/* ==================== 备考错题本 - 现代化样式 ==================== */

:root {
    --primary-color: #f97316;
    --secondary-color: #ea580c;
    --accent-color: #f59e0b;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    
    --bg-light: #F5F4F0;
    --bg-white: #ffffff;
    --light-color: #F5F4F0;
    --light-gray: #e9ecef;
    --medium-gray: #cbd5e1;
    --dark-gray: #64748b;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-muted: #999999;
    --dark-color: #1e293b;
    
    --border-color: #dee2e6;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.15);
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-light);
    color: var(--text-primary);
    line-height: 1.6;
}

/* 主容器样式 */
div.container-fluid {
    padding-top: 4px;
    padding-bottom: 4px;
}

/* ==================== 顶部导航栏 ==================== */
.top-navbar,
.navbar {
    background: #F5F4F0;
    padding: 12px 20px;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
}

/* 顶部导航栏 - 右侧用户信息区域左移 */
.top-navbar .container-fluid > div:last-child,
.navbar .container-fluid > div:last-child {
    margin-right: 80px;
}

.top-navbar .navbar-brand,
.navbar .navbar-brand {
    color: #f97316 !important;
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.top-navbar .navbar-brand:hover,
.navbar .navbar-brand:hover {
    color: #ea580c !important;
    opacity: 0.9;
}

.navbar-date {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.navbar-target {
    color: #f97316;
    font-size: 0.9rem;
    font-weight: 500;
    background: rgba(249, 115, 22, 0.1);
    padding: 4px 12px;
    border-radius: 16px;
}

.navbar-target strong {
    color: #ea580c;
    font-size: 1rem;
}

.navbar .nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    transition: all 0.3s ease;
}

.navbar .nav-link:hover {
    color: var(--primary-color) !important;
}

.navbar .nav-link.active {
    color: var(--primary-color) !important;
    background: rgba(102, 126, 234, 0.1);
    border-radius: var(--radius-md);
}

.subtitle {
    color: var(--text-secondary) !important;
    font-size: 0.95rem;
    border-left: 2px solid var(--medium-gray);
    padding-left: 10px;
}

.date-badge {
    background: rgba(255,255,255,0.2);
    color: white !important;
    padding: 5px 14px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.25);
}

.btn-status {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    border: none;
    color: white !important;
    font-weight: 600;
    padding: 7px 18px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.btn-status:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    color: white !important;
}

.btn-action {
    background: #F5F4F0 !important;
    color: var(--text-secondary) !important;
    border: 1px solid var(--border-color) !important;
    font-weight: 500;
    padding: 7px 16px;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.btn-action:hover {
    background: var(--primary-color) !important;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
    color: white !important;
    border-color: var(--primary-color) !important;
}

/* ==================== 标签页导航 ==================== */
.tab-navigation {
    background: #F5F4F0;
    border-bottom: 2px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    margin-bottom: 12px;
    position: sticky;
    top: 70px;
    z-index: 999;
}

.tab-navigation-simple {
    background: #F5F4F0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 12px;
}

.tab-navigation-simple .custom-tabs {
    gap: 0;
}

.custom-tabs {
    border: none;
    gap: 8px;
    padding: 0 20px;
}

.custom-tabs .nav-link {
    border: none;
    color: var(--text-secondary);
    font-weight: 600;
    padding: 16px 24px;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
    transition: all 0.3s ease;
    position: relative;
    background: transparent;
}

.custom-tabs .nav-link:hover {
    color: var(--primary-color);
    background: rgba(74,144,226,0.05);
}

.custom-tabs .nav-link.active {
    color: var(--primary-color);
    background: #F5F4F0;
    font-weight: 700;
}

.custom-tabs .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 3px;
    background: var(--primary-color);
}

/* ==================== 主内容区域 ==================== */
.main-wrapper {
    padding: 20px 30px;
    min-height: calc(100vh - 200px);
}

/* ==================== 统计卡片区域 ==================== */
.stat-card {
    background: #F5F4F0;
    border-radius: var(--radius-lg);
    padding: 18px 16px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-card-total::before { background: linear-gradient(90deg, #f97316, #ea580c); }
.stat-card-error::before { background: linear-gradient(90deg, #f093fb, #f5576c); }
.stat-card-guess::before { background: linear-gradient(90deg, #4facfe, #00f2fe); }
.stat-card-time::before { background: linear-gradient(90deg, #a78bfa, #7c3aed); }
.stat-card-untested::before { background: linear-gradient(90deg, #43e97b, #38f9d7); }

.stat-number {
    font-size: 2.8rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 8px;
}

.stat-card-total .stat-number {
    background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-card-error .stat-number {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-card-guess .stat-number {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-card-time .stat-number {
    background: linear-gradient(135deg, #a78bfa 0%, #7c3aed 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-card-untested .stat-number {
    background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 徽章样式 - 计数类徽章数字颜色为白色（不影响标签tag-badge） */
#selectedCount .badge.bg-primary,
.badge.bg-primary,
.badge.bg-danger,
.badge.bg-warning,
.badge.bg-info,
.badge.bg-success,
.badge.bg-secondary,
.badge.bg-dark {
    color: #ffffff !important;
}

/* 标签徽章 - 默认橙色样式（与错题管理一致），允许内联样式覆盖（统计页面随机颜色） */
.badge.tag-badge {
    padding: 0.25rem 0.6rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

/* 列表页面的标签默认浅橙底橙字（不使用!important，允许统计页面覆盖） */
.question-list-item .tag-badge,
.practice-list-item .tag-badge,
.knowledge-list-item .tag-badge,
.vocabulary-list-item .tag-badge,
.discrimination-list-item .tag-badge,
.essay-list-item .knowledge-list-tags .tag-badge {
    background-color: rgba(249, 115, 22, 0.1);
    color: var(--primary-color);
}

/* 统计卡片区域样式 */
#questionStatistics,
#practiceStatistics,
#knowledgeStatistics,
#vocabularyStatistics {
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ==================== 筛选工具栏 ==================== */
.filter-toolbar {
    background: #F5F4F0;
    padding: 12px 16px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    margin-bottom: 8px;
}

.filter-select,
.filter-date,
.filter-input {
    min-width: 140px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    background-color: #F5F4F0;
    padding: 0.35rem 0.6rem;
}

.filter-select:focus,
.filter-date:focus,
.filter-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74,144,226,0.1);
}

.filter-btn {
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.filter-btn:hover {
    background: var(--primary-color) !important;
    color: white !important;
    transform: translateY(-1px);
}

.filter-btn .badge {
    transition: all 0.3s ease;
}

.search-input-group {
    position: relative;
    width: 100%;
}

.search-input-group .search-icon,
.input-clear-wrapper .search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    z-index: 5;
    font-size: 14px;
}

.search-input-group input {
    padding-left: 40px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    background-color: #F5F4F0;
    padding-top: 0.35rem;
    padding-bottom: 0.35rem;
}

.search-input-group input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74,144,226,0.1);
}

/* 输入框清除按钮 */
.input-clear-wrapper {
    position: relative;
    display: inline-block;
}

.input-clear-wrapper .clear-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    background: #e0e0e0;
    border: none;
    border-radius: 50%;
    color: #666;
    cursor: pointer;
    width: 18px;
    height: 18px;
    font-size: 14px;
    line-height: 1;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.input-clear-wrapper .clear-btn:hover {
    background: #ccc;
    color: #333;
}

.result-count {
    font-size: 0.95rem;
    color: var(--text-secondary);
    padding: 8px 16px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    font-weight: 600;
}

.result-count strong {
    color: var(--primary-color);
    font-size: 1.1rem;
}

/* ==================== 操作工具栏 ==================== */
.action-toolbar {
    background: #F5F4F0;
    padding: 10px 16px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    margin-bottom: 12px;
}

.question-card {
    background: #F5F4F0;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: none;
    border-left: 4px solid var(--primary-color);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    position: relative;
    height: auto !important;
    min-height: 200px;
    overflow: visible !important;
}

.question-card:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.question-card .card-body {
    border: none !important;
    padding: 0 !important;
}

.question-card .card-header {
    border: none !important;
    padding: 0 !important;
    margin-bottom: 0 !important;
}

.question-card .card-footer {
    border: none !important;
    padding: 0 !important;
}

.question-card.selected {
    background: rgba(249, 115, 22, 0.12) !important;
}

.question-card.selected .tag-item {
    background: rgba(249, 115, 22, 0.2) !important;
}

.question-card.selected .question-footer-info {
    background: transparent !important;
}

/* 通用卡片选中样式 - 与错题管理一致 */
.card.selected,
.practice-card.selected,
.knowledge-card.selected,
.vocabulary-card.selected,
.discrimination-card.selected,
.essay-card.selected,
.question-list-item.selected,
.knowledge-list-item.selected,
.vocabulary-list-item.selected,
.practice-list-item.selected,
.discrimination-list-item.selected,
.essay-list-item.selected {
    background: rgba(249, 115, 22, 0.15) !important;
}

/* 选中时子元素背景透明，确保整体变色 */
.card.selected .card-header,
.card.selected .card-body,
.card.selected .card-footer,
.practice-card.selected .card-header,
.practice-card.selected .card-body,
.practice-card.selected .card-footer,
.knowledge-card.selected .card-header,
.knowledge-card.selected .card-body,
.knowledge-card.selected .card-footer,
.vocabulary-card.selected .card-header,
.vocabulary-card.selected .card-body,
.vocabulary-card.selected .card-footer,
.discrimination-card.selected .discrimination-card-header,
.discrimination-card.selected .discrimination-card-body,
.discrimination-card.selected .discrimination-card-footer {
    background: transparent !important;
}

.question-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-color), #ea580c);
    opacity: 1;
    transition: background 0.3s ease;
}

/* 已复盘的卡片 - 绿色左边框 */
.question-card.reviewed::before {
    background: linear-gradient(180deg, #28a745, #20c997);
}

/* 未复盘的卡片 - 橙色左边框 */
.question-card.unreviewed::before {
    background: linear-gradient(180deg, #fd7e14, #ffc107);
}

.question-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.question-footer-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding: 0.75rem 1.25rem;
    background-color: #F5F4F0;
    border-radius: 0 0 12px 12px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* 错题次数显示 - 图标文字间距8px（与申论页面一致） */
.error-count {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #dc3545;
}

/* 最后错误时间显示 - 图标文字间距8px（与申论页面一致） */
.last-error-time {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ==================== 统一元数据信息样式（仅应用于错题/知识点/申论页面） ==================== */
.question-list-meta .meta-info,
.knowledge-list-meta .meta-info {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 4px 10px;
    font-size: 12px !important;
    font-weight: 500;
    color: var(--text-secondary);
    line-height: 1.5;
}

.question-list-meta .meta-info i,
.knowledge-list-meta .meta-info i {
    font-size: 13px;
}

/* 来源信息 - 灰色图标 */
.meta-info-source i {
    color: #6c757d;
}

/* 错误次数 - 红色图标 */
.meta-info-error i {
    color: #dc3545;
}

/* 时间信息 - 蓝色图标 */
.meta-info-time i {
    color: #17a2b8;
}

/* 分数信息 - 黄色/橙色图标 */
.meta-info-score i {
    color: #f97316;
}

/* 引用数信息 - 橙色图标 */
.meta-info-refs i {
    color: #f97316;
}

.question-card-header {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    padding: 0.5rem 0.75rem;
    position: absolute;
    top: 0;
    right: 0;
    z-index: 10;
}

.question-actions {
    display: flex;
    gap: 0.25rem;
    flex-shrink: 0;
}

.btn-card-action {
    background: none !important;
    border: none !important;
    color: var(--text-muted) !important;
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn-card-action:hover {
    color: var(--primary-color) !important;
    background: rgba(74,144,226,0.05) !important;
    transform: none;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.status-badge.wrong {
    background: rgba(220,53,69,0.1);
    color: var(--danger-color);
    border: 1px solid rgba(220,53,69,0.2);
}

.status-badge.guess {
    background: rgba(255,193,7,0.1);
    color: #d39e00;
    border: 1px solid rgba(255,193,7,0.2);
}

.status-badge.untested {
    background: rgba(108,117,125,0.1);
    color: #6c757d;
    border: 1px solid rgba(108,117,125,0.2);
}

.status-badge.reviewed-badge {
    background: rgba(40,167,69,0.1);
    color: var(--success-color);
    border: 1px solid rgba(40,167,69,0.2);
}

.status-badge.unreviewed-badge {
    background: rgba(253,126,20,0.1);
    color: #fd7e14;
    border: 1px solid rgba(253,126,20,0.2);
}

.subject-tag {
    display: inline-block;
    background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
}

.question-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-right: 1rem;
}

.question-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.meta-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.meta-item i {
    color: var(--primary-color);
    width: 16px;
    text-align: center;
}

.question-content {
    padding: 0rem 1.25rem 0 1.25rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    max-height: 150px;
    overflow: hidden;
    position: relative;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.question-content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0.5rem 0;
}

.question-content p {
    margin-bottom: 0.5rem;
}

.question-content ul,
.question-content ol {
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
}

.question-content blockquote {
    border-left: 3px solid var(--primary-color);
    padding-left: 1rem;
    margin: 0.5rem 0;
    color: var(--text-secondary);
}

.question-content code {
    background-color: rgba(0, 0, 0, 0.05);
    padding: 0.125rem 0.375rem;
    border-radius: 4px;
    font-size: 0.875rem;
}

.question-content pre {
    background-color: rgba(0, 0, 0, 0.05);
    padding: 0.75rem;
    border-radius: 6px;
    overflow-x: auto;
    margin: 0.5rem 0;
    font-size: 0.85rem;
}

.question-tags {
    padding: 0 1.25rem 0 1.25rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag-item {
    background-color: rgba(249, 115, 22, 0.1);
    color: var(--primary-color);
    margin-right: 5px;
    margin-bottom: 5px;
    display: inline-block;
    padding: 0.25rem 0.6rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.tag-item:hover {
    background-color: rgba(249, 115, 22, 0.2);
}

.question-card.selected .tag-item {
    background: rgba(249, 115, 22, 0.2) !important;
}

.question-list-item {
    background: #F5F4F0;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: none;
    border-left: 4px solid #fd7e14;
    cursor: pointer;
    display: flex;
    align-items: center;
    padding: 12px 16px;
    gap: 16px;
}

.question-list-item:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    transform: translateY(-2px);
}

.question-list-item.selected {
    background: rgba(249, 115, 22, 0.12) !important;
}

.question-list-item.reviewed {
    border-left: 4px solid #28a745 !important;
}

.question-list-item.unreviewed {
    border-left: 4px solid #fd7e14 !important;
}

.question-list-item .question-list-content {
    flex: 1;
    min-width: 0;
}

.question-list-preview {
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: 6px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.question-list-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
}

.question-list-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.question-list-meta .meta-source {
    white-space: nowrap;
}

.question-list-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
}

.question-table {
    background: #F5F4F0;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.question-table thead th {
    background: linear-gradient(135deg, #F5F4F0 0%, #e9ecef 100%);
    font-weight: 700;
    color: var(--text-primary);
    border-bottom-width: 2px;
    padding: 16px 12px;
    white-space: nowrap;
}

.question-table tbody td {
    vertical-align: middle;
    padding: 14px 12px;
    border-bottom: 1px solid var(--border-color);
}

.question-table tbody tr:hover {
    background-color: rgba(74,144,226,0.03);
}

.table-status-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.table-status-icon.wrong {
    background: rgba(220,53,69,0.1);
    color: var(--danger-color);
}

.table-status-icon.correct {
    background: rgba(40,167,69,0.1);
    color: var(--success-color);
}

/* ==================== 浮动添加按钮 ==================== */
.floating-add-btn,
.add-btn,
.btn.add-btn,
.btn.floating-add-btn {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 60px;
    height: 60px;
    border-radius: 50% !important;
    background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
    color: white;
    font-size: 1.6rem;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    transition: all 0.3s ease;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.floating-add-btn:hover,
.add-btn:hover,
.btn.add-btn:hover,
.btn.floating-add-btn:hover {
    transform: scale(1.1) rotate(90deg);
    box-shadow: 0 12px 30px rgba(249, 115, 22, 0.4);
    color: white;
    background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
}

.floating-add-btn i {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

/* ==================== 浮动按钮组（返回/保存） ==================== */
.floating-buttons {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    z-index: 1000;
}

/* 关联词汇按钮样式 */
div#home-panel > div.filter-toolbar:nth-child(2) > div.row > div.col-auto:nth-child(5) > button.btn {
    border-width: 1px;
    border-style: solid;
    border-color: #b8b7b7;
}

/* 关联知识点按钮样式 */
div#home-panel > div.filter-toolbar:nth-child(2) > div.row > div.col-auto:nth-child(6) > button.btn {
    border-width: 1px;
    border-style: solid;
    border-color: #b8b7b7;
}

/* 错题管理统计样式 */
div#home-panel > div.row {
    margin-top: -28px;
    margin-bottom: -28px;
}

.floating-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    text-decoration: none;
    color: white;
    font-size: 1.2rem;
    border: none;
    cursor: pointer;
}

.floating-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.floating-btn.back {
    background: linear-gradient(135deg, var(--dark-gray), var(--dark-color));
}

.floating-btn.edit,
.floating-btn.save {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

@media (max-width: 768px) {
    .floating-buttons {
        bottom: 1rem;
        right: 1rem;
    }
    .floating-btn {
        width: 48px;
        height: 48px;
        font-size: 1rem;
    }
}

/* ==================== 模态框样式优化 ==================== */
.modal-header-primary {
    background: linear-gradient(135deg, #f97316 0%, #ea580c 100%) !important;
    border: none;
    padding: 18px 24px;
}

.modal-content {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.modal-body {
    padding: 28px 24px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-light);
}

/* ==================== 加载状态 ==================== */
#loadingSpinner {
    display: none;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px 20px;
    min-height: 400px;
    background: #F5F4F0;
    border-radius: var(--radius-lg);
    border: 2px dashed var(--border-color);
}

.empty-state i {
    font-size: 4rem;
    color: var(--text-muted);
    opacity: 0.4;
    margin-bottom: 20px;
}

.empty-state h4 {
    font-size: 1.25rem;
    color: #495057;
    margin-bottom: 10px;
}

.empty-state p {
    font-size: 1rem;
    color: #6c757d;
    margin-bottom: 20px;
}

.empty-state .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 500;
    gap: 8px;
    min-height: 44px;
    transition: all 0.3s ease;
}

.empty-state .btn i {
    font-size: 1rem;
    color: #fff !important;
    opacity: 1 !important;
    margin-bottom: 0;
}

.empty-state .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(249, 115, 22, 0.4);
}

.empty-icon {
    font-size: 5rem;
    color: var(--text-muted);
    opacity: 0.5;
}

/* ==================== 标签样式 ==================== */
.tag-badge {
    background-color: rgba(249, 115, 22, 0.1);
    color: var(--primary-color);
    margin-right: 5px;
    margin-bottom: 5px;
    display: inline-block;
    padding: 0.25rem 0.6rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.tag-badge:hover {
    background-color: rgba(249, 115, 22, 0.2);
}

/* ==================== 分页样式 ==================== */
.pagination-wrapper {
    background: #F5F4F0;
    padding: 20px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.pagination .page-link {
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 14px;
    margin: 0 3px;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    font-weight: 600;
}

.pagination .page-link:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.pagination .page-item.active .page-link {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

/* ==================== 响应式设计 ==================== */

/* ---------- 平板横屏 (<=992px) ---------- */
@media (max-width: 992px) {
    .main-wrapper {
        padding: 15px 20px;
    }

    .filter-toolbar .row > * {
        margin-bottom: 10px;
    }

    .stat-number {
        font-size: 2.2rem;
    }

    .floating-add-btn {
        bottom: 25px;
        right: 25px;
        width: 54px;
        height: 54px;
        font-size: 1.4rem;
    }

    /* 导航栏：隐藏日期和目标，缩小品牌名 */
    .navbar-date,
    .navbar-target {
        display: none !important;
    }

    .top-navbar .navbar-brand,
    .navbar .navbar-brand {
        font-size: 1.2rem;
    }

    /* 标签页导航：减小内边距 */
    .custom-tabs {
        padding: 0 12px;
        gap: 2px;
    }

    .custom-tabs .nav-link {
        padding: 12px 14px;
        font-size: 0.85rem;
    }

    /* 筛选工具栏：允许换行 */
    .filter-toolbar .row {
        flex-wrap: wrap;
    }

    .filter-toolbar .col-auto {
        flex: 0 0 auto;
    }

    /* 操作工具栏：允许换行 */
    .action-toolbar .d-flex {
        flex-wrap: wrap;
        gap: 8px !important;
    }
}

/* ---------- 平板竖屏/大手机 (<=768px) ---------- */
@media (max-width: 768px) {
    .top-navbar {
        padding: 10px 15px;
    }

    .subtitle {
        display: none;
    }

    .date-badge {
        font-size: 0.82rem;
        padding: 4px 10px;
    }

    .btn-action span {
        display: none;
    }

    .custom-tabs .nav-link {
        padding: 12px 16px;
        font-size: 0.9rem;
    }

    .filter-toolbar {
        padding: 15px;
    }

    .stat-card {
        padding: 18px 15px;
    }

    .stat-number {
        font-size: 1.8rem;
    }

    .question-card {
        padding: 18px;
    }

    /* ====== 导航栏适配（移动端核心） ====== */
    .top-navbar .container-fluid > div:last-child,
    .navbar .container-fluid > div:last-child {
        margin-right: 0;
    }

    .top-navbar .navbar-brand,
    .navbar .navbar-brand {
        font-size: 1.1rem;
    }

    .top-navbar .navbar-brand i,
    .navbar .navbar-brand i {
        font-size: 1rem;
    }

    /* 用户下拉菜单按钮文字隐藏，只显示图标 */
    #userDropdown .dropdown-toggle span {
        display: none;
    }

    #userDropdown .dropdown-toggle {
        padding: 6px 10px;
    }

    /* 登录按钮缩小 */
    #loginButton {
        padding: 6px 12px;
        font-size: 0.85rem;
    }

    #loginButton i {
        display: inline-block;
    }

    #loginButton span {
        display: none;
    }

    /* ====== 标签页导航：横向滚动（移动端核心） ====== */
    .tab-navigation {
        position: sticky;
        top: 56px; /* 移动端导航栏更矮 */
        z-index: 999;
        overflow-x: auto;
        overflow-y: hidden;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none; /* Firefox */
    }

    .tab-navigation::-webkit-scrollbar {
        display: none; /* Chrome/Safari */
    }

    .tab-navigation .container-fluid {
        padding: 0;
        min-width: max-content;
    }

    .custom-tabs {
        padding: 0 10px;
        gap: 0;
        flex-wrap: nowrap;
    }

    .custom-tabs .nav-link {
        padding: 12px 12px;
        font-size: 0.82rem;
        white-space: nowrap;
        border-radius: var(--radius-md) var(--radius-md) 0 0;
    }

    .custom-tabs .nav-link i {
        margin-right: 3px;
        font-size: 0.8rem;
    }

    /* ====== 筛选工具栏适配 ====== */
    .filter-toolbar {
        padding: 10px 12px;
        border-radius: var(--radius-md);
    }

    .filter-toolbar .row {
        gap: 6px;
        align-items: center;
    }

    .filter-toolbar .col-auto {
        flex: 0 1 auto;
        min-width: 0;
        max-width: none;
    }

    .filter-input,
    .filter-select,
    .filter-date {
        min-width: 100% !important;
        width: 100% !important;
        font-size: 0.88rem;
    }

    .filter-btn {
        font-size: 0.8rem;
        padding: 5px 9px;
        white-space: nowrap;
    }

    .filter-btn span {
        display: none;
    }

    .search-input-group {
        width: 100%;
    }

    .search-input-group input {
        width: 100%;
        font-size: 0.88rem;
    }

    /* 筛选栏中的按钮组 */
    .filter-toolbar .btn-group {
        flex-wrap: nowrap;
    }

    .filter-toolbar .btn-group .btn {
        font-size: 0.78rem;
        padding: 5px 8px;
    }

    .filter-toolbar .btn-group .btn span {
        display: none;
    }

    /* 右侧导出按钮组 - 与左侧按钮同行 */
    .filter-toolbar .col-auto.ms-auto {
        flex: 1 1 auto;
        display: flex;
        justify-content: flex-end;
        gap: 4px;
        margin-top: 0;
    }

    /* ====== 操作工具栏适配 ====== */
    .action-toolbar {
        padding: 8px 12px;
        flex-wrap: nowrap;
    }

    .action-toolbar > .d-flex {
        flex-wrap: nowrap;
        gap: 6px !important;
    }

    .action-toolbar .btn-group .btn span {
        font-size: 0;
    }

    .action-toolbar .btn-group .btn i {
        margin-right: 0;
    }

    .action-toolbar .text-muted {
        font-size: 0.8rem;
        white-space: nowrap;
    }

    /* 排序选择器 - 紧凑尺寸 */
    #sortSelect {
        width: 100px !important;
        font-size: 0.82rem;
        padding: 3px 6px;
    }

    .sort-order-select {
        min-width: 52px !important;
        max-width: 56px !important;
        font-size: 0.82rem;
        padding: 3px 4px;
    }

    /* 周期复盘按钮 */
    .action-toolbar .btn-outline-warning span {
        display: none;
    }

    /* ====== 统计卡片适配 ====== */
    .stat-card {
        padding: 14px 10px;
        border-radius: var(--radius-md);
    }

    .stat-number {
        font-size: 1.6rem;
    }

    .stat-label {
        font-size: 0.78rem;
    }

    /* ====== 卡片列表适配 ====== */
    .question-card {
        border-radius: var(--radius-md);
        min-height: auto;
    }

    .question-card-header {
        position: relative;
        top: auto;
        right: auto;
        padding: 0.5rem;
    }

    .question-actions {
        gap: 2px;
    }

    .btn-card-action {
        padding: 0.3rem 0.5rem;
        font-size: 0.75rem;
    }

    .question-title {
        font-size: 1rem;
        white-space: normal;
        overflow: visible;
        text-overflow: clip;
    }

    .question-content {
        padding: 1rem 1rem 0 1rem;
        max-height: 120px;
        font-size: 0.9rem;
    }

    .question-tags {
        padding: 0 1rem;
    }

    .question-footer-info {
        padding: 0.6rem 1rem;
        font-size: 0.8rem;
        flex-wrap: wrap;
        gap: 6px;
    }

    /* ====== 列表项适配（移动端改为垂直布局） ====== */
    .question-list-item,
    .vocabulary-list-item,
    .practice-list-item,
    .discrimination-list-item,
    .essay-list-item {
        padding: 12px;
        gap: 8px;
        border-radius: var(--radius-md);
        flex-direction: column;
        align-items: stretch;
    }

    .question-list-actions,
    .vocabulary-list-item .action-buttons,
    .practice-list-item .action-buttons,
    .discrimination-list-item .action-buttons,
    .essay-list-item .knowledge-list-actions {
        order: -1; /* 操作按钮移到最上面 */
        gap: 4px;
        display: flex;
        justify-content: flex-end;
        margin-bottom: 4px;
    }

    .question-list-preview {
        font-size: 0.9rem;
        white-space: normal;
        overflow: visible;
        text-overflow: clip;
        line-height: 1.5;
    }

    .question-list-tags {
        margin-top: 4px;
    }

    .question-list-meta {
        flex-wrap: wrap;
        gap: 8px;
        font-size: 0.78rem;
        flex-shrink: 0;
        margin-top: 6px;
        padding-top: 8px;
        border-top: 1px solid rgba(0,0,0,0.05);
    }

    /* ====== 元数据信息适配 ====== */
    .meta-info {
        font-size: 0.75rem !important;
        padding: 3px 6px;
        gap: 4px;
    }

    .meta-info i {
        font-size: 11px;
    }

    /* ====== 表格适配 ====== */
    .question-table {
        border-radius: var(--radius-md);
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .question-table table {
        min-width: 600px;
    }

    .question-table thead th {
        padding: 10px 8px;
        font-size: 0.82rem;
        white-space: nowrap;
    }

    .question-table tbody td {
        padding: 10px 8px;
        font-size: 0.85rem;
    }

    /* ====== 分页适配 ====== */
    .pagination-wrapper {
        padding: 12px;
        border-radius: var(--radius-md);
    }

    .pagination .page-link {
        padding: 6px 10px;
        font-size: 0.82rem;
        margin: 0 2px;
    }

    .pagination-wrapper .d-flex {
        flex-direction: column;
        gap: 10px;
    }

    .pagination-wrapper input[type="number"] {
        width: 60px !important;
    }

    /* ====== 浮动按钮适配 ====== */
    .floating-add-btn,
    .add-btn,
    .btn.add-btn,
    .btn.floating-add-btn {
        bottom: 20px;
        right: 20px;
        width: 52px;
        height: 52px;
        font-size: 1.3rem;
        box-shadow: 0 4px 16px rgba(249, 115, 22, 0.35);
    }

    .floating-buttons {
        bottom: 1rem;
        right: 1rem;
        gap: 0.75rem;
    }

    .floating-btn {
        width: 48px;
        height: 48px;
        font-size: 1rem;
    }

    /* ====== 模态框适配 ====== */
    .modal-dialog {
        margin: 10px;
        max-width: calc(100% - 20px);
    }

    .modal-content {
        border-radius: var(--radius-md);
    }

    .modal-header {
        padding: 14px 16px;
    }

    .modal-header .modal-title {
        font-size: 1rem;
    }

    .modal-body {
        padding: 16px;
        font-size: 0.9rem;
    }

    .modal-footer {
        padding: 12px 16px;
        flex-wrap: wrap;
        gap: 6px;
    }

    .modal-footer .btn {
        flex: 1 1 auto;
        min-width: 80px;
        font-size: 0.88rem;
    }

    /* ====== 空状态适配 ====== */
    .empty-state {
        padding: 50px 16px;
        min-height: 300px;
        border-radius: var(--radius-md);
    }

    .empty-state i {
        font-size: 2.5rem;
    }

    .empty-state h4 {
        font-size: 1.05rem;
    }

    .empty-state p {
        font-size: 0.88rem;
    }

    .empty-state .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    /* ====== 徽章/标签适配 ====== */
    .badge.tag-badge,
    .tag-badge,
    .tag-item {
        font-size: 0.68rem;
        padding: 0.18rem 0.45rem;
    }

    .status-badge {
        padding: 4px 10px;
        font-size: 0.78rem;
    }

    .subject-tag {
        font-size: 0.78rem;
        padding: 3px 8px;
    }

    /* ====== 操作按钮适配 ====== */
    .action-btn {
        padding: 3px 6px;
        font-size: 0.72rem !important;
    }

    .action-btn span {
        display: none;
    }

    .action-btn i {
        font-size: 12px;
    }

    /* ====== 下拉菜单适配 ====== */
    .dropdown-menu {
        min-width: 180px;
        font-size: 0.88rem;
        left: auto !important;
        right: 0 !important;
        transform: translateX(0) !important;
    }

    .dropdown-item {
        padding: 0.55rem 1rem;
        font-size: 0.86rem;
    }

    /* ====== 提示框适配 ====== */
    .alert-success,
    .alert-danger {
        padding: 0.75rem 1rem;
        font-size: 0.88rem;
        border-radius: var(--radius-md);
    }

    /* ====== 结果计数适配 ====== */
    .result-count {
        font-size: 0.85rem;
        padding: 6px 12px;
    }

    /* ====== 主内容区域 ====== */
    .main-wrapper {
        padding: 12px 10px;
        min-height: calc(100vh - 180px);
    }

    /* 详情页主内容区占满宽度（原分散在 discrimination/practice_detail/question_detail/knowledge_detail/vocabulary_detail 5 个详情页 CSS 中，已合并为公共样式） */
    .main-content {
        width: 100% !important;
        max-width: 100%;
        padding: 0 !important;
        margin: 0;
    }

    div.container-fluid {
        padding-top: 2px;
        padding-bottom: 2px;
    }
}

/* ---------- 手机 (<=576px) ---------- */
@media (max-width: 576px) {
    .main-wrapper {
        padding: 10px 8px;
    }

    .stat-number {
        font-size: 1.4rem;
    }

    .stat-label {
        font-size: 0.72rem;
    }

    .question-title {
        font-size: 0.95rem;
    }

    /* 导航栏进一步压缩 */
    .top-navbar {
        padding: 8px 10px;
    }

    .top-navbar .navbar-brand,
    .navbar .navbar-brand {
        font-size: 1rem;
    }

    .top-navbar .navbar-brand i,
    .navbar .navbar-brand i {
        font-size: 0.9rem;
        margin-right: 4px;
    }

    /* 标签页进一步压缩 */
    .custom-tabs .nav-link {
        padding: 10px 10px;
        font-size: 0.76rem;
    }

    .custom-tabs .nav-link i {
        font-size: 0.75rem;
        margin-right: 2px;
    }

    /* 隐藏标签页文字只显示图标（超小屏） */
    .custom-tabs .nav-link span {
        display: none;
    }

    .custom-tabs .nav-link {
        padding: 10px 8px;
    }

    /* 统计卡片 */
    .stat-card {
        padding: 12px 8px;
    }

    .stat-number {
        font-size: 1.3rem;
    }

    .stat-label {
        font-size: 0.68rem;
    }

    /* 卡片 */
    .question-card {
        border-radius: 8px;
        min-height: auto;
    }

    .question-content {
        padding: 0.8rem 0.8rem 0 0.8rem;
        max-height: 100px;
        font-size: 0.85rem;
    }

    .question-tags {
        padding: 0 0.8rem;
    }

    .question-footer-info {
        padding: 0.5rem 0.8rem;
        font-size: 0.76rem;
    }

    /* 列表项 */
    .question-list-item,
    .vocabulary-list-item,
    .practice-list-item,
    .discrimination-list-item,
    .essay-list-item {
        padding: 8px 10px;
        border-radius: 8px;
        gap: 6px;
    }

    .question-list-preview {
        font-size: 0.85rem;
    }

    /* 浮动按钮 */
    .floating-add-btn,
    .add-btn,
    .btn.add-btn,
    .btn.floating-add-btn {
        bottom: 16px;
        right: 16px;
        width: 48px;
        height: 48px;
        font-size: 1.2rem;
    }

    .floating-buttons {
        bottom: 0.75rem;
        right: 0.75rem;
    }

    .floating-btn {
        width: 44px;
        height: 44px;
        font-size: 0.95rem;
    }

    /* 分页 */
    .pagination .page-link {
        padding: 5px 8px;
        font-size: 0.78rem;
    }

    /* 模态框 */
    .modal-dialog {
        margin: 5px;
        max-width: calc(100% - 10px);
    }

    .modal-header {
        padding: 12px 14px;
    }

    .modal-body {
        padding: 14px;
    }

    .modal-footer {
        padding: 10px 14px;
    }

    /* 筛选栏 */
    .filter-toolbar {
        padding: 10px;
        border-radius: 8px;
    }

    .filter-input,
    .filter-select {
        font-size: 0.85rem;
        padding: 0.3rem 0.5rem;
    }

    /* 操作栏 */
    .action-toolbar {
        padding: 8px 10px;
    }

    /* 表单元素 */
    .form-control,
    .form-select {
        font-size: 0.9rem;
    }

    /* 空状态 */
    .empty-state {
        padding: 40px 12px;
        min-height: 250px;
    }

    .empty-state i {
        font-size: 2rem;
    }

    .empty-state h4 {
        font-size: 0.95rem;
    }

    .empty-state p {
        font-size: 0.82rem;
    }

    /* 主内容区 */
    .main-wrapper {
        padding: 8px 6px;
        min-height: calc(100vh - 160px);
    }
}

/* ---------- 超小屏 (<=380px) ---------- */
@media (max-width: 380px) {
    .stat-number {
        font-size: 1.15rem;
    }

    .stat-label {
        font-size: 0.62rem;
    }

    .custom-tabs .nav-link {
        padding: 8px 6px;
        font-size: 0.7rem;
    }

    .question-content {
        max-height: 80px;
        font-size: 0.82rem;
    }

    .floating-add-btn,
    .add-btn,
    .btn.add-btn,
    .btn.floating-add-btn {
        bottom: 12px;
        right: 12px;
        width: 44px;
        height: 44px;
        font-size: 1.1rem;
    }
}

/* ==================== 动画效果 ==================== */
.fade-in {
    animation: fadeIn 0.5s ease-in-out;
}

/* @keyframes fadeIn 统一在文末“动画关键帧”区定义，避免重复 */

/* ==================== 统一操作按钮样式（查看/编辑/删除） ==================== */
.action-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 4px 10px;
    font-size: 12px !important;
    font-weight: 500;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none !important;
    background: transparent;
    line-height: 1.5;
}

.action-btn i {
    font-size: 13px;
}

.action-btn:hover {
    transform: translateY(-1px);
    text-decoration: none !important;
}

.action-btn-view {
    color: #17a2b8 !important;
}

.action-btn-view:hover {
    color: #138496 !important;
    background: rgba(23, 162, 184, 0.08) !important;
}

.action-btn-review {
    color: #6f42c1 !important;
}

.action-btn-review:hover {
    color: #5a32a3 !important;
    background: rgba(111, 66, 193, 0.08) !important;
}

.action-btn-edit {
    color: #f97316 !important;
}

.action-btn-edit:hover {
    color: #ea580c !important;
    background: rgba(249, 115, 22, 0.08) !important;
}

.action-btn-delete {
    color: #dc3545 !important;
}

.action-btn-delete:hover {
    color: #c82333 !important;
    background: rgba(220, 53, 69, 0.08) !important;
}

.slide-in-right {
    animation: slideInRight 0.4s ease-out;
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

/* ==================== 工具提示和提示框 ==================== */
.tooltip-custom {
    position: relative;
}

.tooltip-custom::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 12px;
    background: rgba(0,0,0,0.85);
    color: white;
    font-size: 0.82rem;
    border-radius: var(--radius-sm);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    margin-bottom: 8px;
}

.tooltip-custom:hover::after {
    opacity: 1;
    visibility: visible;
}

/* ==================== 滚动条美化 ==================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #f97316, #ea580c);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #ea580c, #c2410c);
}

/* ==================== 打印样式 ==================== */
@media print {
    .top-navbar,
    .tab-navigation,
    .filter-toolbar,
    .action-toolbar,
    .floating-add-btn,
    .add-btn,
    .pagination-wrapper {
        display: none !important;
    }
    
    body {
        background: white;
    }
    
    .question-card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* ==================== 公共提示框样式 ==================== */
.alert-success {
    background: linear-gradient(135deg, #f97316, #ea580c);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    padding: 1rem 1.5rem;
    box-shadow: 0 4px 15px rgba(249, 115, 22, 0.3);
}

.alert-danger {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    padding: 1rem 1.5rem;
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

/* ==================== 橙色主题辅助类 ==================== */
.text-orange-500 { color: #f97316 !important; }
.bg-orange-500 { background-color: #f97316 !important; }
.border-orange-500 { border-color: #f97316 !important; }

/* ==================== Bootstrap 按钮颜色覆盖 ==================== */
.btn-primary {
    background-color: #f97316 !important;
    border-color: #f97316 !important;
}
.btn-primary:hover {
    background-color: #ea580c !important;
    border-color: #ea580c !important;
}
.btn-primary:focus {
    box-shadow: 0 0 0 0.2rem rgba(249, 115, 22, 0.5) !important;
}
.btn-primary:disabled {
    background-color: #fdba74 !important;
    border-color: #fdba74 !important;
}
.btn-outline-primary {
    color: #f97316 !important;
    border-color: #f97316 !important;
}
.btn-outline-primary:hover {
    background-color: #f97316 !important;
    border-color: #f97316 !important;
    color: white !important;
}
.btn-outline-primary:focus {
    box-shadow: 0 0 0 0.2rem rgba(249, 115, 22, 0.5) !important;
}

/* ==================== 表单元素公共样式 ==================== */
.form-control,
.form-select {
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    padding: 0.4rem 0.8rem;
    transition: all 0.3s ease;
    font-size: 0.95rem;
    background-color: #F5F4F0;
}

.form-select {
    padding: 0.35rem 2rem 0.35rem 0.8rem;
}

.form-select-sm {
    padding: 0.25rem 1.8rem 0.25rem 0.6rem;
    font-size: 0.875rem;
}

/* 排序选择框 - 确保中文文字完整显示 */
.sort-order-select {
    min-width: 65px;
    width: auto;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(249, 115, 22, 0.15);
    outline: none;
}

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

/* ==================== 卡片样式 ==================== */
.card {
    background-color: #F5F4F0;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.card-body {
    background-color: #F5F4F0;
}

.form-check-input:checked {
    background-color: #f97316;
    border-color: #f97316;
}

/* ==================== 按钮公共样式 ==================== */
.btn {
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    color: white;
}

.btn-outline-primary {
    color: var(--primary-color);
    border-color: var(--primary-color);
}

/* ==================== 下拉菜单样式 ==================== */
.dropdown-menu {
    background-color: #F5F4F0;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    padding: 0.5rem 0;
    min-width: 220px;
    animation: fadeIn 0.2s ease;
    z-index: 1050;
}

/* @keyframes fadeIn 统一在文末“动画关键帧”区定义，避免重复 */

.dropdown-header {
    padding: 0.75rem 1.2rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
    background-color: transparent;
}

.dropdown-divider {
    border-top-color: var(--border-color);
    margin: 0.5rem 0;
}

.dropdown-item {
    padding: 0.65rem 1.2rem;
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
}

.dropdown-item:hover {
    background-color: rgba(249, 115, 22, 0.08);
    color: var(--primary-color);
}

.dropdown-item i {
    width: 20px;
    text-align: center;
    margin-right: 0.5rem;
}

.dropdown-item.text-danger {
    color: var(--danger-color);
}

.dropdown-item.text-danger:hover {
    background-color: rgba(220, 53, 69, 0.08);
    color: var(--danger-color);
}

.dropdown-header {
    padding: 0.6rem 1.2rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 600;
}

.dropdown-divider {
    border-top-color: var(--border-color);
    margin: 0.3rem 0;
}

.dropdown-item.text-danger {
    color: var(--danger-color);
}

.dropdown-item.text-danger:hover {
    background-color: rgba(220, 53, 69, 0.1);
    color: var(--danger-color);
}

.btn-outline-primary:hover {
    color: white;
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* ==================== 模态框公共样式 ==================== */
.modal-content {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.modal-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.modal-footer {
    border-top: 1px solid var(--border-color);
    background: var(--bg-light);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* ==================== 动画关键帧 ==================== */
@keyframes slideIn {
    from { opacity: 0; transform: translateX(-20px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes slideOut {
    from { opacity: 1; transform: translateX(0); }
    to { opacity: 0; transform: translateX(20px); }
}

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

/* ==================== 富文本编辑器容器（公共） ====================
   原 knowledge/vocabulary/question/discrimination/practice_edit 等 5 个编辑页
   内嵌 <style> 中重复定义，已合并为公共样式。
   含 resize: vertical / overflow: auto，允许垂直拖动调整大小。
   需要不同表现（如 essay_edit 的强制全宽、review 的 flex:1、review_types 禁用 resize）
   的页面请使用各自重命名后的专属类名，勿直接覆盖此类。 */
.editor-container {
    border: 1px solid #dee2e6;
    border-radius: 8px;
    overflow: hidden;
    background: #fff;
}

.editor-iframe {
    width: 100%;
    height: 1000px;
    min-height: 600px;
    border: none;
    display: block;
    background: #fff;
    resize: vertical;  /* 允许垂直拖动调整大小 */
    overflow: auto;     /* 必须配合 resize 使用 */
}

/* ==================== 解释块样式（eq-explain）— 富文本渲染页面通用 ====================
   富文本编辑器"解释"插件（table-editor-zh.html 工具栏 📖 解释）插入的可收缩内容块：
   上方标题栏（点击可收缩/展开），下方具体内容。
   基于 <details>/<summary> 原生可收缩，显示页面无需额外 JS。
   所有富文本渲染页面（详情页/列表卡片等）统一生效。 */
details.eq-explain {
    margin: 12px 0;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    background: #fff;
    overflow: hidden;
    box-sizing: border-box;
}

details.eq-explain > summary {
    cursor: pointer;
    padding: 10px 14px;
    background: linear-gradient(135deg, #fff7ed, #ffedd5);
    font-weight: 700;
    font-size: 17px;
    line-height: 1.5;
    color: #9a3412;
    border-bottom: 1px solid #e5e7eb;
    user-select: none;
    list-style-position: inside;
}

details.eq-explain > summary:hover {
    background: linear-gradient(135deg, #ffedd5, #fed7aa);
}

details.eq-explain[open] > summary {
    border-bottom: 1px solid #e5e7eb;
}

details.eq-explain > .eq-explain-body {
    padding: 12px 16px;
    font-size: 16px;
    line-height: 1.7;
}

/* 编辑器注入的标题工具按钮（折叠/删除）与右下角拖拽手柄仅在编辑器内显示，
   渲染页面统一隐藏，避免把编辑器交互元素带入展示内容 */
details.eq-explain .eq-explain-tools,
details.eq-explain .eq-explain-resize-handle {
    display: none !important;
}

/* 解释块内图片/表格不超出容器 */
details.eq-explain img {
    max-width: 100%;
    height: auto;
}

details.eq-explain table {
    max-width: 100%;
}

/* 预定义字体（让 iframe 共享） */
@font-face {
    font-family: '霞鹭文楷';
    src: url('/static/summernote-ext-table-master/script/summernote/font/LXGWWenKaiMonoGBScreen.ttf') format('truetype');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: '苹方-简';
    src: url('/static/summernote-ext-table-master/script/summernote/font/苹方-简 常规体.TTF') format('truetype');
    font-weight: normal;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: '苹方-简';
    src: url('/static/summernote-ext-table-master/script/summernote/font/苹方-简 中粗体.TTF') format('truetype');
    font-weight: bold;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: '苹方-简';
    src: url('/static/summernote-ext-table-master/script/summernote/font/苹方-简 细体.TTF') format('truetype');
    font-weight: 300;
    font-style: normal;
    font-display: swap;
}

/* 富文本公式 - 全局样式（所有页面生效，最高优先级） */
.note-latex {
    display: none !important;
    visibility: hidden !important;
    height: 0 !important;
    overflow: hidden !important;
    position: absolute !important;
    left: -9999px !important;
}

.katex-mathml {
    display: none !important;
}

.note-math {
    display: inline-block !important;
    vertical-align: middle !important;
    font-size: 16px !important;
    font-family: KaTeX_Math, 'Times New Roman', serif !important;
}

.note-math .katex {
    font-size: 1em !important;
}

/* ========== H1-H6 标题样式（霞鹭文楷 + 荧光笔效果）- 所有详情页通用 ========== */
.section-content h1,
.section-content h2,
.section-content h3,
.section-content h4,
.section-content h5,
.section-content h6,
.content-section h1,
.content-section h2,
.content-section h3,
.content-section h4,
.content-section h5,
.content-section h6 {
    font-family: '霞鹭文楷', '苹方-简', sans-serif !important;
    font-weight: 700 !important;
    line-height: 1.5 !important;
    margin-top: 0.8em !important;
    margin-bottom: 0.5em !important;
    padding: 0.15em 0.3em !important;
    border-radius: 3px !important;
    word-break: break-word !important;
}

/* H1 - 最大标题，深橙荧光笔 */
.section-content h1, .content-section h1 {
    font-size: 28px !important;
    color: #9a3412 !important;
    background: linear-gradient(transparent 60%, rgba(254, 215, 170, 0.55) 60%) !important;  /* 橙色荧光笔 */
}

/* H2 - 二级标题，橙色荧光笔 */
.section-content h2, .content-section h2 {
    font-size: 24px !important;
    color: #c2410c !important;
    background: linear-gradient(transparent 60%, rgba(254, 243, 199, 0.50) 60%) !important;  /* 浅橙荧光笔 */
}

/* H3 - 三级标题，淡黄荧光笔 */
.section-content h3, .content-section h3 {
    font-size: 21px !important;
    color: #b45309 !important;
    background: linear-gradient(transparent 60%, rgba(254, 240, 138, 0.45) 60%) !important;  /* 黄色荧光笔 */
}

/* H4 - 四级标题，淡绿荧光笔 */
.section-content h4, .content-section h4 {
    font-size: 19px !important;
    color: #4d7c0f !important;
    background: linear-gradient(transparent 60%, rgba(220, 252, 231, 0.40) 60%) !important;  /* 绿色荧光笔 */
}

/* H5 - 五级标题，淡蓝荧光笔 */
.section-content h5, .content-section h5 {
    font-size: 17px !important;
    color: #0369a1 !important;
    background: linear-gradient(transparent 60%, rgba(224, 242, 254, 0.35) 60%) !important;  /* 蓝色荧光笔 */
}

/* H6 - 六级标题，淡紫荧光笔 */
.section-content h6, .content-section h6 {
    font-size: 16px !important;
    color: #7e22ce !important;
    background: linear-gradient(transparent 60%, rgba(245, 243, 255, 0.35) 60%) !important;  /* 紫色荧光笔 */
}

/* ========== 兼容：样式化的大字文本（非标准h标签，如用加粗+大字号模拟的标题）========== */
.section-content p[style*="font-size"],
.section-content div[style*="font-size"],
.section-content span[style*="font-size"],
.content-section p[style*="font-size"],
.content-section div[style*="font-size"],
.content-section span[style*="font-size"] {
    font-family: '霞鹭文楷', '苹方-简', sans-serif !important;
}

/* ========== 下划线统一渲染（所有详情/列表显示页通用） ==========
   原理：浏览器默认下划线的粗细/位置由字体度量(font metrics)决定，
   富文本中混排字体(霞鹭文楷/苹方/Arial/Times/KaTeX)和不同字号/粗细，
   会导致同一类型下划线粗细、与文字距离不一致。
   此处统一为固定值（与编辑器 table-editor-zh.html 中的默认值保持一致）；
   带 inline 自定义 text-decoration-thickness / text-underline-offset 的下划线不受影响（inline 优先级更高）。 */
.section-content u,
.content-section u,
.section-content [style*="text-decoration: underline"],
.content-section [style*="text-decoration: underline"],
.section-content [style*="text-decoration:underline"],
.content-section [style*="text-decoration:underline"] {
    text-decoration-thickness: 2px;
    text-underline-offset: 3px;
    text-decoration-skip-ink: none;
}

/* ==================== 富文本渲染：统一霞鹭文楷字体 + 一致字号 ====================
 * 目标：让所有"详情页 / 知识详情块"的富文本与编辑器 table-editor-zh.html
 * 中 .note-editable 的默认视觉严格一致：
 *   - 字体：霞鹭文楷（带苹方等回退）
 *   - 正文基准字号：20px（编辑器 .note-editable 默认 font-size: 20px）
 *   - 行高：1.8
 * 列表卡片上的"预览块"仍使用 15px 的小版本，但保持霞鹭文楷。
 * 策略：只设置容器/普通块级元素的默认字号与字体；
 * 用户在编辑器里显式选的 inline font-size / font-family 会覆盖默认值，完全保留。 */

/* —— 第一组：详情级富文本容器（对标编辑器 20px 默认正文）—— */
.section-content,
.content-section,
.explanation-content,
.examples-content,
.discrimination-content,
.content-text,
.content-full-display .card-body {
    font-family: '霞鹭文楷', 'LXGW WenKai', '苹方-简',
        -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB',
        'Microsoft YaHei', '微软雅黑', sans-serif !important;
    font-size: 20px !important;
    line-height: 1.8;
    color: var(--text-primary);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* —— 第二组：申论/做题/套题 卡片里的富文本（card-body 富文本区域）——
 * 注：这些容器承载的是题目描述/分析等富文本块，按编辑器默认 20px 对齐。 */
.essay-card .card-body,
.practice-card .card-body,
.exam-record-card .card-body {
    font-family: '霞鹭文楷', 'LXGW WenKai', '苹方-简',
        -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB',
        'Microsoft YaHei', '微软雅黑', sans-serif !important;
    font-size: 20px;
    line-height: 1.8;
    color: var(--text-primary);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* —— 第三组：列表卡片预览（只显示 1~3 行，略缩到 15px）—— */
.question-list-preview,
.vocabulary-card-content,
.discrimination-card-content {
    font-family: '霞鹭文楷', 'LXGW WenKai', '苹方-简',
        -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB',
        'Microsoft YaHei', '微软雅黑', sans-serif !important;
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-primary);
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* 容器内通用块级元素：统一继承霞鹭文楷默认字体，段落间距对齐编辑器默认 */
.section-content p,
.content-section p,
.explanation-content p,
.examples-content p,
.discrimination-content p,
.content-text p,
.content-full-display .card-body p,
.vocabulary-card-content p,
.discrimination-card-content p,
.question-list-preview p,
.essay-card .card-body p,
.practice-card .card-body p,
.exam-record-card .card-body p,
.section-content li,
.content-section li,
.explanation-content li,
.examples-content li,
.discrimination-content li,
.content-text li,
.content-full-display .card-body li,
.vocabulary-card-content li,
.discrimination-card-content li,
.essay-card .card-body li,
.practice-card .card-body li,
.exam-record-card .card-body li,
.section-content blockquote,
.content-section blockquote,
.explanation-content blockquote,
.examples-content blockquote,
.discrimination-content blockquote,
.content-text blockquote,
.content-full-display .card-body blockquote,
.vocabulary-card-content blockquote,
.discrimination-card-content blockquote,
.essay-card .card-body blockquote,
.practice-card .card-body blockquote,
.exam-record-card .card-body blockquote,
.section-content td,
.content-section td,
.explanation-content td,
.examples-content td,
.discrimination-content td,
.content-text td,
.content-full-display .card-body td,
.vocabulary-card-content td,
.discrimination-card-content td,
.essay-card .card-body td,
.practice-card .card-body td,
.exam-record-card .card-body td,
.section-content th,
.content-section th,
.explanation-content th,
.examples-content th,
.discrimination-content th,
.content-text th,
.content-full-display .card-body th,
.vocabulary-card-content th,
.discrimination-card-content th,
.essay-card .card-body th,
.practice-card .card-body th,
.exam-record-card .card-body th {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
}

.section-content p,
.content-section p,
.explanation-content p,
.examples-content p,
.discrimination-content p,
.content-text p,
.content-full-display .card-body p,
.vocabulary-card-content p,
.discrimination-card-content p,
.essay-card .card-body p,
.practice-card .card-body p,
.exam-record-card .card-body p {
    margin-bottom: 0.85em;
}

/* —— 第四组：详情容器内的 H1-H6 尺寸（镜像编辑器 28/24/21/19/17/16）—— */
.section-content h1,
.content-section h1,
.explanation-content h1,
.examples-content h1,
.discrimination-content h1,
.content-text h1,
.content-full-display .card-body h1,
.essay-card .card-body h1,
.practice-card .card-body h1,
.exam-record-card .card-body h1 {
    font-size: 28px !important;
}
.section-content h2,
.content-section h2,
.explanation-content h2,
.examples-content h2,
.discrimination-content h2,
.content-text h2,
.content-full-display .card-body h2,
.essay-card .card-body h2,
.practice-card .card-body h2,
.exam-record-card .card-body h2 {
    font-size: 24px !important;
}
.section-content h3,
.content-section h3,
.explanation-content h3,
.examples-content h3,
.discrimination-content h3,
.content-text h3,
.content-full-display .card-body h3,
.essay-card .card-body h3,
.practice-card .card-body h3,
.exam-record-card .card-body h3 {
    font-size: 21px !important;
}
.section-content h4,
.content-section h4,
.explanation-content h4,
.examples-content h4,
.discrimination-content h4,
.content-text h4,
.content-full-display .card-body h4,
.essay-card .card-body h4,
.practice-card .card-body h4,
.exam-record-card .card-body h4 {
    font-size: 19px !important;
}
.section-content h5,
.content-section h5,
.explanation-content h5,
.examples-content h5,
.discrimination-content h5,
.content-text h5,
.content-full-display .card-body h5,
.essay-card .card-body h5,
.practice-card .card-body h5,
.exam-record-card .card-body h5 {
    font-size: 17px !important;
}
.section-content h6,
.content-section h6,
.explanation-content h6,
.examples-content h6,
.discrimination-content h6,
.content-text h6,
.content-full-display .card-body h6,
.essay-card .card-body h6,
.practice-card .card-body h6,
.exam-record-card .card-body h6 {
    font-size: 16px !important;
}

/* 列表卡片预览（错题 / 词汇 / 辨析）字号对齐编辑器默认 20px
 * 与详情级正文保持一致，保证"卡片看一眼"和"进编辑器看/进详情看"的字体大小无落差
 * 加 !important 覆盖 vocabulary.css / discrimination.css 中遗留的 0.95rem/0.875rem 局部字号 */
.question-list-preview,
.vocabulary-card-content,
.discrimination-card-content {
    font-size: 20px !important;
    line-height: 1.7;
}

/* 让带内联 font-size / font-family 的 span 仍继承霞鹭文楷，但保留 inline 指定的字号
 * （用户在编辑器里显式选了 20/18/24 等，详情页要与之完全一致） */
.section-content span[style*="font-size"],
.content-section span[style*="font-size"],
.section-content span[style*="font-family"],
.content-section span[style*="font-family"],
.explanation-content span[style*="font-size"],
.examples-content span[style*="font-size"],
.discrimination-content span[style*="font-size"],
.content-text span[style*="font-size"],
.content-full-display .card-body span[style*="font-size"],
.vocabulary-card-content span[style*="font-size"],
.discrimination-card-content span[style*="font-size"],
.essay-card .card-body span[style*="font-size"],
.practice-card .card-body span[style*="font-size"],
.exam-record-card .card-body span[style*="font-size"] {
    font-family: '霞鹭文楷', 'LXGW WenKai', '苹方-简',
        -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB',
        'Microsoft YaHei', '微软雅黑', sans-serif !important;
}

/* ==================== 公共页脚样式（原 _footer.html 内嵌 <style>） ==================== */
.app-footer {
    background-color: #F5F4F0;
    border-top: 1px solid #e9ecef;
    padding: 15px 0;
    margin-top: auto;
    width: 100%;
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: #6c757d;
}

.footer-text {
    white-space: nowrap;
}

.footer-divider {
    color: #dee2e6;
}