:root {
            --primary: #6366f1;
            --primary-dark: #4f46e5;
            --secondary: #a855f7;
            --gradient-start: #6366f1;
            --gradient-end: #a855f7;
            --bg-color: #f8fafc;
            --card-bg: #ffffff;
            --text-primary: #1e293b;
            --text-secondary: #64748b;
            --border-color: #e2e8f0;
            --success: #10b981;
            --error: #ef4444;
            --radius: 12px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
        }

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

        header {
            text-align: center;
            padding: 3rem 1rem 2rem;
            background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
            color: white;
            position: relative;
            overflow: hidden;
        }

        header::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image:
                radial-gradient(circle at 20% 30%, rgba(255,255,255,0.1) 0%, transparent 20%),
                radial-gradient(circle at 80% 70%, rgba(255,255,255,0.1) 0%, transparent 20%);
            z-index: 0;
        }

        header h1 {
            position: relative;
            font-size: 2.5rem;
            margin-bottom: 0.5rem;
            font-weight: 800;
            z-index: 1;
        }

        header p {
            position: relative;
            font-size: 1.1rem;
            max-width: 36rem;
            margin: 0 auto;
            opacity: 0.9;
            z-index: 1;
        }

        main {
            max-width: 1200px;
            width: 100%;
            margin: 0 auto;
            padding: 2rem 1rem;
            display: flex;
            flex-direction: column;
            gap: 2rem;
            flex: 1;
        }

        .container {
            display: grid;
            grid-template-columns: 1fr;
            gap: 2rem;
        }

        @media (min-width: 768px) {
            .container {
                grid-template-columns: 3fr 2fr;
            }
        }

        .card {
            background: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
            padding: 1.5rem;
            height: fit-content;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
        }

        .card h2 {
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .form-section {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .form-group {
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }

        .form-group label {
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 0.25rem;
        }

        .tooltip {
            position: relative;
            display: inline-flex;
            color: var(--text-secondary);
            cursor: help;
        }

        .tooltip:hover::after {
            content: attr(data-tooltip);
            position: absolute;
            top: 100%;
            left: 50%;
            transform: translateX(-50%);
            background: var(--text-primary);
            color: white;
            padding: 0.5rem 0.75rem;
            border-radius: 0.25rem;
            font-size: 0.8rem;
            white-space: nowrap;
            z-index: 10;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
        }

        input, textarea {
            padding: 0.75rem 1rem;
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            font-size: 1rem;
            width: 100%;
            transition: border-color 0.2s ease, box-shadow 0.2s ease;
        }

        input:focus, textarea:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
        }

        textarea {
            min-height: 120px;
            resize: vertical;
        }

        .button {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 0.75rem 1.5rem;
            border-radius: var(--radius);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s ease;
            border: none;
        }

        .button-primary {
            background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
            color: white;
        }

        .button-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
        }

        .button-secondary {
            background-color: transparent;
            border: 1px solid var(--border-color);
            color: var(--text-primary);
        }

        .button-secondary:hover {
            background-color: var(--bg-color);
            border-color: var(--text-secondary);
        }

        .actions {
            display: flex;
            flex-wrap: wrap;
            gap: 1rem;
            margin-top: 1.5rem;
        }

        .result-section {
            margin-top: 1.5rem;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .result-box {
            background-color: var(--bg-color);
            border: 1px solid var(--border-color);
            border-radius: var(--radius);
            padding: 1rem;
            word-break: break-all;
            font-family: monospace;
            position: relative;
            opacity: 0;
            transform: translateY(10px);
            max-height: 0;
            overflow: hidden;
            transition: opacity 0.4s ease, transform 0.4s ease, max-height 0.4s ease, padding 0.4s ease;
        }

        .result-box.show {
            opacity: 1;
            transform: translateY(0);
            max-height: 200px;
            padding: 1rem;
        }

        .copy-btn {
            position: absolute;
            top: 0.5rem;
            right: 0.5rem;
            background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
            color: white;
            border: none;
            border-radius: 0.25rem;
            padding: 0.25rem 0.5rem;
            font-size: 0.8rem;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .copy-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
        }

        #qrContainer {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 1rem;
            margin-top: 1rem;
        }

        .qr-warning {
            background-color: rgba(251, 146, 60, 0.1);
            border-left: 3px solid #fb923c;
            padding: 0.75rem 1rem;
            border-radius: var(--radius);
            font-size: 0.9rem;
            margin-top: 1rem;
            color: #9a3412;
            display: block;
            animation: fadeIn 0.5s ease;
        }

        .features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 1.5rem;
            margin-top: 1rem;
        }

        .feature-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
            padding: 1.5rem;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
            transition: transform 0.3s ease;
        }

        .feature-card:hover {
            transform: translateY(-5px);
        }

        .feature-icon {
            width: 3rem;
            height: 3rem;
            background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.5rem;
            margin-bottom: 0.5rem;
        }

        .feature-card h3 {
            font-size: 1.2rem;
            margin-bottom: 0.5rem;
        }

        footer {
            background-color: var(--text-primary);
            color: white;
            padding: 2rem;
            text-align: center;
            margin-top: 3rem;
        }

        footer a {
            color: var(--primary);
            text-decoration: none;
            font-weight: 600;
            transition: color 0.2s ease;
        }

        footer a:hover {
            color: var(--secondary);
            text-decoration: underline;
        }

        .notification {
            position: fixed;
            bottom: 1rem;
            right: 1rem;
            padding: 0.75rem 1.5rem;
            background-color: var(--success);
            color: white;
            border-radius: var(--radius);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            transform: translateX(200%);
            transition: transform 0.3s ease;
            z-index: 100;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .notification.show {
            transform: translateX(0);
        }

        .help-text {
            font-size: 0.85rem;
            color: var(--text-secondary);
            margin-top: 0.25rem;
        }

        .icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 1.5rem;
            height: 1.5rem;
        }

        .loading {
            display: inline-block;
            width: 1.5rem;
            height: 1.5rem;
            border: 2px solid rgba(255, 255, 255, 0.3);
            border-radius: 50%;
            border-top-color: white;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            to {
                transform: rotate(360deg);
            }
        }

        @keyframes fadeIn {
            from {
                opacity: 0;
                transform: translateY(10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes bounce {
            0%, 100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-10px);
            }
        }

        .shake {
            animation: shake 0.5s ease-in-out;
        }

        @keyframes shake {
            0%, 100% {
                transform: translateX(0);
            }
            10%, 30%, 50%, 70%, 90% {
                transform: translateX(-5px);
            }
            20%, 40%, 60%, 80% {
                transform: translateX(5px);
            }
        }

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

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

        .tab {
            padding: 0.75rem 1.5rem;
            cursor: pointer;
            font-weight: 500;
            border-bottom: 2px solid transparent;
            transition: all 0.2s ease;
            white-space: nowrap;
        }

        .tab.active {
            border-bottom-color: var(--primary);
            color: var(--primary);
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
            animation: fadeIn 0.3s ease;
        }

        .download-btn {
            background-color: var(--primary);
            color: white;
            padding: 0.5rem 1rem;
            border-radius: var(--radius);
            font-size: 0.9rem;
            cursor: pointer;
            border: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            transition: all 0.2s ease;
            margin-top: 1rem;
        }

        .download-btn:hover {
            background-color: var(--primary-dark);
        }

        #previewLink {
            margin-top: 1rem;
            padding: 0.75rem;
            border-radius: var(--radius);
            background-color: var(--bg-color);
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            text-decoration: none;
            color: var(--primary);
            border: 1px solid var(--border-color);
            transition: all 0.2s ease;
        }

        #previewLink:hover {
            background-color: var(--primary);
            color: white;
        }

        /* Animation for the QR code generation */
        @keyframes qrScaleIn {
            from {
                transform: scale(0.8);
                opacity: 0;
            }
            to {
                transform: scale(1);
                opacity: 1;
            }
        }

        #qrCode {
            animation: qrScaleIn 0.5s ease-out;
        }