body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            margin: 0;
            padding: 20px;
            background-color: #f5f5f5;
            color: #333;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: white;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0,0,0,0.1);
        }
        h1 {
            text-align: center;
            color: #2c3e50;
            margin-bottom: 30px;
        }
        .upload-section {
            text-align: center;
            padding: 30px;
            border: 2px dashed #ccc;
            border-radius: 5px;
            margin-bottom: 20px;
            background-color: #f9f9f9;
        }
        .upload-section:hover {
            border-color: #999;
        }
        #pdf-upload {
            display: none;
        }
        .upload-btn {
            background-color: #3498db;
            color: white;
            padding: 10px 20px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 16px;
            transition: background-color 0.3s;
        }
        .upload-btn:hover {
            background-color: #2980b9;
        }
        .quality-selector {
            margin: 20px 0;
            text-align: center;
        }
        .quality-btn {
            padding: 8px 15px;
            margin: 0 5px;
            border: 1px solid #ddd;
            background-color: #f8f8f8;
            cursor: pointer;
            border-radius: 4px;
            transition: all 0.3s;
        }
        .quality-btn.active {
            background-color: #3498db;
            color: white;
            border-color: #2980b9;
        }
        .gallery {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-top: 20px;
            justify-content: center;
        }
        .image-container {
            position: relative;
            width: 200px;
            height: 280px;
            overflow: hidden;
            border: 1px solid #ddd;
            border-radius: 4px;
            background-color: white;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            transition: transform 0.3s;
        }
        .image-container:hover {
            transform: translateY(-5px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        .thumbnail {
            width: 100%;
            height: 200px;
            object-fit: contain;
            cursor: pointer;
            background-color: #f5f5f5;
        }
        .image-info {
            padding: 10px;
            text-align: center;
        }
        .download-btn {
            background-color: #2ecc71;
            color: white;
            border: none;
            padding: 5px 10px;
            border-radius: 3px;
            cursor: pointer;
            font-size: 14px;
            transition: background-color 0.3s;
        }
        .download-btn:hover {
            background-color: #27ae60;
        }
        .download-all-btn {
            display: block;
            margin: 20px auto;
            background-color: #e67e22;
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 4px;
            cursor: pointer;
            font-size: 16px;
            transition: background-color 0.3s;
        }
        .download-all-btn:hover {
            background-color: #d35400;
        }
        .modal {
            display: none;
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0,0,0,0.9);
            overflow: auto;
        }
        .modal-content {
            display: block;
            margin: auto;
            max-width: 90%;
            max-height: 90%;
            margin-top: 50px;
        }
        .close {
            position: absolute;
            top: 15px;
            right: 35px;
            color: #f1f1f1;
            font-size: 40px;
            font-weight: bold;
            cursor: pointer;
        }
        .status {
            text-align: center;
            margin: 20px 0;
            font-style: italic;
            color: #7f8c8d;
        }
        .loading {
            display: none;
            text-align: center;
            margin: 20px 0;
        }
        .spinner {
            border: 5px solid #f3f3f3;
            border-top: 5px solid #3498db;
            border-radius: 50%;
            width: 50px;
            height: 50px;
            animation: spin 1s linear infinite;
            margin: 0 auto;
            color: red;
        }
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        .features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
            padding: 15px;
            margin-top: 30px;
        }
        
        .feature {
            background-color: #fff;
            padding: 20px;
            margin: auto;
            border-radius: 8px;
            height: 15rem;
            box-shadow: 0 5px 12px rgba(0, 0, 0, 0.05);
        }
        
        .feature-icon {
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 15px;
        }
        
        .feature-title {
            font-size: 1.2rem;
            margin-bottom: 10px;
            color: var(--secondary-color);
        }
        
        @media (max-width: 768px) {
            .features {
                grid-template-columns: 1fr;
            }
        }