Add custom word entry + language pair support for learning units

- New UnitBuilder component with language pair selector (DE⇄EN, ES, FR, etc.)
- Manual word entry form with auto-suggest from Kaikki dictionary (6M words)
- "No results" prompt to add multi-word terms (e.g. "schottisches Hochland")
- New backend endpoint GET /vocabulary/lookup-translation (any→any via EN hub)
- Updated POST /vocabulary/units: accepts custom_words + source_lang/target_lang
- Split unit endpoints into vocabulary/unit_api.py (500 LOC budget)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend-lehrer/main.py

@@ -119,6 +119,10 @@ app.include_router(progress_router, prefix="/api")
 from vocabulary.api import router as vocabulary_router
 app.include_router(vocabulary_router, prefix="/api")
 
+# --- 4c2. Vocabulary Unit Creation + Translation ---
+from vocabulary.unit_api import router as vocab_unit_router
+app.include_router(vocab_unit_router, prefix="/api")
+
 # --- 4d. User Language Preferences ---
 from api.user_language import router as user_language_router
 app.include_router(user_language_router, prefix="/api")

backend-lehrer/vocabulary/api.py

@@ -22,11 +22,6 @@ from .db import (
     get_all_pos,
     VocabularyWord,
 )
-from units.learning import (
-    LearningUnitCreate,
-    create_learning_unit,
-    get_learning_unit,
-)
 
 logger = logging.getLogger(__name__)
 
@@ -239,130 +234,7 @@ async def api_tts(text: str = Query("", min_length=1), lang: str = Query("de")):
 # ---------------------------------------------------------------------------
 
 
-class CreateUnitFromWordsPayload(BaseModel):
-    title: str
-    word_ids: List[str]
-    grade: Optional[str] = None
-    language: Optional[str] = "de"
-
-
-@router.post("/units")
-async def api_create_unit_from_words(payload: CreateUnitFromWordsPayload):
-    """Create a learning unit from selected vocabulary word IDs.
-
-    Fetches full word details, creates a LearningUnit in the
-    learning_units system, and stores the vocabulary data.
-    """
-    if not payload.word_ids:
-        raise HTTPException(status_code=400, detail="Keine Woerter ausgewaehlt")
-
-    # Fetch all selected words
-    words = []
-    for wid in payload.word_ids:
-        word = await get_word(wid)
-        if word:
-            words.append(word)
-
-    if not words:
-        raise HTTPException(status_code=404, detail="Keine der Woerter gefunden")
-
-    # Create learning unit
-    lu = create_learning_unit(LearningUnitCreate(
-        title=payload.title,
-        topic="Vocabulary",
-        grade_level=payload.grade or "5-8",
-        language=payload.language or "de",
-        status="raw",
-    ))
-
-    # Save vocabulary data as analysis JSON for generators
-    import os
-    analysis_dir = os.path.expanduser("~/Arbeitsblaetter/Lerneinheiten")
-    os.makedirs(analysis_dir, exist_ok=True)
-
-    vocab_data = [w.to_dict() for w in words]
-    analysis_path = os.path.join(analysis_dir, f"{lu.id}_vocab.json")
-    with open(analysis_path, "w", encoding="utf-8") as f:
-        json.dump({"words": vocab_data, "title": payload.title}, f, ensure_ascii=False, indent=2)
-
-    # Also save as QA items for flashcards/type trainer
-    qa_items = []
-    for i, w in enumerate(words):
-        qa_items.append({
-            "id": f"qa_{i+1}",
-            "question": w.english,
-            "answer": w.german,
-            "question_type": "knowledge",
-            "key_terms": [w.english],
-            "difficulty": w.difficulty,
-            "source_hint": w.part_of_speech,
-            "leitner_box": 0,
-            "correct_count": 0,
-            "incorrect_count": 0,
-            "last_seen": None,
-            "next_review": None,
-            # Extra fields for enhanced flashcards
-            "ipa_en": w.ipa_en,
-            "ipa_de": w.ipa_de,
-            "syllables_en": w.syllables_en,
-            "syllables_de": w.syllables_de,
-            "example_en": w.example_en,
-            "example_de": w.example_de,
-            "image_url": w.image_url,
-            "audio_url_en": w.audio_url_en,
-            "audio_url_de": w.audio_url_de,
-            "part_of_speech": w.part_of_speech,
-            "translations": w.translations,
-        })
-
-    qa_path = os.path.join(analysis_dir, f"{lu.id}_qa.json")
-    with open(qa_path, "w", encoding="utf-8") as f:
-        json.dump({
-            "qa_items": qa_items,
-            "metadata": {
-                "subject": "English Vocabulary",
-                "grade_level": payload.grade or "5-8",
-                "source_title": payload.title,
-                "total_questions": len(qa_items),
-            },
-        }, f, ensure_ascii=False, indent=2)
-
-    # Auto-enrich words with images (Wikipedia + emoji fallback)
-    try:
-        from services.image_service import enrich_words_with_images
-        await enrich_words_with_images(payload.word_ids)
-    except Exception as e:
-        logger.warning(f"Image enrichment failed (non-critical): {e}")
-
-    logger.info(f"Created vocab unit {lu.id} with {len(words)} words")
-
-    return {
-        "unit_id": lu.id,
-        "title": payload.title,
-        "word_count": len(words),
-        "status": "created",
-    }
-
-
-@router.get("/units/{unit_id}")
-async def api_get_unit_words(unit_id: str):
-    """Get all words for a learning unit."""
-    import os
-    vocab_path = os.path.join(
-        os.path.expanduser("~/Arbeitsblaetter/Lerneinheiten"),
-        f"{unit_id}_vocab.json",
-    )
-    if not os.path.exists(vocab_path):
-        raise HTTPException(status_code=404, detail="Unit nicht gefunden")
-
-    with open(vocab_path, "r", encoding="utf-8") as f:
-        data = json.load(f)
-
-    return {
-        "unit_id": unit_id,
-        "title": data.get("title", ""),
-        "words": data.get("words", []),
-    }
+# Unit creation and translation lookup moved to vocabulary/unit_api.py
 
 
 # ---------------------------------------------------------------------------

backend-lehrer/vocabulary/unit_api.py

@@ -0,0 +1,356 @@
+"""
+Vocabulary Unit API — Create learning units, translate words, manage language pairs.
+
+Endpoints for teachers to build vocabulary learning units with custom words,
+auto-translation via Kaikki dictionary, and flexible language pair support.
+"""
+
+import json
+import logging
+import os
+from typing import Any, Dict, List, Optional
+
+from fastapi import APIRouter, HTTPException, Query
+from pydantic import BaseModel
+
+from .db import get_word, VocabularyWord, get_pool
+from units.learning import LearningUnitCreate, create_learning_unit
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter(prefix="/vocabulary", tags=["vocabulary"])
+
+# All supported language codes
+SUPPORTED_LANGS = {
+    "en", "de", "fr", "es", "it", "pt", "nl", "tr", "ru", "ar",
+    "uk", "pl", "sv", "fi", "da", "ro", "el", "hu", "cs", "bg",
+    "lv", "lt", "sk", "et", "sl", "hr",
+}
+
+
+# ---------------------------------------------------------------------------
+# Translation Lookup (auto-suggest)
+# ---------------------------------------------------------------------------
+
+
+@router.get("/lookup-translation")
+async def api_lookup_translation(
+    word: str = Query("", min_length=1, description="Word to translate"),
+    source: str = Query("en", description="Source language code"),
+    target: str = Query("de", description="Target language code"),
+    limit: int = Query(5, ge=1, le=20),
+):
+    """Look up translations between any two languages via Kaikki dictionary.
+
+    Uses EN entries as a hub: all EN words have translations to 24 languages.
+    - EN → X: direct lookup (word in EN, translation from JSONB)
+    - X → EN: reverse lookup (search EN entries where translations.X matches)
+    - X → Y: bridge via EN (find EN word via X, then get Y translation)
+    """
+    if source not in SUPPORTED_LANGS or target not in SUPPORTED_LANGS:
+        raise HTTPException(status_code=400, detail="Sprache nicht unterstuetzt")
+    if source == target:
+        return {"results": [], "word": word, "source": source, "target": target}
+
+    pool = await get_pool()
+    q = word.strip()
+    results = []
+
+    async with pool.acquire() as conn:
+        if source == "en":
+            # Direct: search EN word, return target translation
+            rows = await conn.fetch(
+                """SELECT word, pos, ipa, translations
+                   FROM vocabulary_kaikki
+                   WHERE lang = 'en' AND lower(word) LIKE $1
+                   ORDER BY length(word), lower(word)
+                   LIMIT $2""",
+                f"{q.lower()}%", limit,
+            )
+            for r in rows:
+                tr = _parse_translations(r["translations"])
+                target_text = tr.get(target, {}).get("text", "")
+                if target_text:
+                    results.append({
+                        "source_text": r["word"],
+                        "target_text": target_text,
+                        "pos": r["pos"],
+                        "ipa": r["ipa"] or "",
+                    })
+
+        elif target == "en":
+            # Reverse: search EN entries where translations.source matches
+            rows = await conn.fetch(
+                """SELECT word, pos, ipa, translations->'%s'->>'text' as src_text
+                   FROM vocabulary_kaikki
+                   WHERE lang = 'en'
+                     AND translations->'%s'->>'text' ILIKE $1
+                   ORDER BY length(word)
+                   LIMIT $2""" % (source, source),
+                f"{q}%", limit,
+            )
+            for r in rows:
+                results.append({
+                    "source_text": r["src_text"],
+                    "target_text": r["word"],
+                    "pos": r["pos"],
+                    "ipa": r["ipa"] or "",
+                })
+
+        else:
+            # Bridge via EN: find EN word via source, then get target translation
+            rows = await conn.fetch(
+                """SELECT word, pos, ipa, translations
+                   FROM vocabulary_kaikki
+                   WHERE lang = 'en'
+                     AND translations->'%s'->>'text' ILIKE $1
+                   ORDER BY length(word)
+                   LIMIT $2""" % source,
+                f"{q}%", limit,
+            )
+            for r in rows:
+                tr = _parse_translations(r["translations"])
+                src_text = tr.get(source, {}).get("text", "")
+                target_text = tr.get(target, {}).get("text", "")
+                if src_text and target_text:
+                    results.append({
+                        "source_text": src_text,
+                        "target_text": target_text,
+                        "pos": r["pos"],
+                        "ipa": "",
+                    })
+
+    return {"results": results, "word": q, "source": source, "target": target}
+
+
+def _parse_translations(tr) -> dict:
+    """Parse translations field (may be JSONB dict or JSON string)."""
+    if isinstance(tr, str):
+        return json.loads(tr)
+    return tr or {}
+
+
+# ---------------------------------------------------------------------------
+# Unit Creation (with custom words + language pair)
+# ---------------------------------------------------------------------------
+
+
+class CustomWord(BaseModel):
+    source_text: str
+    target_text: str
+
+
+class CreateUnitPayload(BaseModel):
+    title: str
+    word_ids: List[str] = []
+    custom_words: List[CustomWord] = []
+    source_lang: str = "en"
+    target_lang: str = "de"
+    grade: Optional[str] = None
+
+
+@router.post("/units")
+async def api_create_unit_from_words(payload: CreateUnitPayload):
+    """Create a learning unit from dictionary words and/or custom word pairs.
+
+    Supports any language pair. Words can come from:
+    1. word_ids — looked up in Kaikki dictionary
+    2. custom_words — manually entered source/target pairs
+    """
+    if not payload.word_ids and not payload.custom_words:
+        raise HTTPException(status_code=400, detail="Keine Woerter ausgewaehlt")
+
+    qa_items = []
+    vocab_data = []
+    idx = 0
+
+    # 1. Process dictionary words
+    for wid in payload.word_ids:
+        word = await get_word(wid)
+        if not word:
+            # Try Kaikki lookup
+            kaikki_word = await _get_kaikki_word(wid, payload.source_lang, payload.target_lang)
+            if kaikki_word:
+                qa_items.append(_make_qa_item(idx, kaikki_word, payload.source_lang, payload.target_lang))
+                vocab_data.append(kaikki_word)
+                idx += 1
+            continue
+        # Manual vocabulary_words entry
+        source_text, target_text = _get_word_pair(word, payload.source_lang, payload.target_lang)
+        qa_items.append({
+            "id": f"qa_{idx+1}",
+            "question": source_text,
+            "answer": target_text,
+            "question_type": "knowledge",
+            "key_terms": [source_text],
+            "difficulty": word.difficulty,
+            "source_hint": word.part_of_speech,
+            "leitner_box": 0,
+            "correct_count": 0,
+            "incorrect_count": 0,
+            "last_seen": None,
+            "next_review": None,
+            "ipa_en": word.ipa_en,
+            "ipa_de": word.ipa_de,
+            "syllables_en": word.syllables_en,
+            "syllables_de": word.syllables_de,
+            "example_en": word.example_en,
+            "example_de": word.example_de,
+            "image_url": word.image_url,
+            "audio_url_en": word.audio_url_en,
+            "audio_url_de": word.audio_url_de,
+            "part_of_speech": word.part_of_speech,
+            "translations": word.translations,
+        })
+        vocab_data.append(word.to_dict())
+        idx += 1
+
+    # 2. Process custom words (manually entered by teacher)
+    for cw in payload.custom_words:
+        qa_items.append({
+            "id": f"qa_{idx+1}",
+            "question": cw.source_text,
+            "answer": cw.target_text,
+            "question_type": "knowledge",
+            "key_terms": [cw.source_text],
+            "difficulty": 1,
+            "source_hint": "",
+            "leitner_box": 0,
+            "correct_count": 0,
+            "incorrect_count": 0,
+            "last_seen": None,
+            "next_review": None,
+            "part_of_speech": "",
+            "translations": {},
+        })
+        vocab_data.append({
+            "english": cw.source_text if payload.source_lang == "en" else cw.target_text if payload.target_lang == "en" else "",
+            "german": cw.source_text if payload.source_lang == "de" else cw.target_text if payload.target_lang == "de" else "",
+            "word": cw.source_text,
+            "translation": cw.target_text,
+            "source_lang": payload.source_lang,
+            "target_lang": payload.target_lang,
+        })
+        idx += 1
+
+    if not qa_items:
+        raise HTTPException(status_code=400, detail="Keine gültigen Woerter")
+
+    # Create learning unit
+    lang_label = f"{payload.source_lang.upper()}→{payload.target_lang.upper()}"
+    lu = create_learning_unit(LearningUnitCreate(
+        title=payload.title,
+        topic="Vocabulary",
+        grade_level=payload.grade or "5-8",
+        language=payload.target_lang,
+        status="raw",
+    ))
+
+    # Save files
+    analysis_dir = os.path.expanduser("~/Arbeitsblaetter/Lerneinheiten")
+    os.makedirs(analysis_dir, exist_ok=True)
+
+    with open(os.path.join(analysis_dir, f"{lu.id}_vocab.json"), "w", encoding="utf-8") as f:
+        json.dump({"words": vocab_data, "title": payload.title}, f, ensure_ascii=False, indent=2)
+
+    with open(os.path.join(analysis_dir, f"{lu.id}_qa.json"), "w", encoding="utf-8") as f:
+        json.dump({
+            "qa_items": qa_items,
+            "metadata": {
+                "subject": f"Vocabulary {lang_label}",
+                "grade_level": payload.grade or "5-8",
+                "source_title": payload.title,
+                "total_questions": len(qa_items),
+                "source_lang": payload.source_lang,
+                "target_lang": payload.target_lang,
+            },
+        }, f, ensure_ascii=False, indent=2)
+
+    # Auto-enrich images for dictionary words
+    dict_ids = [wid for wid in payload.word_ids]
+    if dict_ids:
+        try:
+            from services.image_service import enrich_words_with_images
+            await enrich_words_with_images(dict_ids)
+        except Exception as e:
+            logger.warning(f"Image enrichment failed (non-critical): {e}")
+
+    logger.info(f"Created vocab unit {lu.id} ({lang_label}) with {len(qa_items)} words")
+    return {
+        "unit_id": lu.id,
+        "title": payload.title,
+        "word_count": len(qa_items),
+        "source_lang": payload.source_lang,
+        "target_lang": payload.target_lang,
+        "status": "created",
+    }
+
+
+def _get_word_pair(word: VocabularyWord, source_lang: str, target_lang: str):
+    """Extract source/target text from a VocabularyWord for the given language pair."""
+    lang_map = {"en": word.english, "de": word.german}
+    # Check translations for other languages
+    if source_lang not in lang_map:
+        tr = word.translations or {}
+        lang_map[source_lang] = tr.get(source_lang, {}).get("text", word.english)
+    if target_lang not in lang_map:
+        tr = word.translations or {}
+        lang_map[target_lang] = tr.get(target_lang, {}).get("text", word.german)
+    return lang_map.get(source_lang, word.english), lang_map.get(target_lang, word.german)
+
+
+async def _get_kaikki_word(word_id: str, source_lang: str, target_lang: str) -> Optional[dict]:
+    """Look up a word by ID in the Kaikki table and return a vocab dict."""
+    pool = await get_pool()
+    async with pool.acquire() as conn:
+        row = await conn.fetchrow(
+            "SELECT id, word, lang, pos, ipa, translations, example FROM vocabulary_kaikki WHERE id = $1",
+            _to_uuid(word_id),
+        )
+    if not row:
+        return None
+    tr = _parse_translations(row["translations"])
+    src = row["word"] if row["lang"] == source_lang else tr.get(source_lang, {}).get("text", "")
+    tgt = tr.get(target_lang, {}).get("text", "") if row["lang"] != target_lang else row["word"]
+    return {
+        "id": str(row["id"]),
+        "word": row["word"],
+        "lang": row["lang"],
+        "source_text": src or row["word"],
+        "target_text": tgt,
+        "pos": row["pos"],
+        "ipa": row["ipa"] or "",
+        "example": row["example"] or "",
+        "translations": tr,
+    }
+
+
+def _make_qa_item(idx: int, kw: dict, source_lang: str, target_lang: str) -> dict:
+    """Create a QA item from a Kaikki word dict."""
+    return {
+        "id": f"qa_{idx+1}",
+        "question": kw.get("source_text", kw.get("word", "")),
+        "answer": kw.get("target_text", ""),
+        "question_type": "knowledge",
+        "key_terms": [kw.get("source_text", kw.get("word", ""))],
+        "difficulty": 0,
+        "source_hint": kw.get("pos", ""),
+        "leitner_box": 0,
+        "correct_count": 0,
+        "incorrect_count": 0,
+        "last_seen": None,
+        "next_review": None,
+        "ipa_en": kw.get("ipa", "") if source_lang == "en" else "",
+        "ipa_de": kw.get("ipa", "") if source_lang == "de" else "",
+        "part_of_speech": kw.get("pos", ""),
+        "translations": kw.get("translations", {}),
+    }
+
+
+def _to_uuid(s: str):
+    """Convert string to UUID, return as-is if already valid."""
+    import uuid
+    try:
+        return uuid.UUID(s)
+    except (ValueError, AttributeError):
+        return s

studio-v2/app/vocabulary/components/UnitBuilder.tsx

@@ -0,0 +1,307 @@
+'use client'
+
+import React, { useState, useCallback, useRef, useEffect } from 'react'
+
+/** Supported language pairs */
+const LANGUAGES = [
+  { code: 'en', label: 'Englisch' },
+  { code: 'de', label: 'Deutsch' },
+  { code: 'fr', label: 'Franzoesisch' },
+  { code: 'es', label: 'Spanisch' },
+  { code: 'it', label: 'Italienisch' },
+  { code: 'pt', label: 'Portugiesisch' },
+  { code: 'nl', label: 'Niederlaendisch' },
+  { code: 'tr', label: 'Tuerkisch' },
+  { code: 'ru', label: 'Russisch' },
+  { code: 'ar', label: 'Arabisch' },
+  { code: 'uk', label: 'Ukrainisch' },
+  { code: 'pl', label: 'Polnisch' },
+  { code: 'sv', label: 'Schwedisch' },
+  { code: 'da', label: 'Daenisch' },
+  { code: 'fi', label: 'Finnisch' },
+  { code: 'el', label: 'Griechisch' },
+  { code: 'hu', label: 'Ungarisch' },
+  { code: 'cs', label: 'Tschechisch' },
+  { code: 'ro', label: 'Rumaenisch' },
+]
+
+export interface UnitWord {
+  id: string
+  source_text: string
+  target_text: string
+  pos?: string
+  is_custom?: boolean
+}
+
+interface Props {
+  isDark: boolean
+  glassCard: string
+  glassInput: string
+  selectedWords: UnitWord[]
+  onWordsChange: (words: UnitWord[]) => void
+  onCreateUnit: (title: string, sourceLang: string, targetLang: string) => void
+  isCreating: boolean
+  noSearchResults?: boolean
+  searchQuery?: string
+}
+
+export default function UnitBuilder({
+  isDark, glassCard, glassInput,
+  selectedWords, onWordsChange, onCreateUnit, isCreating,
+  noSearchResults, searchQuery,
+}: Props) {
+  const [unitTitle, setUnitTitle] = useState('')
+  const [sourceLang, setSourceLang] = useState('de')
+  const [targetLang, setTargetLang] = useState('en')
+  const [showManualEntry, setShowManualEntry] = useState(false)
+  const [manualSource, setManualSource] = useState('')
+  const [manualTarget, setManualTarget] = useState('')
+  const [suggestions, setSuggestions] = useState<{ source_text: string; target_text: string; pos?: string }[]>([])
+  const [isLookingUp, setIsLookingUp] = useState(false)
+  const debounceRef = useRef<ReturnType<typeof setTimeout>>()
+
+  // Auto-suggest translation when typing in source field
+  useEffect(() => {
+    if (!manualSource.trim() || manualSource.length < 2) {
+      setSuggestions([])
+      return
+    }
+    if (debounceRef.current) clearTimeout(debounceRef.current)
+    debounceRef.current = setTimeout(async () => {
+      setIsLookingUp(true)
+      try {
+        const resp = await fetch(
+          `/api/vocabulary/lookup-translation?word=${encodeURIComponent(manualSource)}&source=${sourceLang}&target=${targetLang}&limit=5`
+        )
+        if (resp.ok) {
+          const data = await resp.json()
+          setSuggestions(data.results || [])
+          // Auto-fill target if exactly one match
+          if (data.results?.length === 1 && !manualTarget) {
+            setManualTarget(data.results[0].target_text)
+          }
+        }
+      } catch { /* ignore */ }
+      setIsLookingUp(false)
+    }, 400)
+    return () => { if (debounceRef.current) clearTimeout(debounceRef.current) }
+  }, [manualSource, sourceLang, targetLang]) // eslint-disable-line react-hooks/exhaustive-deps
+
+  const addManualWord = useCallback(() => {
+    if (!manualSource.trim() || !manualTarget.trim()) return
+    const newWord: UnitWord = {
+      id: `custom_${Date.now()}_${Math.random().toString(36).slice(2, 6)}`,
+      source_text: manualSource.trim(),
+      target_text: manualTarget.trim(),
+      is_custom: true,
+    }
+    onWordsChange([...selectedWords, newWord])
+    setManualSource('')
+    setManualTarget('')
+    setSuggestions([])
+  }, [manualSource, manualTarget, selectedWords, onWordsChange])
+
+  const removeWord = useCallback((id: string) => {
+    onWordsChange(selectedWords.filter(w => w.id !== id))
+  }, [selectedWords, onWordsChange])
+
+  const swapLanguages = useCallback(() => {
+    setSourceLang(targetLang)
+    setTargetLang(sourceLang)
+  }, [sourceLang, targetLang])
+
+  const srcLabel = LANGUAGES.find(l => l.code === sourceLang)?.label || sourceLang.toUpperCase()
+  const tgtLabel = LANGUAGES.find(l => l.code === targetLang)?.label || targetLang.toUpperCase()
+
+  return (
+    <div className="w-80 flex-shrink-0">
+      <div className={`${glassCard} rounded-2xl p-5 sticky top-6`}>
+        <h3 className={`text-lg font-semibold mb-3 ${isDark ? 'text-white' : 'text-slate-900'}`}>
+          Lernunit erstellen
+        </h3>
+
+        {/* Language pair selector */}
+        <div className="flex items-center gap-2 mb-3">
+          <select
+            value={sourceLang}
+            onChange={e => setSourceLang(e.target.value)}
+            className={`flex-1 px-2 py-1.5 rounded-lg border text-xs ${glassInput}`}
+          >
+            {LANGUAGES.map(l => (
+              <option key={l.code} value={l.code}>{l.label}</option>
+            ))}
+          </select>
+          <button
+            onClick={swapLanguages}
+            className={`px-2 py-1.5 rounded-lg text-sm ${isDark ? 'bg-white/10 text-white/60 hover:bg-white/20' : 'bg-slate-100 text-slate-500 hover:bg-slate-200'}`}
+            title="Sprachen tauschen"
+          >
+            ⇄
+          </button>
+          <select
+            value={targetLang}
+            onChange={e => setTargetLang(e.target.value)}
+            className={`flex-1 px-2 py-1.5 rounded-lg border text-xs ${glassInput}`}
+          >
+            {LANGUAGES.map(l => (
+              <option key={l.code} value={l.code}>{l.label}</option>
+            ))}
+          </select>
+        </div>
+
+        <input
+          type="text"
+          value={unitTitle}
+          onChange={e => setUnitTitle(e.target.value)}
+          placeholder="Titel (z.B. Unit 3 - Food)"
+          className={`w-full px-4 py-2.5 rounded-xl border outline-none text-sm mb-3 ${glassInput}`}
+        />
+
+        {/* Manual word entry toggle */}
+        <button
+          onClick={() => setShowManualEntry(!showManualEntry)}
+          className={`w-full text-xs px-3 py-2 rounded-lg mb-3 flex items-center justify-center gap-1 ${
+            showManualEntry
+              ? isDark ? 'bg-blue-500/20 text-blue-300' : 'bg-blue-100 text-blue-700'
+              : isDark ? 'bg-white/10 text-white/60 hover:bg-white/15' : 'bg-slate-100 text-slate-600 hover:bg-slate-200'
+          }`}
+        >
+          {showManualEntry ? '▾ Eigene Woerter eingeben' : '▸ Eigene Woerter eingeben'}
+        </button>
+
+        {/* Manual entry form */}
+        {showManualEntry && (
+          <div className={`rounded-xl p-3 mb-3 ${isDark ? 'bg-white/5' : 'bg-slate-50'}`}>
+            <div className="space-y-2">
+              <div>
+                <label className={`text-xs ${isDark ? 'text-white/50' : 'text-slate-500'}`}>
+                  {srcLabel}
+                </label>
+                <input
+                  type="text"
+                  value={manualSource}
+                  onChange={e => setManualSource(e.target.value)}
+                  placeholder={`z.B. ${sourceLang === 'de' ? 'schottisches Hochland' : 'Scottish Highlands'}`}
+                  className={`w-full px-3 py-2 rounded-lg border outline-none text-sm ${glassInput}`}
+                  onKeyDown={e => e.key === 'Enter' && manualTarget && addManualWord()}
+                />
+              </div>
+              <div>
+                <label className={`text-xs ${isDark ? 'text-white/50' : 'text-slate-500'}`}>
+                  {tgtLabel} {isLookingUp && <span className="animate-pulse">...</span>}
+                </label>
+                <input
+                  type="text"
+                  value={manualTarget}
+                  onChange={e => setManualTarget(e.target.value)}
+                  placeholder={`z.B. ${targetLang === 'en' ? 'Scottish Highlands' : 'schottisches Hochland'}`}
+                  className={`w-full px-3 py-2 rounded-lg border outline-none text-sm ${glassInput}`}
+                  onKeyDown={e => e.key === 'Enter' && manualSource && addManualWord()}
+                />
+              </div>
+              {/* Auto-suggest results */}
+              {suggestions.length > 1 && (
+                <div className={`rounded-lg p-2 space-y-1 ${isDark ? 'bg-white/5' : 'bg-white'}`}>
+                  <span className={`text-xs ${isDark ? 'text-white/40' : 'text-slate-400'}`}>Vorschlaege:</span>
+                  {suggestions.map((s, i) => (
+                    <button
+                      key={i}
+                      onClick={() => {
+                        setManualSource(s.source_text)
+                        setManualTarget(s.target_text)
+                      }}
+                      className={`w-full text-left text-xs px-2 py-1 rounded ${isDark ? 'hover:bg-white/10 text-white/70' : 'hover:bg-slate-100 text-slate-700'}`}
+                    >
+                      {s.source_text} → {s.target_text} {s.pos && <span className={isDark ? 'text-white/30' : 'text-slate-400'}>({s.pos})</span>}
+                    </button>
+                  ))}
+                </div>
+              )}
+              <button
+                onClick={addManualWord}
+                disabled={!manualSource.trim() || !manualTarget.trim()}
+                className={`w-full py-2 rounded-lg text-sm font-medium ${
+                  manualSource.trim() && manualTarget.trim()
+                    ? isDark ? 'bg-green-500/20 text-green-300 hover:bg-green-500/30' : 'bg-green-100 text-green-700 hover:bg-green-200'
+                    : isDark ? 'bg-white/5 text-white/20' : 'bg-slate-100 text-slate-300'
+                }`}
+              >
+                + Hinzufuegen
+              </button>
+            </div>
+          </div>
+        )}
+
+        {/* "No results" prompt to add manually */}
+        {noSearchResults && searchQuery && !showManualEntry && (
+          <div className={`rounded-xl p-3 mb-3 text-center ${isDark ? 'bg-amber-500/10 border border-amber-500/20' : 'bg-amber-50 border border-amber-200'}`}>
+            <p className={`text-xs mb-2 ${isDark ? 'text-amber-300' : 'text-amber-700'}`}>
+              &quot;{searchQuery}&quot; nicht im Woerterbuch
+            </p>
+            <button
+              onClick={() => {
+                setShowManualEntry(true)
+                setManualSource(searchQuery)
+              }}
+              className={`text-xs px-3 py-1.5 rounded-lg font-medium ${isDark ? 'bg-amber-500/20 text-amber-200 hover:bg-amber-500/30' : 'bg-amber-100 text-amber-800 hover:bg-amber-200'}`}
+            >
+              Manuell hinzufuegen →
+            </button>
+          </div>
+        )}
+
+        {/* Word list */}
+        {selectedWords.length === 0 ? (
+          <p className={`text-sm text-center py-6 ${isDark ? 'text-white/40' : 'text-slate-400'}`}>
+            Woerter aus dem Woerterbuch auswaehlen oder eigene eingeben
+          </p>
+        ) : (
+          <div className="space-y-1.5 max-h-72 overflow-y-auto mb-3">
+            {selectedWords.map((w, i) => (
+              <div key={w.id} className={`flex items-center justify-between px-3 py-2 rounded-lg ${isDark ? 'bg-white/5' : 'bg-slate-50'}`}>
+                <div className="flex items-center gap-2 min-w-0 flex-1">
+                  <span className={`text-xs w-5 text-center flex-shrink-0 ${isDark ? 'text-white/30' : 'text-slate-400'}`}>{i+1}</span>
+                  <div className="min-w-0 flex-1">
+                    <span className={`text-sm font-medium truncate block ${isDark ? 'text-white' : 'text-slate-900'}`}>
+                      {w.source_text}
+                    </span>
+                    <span className={`text-xs truncate block ${isDark ? 'text-white/40' : 'text-slate-400'}`}>
+                      {w.target_text}
+                    </span>
+                  </div>
+                  {w.is_custom && (
+                    <span className={`text-xs px-1.5 py-0.5 rounded flex-shrink-0 ${isDark ? 'bg-green-500/20 text-green-400' : 'bg-green-100 text-green-600'}`}>
+                      eigen
+                    </span>
+                  )}
+                </div>
+                <button
+                  onClick={() => removeWord(w.id)}
+                  className={`text-xs ml-2 flex-shrink-0 ${isDark ? 'text-red-400 hover:text-red-300' : 'text-red-500 hover:text-red-700'}`}
+                >
+                  ✕
+                </button>
+              </div>
+            ))}
+          </div>
+        )}
+
+        <div className={`text-xs mb-3 ${isDark ? 'text-white/40' : 'text-slate-400'}`}>
+          {selectedWords.length} Woerter · {sourceLang.toUpperCase()} → {targetLang.toUpperCase()}
+        </div>
+
+        <button
+          onClick={() => onCreateUnit(unitTitle, sourceLang, targetLang)}
+          disabled={isCreating || selectedWords.length === 0 || !unitTitle.trim()}
+          className={`w-full py-3 rounded-xl font-medium transition-all ${
+            selectedWords.length > 0 && unitTitle.trim()
+              ? 'bg-gradient-to-r from-blue-500 to-cyan-500 text-white hover:shadow-lg'
+              : isDark ? 'bg-white/5 text-white/30' : 'bg-slate-100 text-slate-400'
+          }`}
+        >
+          {isCreating ? 'Wird erstellt...' : 'Lernunit starten'}
+        </button>
+      </div>
+    </div>
+  )
+}

studio-v2/app/vocabulary/page.tsx

@@ -5,11 +5,14 @@ import { useRouter } from 'next/navigation'
 import { useTheme } from '@/lib/ThemeContext'
 import { Sidebar } from '@/components/Sidebar'
 import { AudioButton } from '@/components/learn/AudioButton'
+import UnitBuilder, { type UnitWord } from './components/UnitBuilder'
 
 interface VocabWord {
   id: string
   english: string
   german: string
+  word?: string
+  lang?: string
   ipa_en: string
   ipa_de: string
   part_of_speech: string
@@ -20,11 +23,18 @@ interface VocabWord {
   image_url: string
   difficulty: number
   tags: string[]
+  translations?: Record<string, any>
 }
 
-/** Use Next.js API proxy to avoid mixed-content/CORS issues */
-function getApiBase() {
-  return ''  // Same-origin: /api/vocabulary/... proxied by Next.js
+function vocabToUnit(w: VocabWord, searchLang: string): UnitWord {
+  // Source = the word in the language we searched, Target = the translation
+  const src = w.word || w.english || ''
+  const tgt = searchLang === 'en'
+    ? (w.german || '')
+    : searchLang === 'de'
+      ? (w.english || '')
+      : (w.english || w.german || '')
+  return { id: w.id, source_text: src, target_text: tgt, pos: w.part_of_speech }
 }
 
 export default function VocabularyPage() {
@@ -39,11 +49,9 @@ export default function VocabularyPage() {
   const [diffFilter, setDiffFilter] = useState(0)
   const [searchLang, setSearchLang] = useState('en')
   const [topics, setTopics] = useState<{ topic: string; words: string[]; display_words?: string[]; word_count: number }[]>([])
-  const [showTopics, setShowTopics] = useState(false)
 
-  // Unit builder
-  const [selectedWords, setSelectedWords] = useState<VocabWord[]>([])
-  const [unitTitle, setUnitTitle] = useState('')
+  // Unit builder state (UnitWord format)
+  const [unitWords, setUnitWords] = useState<UnitWord[]>([])
   const [isCreating, setIsCreating] = useState(false)
 
   const glassCard = isDark
@@ -54,9 +62,8 @@ export default function VocabularyPage() {
     ? 'bg-white/10 border-white/20 text-white placeholder-white/40'
     : 'bg-white border-slate-200 text-slate-900 placeholder-slate-400'
 
-  // Load filters on mount
   useEffect(() => {
-    fetch(`${getApiBase()}/api/vocabulary/filters`)
+    fetch('/api/vocabulary/filters')
       .then(r => r.ok ? r.json() : null)
       .then(d => { if (d) setFilters(d) })
       .catch(() => {})
@@ -66,30 +73,28 @@ export default function VocabularyPage() {
   useEffect(() => {
     if (!query.trim() && !posFilter && !diffFilter) {
       setResults([])
+      setTopics([])
       return
     }
-
     const timer = setTimeout(async () => {
       setIsSearching(true)
       try {
         let url: string
         if (query.trim()) {
-          url = `${getApiBase()}/api/vocabulary/search?q=${encodeURIComponent(query)}&lang=${searchLang}&limit=30&source=kaikki`
+          url = `/api/vocabulary/search?q=${encodeURIComponent(query)}&lang=${searchLang}&limit=30&source=kaikki`
         } else {
           const params = new URLSearchParams({ limit: '30' })
           if (posFilter) params.set('pos', posFilter)
           if (diffFilter) params.set('difficulty', String(diffFilter))
-          url = `${getApiBase()}/api/vocabulary/browse?${params}`
+          url = `/api/vocabulary/browse?${params}`
         }
         const resp = await fetch(url)
         if (resp.ok) {
           const data = await resp.json()
           setResults(data.words || [])
         }
-
-        // Also search for matching topics
         if (query.trim()) {
-          const topicResp = await fetch(`${getApiBase()}/api/vocabulary/topics?q=${encodeURIComponent(query)}&lang=${searchLang}`)
+          const topicResp = await fetch(`/api/vocabulary/topics?q=${encodeURIComponent(query)}&lang=${searchLang}`)
           if (topicResp.ok) {
             const topicData = await topicResp.json()
             setTopics(topicData.topics || [])
@@ -101,28 +106,38 @@ export default function VocabularyPage() {
         setIsSearching(false)
       }
     }, 300)
-
     return () => clearTimeout(timer)
   }, [query, posFilter, diffFilter, searchLang])
 
   const toggleWord = useCallback((word: VocabWord) => {
-    setSelectedWords(prev => {
+    setUnitWords(prev => {
       const exists = prev.find(w => w.id === word.id)
       if (exists) return prev.filter(w => w.id !== word.id)
-      return [...prev, word]
+      return [...prev, vocabToUnit(word, searchLang)]
     })
-  }, [])
+  }, [searchLang])
 
-  const createUnit = useCallback(async () => {
-    if (!unitTitle.trim() || selectedWords.length === 0) return
+  const isSelected = (wordId: string) => unitWords.some(w => w.id === wordId)
+
+  const createUnit = useCallback(async (title: string, sourceLang: string, targetLang: string) => {
+    if (!title.trim() || unitWords.length === 0) return
     setIsCreating(true)
     try {
-      const resp = await fetch(`${getApiBase()}/api/vocabulary/units`, {
+      const dictWords = unitWords.filter(w => !w.is_custom)
+      const customWords = unitWords.filter(w => w.is_custom)
+
+      const resp = await fetch('/api/vocabulary/units', {
         method: 'POST',
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify({
-          title: unitTitle,
-          word_ids: selectedWords.map(w => w.id),
+          title,
+          word_ids: dictWords.map(w => w.id),
+          custom_words: customWords.map(w => ({
+            source_text: w.source_text,
+            target_text: w.target_text,
+          })),
+          source_lang: sourceLang,
+          target_lang: targetLang,
         }),
       })
       if (resp.ok) {
@@ -134,9 +149,29 @@ export default function VocabularyPage() {
     } finally {
       setIsCreating(false)
     }
-  }, [unitTitle, selectedWords, router])
+  }, [unitWords, router])
 
-  const isSelected = (wordId: string) => selectedWords.some(w => w.id === wordId)
+  const addTopicWords = useCallback(async (topic: { words: string[] }, showOnly: boolean) => {
+    setIsSearching(true)
+    const topicWords: VocabWord[] = []
+    for (const w of topic.words) {
+      const r = await fetch(`/api/vocabulary/search?q=${encodeURIComponent(w)}&lang=en&limit=1&source=kaikki`)
+      if (r.ok) {
+        const d = await r.json()
+        if (d.words?.[0]) topicWords.push(d.words[0])
+      }
+    }
+    if (!showOnly) {
+      const newUnitWords = topicWords
+        .filter(tw => !unitWords.find(uw => uw.id === tw.id))
+        .map(tw => vocabToUnit(tw, 'en'))
+      setUnitWords(prev => [...prev, ...newUnitWords])
+    }
+    setResults(topicWords)
+    setIsSearching(false)
+  }, [unitWords])
+
+  const noSearchResults = !isSearching && results.length === 0 && !!query.trim() && topics.length === 0
 
   return (
     <div className={`min-h-screen flex relative overflow-hidden ${
@@ -157,7 +192,7 @@ export default function VocabularyPage() {
               <div>
                 <h1 className={`text-xl font-bold ${isDark ? 'text-white' : 'text-slate-900'}`}>Woerterbuch</h1>
                 <p className={`text-sm ${isDark ? 'text-white/60' : 'text-slate-500'}`}>
-                  {(filters as any).kaikki_total > 0 ? `${((filters as any).kaikki_total as number).toLocaleString()} Woerter in ${(filters as any).kaikki_languages} Sprachen` : filters.total_words > 0 ? `${filters.total_words.toLocaleString()} Woerter` : 'Woerter suchen und Lernunits erstellen'}
+                  {(filters as any).kaikki_total > 0 ? `${((filters as any).kaikki_total as number).toLocaleString()} Woerter in ${(filters as any).kaikki_languages} Sprachen` : 'Woerter suchen und Lernunits erstellen'}
                 </p>
               </div>
             </div>
@@ -184,18 +219,6 @@ export default function VocabularyPage() {
                   <option value="ar">AR</option>
                   <option value="uk">UK</option>
                   <option value="pl">PL</option>
-                  <option value="sv">SV</option>
-                  <option value="fi">FI</option>
-                  <option value="da">DA</option>
-                  <option value="ro">RO</option>
-                  <option value="el">EL</option>
-                  <option value="hu">HU</option>
-                  <option value="cs">CS</option>
-                  <option value="bg">BG</option>
-                  <option value="lv">LV</option>
-                  <option value="lt">LT</option>
-                  <option value="sk">SK</option>
-                  <option value="et">ET</option>
                 </select>
                 <input
                   type="text"
@@ -205,24 +228,9 @@ export default function VocabularyPage() {
                   className={`flex-1 px-4 py-3 rounded-xl border outline-none text-lg ${glassInput}`}
                   autoFocus
                 />
-                <select value={posFilter} onChange={e => setPosFilter(e.target.value)}
-                  className={`px-3 py-2 rounded-xl border text-sm ${glassInput}`}>
-                  <option value="">Alle Wortarten</option>
-                  {filters.parts_of_speech.map(p => <option key={p} value={p}>{p}</option>)}
-                </select>
-                <select value={diffFilter} onChange={e => setDiffFilter(Number(e.target.value))}
-                  className={`px-3 py-2 rounded-xl border text-sm ${glassInput}`}>
-                  <option value={0}>Alle Level</option>
-                  <option value={1}>A1</option>
-                  <option value={2}>A2</option>
-                  <option value={3}>B1</option>
-                  <option value={4}>B2</option>
-                  <option value={5}>C1</option>
-                </select>
               </div>
             </div>
 
-            {/* Results */}
             {isSearching && (
               <div className="flex justify-center py-8">
                 <div className={`w-6 h-6 border-2 ${isDark ? 'border-blue-400' : 'border-blue-600'} border-t-transparent rounded-full animate-spin`} />
@@ -236,7 +244,7 @@ export default function VocabularyPage() {
                   <div key={topic.topic} className={`${glassCard} rounded-xl p-3`}>
                     <div className="mb-2">
                       <span className={`text-sm font-semibold ${isDark ? 'text-cyan-300' : 'text-cyan-700'}`}>
-                        💡 {topic.topic} ({topic.word_count})
+                        {topic.topic} ({topic.word_count})
                       </span>
                     </div>
                     <div className="flex flex-wrap gap-1 mb-3">
@@ -248,44 +256,13 @@ export default function VocabularyPage() {
                       )}
                     </div>
                     <div className="flex gap-2">
-                      <button
-                        onClick={async () => {
-                          setIsSearching(true)
-                          const topicWords: VocabWord[] = []
-                          for (const w of topic.words) {
-                            const r = await fetch(`${getApiBase()}/api/vocabulary/search?q=${encodeURIComponent(w)}&lang=en&limit=1&source=kaikki`)
-                            if (r.ok) {
-                              const d = await r.json()
-                              if (d.words?.[0]) topicWords.push(d.words[0])
-                            }
-                          }
-                          setResults(topicWords)
-                          setIsSearching(false)
-                        }}
-                        className={`flex-1 text-xs px-3 py-2 rounded-lg ${isDark ? 'bg-white/10 text-white/60 hover:bg-white/20' : 'bg-slate-100 text-slate-600 hover:bg-slate-200'}`}
-                      >
+                      <button onClick={() => addTopicWords(topic, true)}
+                        className={`flex-1 text-xs px-3 py-2 rounded-lg ${isDark ? 'bg-white/10 text-white/60 hover:bg-white/20' : 'bg-slate-100 text-slate-600 hover:bg-slate-200'}`}>
                         Anzeigen
                       </button>
-                      <button
-                        onClick={async () => {
-                          setIsSearching(true)
-                          const topicWords: VocabWord[] = []
-                          for (const w of topic.words) {
-                            const r = await fetch(`${getApiBase()}/api/vocabulary/search?q=${encodeURIComponent(w)}&lang=en&limit=1&source=kaikki`)
-                            if (r.ok) {
-                              const d = await r.json()
-                              if (d.words?.[0] && !selectedWords.find(s => s.id === d.words[0].id)) {
-                                topicWords.push(d.words[0])
-                              }
-                            }
-                          }
-                          setSelectedWords(prev => [...prev, ...topicWords])
-                          setResults(topicWords)
-                          setIsSearching(false)
-                        }}
-                        className={`flex-1 text-xs px-3 py-2 rounded-lg font-semibold ${isDark ? 'bg-cyan-500/30 text-cyan-200 hover:bg-cyan-500/40 border border-cyan-400/30' : 'bg-cyan-100 text-cyan-700 hover:bg-cyan-200 border border-cyan-300'}`}
-                      >
-                        ✚ Alle zur Unit
+                      <button onClick={() => addTopicWords(topic, false)}
+                        className={`flex-1 text-xs px-3 py-2 rounded-lg font-semibold ${isDark ? 'bg-cyan-500/30 text-cyan-200 hover:bg-cyan-500/40 border border-cyan-400/30' : 'bg-cyan-100 text-cyan-700 hover:bg-cyan-200 border border-cyan-300'}`}>
+                        + Alle zur Unit
                       </button>
                     </div>
                   </div>
@@ -293,12 +270,17 @@ export default function VocabularyPage() {
               </div>
             )}
 
-            {!isSearching && results.length === 0 && query.trim() && topics.length === 0 && (
+            {/* No results message */}
+            {noSearchResults && (
               <div className={`${glassCard} rounded-2xl p-8 text-center`}>
                 <p className={isDark ? 'text-white/50' : 'text-slate-500'}>Keine Ergebnisse fuer &quot;{query}&quot;</p>
+                <p className={`text-xs mt-2 ${isDark ? 'text-white/30' : 'text-slate-400'}`}>
+                  Du kannst das Wort rechts manuell hinzufuegen →
+                </p>
               </div>
             )}
 
+            {/* Result list */}
             <div className="space-y-2">
               {results.map(word => (
                 <div
@@ -310,7 +292,6 @@ export default function VocabularyPage() {
                   }`}
                   onClick={() => toggleWord(word)}
                 >
-                  {/* Image or emoji placeholder */}
                   <div className={`w-14 h-14 rounded-xl flex items-center justify-center text-2xl flex-shrink-0 ${isDark ? 'bg-white/5' : 'bg-slate-100'}`}>
                     {word.image_url ? (
                       <img src={word.image_url} alt={word.english} className="w-full h-full object-cover rounded-xl" />
@@ -318,33 +299,22 @@ export default function VocabularyPage() {
                       <span className="text-xl">📝</span>
                     )}
                   </div>
-
-                  {/* Word info */}
                   <div className="flex-1 min-w-0">
                     <div className="flex items-center gap-2">
-                      <span className={`font-bold text-lg ${isDark ? 'text-white' : 'text-slate-900'}`}>{word.english}</span>
+                      <span className={`font-bold text-lg ${isDark ? 'text-white' : 'text-slate-900'}`}>{word.word || word.english}</span>
                       {word.ipa_en && <span className={`text-sm ${isDark ? 'text-white/40' : 'text-slate-400'}`}>{word.ipa_en}</span>}
-                      <AudioButton text={word.english} lang="en" isDark={isDark} size="sm" />
+                      <AudioButton text={word.word || word.english} lang={word.lang || searchLang} isDark={isDark} size="sm" />
                     </div>
                     <div className="flex items-center gap-2">
-                      <span className={`${isDark ? 'text-white/70' : 'text-slate-600'}`}>{word.german}</span>
-                      <AudioButton text={word.german} lang="de" isDark={isDark} size="sm" />
+                      <span className={`${isDark ? 'text-white/70' : 'text-slate-600'}`}>{word.german || word.english}</span>
+                      {word.german && <AudioButton text={word.german} lang="de" isDark={isDark} size="sm" />}
                     </div>
-                    <div className="flex items-center gap-2 mt-1">
                     {word.part_of_speech && (
-                        <span className={`text-xs px-2 py-0.5 rounded-full ${isDark ? 'bg-purple-500/20 text-purple-300' : 'bg-purple-100 text-purple-700'}`}>
+                      <span className={`text-xs px-2 py-0.5 rounded-full mt-1 inline-block ${isDark ? 'bg-purple-500/20 text-purple-300' : 'bg-purple-100 text-purple-700'}`}>
                         {word.part_of_speech}
                       </span>
                     )}
-                      {word.syllables_en.length > 0 && (
-                        <span className={`text-xs ${isDark ? 'text-white/30' : 'text-slate-400'}`}>
-                          {word.syllables_en.join(' · ')}
-                        </span>
-                      )}
                   </div>
-                  </div>
-
-                  {/* Select indicator */}
                   <div className={`w-8 h-8 rounded-full flex items-center justify-center flex-shrink-0 transition-colors ${
                     isSelected(word.id)
                       ? 'bg-blue-500 text-white'
@@ -360,59 +330,17 @@ export default function VocabularyPage() {
           </div>
 
           {/* Right: Unit Builder */}
-          <div className="w-80 flex-shrink-0">
-            <div className={`${glassCard} rounded-2xl p-5 sticky top-6`}>
-              <h3 className={`text-lg font-semibold mb-3 ${isDark ? 'text-white' : 'text-slate-900'}`}>
-                Lernunit erstellen
-              </h3>
-
-              <input
-                type="text"
-                value={unitTitle}
-                onChange={e => setUnitTitle(e.target.value)}
-                placeholder="Titel (z.B. Unit 3 - Food)"
-                className={`w-full px-4 py-2.5 rounded-xl border outline-none text-sm mb-4 ${glassInput}`}
+          <UnitBuilder
+            isDark={isDark}
+            glassCard={glassCard}
+            glassInput={glassInput}
+            selectedWords={unitWords}
+            onWordsChange={setUnitWords}
+            onCreateUnit={createUnit}
+            isCreating={isCreating}
+            noSearchResults={noSearchResults}
+            searchQuery={query}
           />
-
-              {selectedWords.length === 0 ? (
-                <p className={`text-sm text-center py-6 ${isDark ? 'text-white/40' : 'text-slate-400'}`}>
-                  Klicke auf Woerter um sie hinzuzufuegen
-                </p>
-              ) : (
-                <div className="space-y-1.5 max-h-80 overflow-y-auto mb-4">
-                  {selectedWords.map((w, i) => (
-                    <div key={w.id} className={`flex items-center justify-between px-3 py-2 rounded-lg ${isDark ? 'bg-white/5' : 'bg-slate-50'}`}>
-                      <div className="flex items-center gap-2 min-w-0">
-                        <span className={`text-xs w-5 text-center ${isDark ? 'text-white/30' : 'text-slate-400'}`}>{i+1}</span>
-                        <span className={`text-sm font-medium truncate ${isDark ? 'text-white' : 'text-slate-900'}`}>{w.english}</span>
-                        <span className={`text-xs truncate ${isDark ? 'text-white/40' : 'text-slate-400'}`}>{w.german}</span>
-                      </div>
-                      <button onClick={(e) => { e.stopPropagation(); toggleWord(w) }}
-                        className={`text-xs ${isDark ? 'text-red-400 hover:text-red-300' : 'text-red-500 hover:text-red-700'}`}>
-                        ✕
-                      </button>
-                    </div>
-                  ))}
-                </div>
-              )}
-
-              <div className={`text-xs mb-3 ${isDark ? 'text-white/40' : 'text-slate-400'}`}>
-                {selectedWords.length} Woerter ausgewaehlt
-              </div>
-
-              <button
-                onClick={createUnit}
-                disabled={isCreating || selectedWords.length === 0 || !unitTitle.trim()}
-                className={`w-full py-3 rounded-xl font-medium transition-all ${
-                  selectedWords.length > 0 && unitTitle.trim()
-                    ? 'bg-gradient-to-r from-blue-500 to-cyan-500 text-white hover:shadow-lg'
-                    : isDark ? 'bg-white/5 text-white/30' : 'bg-slate-100 text-slate-400'
-                }`}
-              >
-                {isCreating ? 'Wird erstellt...' : 'Lernunit starten'}
-              </button>
-            </div>
-          </div>
         </div>
       </div>
     </div>