* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            color: #333;
            overflow-x: hidden;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 20px;
        }

        .header {
            text-align: center;
            margin-bottom: 40px;
            animation: slideDown 0.8s ease-out;
        }

        .header h1 {
            font-size: 3rem;
            font-weight: 700;
            color: white;
            text-shadow: 0 4px 20px rgba(0,0,0,0.3);
            margin-bottom: 10px;
        }

        .header p {
            font-size: 1.2rem;
            color: rgba(255,255,255,0.9);
            font-weight: 300;
        }

        .lab-container {
            background: rgba(255,255,255,0.95);
            backdrop-filter: blur(20px);
            border-radius: 24px;
            padding: 40px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.1);
            border: 1px solid rgba(255,255,255,0.2);
            animation: slideUp 0.8s ease-out 0.2s both;
        }

        .upload-zone {
            border: 3px dashed #667eea;
            border-radius: 16px;
            padding: 60px 20px;
            text-align: center;
            margin-bottom: 30px;
            transition: all 0.3s ease;
            cursor: pointer;
            position: relative;
            overflow: hidden;
        }

        .upload-zone:hover {
            border-color: #764ba2;
            background: linear-gradient(135deg, rgba(102,126,234,0.05) 0%, rgba(118,75,162,0.05) 100%);
            transform: translateY(-2px);
        }

        .upload-zone.dragover {
            border-color: #4caf50;
            background: rgba(76,175,80,0.1);
            transform: scale(1.02);
        }

        .upload-icon {
            font-size: 4rem;
            color: #667eea;
            margin-bottom: 20px;
            animation: float 3s ease-in-out infinite;
        }

        .upload-text {
            font-size: 1.3rem;
            color: #555;
            margin-bottom: 10px;
            font-weight: 500;
        }

        .upload-subtext {
            color: #888;
            font-size: 0.95rem;
        }

        .controls-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-bottom: 30px;
        }

        .control-section {
            background: rgba(255,255,255,0.7);
            padding: 25px;
            border-radius: 16px;
            border: 1px solid rgba(0,0,0,0.1);
        }

        .control-section h3 {
            color: #333;
            margin-bottom: 20px;
            font-size: 1.2rem;
            font-weight: 600;
        }

        .control-group {
            margin-bottom: 20px;
        }

        .control-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: #555;
        }

        .control-help {
            font-size: 0.8rem;
            color: #888;
            margin-top: 4px;
            font-style: italic;
        }

        .slider-container {
            position: relative;
            margin-bottom: 10px;
        }

        .slider {
            width: 100%;
            height: 8px;
            border-radius: 5px;
            background: linear-gradient(to right, #667eea, #764ba2);
            outline: none;
            -webkit-appearance: none;
            cursor: pointer;
        }

        .slider::-webkit-slider-thumb {
            appearance: none;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: white;
            box-shadow: 0 2px 10px rgba(0,0,0,0.2);
            cursor: pointer;
            transition: transform 0.2s ease;
        }

        .slider::-webkit-slider-thumb:hover {
            transform: scale(1.2);
        }

        .slider-value {
            position: absolute;
            right: 0;
            top: -25px;
            background: #333;
            color: white;
            padding: 4px 8px;
            border-radius: 6px;
            font-size: 0.85rem;
            font-weight: 500;
        }

        .format-selector {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }

        .format-btn {
            padding: 10px 20px;
            border: 2px solid #667eea;
            background: white;
            color: #667eea;
            border-radius: 25px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 500;
            font-size: 0.9rem;
        }

        .format-btn:hover {
            background: #667eea;
            color: white;
            transform: translateY(-2px);
        }

        .format-btn.active {
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            box-shadow: 0 4px 15px rgba(102,126,234,0.3);
        }

        .preview-section {
            margin-top: 30px;
        }

        .preview-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-top: 20px;
        }

        .preview-card {
            background: white;
            border-radius: 16px;
            padding: 20px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
            border: 1px solid rgba(0,0,0,0.1);
        }

        .preview-card h4 {
            margin-bottom: 15px;
            color: #333;
            font-size: 1.1rem;
            font-weight: 600;
        }

        .image-container {
            position: relative;
            border-radius: 12px;
            overflow: hidden;
            margin-bottom: 15px;
            background: #f8f9fa;
            min-height: 200px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .preview-image {
            max-width: 100%;
            max-height: 300px;
            object-fit: contain;
            transition: transform 0.3s ease;
        }

        .preview-image:hover {
            transform: scale(1.05);
        }

        .image-stats {
            display: flex;
            justify-content: space-between;
            font-size: 0.9rem;
            color: #666;
        }

        .stat-item {
            text-align: center;
        }

        .stat-value {
            font-weight: 600;
            color: #333;
            font-size: 1.1rem;
        }

        .compression-ratio {
            background: linear-gradient(135deg, #4caf50, #45a049);
            color: white;
            padding: 8px 16px;
            border-radius: 20px;
            font-weight: 600;
            margin-top: 10px;
            text-align: center;
        }

        .download-btn {
            width: 100%;
            padding: 15px;
            background: linear-gradient(135deg, #667eea, #764ba2);
            color: white;
            border: none;
            border-radius: 12px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-top: 15px;
        }

        .download-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(102,126,234,0.3);
        }

        .download-btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none;
        }

        .progress-bar {
            width: 100%;
            height: 6px;
            background: #e0e0e0;
            border-radius: 3px;
            overflow: hidden;
            margin: 20px 0;
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, #667eea, #764ba2);
            width: 0%;
            transition: width 0.3s ease;
        }

        .advanced-options {
            margin-top: 20px;
            padding: 20px;
            background: rgba(102,126,234,0.05);
            border-radius: 12px;
            border: 1px solid rgba(102,126,234,0.1);
        }

        .advanced-toggle {
            background: none;
            border: none;
            color: #667eea;
            font-weight: 600;
            cursor: pointer;
            font-size: 1rem;
            margin-bottom: 15px;
        }

        .advanced-content {
            display: none;
        }

        .advanced-content.show {
            display: block;
            animation: slideDown 0.3s ease-out;
        }

        @keyframes slideDown {
            from { opacity: 0; transform: translateY(-20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        @keyframes slideUp {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        @keyframes float {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(-10px); }
        }

        .hidden {
            display: none;
        }

        @media (max-width: 768px) {
            .controls-grid, .preview-grid {
                grid-template-columns: 1fr;
            }
            
            .header h1 {
                font-size: 2rem;
            }
            
            .lab-container {
                padding: 20px;
            }
        }