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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            max-width: 800px;
            margin: 0 auto;
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            overflow: hidden;
        }

        .header {
            background:#000053; /*linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);*/
            color: white;
            text-align: center;
            padding: 30px;
        }

        .header h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
        }

        .header p {
            font-size: 1.1rem;
            opacity: 0.9;
        }

        .content {
            padding: 40px;
        }

        .form-section {
            margin-bottom: 30px;
        }

        .form-section h3 {
            color: #333;
            margin-bottom: 15px;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
        }

        .form-section h3::before {
            content: '';
            width: 4px;
            height: 20px;
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            margin-right: 10px;
            border-radius: 2px;
        }

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

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

        .checkbox-label {
            display: flex;
            align-items: center;
            cursor: pointer;
        }

        input[type="url"], input[type="text"] {
            width: 100%;
            padding: 12px 16px;
            border: 2px solid #e1e5e9;
            border-radius: 10px;
            font-size: 16px;
            transition: all 0.3s ease;
        }

        input[type="url"]:focus, input[type="text"]:focus {
            outline: none;
            border-color: #4facfe;
            box-shadow: 0 0 0 3px rgba(79, 172, 254, 0.1);
        }

        input[type="checkbox"] {
            width: 18px;
            height: 18px;
            accent-color: #4facfe;
            cursor: pointer;
        }

        .color-controls {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-top: 20px;
        }

        .color-group {
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        input[type="color"] {
            width: 60px;
            height: 60px;
            border: none;
            border-radius: 50%;
            cursor: pointer;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            transition: transform 0.2s ease;
        }

        input[type="color"]:hover {
            transform: scale(1.1);
        }

        .qr-container {
            text-align: center;
            background: #f8f9fa;
            border-radius: 15px;
            padding: 30px;
            margin: 30px 0;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        #qrcode {
            display: flex;
            justify-content: center;
            align-items: center;
            margin-bottom: 20px;
        }

        #qrcode canvas {
            border-radius: 10px;
            box-shadow: 0 8px 25px rgba(0,0,0,0.15);
            display: block;
        }

        .download-btn {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            padding: 12px 30px;
            border-radius: 25px;
            font-size: 16px;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-top: 20px;
        }

        .download-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(0,0,0,0.2);
        }

        .download-btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        @media (max-width: 600px) {
            .header h1 {
                font-size: 2rem;
            }
            
            .content {
                padding: 20px;
            }
            
            .color-controls {
                grid-template-columns: 1fr;
            }
        }