diff --git a/.prettierignore b/.prettierignore
index 23d67fc..7c80f3e 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -1,2 +1,25 @@
 node_modules/
 yarn.lock
+
+# Site content. Measured, not assumed: formatting content/_index.md
+# re-wrapped one list item, and the rendered public/index.html changed
+# with it - the wrap landed as a literal newline between "7 PM at" and
+# the following <a> tag. HTML collapses that newline to a space, so the
+# page looks the same, but the published bytes are not the same, and
+# this content carries raw HTML blocks (div/span/br) that goldmark
+# passes through verbatim because hugo.toml sets
+# markup.goldmark.renderer.unsafe = true. A formatter that can silently
+# change a published page is not worth the consistency, so content/ is
+# formatted by hand.
+content/
+
+# Hugo layout templates. REPO_POLICIES.md puts HTML in prettier's
+# scope, but these files are not HTML: they are Go templates carrying
+# {{ define }}, {{ block }}, {{ .Content }} and
+# {{ readFile ... | safeCSS }}. Prettier has no Go-template parser, so
+# it would either fail outright or reflow the delimiters into markup
+# Hugo can no longer parse. Formatting them would require an
+# out-of-tree prettier plugin, which in turn requires a package.json -
+# deliberately out of scope for this repo. Excluded on purpose, not by
+# oversight.
+themes/loravega/layouts/
diff --git a/TODO.md b/TODO.md
index 34f8f9f..49a36ba 100644
--- a/TODO.md
+++ b/TODO.md
@@ -28,6 +28,25 @@ remaining policy scaffold is otherwise complete.
 
 # Completed Steps
 
+- 2026-08-09: widened the prettier gate from top-level markdown to `'**/*.md'`
+  and `'**/*.css'` (closes #12). `themes/loravega/static/css/style.css` was
+  never formatted or gated even though it is inlined into every page; it is now
+  both, and the reformat landed as its own commit ahead of the script change so
+  no commit in the branch is red. `content/` is excluded in `.prettierignore`,
+  and that exclusion is measured rather than assumed: with `content/` in scope,
+  prettier re-wrapped one list item in `content/_index.md` and the rendered
+  `public/index.html` changed with it (the wrap became a literal newline between
+  `7 PM at` and the following `<a>`). HTML collapses that newline to a space so
+  the page looks identical, but the published bytes are not, and this content
+  carries raw HTML that goldmark passes through verbatim under `unsafe = true`.
+  `themes/loravega/layouts/` is excluded too, with the reason recorded: those
+  files are Go templates, not HTML, and prettier has no parser for `{{ ... }}` —
+  covering them would need a plugin and therefore a `package.json`. Verified by
+  extracting `public/` from the built image before and after: with the final
+  scope, `index.html`, `index.xml` and `sitemap.xml` are byte-identical and only
+  the verbatim-copied `public/css/style.css` changes, in whitespace only — the
+  minified `<style>` block inlined into `index.html` is unchanged, which is the
+  direct evidence that CSS formatting cannot reach the rendered page
 - 2026-08-09: added the canonical policy dotfiles and hardened both ignore files
   (closes #8). `REPO_POLICIES.md` is a byte-identical copy of the canonical
   `prompts` file, front matter intact; `.editorconfig`, `.prettierrc` and
diff --git a/script/fmt b/script/fmt
index b0ffb97..0e1d5b2 100755
--- a/script/fmt
+++ b/script/fmt
@@ -1,8 +1,11 @@
 #!/bin/sh
-# script/fmt: format the repo's own top-level markdown docs (README.md,
-# TODO.md, ...) with prettier, using our standard settings. Scope is
-# deliberately limited to top-level docs: site content under content/
-# is left untouched so rendered output cannot change.
+# script/fmt: format this repo's markdown and CSS with prettier, using
+# our standard settings. Scope is every markdown and CSS file in the
+# tree, per REPO_POLICIES.md ("prettier for JS/CSS/Markdown/HTML").
+# What is deliberately NOT covered is recorded in .prettierignore, with
+# the reason next to each entry: the Hugo layout templates, which are
+# Go templates and not HTML, and content/, whose reformatting was
+# measured to change the rendered page.
 set -eu
 
 ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
@@ -12,7 +15,7 @@ PRETTIER_VERSION="3.4.2"
 main() {
     cd "$ROOT"
     npx --yes "prettier@${PRETTIER_VERSION}" --write \
-        '*.md' --tab-width 4 --prose-wrap always
+        '**/*.md' '**/*.css' --tab-width 4 --prose-wrap always
 }
 
 main "$@"
diff --git a/script/fmt-check b/script/fmt-check
index f696312..3af9cb0 100755
--- a/script/fmt-check
+++ b/script/fmt-check
@@ -1,7 +1,7 @@
 #!/bin/sh
-# script/fmt-check: check the formatting of the repo's own top-level
-# markdown docs (read-only). Same scope as script/fmt, but fails
-# instead of writing.
+# script/fmt-check: check the formatting of this repo's markdown and
+# CSS (read-only). Same scope and same settings as script/fmt - keep
+# the two in sync - but fails instead of writing.
 set -eu
 
 ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
@@ -11,7 +11,7 @@ PRETTIER_VERSION="3.4.2"
 main() {
     cd "$ROOT"
     npx --yes "prettier@${PRETTIER_VERSION}" --check \
-        '*.md' --tab-width 4 --prose-wrap always
+        '**/*.md' '**/*.css' --tab-width 4 --prose-wrap always
 }
 
 main "$@"