diff --git a/bun.lock b/bun.lock
index c8f8356..ec3014b 100644
--- a/bun.lock
+++ b/bun.lock
@@ -19,6 +19,7 @@
         "rehype-katex": "^7.0.1",
         "rehype-pretty-code": "^0.14.3",
         "rehype-slug": "^6.0.0",
+        "remark-frontmatter": "^5.0.0",
         "remark-gfm": "^4.0.1",
         "remark-math": "^6.0.0",
         "remark-smartypants": "^3.0.2",
@@ -575,6 +576,8 @@
 
     "fastq": ["fastq@1.20.1", "", { "dependencies": { "reusify": "^1.0.4" } }, "sha512-GGToxJ/w1x32s/D2EKND7kTil4n8OVk/9mycTc4VDza13lOvpUZTGX3mFSCtV9ksdGBVzvsyAVLM6mHFThxXxw=="],
 
+    "fault": ["fault@2.0.1", "", { "dependencies": { "format": "^0.2.0" } }, "sha512-WtySTkS4OKev5JtpHXnib4Gxiurzh5NCGvWrFaZ34m6JehfTUhKZvn9njTfw48t6JumVQOmrKqpmGcdwxnhqBQ=="],
+
     "fdir": ["fdir@6.5.0", "", { "peerDependencies": { "picomatch": "^3 || ^4" }, "optionalPeers": ["picomatch"] }, "sha512-tIbYtZbucOs0BRGqPJkshJUYdL+SDH7dVM8gjy+ERp3WAUjLEFJE+02kanyHtwjWOnwrKYBiwAmM0p4kLJAnXg=="],
 
     "file-entry-cache": ["file-entry-cache@8.0.0", "", { "dependencies": { "flat-cache": "^4.0.0" } }, "sha512-XXTUwCvisa5oacNGRP9SfNtYBNAMi+RPwBFmblZEF7N7swHYQS6/Zfk7SRwx4D5j3CH211YNRco1DEMNVfZCnQ=="],
@@ -589,6 +592,8 @@
 
     "for-each": ["for-each@0.3.5", "", { "dependencies": { "is-callable": "^1.2.7" } }, "sha512-dKx12eRCVIzqCxFGplyFKJMPvLEWgmNtUrpTiJIR5u97zEhRG8ySrtboPHZXx7daLxQVrl643cTzbab2tkQjxg=="],
 
+    "format": ["format@0.2.2", "", {}, "sha512-wzsgA6WOq+09wrU1tsJ09udeR/YZRaeArL9e1wPbFg3GG2yDnC2ldKpxs4xunpFF9DgqCqOIra3bc1HWrJ37Ww=="],
+
     "framer-motion": ["framer-motion@12.40.0", "", { "dependencies": { "motion-dom": "^12.40.0", "motion-utils": "^12.39.0", "tslib": "^2.4.0" }, "peerDependencies": { "@emotion/is-prop-valid": "*", "react": "^18.0.0 || ^19.0.0", "react-dom": "^18.0.0 || ^19.0.0" }, "optionalPeers": ["@emotion/is-prop-valid", "react", "react-dom"] }, "sha512-uaBd3qC1v3KQqBEjwTUd183K6PbS+j0yR9w9VmEOLWA/tnUcSn8Xa3uck7t4dgpDoUss8xQTcj8W2L07lrnLFg=="],
 
     "function-bind": ["function-bind@1.1.2", "", {}, "sha512-7XHNxH7qX9xG5mIwxkhumTox/MIRNcOgDrxWsMt2pAr23WHp6MrRlN7FBSFpCpr+oVO0F744iUgR82nJMfG2SA=="],
@@ -829,6 +834,8 @@
 
     "mdast-util-from-markdown": ["mdast-util-from-markdown@2.0.3", "", { "dependencies": { "@types/mdast": "^4.0.0", "@types/unist": "^3.0.0", "decode-named-character-reference": "^1.0.0", "devlop": "^1.0.0", "mdast-util-to-string": "^4.0.0", "micromark": "^4.0.0", "micromark-util-decode-numeric-character-reference": "^2.0.0", "micromark-util-decode-string": "^2.0.0", "micromark-util-normalize-identifier": "^2.0.0", "micromark-util-symbol": "^2.0.0", "micromark-util-types": "^2.0.0", "unist-util-stringify-position": "^4.0.0" } }, "sha512-W4mAWTvSlKvf8L6J+VN9yLSqQ9AOAAvHuoDAmPkz4dHf553m5gVj2ejadHJhoJmcmxEnOv6Pa8XJhpxE93kb8Q=="],
 
+    "mdast-util-frontmatter": ["mdast-util-frontmatter@2.0.1", "", { "dependencies": { "@types/mdast": "^4.0.0", "devlop": "^1.0.0", "escape-string-regexp": "^5.0.0", "mdast-util-from-markdown": "^2.0.0", "mdast-util-to-markdown": "^2.0.0", "micromark-extension-frontmatter": "^2.0.0" } }, "sha512-LRqI9+wdgC25P0URIJY9vwocIzCcksduHQ9OF2joxQoyTNVduwLAFUzjoopuRJbJAReaKrNQKAZKL3uCMugWJA=="],
+
     "mdast-util-gfm": ["mdast-util-gfm@3.1.0", "", { "dependencies": { "mdast-util-from-markdown": "^2.0.0", "mdast-util-gfm-autolink-literal": "^2.0.0", "mdast-util-gfm-footnote": "^2.0.0", "mdast-util-gfm-strikethrough": "^2.0.0", "mdast-util-gfm-table": "^2.0.0", "mdast-util-gfm-task-list-item": "^2.0.0", "mdast-util-to-markdown": "^2.0.0" } }, "sha512-0ulfdQOM3ysHhCJ1p06l0b0VKlhU0wuQs3thxZQagjcjPrlFRqY215uZGHHJan9GEAXd9MbfPjFJz+qMkVR6zQ=="],
 
     "mdast-util-gfm-autolink-literal": ["mdast-util-gfm-autolink-literal@2.0.1", "", { "dependencies": { "@types/mdast": "^4.0.0", "ccount": "^2.0.0", "devlop": "^1.0.0", "mdast-util-find-and-replace": "^3.0.0", "micromark-util-character": "^2.0.0" } }, "sha512-5HVP2MKaP6L+G6YaxPNjuL0BPrq9orG3TsrZ9YXbA3vDw/ACI4MEsnoDpn6ZNm7GnZgtAcONJyPhOP8tNJQavQ=="],
@@ -865,6 +872,8 @@
 
     "micromark-core-commonmark": ["micromark-core-commonmark@2.0.3", "", { "dependencies": { "decode-named-character-reference": "^1.0.0", "devlop": "^1.0.0", "micromark-factory-destination": "^2.0.0", "micromark-factory-label": "^2.0.0", "micromark-factory-space": "^2.0.0", "micromark-factory-title": "^2.0.0", "micromark-factory-whitespace": "^2.0.0", "micromark-util-character": "^2.0.0", "micromark-util-chunked": "^2.0.0", "micromark-util-classify-character": "^2.0.0", "micromark-util-html-tag-name": "^2.0.0", "micromark-util-normalize-identifier": "^2.0.0", "micromark-util-resolve-all": "^2.0.0", "micromark-util-subtokenize": "^2.0.0", "micromark-util-symbol": "^2.0.0", "micromark-util-types": "^2.0.0" } }, "sha512-RDBrHEMSxVFLg6xvnXmb1Ayr2WzLAWjeSATAoxwKYJV94TeNavgoIdA0a9ytzDSVzBy2YKFK+emCPOEibLeCrg=="],
 
+    "micromark-extension-frontmatter": ["micromark-extension-frontmatter@2.0.0", "", { "dependencies": { "fault": "^2.0.0", "micromark-util-character": "^2.0.0", "micromark-util-symbol": "^2.0.0", "micromark-util-types": "^2.0.0" } }, "sha512-C4AkuM3dA58cgZha7zVnuVxBhDsbttIMiytjgsM2XbHAB2faRVaHRle40558FBN+DJcrLNCoqG5mlrpdU4cRtg=="],
+
     "micromark-extension-gfm": ["micromark-extension-gfm@3.0.0", "", { "dependencies": { "micromark-extension-gfm-autolink-literal": "^2.0.0", "micromark-extension-gfm-footnote": "^2.0.0", "micromark-extension-gfm-strikethrough": "^2.0.0", "micromark-extension-gfm-table": "^2.0.0", "micromark-extension-gfm-tagfilter": "^2.0.0", "micromark-extension-gfm-task-list-item": "^2.0.0", "micromark-util-combine-extensions": "^2.0.0", "micromark-util-types": "^2.0.0" } }, "sha512-vsKArQsicm7t0z2GugkCKtZehqUm31oeGBV/KVSorWSy8ZlNAv7ytjFhvaryUiCUJYqs+NoE6AFhpQvBTM6Q4w=="],
 
     "micromark-extension-gfm-autolink-literal": ["micromark-extension-gfm-autolink-literal@2.1.0", "", { "dependencies": { "micromark-util-character": "^2.0.0", "micromark-util-sanitize-uri": "^2.0.0", "micromark-util-symbol": "^2.0.0", "micromark-util-types": "^2.0.0" } }, "sha512-oOg7knzhicgQ3t4QCjCWgTmfNhvQbDDnJeVu9v81r7NltNCVmhPy1fJRX27pISafdjL+SVc4d3l48Gb6pbRypw=="],
@@ -1061,6 +1070,8 @@
 
     "rehype-slug": ["rehype-slug@6.0.0", "", { "dependencies": { "@types/hast": "^3.0.0", "github-slugger": "^2.0.0", "hast-util-heading-rank": "^3.0.0", "hast-util-to-string": "^3.0.0", "unist-util-visit": "^5.0.0" } }, "sha512-lWyvf/jwu+oS5+hL5eClVd3hNdmwM1kAC0BUvEGD19pajQMIzcNUd/k9GsfQ+FfECvX+JE+e9/btsKH0EjJT6A=="],
 
+    "remark-frontmatter": ["remark-frontmatter@5.0.0", "", { "dependencies": { "@types/mdast": "^4.0.0", "mdast-util-frontmatter": "^2.0.0", "micromark-extension-frontmatter": "^2.0.0", "unified": "^11.0.0" } }, "sha512-XTFYvNASMe5iPN0719nPrdItC9aU0ssC4v14mH1BCi1u0n1gAocqcujWUrByftZTbLhRtiKRyjYTSIOcr69UVQ=="],
+
     "remark-gfm": ["remark-gfm@4.0.1", "", { "dependencies": { "@types/mdast": "^4.0.0", "mdast-util-gfm": "^3.0.0", "micromark-extension-gfm": "^3.0.0", "remark-parse": "^11.0.0", "remark-stringify": "^11.0.0", "unified": "^11.0.0" } }, "sha512-1quofZ2RQ9EWdeN34S79+KExV1764+wCUGop5CPL1WGdD0ocPpu91lzPGbwWMECpEpd42kJGQwzRfyov9j4yNg=="],
 
     "remark-math": ["remark-math@6.0.0", "", { "dependencies": { "@types/mdast": "^4.0.0", "mdast-util-math": "^3.0.0", "micromark-extension-math": "^3.0.0", "unified": "^11.0.0" } }, "sha512-MMqgnP74Igy+S3WwnhQ7kqGlEerTETXMvJhrUzDikVZ2/uogJCb+WHUg97hK9/jcfc0dkD73s3LN8zU49cTEtA=="],
@@ -1303,6 +1314,8 @@
 
     "mdast-util-find-and-replace/escape-string-regexp": ["escape-string-regexp@5.0.0", "", {}, "sha512-/veY75JbMK4j1yjvuUxuVsiS/hr/4iHs9FTT6cgTexxdE0Ly/glccBAkloH/DofkjRbZU3bnoj38mOmhkZ0lHw=="],
 
+    "mdast-util-frontmatter/escape-string-regexp": ["escape-string-regexp@5.0.0", "", {}, "sha512-/veY75JbMK4j1yjvuUxuVsiS/hr/4iHs9FTT6cgTexxdE0Ly/glccBAkloH/DofkjRbZU3bnoj38mOmhkZ0lHw=="],
+
     "micromark-extension-math/katex": ["katex@0.16.47", "", { "dependencies": { "commander": "^8.3.0" }, "bin": { "katex": "cli.js" } }, "sha512-Eeo8Ys1doU1z+x8AZsPpQu+p/QcZBI5PeOo7QGQdy2x2m0MU/hYagBbGOmXwr5KVbEfVuWv9LpnQWeehogurjg=="],
 
     "micromatch/picomatch": ["picomatch@2.3.2", "", {}, "sha512-V7+vQEJ06Z+c5tSye8S+nHUfI51xoXIXjHQ99cQtKUkQqqO1kO/KCJUfZXuB47h/YBlDhah2H3hdUGXn8ie0oA=="],
diff --git a/lib/mdx-hast-visitor.js b/lib/mdx-hast-visitor.js
new file mode 100644
index 0000000..ed0b616
--- /dev/null
+++ b/lib/mdx-hast-visitor.js
@@ -0,0 +1,26 @@
+/**
+ * HAST visitor plugin that adds data-line-numbers attribute to code blocks
+ * inside <pre> elements.
+ */
+import { visit } from 'unist-util-visit'
+
+/**
+ * Rehype plugin that adds line number indicators to code blocks.
+ * @returns {import('unified').Plugin<[], import('hast').Root>}
+ */
+export default function addLineNumbers() {
+  return function attacher(tree) {
+    visit(tree, 'element', function visitor(node) {
+      if (
+        node.tagName === 'pre' &&
+        node.children?.length === 1 &&
+        node.children[0].type === 'element' &&
+        node.children[0].tagName === 'code'
+      ) {
+        const code = node.children[0]
+        code.properties = code.properties || {}
+        code.properties['data-line-numbers'] = ''
+      }
+    })
+  }
+}
diff --git a/next.config.ts b/next.config.ts
index 0bd1498..d8c529c 100644
--- a/next.config.ts
+++ b/next.config.ts
@@ -9,17 +9,13 @@ const nextConfig: NextConfig = {
 
 const withMDX = createMDX({
   options: {
-    remarkPlugins: ['remark-smartypants', 'remark-math', 'remark-gfm'],
+    remarkPlugins: ['remark-frontmatter', 'remark-smartypants', 'remark-math', 'remark-gfm'],
     rehypePlugins: [
       'rehype-slug',
       ['rehype-external-links', { target: '_blank', rel: ['nofollow', 'noopener', 'noreferrer'] }],
       'rehype-autolink-headings',
-      ['rehype-pretty-code', {
-        theme: { light: 'github-light', dark: 'github-dark-dimmed' },
-        keepBackground: false,
-        lineNumbers: true,
-        grid: true,
-      }],
+      ['rehype-pretty-code', { theme: { light: 'github-light', dark: 'github-dark-dimmed' }, keepBackground: false, grid: true }],
+      '/mnt/blog/new-blog/lib/mdx-hast-visitor.js',
       'rehype-katex',
     ],
   },
diff --git a/package.json b/package.json
index 37561a1..a9212ba 100644
--- a/package.json
+++ b/package.json
@@ -2,6 +2,7 @@
   "name": "new-blog",
   "version": "0.1.0",
   "private": true,
+  "type": "module",
   "scripts": {
     "dev": "next dev",
     "build": "next build",