.upload-container {
            background: white;
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            text-align: center;
        }
        #file-input {
            display: none;
        }
        .upload-btn {
            background: #4CAF50;
            color: white;
            padding: 12px 20px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
            transition: background 0.3s;
        }
        .upload-btn:hover {
            background: #45a049;
        }
        .preview-container {
            margin: 20px 0;
            display: none;
        }
        #image-preview {
            max-width: 100%;
            max-height: 300px;
            border: 1px dashed #ddd;
        }
        .slider-container {
            margin: 25px 0;
        }
        .size-display {
            display: flex;
            justify-content: space-between;
            margin-bottom: 5px;
        }
        #width-slider {
            width: 100%;
            height: 8px;
            -webkit-appearance: none;
            background: #ddd;
            border-radius: 5px;
            outline: none;
        }
        #width-slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 20px;
            height: 20px;
            background: #4CAF50;
            border-radius: 50%;
            cursor: pointer;
        }
        #download-btn {
            background: #2196F3;
            color: white;
            padding: 12px 20px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
            display: none;
            margin-top: 15px;
        }
        .file-info {
            margin-top: 10px;
            color: #666;
            font-size: 14px;
        }
        .error {
            color: #f44336;
            margin-top: 10px;
        }