Enforce style module import rule in skill and sync guard

scripts/sync_styleguide_to_webapp_aktienberater.sh

@@ -90,8 +90,36 @@ flatten_css() {
   done < "$source_file"
 }
 
+assert_no_unimported_styles() {
+  local source_file="$1"
+  local source_root="$2"
+  local styles_dir="$source_root/styles"
+  local missing_imports=()
+
+  if [[ ! -d "$styles_dir" ]]; then
+    return 0
+  fi
+
+  while IFS= read -r css_file; do
+    local rel_path="./styles/$(basename "$css_file")"
+    if ! grep -Eq "^[[:space:]]*@import[[:space:]]+\"$rel_path\"[[:space:]]*;" "$source_file"; then
+      missing_imports+=("$rel_path")
+    fi
+  done < <(find "$styles_dir" -maxdepth 1 -type f -name '*.css' | sort)
+
+  if [[ ${#missing_imports[@]} -gt 0 ]]; then
+    echo "Unimported CSS module files detected in styles/:" >&2
+    for file in "${missing_imports[@]}"; do
+      echo "  - $file" >&2
+    done
+    echo "Add missing @import lines in $source_file before syncing." >&2
+    exit 1
+  fi
+}
+
 TMP_UPSTREAM_CSS="$(mktemp)"
 trap 'rm -f "$TMP_UPSTREAM_CSS"' EXIT
+assert_no_unimported_styles "$SOURCE_CSS" "$STYLEGUIDE_REPO_ROOT"
 flatten_css "$SOURCE_CSS" "$STYLEGUIDE_REPO_ROOT" "$TMP_UPSTREAM_CSS"
 cp "$TMP_UPSTREAM_CSS" "$PORTAL_CSS_PATH"