* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 20px;
        }
        
        .container {
            max-width: 1400px;
            margin: 0 auto;
        }
        
        header {
            background: white;
            border-radius: 20px 20px 0 0;
            padding: 30px;
            text-align: center;
            box-shadow: 0 10px 30px rgba(0,0,0,0.1);
        }
        
        h1 {
            font-size: 2.5rem;
            color: #333;
            margin-bottom: 10px;
        }
        
        h1 i {
            color: #667eea;
            margin-right: 10px;
        }
        
        .subtitle {
            color: #666;
            font-size: 1.1rem;
        }
        
        .features {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-top: 20px;
            flex-wrap: wrap;
        }
        
        .feature {
            background: #f0f4ff;
            padding: 8px 20px;
            border-radius: 50px;
            color: #667eea;
            font-weight: 500;
        }
        
        .main-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            background: #f5f7fa;
            padding: 20px;
        }
        
        @media (max-width: 900px) {
            .main-content {
                grid-template-columns: 1fr;
            }
        }
        
        .panel {
            background: white;
            border-radius: 15px;
            padding: 25px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.05);
        }
        
        .panel h2 {
            color: #333;
            margin-bottom: 20px;
            font-size: 1.5rem;
            border-bottom: 2px solid #f0f0f0;
            padding-bottom: 10px;
        }
        
        .panel h2 i {
            color: #667eea;
            margin-right: 10px;
        }
        
        /* Upload Area */
        .upload-area {
            border: 3px dashed #cbd5e0;
            border-radius: 15px;
            padding: 40px 20px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s;
            background: #fafbfc;
        }
        
        .upload-area:hover {
            border-color: #667eea;
            background: #f5f7ff;
        }
        
        .upload-area i {
            font-size: 4rem;
            color: #667eea;
            margin-bottom: 15px;
        }
        
        .upload-area h3 {
            font-size: 1.3rem;
            color: #333;
            margin-bottom: 10px;
        }
        
        .upload-area p {
            color: #666;
        }
        
        .file-info {
            background: #f8f9fa;
            border-radius: 10px;
            padding: 15px;
            margin-top: 20px;
            border-left: 4px solid #667eea;
        }
        
        .file-info-item {
            display: flex;
            justify-content: space-between;
            margin-bottom: 8px;
            font-size: 0.95rem;
        }
        
        .file-info-item span:first-child {
            color: #666;
            font-weight: 500;
        }
        
        .file-info-item span:last-child {
            color: #333;
            font-weight: 600;
        }
        
        /* Controls */
        .control-group {
            margin-bottom: 20px;
        }
        
        .control-group label {
            display: block;
            margin-bottom: 8px;
            color: #555;
            font-weight: 500;
        }
        
        .control-group label i {
            color: #667eea;
            margin-right: 5px;
        }
        
        input[type="text"], select {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #e2e8f0;
            border-radius: 10px;
            font-size: 1rem;
            transition: all 0.3s;
        }
        
        input[type="text"]:focus, select:focus {
            outline: none;
            border-color: #667eea;
        }
        
        .slider-container {
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        input[type="range"] {
            flex: 1;
            height: 6px;
            background: #e2e8f0;
            border-radius: 3px;
        }
        
        input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            width: 20px;
            height: 20px;
            background: #667eea;
            border-radius: 50%;
            cursor: pointer;
            transition: all 0.2s;
        }
        
        .slider-value {
            min-width: 60px;
            text-align: center;
            background: #f0f4ff;
            padding: 5px 10px;
            border-radius: 20px;
            color: #667eea;
            font-weight: 600;
        }
        
        .color-group {
            display: flex;
            gap: 10px;
        }
        
        input[type="color"] {
            width: 60px;
            height: 45px;
            border: 2px solid #e2e8f0;
            border-radius: 10px;
            cursor: pointer;
        }
        
        .checkbox-group {
            display: flex;
            align-items: center;
            gap: 10px;
            background: #f8f9fa;
            padding: 12px 15px;
            border-radius: 10px;
        }
        
        .checkbox-group input[type="checkbox"] {
            width: 20px;
            height: 20px;
            accent-color: #667eea;
        }
        
        .timestamp-display {
            background: #f0f4ff;
            padding: 12px;
            border-radius: 10px;
            text-align: center;
            margin: 15px 0;
            font-family: monospace;
            font-size: 1.1rem;
            color: #667eea;
            border: 1px dashed #667eea;
        }
        
        /* Preview */
        .preview-container {
            background: #f8f9fa;
            border-radius: 15px;
            padding: 20px;
            min-height: 400px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            position: relative;
            border: 2px solid #e2e8f0;
        }
        
        #previewCanvas {
            max-width: 100%;
            max-height: 350px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }
        
        .preview-placeholder {
            text-align: center;
            color: #999;
        }
        
        .preview-placeholder i {
            font-size: 4rem;
            margin-bottom: 15px;
            color: #cbd5e0;
        }
        
        .page-info {
            margin-top: 10px;
            color: #667eea;
            font-weight: 500;
        }
        
        /* Buttons */
        .action-buttons {
            display: flex;
            gap: 15px;
            margin-top: 25px;
        }
        
        .btn {
            flex: 1;
            padding: 15px;
            border: none;
            border-radius: 10px;
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            transition: all 0.3s;
        }
        
        .btn-primary {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
        }
        
        .btn-primary:hover:not(:disabled) {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
        }
        
        .btn-success {
            background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
            color: white;
        }
        
        .btn-success:hover:not(:disabled) {
            transform: translateY(-2px);
            box-shadow: 0 10px 20px rgba(72, 187, 120, 0.3);
        }
        
        .btn:disabled {
            opacity: 0.5;
            cursor: not-allowed;
        }
        
        .progress-container {
            margin-top: 20px;
            display: none;
        }
        
        .progress-bar {
            height: 10px;
            background: #e2e8f0;
            border-radius: 5px;
            overflow: hidden;
        }
        
        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, #667eea, #764ba2);
            width: 0%;
            transition: width 0.3s;
        }
        
        .status {
            margin-top: 15px;
            padding: 12px;
            border-radius: 10px;
            text-align: center;
            font-weight: 500;
            display: none;
        }
        
        .status.success {
            background: #c6f6d5;
            color: #22543d;
            display: block;
        }
        
        .status.error {
            background: #fed7d7;
            color: #742a2a;
            display: block;
        }
        
        .status.processing {
            background: #bee3f8;
            color: #2c5282;
            display: block;
        }
        
        footer {
            background: white;
            border-radius: 0 0 20px 20px;
            padding: 20px;
            text-align: center;
            color: #666;
            box-shadow: 0 -5px 20px rgba(0,0,0,0.05);
        }