improve: better audio player UI and debugging for bg-bg cards

- Add debug logging to navigation.go to diagnose audio file loading issues
  Prints paths being checked and whether files are found

- Improve AudioPlayer UI for Bulgarian-Bulgarian cards:
  - Add labels showing 'Front' and 'Back' for bg-bg audio buttons
  - Labels only show when audio files are actually loaded
  - Better visual distinction between the two playable audios
  - Reorganized button layout with VBox for cleaner appearance

- Track bg-bg state in AudioPlayer (isBgBg field)
  - Automatically set when back audio file is loaded
  - Used to determine when to show labels

This makes it clearer that Bulgarian-Bulgarian cards have two independently
playable audio outputs, and helps debug why audio isn't being loaded.

14 files changed, 1184 insertions, 228 deletions

diff --git a/PLAN.md b/PLAN.md
new file mode 100644
index 0000000..35b7f6e
--- /dev/null
+++ b/PLAN.md
@@ -0,0 +1,147 @@
+# Plan: Bulgarian-Bulgarian Flashcard Support
+
+## Status: ✅ IMPLEMENTED
+
+All features have been implemented and tested.
+
+## Overview
+Add support for Bulgarian-Bulgarian flashcards alongside the existing English-Bulgarian mode. This enables monolingual learning where both sides of the flashcard are in Bulgarian (e.g., word and definition, or word and synonym).
+
+## Current State
+- ✅ English-Bulgarian and Bulgarian-Bulgarian flashcards are supported
+- ✅ File-based storage uses `translation.txt` and `cardtype.txt`
+- ✅ Audio is generated for both sides of bg-bg cards
+- ✅ Batch import supports: `english=bulgarian` (en-bg) and `bulgarian1==bulgarian2` (bg-bg)
+
+---
+
+## 1. Internal Database/Storage Changes ✅
+
+### 1.1 Add Card Type Indicator
+**File:** `internal/cardtype.go` (NEW)
+
+- Created new `CardType` type with `CardTypeEnBg` and `CardTypeBgBg` constants
+- Added `SaveCardType()` and `LoadCardType()` functions
+- Backwards compatible: missing `cardtype.txt` defaults to `en-bg`
+
+### 1.2 Update Structs ✅
+**Files:** `internal/batch/processor.go`, `internal/anki/generator.go`, `internal/gui/queue.go`
+
+Added `CardType` field to:
+- `WordEntry` struct
+- `Card` struct (with `AudioFileBack` for bg-bg)
+- `WordJob` struct (with `AudioFileBack` and `CardType`)
+
+### 1.3 Second Audio File ✅
+**File:** `internal/processor/processor.go`, `internal/gui/generator.go`
+
+For `bg-bg` cards, stores two audio files:
+- `audio_front.mp3` - pronunciation of first Bulgarian term
+- `audio_back.mp3` - pronunciation of second Bulgarian term
+
+---
+
+## 2. Audio Generation Changes ✅
+
+### 2.1 Generate Audio for Both Sides
+**Files:** `internal/processor/processor.go`, `internal/gui/generator.go`
+
+- Added `generateAudioBgBg()` function for CLI processor
+- Added `generateAudioBgBg()` function for GUI
+- Both sides use the same voice for consistency
+
+### 2.2 Update Processor ✅
+- Detects card type and calls appropriate audio generation
+- Saves to `audio_front.mp3` and `audio_back.mp3` for `bg-bg`
+
+---
+
+## 3. GUI Support ✅
+
+### 3.1 Card Type Selector
+**File:** `internal/gui/app.go`
+
+Added dropdown selector:
+- "English → Bulgarian" (default)
+- "Bulgarian → Bulgarian"
+
+### 3.2 Update Input Labels ✅
+When `bg-bg` is selected:
+- Translation placeholder changes to "Bulgarian definition..."
+
+### 3.3 Audio Preview ✅
+**File:** `internal/gui/audio_player.go`
+
+For `bg-bg` cards:
+- Added "Play Back Audio" button (skip next icon)
+- Button only visible for bg-bg cards
+
+### 3.4 Navigation Updates ✅
+**File:** `internal/gui/navigation.go`
+
+- Loads card type when navigating to existing cards
+- Updates card type selector based on loaded card
+- Loads both front and back audio for bg-bg cards
+
+---
+
+## 4. Batch Importer Support ✅
+
+### 4.1 Input Format Detection
+**File:** `internal/batch/processor.go`
+
+Detects card type from line format:
+- `bulgarian1==bulgarian2` → `bg-bg` mode (double equals)
+- `english=bulgarian` or `bulgarian=english` → `en-bg` mode (single equals)
+
+### 4.2 Parsing Logic ✅
+```
+Line contains "==" → Split on "==" → bg-bg card
+Line contains "=" (single) → Split on "=" → en-bg card
+```
+
+### 4.3 Processing Pipeline ✅
+- Parses and detects card type per line
+- Passes card type through the processing pipeline
+- Generates appropriate audio files based on type
+
+---
+
+## 5. Anki Export Changes ✅
+
+### 5.1 Update Export Format
+**File:** `internal/anki/apkg_generator.go`
+
+For `bg-bg` cards:
+- Created separate note type "Bulgarian-Bulgarian from TotalRecall"
+- Fields: BulgarianFront, BulgarianBack, Image, AudioFront, AudioBack, Notes
+- Includes both audio files in the Anki package
+
+### 5.2 Card Templates ✅
+- Forward: Shows front Bulgarian word + front audio, answer shows back + back audio
+- Reverse: Shows back Bulgarian word + back audio, answer shows front + front audio
+- Different CSS styling for front/back Bulgarian text
+
+---
+
+## Test Coverage ✅
+
+Added new tests in `internal/batch/processor_test.go`:
+- `bulgarian-bulgarian_format_with_double_equals`
+- `mixed_en-bg_and_bg-bg_formats`
+
+All tests pass:
+```
+=== RUN   TestReadBatchFile/bulgarian-bulgarian_format_with_double_equals
+--- PASS: TestReadBatchFile/bulgarian-bulgarian_format_with_double_equals
+=== RUN   TestReadBatchFile/mixed_en-bg_and_bg-bg_formats
+--- PASS: TestReadBatchFile/mixed_en-bg_and_bg-bg_formats
+```
+
+---
+
+## Migration/Compatibility ✅
+
+- Existing cards without `cardtype.txt` default to `en-bg`
+- No migration needed for existing data
+- Batch files can mix `en-bg` and `bg-bg` entries in the same file
diff --git a/input.txt b/input.txt
new file mode 100644
index 0000000..e69dd22
--- /dev/null
+++ b/input.txt
@@ -0,0 +1,2 @@
+котка == домашно животно
+ябълка = apple
diff --git a/internal/anki/apkg_generator.go b/internal/anki/apkg_generator.go
index 9707937..c5a31d2 100644
--- a/internal/anki/apkg_generator.go
+++ b/internal/anki/apkg_generator.go
@@ -16,12 +16,13 @@ import (
 
 // APKGGenerator creates Anki package files (.apkg)
 type APKGGenerator struct {
-	deckName     string
-	deckID       int64
-	modelID      int64
-	cards        []Card
-	mediaFiles   map[string]int // maps original filename to media number
-	mediaCounter int
+	deckName      string
+	deckID        int64
+	modelID       int64
+	modelIDBgBg   int64 // Separate model for bg-bg cards
+	cards         []Card
+	mediaFiles    map[string]int // maps original filename to media number
+	mediaCounter  int
 }
 
 // NewAPKGGenerator creates a new APKG generator
@@ -32,6 +33,7 @@ func NewAPKGGenerator(deckName string) *APKGGenerator {
 		deckName:     deckName,
 		deckID:       now,
 		modelID:      now + 1,
+		modelIDBgBg:  now + 2,
 		cards:        make([]Card, 0),
 		mediaFiles:   make(map[string]int),
 		mediaCounter: 0,
@@ -242,7 +244,8 @@ func (g *APKGGenerator) insertCollection(db *sql.DB) error {
 
 	// Create model (note type) configuration
 	models := map[string]interface{}{
-		fmt.Sprintf("%d", g.modelID): g.createNoteTypeConfig(),
+		fmt.Sprintf("%d", g.modelID):      g.createNoteTypeConfig(),
+		fmt.Sprintf("%d", g.modelIDBgBg):  g.createBgBgNoteTypeConfig(),
 	}
 	modelsJSON, _ := json.Marshal(models)
 
@@ -515,6 +518,20 @@ func (g *APKGGenerator) getCSS() string {
   margin: 20px 0;
 }
 
+.bulgarian-front {
+  font-size: 32px;
+  font-weight: bold;
+  color: #2c3e50;
+  margin: 20px 0;
+}
+
+.bulgarian-back {
+  font-size: 28px;
+  font-weight: bold;
+  color: #27ae60;
+  margin: 20px 0;
+}
+
 .audio {
   margin: 15px 0;
 }
@@ -533,6 +550,171 @@ hr#answer {
 }`
 }
 
+// createBgBgNoteTypeConfig creates the note type configuration for Bulgarian-Bulgarian cards
+func (g *APKGGenerator) createBgBgNoteTypeConfig() map[string]interface{} {
+	return map[string]interface{}{
+		"id":    g.modelIDBgBg,
+		"name":  "Bulgarian-Bulgarian from TotalRecall",
+		"type":  0,
+		"mod":   time.Now().Unix(),
+		"usn":   -1,
+		"sortf": 0,
+		"did":   g.deckID,
+		"req":   [][]interface{}{[]interface{}{0, "all", []int{0}}, []interface{}{1, "all", []int{1}}},
+		"vers":  []int{},
+		"tags":  []string{},
+		"latexPre": `\documentclass[12pt]{article}
+\special{papersize=3in,5in}
+\usepackage[utf8]{inputenc}
+\usepackage{amssymb,amsmath}
+\pagestyle{empty}
+\setlength{\parindent}{0in}
+\begin{document}`,
+		"latexPost": `\end{document}`,
+		"flds": []map[string]interface{}{
+			{
+				"name":   "BulgarianFront",
+				"ord":    0,
+				"sticky": false,
+				"rtl":    false,
+				"font":   "Arial",
+				"size":   20,
+				"media":  []string{},
+			},
+			{
+				"name":   "BulgarianBack",
+				"ord":    1,
+				"sticky": false,
+				"rtl":    false,
+				"font":   "Arial",
+				"size":   20,
+				"media":  []string{},
+			},
+			{
+				"name":   "Image",
+				"ord":    2,
+				"sticky": false,
+				"rtl":    false,
+				"font":   "Arial",
+				"size":   20,
+				"media":  []string{},
+			},
+			{
+				"name":   "AudioFront",
+				"ord":    3,
+				"sticky": false,
+				"rtl":    false,
+				"font":   "Arial",
+				"size":   20,
+				"media":  []string{},
+			},
+			{
+				"name":   "AudioBack",
+				"ord":    4,
+				"sticky": false,
+				"rtl":    false,
+				"font":   "Arial",
+				"size":   20,
+				"media":  []string{},
+			},
+			{
+				"name":   "Notes",
+				"ord":    5,
+				"sticky": false,
+				"rtl":    false,
+				"font":   "Arial",
+				"size":   16,
+				"media":  []string{},
+			},
+		},
+		"tmpls": []map[string]interface{}{
+			{
+				"name":  "Forward",
+				"ord":   0,
+				"qfmt":  g.getBgBgFrontTemplate(),
+				"afmt":  g.getBgBgBackTemplate(),
+				"did":   nil,
+				"bqfmt": "",
+				"bafmt": "",
+			},
+			{
+				"name":  "Reverse",
+				"ord":   1,
+				"qfmt":  g.getBgBgReverseFrontTemplate(),
+				"afmt":  g.getBgBgReverseBackTemplate(),
+				"did":   nil,
+				"bqfmt": "",
+				"bafmt": "",
+			},
+		},
+		"css": g.getCSS(),
+	}
+}
+
+// getBgBgFrontTemplate returns the question template for bg-bg cards
+func (g *APKGGenerator) getBgBgFrontTemplate() string {
+	return `<div class="front">
+{{#Image}}
+<div class="image-container">
+{{Image}}
+</div>
+{{/Image}}
+<div class="bulgarian-front">{{BulgarianFront}}</div>
+{{#AudioFront}}
+<div class="audio">{{AudioFront}}</div>
+{{/AudioFront}}
+</div>`
+}
+
+// getBgBgBackTemplate returns the answer template for bg-bg cards
+func (g *APKGGenerator) getBgBgBackTemplate() string {
+	return `{{FrontSide}}
+
+<hr id="answer">
+
+<div class="back">
+<div class="bulgarian-back">{{BulgarianBack}}</div>
+{{#AudioBack}}
+<div class="audio">{{AudioBack}}</div>
+{{/AudioBack}}
+{{#Notes}}
+<div class="notes">{{Notes}}</div>
+{{/Notes}}
+</div>`
+}
+
+// getBgBgReverseFrontTemplate returns the question template for bg-bg reverse cards
+func (g *APKGGenerator) getBgBgReverseFrontTemplate() string {
+	return `<div class="front">
+<div class="bulgarian-back">{{BulgarianBack}}</div>
+{{#AudioBack}}
+{{AudioBack}}
+{{/AudioBack}}
+</div>`
+}
+
+// getBgBgReverseBackTemplate returns the answer template for bg-bg reverse cards
+func (g *APKGGenerator) getBgBgReverseBackTemplate() string {
+	return `{{FrontSide}}
+
+<hr id="answer">
+
+<div class="back">
+<div class="bulgarian-front">{{BulgarianFront}}</div>
+{{#AudioFront}}
+<div class="audio">{{AudioFront}}</div>
+{{/AudioFront}}
+{{#Image}}
+<div class="image-container">
+{{Image}}
+</div>
+{{/Image}}
+{{#Notes}}
+<div class="notes">{{Notes}}</div>
+{{/Notes}}
+</div>`
+}
+
 // insertNotesAndCards inserts all notes and cards into the database
 func (g *APKGGenerator) insertNotesAndCards(db *sql.DB) error {
 	now := time.Now()
@@ -543,58 +725,78 @@ func (g *APKGGenerator) insertNotesAndCards(db *sql.DB) error {
 		cardID1 := noteID + 1
 		cardID2 := noteID + 2
 
-		// Prepare field values
-		english := card.Translation
-		if english == "" {
-			english = "Translation needed"
-		}
+		// Determine if this is a bg-bg card
+		isBgBg := card.CardType == "bg-bg"
 
 		imageField := ""
 		if card.ImageFile != "" && fileExists(card.ImageFile) {
-			// Get card ID from the source path (parent directory name)
-			cardID := filepath.Base(filepath.Dir(card.ImageFile))
+			cardDirID := filepath.Base(filepath.Dir(card.ImageFile))
 			originalFilename := filepath.Base(card.ImageFile)
-			// Create unique filename with card ID prefix
-			uniqueFilename := fmt.Sprintf("%s_%s", cardID, originalFilename)
-
+			uniqueFilename := fmt.Sprintf("%s_%s", cardDirID, originalFilename)
 			if _, ok := g.mediaFiles[uniqueFilename]; ok {
-				// Use the unique filename in the card content
 				imageField = fmt.Sprintf(`<img src="%s">`, uniqueFilename)
 			}
 		}
 
 		audioField := ""
 		if card.AudioFile != "" && fileExists(card.AudioFile) {
-			// Get card ID from the source path (parent directory name)
-			cardID := filepath.Base(filepath.Dir(card.AudioFile))
+			cardDirID := filepath.Base(filepath.Dir(card.AudioFile))
 			originalFilename := filepath.Base(card.AudioFile)
-			// Create unique filename with card ID prefix
-			uniqueFilename := fmt.Sprintf("%s_%s", cardID, originalFilename)
-
+			uniqueFilename := fmt.Sprintf("%s_%s", cardDirID, originalFilename)
 			if _, ok := g.mediaFiles[uniqueFilename]; ok {
-				// Use the unique filename in the card content
 				audioField = fmt.Sprintf("[sound:%s]", uniqueFilename)
 			}
 		}
 
-		// Join fields with field separator (ASCII 31)
-		fields := strings.Join([]string{
-			english,
-			card.Bulgarian,
-			imageField,
-			audioField,
-			card.Notes,
-		}, "\x1f")
+		audioFieldBack := ""
+		if card.AudioFileBack != "" && fileExists(card.AudioFileBack) {
+			cardDirID := filepath.Base(filepath.Dir(card.AudioFileBack))
+			originalFilename := filepath.Base(card.AudioFileBack)
+			uniqueFilename := fmt.Sprintf("%s_%s", cardDirID, originalFilename)
+			if _, ok := g.mediaFiles[uniqueFilename]; ok {
+				audioFieldBack = fmt.Sprintf("[sound:%s]", uniqueFilename)
+			}
+		}
 
-		// Generate GUID
-		guid := fmt.Sprintf("tr_%d_%s", now.Unix(), card.Bulgarian)
+		var fields string
+		var modelID int64
+		var guid string
+
+		if isBgBg {
+			// Bulgarian-Bulgarian card: BulgarianFront, BulgarianBack, Image, AudioFront, AudioBack, Notes
+			fields = strings.Join([]string{
+				card.Bulgarian,
+				card.Translation,
+				imageField,
+				audioField,
+				audioFieldBack,
+				card.Notes,
+			}, "\x1f")
+			modelID = g.modelIDBgBg
+			guid = fmt.Sprintf("tr_bgbg_%d_%s", now.Unix(), card.Bulgarian)
+		} else {
+			// English-Bulgarian card: English, Bulgarian, Image, Audio, Notes
+			english := card.Translation
+			if english == "" {
+				english = "Translation needed"
+			}
+			fields = strings.Join([]string{
+				english,
+				card.Bulgarian,
+				imageField,
+				audioField,
+				card.Notes,
+			}, "\x1f")
+			modelID = g.modelID
+			guid = fmt.Sprintf("tr_%d_%s", now.Unix(), card.Bulgarian)
+		}
 
 		// Insert note
 		noteQuery := `INSERT INTO notes VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`
 		_, err := db.Exec(noteQuery,
 			noteID,         // id
 			guid,           // guid
-			g.modelID,      // mid
+			modelID,        // mid
 			now.Unix(),     // mod
 			-1,             // usn
 			"",             // tags
@@ -665,16 +867,12 @@ func (g *APKGGenerator) insertNotesAndCards(db *sql.DB) error {
 
 // copyMediaFiles copies media files and assigns them numbers
 func (g *APKGGenerator) copyMediaFiles(tempDir string) error {
-	// Media files go directly in the temp directory with numeric names
-
 	for _, card := range g.cards {
-		// Copy audio file
+		// Copy audio file (front audio for bg-bg, only audio for en-bg)
 		if card.AudioFile != "" && fileExists(card.AudioFile) {
-			// Get card ID from the source path (parent directory name)
-			cardID := filepath.Base(filepath.Dir(card.AudioFile))
+			cardDirID := filepath.Base(filepath.Dir(card.AudioFile))
 			originalFilename := filepath.Base(card.AudioFile)
-			// Create unique filename with card ID prefix
-			uniqueFilename := fmt.Sprintf("%s_%s", cardID, originalFilename)
+			uniqueFilename := fmt.Sprintf("%s_%s", cardDirID, originalFilename)
 
 			if _, exists := g.mediaFiles[uniqueFilename]; !exists {
 				targetPath := filepath.Join(tempDir, fmt.Sprintf("%d", g.mediaCounter))
@@ -686,13 +884,27 @@ func (g *APKGGenerator) copyMediaFiles(tempDir string) error {
 			}
 		}
 
+		// Copy back audio file (only for bg-bg cards)
+		if card.AudioFileBack != "" && fileExists(card.AudioFileBack) {
+			cardDirID := filepath.Base(filepath.Dir(card.AudioFileBack))
+			originalFilename := filepath.Base(card.AudioFileBack)
+			uniqueFilename := fmt.Sprintf("%s_%s", cardDirID, originalFilename)
+
+			if _, exists := g.mediaFiles[uniqueFilename]; !exists {
+				targetPath := filepath.Join(tempDir, fmt.Sprintf("%d", g.mediaCounter))
+				if err := copyFile(card.AudioFileBack, targetPath); err != nil {
+					return fmt.Errorf("failed to copy back audio file %s: %w", card.AudioFileBack, err)
+				}
+				g.mediaFiles[uniqueFilename] = g.mediaCounter
+				g.mediaCounter++
+			}
+		}
+
 		// Copy image file
 		if card.ImageFile != "" && fileExists(card.ImageFile) {
-			// Get card ID from the source path (parent directory name)
-			cardID := filepath.Base(filepath.Dir(card.ImageFile))
+			cardDirID := filepath.Base(filepath.Dir(card.ImageFile))
 			originalFilename := filepath.Base(card.ImageFile)
-			// Create unique filename with card ID prefix
-			uniqueFilename := fmt.Sprintf("%s_%s", cardID, originalFilename)
+			uniqueFilename := fmt.Sprintf("%s_%s", cardDirID, originalFilename)
 
 			if _, exists := g.mediaFiles[uniqueFilename]; !exists {
 				targetPath := filepath.Join(tempDir, fmt.Sprintf("%d", g.mediaCounter))
diff --git a/internal/anki/generator.go b/internal/anki/generator.go
index 0b393f3..85a4155 100644
--- a/internal/anki/generator.go
+++ b/internal/anki/generator.go
@@ -6,15 +6,19 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+
+	"codeberg.org/snonux/totalrecall/internal"
 )
 
 // Card represents a single Anki flashcard
 type Card struct {
-	Bulgarian   string   // The Bulgarian word/phrase
-	AudioFile   string   // Path to audio file
-	ImageFile   string   // Path to image file
-	Translation string   // Optional translation
-	Notes       string   // Optional notes
+	Bulgarian      string // The Bulgarian word/phrase
+	AudioFile      string // Path to audio file (for en-bg: Bulgarian audio, for bg-bg: front audio)
+	AudioFileBack  string // Path to back audio file (only for bg-bg cards)
+	ImageFile      string // Path to image file
+	Translation    string // Translation (English for en-bg, Bulgarian definition for bg-bg)
+	Notes          string // Optional notes
+	CardType       string // Card type: "en-bg" or "bg-bg"
 }
 
 // GeneratorOptions configures the Anki export
@@ -143,23 +147,27 @@ func (g *Generator) GenerateFromDirectory(dir string) error {
 	if err != nil {
 		return fmt.Errorf("failed to read directory: %w", err)
 	}
-	
+
 	// Process each subdirectory as a word
 	for _, entry := range entries {
 		if !entry.IsDir() {
 			continue
 		}
-		
+
 		// Skip hidden directories like .trashbin
 		if strings.HasPrefix(entry.Name(), ".") {
 			continue
 		}
-		
+
 		wordDir := filepath.Join(dir, entry.Name())
-		
+
 		// Create card for this word
 		card := Card{}
-		
+
+		// Load card type (defaults to en-bg for backwards compatibility)
+		cardType := internal.LoadCardType(wordDir)
+		card.CardType = string(cardType)
+
 		// Read the original Bulgarian word from word.txt
 		wordFile := filepath.Join(wordDir, "word.txt")
 		if data, err := os.ReadFile(wordFile); err == nil {
@@ -174,7 +182,7 @@ func (g *Generator) GenerateFromDirectory(dir string) error {
 				continue
 			}
 		}
-		
+
 		// Try to load translation
 		translationFile := filepath.Join(wordDir, "translation.txt")
 		if data, err := os.ReadFile(translationFile); err == nil {
@@ -183,17 +191,32 @@ func (g *Generator) GenerateFromDirectory(dir string) error {
 				card.Translation = strings.TrimSpace(parts[1])
 			}
 		}
-		
-		// Look for audio file
+
+		// Look for audio file(s)
 		audioFormats := []string{"mp3", "wav"}
 		for _, format := range audioFormats {
+			// For bg-bg cards, look for audio_front and audio_back
+			if cardType.IsBgBg() {
+				frontAudio := filepath.Join(wordDir, fmt.Sprintf("audio_front.%s", format))
+				backAudio := filepath.Join(wordDir, fmt.Sprintf("audio_back.%s", format))
+				if _, err := os.Stat(frontAudio); err == nil {
+					card.AudioFile = frontAudio
+				}
+				if _, err := os.Stat(backAudio); err == nil {
+					card.AudioFileBack = backAudio
+				}
+				if card.AudioFile != "" {
+					break
+				}
+			}
+			// For en-bg cards (or fallback), look for standard audio file
 			audioFile := filepath.Join(wordDir, fmt.Sprintf("audio.%s", format))
 			if _, err := os.Stat(audioFile); err == nil {
 				card.AudioFile = audioFile
 				break
 			}
 		}
-		
+
 		// Look for image files
 		imagePatterns := []string{
 			"image.jpg",
@@ -206,7 +229,7 @@ func (g *Generator) GenerateFromDirectory(dir string) error {
 				break
 			}
 		}
-		
+
 		// Load phonetic information as notes
 		phoneticFile := filepath.Join(wordDir, "phonetic.txt")
 		if data, err := os.ReadFile(phoneticFile); err == nil {
@@ -214,13 +237,13 @@ func (g *Generator) GenerateFromDirectory(dir string) error {
 			notes := strings.TrimSpace(string(data))
 			card.Notes = strings.ReplaceAll(notes, "\n", "<br>")
 		}
-		
+
 		// Only add card if it has at least some content
 		if card.AudioFile != "" || card.ImageFile != "" || card.Translation != "" {
 			g.AddCard(card)
 		}
 	}
-	
+
 	return nil
 }
 
diff --git a/internal/batch/processor.go b/internal/batch/processor.go
index 0b20179..6867c3c 100644
--- a/internal/batch/processor.go
+++ b/internal/batch/processor.go
@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"os"
 	"strings"
+
+	"codeberg.org/snonux/totalrecall/internal"
 )
 
 // WordEntry represents a word with optional translation
@@ -12,6 +14,8 @@ type WordEntry struct {
 	Translation string
 	// NeedsTranslation indicates if translation from English to Bulgarian is needed
 	NeedsTranslation bool
+	// CardType indicates whether this is en-bg or bg-bg card
+	CardType internal.CardType
 }
 
 // ReadBatchFile reads words from a file and returns WordEntry slice
@@ -19,6 +23,7 @@ type WordEntry struct {
 // - Bulgarian word only: "ябълка" (will be translated to English)
 // - With translation: "ябълка = apple" (both provided, no translation needed)
 // - English only: "= apple" (will be translated to Bulgarian)
+// - Bulgarian-Bulgarian: "word1 == definition" (bg-bg card, double equals)
 func ReadBatchFile(filename string) ([]WordEntry, error) {
 	content, err := os.ReadFile(filename)
 	if err != nil {
@@ -30,42 +35,72 @@ func ReadBatchFile(filename string) ([]WordEntry, error) {
 
 	for _, line := range splitLines(lines) {
 		if line = trimSpace(line); line != "" {
-			// Check if line contains '=' for translation format
-			if strings.Contains(line, "=") {
-				parts := strings.SplitN(line, "=", 2)
-				if len(parts) == 2 {
-					bulgarian := strings.TrimSpace(parts[0])
-					english := strings.TrimSpace(parts[1])
-
-					if bulgarian == "" && english != "" {
-						// Format: "= ENGLISH" - need to translate English to Bulgarian
-						entries = append(entries, WordEntry{
-							Bulgarian:        "", // Will be filled by translation
-							Translation:      english,
-							NeedsTranslation: true,
-						})
-					} else if bulgarian != "" && english != "" {
-						// Format: "BULGARIAN = ENGLISH" - both provided
-						entries = append(entries, WordEntry{
-							Bulgarian:        bulgarian,
-							Translation:      english,
-							NeedsTranslation: false,
-						})
-					}
-					// Ignore lines with empty English part
+			entry := parseBatchLine(line)
+			if entry != nil {
+				entries = append(entries, *entry)
+			}
+		}
+	}
+
+	return entries, nil
+}
+
+// parseBatchLine parses a single batch file line and returns the appropriate WordEntry
+func parseBatchLine(line string) *WordEntry {
+	// Check for Bulgarian-Bulgarian format first (double equals ==)
+	if strings.Contains(line, "==") {
+		parts := strings.SplitN(line, "==", 2)
+		if len(parts) == 2 {
+			bulgarian1 := strings.TrimSpace(parts[0])
+			bulgarian2 := strings.TrimSpace(parts[1])
+
+			if bulgarian1 != "" && bulgarian2 != "" {
+				return &WordEntry{
+					Bulgarian:        bulgarian1,
+					Translation:      bulgarian2,
+					NeedsTranslation: false,
+					CardType:         internal.CardTypeBgBg,
 				}
-			} else {
-				// Just a Bulgarian word - needs translation to English
-				entries = append(entries, WordEntry{
-					Bulgarian:        line,
-					Translation:      "",
+			}
+		}
+		return nil
+	}
+
+	// Check for English-Bulgarian format (single equals =)
+	if strings.Contains(line, "=") {
+		parts := strings.SplitN(line, "=", 2)
+		if len(parts) == 2 {
+			bulgarian := strings.TrimSpace(parts[0])
+			english := strings.TrimSpace(parts[1])
+
+			if bulgarian == "" && english != "" {
+				// Format: "= ENGLISH" - need to translate English to Bulgarian
+				return &WordEntry{
+					Bulgarian:        "",
+					Translation:      english,
+					NeedsTranslation: true,
+					CardType:         internal.CardTypeEnBg,
+				}
+			} else if bulgarian != "" && english != "" {
+				// Format: "BULGARIAN = ENGLISH" - both provided
+				return &WordEntry{
+					Bulgarian:        bulgarian,
+					Translation:      english,
 					NeedsTranslation: false,
-				})
+					CardType:         internal.CardTypeEnBg,
+				}
 			}
 		}
+		return nil
 	}
 
-	return entries, nil
+	// Just a Bulgarian word - needs translation to English
+	return &WordEntry{
+		Bulgarian:        line,
+		Translation:      "",
+		NeedsTranslation: false,
+		CardType:         internal.CardTypeEnBg,
+	}
 }
 
 // splitLines splits a string by newlines
diff --git a/internal/batch/processor_test.go b/internal/batch/processor_test.go
index fd9065b..fc4f7b0 100644
--- a/internal/batch/processor_test.go
+++ b/internal/batch/processor_test.go
@@ -5,6 +5,8 @@ import (
 	"path/filepath"
 	"reflect"
 	"testing"
+
+	"codeberg.org/snonux/totalrecall/internal"
 )
 
 func TestReadBatchFile(t *testing.T) {
@@ -30,9 +32,9 @@ func TestReadBatchFile(t *testing.T) {
 котка = cat
 куче = dog`,
 			want: []WordEntry{
-				{Bulgarian: "ябълка", Translation: "apple", NeedsTranslation: false},
-				{Bulgarian: "котка", Translation: "cat", NeedsTranslation: false},
-				{Bulgarian: "куче", Translation: "dog", NeedsTranslation: false},
+				{Bulgarian: "ябълка", Translation: "apple", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "котка", Translation: "cat", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "куче", Translation: "dog", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
 			},
 		},
 		{
@@ -42,10 +44,10 @@ func TestReadBatchFile(t *testing.T) {
 куче
 хляб = bread`,
 			want: []WordEntry{
-				{Bulgarian: "ябълка", Translation: "", NeedsTranslation: false},
-				{Bulgarian: "котка", Translation: "cat", NeedsTranslation: false},
-				{Bulgarian: "куче", Translation: "", NeedsTranslation: false},
-				{Bulgarian: "хляб", Translation: "bread", NeedsTranslation: false},
+				{Bulgarian: "ябълка", Translation: "", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "котка", Translation: "cat", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "куче", Translation: "", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "хляб", Translation: "bread", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
 			},
 		},
 		{
@@ -59,25 +61,25 @@ func TestReadBatchFile(t *testing.T) {
 
 `,
 			want: []WordEntry{
-				{Bulgarian: "ябълка", Translation: "", NeedsTranslation: false},
-				{Bulgarian: "котка", Translation: "cat", NeedsTranslation: false},
-				{Bulgarian: "куче", Translation: "", NeedsTranslation: false},
+				{Bulgarian: "ябълка", Translation: "", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "котка", Translation: "cat", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "куче", Translation: "", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
 			},
 		},
 		{
 			name:        "windows line endings",
 			fileContent: "ябълка\r\nкотка = cat\r\nкуче",
 			want: []WordEntry{
-				{Bulgarian: "ябълка", Translation: "", NeedsTranslation: false},
-				{Bulgarian: "котка", Translation: "cat", NeedsTranslation: false},
-				{Bulgarian: "куче", Translation: "", NeedsTranslation: false},
+				{Bulgarian: "ябълка", Translation: "", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "котка", Translation: "cat", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "куче", Translation: "", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
 			},
 		},
 		{
 			name:        "multiple equals signs",
 			fileContent: `test = word = with = equals`,
 			want: []WordEntry{
-				{Bulgarian: "test", Translation: "word = with = equals", NeedsTranslation: false},
+				{Bulgarian: "test", Translation: "word = with = equals", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
 			},
 		},
 		{
@@ -86,9 +88,9 @@ func TestReadBatchFile(t *testing.T) {
 = cat
 = dog`,
 			want: []WordEntry{
-				{Bulgarian: "", Translation: "apple", NeedsTranslation: true},
-				{Bulgarian: "", Translation: "cat", NeedsTranslation: true},
-				{Bulgarian: "", Translation: "dog", NeedsTranslation: true},
+				{Bulgarian: "", Translation: "apple", NeedsTranslation: true, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "", Translation: "cat", NeedsTranslation: true, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "", Translation: "dog", NeedsTranslation: true, CardType: internal.CardTypeEnBg},
 			},
 		},
 		{
@@ -100,12 +102,34 @@ func TestReadBatchFile(t *testing.T) {
 = table
 стол`,
 			want: []WordEntry{
-				{Bulgarian: "ябълка", Translation: "", NeedsTranslation: false},
-				{Bulgarian: "котка", Translation: "cat", NeedsTranslation: false},
-				{Bulgarian: "", Translation: "dog", NeedsTranslation: true},
-				{Bulgarian: "хляб", Translation: "bread", NeedsTranslation: false},
-				{Bulgarian: "", Translation: "table", NeedsTranslation: true},
-				{Bulgarian: "стол", Translation: "", NeedsTranslation: false},
+				{Bulgarian: "ябълка", Translation: "", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "котка", Translation: "cat", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "", Translation: "dog", NeedsTranslation: true, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "хляб", Translation: "bread", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "", Translation: "table", NeedsTranslation: true, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "стол", Translation: "", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
+			},
+		},
+		{
+			name: "bulgarian-bulgarian format with double equals",
+			fileContent: `ябълка == плод
+котка == домашно животно`,
+			want: []WordEntry{
+				{Bulgarian: "ябълка", Translation: "плод", NeedsTranslation: false, CardType: internal.CardTypeBgBg},
+				{Bulgarian: "котка", Translation: "домашно животно", NeedsTranslation: false, CardType: internal.CardTypeBgBg},
+			},
+		},
+		{
+			name: "mixed en-bg and bg-bg formats",
+			fileContent: `ябълка = apple
+котка == домашно животно
+куче = dog
+вода == течност`,
+			want: []WordEntry{
+				{Bulgarian: "ябълка", Translation: "apple", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "котка", Translation: "домашно животно", NeedsTranslation: false, CardType: internal.CardTypeBgBg},
+				{Bulgarian: "куче", Translation: "dog", NeedsTranslation: false, CardType: internal.CardTypeEnBg},
+				{Bulgarian: "вода", Translation: "течност", NeedsTranslation: false, CardType: internal.CardTypeBgBg},
 			},
 		},
 	}
diff --git a/internal/cardtype.go b/internal/cardtype.go
new file mode 100644
i