diff --git a/docs/Concepts.md b/docs/Concepts.md
index e8f65ff..7badbc6 100644
--- a/docs/Concepts.md
+++ b/docs/Concepts.md
@@ -109,7 +109,6 @@ const presentationState = constructPresentationState(presentations);
 
 Presentation state includes:
 
-- `base`: Base layout/screen configuration
 - `background`: Current background or CG
 - `dialogue`: Speaker, text content, mode (ADV/NVL)
 - `character`: Character sprites and positions
diff --git a/docs/RouteEngine.md b/docs/RouteEngine.md
index 7191518..4472b44 100644
--- a/docs/RouteEngine.md
+++ b/docs/RouteEngine.md
@@ -420,7 +420,6 @@ Actions that can be attached to lines to control presentation:
 
 | Action       | Properties                                                  | Description                                                                                       |
 | ------------ | ----------------------------------------------------------- | ------------------------------------------------------------------------------------------------- |
-| `base`       | `{ resourceId }`                                            | Set base layout                                                                                   |
 | `background` | `{ resourceId, animations? }`                               | Set background/CG                                                                                 |
 | `dialogue`   | `{ characterId?, character?, content, mode?, ui?, clear? }` | Display dialogue                                                                                  |
 | `character`  | `{ items }`                                                 | Display character sprites. Each item can have optional `x` and `y` to override transform position |
diff --git a/package.json b/package.json
index ba41ec8..2b560a0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "route-engine-js",
-  "version": "0.3.0",
+  "version": "0.3.1",
   "description": "A lightweight Visual Novel engine built in JavaScript for creating interactive narrative games with branching storylines",
   "repository": {
     "type": "git",
diff --git a/spec/system/constructPresentationState.spec.yaml b/spec/system/constructPresentationState.spec.yaml
index fc5b329..e41faa1 100644
--- a/spec/system/constructPresentationState.spec.yaml
+++ b/spec/system/constructPresentationState.spec.yaml
@@ -5,13 +5,13 @@ suites: [constructPresentationState]
 suite: constructPresentationState
 exportName: constructPresentationState
 ---
-case: construct presentation state with single base action
+case: construct presentation state with single background action
 in:
-  - - base:
-        resourceId: "mainBase"
+  - - background:
+        resourceId: "mainBackground"
 out:
-  base:
-    resourceId: "mainBase"
+  background:
+    resourceId: "mainBackground"
 ---
 case: construct presentation state with control action
 in:
@@ -39,16 +39,12 @@ out:
 ---
 case: construct presentation state with multiple actions in one presentation
 in:
-  - - base:
-        resourceId: "mainBase"
-      background:
+  - - background:
         resourceId: "bgImage"
       bgm:
         resourceId: "backgroundMusic"
         loop: true
 out:
-  base:
-    resourceId: "mainBase"
   background:
     resourceId: "bgImage"
   bgm:
@@ -58,15 +54,11 @@ out:
 case: construct presentation state with clean all and multiple presentations
 in:
   - - cleanAll: true
-      base:
-        resourceId: "oldBase"
-    - base:
-        resourceId: "newBase"
       background:
+        resourceId: "oldBg"
+    - background:
         resourceId: "newBg"
 out:
-  base:
-    resourceId: "newBase"
   background:
     resourceId: "newBg"
 ---
diff --git a/spec/system/constructRenderState.spec.yaml b/spec/system/constructRenderState.spec.yaml
index a577fd4..2fd9bbe 100644
--- a/spec/system/constructRenderState.spec.yaml
+++ b/spec/system/constructRenderState.spec.yaml
@@ -5,17 +5,17 @@ suites: [constructRenderState]
 suite: constructRenderState
 exportName: constructRenderState
 ---
-case: construct render state with single base action
+case: construct render state with single background layout action
 in:
   - - presentationState:
-        base:
-          resourceId: "mainBase"
+        background:
+          resourceId: "mainBackground"
       resources:
         layouts:
-          mainBase:
+          mainBackground:
             elements:
               - type: "container"
-                id: "base-container"
+                id: "background-container"
 out:
   elements:
     - id: "story"
@@ -23,33 +23,44 @@ out:
       x: 0
       y: 0
       children:
-        - id: "base"
+        - id: "bg-cg-mainBackground"
           type: "container"
           children:
             - type: "container"
-              id: "base-container"
+              id: "background-container"
   animations: []
   audio: []
   global: {}
 ---
-case: construct render state with multiple actions in one presentation
+case: construct render state keeps controls behind background and layout
 in:
   - - presentationState:
-        base:
-          resourceId: "mainBase"
+        control:
+          resourceId: "gameplay"
         background:
           resourceId: "bgImage"
+        layout:
+          resourceId: "foregroundLayout"
       resources:
-        layouts:
-          mainBase:
-            elements:
-              - type: "container"
-                id: "base-container"
         images:
           bgImage:
             fileId: "background.jpg"
             width: 1920
             height: 1080
+        controls:
+          gameplay:
+            elements:
+              - id: "control-hitbox"
+                type: "rect"
+                x: 0
+                y: 0
+                width: 100
+                height: 100
+        layouts:
+          foregroundLayout:
+            elements:
+              - type: "container"
+                id: "foreground-container"
 out:
   elements:
     - id: "story"
@@ -57,11 +68,17 @@ out:
       x: 0
       y: 0
       children:
-        - id: "base"
+        - id: "control-gameplay"
           type: "container"
+          x: 0
+          y: 0
           children:
-            - type: "container"
-              id: "base-container"
+            - id: "control-hitbox"
+              type: "rect"
+              x: 0
+              y: 0
+              width: 100
+              height: 100
         - id: "bg-cg-bgImage"
           type: "sprite"
           x: 0
@@ -69,6 +86,13 @@ out:
           src: "background.jpg"
           width: 1920
           height: 1080
+        - id: "layout-foregroundLayout"
+          type: "container"
+          x: 0
+          y: 0
+          children:
+            - type: "container"
+              id: "foreground-container"
   animations: []
   audio: []
   global: {}
@@ -77,25 +101,18 @@ case: construct render state with clean all and multiple presentations
 in:
   - - presentationState:
         cleanAll: true
-        base:
-          resourceId: "oldBase"
+        background:
+          resourceId: "oldBg"
       resources:
         layouts:
-          oldBase:
+          oldBg:
             elements:
               - type: "container"
                 id: "old-container"
     - presentationState:
-        base:
-          resourceId: "newBase"
         background:
           resourceId: "newBg"
       resources:
-        layouts:
-          newBase:
-            elements:
-              - type: "container"
-                id: "new-container"
         images:
           newBg:
             fileId: "new-background.jpg"
@@ -108,12 +125,7 @@ out:
       x: 0
       y: 0
       children:
-        - id: "base"
-          type: "container"
-          children:
-            - type: "container"
-              id: "new-container"
-        - id: "base"
+        - id: "bg-cg-oldBg"
           type: "container"
           children:
             - type: "container"
@@ -127,4 +139,4 @@ out:
           height: 1080
   animations: []
   audio: []
-  global: {}
\ No newline at end of file
+  global: {}
diff --git a/spec/system/renderState/addBase.spec.yaml b/spec/system/renderState/addBase.spec.yaml
deleted file mode 100644
index e9e0bca..0000000
--- a/spec/system/renderState/addBase.spec.yaml
+++ /dev/null
@@ -1,558 +0,0 @@
-file: "../../../src/stores/constructRenderState.js"
-group: constructRenderState.addBase
-suites: [addBase]
----
-suite: addBase
-exportName: addBase
----
-case: add base container as first child of story container
-in:
-  - elements:
-      - id: "story"
-        type: "container"
-        x: 0
-        y: 0
-        children: []
-    animations: []
-  - presentationState:
-      base:
-        resourceId: "mainBase"
-    resources:
-      layouts:
-        mainBase:
-          elements:
-            - id: "baseElement1"
-              type: "text"
-              content: "Hello"
-out:
-  elements:
-    - id: "story"
-      type: "container"
-      x: 0
-      y: 0
-      children:
-        - id: "base"
-          type: "container"
-          children:
-            - id: "baseElement1"
-              type: "text"
-              content: "Hello"
-  animations: []
----
-case: prepend base container before existing children
-in:
-  - elements:
-      - id: "story"
-        type: "container"
-        x: 0
-        y: 0
-        children:
-          - id: "existingChild1"
-            type: "text"
-          - id: "existingChild2"
-            type: "container"
-    animations: []
-  - presentationState:
-      base:
-        resourceId: "newBase"
-    resources:
-      layouts:
-        newBase:
-          elements:
-            - id: "baseElement"
-              type: "sprite"
-out:
-  elements:
-    - id: "story"
-      type: "container"
-      x: 0
-      y: 0
-      children:
-        - id: "base"
-          type: "container"
-          children:
-            - id: "baseElement"
-              type: "sprite"
-        - id: "existingChild1"
-          type: "text"
-        - id: "existingChild2"
-          type: "container"
-  animations: []
----
-case: handle complex layout elements with nested children
-in:
-  - elements:
-      - id: "story"
-        type: "container"
-        x: 0
-        y: 0
-        children: []
-    animations: []
-  - presentationState:
-      base:
-        resourceId: "complexBase"
-    resources:
-      layouts:
-        complexBase:
-          elements:
-            - id: "container1"
-              type: "container"
-              children:
-                - id: "nested1"
-                  type: "text"
-                - id: "nested2"
-                  type: "sprite"
-            - id: "standalone"
-              type: "image"
-out:
-  elements:
-    - id: "story"
-      type: "container"
-      x: 0
-      y: 0
-      children:
-        - id: "base"
-          type: "container"
-          children:
-            - id: "container1"
-              type: "container"
-              children:
-                - id: "nested1"
-                  type: "text"
-                - id: "nested2"
-                  type: "sprite"
-            - id: "standalone"
-              type: "image"
-  animations: []
----
-case: no presentationState.base - return unchanged state
-in:
-  - elements:
-      - id: "story"
-        type: "container"
-        x: 0
-        y: 0
-        children: []
-    animations: []
-  - presentationState: {}
-    resources:
-      layouts:
-        mainBase:
-          elements: []
-out:
-  elements:
-    - id: "story"
-      type: "container"
-      x: 0
-      y: 0
-      children: []
-  animations: []
----
-case: missing resourceId in presentationState.base - return unchanged state
-in:
-  - elements:
-      - id: "story"
-        type: "container"
-        x: 0
-        y: 0
-        children: []
-    animations: []
-  - presentationState:
-      base:
-        someOtherProperty: "value"
-    resources:
-      layouts:
-        mainBase:
-          elements: []
-out:
-  elements:
-    - id: "story"
-      type: "container"
-      x: 0
-      y: 0
-      children: []
-  animations: []
----
-case: story container does not exist - return unchanged state
-in:
-  - elements:
-      - id: "notStory"
-        type: "container"
-        children: []
-    animations: []
-  - presentationState:
-      base:
-        resourceId: "mainBase"
-    resources:
-      layouts:
-        mainBase:
-          elements: []
-out:
-  elements:
-    - id: "notStory"
-      type: "container"
-      children: []
-  animations: []
----
-case: layout not found in resources - return unchanged state
-in:
-  - elements:
-      - id: "story"
-        type: "container"
-        x: 0
-        y: 0
-        children: []
-    animations: []
-  - presentationState:
-      base:
-        resourceId: "nonExistentBase"
-    resources:
-      layouts:
-        mainBase:
-          elements: []
-out:
-  elements:
-    - id: "story"
-      type: "container"
-      x: 0
-      y: 0
-      children: []
-  animations: []
----
-case: empty layout elements array
-in:
-  - elements:
-      - id: "story"
-        type: "container"
-        x: 0
-        y: 0
-        children: []
-    animations: []
-  - presentationState:
-      base:
-        resourceId: "emptyBase"
-    resources:
-      layouts:
-        emptyBase:
-          elements: []
-out:
-  elements:
-    - id: "story"
-      type: "container"
-      x: 0
-      y: 0
-      children:
-        - id: "base"
-          type: "container"
-          children: []
-  animations: []
----
-case: null resources - return unchanged state
-in:
-  - elements:
-      - id: "story"
-        type: "container"
-        x: 0
-        y: 0
-        children: []
-    animations: []
-  - presentationState:
-      base:
-        resourceId: "someBase"
-    resources: null
-out:
-  elements:
-    - id: "story"
-      type: "container"
-      x: 0
-      y: 0
-      children: []
-  animations: []
----
-case: conditional elements with $if - renders matching branch (left rollback)
-in:
-  - elements:
-      - id: "story"
-        type: "container"
-        x: 0
-        y: 0
-        children: []
-    animations: []
-  - presentationState:
-      base:
-        resourceId: "conditionalBase"
-    resources:
-      layouts:
-        conditionalBase:
-          elements:
-            - "$if variables.rollbackSide == 'left'":
-                id: "left_container"
-                type: "container"
-                children:
-                  - id: "rollback_rect"
-                    type: "rect"
-                    width: 640
-                    height: 720
-                    x: 0
-                  - id: "forward_rect"
-                    type: "rect"
-                    width: 640
-                    height: 720
-                    x: 640
-            - "$if variables.rollbackSide == 'disable' || !variables.rollbackSide":
-                id: "full_rect"
-                type: "rect"
-                width: 1280
-                height: 720
-    variables:
-      rollbackSide: "left"
-out:
-  elements:
-    - id: "story"
-      type: "container"
-      x: 0
-      y: 0
-      children:
-        - id: "base"
-          type: "container"
-          children:
-            - id: "left_container"
-              type: "container"
-              children:
-                - id: "rollback_rect"
-                  type: "rect"
-                  width: 640
-                  height: 720
-                  x: 0
-                - id: "forward_rect"
-                  type: "rect"
-                  width: 640
-                  height: 720
-                  x: 640
-  animations: []
----
-case: conditional elements with $if - renders disable branch
-in:
-  - elements:
-      - id: "story"
-        type: "container"
-        x: 0
-        y: 0
-        children: []
-    animations: []
-  - presentationState:
-      base:
-        resourceId: "conditionalBase"
-    resources:
-      layouts:
-        conditionalBase:
-          elements:
-            - "$if variables.rollbackSide == 'left'":
-                id: "left_container"
-                type: "container"
-                children: []
-            - "$if variables.rollbackSide == 'disable' || !variables.rollbackSide":
-                id: "full_rect"
-                type: "rect"
-                width: 1280
-                height: 720
-    variables:
-      rollbackSide: "disable"
-out:
-  elements:
-    - id: "story"
-      type: "container"
-      x: 0
-      y: 0
-      children:
-        - id: "base"
-          type: "container"
-          children:
-            - id: "full_rect"
-              type: "rect"
-              width: 1280
-              height: 720
-  animations: []
----
-case: conditional elements with $if - no variables defaults to fallback
-in:
-  - elements:
-      - id: "story"
-        type: "container"
-        x: 0
-        y: 0
-        children: []
-    animations: []
-  - presentationState:
-      base:
-        resourceId: "conditionalBase"
-    resources:
-      layouts:
-        conditionalBase:
-          elements:
-            - "$if variables.rollbackSide == 'left'":
-                id: "left_container"
-                type: "container"
-                children: []
-            - "$if variables.rollbackSide == 'disable' || !variables.rollbackSide":
-                id: "full_rect"
-                type: "rect"
-                width: 1280
-                height: 720
-    variables: {}
-out:
-  elements:
-    - id: "story"
-      type: "container"
-      x: 0
-      y: 0
-      children:
-        - id: "base"
-          type: "container"
-          children:
-            - id: "full_rect"
-              type: "rect"
-              width: 1280
-              height: 720
-  animations: []
----
-case: resolves textStyleId in base layout elements
-in:
-  - elements:
-      - id: "story"
-        type: "container"
-        x: 0
-        y: 0
-        children: []
-    animations: []
-  - presentationState:
-      base:
-        resourceId: "styledBase"
-    resources:
-      layouts:
-        styledBase:
-          elements:
-            - id: "base-text"
-              type: "text"
-              content: "Base"
-              textStyleId: "body"
-      textStyles:
-        body:
-          fontId: "fontMain"
-          colorId: "fg"
-          fontSize: 24
-          fontWeight: "400"
-          fontStyle: "normal"
-          lineHeight: 1
-      fonts:
-        fontMain:
-          fileId: "Arial"
-      colors:
-        fg:
-          hex: "#FFFFFF"
-    variables: {}
-out:
-  elements:
-    - id: "story"
-      type: "container"
-      x: 0
-      y: 0
-      children:
-        - id: "base"
-          type: "container"
-          children:
-            - id: "base-text"
-              type: "text"
-              content: "Base"
-              textStyle:
-                fontFamily: "Arial"
-                fontSize: 24
-                fontWeight: "400"
-                fontStyle: "normal"
-                lineHeight: 1
-                fill: "#FFFFFF"
-  animations: []
----
-case: resolves colorId in base layout elements
-in:
-  - elements:
-      - id: "story"
-        type: "container"
-        x: 0
-        y: 0
-        children: []
-    animations: []
-  - presentationState:
-      base:
-        resourceId: "coloredBase"
-    resources:
-      layouts:
-        coloredBase:
-          elements:
-            - id: "base-panel"
-              type: "rect"
-              width: 1280
-              height: 720
-              colorId: "panel"
-      colors:
-        panel:
-          hex: "#111111"
-    variables: {}
-out:
-  elements:
-    - id: "story"
-      type: "container"
-      x: 0
-      y: 0
-      children:
-        - id: "base"
-          type: "container"
-          children:
-            - id: "base-panel"
-              type: "rect"
-              width: 1280
-              height: 720
-              fill: "#111111"
-  animations: []
----
-case: resolves imageId in base layout elements
-in:
-  - elements:
-      - id: "story"
-        type: "container"
-        x: 0
-        y: 0
-        children: []
-    animations: []
-  - presentationState:
-      base:
-        resourceId: "imageBase"
-    resources:
-      layouts:
-        imageBase:
-          elements:
-            - id: "base-image"
-              type: "sprite"
-              imageId: "backgroundImage"
-      images:
-        backgroundImage:
-          fileId: "background.png"
-          width: 1280
-          height: 720
-    variables: {}
-out:
-  elements:
-    - id: "story"
-      type: "container"
-      x: 0
-      y: 0
-      children:
-        - id: "base"
-          type: "container"
-          children:
-            - id: "base-image"
-              type: "sprite"
-              src: "background.png"
-              width: 1280
-              height: 720
-  animations: []
diff --git a/src/schemas/presentationActions.yaml b/src/schemas/presentationActions.yaml
index d9c51df..c7316a2 100644
--- a/src/schemas/presentationActions.yaml
+++ b/src/schemas/presentationActions.yaml
@@ -12,15 +12,6 @@ properties:
         description: Mode of cleaning/clearing all existing state
     additionalProperties: false
 
-  base:
-    type: object
-    description: Base layer behind the background
-    properties:
-      resourceId:
-        type: string
-        description: ID of the base resource to display
-    additionalProperties: false
-
   background:
     type: object
     description: Background management and display
diff --git a/src/stores/constructPresentationState.js b/src/stores/constructPresentationState.js
index 7651a5c..e9a0cf9 100644
--- a/src/stores/constructPresentationState.js
+++ b/src/stores/constructPresentationState.js
@@ -50,17 +50,6 @@ export const createInitialState = () => {
   return {};
 };
 
-/**
- * Applies base from presentation to state
- * @param {Object} state - The current state of the system
- * @param {Object} presentation - The presentation to apply
- */
-export const base = (state, presentation) => {
-  if (presentation.base) {
-    state.base = { ...presentation.base };
-  }
-};
-
 /**
  *
  * Applies background from presentation to state
@@ -397,7 +386,6 @@ export const cleanAll = (state, presentation) => {
 export const constructPresentationState = (presentations) => {
   const actions = [
     cleanAll,
-    base,
     background,
     sfx,
     bgm,
diff --git a/src/stores/constructRenderState.js b/src/stores/constructRenderState.js
index 9729f2f..d76a106 100644
--- a/src/stores/constructRenderState.js
+++ b/src/stores/constructRenderState.js
@@ -760,47 +760,6 @@ export const createInitialState = () => {
   };
 };
 
-/**
- * @param {Object} params
- */
-export const addBase = (state, { presentationState, resources, variables }) => {
-  const { elements } = state;
-  if (presentationState.base) {
-    // Find the story container
-    const storyContainer = getStoryContainer(elements);
-    if (!storyContainer) {
-      return state;
-    }
-
-    if (presentationState.base.resourceId) {
-      const layout = resources?.layouts[presentationState.base.resourceId];
-
-      if (layout) {
-        const baseContainer = {
-          id: "base",
-          type: "container",
-          children: layout.elements,
-        };
-
-        const processedContainer = parseAndRender(
-          baseContainer,
-          { variables },
-          { functions: jemplFunctions },
-        );
-
-        storyContainer.children.unshift(
-          resolveLayoutResourceIds(processedContainer, resources),
-        );
-      }
-    }
-  }
-  return state;
-};
-
-/**
- *
- * @param {Object} params
- */
 export const addBackgroundOrCg = (
   state,
   {
@@ -1718,14 +1677,13 @@ export const addLayeredViews = (
 
 export const constructRenderState = (params) => {
   const actions = [
-    addBase,
+    addControl,
     addBackgroundOrCg,
     addCharacters,
     addVisuals,
     addDialogue,
     addChoices,
     addLayout,
-    addControl,
     addBgm,
     addSfx,
     addVoice,
diff --git a/src/util.js b/src/util.js
index c79265e..d5c01c4 100644
--- a/src/util.js
+++ b/src/util.js
@@ -612,7 +612,6 @@ export const diffPresentationState = (prev = {}, curr = {}) => {
   };
 
   diffObject("background");
-  diffObject("base");
   diffObject("bgm");
   diffObject("voice");
 
diff --git a/vt/specs/background/animation-1.yaml b/vt/specs/background/animation-1.yaml
index 679912c..735285c 100644
--- a/vt/specs/background/animation-1.yaml
+++ b/vt/specs/background/animation-1.yaml
@@ -76,8 +76,6 @@ story:
           lines:
             - id: line1
               actions:
-                base:
-                  resourceId: base1
                 background:
                   resourceId: alkejf3la
                   animations:
diff --git a/vt/specs/background/animation-2.yaml b/vt/specs/background/animation-2.yaml
index 4571828..649ad68 100644
--- a/vt/specs/background/animation-2.yaml
+++ b/vt/specs/background/animation-2.yaml
@@ -67,8 +67,6 @@ story:
           lines:
             - id: line1
               actions:
-                base:
-                  resourceId: base1
                 background:
                   resourceId: alkejf3la
                   resourceType: image
diff --git a/vt/specs/background/animation-once-per-line.yaml b/vt/specs/background/animation-once-per-line.yaml
index 000a5ff..6ed8416 100644
--- a/vt/specs/background/animation-once-per-line.yaml
+++ b/vt/specs/background/animation-once-per-line.yaml
@@ -90,8 +90,6 @@ story:
           lines:
             - id: line1
               actions:
-                base:
-                  resourceId: base1
                 dialogue:
                   ui:
                     resourceId: dialogueGui
diff --git a/vt/specs/background/backgroundId.yaml b/vt/specs/background/backgroundId.yaml
index 57aedf0..525db2a 100644
--- a/vt/specs/background/backgroundId.yaml
+++ b/vt/specs/background/backgroundId.yaml
@@ -76,8 +76,6 @@ story:
           lines:
             - id: line1
               actions:
-                base:
-                  resourceId: base1
                 background:
                   resourceId: alkejf3la
             - id: line2
diff --git a/vt/specs/background/layout.yaml b/vt/specs/background/layout.yaml
index 4f619e5..e760b67 100644
--- a/vt/specs/background/layout.yaml
+++ b/vt/specs/background/layout.yaml
@@ -92,8 +92,6 @@ story:
           lines:
             - id: line1
               actions:
-                base:
-                  resourceId: base1
                 background:
                   resourceId: j3i8dk32
                   resourceType: layout
diff --git a/vt/specs/bgm/basic.yaml b/vt/specs/bgm/basic.yaml
index 1e738a0..525cb5e 100644
--- a/vt/specs/bgm/basic.yaml
+++ b/vt/specs/bgm/basic.yaml
@@ -79,7 +79,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 bgm:
                   resourceId: dk392
diff --git a/vt/specs/character/animation-1.yaml b/vt/specs/character/animation-1.yaml
index a20030c..1ea27ae 100644
--- a/vt/specs/character/animation-1.yaml
+++ b/vt/specs/character/animation-1.yaml
@@ -112,8 +112,6 @@ story:
           lines:
             - id: line1
               actions:
-                base:
-                  resourceId: base1
                 background:
                   resourceId: alkejf3la
                   resourceType: image
diff --git a/vt/specs/character/animation-2.yaml b/vt/specs/character/animation-2.yaml
index 2174951..8850c4b 100644
--- a/vt/specs/character/animation-2.yaml
+++ b/vt/specs/character/animation-2.yaml
@@ -153,8 +153,6 @@ story:
           lines:
             - id: line1
               actions:
-                base:
-                  resourceId: base1
                 background:
                   resourceId: alkejf3la
                   resourceType: image
diff --git a/vt/specs/character/basic.yaml b/vt/specs/character/basic.yaml
index 93d0304..b28ceee 100644
--- a/vt/specs/character/basic.yaml
+++ b/vt/specs/character/basic.yaml
@@ -60,8 +60,6 @@ story:
           lines:
             - id: line1
               actions:
-                base:
-                  resourceId: base1
                 background:
                   resourceId: alkejf3la
                 character:
diff --git a/vt/specs/character/custom-position.yaml b/vt/specs/character/custom-position.yaml
index ea9b83d..3b21848 100644
--- a/vt/specs/character/custom-position.yaml
+++ b/vt/specs/character/custom-position.yaml
@@ -60,8 +60,6 @@ story:
           lines:
             - id: line1
               actions:
-                base:
-                  resourceId: base1
                 background:
                   resourceId: alkejf3la
                 character:
diff --git a/vt/specs/character/duplicate-character.yaml b/vt/specs/character/duplicate-character.yaml
index 8608e3f..169b534 100644
--- a/vt/specs/character/duplicate-character.yaml
+++ b/vt/specs/character/duplicate-character.yaml
@@ -60,8 +60,6 @@ story:
           lines:
             - id: line1
               actions:
-                base:
-                  resourceId: base1
                 background:
                   resourceId: alkejf3la
                 character:
diff --git a/vt/specs/choice/animation.yaml b/vt/specs/choice/animation.yaml
index 27729e9..4e6f4ab 100644
--- a/vt/specs/choice/animation.yaml
+++ b/vt/specs/choice/animation.yaml
@@ -140,7 +140,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 dialogue:
                   ui:
diff --git a/vt/specs/choice/basic.yaml b/vt/specs/choice/basic.yaml
index 9f28f04..2a491ee 100644
--- a/vt/specs/choice/basic.yaml
+++ b/vt/specs/choice/basic.yaml
@@ -134,7 +134,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 dialogue:
                   mode: adv
@@ -160,7 +160,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 dialogue:
                   mode: adv
diff --git a/vt/specs/complete/one.yaml b/vt/specs/complete/one.yaml
index 86564c7..ad1c0a0 100644
--- a/vt/specs/complete/one.yaml
+++ b/vt/specs/complete/one.yaml
@@ -1419,7 +1419,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 visual:
                   items:
@@ -1444,8 +1444,6 @@ story:
           lines:
             - id: line1
               actions:
-                base:
-                  resourceId: storyScreenLayout
                 background:
                   resourceId: f3wklajf32
                 dialogue:
@@ -1548,7 +1546,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: storyScreenLayout
                   resourceType: layout
                 dialogue:
@@ -1602,7 +1600,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: extraScreenLayout
                   resourceType: layout
                 dialogue:
diff --git a/vt/specs/dialogue/animation.yaml b/vt/specs/dialogue/animation.yaml
index d38c0d6..fa3e95d 100644
--- a/vt/specs/dialogue/animation.yaml
+++ b/vt/specs/dialogue/animation.yaml
@@ -111,7 +111,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 dialogue:
                   ui:
diff --git a/vt/specs/dialogue/autoplay.yaml b/vt/specs/dialogue/autoplay.yaml
index b4261a4..2379047 100644
--- a/vt/specs/dialogue/autoplay.yaml
+++ b/vt/specs/dialogue/autoplay.yaml
@@ -140,7 +140,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: baseLayout
                 dialogue:
                   mode: adv
diff --git a/vt/specs/dialogue/basic.yaml b/vt/specs/dialogue/basic.yaml
index 7950e02..ae59ba3 100644
--- a/vt/specs/dialogue/basic.yaml
+++ b/vt/specs/dialogue/basic.yaml
@@ -96,7 +96,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 dialogue:
                   ui:
diff --git a/vt/specs/dialogue/history.yaml b/vt/specs/dialogue/history.yaml
index 41cde22..ca1af42 100644
--- a/vt/specs/dialogue/history.yaml
+++ b/vt/specs/dialogue/history.yaml
@@ -237,7 +237,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 dialogue:
                   ui:
diff --git a/vt/specs/dialogue/nvl-mode.yaml b/vt/specs/dialogue/nvl-mode.yaml
index f616a8e..e87befd 100644
--- a/vt/specs/dialogue/nvl-mode.yaml
+++ b/vt/specs/dialogue/nvl-mode.yaml
@@ -132,7 +132,7 @@ story:
           lines:
             - id: "1"
               actions:
-                base:
+                background:
                   resourceId: base1
                 dialogue:
                   mode: adv
diff --git a/vt/specs/dialogue/sceneMode.yaml b/vt/specs/dialogue/sceneMode.yaml
index 828c5c9..6c40d6d 100644
--- a/vt/specs/dialogue/sceneMode.yaml
+++ b/vt/specs/dialogue/sceneMode.yaml
@@ -135,7 +135,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: baseLayout
                 dialogue:
                   mode: adv
diff --git a/vt/specs/dialogue/skip.yaml b/vt/specs/dialogue/skip.yaml
index 74c0709..d5ece13 100644
--- a/vt/specs/dialogue/skip.yaml
+++ b/vt/specs/dialogue/skip.yaml
@@ -127,7 +127,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: baseLayout
                 dialogue:
                   mode: adv
diff --git a/vt/specs/dialogue/with-background.yaml b/vt/specs/dialogue/with-background.yaml
index b81b0f7..d63b26c 100644
--- a/vt/specs/dialogue/with-background.yaml
+++ b/vt/specs/dialogue/with-background.yaml
@@ -118,7 +118,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 dialogue:
                   ui:
diff --git a/vt/specs/initialization/initial-line.yaml b/vt/specs/initialization/initial-line.yaml
index 5e918d7..d529ea2 100644
--- a/vt/specs/initialization/initial-line.yaml
+++ b/vt/specs/initialization/initial-line.yaml
@@ -57,7 +57,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 dialogue:
                   ui:
diff --git a/vt/specs/keyboard/basic.yaml b/vt/specs/keyboard/basic.yaml
index cb3c61c..0aed771 100644
--- a/vt/specs/keyboard/basic.yaml
+++ b/vt/specs/keyboard/basic.yaml
@@ -76,7 +76,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: baseLayout
                 control:
                   resourceId: gameplay
diff --git a/vt/specs/layout/animation.yaml b/vt/specs/layout/animation.yaml
index 61e2207..db9d783 100644
--- a/vt/specs/layout/animation.yaml
+++ b/vt/specs/layout/animation.yaml
@@ -130,7 +130,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
             - id: line2
               actions:
diff --git a/vt/specs/layout/basic.yaml b/vt/specs/layout/basic.yaml
index 7eddb67..fbdebdc 100644
--- a/vt/specs/layout/basic.yaml
+++ b/vt/specs/layout/basic.yaml
@@ -83,7 +83,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 layout:
                   resourceId: j3i8dk32
diff --git a/vt/specs/layout/layeredViews.yaml b/vt/specs/layout/layeredViews.yaml
index 8781d84..ead03fe 100644
--- a/vt/specs/layout/layeredViews.yaml
+++ b/vt/specs/layout/layeredViews.yaml
@@ -216,5 +216,5 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: baseLayout
diff --git a/vt/specs/nextLineConfig/applyMode-persistent.yaml b/vt/specs/nextLineConfig/applyMode-persistent.yaml
index 7feabd6..7249711 100644
--- a/vt/specs/nextLineConfig/applyMode-persistent.yaml
+++ b/vt/specs/nextLineConfig/applyMode-persistent.yaml
@@ -68,7 +68,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: baseLayout
                 bgm:
                   resourceId: bgmMain
diff --git a/vt/specs/nextLineConfig/applyMode-singleLine.yaml b/vt/specs/nextLineConfig/applyMode-singleLine.yaml
index 3c8c371..b837225 100644
--- a/vt/specs/nextLineConfig/applyMode-singleLine.yaml
+++ b/vt/specs/nextLineConfig/applyMode-singleLine.yaml
@@ -68,7 +68,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: baseLayout
                 bgm:
                   resourceId: bgmMain
diff --git a/vt/specs/nextLineConfig/choice-stops-auto.yaml b/vt/specs/nextLineConfig/choice-stops-auto.yaml
index 72a842c..0e9d226 100644
--- a/vt/specs/nextLineConfig/choice-stops-auto.yaml
+++ b/vt/specs/nextLineConfig/choice-stops-auto.yaml
@@ -107,7 +107,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: baseLayout
                 bgm:
                   resourceId: bgmMain
diff --git a/vt/specs/nextLineConfig/completion-text-animation-choice.yaml b/vt/specs/nextLineConfig/completion-text-animation-choice.yaml
index 5aa14e8..7ba7bc4 100644
--- a/vt/specs/nextLineConfig/completion-text-animation-choice.yaml
+++ b/vt/specs/nextLineConfig/completion-text-animation-choice.yaml
@@ -119,7 +119,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: baseLayout
                 startAutoMode: {}
                 setNextLineConfig:
diff --git a/vt/specs/nextLineConfig/completion-video-animation.yaml b/vt/specs/nextLineConfig/completion-video-animation.yaml
index d327dba..30a3617 100644
--- a/vt/specs/nextLineConfig/completion-video-animation.yaml
+++ b/vt/specs/nextLineConfig/completion-video-animation.yaml
@@ -91,7 +91,7 @@ story:
           lines:
             - id: line0
               actions:
-                base:
+                background:
                   resourceId: baseLayout
                 dialogue:
                   mode: adv
diff --git a/vt/specs/save/basic.yaml b/vt/specs/save/basic.yaml
index e1c5103..88de1ab 100644
--- a/vt/specs/save/basic.yaml
+++ b/vt/specs/save/basic.yaml
@@ -362,7 +362,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: baseLayout
                 dialogue:
                   mode: adv
diff --git a/vt/specs/save/dynamic-slot-selector-test.yaml b/vt/specs/save/dynamic-slot-selector-test.yaml
index 60876fc..8295b8a 100644
--- a/vt/specs/save/dynamic-slot-selector-test.yaml
+++ b/vt/specs/save/dynamic-slot-selector-test.yaml
@@ -208,7 +208,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 layout:
                   resourceId: dynamicSlotsTestUI
diff --git a/vt/specs/save/multi-slot-test.yaml b/vt/specs/save/multi-slot-test.yaml
index 9a62b6b..750bb00 100644
--- a/vt/specs/save/multi-slot-test.yaml
+++ b/vt/specs/save/multi-slot-test.yaml
@@ -547,7 +547,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 layout:
                   resourceId: multiSlotTestUI
diff --git a/vt/specs/sectionTransition/basic.yaml b/vt/specs/sectionTransition/basic.yaml
index 2f5776e..c325cec 100644
--- a/vt/specs/sectionTransition/basic.yaml
+++ b/vt/specs/sectionTransition/basic.yaml
@@ -51,8 +51,6 @@ story:
           lines:
             - id: line1
               actions:
-                base:
-                  resourceId: base1
                 background:
                   resourceId: alkejf3la
             - id: line2
@@ -64,8 +62,6 @@ story:
           lines:
             - id: line1
               actions:
-                base:
-                  resourceId: base1
                 background:
                   resourceId: 8a3lkja
             - id: line2
@@ -81,8 +77,6 @@ story:
           lines:
             - id: line1
               actions:
-                base:
-                  resourceId: base1
                 background:
                   resourceId: img3
             - id: line2
diff --git a/vt/specs/sfx/basic.yaml b/vt/specs/sfx/basic.yaml
index aad9046..3e55715 100644
--- a/vt/specs/sfx/basic.yaml
+++ b/vt/specs/sfx/basic.yaml
@@ -79,7 +79,7 @@ story:
           lines:
             - id: line0
               actions:
-                base:
+                background:
                   resourceId: base1
                 dialogue:
                   ui:
diff --git a/vt/specs/slider/slider-variable-binding.yaml b/vt/specs/slider/slider-variable-binding.yaml
index 4259a2d..08ad49e 100644
--- a/vt/specs/slider/slider-variable-binding.yaml
+++ b/vt/specs/slider/slider-variable-binding.yaml
@@ -177,7 +177,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: baseLayout
                 layout:
                   resourceId: sliderTestLayout
diff --git a/vt/specs/variables/boolean-test.yaml b/vt/specs/variables/boolean-test.yaml
index 0cd4186..c91a1c3 100644
--- a/vt/specs/variables/boolean-test.yaml
+++ b/vt/specs/variables/boolean-test.yaml
@@ -270,7 +270,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 layout:
                   resourceId: booleanTestUI
diff --git a/vt/specs/variables/counter.yaml b/vt/specs/variables/counter.yaml
index 56f5d22..35697c4 100644
--- a/vt/specs/variables/counter.yaml
+++ b/vt/specs/variables/counter.yaml
@@ -118,7 +118,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 layout:
                   resourceId: j3i8dk32
diff --git a/vt/specs/variables/object-test.yaml b/vt/specs/variables/object-test.yaml
index e4c3d0c..8293d60 100644
--- a/vt/specs/variables/object-test.yaml
+++ b/vt/specs/variables/object-test.yaml
@@ -173,7 +173,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 layout:
                   resourceId: objectTestUI
diff --git a/vt/specs/variables/rollback-offset-test.yaml b/vt/specs/variables/rollback-offset-test.yaml
index f861c87..af28dcb 100644
--- a/vt/specs/variables/rollback-offset-test.yaml
+++ b/vt/specs/variables/rollback-offset-test.yaml
@@ -182,7 +182,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: baseLayout
                 updateVariable:
                   id: uvLine1
diff --git a/vt/specs/variables/rollback-test.yaml b/vt/specs/variables/rollback-test.yaml
index 6258843..6815af0 100644
--- a/vt/specs/variables/rollback-test.yaml
+++ b/vt/specs/variables/rollback-test.yaml
@@ -139,7 +139,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: baseLayout
                 dialogue:
                   mode: adv
diff --git a/vt/specs/variables/scope-comparison.yaml b/vt/specs/variables/scope-comparison.yaml
index 0b7ce02..dec9619 100644
--- a/vt/specs/variables/scope-comparison.yaml
+++ b/vt/specs/variables/scope-comparison.yaml
@@ -663,7 +663,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 layout:
                   resourceId: scopeComparisonUI
diff --git a/vt/specs/variables/string-test.yaml b/vt/specs/variables/string-test.yaml
index 78cd0d1..9e3914b 100644
--- a/vt/specs/variables/string-test.yaml
+++ b/vt/specs/variables/string-test.yaml
@@ -300,7 +300,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 layout:
                   resourceId: stringTestUI
diff --git a/vt/specs/video/background.yaml b/vt/specs/video/background.yaml
index b4e3e3a..9be60d0 100644
--- a/vt/specs/video/background.yaml
+++ b/vt/specs/video/background.yaml
@@ -40,8 +40,6 @@ story:
           lines:
             - id: line1
               actions:
-                base:
-                  resourceId: base1
                 background:
                   resourceId: video_sample_resource
                   resourceType: video
diff --git a/vt/specs/video/visual.yaml b/vt/specs/video/visual.yaml
index c3341ab..5b909ff 100644
--- a/vt/specs/video/visual.yaml
+++ b/vt/specs/video/visual.yaml
@@ -46,7 +46,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 visual:
                   items:
diff --git a/vt/specs/visual/animated.yaml b/vt/specs/visual/animated.yaml
index 580dd77..b0cdfcb 100644
--- a/vt/specs/visual/animated.yaml
+++ b/vt/specs/visual/animated.yaml
@@ -180,7 +180,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 visual:
                   items:
diff --git a/vt/specs/visual/transform.yaml b/vt/specs/visual/transform.yaml
index 1a42257..1e393e6 100644
--- a/vt/specs/visual/transform.yaml
+++ b/vt/specs/visual/transform.yaml
@@ -49,7 +49,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 visual:
                   items:
diff --git a/vt/specs/visual/visual-1.yaml b/vt/specs/visual/visual-1.yaml
index 14f2afb..fc3b23d 100644
--- a/vt/specs/visual/visual-1.yaml
+++ b/vt/specs/visual/visual-1.yaml
@@ -72,7 +72,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 visual:
                   items:
diff --git a/vt/specs/visual/visual-animation-1.yaml b/vt/specs/visual/visual-animation-1.yaml
index 29a9015..93e42b1 100644
--- a/vt/specs/visual/visual-animation-1.yaml
+++ b/vt/specs/visual/visual-animation-1.yaml
@@ -76,7 +76,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 visual:
                   items:
diff --git a/vt/specs/visual/visual-animation-2.yaml b/vt/specs/visual/visual-animation-2.yaml
index 16b4b2d..19007ba 100644
--- a/vt/specs/visual/visual-animation-2.yaml
+++ b/vt/specs/visual/visual-animation-2.yaml
@@ -84,7 +84,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 visual:
                   items:
diff --git a/vt/specs/visual/visual-layout.yaml b/vt/specs/visual/visual-layout.yaml
index 9b18156..c666780 100644
--- a/vt/specs/visual/visual-layout.yaml
+++ b/vt/specs/visual/visual-layout.yaml
@@ -111,7 +111,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 visual:
                   items:
diff --git a/vt/specs/visual/visual-multiple.yaml b/vt/specs/visual/visual-multiple.yaml
index 470c2aa..f120807 100644
--- a/vt/specs/visual/visual-multiple.yaml
+++ b/vt/specs/visual/visual-multiple.yaml
@@ -80,7 +80,7 @@ story:
           lines:
             - id: line1
               actions:
-                base:
+                background:
                   resourceId: base1
                 visual:
                   items:
diff --git a/vt/specs/visual/visual-snow-effect.yaml b/vt/specs/visual/visual-snow-effect.yaml
index a1c0c43..9383c14 100644
--- a/vt/specs/visual/visual-snow-effect.yaml
+++ b/vt/specs/visual/visual-snow-effect.yaml
@@ -130,8 +130,6 @@ story:
           lines:
             - id: line1
               actions:
-                base:
-                  resourceId: base1
                 background:
                   resourceId: winterBg
                   resourceType: image