    <style>
        * {
            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;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .window {
            background: #f0e6f6;
            border: 2px solid #fff;
            box-shadow: 
                inset 1px 1px 0 rgba(255,255,255,0.8),
                inset -1px -1px 0 rgba(0,0,0,0.2),
                4px 4px 12px rgba(0,0,0,0.3);
            max-width: 1200px;
            width: 100%;
            border-radius: 8px 8px 0 0;
        }

        .title-bar {
            background: linear-gradient(to right, #c084fc, #e879f9);
            padding: 4px 6px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            border-radius: 6px 6px 0 0;
            border-bottom: 2px solid #a855f7;
        }

        .title-bar-text {
            display: flex;
            align-items: center;
            gap: 8px;
            color: white;
            font-weight: 600;
            font-size: 14px;
            text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
        }

        .title-icon {
            width: 20px;
            height: 20px;
            background: linear-gradient(135deg, #fbbf24, #f59e0b);
            border-radius: 4px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 12px;
        }

        .title-bar-controls {
            display: flex;
            gap: 4px;
        }

        .title-bar-controls button {
            width: 24px;
            height: 24px;
            border: 2px solid;
            border-color: #fdf4ff #d8b4fe #d8b4fe #fdf4ff;
            background: linear-gradient(to bottom, #f3e8ff, #e9d5ff);
            font-weight: bold;
            font-size: 12px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #6b21a8;
            border-radius: 2px;
        }

        .title-bar-controls button:active {
            border-color: #d8b4fe #fdf4ff #fdf4ff #d8b4fe;
            background: linear-gradient(to bottom, #e9d5ff, #f3e8ff);
        }

        .menu-bar {
            background: #f5eefa;
            border-bottom: 2px solid #ddd;
            display: flex;
            padding: 2px 4px;
        }

        .menu-item {
            padding: 4px 12px;
            cursor: pointer;
            font-size: 13px;
            color: #4a1d6d;
            position: relative;
        }

        .menu-item:hover {
            background: linear-gradient(to bottom, #e9d5ff, #ddd6fe);
        }

        .menu-item u {
            text-decoration: underline;
        }

        .window-body {
            display: flex;
            min-height: 500px;
            background: #faf5ff;
        }

        .left-panel, .right-panel {
            width: 200px;
            background: linear-gradient(to bottom, #fae8ff, #f3e8ff);
            border-right: 2px solid #e9d5ff;
            padding: 16px;
            transition: all 0.3s ease;
        }

        .right-panel {
            border-right: none;
            border-left: 2px solid #e9d5ff;
        }

        .left-panel.hidden, .right-panel.hidden {
            width: 0;
            padding: 0;
            overflow: hidden;
        }

        .center-panel {
            flex: 1;
            padding: 20px;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 16px;
            overflow-y: auto;
        }

        .content-box {
            background: white;
            border: 2px solid;
            border-color: #e9d5ff #c084fc #c084fc #e9d5ff;
            padding: 16px;
            border-radius: 12px;
            box-shadow: 2px 2px 4px rgba(0,0,0,0.1);
        }

        .content-box h3 {
            color: #7c3aed;
            font-size: 16px;
            margin-bottom: 10px;
            padding-bottom: 8px;
            border-bottom: 2px solid #e9d5ff;
        }

        .content-box p {
            color: #4a1d6d;
            font-size: 13px;
            line-height: 1.5;
        }

        .panel-title {
            color: #7c3aed;
            font-weight: 600;
            font-size: 14px;
            margin-bottom: 12px;
            padding-bottom: 6px;
            border-bottom: 2px solid #e9d5ff;
        }

        .panel-item {
            background: white;
            padding: 8px;
            margin-bottom: 8px;
            border: 1px solid #e9d5ff;
            border-radius: 3px;
            font-size: 12px;
            color: #4a1d6d;
            cursor: pointer;
        }

        .panel-item:hover {
            background: #faf5ff;
            border-color: #c084fc;
        }

        .status-bar {
            background: linear-gradient(to bottom, #f3e8ff, #e9d5ff);
            border-top: 2px solid #ddd;
            padding: 4px 8px;
            font-size: 12px;
            color: #4a1d6d;
            display: flex;
            gap: 16px;
        }

        .home-screen {
            display: none;
            text-align: center;
            padding: 60px 20px;
        }

        .home-screen.active {
            display: block;
        }

        .home-screen h1 {
            color: #7c3aed;
            font-size: 48px;
            margin-bottom: 20px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
        }

        .home-screen p {
            color: #4a1d6d;
            font-size: 18px;
            margin-bottom: 30px;
        }

        .theme-selector {
            display: flex;
            gap: 20px;
            justify-content: center;
            margin-bottom: 20px;
        }

        .theme-option {
            background: white;
            border: 3px solid #e9d5ff;
            border-radius: 8px;
            padding: 30px;
            cursor: pointer;
            transition: all 0.3s ease;
            min-width: 200px;
        }

        .theme-option:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0,0,0,0.2);
        }

        .theme-option h3 {
            font-size: 24px;
            margin-bottom: 10px;
        }

        .theme-option p {
            font-size: 14px;
            margin-bottom: 15px;
        }

        .theme-preview {
            display: flex;
            gap: 5px;
            justify-content: center;
            margin-top: 15px;
        }

        .color-swatch {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            border: 2px solid rgba(0,0,0,0.1);
        }

        .home-button {
            background: linear-gradient(to bottom, #f3e8ff, #e9d5ff);
            border: 2px solid;
            border-color: #fdf4ff #c084fc #c084fc #fdf4ff;
            padding: 12px 24px;
            font-size: 14px;
            font-weight: 600;
            color: #7c3aed;
            cursor: pointer;
            border-radius: 4px;
        }

        .home-button:hover {
            background: linear-gradient(to bottom, #fae8ff, #f3e8ff);
        }






/* Professional Theme */

        body.professional-theme .window {
            background: #e2e8f0;
        }

        body.professional-theme .title-bar {
            background: linear-gradient(to right, #3b82f6, #2563eb);
            border-bottom: 2px solid #1d4ed8;
        }

        body.professional-theme .title-icon {
            background: linear-gradient(135deg, #94a3b8, #64748b);
        }

        body.professional-theme .title-bar-controls button {
            border-color: #f1f5f9 #94a3b8 #94a3b8 #f1f5f9;
            background: linear-gradient(to bottom, #f1f5f9, #e2e8f0);
            color: #334155;
        }

        body.professional-theme .title-bar-controls button:active {
            border-color: #94a3b8 #f1f5f9 #f1f5f9 #94a3b8;
            background: linear-gradient(to bottom, #e2e8f0, #f1f5f9);
        }

        body.professional-theme .menu-bar {
            background: #f8fafc;
        }

        body.professional-theme .menu-item {
            color: #334155;
        }

        body.professional-theme .menu-item:hover {
            background: linear-gradient(to bottom, #e2e8f0, #cbd5e1);
        }

        body.professional-theme .window-body {
            background: #f8fafc;
        }

        body.professional-theme .left-panel, body.professional-theme .right-panel {
            background: linear-gradient(to bottom, #f1f5f9, #e2e8f0);
            border-color: #cbd5e1;
        }

        body.professional-theme .content-box {
            border-color: #cbd5e1 #64748b #64748b #cbd5e1;
        }

        body.professional-theme .content-box h3 {
            color: #475569;
            border-bottom-color: #cbd5e1;
        }

        body.professional-theme .content-box p {
            color: #334155;
        }

        body.professional-theme .panel-title {
            color: #475569;
            border-bottom-color: #cbd5e1;
        }

        body.professional-theme .panel-item {
            border-color: #cbd5e1;
            color: #334155;
        }

        body.professional-theme .panel-item:hover {
            background: #f8fafc;
            border-color: #64748b;
        }

        body.professional-theme .status-bar {
            background: linear-gradient(to bottom, #e2e8f0, #cbd5e1);
            color: #334155;
        }

        body.professional-theme .home-screen h1 {
            color: #475569;
        }

        body.professional-theme .home-screen p {
            color: #334155;
        }

        body.professional-theme .about-screen h2 {
            color: #475569;
        }

        body.professional-theme .about-screen p {
            color: #334155;
        }

/* Cute Theme */
        body.cute-theme {
            background: linear-gradient(135deg, #ec4899 0%, #a855f7 100%);
        }

        body.cute-theme .window {
            background: #fce7f3;
        }

        body.cute-theme .title-bar {
            background: linear-gradient(to right, #f472b6, #c084fc);
            border-bottom: 2px solid #db2777;
        }

        body.cute-theme .title-icon {
            background: linear-gradient(135deg, #fbbf24, #f59e0b);
        }

        body.cute-theme .title-bar-controls button {
            border-color: #fce7f3 #f9a8d4 #f9a8d4 #fce7f3;
            background: linear-gradient(to bottom, #fce7f3, #fbcfe8);
            color: #831843;
        }

        body.cute-theme .title-bar-controls button:active {
            border-color: #f9a8d4 #fce7f3 #fce7f3 #f9a8d4;
            background: linear-gradient(to bottom, #fbcfe8, #fce7f3);
        }

        body.cute-theme .menu-bar {
            background: #fdf2f8;
        }

        body.cute-theme .menu-item {
            color: #831843;
        }

        body.cute-theme .menu-item:hover {
            background: linear-gradient(to bottom, #fbcfe8, #f9a8d4);
        }

        body.cute-theme .window-body {
            background: #fdf2f8;
        }

        body.cute-theme .left-panel, body.cute-theme .right-panel {
            background: linear-gradient(to bottom, #fce7f3, #fbcfe8);
            border-color: #f9a8d4;
        }

        body.cute-theme .content-box {
            border-color: #f9a8d4 #ec4899 #ec4899 #f9a8d4;
        }

        body.cute-theme .content-box h3 {
            color: #be185d;
            border-bottom-color: #f9a8d4;
        }

        body.cute-theme .content-box p {
            color: #831843;
        }

        body.cute-theme .panel-title {
            color: #be185d;
            border-bottom-color: #f9a8d4;
        }

        body.cute-theme .panel-item {
            border-color: #f9a8d4;
            color: #831843;
        }

        body.cute-theme .panel-item:hover {
            background: #fdf2f8;
            border-color: #ec4899;
        }

        body.cute-theme .status-bar {
            background: linear-gradient(to bottom, #fbcfe8, #f9a8d4);
            color: #831843;
        }

        body.cute-theme .home-screen h1 {
            color: #be185d;
        }

        body.cute-theme .home-screen p {
            color: #831843;
        }

        body.cute-theme .about-screen h2 {
            color: #be185d;
        }

        body.cute-theme .content-box h3::before {
            content: '✨ ';
        }

        body.cute-theme .panel-title::after {
            content: ' 💕';
        }

        .about-screen {
            display: none;
            padding: 40px;
        }

        .about-screen.active {
            display: block;
        }

        .about-screen h2 {
            color: #7c3aed;
            margin-bottom: 20px;
        }

        .about-screen p {
            color: #4a1d6d;
            line-height: 1.6;
            margin-bottom: 16px;
        }