ux: 優化學習模式的用戶體驗設計

- 簡化語音播放器，移除口音切換和音量控制
- 修正選擇題邏輯：根據英文定義選擇詞彙
- 修復播放按鈕事件冒泡問題，避免誤觸翻卡
- 優化翻卡背面設計，使用灰色區塊和自適應高度
- 統一語音播放為美式發音，提供一致體驗

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/app/learn/page.tsx

@@ -73,12 +73,12 @@ export default function LearnPage() {
 
   // Quiz mode options - dynamically generate from current cards
   const quizOptions = [
-    cards[currentCardIndex].translation,
+    cards[currentCardIndex].word,
     ...cards
       .filter((_, idx) => idx !== currentCardIndex)
-      .map(card => card.translation)
+      .map(card => card.word)
       .slice(0, 2),
-    '建議、提議' // additional wrong option
+    'negotiate' // additional wrong option
   ].sort(() => Math.random() - 0.5) // shuffle options
 
   const handleFlip = () => {
@@ -130,7 +130,7 @@ export default function LearnPage() {
   const handleQuizAnswer = (answer: string) => {
     setSelectedAnswer(answer)
     setShowResult(true)
-    if (answer === currentCard.translation) {
+    if (answer === currentCard.word) {
       setScore({ ...score, correct: score.correct + 1, total: score.total + 1 })
     } else {
       setScore({ ...score, total: score.total + 1 })
@@ -281,12 +281,12 @@ export default function LearnPage() {
             </div>
 
             <div
-              className="relative w-full h-96 cursor-pointer"
+              className="relative w-full min-h-96 cursor-pointer"
               onClick={handleFlip}
               style={{ perspective: '1000px' }}
             >
               <div
-                className={`absolute w-full h-full transition-transform duration-600 ${
+                className={`w-full transition-transform duration-600 ${
                   isFlipped ? 'rotate-y-180' : ''
                 }`}
                 style={{
@@ -296,8 +296,11 @@ export default function LearnPage() {
               >
                 {/* Front of card */}
                 <div
-                  className="absolute w-full h-full bg-white rounded-2xl shadow-xl p-8 flex flex-col items-center justify-center"
-                  style={{ backfaceVisibility: 'hidden' }}
+                  className="w-full min-h-96 bg-white rounded-2xl shadow-xl p-8 flex flex-col items-center justify-center"
+                  style={{
+                    backfaceVisibility: 'hidden',
+                    display: isFlipped ? 'none' : 'flex'
+                  }}
                 >
                   <div className="text-4xl font-bold text-gray-900 mb-4">
                     {currentCard.word}
@@ -311,10 +314,6 @@ export default function LearnPage() {
                     </div>
                     <AudioPlayer
                       text={currentCard.word}
-                      accent="us"
-                      speed={1.0}
-                      showAccentSelector={false}
-                      showSpeedControl={false}
                       className="flex-shrink-0"
                     />
                   </div>
@@ -325,39 +324,36 @@ export default function LearnPage() {
 
                 {/* Back of card */}
                 <div
-                  className="absolute w-full h-full bg-white rounded-2xl shadow-xl p-8"
+                  className="w-full bg-white rounded-2xl shadow-xl p-6"
                   style={{
                     backfaceVisibility: 'hidden',
-                    transform: 'rotateY(180deg)'
+                    transform: 'rotateY(180deg)',
+                    display: isFlipped ? 'block' : 'none'
                   }}
                 >
-                  <div className="space-y-4">
-                    <div>
+                  <div className="space-y-3">
+                    <div className="p-3 bg-gray-50 rounded-lg">
                       <div className="text-sm font-semibold text-gray-700 mb-1">翻譯</div>
-                      <div className="text-2xl font-bold text-gray-900">{currentCard.translation}</div>
+                      <div className="text-xl font-bold text-gray-900">{currentCard.translation}</div>
                     </div>
-                    <div>
+                    <div className="p-3 bg-gray-50 rounded-lg">
                       <div className="text-sm font-semibold text-gray-700 mb-1">定義</div>
-                      <div className="text-gray-600">{currentCard.definition}</div>
+                      <div className="text-gray-600 text-sm">{currentCard.definition}</div>
                     </div>
-                    <div>
+                    <div className="p-3 bg-gray-50 rounded-lg">
                       <div className="text-sm font-semibold text-gray-700 mb-1">例句</div>
-                      <div className="text-gray-600 mb-2">{currentCard.example}</div>
-                      <div className="text-gray-500 text-sm mb-3">{currentCard.exampleTranslation}</div>
+                      <div className="text-gray-600 text-sm mb-2">{currentCard.example}</div>
+                      <div className="text-gray-500 text-xs mb-2">{currentCard.exampleTranslation}</div>
                       <AudioPlayer
                         text={currentCard.example}
-                        accent="us"
-                        speed={0.8}
-                        showAccentSelector={true}
-                        showSpeedControl={true}
-                        className="mt-2"
+                        className="mt-1"
                       />
                     </div>
-                    <div>
+                    <div className="p-3 bg-gray-50 rounded-lg">
                       <div className="text-sm font-semibold text-gray-700 mb-1">同義詞</div>
                       <div className="flex flex-wrap gap-2">
                         {currentCard.synonyms.map((syn, idx) => (
-                          <span key={idx} className="px-3 py-1 bg-gray-100 rounded-full text-sm">
+                          <span key={idx} className="px-2 py-1 bg-gray-100 rounded-full text-xs">
                             {syn}
                           </span>
                         ))}
@@ -419,21 +415,19 @@ export default function LearnPage() {
 
             <div className="bg-white rounded-2xl shadow-xl p-8">
               <div className="mb-6">
-                <div className="text-sm text-gray-600 mb-2">根據定義選擇正確的中文翻譯</div>
-                <div className="text-xl text-gray-800 leading-relaxed mb-3">
-                  {currentCard.definition}
+                <div className="text-sm text-gray-600 mb-4">根據英文定義選擇正確的英文詞彙</div>
+                <div className="p-4 bg-gray-50 rounded-lg">
+                  <div className="text-xl text-gray-800 leading-relaxed mb-3">
+                    {currentCard.definition}
+                  </div>
+                  <div className="text-sm text-gray-500 mb-3">
+                    ({currentCard.partOfSpeech})
+                  </div>
+                  <AudioPlayer
+                    text={currentCard.definition}
+                    className="mt-2"
+                  />
                 </div>
-                <div className="text-sm text-gray-500 mb-3">
-                  ({currentCard.partOfSpeech})
-                </div>
-                <AudioPlayer
-                  text={currentCard.definition}
-                  accent="us"
-                  speed={0.9}
-                  showAccentSelector={false}
-                  showSpeedControl={true}
-                  className="mt-2"
-                />
               </div>
 
             <div className="space-y-3">
@@ -443,9 +437,9 @@ export default function LearnPage() {
                   onClick={() => !showResult && handleQuizAnswer(option)}
                   disabled={showResult}
                   className={`w-full p-4 text-left rounded-lg border-2 transition-all ${
-                    showResult && option === currentCard.translation
+                    showResult && option === currentCard.word
                       ? 'border-green-500 bg-green-50'
-                      : showResult && option === selectedAnswer && option !== currentCard.translation
+                      : showResult && option === selectedAnswer && option !== currentCard.word
                       ? 'border-red-500 bg-red-50'
                       : selectedAnswer === option
                       ? 'border-primary bg-primary-light'
@@ -454,12 +448,12 @@ export default function LearnPage() {
                 >
                   <div className="flex items-center justify-between">
                     <span className="font-medium">{option}</span>
-                    {showResult && option === currentCard.translation && (
+                    {showResult && option === currentCard.word && (
                       <svg className="w-5 h-5 text-green-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                         <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
                       </svg>
                     )}
-                    {showResult && option === selectedAnswer && option !== currentCard.translation && (
+                    {showResult && option === selectedAnswer && option !== currentCard.word && (
                       <svg className="w-5 h-5 text-red-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                         <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
                       </svg>
@@ -598,10 +592,6 @@ export default function LearnPage() {
                   <div className="text-gray-500 mb-3">{currentCard.exampleTranslation}</div>
                   <AudioPlayer
                     text={currentCard.example}
-                    accent="us"
-                    speed={0.8}
-                    showAccentSelector={false}
-                    showSpeedControl={true}
                     className="mt-2"
                   />
                 </div>
@@ -637,10 +627,6 @@ export default function LearnPage() {
               <div className="flex flex-col items-center mb-6">
                 <AudioPlayer
                   text={currentCard.word}
-                  accent="us"
-                  speed={1.0}
-                  showAccentSelector={true}
-                  showSpeedControl={true}
                   className="mb-4"
                 />
                 <div className="text-sm text-gray-500">
@@ -674,7 +660,6 @@ export default function LearnPage() {
             {/* Result Display */}
             {showResult && (
               <div className="mt-6 p-4 bg-gray-50 rounded-lg">
-                <div className="text-sm font-semibold text-gray-700 mb-2">單字詳情</div>
                 <div className="space-y-2">
                   <div>
                     <span className="font-semibold">{currentCard.word}</span> - {currentCard.translation}
@@ -728,10 +713,6 @@ export default function LearnPage() {
                   <span className="text-gray-500">{currentCard.pronunciation}</span>
                   <AudioPlayer
                     text={currentCard.word}
-                    accent="us"
-                    speed={1.0}
-                    showAccentSelector={false}
-                    showSpeedControl={false}
                     className="flex-shrink-0"
                   />
                 </div>
@@ -739,10 +720,6 @@ export default function LearnPage() {
                   <div className="text-sm text-gray-600 mb-2">完整例句發音：</div>
                   <AudioPlayer
                     text={currentCard.example}
-                    accent="us"
-                    speed={0.8}
-                    showAccentSelector={true}
-                    showSpeedControl={true}
                     className="flex-shrink-0"
                   />
                 </div>

frontend/components/AudioPlayer.tsx

@@ -6,11 +6,7 @@ import { Play, Pause, Volume2, VolumeX, Settings } from 'lucide-react';
 export interface AudioPlayerProps {
   text: string;
   audioUrl?: string;
-  accent?: 'us' | 'uk';
-  speed?: number;
   autoPlay?: boolean;
-  showAccentSelector?: boolean;
-  showSpeedControl?: boolean;
   onPlayStart?: () => void;
   onPlayEnd?: () => void;
   onError?: (error: string) => void;
@@ -27,11 +23,7 @@ export interface TTSResponse {
 export default function AudioPlayer({
   text,
   audioUrl: providedAudioUrl,
-  accent = 'us',
-  speed = 1.0,
   autoPlay = false,
-  showAccentSelector = true,
-  showSpeedControl = true,
   onPlayStart,
   onPlayEnd,
   onError,
@@ -39,18 +31,13 @@ export default function AudioPlayer({
 }: AudioPlayerProps) {
   const [isPlaying, setIsPlaying] = useState(false);
   const [isLoading, setIsLoading] = useState(false);
-  const [isMuted, setIsMuted] = useState(false);
-  const [volume, setVolume] = useState(1);
-  const [currentAccent, setCurrentAccent] = useState<'us' | 'uk'>(accent);
-  const [currentSpeed, setCurrentSpeed] = useState(speed);
   const [audioUrl, setAudioUrl] = useState<string | null>(providedAudioUrl || null);
-  const [showSettings, setShowSettings] = useState(false);
   const [error, setError] = useState<string | null>(null);
 
   const audioRef = useRef<HTMLAudioElement>(null);
 
   // 生成音頻
-  const generateAudio = async (textToSpeak: string, accent: 'us' | 'uk', speed: number) => {
+  const generateAudio = async (textToSpeak: string) => {
     try {
       setIsLoading(true);
       setError(null);
@@ -63,8 +50,8 @@ export default function AudioPlayer({
         },
         body: JSON.stringify({
           text: textToSpeak,
-          accent: accent,
-          speed: speed,
+          accent: 'us',
+          speed: 1.0,
           voice: ''
         })
       });
@@ -103,7 +90,7 @@ export default function AudioPlayer({
 
       // 如果沒有音頻 URL，先生成
       if (!urlToPlay) {
-        urlToPlay = await generateAudio(text, currentAccent, currentSpeed);
+        urlToPlay = await generateAudio(text);
         if (!urlToPlay) return;
       }
 
@@ -111,8 +98,6 @@ export default function AudioPlayer({
       if (!audio) return;
 
       audio.src = urlToPlay;
-      audio.playbackRate = currentSpeed;
-      audio.volume = isMuted ? 0 : volume;
 
       await audio.play();
       setIsPlaying(true);
@@ -134,7 +119,8 @@ export default function AudioPlayer({
   };
 
   // 切換播放/暫停
-  const togglePlayPause = () => {
+  const togglePlayPause = (e?: React.MouseEvent) => {
+    e?.stopPropagation(); // 阻止事件冒泡
     if (isPlaying) {
       pauseAudio();
     } else {
@@ -155,58 +141,10 @@ export default function AudioPlayer({
     onError?.(errorMessage);
   };
 
-  // 切換口音
-  const handleAccentChange = async (newAccent: 'us' | 'uk') => {
-    if (newAccent === currentAccent) return;
-
-    setCurrentAccent(newAccent);
-    setAudioUrl(null); // 清除現有音頻，強制重新生成
-
-    // 如果正在播放，停止並重新生成
-    if (isPlaying) {
-      pauseAudio();
-      await generateAudio(text, newAccent, currentSpeed);
-    }
-  };
-
-  // 切換速度
-  const handleSpeedChange = async (newSpeed: number) => {
-    if (newSpeed === currentSpeed) return;
-
-    setCurrentSpeed(newSpeed);
-
-    // 如果音頻正在播放，直接調整播放速度
-    const audio = audioRef.current;
-    if (audio && isPlaying) {
-      audio.playbackRate = newSpeed;
-    } else {
-      // 否則清除音頻，重新生成
-      setAudioUrl(null);
-    }
-  };
-
-  // 音量控制
-  const handleVolumeChange = (newVolume: number) => {
-    setVolume(newVolume);
-    const audio = audioRef.current;
-    if (audio) {
-      audio.volume = isMuted ? 0 : newVolume;
-    }
-  };
-
-  const toggleMute = () => {
-    const newMuted = !isMuted;
-    setIsMuted(newMuted);
-    const audio = audioRef.current;
-    if (audio) {
-      audio.volume = newMuted ? 0 : volume;
-    }
-  };
-
   // 自動播放
   useEffect(() => {
     if (autoPlay && text && !audioUrl) {
-      generateAudio(text, currentAccent, currentSpeed);
+      generateAudio(text);
     }
   }, [autoPlay, text]);
 
@@ -242,75 +180,6 @@ export default function AudioPlayer({
         )}
       </button>
 
-      {/* 口音選擇器 */}
-      {showAccentSelector && (
-        <div className="flex gap-1">
-          <button
-            onClick={() => handleAccentChange('us')}
-            className={`
-              px-2 py-1 text-xs rounded transition-colors
-              ${currentAccent === 'us'
-                ? 'bg-blue-600 text-white'
-                : 'bg-gray-200 text-gray-700 hover:bg-gray-300'
-              }
-            `}
-          >
-            US
-          </button>
-          <button
-            onClick={() => handleAccentChange('uk')}
-            className={`
-              px-2 py-1 text-xs rounded transition-colors
-              ${currentAccent === 'uk'
-                ? 'bg-blue-600 text-white'
-                : 'bg-gray-200 text-gray-700 hover:bg-gray-300'
-              }
-            `}
-          >
-            UK
-          </button>
-        </div>
-      )}
-
-      {/* 速度控制 */}
-      {showSpeedControl && (
-        <div className="flex items-center gap-1">
-          <span className="text-xs text-gray-600">Speed:</span>
-          <select
-            value={currentSpeed}
-            onChange={(e) => handleSpeedChange(parseFloat(e.target.value))}
-            className="text-xs border border-gray-300 rounded px-1 py-0.5"
-          >
-            <option value={0.5}>0.5x</option>
-            <option value={0.75}>0.75x</option>
-            <option value={1.0}>1x</option>
-            <option value={1.25}>1.25x</option>
-            <option value={1.5}>1.5x</option>
-            <option value={2.0}>2x</option>
-          </select>
-        </div>
-      )}
-
-      {/* 音量控制 */}
-      <div className="flex items-center gap-1">
-        <button
-          onClick={toggleMute}
-          className="p-1 text-gray-600 hover:text-gray-800"
-          title={isMuted ? 'Unmute' : 'Mute'}
-        >
-          {isMuted ? <VolumeX size={16} /> : <Volume2 size={16} />}
-        </button>
-        <input
-          type="range"
-          min={0}
-          max={1}
-          step={0.1}
-          value={isMuted ? 0 : volume}
-          onChange={(e) => handleVolumeChange(parseFloat(e.target.value))}
-          className="w-16 h-1"
-        />
-      </div>
-
       {/* 錯誤顯示 */}
       {error && (
         <div className="text-xs text-red-600 bg-red-50 px-2 py-1 rounded">

frontend/components/FlashcardForm.tsx

@@ -168,10 +168,6 @@ export function FlashcardForm({ cardSets, initialData, isEdit = false, onSuccess
                   <div className="flex-shrink-0">
                     <AudioPlayer
                       text={formData.english}
-                      accent="us"
-                      speed={1.0}
-                      showAccentSelector={true}
-                      showSpeedControl={false}
                       className="w-auto"
                     />
                   </div>