* {
            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;
            color: #333;
        }

        .container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 20px;
        }

        .header {
            text-align: center;
            margin-bottom: 30px;
            color: white;
        }

        .header h1 {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 10px;
            text-shadow: 0 2px 4px rgba(0,0,0,0.3);
        }

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

        .qr-types-nav {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 15px;
            padding: 20px;
            margin-bottom: 30px;
            box-shadow: 0 8px 32px rgba(0,0,0,0.1);
        }

        .nav-title {
            font-size: 1.2rem;
            font-weight: 600;
            color: #4c63d2;
            margin-bottom: 15px;
            text-align: center;
        }

        .qr-types-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
            gap: 12px;
        }

        .qr-type-btn {
            background: linear-gradient(135deg, #4c63d2 0%, #6366f1 100%);
            color: white;
            border: none;
            padding: 12px 16px;
            border-radius: 10px;
            cursor: pointer;
            font-size: 0.9rem;
            font-weight: 500;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            text-align: center;
        }

        .qr-type-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(76, 99, 210, 0.4);
        }

        .qr-type-btn.active {
            background: linear-gradient(135deg, #1e40af 0%, #3730a3 100%);
            box-shadow: 0 8px 25px rgba(30, 64, 175, 0.4);
        }

        .qr-type-btn.active,
        .qr-type-btn.active .icon,
        .qr-type-btn.active span {
            color: white !important;
        }

        .qr-type-btn .icon {
            font-size: 1.1rem;
        }

        .main-content {
            display: grid;
            grid-template-columns: 1fr 400px;
            gap: 30px;
            align-items: start;
        }

        .form-panel {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 15px;
            padding: 30px;
            box-shadow: 0 8px 32px rgba(0,0,0,0.1);
        }

        .preview-panel {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-radius: 15px;
            padding: 30px;
            box-shadow: 0 8px 32px rgba(0,0,0,0.1);
            text-align: center;
            position: sticky;
            top: 20px;
        }

        .form-section {
            margin-bottom: 25px;
        }

        .form-section h3 {
            color: #4c63d2;
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .form-group {
            margin-bottom: 15px;
        }

        .form-group label {
            display: block;
            margin-bottom: 5px;
            font-weight: 500;
            color: #374151;
        }

        .form-control {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #e5e7eb;
            border-radius: 8px;
            font-size: 1rem;
            transition: all 0.3s ease;
            background: white;
        }

        .form-control:focus {
            outline: none;
            border-color: #4c63d2;
            box-shadow: 0 0 0 3px rgba(76, 99, 210, 0.1);
        }

        textarea.form-control {
            resize: vertical;
            min-height: 100px;
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }

        .color-input {
            width: 60px;
            height: 40px;
            border: none;
            border-radius: 6px;
            cursor: pointer;
        }

        .range-input {
            width: 100%;
            margin: 10px 0;
        }

        .range-value {
            display: inline-block;
            background: #4c63d2;
            color: white;
            padding: 4px 8px;
            border-radius: 4px;
            font-size: 0.9rem;
            margin-left: 10px;
        }

        .qr-preview {
            background: white;
            border-radius: 12px;
            padding: 20px;
            margin-bottom: 20px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }

        #qrcode {
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 200px;
        }

        .preview-info {
            background: #f8fafc;
            border-radius: 8px;
            padding: 15px;
            margin-bottom: 20px;
            font-size: 0.9rem;
            color: #64748b;
        }

        .action-buttons {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 10px;
        }

        .btn {
            padding: 12px 20px;
            border: none;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        .btn-primary {
            background: linear-gradient(135deg, #4c63d2 0%, #6366f1 100%);
            color: white;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(76, 99, 210, 0.4);
        }

        .btn-secondary {
            background: linear-gradient(135deg, #64748b 0%, #475569 100%);
            color: white;
        }

        .btn-secondary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(100, 116, 139, 0.4);
        }

        @media (max-width: 1024px) {
            .main-content {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            
            .preview-panel {
                position: static;
            }
        }

        @media (max-width: 768px) {
            .qr-types-grid {
                grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
                gap: 8px;
            }
            
            .qr-type-btn {
                padding: 10px 12px;
                font-size: 0.8rem;
            }
            
            .form-row {
                grid-template-columns: 1fr;
            }
            
            .action-buttons {
                grid-template-columns: 1fr;
            }
        }

        .success-message {
            background: #10b981;
            color: white;
            padding: 10px 15px;
            border-radius: 6px;
            margin-top: 10px;
            display: none;
        }