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	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Portable Offline Markdown Viewer</title>
	<style>
	body, html {
	margin: 0;
	padding: 0;
	height: 100%;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
	overflow: hidden; /* Prevent body scrollbars when panes are full height */
	}

	.container {
	display: flex;
	height: 100vh; /* Full viewport height */
	width: 100vw; /* Full viewport width */
	}

	.pane {
	flex-grow: 1; /* Panes share space equally by default */
	flex-basis: 0; /* Allow flex-grow to distribute space from a zero basis */
	overflow: auto; /* Add scrollbars if content overflows */
	padding: 15px;
	box-sizing: border-box;
	height: 100%; /* Make panes take full height of container */
	}

	#input-pane {
	background-color: #fdfdfd;
	border-right: 1px solid #e0e0e0; /* Subtle border */
	}

	#markdown-input {
	width: 100%;
	height: 100%;
	border: 1px solid #d1d5da;
	box-sizing: border-box;
	padding: 10px;
	font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
	font-size: 14px;
	line-height: 1.5;
	resize: none; /* Disable textarea's own resizer */
	background-color: #fff;
	color: #24292e;
	}
	#markdown-input:focus {
	outline: none;
	border-color: #0366d6;
	box-shadow: 0 0 0 2px rgba(3, 102, 214, 0.3);
	}


	#output-pane {
	background-color: #ffffff;
	padding-left: 20px; /* More space from resizer */
	}

	#html-output {
	width: 100%;
	height: 100%;
	color: #24292e;
	line-height: 1.6;
	}

	/* Basic Markdown Styling (inspired by GitHub) */
	#html-output h1, #html-output h2, #html-output h3, #html-output h4, #html-output h5, #html-output h6 {
	margin-top: 24px;
	margin-bottom: 16px;
	font-weight: 600;
	line-height: 1.25;
	border-bottom: 1px solid #eaecef;
	padding-bottom: 0.3em;
	}
	#html-output h1 { font-size: 2em; }
	#html-output h2 { font-size: 1.5em; }
	#html-output h3 { font-size: 1.25em; }
	#html-output p { margin-top: 0; margin-bottom: 16px; }
	#html-output ul, #html-output ol { margin-top: 0; margin-bottom: 16px; padding-left: 2em; }
	#html-output li > p { margin-bottom: 0.2em; } /* Less space for p inside li */
	#html-output blockquote {
	margin: 0 0 16px 0;
	padding: 0 1em;
	color: #6a737d;
	border-left: 0.25em solid #dfe2e5;
	}
	#html-output code {
	padding: 0.2em 0.4em;
	margin: 0;
	font-size: 85%;
	background-color: rgba(27,31,35,0.05);
	border-radius: 3px;
	font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
	}
	#html-output pre {
	padding: 16px;
	overflow: auto;
	font-size: 85%;
	line-height: 1.45;
	background-color: #f6f8fa;
	border-radius: 3px;
	margin-bottom: 16px;
	word-wrap: normal; /* Allow horizontal scroll for long lines */
	}
	#html-output pre code {
	padding: 0;
	margin: 0;
	font-size: 100%;
	background-color: transparent;
	border-radius: 0;
	display: inline;
	max-width: auto;
	overflow: visible;
	line-height: inherit;
	word-wrap: normal;
	}
	#html-output table {
	border-collapse: collapse;
	margin-top: 0;
	margin-bottom: 16px;
	display: block;
	width: max-content;
	max-width: 100%;
	overflow: auto;
	}
	#html-output th, #html-output td {
	padding: 6px 13px;
	border: 1px solid #dfe2e5;
	}
	#html-output th { font-weight: 600; }
	#html-output hr {
	height: 0.25em;
	padding: 0;
	margin: 24px 0;
	background-color: #e1e4e8;
	border: 0;
	}
	#html-output img { max-width: 100%; box-sizing: content-box; background-color: #fff; }


	.resizer {
	width: 10px;
	background-color: #e0e0e0; /* Slightly darker for better visibility */
	cursor: col-resize;
	flex-shrink: 0; /* Prevent resizer from shrinking */
	display: flex;
	align-items: center;
	justify-content: center;
	position: relative; /* For pseudo-element positioning */
	z-index: 10;
	}
	.resizer:hover {
	background-color: #c0c0c0;
	}
	.resizer::before { /* Visual grip dots */
	content: '⋮';
	color: #666;
	font-size: 14px;
	line-height: 0; /* Center vertically */
	}
	</style>
	<!-- Make sure marked.min.js is in the same folder as this HTML file -->
	<script src="marked.min.js"></script>
	</head>
	<body>
	<div class="container">
	<div class="pane" id="input-pane">
	<textarea id="markdown-input" placeholder="Paste or type Markdown here..."></textarea>
	</div>
	<div class="resizer" id="dragMe"></div>
	<div class="pane" id="output-pane">
	<div id="html-output"></div>
	</div>
	</div>

	<script>
	const markdownInput = document.getElementById('markdown-input');
	const htmlOutput = document.getElementById('html-output');
	const resizer = document.getElementById('dragMe');
	const leftPane = document.getElementById('input-pane');
	const rightPane = document.getElementById('output-pane');
	const container = document.querySelector('.container');

	// Function to render Markdown
	function renderMarkdown() {
	const mdText = markdownInput.value;
	try {
	// Using marked.parse() for marked v4+
	// gfm: true for GitHub Flavored Markdown
	// breaks: true for rendering single newlines as <br> (common preference)
	htmlOutput.innerHTML = marked.parse(mdText, { gfm: true, breaks: true, pedantic: false });
	} catch (e) {
	// Fallback for older marked versions or if marked.parse is not available
	try {
	htmlOutput.innerHTML = marked(mdText, { gfm: true, breaks: true, pedantic: false });
	} catch (innerErr) {
	htmlOutput.innerHTML = "<p style='color:red;'>Error rendering Markdown. Check browser console.</p>";
	console.error("Markdown rendering error:", innerErr);
	}
	}
	}

	// Initial render and on input
	markdownInput.addEventListener('input', renderMarkdown);

	// Resizer logic
	let isResizing = false;

	resizer.addEventListener('mousedown', (e) => {
	e.preventDefault(); // Prevent text selection during drag
	isResizing = true;
	document.body.style.userSelect = 'none'; // Prevent text selection globally

	// Set flex-grow to 0 so flex-basis takes full control during resize
	leftPane.style.flexGrow = '0';
	rightPane.style.flexGrow = '0';

	document.addEventListener('mousemove', handleMouseMove);
	document.addEventListener('mouseup', stopResize);
	});

	function handleMouseMove(e) {
	if (!isResizing) return;

	const containerRect = container.getBoundingClientRect();
	let leftWidth = e.clientX - containerRect.left;

	// Minimum pane width (e.g., 30px to still see/drag resizer)
	// Set to 0 if you want to allow complete collapse, but might be hard to reopen.
	const minPaneWidth = 30;
	const resizerWidth = resizer.offsetWidth;

	// Constrain left pane
	if (leftWidth < minPaneWidth) {
	leftWidth = minPaneWidth;
	}
	if (leftWidth > containerRect.width - resizerWidth - minPaneWidth) {
	leftWidth = containerRect.width - resizerWidth - minPaneWidth;
	}

	const rightWidth = containerRect.width - leftWidth - resizerWidth;

	leftPane.style.flexBasis = `${leftWidth}px`;
	rightPane.style.flexBasis = `${rightWidth}px`;
	}

	function stopResize() {
	isResizing = false;
	document.body.style.userSelect = ''; // Re-enable text selection
	document.removeEventListener('mousemove', handleMouseMove);
	document.removeEventListener('mouseup', stopResize);
	// The flex-grow 0 and pixel-based flex-basis will persist.
	// This means after a manual resize, the panes won't auto-adjust to window resizes
	// unless we convert back to percentages or restore flex-grow:1.
	// For this tool, fixed pixel widths after manual drag is often acceptable.
	}

	// Set some default Markdown content
	markdownInput.value = `# Welcome to Your Offline Markdown Viewer!

	## How to Use
	1. Paste or type your Markdown text into this left pane.
	2. The rendered HTML will appear live in the right pane.
	3. Drag the vertical bar in the middle to resize the panes. You can shrink one pane almost completely to focus on the other.

	## Features
	* Live Preview: Updates as you type.
	* GitHub Flavored Markdown (GFM): Includes support for tables, fenced code blocks, etc.
	* Line Breaks: Single newlines are rendered as line breaks (\`<br>\`).
	* Portable & Offline: Just this HTML file and \`marked.min.js\` in the same folder. No installation needed!

	---

	### Example Markdown:

	\`\`\`javascript
	// Code block example
	function greet(name) {
	return \`Hello, \${name}!\`;
	}
	console.log(greet("Markdown User"));
	\`\`\`

	- Item 1
	- Item 2
	- Sub-item A
	- Sub-item B

	> This is a blockquote. It's useful for highlighting text.

	Bold text, italic text, and \`inline code\`.

	A horizontal rule:
	***

	A table:

	\| Header 1 \| Header 2 \| Header 3 \|
	\|----------\|----------\|----------\|
	\| Cell 1A \| Cell 2A \| Cell 3A \|
	\| Cell 1B \| Cell 2B \| Cell 3B \|
	`;
	renderMarkdown(); // Render the default text on load

	</script>
	</body>
	</html>