/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background-color: white;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    padding: 30px;
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 2px solid #eaeaea;
}

h1 {
    color: #2c3e50;
    font-size: 28px;
    margin-bottom: 15px;
}

.difficulty-indicator {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: bold;
    margin-bottom: 15px;
    font-size: 16px;
}

.difficulty-medium {
    background-color: #3498db;
    color: white;
}

.difficulty-easy {
    background-color: #2ecc71;
    color: white;
}

.difficulty-hard {
    background-color: #e74c3c;
    color: white;
}

.quiz-info {
    color: #7f8c8d;
    font-size: 16px;
}

/* 题目样式 */
.question {
    margin-bottom: 35px;
    padding: 25px;
    border-radius: 10px;
    background-color: #f9f9f9;
    border-left: 4px solid #3498db;
    transition: all 0.3s ease;
}

.question:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.question-number {
    font-weight: bold;
    font-size: 18px;
    color: #2c3e50;
}

.question-points {
    background-color: #3498db;
    color: white;
    padding: 4px 10px;
    border-radius: 15px;
    font-size: 14px;
    font-weight: bold;
}

.question-text {
    font-size: 18px;
    margin-bottom: 20px;
    color: #34495e;
    font-weight: 500;
}

.options {
    margin-bottom: 20px;
}

.option {
    margin-bottom: 15px;  /* 从12px增加到15px */
    padding: 15px 18px;   /* 从12px 15px增加到15px 18px */
    border-radius: 8px;
    border: 2px solid #e0e0e0;
    cursor: pointer;
    transition: all 0.2s ease;
    background-color: white;
    display: flex;
    align-items: center;
}

.option input[type="radio"],
.option input[type="checkbox"] {
    margin-right: 20px;  /* 增加间距到20px */
    cursor: pointer;
    flex-shrink: 0;
}

.option label {
    cursor: pointer;
    display: inline;
    flex-grow: 1;
    line-height: 1.4;
}

.option:hover {
    border-color: #3498db;
    background-color: #f0f8ff;
}

.question-explanation {
    display: none;
    margin-top: 15px;
    padding: 15px;
    background-color: #e8f4fd;
    border-radius: 8px;
    border-left: 4px solid #3498db;
    color: #2c3e50;
}

.hidden {
    display: none;
}

/* 导航按钮样式 */
.navigation-section {
    text-align: center;
    margin-top: 40px;
    padding: 25px;
    background-color: #f8f9fa;
    border-radius: 10px;
    display: none;
}

#next-btn {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 30px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

#next-btn:before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: all 0.5s ease;
}

#next-btn:hover:before {
    left: 100%;
}

#next-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

#next-btn:active {
    transform: translateY(-1px);
    box-shadow: 0 3px 10px rgba(102, 126, 234, 0.4);
}

.navigation-message {
    font-size: 16px;
    color: #333;
    margin-bottom: 20px;
    line-height: 1.6;
}

.submit-section {
    text-align: center;
    margin-top: 40px;
}

#submit-btn {
    background-color: #2980b9;
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.2s ease;
}

#submit-btn:hover {
    background-color: #1e6fa5;
    transform: translateY(-2px);
}

#result {
    margin-top: 30px;
    padding: 20px;
    border-radius: 8px;
    display: none;
}

.result-header {
    font-size: 22px;
    font-weight: bold;
    margin-bottom: 15px;
    color: #2c3e50;
}

.score {
    font-size: 18px;
    margin-bottom: 20px;
    color: #333;
}

.correct-answers {
    background-color: #e8f5e9;
    color: #2e7d32;
    padding: 10px 15px;
    border-radius: 6px;
    margin-bottom: 10px;
}

.incorrect-answers {
    background-color: #ffebee;
    color: #c62828;
    padding: 10px 15px;
    border-radius: 6px;
}

/* 学伴模型选择器样式 */
.model-selector {
    position: fixed; 
    top: 40px; 
    left: 20px; 
    z-index: 1000;
    padding: 10px; 
    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 5px; 
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    display: flex; 
    flex-direction: column; 
    gap: 15px;
}

select { 
    padding: 8px 12px; 
    border: 1px solid #ccc; 
    border-radius: 4px; 
    background-color: white; 
    font-size: 14px; 
}

/* 录音控制样式 */
.recording-controls {
    position: static;  
    display: flex; 
    flex-direction: column; 
    gap: 10px; 
    margin: 0;
}

.record-button {
    width: 70px; 
    height: 70px; 
    border-radius: 50%;
    background-color: #dc3545; 
    border: none; 
    color: white;
    font-size: 16px; 
    cursor: pointer; 
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    display: flex; 
    align-items: center; 
    justify-content: center;
    opacity: 1 !important; 
    visibility: visible !important;
}

.record-button:hover { 
    background-color: #c82333; 
}

.stop-button {
    width: 70px; 
    height: 70px; 
    border-radius: 50%;
    background-color: #6c757d; /* 灰色 */
    border: none; 
    color: white;
    font-size: 16px; 
    cursor: pointer; 
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    display: flex; 
    align-items: center; 
    justify-content: center; 
    display: none;
    opacity: 1 !important; 
    visibility: visible !important;
}

/* 录音指示器样式 */
.recording-indicator {
    position: fixed; 
    bottom: 20px; 
    left: 20px; 
    z-index: 1000;
    padding: 10px 15px; 
    background-color: rgba(220, 53, 69, 0.9);
    color: white; 
    border-radius: 20px; 
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    display: none; 
    align-items: center;
}

.recording-dot {
    width: 10px; 
    height: 10px; 
    background-color: white;
    border-radius: 50%; 
    margin-right: 8px; 
    animation: pulse 1.5s infinite;
}

/* 思考中动画样式 */
.thinking-indicator {
    position: fixed; 
    bottom: 20px; 
    right: 120px; 
    z-index: 1000;
    padding: 10px 15px; 
    background-color: rgba(0, 123, 255, 0.9);
    color: white; 
    border-radius: 20px; 
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    display: none; 
    align-items: center;
}

.thinking-dots { 
    display: flex; 
    gap: 4px; 
    margin-right: 8px; 
}

.thinking-dot {
    width: 8px; 
    height: 8px; 
    background-color: white; 
    border-radius: 50%;
}

.thinking-dot:nth-child(1) { 
    animation: pulse 1.5s infinite 0s; 
}

.thinking-dot:nth-child(2) { 
    animation: pulse 1.5s infinite 0.3s; 
}

.thinking-dot:nth-child(3) { 
    animation: pulse 1.5s infinite 0.6s; 
}

/* 结果显示容器样式 */
.result-container {
    position: fixed; 
    bottom: 80px; 
    left: 20px; 
    z-index: 1000;
    padding: 15px; 
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: 8px; 
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    max-width: 400px; 
    width: 90%;
    display: none; 
    flex-direction: column; 
    gap: 10px;
}

.result-header {
    font-weight: bold; 
    color: #495057; 
    margin-bottom: 5px;
    display: flex; 
    align-items: center; 
    gap: 5px;
}

.result-header.asr { 
    color: #007bff; 
}

.result-header.feedback { 
    color: #28a745; 
}

.result-text {
    color: #333; 
    line-height: 1.5; 
    max-height: 200px; 
    overflow-y: auto;
    padding-right: 5px; 
    word-break: break-all;
}

/* 音频播放器样式 */
.audio-player-container {
    margin-top: 10px; 
    display: flex; 
    align-items: center; 
    gap: 10px;
}

.play-button {
    background-color: #28a745; 
    color: white; 
    border: none;
    border-radius: 50%; 
    width: 40px; 
    height: 40px;
    cursor: pointer; 
    display: flex; 
    align-items: center; 
    justify-content: center;
}

.play-button:hover { 
    background-color: #218838; 
}

.audio-progress {
    flex-grow: 1; 
    height: 6px; 
    background-color: #e9ecef; 
    border-radius: 3px;
    overflow: hidden; 
    cursor: pointer;
}

.progress-bar {
    height: 100%; 
    background-color: #28a745; 
    width: 0%;
}

.audio-time { 
    font-size: 12px; 
    color: #6c757d; 
}

@keyframes pulse { 
    0% { 
        opacity: 1; 
    } 
    50% { 
        opacity: 0.5; 
    } 
    100% { 
        opacity: 1; 
    } 
}

/* 在physics_quiz.css中添加多选题提示样式 */
.multiple-choice {
    color: #2196f3;
    font-size: 0.9em;
    font-weight: normal;
}