/* General Styles */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Arial', sans-serif;
            background-color: #f5f5f5;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }

        .container {
            background-color: #fff;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            text-align: center;
            max-width: 400px;
            width: 100%;
        }

        h1 {
            font-size: 2rem;
            color: #333;
            margin-bottom: 1rem;
        }

        p {
            color: #666;
            margin-bottom: 1.5rem;
        }

        /* Upload Area */
        .upload-area {
            position: relative;
            margin-bottom: 1.5rem;
        }

        .upload-label {
            display: block;
            width: 100%;
            padding: 1rem;
            background-color: #4CAF50;
            color: white;
            text-align: center;
            border-radius: 5px;
            cursor: pointer;
            transition: background-color 0.3s ease;
        }

        .upload-label:hover {
            background-color: #45a049;
        }

        input[type="file"] {
            display: none;
        }

        /* Preview Area */
        .preview-area {
            text-align: center;
        }

        #previewImage {
            max-width: 100%;
            max-height: 150px;
            margin-bottom: 1rem;
            border-radius: 5px;
        }

        #barcodeResult {
            font-size: 1.2rem;
            color: #333;
        }

        .hidden {
            display: none;
        }