diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 21e7ca2f..659c941a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -114,6 +114,27 @@ jobs:
       # silently ignored the fork we install above and built with upstream
       # mystmd (visible as 23 `unknown export output extension: *.ipynb`
       # errors, since ipynb export is a fork-only capability).
+      # Build the theme from per-page-thebe (adds enable_thebe/disable_thebe/
+      # default_thebe support). Remove this step once the feature ships in a
+      # tagged release and the template URL below is bumped to that release.
+      - name: Build theme (per-page-thebe)
+        run: |
+          git clone --depth 1 --branch per-page-thebe \
+            https://github.com/QuantEcon/quantecon-theme.mystmd.git /tmp/qe-theme
+          cd /tmp/qe-theme && npm ci && make build-theme
+          # Patch myst.yml to use the local build instead of the release zip.
+          python -c "
+          import re, os
+          path = os.path.join(os.environ['GITHUB_WORKSPACE'], 'lectures/myst.yml')
+          txt = open(path).read()
+          txt = re.sub(
+              r'template: https://github\.com/QuantEcon/quantecon-theme\.mystmd/releases/download/[^\n]+',
+              'template: /tmp/qe-theme/.deploy/quantecon-theme',
+              txt
+          )
+          open(path, 'w').write(txt)
+          "
+
       - name: Build HTML
         working-directory: ./lectures
         env:
diff --git a/lectures/functions.md b/lectures/functions.md
index db4f7ab4..c6249c62 100644
--- a/lectures/functions.md
+++ b/lectures/functions.md
@@ -17,6 +17,8 @@ downloads:
     title: Markdown (md)
   - file: exports/functions.ipynb
     title: IPython (.ipynb)
+site:
+  enable_thebe: true
 ---
 
 # Functions
diff --git a/lectures/matplotlib.md b/lectures/matplotlib.md
index b39e45a1..bd1042a7 100644
--- a/lectures/matplotlib.md
+++ b/lectures/matplotlib.md
@@ -17,6 +17,8 @@ downloads:
     title: Markdown (md)
   - file: exports/matplotlib.ipynb
     title: IPython (.ipynb)
+site:
+  enable_thebe: true
 ---
 
 # Matplotlib
diff --git a/lectures/myst.yml b/lectures/myst.yml
index 6884fd7d..aaaba069 100644
--- a/lectures/myst.yml
+++ b/lectures/myst.yml
@@ -80,6 +80,8 @@ project:
   error_rules:
     - rule: reference-syntax-valid
       severity: ignore
+  jupyter:
+    lite: true
   # exports:
   #   - id: book-pdf
   #     format: typst
@@ -109,3 +111,6 @@ site:
     launch_notebook_repo: QuantEcon/lecture-python-programming.notebooks
     launch_notebook_source_dir: lectures
     launch_colab: true
+    # Opt-in mode: Power toggle is hidden site-wide; only pages that set
+    # `site: enable_thebe: true` in their frontmatter show it.
+    default_thebe: false