* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        

        
        .container {
            width: 100%;
            max-width: 1200px;
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            padding: 30px;
            margin-top: 20px;
            margin:0 auto;margin-top:20px;
        }
        
        header {
            text-align: center;
            margin-bottom: 30px;
        }
        
        h1 {
            color: #2c3e50;
            margin-bottom: 10px;
            font-size: 2.5rem;
        }
        
        .subtitle {
            color: #7f8c8d;
            font-size: 1.1rem;
        }
        
        .main-content {
            display: flex;
            flex-wrap: wrap;
            gap: 30px;
        }
        
        .upload-section {
            flex: 1;
            min-width: 300px;
        }
        
        .preview-section {
            flex: 1;
            min-width: 300px;
        }
        
        .section-title {
            font-size: 1.3rem;
            margin-bottom: 15px;
            color: #2c3e50;
            padding-bottom: 8px;
            border-bottom: 2px solid #3498db;
        }
        
        .upload-box {
            border: 2px dashed #3498db;
            border-radius: 10px;
            padding: 30px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s;
            background-color: #f8f9fa;
        }
        
        .upload-box:hover {
            background-color: #e8f4fc;
            border-color: #2980b9;
        }
        
        .upload-icon {
            font-size: 3rem;
            color: #3498db;
            margin-bottom: 15px;
        }
        
        .upload-text {
            color: #7f8c8d;
            margin-bottom: 15px;
        }
        
        #file-input {
            display: none;
        }
        
        .btn {
            background: #3498db;
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 5px;
            cursor: pointer;
            font-size: 1rem;
            transition: background 0.3s;
        }
        
        .btn:hover {
            background: #2980b9;
        }
        
        .options-panel {
            background: #f8f9fa;
            border-radius: 10px;
            padding: 20px;
            margin-top: 20px;
        }
        
        .option-group {
            margin-bottom: 15px;
        }
        
        .option-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #2c3e50;
        }
        
        .size-options {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 10px;
        }
        
        .size-option {
            flex: 1;
            min-width: 80px;
        }
        
        .size-btn {
            width: 100%;
            padding: 10px;
            background: #ecf0f1;
            border: 2px solid #bdc3c7;
            border-radius: 5px;
            cursor: pointer;
            text-align: center;
            transition: all 0.2s;
        }
        
        .size-btn.active {
            background: #3498db;
            color: white;
            border-color: #2980b9;
        }
        
        .format-options {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        
        .format-option {
            flex: 1;
            min-width: 60px;
        }
        
        .format-btn {
            width: 100%;
            padding: 10px;
            background: #ecf0f1;
            border: 2px solid #bdc3c7;
            border-radius: 5px;
            cursor: pointer;
            text-align: center;
            transition: all 0.2s;
        }
        
        .format-btn.active {
            background: #3498db;
            color: white;
            border-color: #2980b9;
        }
        
        .custom-size {
            display: flex;
            gap: 10px;
            margin-top: 10px;
        }
        
        .custom-size input {
            flex: 1;
            padding: 10px;
            border: 2px solid #bdc3c7;
            border-radius: 5px;
        }
        
        .preview-container {
            text-align: center;
            margin-bottom: 20px;
        }
        
        #preview-image {
            max-width: 100%;
            max-height: 300px;
            border: 1px solid #ddd;
            border-radius: 5px;
            margin-bottom: 15px;
        }
        
        .preview-info {
            background: #f8f9fa;
            padding: 10px;
            border-radius: 5px;
            font-size: 0.9rem;
            color: #7f8c8d;
        }
        
        .download-btn {
            display: block;
            width: 100%;
            padding: 15px;
            background: #2ecc71;
            color: white;
            border: none;
            border-radius: 5px;
            font-size: 1.1rem;
            cursor: pointer;
            transition: background 0.3s;
            margin-top: 20px;
        }
        
        .download-btn:hover {
            background: #27ae60;
        }
        
        .download-btn:disabled {
            background: #bdc3c7;
            cursor: not-allowed;
        }
        
        footer {
            margin-top: 30px;
            text-align: center;
            color: white;
            font-size: 0.9rem;
        }
        
        @media (max-width: 768px) {
            .main-content {
                flex-direction: column;
            }
        }
        
        .quality-slider {
            margin-top: 10px;
            width: 100%;
        }
        
        .quality-value {
            text-align: center;
            font-size: 0.9rem;
            color: #7f8c8d;
        }