diff --git a/rsconcept/frontend/src/components/Common/Checkbox.tsx b/rsconcept/frontend/src/components/Common/Checkbox.tsx
index 3a12cb07..6c8b11dc 100644
--- a/rsconcept/frontend/src/components/Common/Checkbox.tsx
+++ b/rsconcept/frontend/src/components/Common/Checkbox.tsx
@@ -13,7 +13,7 @@ export interface CheckboxProps {
   onChange?: (event: React.ChangeEvent<HTMLInputElement>) => void
 }
 
-function Checkbox({ id, required, disabled, tooltip, label, widthClass = 'w-full', value, onChange }: CheckboxProps) {
+function Checkbox({ id, required, disabled, tooltip, label, widthClass = 'w-fit', value, onChange }: CheckboxProps) {
   const inputRef = useRef<HTMLInputElement | null>(null);
 
   const cursor = disabled ? 'cursor-not-allowed' : 'cursor-pointer';
@@ -23,11 +23,11 @@ function Checkbox({ id, required, disabled, tooltip, label, widthClass = 'w-full
     if (!disabled) {
       inputRef.current?.click();
     }
-  } 
+  }
 
   return (
     <button
-      className={'flex gap-2 [&:not(:first-child)]:mt-3 ' + widthClass}
+      className={'flex [&:not(:first-child)]:mt-3 clr-outline focus:outline-dotted focus:outline-1 ' + widthClass}
       title={tooltip}
       disabled={disabled}
       onClick={handleClick}
@@ -42,7 +42,7 @@ function Checkbox({ id, required, disabled, tooltip, label, widthClass = 'w-full
       />
       { label && 
       <Label
-        className={`${cursor}`}
+        className={`${cursor} px-2`}
         text={label}
         required={required}
         htmlFor={id}
diff --git a/rsconcept/frontend/src/components/Common/FileInput.tsx b/rsconcept/frontend/src/components/Common/FileInput.tsx
index fcf590cf..c8c2927b 100644
--- a/rsconcept/frontend/src/components/Common/FileInput.tsx
+++ b/rsconcept/frontend/src/components/Common/FileInput.tsx
@@ -15,7 +15,7 @@ interface FileInputProps {
 
 function FileInput({ id, required, label, acceptType, widthClass = 'w-full', onChange }: FileInputProps) {
   const inputRef = useRef<HTMLInputElement | null>(null);
-  const [labelText, setLabelText] = useState('Файл не выбран');
+  const [labelText, setLabelText] = useState('');
 
   const handleUploadClick = () => {
     inputRef.current?.click();
@@ -25,7 +25,7 @@ function FileInput({ id, required, label, acceptType, widthClass = 'w-full', onC
     if (event.target.files && event.target.files.length > 0) {
       setLabelText(event.target.files[0].name)
     } else {
-      setLabelText('Файл не выбран')
+      setLabelText('')
     }
     if (onChange) {
       onChange(event);
diff --git a/rsconcept/frontend/src/index.css b/rsconcept/frontend/src/index.css
index 296406c4..06478d6f 100644
--- a/rsconcept/frontend/src/index.css
+++ b/rsconcept/frontend/src/index.css
@@ -189,7 +189,9 @@
     }
   }
 
-  :is(.clr-outline
+  :is(.clr-outline,
+    .clr-btn-default,
+    .clr-btn-primary
   ):focus {
     outline-width: 2px;
     outline-style: solid;
diff --git a/rsconcept/frontend/src/pages/CreateRSFormPage.tsx b/rsconcept/frontend/src/pages/CreateRSFormPage.tsx
index caf3e55e..9aecc2f0 100644
--- a/rsconcept/frontend/src/pages/CreateRSFormPage.tsx
+++ b/rsconcept/frontend/src/pages/CreateRSFormPage.tsx
@@ -94,7 +94,7 @@ function CreateRSFormPage() {
         value={common}
         onChange={event => setCommon(event.target.checked)}
       />
-      <FileInput id='trs' label='Загрузить *.trs'
+      <FileInput id='trs' label='Загрузить из Экстеор'
         acceptType='.trs'
         onChange={handleFile}
       />
diff --git a/rsconcept/frontend/src/pages/RSFormPage/DlgShowAST.tsx b/rsconcept/frontend/src/pages/RSFormPage/DlgShowAST.tsx
index 496b1ede..48dc4d39 100644
--- a/rsconcept/frontend/src/pages/RSFormPage/DlgShowAST.tsx
+++ b/rsconcept/frontend/src/pages/RSFormPage/DlgShowAST.tsx
@@ -1,11 +1,12 @@
-import { useMemo } from 'react';
-import { darkTheme, GraphCanvas, GraphEdge, GraphNode, lightTheme } from 'reagraph';
+import { useCallback, useMemo, useState } from 'react';
+import { GraphCanvas,GraphEdge, GraphNode } from 'reagraph';
 
 import Modal from '../../components/Common/Modal';
 import { useConceptTheme } from '../../context/ThemeContext';
+import { graphDarkT, graphLightT } from '../../utils/color';
 import { resources } from '../../utils/constants';
 import { SyntaxTree } from '../../utils/models';
-import { getNodeLabel } from '../../utils/staticUI';
+import { getASTNodeColor, getASTNodeLabel } from '../../utils/staticUI';
 
 interface DlgShowASTProps {
   hideWindow: () => void
@@ -14,15 +15,21 @@ interface DlgShowASTProps {
 }
 
 function DlgShowAST({ hideWindow, syntaxTree, expression }: DlgShowASTProps) {
-  const { darkMode } = useConceptTheme();
+  const { darkMode, colors } = useConceptTheme();
+  const [hoverID, setHoverID] = useState<number | undefined>(undefined);
+  const hoverNode = useMemo(
+  () => {
+    return syntaxTree.find(node => node.uid === hoverID);
+  }, [hoverID, syntaxTree]);
   
   const nodes: GraphNode[] = useMemo(
   () => syntaxTree.map(node => {
     return {
       id: String(node.uid),
-      label: getNodeLabel(node)
+      label: getASTNodeLabel(node),
+      fill: getASTNodeColor(node, colors),
     };
-  }), [syntaxTree]);
+  }), [syntaxTree, colors]);
 
   const edges: GraphEdge[] = useMemo(
   () => {
@@ -39,13 +46,32 @@ function DlgShowAST({ hideWindow, syntaxTree, expression }: DlgShowASTProps) {
     return result;
   }, [syntaxTree]);
 
+  const handleHoverIn = useCallback(
+  (node: GraphNode) => {
+    setHoverID(Number(node.id));
+  }, []);
+
+  const handleHoverOut = useCallback(
+  () => {
+    setHoverID(undefined);
+  }, []);
+
   return (
     <Modal
       hideWindow={hideWindow}
       readonly
     >
       <div className='flex flex-col items-start gap-2'>
-        <div className='w-full text-lg text-center'>{expression}</div>
+        <div className='w-full text-lg text-center'>
+          {!hoverNode && expression}
+          {hoverNode &&
+          <div className='flex justify-center whitespace-pre'>
+            <span>{expression.slice(0, hoverNode.start)}</span>
+            <span className='clr-selected'>{expression.slice(hoverNode.start, hoverNode.finish)}</span>
+            <span>{expression.slice(hoverNode.finish)}</span>
+          </div>
+          }
+        </div>
         <div className='flex-wrap w-full h-full overflow-auto'>
         <div className='relative w-[1040px] h-[600px] 2xl:w-[1680px] 2xl:h-[600px] max-h-full max-w-full'>
           <GraphCanvas
@@ -53,7 +79,9 @@ function DlgShowAST({ hideWindow, syntaxTree, expression }: DlgShowASTProps) {
             edges={edges}
             layoutType='hierarchicalTd'
             labelFontUrl={resources.graph_font}
-            theme={darkMode ? darkTheme : lightTheme}
+            theme={darkMode ? graphDarkT : graphLightT}
+            onNodePointerOver={handleHoverIn}
+            onNodePointerOut={handleHoverOut}
           />
         </div>
         </div>
diff --git a/rsconcept/frontend/src/pages/RSFormPage/EditorRSExpression.tsx b/rsconcept/frontend/src/pages/RSFormPage/EditorRSExpression.tsx
index 9e31d7f7..85652a61 100644
--- a/rsconcept/frontend/src/pages/RSFormPage/EditorRSExpression.tsx
+++ b/rsconcept/frontend/src/pages/RSFormPage/EditorRSExpression.tsx
@@ -222,7 +222,7 @@ function EditorRSExpression({
         { !loading && parseData && 
         <ParsingResult
           data={parseData} 
-          onShowAST={ast => onShowAST(value, ast)}
+          onShowAST={ast => onShowAST(getCstExpressionPrefix(activeCst!) + value, ast)}
           onShowError={onShowError}
         />}
         { !loading && !parseData &&
diff --git a/rsconcept/frontend/src/utils/staticUI.ts b/rsconcept/frontend/src/utils/staticUI.ts
index c563f5c0..b4fa7102 100644
--- a/rsconcept/frontend/src/utils/staticUI.ts
+++ b/rsconcept/frontend/src/utils/staticUI.ts
@@ -598,13 +598,14 @@ export function getRSErrorMessage(error: IRSErrorDescription): string {
   return 'UNKNOWN ERROR';
 }
 
-export function getNodeLabel(node: ISyntaxTreeNode): string {
+export function getASTNodeLabel(node: ISyntaxTreeNode): string {
   switch(node.typeID) {
-  case TokenID.ID_LOCAL: return node.data.value as string;
-  case TokenID.ID_GLOBAL: return node.data.value as string;
-  case TokenID.ID_FUNCTION: return node.data.value as string;
-  case TokenID.ID_PREDICATE: return node.data.value as string;
-  case TokenID.ID_RADICAL: return node.data.value as string;
+  case TokenID.ID_LOCAL:
+  case TokenID.ID_GLOBAL:
+  case TokenID.ID_FUNCTION:
+  case TokenID.ID_PREDICATE:
+  case TokenID.ID_RADICAL:
+    return node.data.value as string;
 
   case TokenID.LIT_INTEGER: return String(node.data.value as number);
 
@@ -675,3 +676,82 @@ export function getNodeLabel(node: ISyntaxTreeNode): string {
  // node
   return 'UNKNOWN ' + String(node.typeID);
 }
+
+export function getASTNodeColor(node: ISyntaxTreeNode, colors: IColorTheme): string {
+  switch(node.typeID) {
+    case TokenID.PUNC_DEFINE:
+    case TokenID.PUNC_STRUCT:
+    case TokenID.ID_LOCAL:
+      return colors.green;
+    
+    case TokenID.ID_GLOBAL:
+    case TokenID.ID_FUNCTION:
+    case TokenID.ID_PREDICATE:
+    case TokenID.ID_RADICAL:
+    case TokenID.LIT_INTEGER:
+    case TokenID.LIT_EMPTYSET:
+    case TokenID.LIT_INTSET:
+      return colors.teal;
+    
+    case TokenID.FORALL:
+    case TokenID.EXISTS:
+    case TokenID.NOT:
+    case TokenID.AND:
+    case TokenID.OR:
+    case TokenID.IMPLICATION:
+    case TokenID.EQUIVALENT:
+    case TokenID.GREATER:
+    case TokenID.LESSER:
+    case TokenID.EQUAL:
+    case TokenID.NOTEQUAL:
+    case TokenID.GREATER_OR_EQ:
+    case TokenID.LESSER_OR_EQ:
+    case TokenID.IN:
+    case TokenID.NOTIN:
+    case TokenID.SUBSET_OR_EQ:
+    case TokenID.SUBSET:
+    case TokenID.NOTSUBSET:
+      return colors.orange;
+    
+    case TokenID.NT_TUPLE:
+    case TokenID.NT_ENUMERATION:
+    case TokenID.BIGPR:
+    case TokenID.SMALLPR:
+    case TokenID.FILTER:
+    case TokenID.PLUS:
+    case TokenID.MINUS:
+    case TokenID.MULTIPLY:
+    case TokenID.BOOLEAN:
+    case TokenID.DECART:
+    case TokenID.INTERSECTION:
+    case TokenID.UNION:
+    case TokenID.SET_MINUS:
+    case TokenID.SYMMINUS:
+    case TokenID.REDUCE:
+    case TokenID.CARD:
+    case TokenID.BOOL:
+    case TokenID.DEBOOL:
+      return colors.blue;
+
+    case TokenID.NT_FUNC_DEFINITION:
+    case TokenID.NT_DECLARATIVE_EXPR:
+    case TokenID.NT_IMPERATIVE_EXPR:
+    case TokenID.NT_RECURSIVE_FULL:
+    case TokenID.NT_ENUM_DECL:
+    case TokenID.NT_TUPLE_DECL:
+    case TokenID.NT_ARG_DECL:
+    case TokenID.NT_FUNC_CALL:
+    case TokenID.NT_ARGUMENTS:
+    case TokenID.NT_IMP_DECLARE:
+    case TokenID.NT_IMP_ASSIGN:
+    case TokenID.NT_IMP_LOGIC:
+    case TokenID.NT_RECURSIVE_SHORT:
+        return '';
+
+    case TokenID.PUNC_ASSIGN:
+    case TokenID.PUNC_ITERATE:
+      return colors.red;
+    }
+   // node
+    return colors.red;
+}