:root {
            --primary: #25D366;
            --primary-dark: #128C7E;
            --primary-darker: #075E54;
            --primary-light: #DCF8C6;
            --white: #ffffff;
            --gray-100: #f8f9fa;
            --gray-200: #e9ecef;
            --gray-300: #dee2e6;
            --gray-400: #ced4da;
            --gray-500: #adb5bd;
            --gray-600: #6c757d;
            --gray-700: #495057;
            --gray-800: #343a40;
            --gray-900: #212529;
            --gold: #FFD700;
            --error: #dc3545;
            --success: #28a745;
            --warning: #ffc107;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
            --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
            --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
            --shadow-xl: 0 20px 50px rgba(0,0,0,0.2);
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
        }

        body {
            background-color: var(--gray-100);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            color: var(--gray-800);
            line-height: 1.6;
        }

        /* Premium Header */
        .top-bar {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary-darker));
            color: var(--white);
            padding: 1rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: var(--shadow-md);
            position: relative;
            z-index: 100;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .logo-icon {
            font-size: 1.75rem;
            color: var(--white);
            transition: var(--transition);
        }

        .logo-text {
            font-size: 1.25rem;
            font-weight: 600;
            letter-spacing: 0.5px;
        }

        .premium-badge {
            background: linear-gradient(135deg, var(--gold), #daa520);
            color: var(--gray-900);
            padding: 0.35rem 0.75rem;
            border-radius: 2rem;
            font-size: 0.75rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            box-shadow: 0 0 15px rgba(255, 215, 0, 0.4);
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        /* Main Content */
        .main-content {
            flex: 1;
            display: flex;
            flex-direction: column;
            max-width: 1200px;
            width: 100%;
            margin: 2rem auto;
            padding: 0 1.5rem;
        }

        /* Tool Container */
        .tool-container {
            width: 100%;
            background: var(--white);
            border-radius: 1rem;
            box-shadow: var(--shadow-lg);
            overflow: hidden;
            margin-bottom: 2rem;
            transition: var(--transition);
        }

        .tool-container:hover {
            box-shadow: var(--shadow-xl);
            transform: translateY(-2px);
        }

        /* Tool Header */
        .tool-header {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary-darker));
            color: var(--white);
            padding: 2rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .tool-header::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
            transform: rotate(30deg);
            transition: var(--transition);
            opacity: 0;
        }

        .tool-header:hover::before {
            left: 100%;
            opacity: 1;
        }

        .whatsapp-icon {
            font-size: 3rem;
            margin-bottom: 1rem;
            color: var(--white);
            animation: pulse 2s infinite;
        }

        .tool-header h2 {
            font-size: 1.75rem;
            margin-bottom: 0.5rem;
            font-weight: 600;
        }

        .tool-header p {
            font-size: 0.9rem;
            opacity: 0.9;
            max-width: 600px;
            margin: 0 auto;
        }

        /* Form Container */
        .form-container {
            padding: 2rem;
        }

        /* Input Group */
        .input-group {
            margin-bottom: 1.5rem;
            position: relative;
        }

        .input-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--primary-darker);
            font-size: 0.95rem;
        }

        .input-field-container {
            position: relative;
        }

        .input-field {
            width: 100%;
            padding: 0.875rem 1rem;
            border: 2px solid var(--gray-300);
            border-radius: 0.5rem;
            font-size: 1rem;
            transition: var(--transition);
            padding-right: 2.5rem;
            background: var(--white);
            color: var(--gray-800);
        }

        .input-field:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(37, 211, 102, 0.2);
        }

        .clear-input {
            position: absolute;
            right: 0.75rem;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: var(--gray-500);
            cursor: pointer;
            opacity: 0;
            transition: var(--transition);
            width: 1.5rem;
            height: 1.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background-color: rgba(0,0,0,0.05);
        }

        .clear-input:hover {
            background-color: rgba(0,0,0,0.1);
            color: var(--error);
        }

        .input-field:not(:placeholder-shown) + .clear-input {
            opacity: 1;
        }

        /* Formatting Toolbar */
        .formatting-toolbar {
            display: flex;
            gap: 0.5rem;
            margin-bottom: 0.5rem;
            flex-wrap: wrap;
        }

        .format-btn {
            background: var(--gray-200);
            border: none;
            padding: 0.5rem 0.75rem;
            border-radius: 0.25rem;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--gray-700);
        }

        .format-btn:hover {
            background: var(--gray-300);
            transform: translateY(-2px);
            color: var(--gray-900);
        }

        .format-btn.active {
            background: var(--primary);
            color: var(--white);
            box-shadow: var(--shadow-sm);
        }

        /* Message Input */
        .message-input {
            min-height: 150px;
            padding: 1rem;
            border: 2px solid var(--gray-300);
            border-radius: 0.5rem;
            font-size: 1rem;
            transition: var(--transition);
            width: 100%;
            outline: none;
            background: var(--white);
            color: var(--gray-800);
        }

        .message-input:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(37, 211, 102, 0.2);
        }

        /* Button Container */
        .btn-container {
            display: flex;
            gap: 0.75rem;
            margin-top: 1rem;
        }

        /* Buttons */
        .btn {
            background: var(--primary);
            color: var(--white);
            border: none;
            padding: 0.875rem 1.25rem;
            border-radius: 0.5rem;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            position: relative;
            overflow: hidden;
            flex: 1;
            box-shadow: var(--shadow-sm);
        }

        .btn:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .btn:active {
            transform: translateY(0);
        }

        .btn::after {
            content: "";
            position: absolute;
            top: -50%;
            left: -60%;
            width: 200%;
            height: 200%;
            background: rgba(255, 255, 255, 0.1);
            transform: rotate(30deg);
            transition: var(--transition);
        }

        .btn:hover::after {
            left: 100%;
        }

        .btn.secondary {
            background: var(--error);
            color: var(--white);
            flex: 0.5;
        }

        .btn.secondary:hover {
            background: #c82333;
        }

        .btn:disabled {
            background: var(--gray-400);
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }

        .btn:disabled::after {
            display: none;
        }

        /* Number Info */
        .number-info {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            margin-top: 0.75rem;
            padding: 0.75rem;
            background: var(--primary-light);
            border-radius: 0.5rem;
            font-size: 0.875rem;
        }

        .number-info i {
            color: var(--primary-dark);
            flex-shrink: 0;
        }

        /* Modal */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            z-index: 1000;
            justify-content: center;
            align-items: center;
            backdrop-filter: blur(5px);
            animation: fadeIn 0.3s ease-out;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        .modal-content {
            background-color: var(--white);
            border-radius: 1rem;
            width: 90%;
            max-width: 600px;
            max-height: 90vh;
            overflow-y: auto;
            animation: modalSlideIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            box-shadow: var(--shadow-xl);
            transform-origin: center;
            transition: var(--transition);
        }

        @keyframes modalSlideIn {
            from {
                opacity: 0;
                transform: translateY(20px) scale(0.95);
            }
            to {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }

        .modal-header {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary-darker));
            color: var(--white);
            padding: 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            position: sticky;
            top: 0;
            z-index: 10;
            border-radius: 1rem 1rem 0 0;
        }

        .modal-header h3 {
            font-size: 1.25rem;
            font-weight: 600;
        }

        .close-modal {
            background: none;
            border: none;
            color: var(--white);
            font-size: 1.5rem;
            cursor: pointer;
            transition: var(--transition);
            width: 2.25rem;
            height: 2.25rem;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
        }

        .close-modal:hover {
            transform: rotate(90deg);
            background: rgba(255,255,255,0.1);
        }

        .modal-body {
            padding: 1.5rem;
        }

        /* Display Elements */
        #display-number {
            font-size: 1.125rem;
            letter-spacing: 0.5px;
            color: var(--primary-darker);
            display: inline-block;
            padding: 0.5rem 1rem;
            background: rgba(18, 140, 126, 0.1);
            border-radius: 0.375rem;
            margin: 0.5rem 0;
            font-weight: 600;
        }

        #display-message {
            font-family: inherit;
            font-size: 0.9375rem;
            line-height: 1.6;
            color: var(--gray-800);
            text-align: left;
            white-space: pre-wrap;
            word-wrap: break-word;
            padding: 1rem;
            background: var(--gray-100);
            border-radius: 0.5rem;
            border-left: 4px solid var(--primary);
            max-height: 200px;
            overflow-y: auto;
            box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
        }

        #display-message b,
        #display-message strong {
            font-weight: 700;
            color: var(--primary-darker);
        }

        /* Scrollbar */
        #display-message::-webkit-scrollbar {
            width: 6px;
        }

        #display-message::-webkit-scrollbar-track {
            background: var(--gray-200);
            border-radius: 10px;
        }

        #display-message::-webkit-scrollbar-thumb {
            background: var(--primary);
            border-radius: 10px;
        }

        /* Animations */
        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }

        @keyframes qrAppear {
            0% { opacity: 0; transform: scale(0.8); }
            100% { opacity: 1; transform: scale(1); }
        }

        /* Modal Footer */
        .modal-footer {
            padding: 1rem;
            display: flex;
            justify-content: center;
            border-top: 1px solid var(--gray-200);
            gap: 0.75rem;
            position: sticky;
            bottom: 0;
            background: white;
            border-radius: 0 0 1rem 1rem;
        }

        /* Modal Buttons */
        .modal-btn {
            background: var(--primary);
            color: var(--white);
            border: none;
            padding: 0.75rem 1.25rem;
            border-radius: 0.5rem;
            cursor: pointer;
            transition: var(--transition);
            font-weight: 600;
            flex: 1;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }

        .modal-btn:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .modal-btn:active {
            transform: translateY(0);
        }

        .modal-btn::after {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, transparent 70%);
            transform: scale(0);
            transition: transform 0.5s, opacity 0.5s;
            opacity: 0;
        }

        .modal-btn:active::after {
            transform: scale(2);
            opacity: 1;
        }

        .modal-btn.secondary {
            background: var(--gray-200);
            color: var(--gray-700);
        }

        .modal-btn.secondary:hover {
            background: var(--gray-300);
        }

        /* Footer */
        .footer {
            text-align: center;
            padding: 1.5rem;
            font-size: 0.8125rem;
            color: var(--gray-600);
            background-color: var(--white);
            border-top: 1px solid var(--gray-200);
            position: relative;
        }

        .credit {
            position: absolute;
            right: 1.5rem;
            bottom: 1.5rem;
            font-size: 0.6875rem;
            color: var(--gray-500);
            opacity: 0.7;
        }

        /* Ripple effect */
        .ripple {
            position: absolute;
            border-radius: 50%;
            background-color: rgba(255, 255, 255, 0.4);
            transform: scale(0);
            animation: ripple 0.6s linear;
            pointer-events: none;
        }

        @keyframes ripple {
            to {
                transform: scale(4);
                opacity: 0;
            }
        }

        /* Tabs */
        .tabs {
            display: flex;
            margin-bottom: 1.5rem;
            border-bottom: 1px solid var(--gray-300);
            overflow-x: auto;
            scrollbar-width: none;
        }

        .tabs::-webkit-scrollbar {
            display: none;
        }

        .tab {
            padding: 0.75rem 1.25rem;
            cursor: pointer;
            background: var(--gray-200);
            border: 1px solid var(--gray-300);
            border-bottom: none;
            border-radius: 0.5rem 0.5rem 0 0;
            margin-right: 0.5rem;
            transition: var(--transition);
            font-weight: 500;
            color: var(--gray-700);
            white-space: nowrap;
            flex-shrink: 0;
        }

        .tab:hover {
            background: var(--gray-300);
        }

        .tab.active {
            background: var(--white);
            border-bottom: 1px solid var(--white);
            margin-bottom: -1px;
            font-weight: 600;
            color: var(--primary-darker);
            box-shadow: 0 2px 0 var(--primary);
        }

        .tab-content {
            display: none;
            animation: fadeIn 0.3s ease;
        }

        .tab-content.active {
            display: block;
        }

        /* QR Code Generator */
        .qr-generator-container {
            text-align: center;
            padding: 1rem;
        }

        .qr-preview-container {
            margin: 1.5rem auto;
            padding: 1.5rem;
            background: var(--white);
            border-radius: 1rem;
            box-shadow: var(--shadow-md);
            max-width: 320px;
            position: relative;
            transition: var(--transition);
            border: 1px solid var(--gray-200);
        }

        .qr-preview-container:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }

        #qr-code {
            margin: 0 auto;
            position: relative;
        }

        .watermark {
            position: absolute;
            bottom: 0.75rem;
            right: 0.75rem;
            font-size: 0.625rem;
            color: rgba(0,0,0,0.3);
            font-style: italic;
            pointer-events: none;
        }

        .qr-actions {
            margin-top: 1.5rem;
            display: flex;
            gap: 0.75rem;
            justify-content: center;
            flex-wrap: wrap;
        }

        .qr-action-btn {
            padding: 0.75rem 1.25rem;
            border-radius: 0.5rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 500;
            box-shadow: var(--shadow-sm);
            flex: 1;
            min-width: 120px;
            justify-content: center;
        }

        .qr-action-btn.primary {
            background: var(--primary);
            color: var(--white);
        }

        .qr-action-btn.secondary {
            background: var(--gray-200);
            color: var(--gray-700);
        }

        .qr-action-btn:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .qr-action-btn:active {
            transform: translateY(0);
        }

        .qr-customization {
            margin-top: 1.5rem;
            padding: 1.5rem;
            background: var(--gray-100);
            border-radius: 0.75rem;
            box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
        }

        .customization-group {
            margin-bottom: 1.25rem;
        }

        .customization-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 600;
            color: var(--primary-darker);
            font-size: 0.9375rem;
        }

        .customization-input {
            width: 100%;
            padding: 0.75rem;
            border: 1px solid var(--gray-300);
            border-radius: 0.5rem;
            font-size: 0.9375rem;
            transition: var(--transition);
            background: var(--white);
        }

        .customization-input:focus {
            border-color: var(--primary);
            outline: none;
            box-shadow: 0 0 0 3px rgba(37, 211, 102, 0.2);
        }

        .color-options {
            display: flex;
            gap: 0.75rem;
            margin-top: 0.5rem;
            flex-wrap: wrap;
        }

        .color-option {
            width: 2.25rem;
            height: 2.25rem;
            border-radius: 50%;
            cursor: pointer;
            border: 3px solid transparent;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }

        .color-option:hover {
            transform: scale(1.1);
        }

        .color-option.selected {
            border-color: var(--white);
            box-shadow: 0 0 0 3px var(--primary-darker), var(--shadow-md);
            transform: scale(1.1);
        }

        .size-options {
            display: flex;
            gap: 0.75rem;
            margin-top: 0.5rem;
            flex-wrap: wrap;
        }

        .size-option {
            padding: 0.5rem 1rem;
            border: 2px solid var(--gray-300);
            border-radius: 0.5rem;
            cursor: pointer;
            transition: var(--transition);
            font-weight: 500;
            background: var(--white);
            flex: 1;
            min-width: 80px;
            text-align: center;
        }

        .size-option:hover {
            border-color: var(--primary);
            color: var(--primary);
        }

        .size-option.selected {
            background: var(--primary);
            color: var(--white);
            border-color: var(--primary);
            box-shadow: 0 3px 10px rgba(37, 211, 102, 0.3);
        }

        .frame-options {
            display: flex;
            gap: 0.75rem;
            margin-top: 0.5rem;
            flex-wrap: wrap;
        }

        .frame-option {
            padding: 0.5rem 1rem;
            border: 2px solid var(--gray-300);
            border-radius: 0.5rem;
            cursor: pointer;
            transition: var(--transition);
            font-weight: 500;
            background: var(--white);
            flex: 1;
            min-width: 80px;
            text-align: center;
        }

        .frame-option:hover {
            border-color: var(--primary);
            color: var(--primary);
        }

        .frame-option.selected {
            background: var(--primary);
            color: var(--white);
            border-color: var(--primary);
            box-shadow: 0 3px 10px rgba(37, 211, 102, 0.3);
        }

        .logo-upload {
            margin: 1rem 0;
            text-align: center;
        }

        .logo-preview {
            width: 100px;
            height: 100px;
            border-radius: 50%;
            object-fit: cover;
            margin: 0.75rem auto;
            display: none;
            border: 3px solid var(--primary);
            box-shadow: var(--shadow-md);
            transition: var(--transition);
        }

        .logo-preview:hover {
            transform: scale(1.05);
            box-shadow: var(--shadow-lg);
        }

        .edit-qr-btn {
            position: absolute;
            top: 1rem;
            left: 1rem;
            background: rgba(0,0,0,0.7);
            color: var(--white);
            border: none;
            padding: 0.5rem 1rem;
            border-radius: 2rem;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.8125rem;
            z-index: 2;
        }

        .edit-qr-btn:hover {
            background: rgba(0,0,0,0.9);
            transform: translateY(-2px);
        }

        /* Link Generator */
        .link-generator-container {
            text-align: center;
            padding: 1rem;
        }

        .link-preview {
            width: 100%;
            padding: 0.875rem;
            border: 1px solid var(--gray-300);
            border-radius: 0.5rem;
            font-size: 1rem;
            margin: 1.5rem 0;
            background: var(--gray-100);
            box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
            transition: var(--transition);
        }

        .link-preview:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(37, 211, 102, 0.2), inset 0 1px 3px rgba(0,0,0,0.1);
        }

        .link-actions {
            display: flex;
            gap: 0.75rem;
            justify-content: center;
            margin-top: 1.5rem;
            flex-wrap: wrap;
        }

        .link-action-btn {
            padding: 0.75rem 1.25rem;
            border-radius: 0.5rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-weight: 500;
            box-shadow: var(--shadow-sm);
            flex: 1;
            min-width: 150px;
            justify-content: center;
        }

        .link-action-btn.primary {
            background: var(--primary);
            color: var(--white);
        }

        .link-action-btn.secondary {
            background: var(--gray-200);
            color: var(--gray-700);
        }

        .link-action-btn:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        .link-action-btn:active {
            transform: translateY(0);
        }

        /* QR Code Animation */
        .qr-appear {
            animation: qrAppear 0.5s ease-out;
        }

        /* Tooltip */
        .tooltip {
            position: relative;
            display: inline-block;
        }

        .tooltip .tooltiptext {
            visibility: hidden;
            width: 120px;
            background-color: var(--gray-800);
            color: var(--white);
            text-align: center;
            border-radius: 0.375rem;
            padding: 0.5rem;
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            margin-left: -60px;
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 0.75rem;
        }

        .tooltip .tooltiptext::after {
            content: "";
            position: absolute;
            top: 100%;
            left: 50%;
            margin-left: -5px;
            border-width: 5px;
            border-style: solid;
            border-color: var(--gray-800) transparent transparent transparent;
        }

        .tooltip:hover .tooltiptext {
            visibility: visible;
            opacity: 1;
        }

        /* Alert */
        .alert {
            padding: 0.75rem 1.25rem;
            margin-bottom: 1rem;
            border: 1px solid transparent;
            border-radius: 0.5rem;
            font-size: 0.875rem;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .alert-danger {
            color: #721c24;
            background-color: #f8d7da;
            border-color: #f5c6cb;
        }

        .alert-success {
            color: #155724;
            background-color: #d4edda;
            border-color: #c3e6cb;
        }

        .alert-warning {
            color: #856404;
            background-color: #fff3cd;
            border-color: #ffeeba;
        }

        /* Responsive adjustments */
        @media (max-width: 768px) {
            .main-content {
                padding: 0 1rem;
                margin: 1rem auto;
            }
            
            .form-container {
                padding: 1.5rem;
            }
            
            .tool-header h2 {
                font-size: 1.5rem;
            }

            .modal-content {
                max-width: 95%;
            }

            .qr-actions, .link-actions {
                flex-direction: column;
            }

            .qr-action-btn, .link-action-btn {
                width: 100%;
            }

            .tabs {
                flex-wrap: nowrap;
                overflow-x: auto;
                padding-bottom: 0.5rem;
            }

            .tab {
                font-size: 0.875rem;
                padding: 0.5rem 1rem;
            }
        }

        @media (max-width: 576px) {
            .top-bar {
                flex-direction: column;
                gap: 0.75rem;
                padding: 1rem;
            }
            
            .logo-text {
                font-size: 1.125rem;
            }
            
            .modal-footer {
                flex-direction: column;
            }
            
            .modal-btn, .btn {
                width: 100%;
            }
            
            .btn-container {
                flex-direction: column;
            }
            
            .credit {
                position: static;
                margin-top: 0.75rem;
            }

            .qr-preview-container {
                padding: 1rem;
            }

            .qr-customization {
                padding: 1rem;
            }

            .size-option, .frame-option {
                min-width: 60px;
                font-size: 0.875rem;
                padding: 0.5rem;
            }
        }