Redesign Parent Quiz: explanation panel + trilingual buttons

Major improvements for non-DE/EN speaking parents:

1. Right panel: Explains in parent's native language what this
   exercise is about and how it works (TR/AR/UK/RU/PL translations)

2. Trilingual buttons: "Dogru" (primary) with "Richtig / Correct"
   subtitle so parents understand even if language detection is wrong

3. Native word shown prominently: "= elma" next to "apple"

4. Audio buttons labeled EN/DE/TR with language codes

5. Answer card shows all 3 languages: English, Deutsch, native

6. Progress tracker in the explanation panel

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

studio-v2/app/parent/quiz/[unitId]/page.tsx

@@ -12,7 +12,27 @@ interface QAItem {
   translations?: Record<string, { text?: string }>
 }
 
-// UI translations now come from useNativeLanguage() hook + exerciseTranslations.ts
+// Context explanations in all languages
+const parentGuide: Record<string, Record<string, string>> = {
+  title: {
+    de: 'Vokabelabfrage fuer Ihr Kind',
+    en: 'Vocabulary quiz for your child',
+    tr: 'Cocugunuz icin kelime sorgusu',
+    ar: '\u0627\u062e\u062a\u0628\u0627\u0631 \u0645\u0641\u0631\u062f\u0627\u062a \u0644\u0637\u0641\u0644\u0643',
+    uk: '\u041e\u043f\u0438\u0442\u0443\u0432\u0430\u043d\u043d\u044f \u0441\u043b\u0456\u0432 \u0434\u043b\u044f \u0432\u0430\u0448\u043e\u0457 \u0434\u0438\u0442\u0438\u043d\u0438',
+    ru: '\u041e\u043f\u0440\u043e\u0441 \u0441\u043b\u043e\u0432 \u0434\u043b\u044f \u0432\u0430\u0448\u0435\u0433\u043e \u0440\u0435\u0431\u0435\u043d\u043a\u0430',
+    pl: 'Test slowek dla Twojego dziecka',
+  },
+  how_it_works: {
+    de: 'So funktioniert es: Druecken Sie den Lautsprecher — Ihr Kind hoert das englische Wort und sagt die deutsche Uebersetzung. Sie sehen die richtige Antwort und koennen pruefen ob Ihr Kind richtig liegt.',
+    en: 'How it works: Press the speaker — your child hears the English word and says the German translation. You see the correct answer and can check.',
+    tr: 'Nasil calisir: Hoparlore basin — cocugunuz Ingilizce kelimeyi duyar ve Almanca cevirisini soyler. Siz dogru cevabi gorursunuz ve kontrol edebilirsiniz.',
+    ar: '\u0643\u064a\u0641 \u064a\u0639\u0645\u0644: \u0627\u0636\u063a\u0637 \u0639\u0644\u0649 \u0627\u0644\u0645\u0643\u0628\u0631 \u2014 \u0637\u0641\u0644\u0643 \u064a\u0633\u0645\u0639 \u0627\u0644\u0643\u0644\u0645\u0629 \u0628\u0627\u0644\u0625\u0646\u062c\u0644\u064a\u0632\u064a\u0629 \u0648\u064a\u0642\u0648\u0644 \u0627\u0644\u062a\u0631\u062c\u0645\u0629 \u0628\u0627\u0644\u0623\u0644\u0645\u0627\u0646\u064a\u0629. \u062a\u0631\u0649 \u0627\u0644\u0625\u062c\u0627\u0628\u0629 \u0627\u0644\u0635\u062d\u064a\u062d\u0629 \u0648\u064a\u0645\u0643\u0646\u0643 \u0627\u0644\u062a\u062d\u0642\u0642.',
+    uk: '\u042f\u043a \u0446\u0435 \u043f\u0440\u0430\u0446\u044e\u0454: \u041d\u0430\u0442\u0438\u0441\u043d\u0456\u0442\u044c \u043d\u0430 \u0434\u0438\u043d\u0430\u043c\u0456\u043a \u2014 \u0434\u0438\u0442\u0438\u043d\u0430 \u043f\u043e\u0447\u0443\u0454 \u0430\u043d\u0433\u043b\u0456\u0439\u0441\u044c\u043a\u0435 \u0441\u043b\u043e\u0432\u043e \u0456 \u043a\u0430\u0436\u0435 \u043d\u0456\u043c\u0435\u0446\u044c\u043a\u0438\u0439 \u043f\u0435\u0440\u0435\u043a\u043b\u0430\u0434. \u0412\u0438 \u0431\u0430\u0447\u0438\u0442\u0435 \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u0443 \u0432\u0456\u0434\u043f\u043e\u0432\u0456\u0434\u044c.',
+    ru: '\u041a\u0430\u043a \u044d\u0442\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442: \u041d\u0430\u0436\u043c\u0438\u0442\u0435 \u043d\u0430 \u0434\u0438\u043d\u0430\u043c\u0438\u043a \u2014 \u0440\u0435\u0431\u0435\u043d\u043e\u043a \u0443\u0441\u043b\u044b\u0448\u0438\u0442 \u0430\u043d\u0433\u043b\u0438\u0439\u0441\u043a\u043e\u0435 \u0441\u043b\u043e\u0432\u043e \u0438 \u0441\u043a\u0430\u0436\u0435\u0442 \u043d\u0435\u043c\u0435\u0446\u043a\u0438\u0439 \u043f\u0435\u0440\u0435\u0432\u043e\u0434. \u0412\u044b \u0432\u0438\u0434\u0438\u0442\u0435 \u043f\u0440\u0430\u0432\u0438\u043b\u044c\u043d\u044b\u0439 \u043e\u0442\u0432\u0435\u0442.',
+    pl: 'Jak to dziala: Nacisnij glosnik — dziecko slyszy angielskie slowo i mowi niemiecki odpowiednik. Widzisz poprawna odpowiedz i mozesz sprawdzic.',
+  },
+}
 
 export default function ParentQuizPage() {
   const { unitId } = useParams<{ unitId: string }>()
@@ -27,11 +47,14 @@ export default function ParentQuizPage() {
   const [isLoading, setIsLoading] = useState(true)
   const [stats, setStats] = useState({ correct: 0, incorrect: 0 })
   const [isComplete, setIsComplete] = useState(false)
+  const [showGuide, setShowGuide] = useState(true)
 
   const glassCard = isDark
     ? 'bg-white/10 backdrop-blur-xl border border-white/10'
     : 'bg-white/80 backdrop-blur-xl border border-black/5'
 
+  const pg = (key: string) => parentGuide[key]?.[nativeLang] || parentGuide[key]?.['de'] || key
+
   useEffect(() => {
     fetch(`/api/learning-units/${unitId}/qa`)
       .then(r => r.ok ? r.json() : { qa_items: [] })
@@ -46,34 +69,33 @@ export default function ParentQuizPage() {
       incorrect: prev.incorrect + (correct ? 0 : 1),
     }))
     setShowAnswer(false)
-    if (currentIndex + 1 >= items.length) { setIsComplete(true) }
-    else { setCurrentIndex(i => i + 1) }
+    if (currentIndex + 1 >= items.length) setIsComplete(true)
+    else setCurrentIndex(i => i + 1)
   }, [currentIndex, items.length])
 
   const currentItem = items[currentIndex]
-  const nativeTranslation = wordInNative(currentItem?.translations)
+  const nativeWord = wordInNative(currentItem?.translations)
 
   if (isLoading) {
-    return (
-      <div className="flex items-center justify-center py-20">
+    return <div className="flex items-center justify-center py-20">
       <div className="w-8 h-8 border-4 border-blue-400 border-t-transparent rounded-full animate-spin" />
     </div>
-    )
   }
 
   return (
-    <div dir={language === 'ar' ? 'rtl' : 'ltr'}>
-
+    <div dir={nativeLang === 'ar' ? 'rtl' : 'ltr'}>
       {/* Header */}
       <div className={`${glassCard} border-0 border-b`}>
-        <div className="max-w-lg mx-auto px-6 py-4 flex items-center justify-between">
+        <div className="max-w-4xl mx-auto px-6 py-4 flex items-center justify-between">
           <button onClick={() => router.push('/parent')} className={`text-sm ${isDark ? 'text-white/60' : 'text-slate-500'}`}>
             {t('back')}
           </button>
           <span className={`font-bold ${isDark ? 'text-white' : 'text-slate-900'}`}>
             {t('question')} {currentIndex + 1}/{items.length}
           </span>
-          <span />
+          <button onClick={() => setShowGuide(!showGuide)} className={`text-sm ${isDark ? 'text-blue-300' : 'text-blue-600'}`}>
+            {showGuide ? '?' : '?'}
+          </button>
         </div>
       </div>
 
@@ -82,9 +104,9 @@ export default function ParentQuizPage() {
         <div className="h-full bg-gradient-to-r from-blue-500 to-cyan-500 transition-all" style={{ width: `${(currentIndex / Math.max(items.length, 1)) * 100}%` }} />
       </div>
 
-      <div className="flex-1 flex items-center justify-center px-6 py-8">
+      <div className="max-w-4xl mx-auto px-6 py-6">
         {isComplete ? (
-          <div className={`${glassCard} rounded-3xl p-10 text-center max-w-md w-full`}>
+          <div className={`${glassCard} rounded-3xl p-10 text-center max-w-md mx-auto`}>
             <div className="text-5xl mb-4">{stats.correct > stats.incorrect ? '\uD83C\uDF89' : '\uD83D\uDCAA'}</div>
             <h2 className={`text-2xl font-bold mb-2 ${isDark ? 'text-white' : 'text-slate-900'}`}>{t('done')}</h2>
             <p className={`text-lg mb-6 ${isDark ? 'text-white/70' : 'text-slate-600'}`}>
@@ -92,32 +114,50 @@ export default function ParentQuizPage() {
             </p>
             <div className="flex gap-3">
               <button onClick={() => { setCurrentIndex(0); setStats({ correct: 0, incorrect: 0 }); setIsComplete(false) }}
-                className="flex-1 py-3 rounded-xl bg-gradient-to-r from-blue-500 to-cyan-500 text-white font-medium">{t('again')}</button>
+                className="flex-1 py-3 rounded-xl bg-gradient-to-r from-blue-500 to-cyan-500 text-white font-medium">
+                {t('again')}
+              </button>
               <button onClick={() => router.push('/parent')}
-                className={`flex-1 py-3 rounded-xl border font-medium ${isDark ? 'border-white/20 text-white/80' : 'border-slate-300 text-slate-700'}`}>{t('back')}</button>
+                className={`flex-1 py-3 rounded-xl border font-medium ${isDark ? 'border-white/20 text-white/80' : 'border-slate-300 text-slate-700'}`}>
+                {t('back')}
+              </button>
             </div>
           </div>
         ) : currentItem ? (
-          <div className="w-full max-w-md space-y-6">
-            {/* Instruction for parent */}
-            <p className={`text-center text-sm ${isDark ? 'text-white/50' : 'text-slate-500'}`}>
+          <div className="flex gap-6">
+            {/* Left: Quiz Card */}
+            <div className="flex-1 space-y-5">
+              {/* Instruction */}
+              <p className={`text-sm ${isDark ? 'text-white/50' : 'text-slate-500'}`}>
                 {t('ask_child')}
               </p>
 
-            {/* Word to ask */}
+              {/* Word Card */}
               <div className={`${glassCard} rounded-3xl p-8 text-center`}>
-              <span className={`text-3xl font-bold ${isDark ? 'text-white' : 'text-slate-900'}`}>
+                {/* English word */}
+                <span className={`text-xs font-medium ${isDark ? 'text-white/30' : 'text-slate-400'}`}>ENGLISH</span>
+                <p className={`text-3xl font-bold mt-1 ${isDark ? 'text-white' : 'text-slate-900'}`}>
                   {currentItem.question}
-              </span>
-              {nativeTranslation && (
-                <p className={`text-lg mt-3 ${isDark ? 'text-blue-300/70' : 'text-blue-600'}`}>
-                  ({nativeTranslation})
+                </p>
+
+                {/* Native translation */}
+                {nativeWord && (
+                  <p className={`text-lg mt-3 ${isDark ? 'text-cyan-300/80' : 'text-cyan-700'}`}>
+                    = {nativeWord}
                   </p>
                 )}
+
+                {/* Audio buttons */}
                 <div className="flex justify-center gap-3 mt-4">
+                  <div className="flex flex-col items-center gap-1">
                     <AudioButton text={currentItem.question} lang="en" isDark={isDark} size="md" />
-                {nativeTranslation && (
-                  <AudioButton text={nativeTranslation} lang={nativeLang as 'en' | 'de'} isDark={isDark} size="md" />
+                    <span className={`text-[10px] ${isDark ? 'text-white/30' : 'text-slate-400'}`}>EN</span>
+                  </div>
+                  {nativeWord && (
+                    <div className="flex flex-col items-center gap-1">
+                      <AudioButton text={nativeWord} lang={nativeLang as 'en' | 'de'} isDark={isDark} size="md" />
+                      <span className={`text-[10px] ${isDark ? 'text-white/30' : 'text-slate-400'}`}>{nativeLang.toUpperCase()}</span>
+                    </div>
                   )}
                 </div>
               </div>
@@ -132,35 +172,72 @@ export default function ParentQuizPage() {
                 {showAnswer ? t('hide_answer') : t('show_answer')}
               </button>
 
+              {/* Answer */}
               {showAnswer && (
                 <div className={`${glassCard} rounded-2xl p-6 text-center`}>
-                <p className={`text-xs mb-2 ${isDark ? 'text-white/40' : 'text-slate-400'}`}>{t('correct_answer')}</p>
-                <span className={`text-2xl font-bold ${isDark ? 'text-green-300' : 'text-green-700'}`}>
+                  <p className={`text-xs mb-1 ${isDark ? 'text-white/40' : 'text-slate-400'}`}>{t('correct_answer')}</p>
+                  <span className={`text-xs ${isDark ? 'text-white/30' : 'text-slate-400'}`}>DEUTSCH</span>
+                  <p className={`text-2xl font-bold ${isDark ? 'text-green-300' : 'text-green-700'}`}>
                     {currentItem.answer}
-                </span>
-                {nativeTranslation && (
-                  <p className={`text-sm mt-1 ${isDark ? 'text-white/50' : 'text-slate-500'}`}>
-                    ({nativeTranslation})
+                  </p>
+                  {nativeWord && (
+                    <p className={`text-sm mt-1 ${isDark ? 'text-cyan-300/60' : 'text-cyan-600'}`}>
+                      = {nativeWord}
                     </p>
                   )}
-                <div className="flex justify-center mt-3">
+                  <div className="flex justify-center gap-3 mt-3">
+                    <div className="flex flex-col items-center gap-1">
                       <AudioButton text={currentItem.answer} lang="de" isDark={isDark} size="md" />
+                      <span className={`text-[10px] ${isDark ? 'text-white/30' : 'text-slate-400'}`}>DE</span>
+                    </div>
                   </div>
                 </div>
               )}
 
-            {/* Right/Wrong Buttons */}
+              {/* Trilingual Buttons */}
               <div className="flex gap-4">
                 <button onClick={() => handleResult(false)}
                   className="flex-1 py-4 rounded-2xl font-semibold bg-gradient-to-r from-red-500 to-rose-500 text-white hover:shadow-lg transition-all">
-                {t('wrong')}
+                  <span className="text-lg">{t('wrong')}</span>
+                  {isThirdLanguage && <span className={`block text-xs mt-0.5 text-white/60`}>Falsch / Wrong</span>}
                 </button>
                 <button onClick={() => handleResult(true)}
                   className="flex-1 py-4 rounded-2xl font-semibold bg-gradient-to-r from-green-500 to-emerald-500 text-white hover:shadow-lg transition-all">
-                {t('correct')}
+                  <span className="text-lg">{t('correct')}</span>
+                  {isThirdLanguage && <span className={`block text-xs mt-0.5 text-white/60`}>Richtig / Correct</span>}
                 </button>
               </div>
             </div>
+
+            {/* Right: Explanation Card (in parent's native language) */}
+            {showGuide && (
+              <div className="w-72 flex-shrink-0">
+                <div className={`${glassCard} rounded-2xl p-5 sticky top-6`}>
+                  <h3 className={`text-sm font-semibold mb-3 ${isDark ? 'text-cyan-300' : 'text-cyan-700'}`}>
+                    {pg('title')}
+                  </h3>
+                  <p className={`text-xs leading-relaxed ${isDark ? 'text-white/60' : 'text-slate-600'}`}>
+                    {pg('how_it_works')}
+                  </p>
+
+                  <div className={`mt-4 pt-3 border-t ${isDark ? 'border-white/10' : 'border-slate-200'}`}>
+                    <p className={`text-xs ${isDark ? 'text-white/40' : 'text-slate-400'}`}>
+                      {items.length} {t('cards').toLowerCase()} · {t('question')} {currentIndex + 1}
+                    </p>
+                    <div className={`mt-2 h-1.5 rounded-full ${isDark ? 'bg-white/10' : 'bg-slate-100'}`}>
+                      <div className="h-full rounded-full bg-gradient-to-r from-cyan-500 to-blue-500 transition-all"
+                        style={{ width: `${((currentIndex + 1) / items.length) * 100}%` }} />
+                    </div>
+                    {stats.correct + stats.incorrect > 0 && (
+                      <p className={`text-xs mt-2 ${isDark ? 'text-white/40' : 'text-slate-400'}`}>
+                        ✅ {stats.correct} &nbsp; ❌ {stats.incorrect}
+                      </p>
+                    )}
+                  </div>
+                </div>
+              </div>
+            )}
+          </div>
         ) : null}
       </div>
     </div>