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<!DOCTYPE html>
<html>
<head>
    <title>Web Code IDE</title>
    <meta charset="UTF-8">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.63.0/codemirror.min.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.63.0/theme/monokai.min.css">
    <style>
        /* styles.css */
        body {
            margin: 0;
            padding: 0;
            font-family: Arial, sans-serif;
            height: 100vh;
        }

        .container {
            display: flex;
            height: 100vh;
        }

        .editor-container {
            width: 60%;
            background: #1e1e1e;
            display: flex;
            flex-direction: column;
        }

        .preview-container {
            width: 40%;
            border-left: 2px solid #333;
        }

        .tabs {
            display: flex;
            background: #252526;
        }

        .tab {
            padding: 10px 20px;
            color: #fff;
            cursor: pointer;
            border-right: 1px solid #333;
        }

        .tab.active {
            background: #1e1e1e;
        }

        .code-editor {
            height: 33.33%;
            overflow: hidden;
        }

        .CodeMirror {
            height: 100% !important;
        }

        #preview {
            width: 100%;
            height: 100%;
            border: none;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="editor-container">
            <div class="tabs">
                <div class="tab active" onclick="showEditor('html')">HTML</div>
                <div class="tab" onclick="showEditor('css')">CSS</div>
                <div class="tab" onclick="showEditor('js')">JavaScript</div>
            </div>
            <div id="html-editor" class="code-editor"></div>
            <div id="css-editor" class="code-editor" style="display: none"></div>
            <div id="js-editor" class="code-editor" style="display: none"></div>
        </div>
        <div class="preview-container">
            <iframe id="preview"></iframe>
        </div>
    </div>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.63.0/codemirror.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.63.0/mode/htmlmixed/htmlmixed.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.63.0/mode/css/css.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.63.0/mode/javascript/javascript.min.js"></script>

    <script>
        // script.js
        let htmlEditor = CodeMirror(document.getElementById('html-editor'), {
            mode: 'htmlmixed',
            theme: 'monokai',
            lineNumbers: true,
            value: '<!DOCTYPE html>\n<html>\n<head>\n\t<title>Demo</title>\n</head>\n<body>\n\t<h1>Hello World</h1>\n</body>\n</html>'
        });

        let cssEditor = CodeMirror(document.getElementById('css-editor'), {
            mode: 'css',
            theme: 'monokai',
            lineNumbers: true,
            value: 'h1 { color: blue; }'
        });

        let jsEditor = CodeMirror(document.getElementById('js-editor'), {
            mode: 'javascript',
            theme: 'monokai',
            lineNumbers: true,
            value: 'console.log("Hello from JS!");'
        });

        function showEditor(language) {
            document.querySelectorAll('.code-editor').forEach(editor => {
                editor.style.display = 'none';
            });
            document.querySelectorAll('.tab').forEach(tab => {
                tab.classList.remove('active');
            });
            document.getElementById(`${language}-editor`).style.display = 'block';
            event.target.classList.add('active');
        }

        function updatePreview() {
            const html = htmlEditor.getValue();
            const css = cssEditor.getValue();
            const js = jsEditor.getValue();
            
            const preview = document.getElementById('preview').contentWindow.document;
            preview.open();
            preview.write(`
                <!DOCTYPE html>
                <html>
                <head>
                    <style>${css}</style>
                </head>
                <body>
                    ${html}
                    <script>${js}<\/script>
                </body>
                </html>
            `);
            preview.close();
        }

        // Update preview on code changes
        [htmlEditor, cssEditor, jsEditor].forEach(editor => {
            editor.on('change', () => {
                updatePreview();
            });
        });

        // Initial preview
        updatePreview();
    </script>
</body>
</html>