scientific-python
diff --git a/.gitignore b/.gitignore
@@ -1,5 +1,5 @@
-.hugo*
 *~
-resources/
 public/
+_build/
+content/_build/
 .DS_Store
diff --git a/.gitmodules b/.gitmodules
@@ -1,6 +1,3 @@
-[submodule "themes/scientific-python-hugo-theme"]
-	path = themes/scientific-python-hugo-theme
-	url = https://github.com/scientific-python/scientific-python-hugo-theme
 [submodule "external-content/cookie"]
 	path = external-content/cookie
 	url = https://github.com/scientific-python/cookie
diff --git a/Makefile b/Makefile
@@ -1,4 +1,4 @@
-.PHONY: help prepare cookie external html serve clean
+.PHONY: help prepare cookie external html serve build-serve clean
 .DEFAULT_GOAL := help
 
 # Add help text after each target name starting with '\#\#'
@@ -18,17 +18,23 @@ cookie:
 
 external: cookie
 
-html: ## Build learn site (without external content) in `./public`
+html: ## Build learn site in `./content/_build/html`
 html: prepare
-	hugo
+	(cd content && myst build --html)
 
-html-all: ## Buildlearn site (with external content) in `./public`
-html-all: html external
+html-all: ## Build learn site with external content in `./public`
+html-all: html
+	mkdir -p public && cp -r content/_build/html/. public/
+	$(MAKE) external
 
-serve: ## Serve site, typically on http://localhost:1313
+serve: ## Serve site, typically on http://localhost:3000
 serve: prepare
-	@hugo --printI18nWarnings server
+	(cd content && myst start)
+
+build-serve: ## Build full site (learn + cookie) and serve `./public` at http://localhost:3000
+build-serve: html-all
+	python3 scripts/serve.py 3000 public
 
 clean: ## Remove built files
 clean:
-	rm -rf public
+	rm -rf content/_build public
diff --git a/README.md b/README.md
@@ -1 +1,43 @@
 # learn.scientific-python.org
+
+Source for [learn.scientific-python.org](https://learn.scientific-python.org),
+built with [MyST-MD](https://mystmd.org/) (the `mystmd` CLI).
+
+## Layout
+
+- `content/` — the MyST source project (`myst.yml` lives here). This is the
+  main site.
+- `external-content/cookie/` — the [cookie](https://github.com/scientific-python/cookie)
+  submodule, a separate MyST site. Its build is overlaid at `/development/`.
+- `public/` — build output. The merged, deployable static site (main +
+  cookie). Written by `make html-all`; published by Netlify.
+
+## Prerequisites
+
+- **mystmd** — the `myst` CLI. See the
+  [MyST install guide](https://mystmd.org/guide/quickstart).
+- **Node** — the cookie overlay builds via `npx mystmd`, so a full build needs
+  Node available.
+- **git** — the cookie content is a submodule; `make prepare` initializes it.
+
+## Local development
+
+| Command            | What it does                                                            |
+| ------------------ | ----------------------------------------------------------------------- |
+| `make serve`       | Live-reload dev server for the **main site only**, at `localhost:3000`. |
+| `make html`        | Build the main site to `content/_build/html/`.                          |
+| `make html-all`    | Build main + cookie, merged into `public/`.                             |
+| `make build-serve` | Run `html-all`, then serve the full merged site at `localhost:3000`.    |
+| `make clean`       | Remove build output (`content/_build`, `public/`).                      |
+
+**Previewing `/development/` (cookie) locally:** `make serve` (and `myst start`)
+serve `content/` only — the cookie overlay is **not** visible there. To preview
+the full site, including `/development/`, use `make build-serve`. It is a static
+build (no live reload); rerun it after edits.
+
+## Decisions
+
+Architecture decisions are recorded in
+[`docs/decisions/`](docs/decisions/). See
+[`0001-myst-migration/`](docs/decisions/0001-myst-migration/) for the
+Hugo → MyST migration.
diff --git a/assets/css/custom.css b/assets/css/custom.css
diff --git a/config.yaml b/config.yaml
diff --git a/content/.copier-answers.yml b/content/.copier-answers.yml
@@ -0,0 +1,6 @@
+# Changes here will be overwritten by Copier; NEVER EDIT MANUALLY
+_commit: e390239
+_src_path: gh:scientific-python/scientific-python-myst-theme
+favicon: https://raw.githubusercontent.com/scientific-python/scientific-python.org/main/static/favicon.ico
+project_name: Learn Scientific Python
+project_url: learn.scientific-python.org
diff --git a/content/about/_index.md → content/about/index.md b/content/about/_index.md → content/about/index.md
diff --git a/content/assets/css/scientific-python.css b/content/assets/css/scientific-python.css
@@ -0,0 +1,104 @@
+body {
+  display: flex;
+  flex-direction: column;
+  min-height: 100vh;
+}
+
+main {
+  min-height: 0;
+  flex: 1 0 auto;
+}
+
+.article.content {
+  /* Override 100vh from myst-theme:styles/typography.css so content div
+   * doesn't grow <main> to push the footer offscreen.
+   */
+  min-height: 0;
+}
+
+.footer {
+  /* Make footer "sticky" to page bottom (also the above flex rules), per
+   * the flexbox strategy described here:
+   *    https://css-tricks.com/couple-takes-sticky-footer/#aa-there-is-flexbox
+   * and here:
+   *    https://philipwalton.github.io/solved-by-flexbox/demos/sticky-footer/
+   * This solution does not require hardcoding a fixed footer height in the
+   * style rules.
+   */
+  flex-shrink: 0;
+  background: #013243;
+  color: white;
+  padding-left: 2rem;
+  padding-right: 2rem;
+
+  padding-left: 3.5rem;
+  padding-right: 3.5rem;
+
+  /* Outer content grid */
+  & .outer-grid {
+    /* spacer, project description, spacer, link columns, spacer */
+    grid-template-columns: 3fr 3fr 4fr;
+    align-items: center;
+    margin-bottom: 0rem;
+
+    & li {
+      list-style: none;
+    }
+  }
+
+  @media (max-width: 640px) {
+    & .outer-grid {
+      grid-template-columns: 1fr;
+      justify-items: start;
+    }
+  }
+
+  /* Heading colours */
+  & a,
+  h1,
+  h2,
+  h3,
+  h4,
+  h5,
+  h6 {
+    color: white;
+  }
+
+  & h1 {
+    font-size: 1.25rem;
+    font-weight: bold;
+  }
+}
+
+/* Hide download button */
+.myst-fm-downloads-button {
+  display: none;
+}
+
+/* Set site title bold */
+.myst-home-link {
+  font-weight: bold;
+}
+
+/* Unsure where this CSS came from, but keeping it for now */
+/* --- Make layout feel less "book-ish" and closer to a website --- */
+.bd-main .bd-content .bd-article-container {
+  max-width: 900px; /* keep readable, less wide than default "docs" feel */
+}
+
+h1,
+h2,
+h3,
+h4 {
+  letter-spacing: -0.01em;
+}
+
+/* Slightly tighten the top spacing so it feels more like a marketing/docs site */
+.bd-header {
+  box-shadow: none;
+}
+
+/* If the left sidebar feels too dominant, reduce its visual weight */
+.bd-sidebar-primary {
+  border-right: 0;
+}
diff --git a/content/assets/images/favicon.ico b/content/assets/images/favicon.ico
diff --git a/static/images/logo.svg → content/assets/images/logo.svg b/static/images/logo.svg → content/assets/images/logo.svg
diff --git a/content/community/_index.md → content/community/index.md b/content/community/_index.md → content/community/index.md
@@ -1,6 +1,5 @@
 ---
 title: "Community Guide"
-shortcutDepth: 2
 ---
 
 Welcome to the Community Managers Guide! Here you will find useful resources that will help you foster your community better.

diff --git a/content/community/onboarding.md b/content/community/onboarding.md
@@ -2,9 +2,9 @@
 title: "Onboarding"
 ---
 
-{{< admonition warning >}}
+:::{warning}
 This is a draft document.
-{{< /admonition >}}
+:::
 
 - Organizing sprints
   - Organising sprints are an excellent way to invite new collaborators, solve issues, gather contributions and broaden the project community. Some helpful tips for organising a sprint efficiently:

diff --git a/content/config/scientific-python.yml b/content/config/scientific-python.yml
@@ -0,0 +1,13 @@
+version: 1
+
+site:
+  template: book-theme
+  parts:
+    primary_sidebar_footer: sidebar-footer.md
+    footer: footer.md
+  options:
+    style: assets/css/scientific-python.css
+    hide_toc: true
+    hide_footer_links: true
+    folders: true
+    hide_myst_branding: true
diff --git a/content/contributors/_index.md b/content/contributors/_index.md