diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 021779f02..0248da707 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -6,15 +6,32 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+
   linux:
+
     name: Static linting
     runs-on: ubuntu-24.04
     env:
       CLICOLOR_FORCE: "1"
 
     steps:
+
+    - name: Checkout
+      uses: actions/checkout@v4
+      with:
+          clean: false
+          show-progress: false
+
+    - name: Setup Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: 'latest'
+        # No cache, there are complaints about lockfiles that we don't want otherwise. See <https://github.com/actions/setup-node/issues/928>.
+        # cache: 'npm'
+
     - name: Install prerequisites
       run: |
+        set -ex
         packages=(
           clang-tidy
           cppcheck
@@ -33,26 +50,9 @@ jobs:
         # We need a more recent version of libunibreak for `lb_get_char_class` support.
         wget http://ftp.debian.org/debian/pool/main/libu/libunibreak/libunibreak{6,-dev}_6.1-2_amd64.deb
         sudo dpkg -i *.deb
-
-    - name: Checkout
-      uses: actions/checkout@v4
-      with:
-          clean: false
-          show-progress: false
+        # Install stylelint.
+        npm init --yes
+        npm install stylelint stylelint-config-standard
 
     - name: Lint
       run: ./utils/lint.sh 2>&1
-
-    # NPM tests
-
-    - name: Uses Node.js
-      uses: actions/setup-node@v4
-      with:
-        node-version: 'latest'
-        # No cache, there are complaints about lockfiles that we don't want otherwise. See <https://github.com/actions/setup-node/issues/928>.
-        # cache: 'npm'
-
-    - run: npm init --yes && npm install stylelint stylelint-config-standard
-
-    - name: Check CSS syntax (only epub.css, html5.css and fb2.css)
-      run: npx stylelint cr3gui/data/epub.css cr3gui/data/html5.css cr3gui/data/fb2.css
diff --git a/utils/lint.mk b/utils/lint.mk
index cd2dfffe7..d71e6318d 100644
--- a/utils/lint.mk
+++ b/utils/lint.mk
@@ -98,6 +98,16 @@ endef
 
 # }}}
 
+# CSS files. {{{
+
+define CSS_FILES
+cr3gui/data/epub.css
+cr3gui/data/html5.css
+cr3gui/data/fb2.css
+endef
+
+# }}}
+
 # Hyphenation patterns. {{{
 
 HYPH_DIR := cr3gui/data/hyph
@@ -281,6 +291,19 @@ endef
 
 # }}}
 
+# Stylelint. {{{
+
+define STYLELINT_FLAGS
+$(if $(CLICOLOR_FORCE),--color)
+--formatter=$(if $(GITHUB_ACTIONS),github,unix)
+endef
+
+define stylelint_rule
+$(call lint_rule,stylelint,$1,$(ci_time) npx stylelint $(strip $(STYLELINT_FLAGS) $1))
+endef
+
+# }}}
+
 # XmlLint. {{{
 
 define xmllint_rule
@@ -290,17 +313,20 @@ endef
 # }}}
 
 CPPFILES := $(filter %.c %.cpp,$(sort $(CPPFILES) $(filter-out cppcheck-% clang-tidy-%,$(MAKECMDGOALS))))
+CSS_FILES := $(filter %.css, $(sort $(CSS_FILES) $(filter-out stylelint-%,$(MAKECMDGOALS))))
 HYPH_PATTERNS := $(filter %.pattern,$(sort $(HYPH_PATTERNS) $(filter-out xmllint-%,$(MAKECMDGOALS))))
 
-lint: $(CPPFILES) $(HYPH_LANGUAGES) $(HYPH_PATTERNS)
+lint: $(CPPFILES) $(CSS_FILES) $(HYPH_LANGUAGES) $(HYPH_PATTERNS)
 
 cpp: $(CPPFILES)
 
 hyph: $(HYPH_LANGUAGES) $(HYPH_PATTERNS)
 
+style: $(CSS_FILES)
+
 # Avoid "Nothing to be done for '…'"
 # or "'…' is up to date messages".
-$(CPPFILES) $(HYPH_PATTERNS):
+$(CPPFILES) $(CSS_FILES) $(HYPH_PATTERNS):
 	@:
 
 .PHONY: $(HYPH_LANGUAGES)
@@ -310,6 +336,10 @@ $(foreach f,$(CPPFILES),\
 	$(eval $(call cppcheck_rule,$f))\
 	)
 
+$(foreach f,$(CSS_FILES),\
+	$(eval $(call stylelint_rule,$f))\
+	)
+
 $(eval $(call lint_rule,check,$(HYPH_LANGUAGES),$(check_languages.json)))
 
 $(foreach f,$(HYPH_PATTERNS),\