/* file name: sequential.css - 顺序练习页面样式（修复版） */
#sequential-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* 练习头部 */
.practice-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: white;
    padding: 20px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 20px;
}

.header-left h2 {
    color: var(--primary);
    margin-bottom: 10px;
}

/* 顶部统计样式 */
.practice-info {
    display: flex;
    gap: 20px;
    margin-top: 5px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.info-item i {
    color: var(--primary);
    font-size: 1rem;
}

.header-right {
    display: flex;
    gap: 10px;
}

/* 顺序练习容器 */
#sequential-content .practice-container {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 20px;
    min-height: 600px; /* 固定最小高度 */
}

/* 题目面板 */
.question-panel {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 25px;
    display: flex;
    flex-direction: column;
    height: fit-content; /* 自适应高度 */
    min-height: 500px; /* 最小高度 */
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #eee;
}

.question-meta {
    display: flex;
    align-items: center;
    gap: 15px;
}

.question-type {
    background: #f0f4ff;
    color: var(--primary);
    padding: 6px 12px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.question-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.question-chapter {
    background: #f8f9fa;
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.9rem;
}

/* 题目内容 */
.question-content {
    flex: 1;
}

.question-text {
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 25px;
    padding: 20px;
    background: #f8f9ff;
    border-radius: 8px;
    border-left: 4px solid var(--primary);
}

/* 选项样式 */
.question-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 25px;
}

.option-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    padding: 15px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.option-item:hover {
    border-color: var(--primary-light);
    background: #f8f9ff;
}

.option-item.selected {
    border-color: var(--primary);
    background: #f0f4ff;
}

.option-item.correct {
    border-color: #28a745;
    background: #e8f5e9;
}

.option-item.incorrect {
    border-color: #dc3545;
    background: #ffebee;
}

.option-item.correct .option-letter {
    background: #28a745;
    color: white;
}

.option-item.incorrect .option-letter {
    background: #dc3545;
    color: white;
}

/* 加载状态选项 */
.option-item.loading {
    opacity: 0.7;
    cursor: wait;
}

.option-item.loading .option-letter {
    background: #e9ecef;
    color: #999;
}

.option-item.loading .option-text {
    color: #999;
    font-style: italic;
}

.option-letter {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    background: #f0f0f0;
    border-radius: 50%;
    font-weight: 700;
    flex-shrink: 0;
}

.option-item.selected .option-letter {
    background: var(--primary);
    color: white;
}

.option-text {
    flex: 1;
    line-height: 1.5;
}

/* 答案解析 */
.answer-analysis {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 20px;
    margin-top: 20px;
    border-left: 4px solid #28a745;
    animation: fadeIn 0.3s ease;
}

.analysis-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.analysis-header i {
    color: #28a745;
    font-size: 1.2rem;
}

.analysis-header h4 {
    margin: 0;
    color: #333;
}

.analysis-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.correct-answer {
    font-size: 1rem;
    line-height: 1.5;
}

.analysis-text p {
    margin: 0;
    line-height: 1.6;
    color: #555;
}

/* 题目操作 */
.question-actions {
    display: flex;
    justify-content: space-between;
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

/* 右侧状态面板 */
.status-panel {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 20px;
}

.status-header {
    margin-bottom: 20px;
}

.status-header h3 {
    color: var(--primary);
    margin-bottom: 15px;
}

.progress-summary {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.progress-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    cursor: pointer;
}

/* 筛选按钮激活状态 */
.progress-item.active {
    font-weight: bold;
    color: var(--primary);
}

.progress-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

/* 状态点样式 */
.progress-dot.all {
    background: #6c757d;
}

.progress-dot.answered {
    background: var(--primary);
}

.progress-dot.correct {
    background: #28a745;
}

.progress-dot.incorrect {
    background: #dc3545;
}

.progress-dot.marked {
    background: #ffc107;
}

.progress-dot.unanswered {
    background: #e9ecef;
    border: 1px solid #dee2e6;
}

/* 防止题目状态网格滚动传播到父元素 */
.question-status-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
    margin-bottom: 20px;
    max-height: 280px;
    overflow-y: auto; /* 确保垂直滚动 */
    overflow-x: hidden; /* 隐藏水平滚动 */
    padding: 5px;
    /* 防止滚动传播 */
    overscroll-behavior: contain; /* 重要：防止滚动传播 */
    -webkit-overflow-scrolling: touch; /* iOS 平滑滚动 */
}

/* 题目状态基础样式 */
.question-status {
    width: 100%;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid transparent;
    border-radius: 6px;
    background: white;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    transition: var(--transition);
    position: relative;
}

.question-status:hover {
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* 当前题目 - 蓝色边框 */
.question-status.current {
    border-color: #17a2b8 !important;
    color: #17a2b8 !important;
    background: white !important;
    z-index: 10;
}

/* 已答题目 - 蓝色背景 */
.question-status.answered {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* 正确题目 - 绿色背景 */
.question-status.correct {
    background: #28a745;
    color: white;
    border-color: #28a745;
}

/* 错误题目 - 红色背景 */
.question-status.incorrect {
    background: #dc3545;
    color: white;
    border-color: #dc3545;
}

/* 未答题目 - 白色背景，灰色边框（存在感低） */
.question-status.unanswered {
    background: white !important;
    border-color: #dee2e6 !important;
    color: #666;
}

/* 已答正确题目 */
.question-status.answered.correct {
    background: #28a745;
    color: white;
    border-color: #28a745;
}

/* 已答错误题目 */
.question-status.answered.incorrect {
    background: #dc3545;
    color: white;
    border-color: #dc3545;
}

/* 当前题目与其他状态叠加 */
.question-status.current.answered {
    border-color: #17a2b8 !important;
    color: #17a2b8 !important;
    background: white !important;
}

.question-status.current.correct {
    border-color: #17a2b8 !important;
    color: #17a2b8 !important;
    background: white !important;
}

.question-status.current.incorrect {
    border-color: #17a2b8 !important;
    color: #17a2b8 !important;
    background: white !important;
}

.question-status.current.unanswered {
    border-color: #17a2b8 !important;
    color: #17a2b8 !important;
    background: white !important;
}

/* 标记图标样式 - 只显示小点，不影响边框 */
.question-status.marked-icon::after {
    content: '';
    position: absolute;
    top: 2px;
    right: 2px;
    width: 6px;
    height: 6px;
    background: #ffc107;
    border-radius: 50%;
    border: 1px solid rgba(0,0,0,0.2);
}

/* 不同状态下的标记图标颜色 */
.question-status.unanswered.marked-icon::after {
    background: #ffc107;
}

.question-status.correct.marked-icon::after {
    background: white;
}

.question-status.incorrect.marked-icon::after {
    background: white;
}

.question-status.current.marked-icon::after {
    background: #17a2b8;
}

.question-status.answered.marked-icon::after {
    background: white;
}

/* 紧凑布局样式 */
.status-stats.compact-layout {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
    padding: 12px;
    background: #f8f9fa;
    border-radius: 8px;
    min-height: 85px;
}

/* 第一行：统计数字 */
.stats-top-row {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    width: 100%;
}

/* 统计项样式 */
.stat-item.compact {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 6px 8px;
    background: white;
    border-radius: 6px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    min-width: 0;
}

.stat-item.compact .stat-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
    text-align: center;
}

.stat-item.compact .stat-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
    text-align: center;
}

/* 第二行：进度条 */
.stats-bottom-row {
    display: flex;
    flex-direction: column;
    gap: 5px;
    width: 100%;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.progress-info-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.progress-info-value {
    font-weight: 600;
    color: var(--primary);
    font-size: 0.9rem;
}

/* 进度条样式 */
.progress-bar-container {
    position: relative;
    width: 100%;
    height: 8px;
    background: #e9ecef;
    border-radius: 4px;
    overflow: hidden;
    margin-top: 5px;
}

.progress-fill {
    position: relative;
    height: 100%;
    border-radius: 4px;
    background: var(--primary);
    transition: all 0.5s ease;
    width: 0%;
    min-width: 0;
}

/* 双色进度条样式（通过JS设置） */
.progress-fill.correct-incorrect {
    background: linear-gradient(to right, 
        #28a745 0%, 
        #28a745 var(--correct-percent, 0%), 
        #dc3545 var(--correct-percent, 0%), 
        #dc3545 var(--total-percent, 0%), 
        transparent var(--total-percent, 0%), 
        transparent 100%);
}

/* 进度条计数标签样式 */
.progress-count-label {
    position: absolute;
    top: -22px;
    transform: translateX(-50%);
    font-size: 0.7rem;
    font-weight: bold;
    padding: 2px 4px;
    border-radius: 3px;
    white-space: nowrap;
    z-index: 10;
    min-width: 20px;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.progress-count-label.correct-label {
    background: #28a745;
    color: white;
}

.progress-count-label.incorrect-label {
    background: #dc3545;
    color: white;
}

/* 统计数值强调 */
#answered-count-top,
#accuracy-rate-top,
#answered-count,
#accuracy-rate {
    color: var(--primary);
    font-weight: 700;
    font-size: 1.1rem;
}

/* 练习设置 */
.practice-settings {
    border-top: 1px solid #eee;
    padding-top: 20px;
}

.practice-settings h4 {
    margin-bottom: 15px;
    color: var(--text-primary);
}

.setting-item {
    margin-bottom: 12px;
    display: flex;
    align-items: center;
}

.setting-item label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.setting-item input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

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

/* 响应式设计 */
@media (max-width: 1024px) {
    #sequential-content .practice-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .practice-header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
    
    .practice-info {
        flex-direction: column;
        gap: 10px;
    }
    
    .info-item {
        font-size: 0.9rem;
    }
    
    .question-header {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }
    
    .question-actions {
        flex-direction: column;
        gap: 10px;
    }
    
    .question-status-grid {
        grid-template-columns: repeat(4, 1fr);
        max-height: 200px;
        overscroll-behavior: contain;
    }

    .status-stats.compact-layout {
        min-height: 80px;
        padding: 10px;
    }
    
    .stats-top-row {
        gap: 8px;
    }
    
    .stat-item.compact {
        padding: 5px 6px;
    }
}

@media (max-width: 480px) {
    .question-status-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .question-text {
        padding: 15px;
    }
    
    .option-item {
        padding: 12px;
    }

    .status-stats.compact-layout {
        min-height: 75px;
        gap: 8px;
    }
    
    .stat-item.compact .stat-label {
        font-size: 0.7rem;
    }
    
    .stat-item.compact .stat-value {
        font-size: 1rem;
    }
    
    .progress-info {
        font-size: 0.75rem;
    }
    
    .progress-info-value {
        font-size: 0.85rem;
    }
    
    .question-status-grid {
        max-height: 180px;
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 移动设备上的特别调整 */
@media (max-width: 375px) {
    .stats-top-row {
        flex-direction: column;
        gap: 5px;
    }
    
    .stat-item.compact {
        flex-direction: row;
        justify-content: space-between;
        padding: 4px 6px;
    }
    
    .stat-item.compact .stat-label {
        margin-bottom: 0;
        text-align: left;
        width: auto;
    }
    
    .stat-item.compact .stat-value {
        text-align: right;
        width: auto;
        min-width: 40px;
    }
}