diff --git a/roux-server.cabal b/roux-server.cabal
index d08a592..c7869ea 100644
--- a/roux-server.cabal
+++ b/roux-server.cabal
@@ -16,6 +16,7 @@ build-type:     Simple
 
 library
   exposed-modules:
+      Data.CookLang
       Roux
       Roux.Html
       Roux.NYTimes
diff --git a/src/Data/CookLang.hs b/src/Data/CookLang.hs
new file mode 100644
index 0000000..886ec83
--- /dev/null
+++ b/src/Data/CookLang.hs
@@ -0,0 +1,239 @@
+{- | Data types for the Cooklang recipe markup language.
+
+Models the structure of a parsed @.cook@ recipe file as specified at
+<https://cooklang.org/docs/spec/>.  This module has no dependencies on
+Roux-specific modules and can be extracted to its own package.
+
+Hierarchy:
+
+@
+Recipe
+  Metadata                  — YAML front matter (title, tags, servings, …)
+  NonEmpty Section           — at least one section per recipe
+
+Section
+  Maybe Text                 — optional section name ("Dough", "Filling")
+  NonEmpty SectionBodyItem   — interleaved steps, comments, and notes
+
+SectionBodyItem
+  SecStep Step               — a cooking step (paragraph)
+  SecComment Text            — full-line @--@ comment
+  SecNote Text               — @>@ note / commentary
+
+Step
+  [StepItem]
+
+StepItem
+  StepText              — plain text
+  StepIngredient        — \@name{amount%unit}(preparation)
+  StepCookware          — \#name{}
+  StepTimer             — \~name{duration%unit}
+  StepRecipeRef         — \@.\/path\/to\/recipe{amount}
+  StepEndComment        — @-- end of line comment@
+  StepComment           — @[- block comment -]@
+  StepBreak             — \\ at end of line
+@
+-}
+module Data.CookLang (
+    -- * Recipe
+    Recipe (..),
+
+    -- * Sections and body items
+    Section (..),
+    SectionBodyItem (..),
+    Step (..),
+
+    -- * Inline elements
+    StepItem (..),
+    Ingredient (..),
+    Cookware (..),
+    Timer (..),
+    RecipeRef (..),
+
+    -- * Quantities and durations
+    Quantity (..),
+    Duration (..),
+
+    -- * Metadata
+    Metadata (..),
+    emptyMetadata,
+) where
+
+import Data.List.NonEmpty (NonEmpty)
+import Data.Map.Strict (Map)
+import qualified Data.Map.Strict as Map
+import Data.Text (Text)
+
+-- ---------------------------------------------------------------------------
+-- Top-level
+-- ---------------------------------------------------------------------------
+
+-- | A fully parsed Cooklang recipe file.
+data Recipe = Recipe
+    { recipeMetadata :: !Metadata
+    , recipeSections :: !(NonEmpty Section)
+    }
+    deriving stock (Eq, Show)
+
+-- ---------------------------------------------------------------------------
+-- Sections and body items
+-- ---------------------------------------------------------------------------
+
+{- | A named or unnamed section within a recipe.  Each section contains
+interleaved steps, full-line comments, and notes.
+-}
+data Section = Section
+    { sectionName :: !(Maybe Text)
+    , sectionBody :: !(NonEmpty SectionBodyItem)
+    }
+    deriving stock (Eq, Show)
+
+-- | An item that appears at the top-level of a section (between blank lines).
+data SectionBodyItem
+    = SecStep !Step
+    | SecComment !Text
+    | SecNote !Text
+    deriving stock (Eq, Show)
+
+{- | A single cooking step — one paragraph of text in the Cooklang file,
+separated from other steps by a blank line.
+-}
+newtype Step = Step
+    { unStep :: [StepItem]
+    }
+    deriving stock (Eq, Show)
+
+-- ---------------------------------------------------------------------------
+-- Inline elements
+-- ---------------------------------------------------------------------------
+
+-- | An element that appears within a step.
+data StepItem
+    = StepText !Text
+    | StepIngredient !Ingredient
+    | StepCookware !Cookware
+    | StepTimer !Timer
+    | StepRecipeRef !RecipeRef
+    | StepEndComment !Text
+    | StepComment !Text
+    | StepBreak
+    deriving stock (Eq, Show)
+
+{- | An ingredient reference.
+
+@\@salt\@ground black pepper{}\@potato{2}\@bacon strips{1%kg}@
+-}
+data Ingredient = Ingredient
+    { ingName :: !Text
+    , ingQuantity :: !(Maybe Quantity)
+    , ingPreparation :: !(Maybe Text)
+    }
+    deriving stock (Eq, Show)
+
+{- | A piece of cookware.
+
+@\#pot\#potato masher{}@
+-}
+newtype Cookware = Cookware
+    { cwName :: Text
+    }
+    deriving stock (Eq, Show)
+
+{- | A timer.
+
+@\{25%minutes\}\~eggs{3%minutes}@
+-}
+data Timer = Timer
+    { timerName :: !(Maybe Text)
+    , timerDuration :: !Duration
+    }
+    deriving stock (Eq, Show)
+
+{- | A reference to another recipe, signalled by a path starting with @.\/@.
+
+@\@.\/sauces\/Hollandaise{150%g}@
+-}
+data RecipeRef = RecipeRef
+    { refPath :: !FilePath
+    , refQuantity :: !(Maybe Quantity)
+    }
+    deriving stock (Eq, Show)
+
+-- ---------------------------------------------------------------------------
+-- Quantities and durations
+-- ---------------------------------------------------------------------------
+
+{- | An ingredient quantity with optional unit and scaling lock.
+
+@{2}\{1%kg}\{1\/2%tbsp}\{=1%tsp}@
+-}
+data Quantity = Quantity
+    { quantityAmount :: !Rational
+    -- ^ e.g. @1\/2@, @3@, @3\/4@
+    , quantityUnit :: !(Maybe Text)
+    -- ^ e.g. @\"kg\"@, @\"tbsp\"@
+    , quantityFixed :: !Bool
+    -- ^ @{=1%tsp}@ — locked from scaling
+    }
+    deriving stock (Eq, Show)
+
+{- | A timer duration — structurally similar to 'Quantity' but semantically
+distinct.  Timers are not scaled with serving size.
+-}
+data Duration = Duration
+    { durationAmount :: !Rational
+    -- ^ e.g. @25@, @3@
+    , durationUnit :: !(Maybe Text)
+    -- ^ e.g. @\"minutes\"@, @\"hours\"@
+    }
+    deriving stock (Eq, Show)
+
+-- ---------------------------------------------------------------------------
+-- Metadata
+-- ---------------------------------------------------------------------------
+
+{- | Metadata parsed from YAML front matter (the @---@ … @---@ block at the
+top of a @.cook@ file).
+
+Canonical metadata keys are lifted to dedicated fields; everything else
+lives in 'metaCustom'.
+-}
+data Metadata = Metadata
+    { metaTitle :: !(Maybe Text)
+    , metaServings :: !(Maybe (Int, Maybe Text))
+    , metaAuthor :: !(Maybe Text)
+    , metaSource :: !(Maybe Text)
+    , metaTotalTime :: !(Maybe Duration)
+    , metaPrepTime :: !(Maybe Duration)
+    , metaCookTime :: !(Maybe Duration)
+    , metaDifficulty :: !(Maybe Text)
+    , metaCuisine :: !(Maybe Text)
+    , metaCourse :: !(Maybe Text)
+    , metaDiet :: ![Text]
+    , metaTags :: ![Text]
+    , metaImage :: !(Maybe Text)
+    , metaDescription :: !(Maybe Text)
+    , metaCustom :: !(Map Text Text)
+    }
+    deriving stock (Eq, Show)
+
+-- | Metadata with all fields set to their default / empty values.
+emptyMetadata :: Metadata
+emptyMetadata =
+    Metadata
+        { metaTitle = Nothing
+        , metaServings = Nothing
+        , metaAuthor = Nothing
+        , metaSource = Nothing
+        , metaTotalTime = Nothing
+        , metaPrepTime = Nothing
+        , metaCookTime = Nothing
+        , metaDifficulty = Nothing
+        , metaCuisine = Nothing
+        , metaCourse = Nothing
+        , metaDiet = []
+        , metaTags = []
+        , metaImage = Nothing
+        , metaDescription = Nothing
+        , metaCustom = Map.empty
+        }
diff --git a/src/Roux.hs b/src/Roux.hs
index 3ce3766..792fd66 100644
--- a/src/Roux.hs
+++ b/src/Roux.hs
@@ -5,4 +5,4 @@ module Roux (
 ) where
 
 import Roux.Server (app)
-import Roux.Types as X
+import Data.CookLang as X
diff --git a/src/Roux/Html.hs b/src/Roux/Html.hs
index 06db893..f2a6b77 100644
--- a/src/Roux/Html.hs
+++ b/src/Roux/Html.hs
@@ -29,7 +29,7 @@ import Text.Blaze.Html5 as H
 import Text.Blaze.Html5.Attributes as A
 
 import qualified Roux.RecipeIndex as Idx
-import Roux.Types
+import Data.CookLang
 
 -- ---------------------------------------------------------------------------
 -- Sort mode for the index page
diff --git a/src/Roux/Parser.hs b/src/Roux/Parser.hs
index 4554f90..c8e2f85 100644
--- a/src/Roux/Parser.hs
+++ b/src/Roux/Parser.hs
@@ -18,7 +18,7 @@ import qualified Data.Text as T
 import qualified Text.Parsec as P
 import Text.Parsec.Text (Parser)
 
-import Roux.Types
+import Data.CookLang
 
 -- ---------------------------------------------------------------------------
 -- Internal raw-block types (parser only)
diff --git a/src/Roux/RecipeIndex.hs b/src/Roux/RecipeIndex.hs
index 78753f4..3ac4904 100644
--- a/src/Roux/RecipeIndex.hs
+++ b/src/Roux/RecipeIndex.hs
@@ -10,7 +10,7 @@ import System.Directory (listDirectory)
 import System.FilePath (takeBaseName, takeExtension, (</>))
 
 import Roux.Parser (parseCookFile)
-import Roux.Types
+import Data.CookLang
 
 -- | Metadata about a single recipe discovered on disk.
 data RecipeInfo = RecipeInfo
diff --git a/src/Roux/Types.hs b/src/Roux/Types.hs
index 0bd1100..e175cfa 100644
--- a/src/Roux/Types.hs
+++ b/src/Roux/Types.hs
@@ -1,236 +1,5 @@
-{- | Core types for Roux.  Models the structure of a parsed Cooklang (.cook)
-recipe file as specified at <https://cooklang.org/docs/spec/>.
-
-Hierarchy:
-
-@
-Recipe
-  Metadata                  — YAML front matter (title, tags, servings, …)
-  NonEmpty Section           — at least one section per recipe
-
-Section
-  Maybe Text                 — optional section name ("Dough", "Filling")
-  NonEmpty SectionBodyItem   — interleaved steps, comments, and notes
-
-SectionBodyItem
-  SecStep Step               — a cooking step (paragraph)
-  SecComment Text            — full-line @--@ comment
-  SecNote Text               — @>@ note / commentary
-
-Step
-  [StepItem]
-
-StepItem
-  StepText              — plain text
-  StepIngredient        — \@name{amount%unit}(preparation)
-  StepCookware          — \#name{}
-  StepTimer             — \~name{duration%unit}
-  StepRecipeRef         — \@.\/path\/to\/recipe{amount}
-  StepEndComment        — @-- end of line comment@
-  StepComment           — @[- block comment -]@
-  StepBreak             — \\ at end of line
-@
+{- | Re-exports all types from 'Data.CookLang' for backward compatibility.
 -}
-module Roux.Types (
-    -- * Recipe
-    Recipe (..),
+module Roux.Types (module X) where
 
-    -- * Sections and body items
-    Section (..),
-    SectionBodyItem (..),
-    Step (..),
-
-    -- * Inline elements
-    StepItem (..),
-    Ingredient (..),
-    Cookware (..),
-    Timer (..),
-    RecipeRef (..),
-
-    -- * Quantities and durations
-    Quantity (..),
-    Duration (..),
-
-    -- * Metadata
-    Metadata (..),
-    emptyMetadata,
-) where
-
-import Data.List.NonEmpty (NonEmpty)
-import Data.Map.Strict (Map)
-import qualified Data.Map.Strict as Map
-import Data.Text (Text)
-
--- ---------------------------------------------------------------------------
--- Top-level
--- ---------------------------------------------------------------------------
-
--- | A fully parsed Cooklang recipe file.
-data Recipe = Recipe
-    { recipeMetadata :: !Metadata
-    , recipeSections :: !(NonEmpty Section)
-    }
-    deriving stock (Eq, Show)
-
--- ---------------------------------------------------------------------------
--- Sections and body items
--- ---------------------------------------------------------------------------
-
-{- | A named or unnamed section within a recipe.  Each section contains
-interleaved steps, full-line comments, and notes.
--}
-data Section = Section
-    { sectionName :: !(Maybe Text)
-    , sectionBody :: !(NonEmpty SectionBodyItem)
-    }
-    deriving stock (Eq, Show)
-
--- | An item that appears at the top-level of a section (between blank lines).
-data SectionBodyItem
-    = SecStep !Step
-    | SecComment !Text
-    | SecNote !Text
-    deriving stock (Eq, Show)
-
-{- | A single cooking step — one paragraph of text in the Cooklang file,
-separated from other steps by a blank line.
--}
-newtype Step = Step
-    { unStep :: [StepItem]
-    }
-    deriving stock (Eq, Show)
-
--- ---------------------------------------------------------------------------
--- Inline elements
--- ---------------------------------------------------------------------------
-
--- | An element that appears within a step.
-data StepItem
-    = StepText !Text
-    | StepIngredient !Ingredient
-    | StepCookware !Cookware
-    | StepTimer !Timer
-    | StepRecipeRef !RecipeRef
-    | StepEndComment !Text
-    | StepComment !Text
-    | StepBreak
-    deriving stock (Eq, Show)
-
-{- | An ingredient reference.
-
-@\@salt\@ground black pepper{}\@potato{2}\@bacon strips{1%kg}@
--}
-data Ingredient = Ingredient
-    { ingName :: !Text
-    , ingQuantity :: !(Maybe Quantity)
-    , ingPreparation :: !(Maybe Text)
-    }
-    deriving stock (Eq, Show)
-
-{- | A piece of cookware.
-
-@\#pot\#potato masher{}@
--}
-newtype Cookware = Cookware
-    { cwName :: Text
-    }
-    deriving stock (Eq, Show)
-
-{- | A timer.
-
-@\{25%minutes\}\~eggs{3%minutes}@
--}
-data Timer = Timer
-    { timerName :: !(Maybe Text)
-    , timerDuration :: !Duration
-    }
-    deriving stock (Eq, Show)
-
-{- | A reference to another recipe, signalled by a path starting with @.\/@.
-
-@\@.\/sauces\/Hollandaise{150%g}@
--}
-data RecipeRef = RecipeRef
-    { refPath :: !FilePath
-    , refQuantity :: !(Maybe Quantity)
-    }
-    deriving stock (Eq, Show)
-
--- ---------------------------------------------------------------------------
--- Quantities and durations
--- ---------------------------------------------------------------------------
-
-{- | An ingredient quantity with optional unit and scaling lock.
-
-@{2}\{1%kg}\{1\/2%tbsp}\{=1%tsp}@
--}
-data Quantity = Quantity
-    { quantityAmount :: !Rational
-    -- ^ e.g. @1\/2@, @3@, @3\/4@
-    , quantityUnit :: !(Maybe Text)
-    -- ^ e.g. @\"kg\"@, @\"tbsp\"@
-    , quantityFixed :: !Bool
-    -- ^ @{=1%tsp}@ — locked from scaling
-    }
-    deriving stock (Eq, Show)
-
-{- | A timer duration — structurally similar to 'Quantity' but semantically
-distinct.  Timers are not scaled with serving size.
--}
-data Duration = Duration
-    { durationAmount :: !Rational
-    -- ^ e.g. @25@, @3@
-    , durationUnit :: !(Maybe Text)
-    -- ^ e.g. @\"minutes\"@, @\"hours\"@
-    }
-    deriving stock (Eq, Show)
-
--- ---------------------------------------------------------------------------
--- Metadata
--- ---------------------------------------------------------------------------
-
-{- | Metadata parsed from YAML front matter (the @---@ … @---@ block at the
-top of a @.cook@ file).
-
-Canonical metadata keys are lifted to dedicated fields; everything else
-lives in 'metaCustom'.
--}
-data Metadata = Metadata
-    { metaTitle :: !(Maybe Text)
-    , metaServings :: !(Maybe (Int, Maybe Text))
-    , metaAuthor :: !(Maybe Text)
-    , metaSource :: !(Maybe Text)
-    , metaTotalTime :: !(Maybe Duration)
-    , metaPrepTime :: !(Maybe Duration)
-    , metaCookTime :: !(Maybe Duration)
-    , metaDifficulty :: !(Maybe Text)
-    , metaCuisine :: !(Maybe Text)
-    , metaCourse :: !(Maybe Text)
-    , metaDiet :: ![Text]
-    , metaTags :: ![Text]
-    , metaImage :: !(Maybe Text)
-    , metaDescription :: !(Maybe Text)
-    , metaCustom :: !(Map Text Text)
-    }
-    deriving stock (Eq, Show)
-
--- | Metadata with all fields set to their default / empty values.
-emptyMetadata :: Metadata
-emptyMetadata =
-    Metadata
-        { metaTitle = Nothing
-        , metaServings = Nothing
-        , metaAuthor = Nothing
-        , metaSource = Nothing
-        , metaTotalTime = Nothing
-        , metaPrepTime = Nothing
-        , metaCookTime = Nothing
-        , metaDifficulty = Nothing
-        , metaCuisine = Nothing
-        , metaCourse = Nothing
-        , metaDiet = []
-        , metaTags = []
-        , metaImage = Nothing
-        , metaDescription = Nothing
-        , metaCustom = Map.empty
-        }
+import Data.CookLang as X
diff --git a/test/Roux/ParserSpec.hs b/test/Roux/ParserSpec.hs
index 26b48bb..9125dd2 100644
--- a/test/Roux/ParserSpec.hs
+++ b/test/Roux/ParserSpec.hs
@@ -7,7 +7,7 @@ import qualified Data.Text.IO as TIO
 import Test.Hspec (Spec, describe, expectationFailure, it, shouldBe)
 
 import Roux.Parser (parseCookFile)
-import Roux.Types
+import Data.CookLang
 
 spec :: Spec
 spec = do