.upload-box { border: 2px dashed #007bff; padding: 20px; text-align: center; cursor: pointer; transition: all 0.3s; }
    .upload-box:hover { background-color: #f0f8ff; }
    .progress-container { width: 100%; background-color: #ddd; border-radius: 5px; margin-top: 10px; }
    .progress-bar { height: 8px; background-color: #4caf50; width: 0%; border-radius: 5px; }