* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #6a11cb 0%, #2575fc 100%);
            color: #333;
            min-height: 100vh;
            padding: 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        
        .container {
            max-width: 900px;
            width: 100%;
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
            overflow: hidden;
            margin-top: 30px;
        }
        
        header {
            background: #2c3e50;
            color: white;
            padding: 25px;
            text-align: center;
        }
        
        h1 {
            font-size: 2.2rem;
            margin-bottom: 10px;
        }
        
        .subtitle {
            font-size: 1.1rem;
            opacity: 0.8;
        }
        
        .content {
            display: flex;
            flex-wrap: wrap;
            padding: 30px;
        }
        
        .input-section {
            flex: 1;
            min-width: 300px;
            padding: 20px;
        }
        
        .output-section {
            flex: 1;
            min-width: 300px;
            padding: 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #2c3e50;
        }
        
        input, textarea, select {
            width: 100%;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-size: 16px;
            transition: all 0.3s;
        }
        
        textarea {
            min-height: 120px;
            resize: vertical;
        }
        
        input:focus, textarea:focus, select:focus {
            border-color: #3498db;
            box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
            outline: none;
        }
        
        button {
            background: #3498db;
            color: white;
            border: none;
            padding: 14px 25px;
            border-radius: 8px;
            font-size: 16px;
            cursor: pointer;
            transition: all 0.3s;
            font-weight: 600;
            width: 100%;
            margin-top: 10px;
        }
        
        button:hover {
            background: #2980b9;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        }
        
        #qrcode {
            width: 250px;
            height: 250px;
            background: #f8f9fa;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            border: 1px dashed #ccc;
            overflow: hidden;
        }
        
        #qrcode img {
            max-width: 100%;
            max-height: 100%;
        }
        
        .placeholder-text {
            color: #7f8c8d;
            text-align: center;
            font-style: italic;
        }
        
        .download-btn {
            background: #27ae60;
            width: auto;
            padding: 10px 20px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-top: 15px;
        }
        
        .download-btn:hover {
            background: #219653;
        }
        
        .instructions {
            background: #f8f9fa;
            border-left: 4px solid #3498db;
            padding: 15px;
            margin-top: 30px;
            border-radius: 0 8px 8px 0;
        }
        
        .instructions h3 {
            margin-bottom: 10px;
            color: #2c3e50;
        }
        
        .instructions ul {
            padding-left: 20px;
        }
        
        .instructions li {
            margin-bottom: 8px;
            line-height: 1.5;
        }
        
        footer {
            text-align: center;
            padding: 20px;
            color: white;
            margin-top: 30px;
            font-size: 0.9rem;
            opacity: 0.8;
        }
        
        @media (max-width: 768px) {
            .content {
                flex-direction: column;
            }
            
            .input-section, .output-section {
                width: 100%;
            }
            
            h1 {
                font-size: 1.8rem;
            }
        }