/**
 * EduManage - Pages CSS
 * 页面特定样式文件 - 包含各页面的专属样式
 * 
 * 文件结构：
 * 1. Login Page (登录页面)
 * 2. Dashboard (仪表盘页面)
 * 3. Management Pages (管理页面通用)
 * 4. Homework Answer (答题页面)
 * 5. Submission Preview (提交预览页面)
 */

/* ============================================
   1. Login Page (登录页面)
   ============================================ */

/* 登录区域容器 */
.login-section {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    background-color: #ffffff;
}

/* 登录卡片容器 */
.login-container {
    background-color: #ffffff;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    width: 100%;
    max-width: 380px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.login-container:hover {
    box-shadow: var(--shadow-lg);
}

/* 登录头部 */
.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-title {
    font-family: var(--font-family-primary);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.login-subtitle {
    color: var(--color-secondary);
    font-size: 0.9rem;
}

/* 登录表单 */
.login-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

/* 登录按钮 - 自定义样式（与通用btn区分） */
.login-button {
    width: 100%;
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
    font-weight: 500;
    font-family: var(--font-family-primary);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-sm);
    background-color: var(--color-primary);
    color: #ffffff;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.login-button:hover {
    background-color: transparent;
    color: var(--color-primary);
}

.login-button.btn-loading {
    position: relative;
    overflow: hidden;
    pointer-events: none;
    opacity: 0.7;
}

.login-button.btn-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-right-color: currentColor;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.login-button.btn-loading span {
    visibility: hidden;
}

/* 错误提示 */
.login-error-message {
    color: var(--color-error);
    font-size: 0.8rem;
    margin-top: var(--spacing-xs);
}

/* 输入框错误状态 */
.login-form .form-input.has-error {
    border-color: var(--color-error);
}

/* 登录页面响应式 */
@media (max-width: 768px) {
    .login-container {
        padding: var(--spacing-lg);
    }
    
    .login-title {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .login-container {
        padding: var(--spacing-md);
    }
    
    .login-section {
        padding: var(--spacing-md);
    }
}

/* ============================================
   2. Dashboard (仪表盘页面)
   ============================================ */

/* 仪表盘容器 */
.dashboard {
    background-color: #ffffff;
    min-height: 100vh;
    padding: var(--spacing-xl) 0;
}

/* 管理员仪表盘 */
.admin-dashboard {
    padding: var(--spacing-lg) 0;
}

.admin-dashboard .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.admin-dashboard-title {
    text-align: center;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xl);
    font-family: var(--font-family-primary);
    font-size: 1.5rem;
    font-weight: 700;
}

.admin-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.admin-stats .stat-card {
    background-color: #ffffff;
    padding: var(--spacing-xl);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: all var(--transition-normal);
    display: block;
    text-decoration: none;
    color: inherit;
    border: 1px solid var(--color-border);
}

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

.admin-stats .stat-card h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
    font-family: var(--font-family-primary);
    font-size: 1.1rem;
}

.admin-stats .stat-card p {
    color: var(--color-secondary);
    font-size: 0.9rem;
    margin-bottom: 0;
}

.dashboard-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 仪表盘头部 */
.dashboard-header {
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.dashboard-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.dashboard-subtitle {
    color: var(--color-secondary);
    font-size: 1rem;
}

/* 仪表盘统计卡片 */
.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background-color: #ffffff;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    transition: box-shadow var(--transition-normal);
}

.stat-card:hover {
    box-shadow: var(--shadow-md);
}

.stat-card-title {
    font-size: 0.85rem;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.stat-card-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
}

/* 仪表盘区块 */
.dashboard-section {
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

/* 作业卡片列表 */
.homework-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.homework-card {
    background-color: #ffffff;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-normal);
}

.homework-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.homework-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.homework-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.homework-meta {
    font-size: 0.9rem;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-xs);
}

.homework-deadline {
    font-size: 0.9rem;
    color: #ff6b6b;
    font-weight: 500;
}

.homework-description {
    color: var(--color-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-lg);
}

.homework-actions {
    margin-top: var(--spacing-sm);
}

.btn-homework {
    flex: 1;
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.85rem;
    text-align: center;
}

/* 状态徽章 - 复用 core.css 的 .badge 类 */

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 0;
    color: var(--color-secondary);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.empty-state-desc {
    font-size: 0.9rem;
}

/* 仪表盘响应式 */
@media (max-width: 768px) {
    .dashboard-stats {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
    
    .homework-list {
        grid-template-columns: 1fr;
    }

    .homework-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .homework-deadline {
        margin-top: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    .dashboard {
        padding: var(--spacing-lg) 0;
    }

    .dashboard-title {
        font-size: 1.5rem;
    }

    .homework-card {
        padding: var(--spacing-md);
    }
}

/* ============================================
   3. Management Pages (管理页面通用)
   ============================================ */

/* 管理页面容器 - 统一样式 */
.management-page,
.class-management,
.question-management,
.testpaper-management,
.homework-management,
.user-management {
    min-height: 60vh;
    padding: var(--spacing-xl) 0;
}

.management-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 页面头部 */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.page-header h1 {
    color: var(--color-primary);
    margin: 0;
    font-family: var(--font-family-primary);
}

/* 搜索筛选栏 */
.search-bar {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    align-items: center;
}

.search-wrapper {
    display: flex;
    gap: var(--spacing-sm);
    flex: 1;
    min-width: 250px;
    max-width: 400px;
}

.filter-row {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.filter-label {
    font-size: 0.85rem;
    color: var(--color-secondary);
    font-weight: 500;
}

/* 模态框内表单区域 */
.form-section {
    background-color: #f8f9fa;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.form-section h4 {
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

/* 模态框内列表管理区域 */
.list-management {
    margin-top: var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.list-header {
    background-color: #f8f9fa;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.list-header h4 {
    margin: 0;
    color: var(--color-primary);
    font-size: 1rem;
}

.list-table-container {
    max-height: 260px;
    min-height: 260px;
    overflow-y: auto;
}

.list-table-container .table {
    margin-bottom: 0;
}

/* 加载指示器 */
.loading-indicator {
    text-align: center;
    padding: var(--spacing-lg) 0;
    color: var(--color-secondary);
    font-size: 0.875rem;
}

/* 小输入框 */
.form-input-sm {
    width: 60px;
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}


/* 搜索框容器样式 */
.search-box {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* 选中行样式 */
.selected-row {
    background-color: rgba(0, 0, 0, 0.05) !important;
}

.selected-row:hover {
    background-color: rgba(0, 0, 0, 0.08) !important;
}

/* 响应式布局 */
@media (max-width: 768px) {
    .grid-cols-2,
    .grid-cols-3 {
        grid-template-columns: 1fr;
    }
    
    .col-span-2,
    .col-span-3 {
        grid-column: span 1;
    }
    
    .list-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .search-box .search-input {
        width: 100%;
    }
    
    .filter-box {
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .search-bar {
        flex-direction: column;
        align-items: stretch;
    }
}

/* 信息区域通用样式 */
.class-info-section,
.testpaper-info-section {
    background-color: #f8f9fa;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.homework-info-section {
    background-color: #f8f9fa;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    margin-bottom: var(--spacing-lg);
}

.class-info-section h4,
.testpaper-info-section h4,
.homework-info-section h4 {
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

/* 简化的列表管理样式 - 通用 */
.student-management-simple,
.class-management-simple,
.testpaper-management-simple,
.question-management-simple,
.question-management-container-simple {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-top: var(--spacing-lg);
}

/* 列表头部 - 通用 */
.student-management-header,
.class-management-header,
.testpaper-management-header,
.question-management-header,
.list-header-single {
    background-color: #f8f9fa;
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.student-management-header h4,
.class-management-header h4,
.testpaper-management-header h4,
.question-management-header h4,
.list-header-single h4 {
    margin: 0;
    color: var(--color-primary);
    font-size: 1rem;
}

/* 筛选框 - 通用 */
.filter-box-single,
.filter-box {
    display: flex;
    gap: var(--spacing-sm);
}

/* 列表表格容器 - 通用 */
.student-table-container-simple,
.class-table-container-simple,
.testpaper-table-container-simple,
.question-table-container-simple {
    max-height: 260px;
    min-height: 260px;
    overflow-y: auto;
    position: relative;
}

.student-table-container-simple .table,
.class-table-container-simple .table,
.testpaper-table-container-simple .table,
.question-table-container-simple .table {
    margin-bottom: 0;
}

.student-table-container-simple .table th:first-child,
.student-table-container-simple .table td:first-child,
.class-table-container-simple .table th:first-child,
.class-table-container-simple .table td:first-child {
    width: 40px;
    text-align: center;
}

/* 分数显示 */
.total-score-display {
    display: flex;
    gap: var(--spacing-lg);
    font-size: 0.875rem;
    color: #333;
    margin-left: auto;
}

.total-score-display strong {
    color: var(--color-primary);
}

/* ============================================
   3.2 题目管理页面特定样式
   ============================================ */

/* 添加题目操作区域 */
.add-question-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.add-question-actions .btn {
    height: 38px;
    white-space: nowrap;
}

.add-question-actions .form-select {
    height: 38px;
}

/* 富文本编辑器样式 */
.editor-wrapper {
    border: 1px solid #ddd;
    border-radius: var(--radius-sm);
    margin-top: var(--spacing-sm);
    overflow: hidden;
}

.editor-toolbar {
    border-bottom: 1px solid #ddd;
    background-color: #f9f9f9;
}

.editor-container {
    height: 300px;
}

.editor-wrapper:focus-within {
    border-color: var(--color-primary);
    outline: none;
}

/* ============================================
   3.4 作业管理页面特定样式
   ============================================ */

/* 作业提交记录页面 */
.homework-submission-records {
    min-height: 60vh;
    padding: var(--spacing-xl) 0;
}

.homework-submission-records .page-title {
    color: var(--color-primary);
    margin: 0 0 var(--spacing-lg) 0;
    font-family: var(--font-family-primary);
    font-size: 1.8rem;
}

.homework-info {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.homework-info h2 {
    color: #343a40;
    margin: 0 0 var(--spacing-sm) 0;
    font-size: 1.4rem;
    font-family: var(--font-family-primary);
}

.info-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
}

.info-item {
    font-size: 1rem;
    color: #495057;
}

.info-item strong {
    color: #212529;
}

/* 作业提交记录响应式 */
@media (max-width: 768px) {
    .homework-submission-records .page-title {
        font-size: 1.5rem;
    }

    .info-row {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .data-table .table th,
    .data-table .table td {
        padding: var(--spacing-sm) calc(var(--spacing-sm) + 2px);
        font-size: 0.85rem;
    }
}

/* ============================================
   4. Homework Answer (答题页面)
   ============================================ */

/* 答题页面容器 */
.answer-page {
    background-color: #ffffff;
    min-height: 100vh;
    padding: var(--spacing-xl) 0;
    position: relative;
}

.answer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    position: relative;
}

/* 答题头部 */
.answer-header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.answer-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-family-primary);
}

.answer-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    font-size: 0.9rem;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-lg);
}

/* 答题区域 */
.answer-section {
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

/* 题目项 - 复用 components.css 的 .question-item 样式 */

.answer-page .question-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.answer-page .question-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

/* 模态框内容样式 */
.modal-content {
    padding: var(--spacing-sm) 0;
}

.modal-message {
    margin-bottom: var(--spacing-lg);
    line-height: 1.5;
}

.unanswered-warning {
    background-color: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.unanswered-warning h4 {
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
    color: #856404;
    font-size: 1rem;
}

.unanswered-numbers {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.unanswered-number {
    color: #dc3545;
    font-weight: normal;
    font-size: 1rem;
}

/* 题目序号和选项样式 - 复用 components.css */

.option-radio {
    margin-right: var(--spacing-md);
    margin-top: 2px;
}

/* 问答题答题区 */
.essay-answer {
    margin-bottom: var(--spacing-lg);
}

.essay-answer textarea {
    width: 100%;
    min-height: 150px;
    padding: var(--spacing-md);
    border: 1px solid #ddd;
    border-radius: var(--radius-sm);
    resize: vertical;
    font-family: var(--font-family-primary);
    font-size: 0.9rem;
}

/* 答题选项交互样式 */
.answer-option {
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
}

.answer-option:hover {
    background-color: #f5f5f5;
    border-color: var(--color-border);
}

.answer-option.selected {
    background-color: #e3f2fd;
    border-color: #1976d2;
}

.answer-option .option-radio {
    cursor: pointer;
}

/* 答题状态样式 */
.answer-status {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
}

.answer-status.answered {
    background-color: #e8f5e9;
    color: #388e3c;
}

/* 提交按钮区域 */
.answer-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background-color: #ffffff;
}

/* 答题页面响应式 */
@media (max-width: 768px) {
    .answer-page {
        padding: var(--spacing-lg) 0;
    }

    .answer-title {
        font-size: 1.5rem;
    }

    .answer-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .question-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-sm);
    }

    .question-info {
        flex-wrap: wrap;
    }

    .answer-actions {
        flex-direction: column;
        align-items: center;
    }

    .answer-actions .btn {
        width: 100%;
        max-width: 200px;
        text-align: center;
    }
}

/* 作业信息卡片 */
.homework-info-card {
    background-color: #ffffff;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    margin-bottom: var(--spacing-lg);
}

.homework-info-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.homework-info-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
}

.homework-info-meta {
    display: flex;
    gap: var(--spacing-lg);
    font-size: 0.9rem;
    color: var(--color-secondary);
}

.homework-info-deadline {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/* 题目列表 */
.questions-container {
    background-color: #ffffff;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    overflow: hidden;
}

/* 选项列表 */
.options-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

@media (max-width: 640px) {
    .options-list {
        grid-template-columns: 1fr;
    }
}

/* 可点击行样式 */
.clickable-row {
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.clickable-row:hover {
    background-color: #f5f5f5;
}

/* 问答题输入区域 */
.essay-answer-area {
    margin-top: var(--spacing-md);
}

.essay-textarea {
    width: 100%;
    min-height: 150px;
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-family-primary);
    font-size: 0.95rem;
    resize: vertical;
    transition: border-color var(--transition-fast);
}

.essay-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* 进度信息 */
.progress-info {
    font-size: 0.9rem;
    color: var(--color-secondary);
}

.progress-bar {
    width: 200px;
    height: 8px;
    background-color: var(--color-light);
    border-radius: 4px;
    overflow: hidden;
    margin-top: var(--spacing-xs);
}

.progress-fill {
    height: 100%;
    background-color: var(--color-primary);
    transition: width var(--transition-normal);
}

/* ============================================
   4.1 答题页面特有样式 (基于 submission-preview)
   ============================================ */

/* 答题页面的选项交互样式 */
.submission-preview .answer-option {
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
}

.submission-preview .answer-option:hover {
    background-color: #f5f5f5;
    border-color: var(--color-border);
}

.submission-preview .answer-option.selected {
    background-color: #e3f2fd;
    border-color: #1976d2;
}

.submission-preview .option-radio {
    margin-right: var(--spacing-md);
    margin-top: 2px;
    cursor: pointer;
}

/* 答题状态样式 */
.submission-preview .answer-status {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
}

.submission-preview .answer-status.answered {
    background-color: #e8f5e9;
    color: #388e3c;
}

/* 问答题答题区 */
.submission-preview .essay-answer {
    margin-bottom: var(--spacing-lg);
}

.submission-preview .essay-answer textarea {
    width: 100%;
    min-height: 150px;
    padding: var(--spacing-md);
    border: 1px solid #ddd;
    border-radius: var(--radius-sm);
    resize: vertical;
    font-family: var(--font-family-primary);
    font-size: 0.9rem;
}

/* 问答题输入区域 */
.submission-preview .essay-textarea {
    width: 100%;
    min-height: 150px;
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-family-primary);
    font-size: 0.95rem;
    resize: vertical;
    transition: border-color var(--transition-fast);
}

.submission-preview .essay-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* 提交按钮区域 */
.submission-preview .answer-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background-color: #ffffff;
}

/* 加载遮罩 */
.submission-preview .loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.submission-preview .loading-overlay .loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

.submission-preview .loading-overlay .loading-text {
    font-size: 1rem;
    color: var(--color-secondary);
}

/* 答题页面加载遮罩 */
.answer-page .loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.9);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.answer-page .loading-overlay .loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--spacing-md);
}

.answer-page .loading-overlay .loading-text {
    font-size: 1rem;
    color: var(--color-secondary);
}

/* 未作答题目序号列表 */
.unanswered-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 10px 0;
}

.unanswered-number {
    color: #dc3545;
    font-weight: normal;
    font-size: 1rem;
}

/* 答题页面响应式 */
@media (max-width: 768px) {
    .submission-preview .answer-actions {
        flex-direction: column;
        align-items: center;
    }

    .submission-preview .answer-actions .btn {
        width: 100%;
        max-width: 200px;
        text-align: center;
    }
}

/* ============================================
   5. Submission Preview (提交预览页面)
   ============================================ */

/* 预览页面容器 */
.submission-preview-page {
    padding: var(--spacing-lg) 0;
}

.submission-preview-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 提交预览主容器 */
.submission-preview {
    min-height: calc(100vh - 120px);
    padding: var(--spacing-xl) 0;
    position: relative;
}

/* 页面头部 */
.submission-preview .page-header {
    margin-bottom: var(--spacing-lg);
}

.page-header-row {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-lg);
    position: relative;
}

.back-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: #f5f5f5;
    color: var(--color-primary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
    white-space: nowrap;
    margin-left: auto;
}

.back-link:hover {
    background-color: var(--color-primary);
    color: #ffffff;
    border-color: var(--color-primary);
    text-decoration: none;
}

.submission-preview .page-title {
    color: var(--color-primary);
    font-family: var(--font-family-primary);
    font-size: 1.8rem;
    flex: 1;
    text-align: center;
}

/* 预览区域 */
.preview-section {
    background-color: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

/* 答题预览中选项的p标签样式重置 */
.question-options .option-content p {
    margin-bottom: 0;
    line-height: inherit;
}

/* 响应式 */
@media (max-width: 768px) {
    .submission-preview .page-title {
        font-size: 1.5rem;
        text-align: left;
    }
    
    .page-header-row {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
    
    .back-link {
        margin-left: 0;
        padding: calc(var(--spacing-xs) + 2px) var(--spacing-sm);
        font-size: 0.85rem;
    }
}

/* 预览头部 */
.preview-header {
    background-color: #ffffff;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    margin-bottom: var(--spacing-lg);
}

.preview-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.preview-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    font-size: 0.9rem;
    color: var(--color-secondary);
}

/* 分数展示 */
.score-display {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: #fafafa;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-lg);
}

.score-label {
    font-size: 0.9rem;
    color: var(--color-secondary);
}

.score-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
}

.score-total {
    font-size: 1rem;
    color: var(--color-secondary);
}

/* 题目答案预览 */
.answer-preview-item {
    background-color: #ffffff;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    margin-bottom: var(--spacing-md);
}

.answer-preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.answer-preview-number {
    font-weight: 600;
    color: var(--color-primary);
}

.answer-preview-score {
    font-size: 0.9rem;
    font-weight: 600;
}

.answer-preview-score.correct {
    color: var(--color-success);
}

.answer-preview-score.incorrect {
    color: var(--color-error);
}

.answer-preview-content {
    margin-bottom: var(--spacing-md);
}

.answer-preview-answer {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-light);
    border-radius: var(--radius-sm);
}

.answer-preview-label {
    font-size: 0.85rem;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-xs);
}

.answer-preview-value {
    font-size: 0.95rem;
    line-height: 1.6;
}

/* 参考答案 */
.reference-answer {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: #f6ffed;
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--color-success);
}

.reference-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-success);
    margin-bottom: var(--spacing-xs);
}

.reference-content {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--color-primary);
}