diff --git a/.github/scripts/inject_metadata.py b/.github/scripts/inject_metadata.py
new file mode 100644
index 0000000..a12d89d
--- /dev/null
+++ b/.github/scripts/inject_metadata.py
@@ -0,0 +1,104 @@
+#!/usr/bin/env python3
+"""
+Generates _data/page_metadata.json with git metadata for every Markdown file.
+Uses the GitHub API when GITHUB_TOKEN is set, otherwise falls back to git log.
+Source .md files are never modified.
+"""
+import json
+import os
+import subprocess
+import sys
+import urllib.error
+import urllib.parse
+import urllib.request
+from pathlib import Path
+
+REPO = "codeday/docs"
+TOKEN = os.environ.get("GITHUB_TOKEN")
+
+
+def github_commits(file_path: str):
+    if not TOKEN:
+        return None
+    url = f"https://api.github.com/repos/{REPO}/commits?path={urllib.parse.quote(file_path)}&per_page=100"
+    req = urllib.request.Request(
+        url,
+        headers={
+            "Authorization": f"Bearer {TOKEN}",
+            "Accept": "application/vnd.github.v3+json",
+        },
+    )
+    try:
+        with urllib.request.urlopen(req) as r:
+            return json.loads(r.read())
+    except urllib.error.HTTPError as e:
+        print(f"  GitHub API {e.code} for {file_path}", file=sys.stderr)
+        return None
+
+
+def get_metadata(file_path: str) -> dict:
+    commits = github_commits(file_path)
+    if commits:
+        last = commits[0]["commit"]["committer"]["date"].split("T")[0]
+        latest = commits[0]
+        last_login = (latest.get("author") or {}).get("login")
+        last_name = latest["commit"]["author"]["name"]
+
+        seen, authors = set(), []
+        for c in commits:
+            login = (c.get("author") or {}).get("login")
+            name = c["commit"]["author"]["name"]
+            key = login or name
+            if key not in seen:
+                seen.add(key)
+                authors.append({"login": login, "name": name})
+
+        return {
+            "last_modified_date": last,
+            "last_modified_by": {"login": last_login, "name": last_name},
+            "authors": authors,
+        }
+
+    # Fallback: local git log
+    last_commit = subprocess.run(
+        ["git", "log", "-1", "--format=%ai\t%an", "--", file_path],
+        capture_output=True, text=True,
+    ).stdout.strip()
+    last_date, last_author_name = (last_commit.split("\t") + ["", ""])[:2]
+    last_date = last_date.split(" ")[0] or None
+
+    authors_out = subprocess.run(
+        ["git", "log", "--format=%an", "--", file_path],
+        capture_output=True, text=True,
+    ).stdout.strip().split("\n")
+    seen, authors = set(), []
+    for name in authors_out:
+        if name and name not in seen:
+            seen.add(name)
+            authors.append({"login": None, "name": name})
+
+    return {
+        "last_modified_date": last_date,
+        "last_modified_by": {"login": None, "name": last_author_name} if last_author_name else None,
+        "authors": authors,
+    }
+
+
+# ---- main ---------------------------------------------------------------
+source = Path(__file__).parent.parent.parent
+md_files = [
+    p for p in source.rglob("*.md")
+    if not any(part.startswith(".") or part in ("_site", "node_modules") for part in p.parts)
+]
+
+metadata = {}
+for filepath in sorted(md_files):
+    rel = str(filepath.relative_to(source))
+    print(f"Processing {rel} …", end=" ", flush=True)
+    metadata[rel] = get_metadata(rel)
+    print("done")
+
+out = source / "_data" / "page_metadata.json"
+out.parent.mkdir(exist_ok=True)
+out.write_text(json.dumps(metadata, indent=2), encoding="utf-8")
+print(f"\nWrote {out.relative_to(source)} ({len(metadata)} entries)")
diff --git a/.github/workflows/jekyll.yml b/.github/workflows/jekyll.yml
index 61f2d80..756ca31 100644
--- a/.github/workflows/jekyll.yml
+++ b/.github/workflows/jekyll.yml
@@ -33,6 +33,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
       - name: Setup Ruby
         # https://github.com/ruby/setup-ruby/releases/tag/v1.207.0
         uses: ruby/setup-ruby@4a9ddd6f338a97768b8006bf671dfbad383215f4
@@ -43,6 +45,10 @@ jobs:
       - name: Setup Pages
         id: pages
         uses: actions/configure-pages@v5
+      - name: Inject page metadata
+        run: python3 .github/scripts/inject_metadata.py
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Build with Jekyll
         # Outputs to the './_site' directory by default
         run: bundle exec jekyll build --baseurl "${{ steps.pages.outputs.base_path }}"
diff --git a/.ruby-version b/.ruby-version
new file mode 100644
index 0000000..9c25013
--- /dev/null
+++ b/.ruby-version
@@ -0,0 +1 @@
+3.3.6
diff --git a/_includes/footer_custom.html b/_includes/footer_custom.html
new file mode 100644
index 0000000..bda6d9c
--- /dev/null
+++ b/_includes/footer_custom.html
@@ -0,0 +1,49 @@
+{% assign meta = site.data.page_metadata[page.path] %}
+{% if meta %}
+<div class="page-meta">
+  {% if meta.authors and meta.authors.size > 0 %}
+  <span class="page-meta-item">
+    {% if meta.authors.size > 1 %}Authors:{% else %}Author:{% endif %}
+    {% for author in meta.authors %}
+      {% if author.login %}
+        <a href="https://github.com/{{ author.login }}" target="_blank" rel="noopener">{{ author.name | default: author.login }}</a>
+      {% else %}
+        {{ author.name }}
+      {% endif %}
+      {% unless forloop.last %}, {% endunless %}
+    {% endfor %}
+  </span>
+  {% endif %}
+  {% if meta.last_modified_date %}
+  <span class="page-meta-item">
+    Last modified {{ meta.last_modified_date | date: "%b %-d, %Y" }}
+    {% if meta.last_modified_by %}
+      by
+      {% if meta.last_modified_by.login %}
+        <a href="https://github.com/{{ meta.last_modified_by.login }}" target="_blank" rel="noopener">{{ meta.last_modified_by.name | default: meta.last_modified_by.login }}</a>
+      {% else %}
+        {{ meta.last_modified_by.name }}
+      {% endif %}
+    {% endif %}
+  </span>
+  {% endif %}
+</div>
+{% endif %}
+
+<style>
+.page-meta {
+  margin-top: 0.75rem;
+  display: flex;
+  flex-wrap: wrap;
+  gap: 1rem;
+  font-size: 0.8rem;
+  color: inherit;
+  opacity: 0.75;
+  margin-bottom: 1rem;
+}
+.page-meta-item {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.3rem;
+}
+</style>