe8;
        }
        .resultat-box h2 {
            color: #28a745;
            margin-top: 0;
        }
        label {
            display: block;
            margin-bottom: 5px;
            font-weight: bold;
        }