:root {
            --primary-color: #4CAF50;
            --secondary-color: #45a049;
            --background-color: #f9f9f9;
            --text-color: #333;
            --border-color: #ddd;
        }
        body {
            font-family: Arial, sans-serif;
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
            background-color: var(--background-color);
            color: var(--text-color);
            line-height: 1.6;
        }
        .container {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }
        h1 {
            text-align: center;
            color: var(--primary-color);
            margin-bottom: 20px;
        }
        #dropZone {
            border: 2px dashed var(--border-color);
            padding: 40px;
            text-align: center;
            background: white;
            cursor: pointer;
            transition: all 0.3s ease;
            border-radius: 8px;
        }
        #dropZone.dragover {
            background: #e1e1e1;
            border-color: var(--primary-color);
        }
        #result {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 20px;
        }
        .image-card {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 15px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        .image-card img {
            max-width: 100%;
            height: auto;
            border-radius: 4px;
        }
        .image-info {
            margin-top: 10px;
            font-size: 0.9em;
        }
        .size-comparison {
            color: var(--primary-color);
            font-weight: bold;
        }
        button {
            padding: 10px 20px;
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 0.9em;
            transition: background-color 0.3s ease;
        }
        button:hover {
            background-color: var(--secondary-color);
        }
        .card-download-btn {
            margin-top: 10px;
            width: 100%;
        }
        #actionButtons {
            display: flex;
            gap: 10px;
            justify-content: center;
            margin-top: 20px;
        }
        #downloadAllBtn, #clearAllBtn {
            padding: 12px 24px;
            display: none;
        }
        #error {
            color: red;
            text-align: center;
            display: none;
            margin: 10px 0;
        }
        #loading {
            display: none;
            text-align: center;
            font-size: 1.2em;
            color: var(--primary-color);
            margin: 20px 0;
        }
        @media (max-width: 768px) {
            #result {
                grid-template-columns: 1fr;
            }
            #dropZone {
                padding: 20px;
            }
            #actionButtons {
                flex-direction: column;
            }
            #downloadAllBtn, #clearAllBtn {
                width: 100%;
            }
        }