.dropzone {
            border: 2px dashed #0087F7;
            border-radius: 5px;
            background: white;
            padding: 50px;
            text-align: center;
            font: 20px Arial, sans-serif;
            color: #0087F7;
            margin-bottom: 20px;
            transition: background 0.3s;
        }
        .dropzone.dragover {
            background: #e0e7ff;
        }
        .hidden {
            display: none;
        }
        #passwordPopup, #confirmationPopup {
            display: none;
            position: fixed;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            background-color: white;
            padding: 20px;
            border: 2px solid #0087F7;
            border-radius: 5px;
            box-shadow: 0px 0px 10px 0px rgba(0, 0, 0, 0.1);
        }
        #progressBarContainer {
            width: 100%;
            background-color: #f3f3f3;
            border-radius: 5px;
            margin-top: 20px;
            display: none;
        }
        #progressBar {
            width: 0;
            height: 20px;
            background-color: #4caf50;
            border-radius: 5px;
        }
        #loadingSpinner {
            display: none;
            position: fixed;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
        }
        #fileSizeInfo {
            margin-top: 20px;
            font-size: 14px;
            color: #666;
        }
        #fileList {
            margin-top: 20px;
            font-size: 14px;
            color: #333;
        }
        #fileList li {
            margin-bottom: 5px;
        }
        #totalFileSize, #zipFileSize {
            margin-top: 10px;
            font-size: 14px;
            color: #333;
        }