:root {
            --primary-color: #4361ee;
            --primary-hover: #3a56d4;
            --success-color: #2ecc71;
            --warning-color: #f39c12;
            --danger-color: #e74c3c;
            --light-color: #f8f9fa;
            --dark-color: #2b2d42;
            --white: #ffffff;
            --gray: #e9ecef;
            --dark-gray: #6c757d;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background-color: var(--light-color);
            color: var(--dark-color);
            line-height: 1.6;
            min-height: 100vh;
        }
        
        .container {
            max-width: 900px;
            margin: 20px auto;
            background-color: var(--white);
            border-radius: 12px;
            box-shadow: var(--shadow);
            padding: 30px;
            position: relative;
            overflow: hidden;
        }
        
        .container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 8px;
            background: linear-gradient(90deg, var(--primary-color), var(--success-color));
        }
        
        h1 {
            margin-bottom: 25px;
            color: var(--dark-color);
            text-align: center;
            font-weight: 600;
            font-size: 2rem;
            position: relative;
            padding-bottom: 15px;
        }
        
        h1::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-color), var(--success-color));
            border-radius: 2px;
        }
        
        .qr-container {
            display: flex;
            flex-wrap: wrap;
            gap: 30px;
            margin-bottom: 30px;
        }
        
        .qr-preview {
            flex: 1;
            min-width: 300px;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        
        .qr-preview.full-width {
            max-width: 100%;
        }
        
        .qr-image-container {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 20px;
            width: 100%;
        }
        
        .side-image {
            width: 300px;
            height: 300px;
            object-fit: contain;

        }
        
        #qrcode {
            margin: 20px auto;
            padding: 20px;
            background-color: var(--white);
            border-radius: 12px;
            box-shadow: var(--shadow);
            position: relative;
            min-height: 220px;
            min-width: 220px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid var(--gray);
            transition: var(--transition);
        }
        
        #qrcode:hover {
            box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
            transform: translateY(-2px);
        }
        
        #qrcode img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
        }
        
        .qr-logo {
            position: absolute;
            width: 20%;
            height: 20%;
            background-color: var(--white);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        }
        
        .qr-logo img {
            width: 80%;
            height: 80%;
            object-fit: contain;
        }
        
        .qr-controls {
            flex: 1;
            min-width: 300px;
            background-color: var(--white);
            padding: 25px;
            border-radius: 12px;
            box-shadow: var(--shadow);
            border: 1px solid var(--gray);
        }
        
        .control-group {
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 1px solid var(--gray);
        }
        
        .control-group:last-child {
            border-bottom: none;
            margin-bottom: 0;
            padding-bottom: 0;
        }
        
        .control-group h3 {
            margin-bottom: 15px;
            font-size: 1.1rem;
            color: var(--dark-color);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .control-group h3 i {
            color: var(--primary-color);
        }
        
        .slider-container {
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .slider {
            flex: 1;
            -webkit-appearance: none;
            height: 8px;
            border-radius: 4px;
            background: var(--gray);
            outline: none;
            transition: var(--transition);
        }
        
        .slider:hover {
            background: #ced4da;
        }
        
        .slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--primary-color);
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
        }
        
        .slider::-webkit-slider-thumb:hover {
            transform: scale(1.1);
        }
        
        .slider::-moz-range-thumb {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--primary-color);
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
        }
        
        .slider::-moz-range-thumb:hover {
            transform: scale(1.1);
        }
        
        .color-picker {
            display: flex;
            align-items: center;
            gap: 15px;
            flex-wrap: wrap;
        }
        
        .color-picker label {
            font-size: 0.9rem;
            color: var(--dark-gray);
            min-width: 60px;
        }
        
        .color-input {
            width: 60px;
            height: 35px;
            padding: 0;
            border: 1px solid var(--gray);
            border-radius: 8px;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: var(--shadow);
        }
        
        .color-input:hover {
            transform: scale(1.05);
        }
        
        .file-input {
            display: none;
        }
        
        .file-label {
            display: inline-flex;
            align-items: center;
            padding: 10px 20px;
            background-color: var(--primary-color);
            color: var(--white);
            border-radius: 8px;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: var(--shadow);
            font-size: 0.9rem;
        }
        
        .file-label:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
        }
        
        .file-name {
            margin-left: 10px;
            font-size: 0.9rem;
            color: var(--dark-gray);
            max-width: 150px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        
        .content-box {
            margin-top: 20px;
            padding: 25px;
            border: 1px solid var(--gray);
            border-radius: 12px;
            background-color: var(--white);
            word-break: break-all;
            transition: var(--transition);
            box-shadow: var(--shadow);
        }
        
        .content-box.full-width {
            max-width: 600px;
            width: 100%;
        }
        
        .content-box h3 {
            margin-bottom: 15px;
            color: var(--dark-color);
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .content-box h3 i {
            color: var(--primary-color);
        }
        
        #contentText {
            white-space: pre-wrap;
            font-size: 14px;
            line-height: 1.6;
            width: 100%;
            min-height: 120px;
            padding: 12px;
            border: 1px solid var(--gray);
            border-radius: 8px;
            resize: vertical;
            transition: var(--transition);
        }
        
        #contentText:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
        }
        
        #contentText:disabled {
            background-color: #f8f9fa;
            cursor: not-allowed;
            opacity: 0.8;
        }
        
        .action-buttons {
            display: flex;
            gap: 15px;
            margin-top: 30px;
            flex-wrap: wrap;
            justify-content: center;
        }
        
        .btn {
            padding: 12px 24px;
            border-radius: 8px;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 500;
            transition: var(--transition);
            border: none;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            box-shadow: var(--shadow);
        }
        
        .btn-primary {
            background-color: var(--primary-color);
            color: var(--white);
        }
        
        .btn-primary:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
        }
        
        .btn-success {
            background-color: var(--success-color);
            color: var(--white);
        }
        
        .btn-success:hover {
            background-color: #27b06a;
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
        }
        
        .btn i {
            font-size: 1.1rem;
        }
        
        .loading {
            text-align: center;
            margin: 20px 0;
            display: none;
        }
        
        .loading-spinner {
            border: 4px solid var(--gray);
            border-top: 4px solid var(--primary-color);
            border-radius: 50%;
            width: 40px;
            height: 40px;
            animation: spin 1s linear infinite;
            margin: 0 auto;
        }
        
        .error-message {
            color: var(--danger-color);
            margin-top: 10px;
            font-size: 0.9rem;
            text-align: center;
            padding: 10px;
            background-color: rgba(231, 76, 60, 0.1);
            border-radius: 8px;
        }
        
        .format-options {
            display: flex;
            gap: 10px;
            margin-top: 15px;
        }
        
        .format-option {
            padding: 8px 16px;
            border: 1px solid var(--gray);
            border-radius: 8px;
            cursor: pointer;
            transition: var(--transition);
            font-size: 0.9rem;
        }
        
        .format-option:hover {
            border-color: var(--primary-color);
            color: var(--primary-color);
        }
        
        .format-option.active {
            background-color: var(--primary-color);
            color: var(--white);
            border-color: var(--primary-color);
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        @media (max-width: 768px) {
            .container {
                padding: 20px;
            }
            
            .qr-container {
                flex-direction: column;
            }
            
            .action-buttons {
                flex-direction: column;
            }
            
            .btn {
                width: 100%;
            }
            
            .color-picker {
                gap: 10px;
            }
            
            .color-picker label {
                min-width: 50px;
            }
            
            .qr-image-container {
                flex-direction: column;
            }
            
            .side-image {
                width: 100%;
                max-width: 300px;
                height: auto;
            }
        }
        
        .hidden {
            display: none !important;
        }