* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

body {
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
    padding: 10px;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    background-color: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

/* 头部样式 */
header {
    background: linear-gradient(135deg, #4b6cb7, #182848);
    color: white;
    padding: 25px 30px;
    border-bottom: 5px solid #3a56a4;
}

header h1 {
    font-size: 28px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.progress-container {
    margin-bottom: 20px;
}

.progress-bar {
    height: 12px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress-bar::after {
    content: '';
    display: block;
    height: 100%;
    width: 0%;
    background-color: #4cd964;
    transition: width 0.5s ease;
    border-radius: 6px;
}

.progress-text {
    font-size: 16px;
    display: flex;
    justify-content: space-between;
}

.stats {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    background-color: rgba(255, 255, 255, 0.1);
    padding: 10px 20px;
    border-radius: 10px;
    min-width: 150px;
}

.stat-item i {
    font-size: 22px;
}

.stat-item:nth-child(1) i {
    color: #4cd964;
}

.stat-item:nth-child(2) i {
    color: #ff3b30;
}

.stat-item:nth-child(3) i {
    color: #5ac8fa;
}

/* 主内容区 */
main {
    display: flex;
    min-height: 600px;
}

.content-area {
    flex: 3;
    padding: 30px;
    border-right: 1px solid #eaeaea;
}

.sidebar {
    flex: 1;
    padding: 30px;
    background-color: #f9fafc;
    min-width: 320px;
}

.question-container {
    margin-bottom: 30px;
    padding: 25px;
    background-color: #f9fafc;
    border-radius: 12px;
    border-left: 5px solid #4b6cb7;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.question-container h2 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.question-container h2 span {
    color: #4b6cb7;
    background-color: #e8edff;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 18px;
}

.question-container p {
    font-size: 18px;
    line-height: 1.8;
    color: #34495e;
    margin-bottom: 10px;
}

.question-container code {
    background-color: #f1f3f9;
    padding: 3px 8px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    color: #d35400;
}

/* 选项样式 */
.answer-container h3 {
    font-size: 20px;
    margin-bottom: 20px;
    color: #2c3e50;
    display: flex;
    align-items: center;
    gap: 10px;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.option {
    padding: 18px 25px;
    background-color: #f9fafc;
    border: 2px solid #dfe4ea;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 18px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.option:hover {
    background-color: #e8edff;
    border-color: #4b6cb7;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(75, 108, 183, 0.2);
}

.option.selected {
    background-color: #e8edff;
    border-color: #4b6cb7;
    box-shadow: 0 4px 8px rgba(75, 108, 183, 0.2);
}

.option.correct {
    background-color: #e7f7e9;
    border-color: #4cd964;
    color: #2e7d32;
}

.option.wrong {
    background-color: #ffeaea;
    border-color: #ff3b30;
    color: #c62828;
}

.option-letter {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: #4b6cb7;
    color: white;
    border-radius: 50%;
    font-weight: bold;
    flex-shrink: 0;
}

.option.correct .option-letter {
    background-color: #4cd964;
}

.option.wrong .option-letter {
    background-color: #ff3b30;
}

/* 反馈区域 */
.feedback-container {
    margin-top: 30px;
    padding: 25px;
    border-radius: 12px;
    background-color: #f9fafc;
    border-left: 5px solid #3498db;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    display: none;
}

.feedback-container.show {
    display: block;
    animation: fadeIn 0.5s;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.feedback-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    margin-bottom: 15px;
    color: #2c3e50;
}

.feedback-title.correct {
    color: #2e7d32;
}

.feedback-title.wrong {
    color: #c62828;
}

.feedback-content {
    font-size: 18px;
    line-height: 1.7;
    color: #34495e;
}

.feedback-content strong {
    color: #2c3e50;
}

/* 导航按钮 */
.navigation {
    display: flex;
    gap: 15px;
    margin-top: 40px;
    flex-wrap: wrap;
}

.nav-btn {
    padding: 15px 25px;
    border: none;
    border-radius: 10px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: all 0.3s;
    flex: 1;
    min-width: 160px;
}

#prevBtn {
    background-color: #f1f3f9;
    color: #4b6cb7;
}

#prevBtn:hover {
    background-color: #e8edff;
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(75, 108, 183, 0.3);
}

#nextBtn {
    background-color: #4b6cb7;
    color: white;
}

#nextBtn:hover {
    background-color: #3a56a4;
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(75, 108, 183, 0.3);
}

#showWrongBtn {
    background-color: #ff9800;
    color: white;
}

#showWrongBtn:hover {
    background-color: #f57c00;
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(255, 152, 0, 0.3);
}

#resetBtn {
    background-color: #e74c3c;
    color: white;
}

#resetBtn:hover {
    background-color: #c0392b;
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(231, 76, 60, 0.3);
}

/* 侧边栏样式 */
.sidebar h3 {
    font-size: 20px;
    margin-bottom: 20px;
    color: #2c3e50;
    display: flex;
    align-items: center;
    gap: 10px;
}

.question-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 30px;
    max-height: 300px;
    overflow-y: auto;
    padding-right: 10px;
}

.question-number {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #f1f3f9;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
    border: 2px solid transparent;
}

.question-number:hover {
    background-color: #e8edff;
    transform: translateY(-2px);
}

.question-number.current {
    background-color: #4b6cb7;
    color: white;
    border-color: #3a56a4;
}

.question-number.answered {
    background-color: #e7f7e9;
    border-color: #4cd964;
}

.question-number.wrong {
    background-color: #ffeaea;
    border-color: #ff3b30;
}

.wrong-questions-container {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #eaeaea;
}

.wrong-questions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    max-height: 200px;
    overflow-y: auto;
    padding-right: 10px;
}

.wrong-question-item {
    background-color: #ffeaea;
    color: #c62828;
    padding: 10px 15px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid #ffcdd2;
    font-weight: 600;
}

.wrong-question-item:hover {
    background-color: #ffcdd2;
    transform: translateY(-2px);
}

.wrong-question-item.empty {
    background-color: #f1f3f9;
    color: #7f8c8d;
    border-color: #dfe4ea;
    cursor: default;
    text-align: center;
    font-weight: normal;
}

.wrong-question-item.empty:hover {
    background-color: #f1f3f9;
    transform: none;
}

/* 页脚样式 */
footer {
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 20px;
    text-align: center;
    font-size: 16px;
}

/* 响应式设计 */
@media (max-width: 1100px) {
    main {
        flex-direction: column;
    }
    
    .sidebar {
        min-width: 100%;
        border-top: 1px solid #eaeaea;
    }
    
    .content-area {
        border-right: none;
        border-bottom: 1px solid #eaeaea;
    }
}

@media (max-width: 768px) {
    .stats {
        flex-direction: column;
        gap: 15px;
    }
    
    .stat-item {
        min-width: auto;
        width: 100%;
        justify-content: center;
    }
    
    .navigation {
        flex-direction: column;
    }
    
    .nav-btn {
        min-width: auto;
    }
    
    header h1 {
        font-size: 22px;
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .question-container h2 {
        font-size: 20px;
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .option {
        padding: 15px 20px;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}
:root {
    --progress-width: 0%;
}

.progress-bar::after {
    content: '';
    display: block;
    height: 100%;
    width: var(--progress-width);
    background-color: #4cd964;
    transition: width 0.5s ease;
    border-radius: 6px;
}/* 添加新的样式规则到现有CSS文件中 */

/* 模式选择器样式 */
.mode-selector {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.mode-btn {
    padding: 12px 25px;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    border: 2px solid transparent;
    min-width: 140px;
    justify-content: center;
    position: relative;
}

.mode-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

.mode-btn.active {
    background-color: rgba(255, 255, 255, 0.3);
    border-color: #4cd964;
    box-shadow: 0 4px 12px rgba(76, 217, 100, 0.3);
}

.mode-btn .badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background-color: #ff3b30;
    color: white;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: bold;
}

/* 模式指示器 */
.mode-indicator {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 3px 10px;
    border-radius: 15px;
    font-size: 14px;
    margin-left: 10px;
}

/* 正确率统计 */
#accuracyStat {
    display: flex !important;
}

/* 背题模式提示 */
.review-mode-tip {
    background: linear-gradient(135deg, #ffd166, #ffb347);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 25px;
    box-shadow: 0 5px 15px rgba(255, 179, 71, 0.3);
    border-left: 5px solid #ff9500;
    display: none;
}

.review-mode-tip.show {
    display: block;
    animation: slideDown 0.5s;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.tip-header {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 600;
    color: #d35400;
    margin-bottom: 15px;
}

.tip-content p {
    color: #2c3e50;
    margin-bottom: 10px;
    font-weight: 500;
}

.tip-content ul {
    margin: 15px 0;
    padding-left: 20px;
}

.tip-content li {
    margin-bottom: 8px;
    color: #34495e;
    display: flex;
    align-items: center;
    gap: 10px;
}

.tip-content li i {
    color: #e67e22;
    width: 20px;
}

.tip-close-btn {
    background-color: #e67e22;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.3s;
    margin-top: 10px;
}

.tip-close-btn:hover {
    background-color: #d35400;
}

/* 背题模式答案显示区域 */
.review-answer-container {
    margin-top: 25px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    display: none;
}

.review-answer-container.show {
    display: block;
    animation: fadeIn 0.5s;
}

.review-answer-header {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    padding: 15px 25px;
    font-size: 18px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.review-answer-content {
    padding: 25px;
    background-color: #f8fafc;
    border-left: 5px solid #3498db;
}

.review-answer-content .correct-answer {
    font-size: 18px;
    margin-bottom: 15px;
    color: #2c3e50;
}

.review-answer-content .correct-answer strong {
    color: #2980b9;
}

.review-answer-content .explanation {
    font-size: 16px;
    line-height: 1.7;
    color: #34495e;
    padding-top: 15px;
    border-top: 1px solid #eaeaea;
}

.review-answer-content .explanation strong {
    color: #2c3e50;
}

/* 标记题目容器 */
.marked-questions-container {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #eaeaea;
}

.marked-questions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    max-height: 150px;
    overflow-y: auto;
    padding-right: 10px;
}

.marked-question-item {
    background-color: #e8f4fc;
    color: #2980b9;
    padding: 10px 15px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid #b8dcf9;
    font-weight: 600;
}

.marked-question-item:hover {
    background-color: #d4e9f9;
    transform: translateY(-2px);
}

.marked-question-item.empty {
    background-color: #f1f3f9;
    color: #7f8c8d;
    border-color: #dfe4ea;
    cursor: default;
    text-align: center;
    font-weight: normal;
}

.marked-question-item.empty:hover {
    background-color: #f1f3f9;
    transform: none;
}

/* 错题模式特殊样式 */
.wrong-mode-banner {
    background: linear-gradient(135deg, #ff6b6b, #ff4757);
    color: white;
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
}

.wrong-mode-banner.hidden {
    display: none;
}

.wrong-mode-banner i {
    font-size: 24px;
}

.wrong-mode-banner .banner-text {
    flex: 1;
    margin-left: 15px;
}

.wrong-mode-banner .banner-text h4 {
    margin: 0 0 5px 0;
    font-size: 18px;
}

.wrong-mode-banner .banner-text p {
    margin: 0;
    font-size: 14px;
    opacity: 0.9;
}

.wrong-mode-banner .close-banner {
    background: none;
    border: none;
    color: white;
    font-size: 20px;
    cursor: pointer;
    padding: 0 5px;
}

/* 标记按钮样式 */
#markBtn {
    background-color: #3498db;
    color: white;
}

#markBtn:hover {
    background-color: #2980b9;
}

#markBtn.marked {
    background-color: #9b59b6;
}

#markBtn.marked:hover {
    background-color: #8e44ad;
}

/* 页脚提示 */
.footer-tip {
    font-size: 14px;
    opacity: 0.8;
    margin-top: 10px;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .mode-selector {
        flex-direction: column;
    }
    
    .mode-btn {
        min-width: auto;
        justify-content: center;
    }
    
    .wrong-mode-banner {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }
    
    .wrong-mode-banner .banner-text {
        margin-left: 0;
    }
}