/* Global Styles */
        body {
            font-family: 'Arial', sans-serif;
            background-color: #f4f7fc;  /* Light professional background */
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            flex-direction: column;
            color: #333;
            min-height: 100vh;
            box-sizing: border-box;
        }

        h1, h2 {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        /* Navbar */
        .navbar {
            width: 100%;
            background-color: #007bff; /* Strong professional blue */
            color: white;
            padding: 15px 30px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: fixed;
            top: 0;
            left: 0;
            z-index: 1000;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
            transition: background-color 0.3s;
        }

        .navbar .logo svg {
            width: 40px;
            height: 40px;
            fill: white;
        }

        /* Page Content */
        .upload-container {
            background: #fff;
            border-radius: 15px;
            padding: 40px;
            text-align: center;
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
            max-width: 700px;
            width: 100%;
            margin-top: 100px;
            transition: transform 0.3s ease-in-out;
        }

        .upload-container:hover {
            transform: scale(1.03);
        }

        .upload-container h1 {
            font-size: 32px;
            margin-bottom: 25px;
            color: #007bff;
            font-weight: 600;
        }

        .upload-box {
            border: 2px dashed #007bff;
            border-radius: 12px;
            padding: 50px;
            background-color: #e6f7ff;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .upload-box:hover {
            border-color: #0056b3;
            background-color: #b3e0ff;
        }

        .upload-box i {
            font-size: 60px;
            color: #007bff;
        }

        .upload-box p {
            font-size: 18px;
            color: #555;
            margin-top: 15px;
            font-weight: 600;
        }

        #fileInput {
            display: none;
        }

        .btn {
            background: linear-gradient(135deg, #28a745, #218838);
            color: white;
            padding: 15px 28px;
            font-size: 18px;
            border-radius: 30px;
            border: none;
            cursor: pointer;
            margin-top: 30px;
            display: none;
            transition: background-color 0.3s ease;
            width: 100%;
        }

        .btn:hover {
            background: linear-gradient(135deg, #218838, #28a745);
        }

        .preview-container {
            margin-top: 30px;
            display: none;
        }

        .preview-container h2 {
            font-size: 24px;
            margin-bottom: 20px;
            color: #333;
        }

        .preview-container img {
            max-width: 100%;
            border-radius: 10px;
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
        }

        .download-btn {
            background: linear-gradient(135deg, #28a745, #218838);
            margin-top: 20px;
        }

        .download-btn:hover {
            background: linear-gradient(135deg, #218838, #28a745);
        }

        .loader {
            display: none;
            margin: 30px auto;
            border: 4px solid #f3f3f3;
            border-top: 4px solid #007bff;
            border-radius: 50%;
            width: 50px;
            height: 50px;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .navbar .logo svg {
                height: 30px;
            }

            .upload-container {
                padding: 25px;
                margin-top: 100px;
            }

            .upload-box {
                padding: 50px;
            }

            .btn {
                width: 100%;
            }
        }