body {
            margin: 0;
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            background-color: #f5f5f5;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
        }

        .upload-container {
            background: white;
            padding: 2rem;
            border-radius: 10px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            text-align: center;
            width: 90%;
            max-width: 1400px;
            min-width: 800px;
            min-height: 600px;
            height: 80vh;
            max-height: 800px;
            overflow-y: auto;
        }

        .upload-button {
            display: inline-block;
            position: relative;
            cursor: pointer;
            margin-bottom: 1rem;
        }

        .upload-button input[type="file"] {
            position: absolute;
            left: 0;
            top: 0;
            opacity: 0;
            cursor: pointer;
            width: 100%;
            height: 100%;
        }

        .upload-button label {
            display: inline-block;
            padding: 12px 24px;
            background-color: #4CAF50;
            color: white;
            border-radius: 5px;
            transition: background-color 0.3s;
            cursor: pointer;
        }

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

        .file-info {
            margin-top: 1rem;
            color: #666;
            font-size: 0.9rem;
            margin-bottom: 1rem;
        }

        .submit-button {
            padding: 12px 24px;
            background-color: #2196F3;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 1rem;
            transition: background-color 0.3s;
            display: none;
        }

        .submit-button:hover {
            background-color: #1976D2;
        }

        .submit-button:disabled {
            background-color: #ccc;
            cursor: not-allowed;
        }

        .spinner {
            display: none;
            width: 20px;
            height: 20px;
            margin-left: 10px;
            border: 3px solid #f3f3f3;
            border-top: 3px solid #2196F3;
            border-radius: 50%;
            animation: spin 1s linear infinite;
            vertical-align: middle;
        }

        .upload-info {
            margin-top: 15px;
            text-align: center;
            font-weight: 500;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .button-container {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 10px;
        }