* Helper function to simulate BookUI view mode detection * This mirrors the logic in BookUI.detectViewMode() * @param {number} width - Screen wi

* Helper function to check if element meets minimum touch target size * @param {HTMLElement} element - DOM element to check * @returns {object}

* Helper function to create a mock element with specified styles * @param {string} selector - CSS selector/class name * @param {object} styles -

* Helper function to extract text content from HTML * @param {string} html - HTML string * @returns {string} Plain text content

* 检查字体家族是否匹配预期类型 * @param {string} fontFamily - 实际的字体家族值 * @param {string} expectedType - 预期的字体类型 ('serif' | 'sans' | 'mono') * @returns {boo

* Helper function to normalize whitespace for comparison * @param {string} text - Text to normalize * @returns {string} Normalized text (removes

* Helper function to create a fresh BookUI instance for testing * @param {number} currentPage - Current page number * @param {number} totalPages

* 检查字体家族是否是三种定义的字体之一 * @param {string} fontFamily - 字体家族值 * @returns {boolean}

* Helper function to parse CSS value to pixels * @param {string} value - CSS value (e.g., '44px', '2.75rem') * @param {number} baseFontSize - Ba

* 显示目录

* Helper function to determine expected view mode based on screen width * @param {number} width - Screen width in pixels * @returns {string} - E

* 隐藏继续阅读弹窗

* Helper function to measure content height * @param {string} htmlContent - HTML content to measure * @returns {number} Height in pixels

* 显示封面

* 绑定继续阅读弹窗事件 * Requirements: 7.2, 7.3

* 绑定事件监听器

* 缓存 DOM 元素

* 检查是否有保存的阅读进度，并显示继续阅读提示 * Requirements: 7.2, 7.3

* Create a PageRenderer instance for testing * This mirrors the PageRenderer from app.js

* 获取章节信息 * @param {number} chapterNumber - 章节编号 * @returns {Object|null} 章节信息对象

* 隐藏加载动画 * 实现平滑的过渡效果从加载动画到内容 * Requirements: 8.5

* 渲染目录内容

* 设置当前视图状态 * @param {string} view - 视图名称

* 显示继续阅读弹窗 * Requirements: 7.2

* 更新继续阅读弹窗中的章节信息 * @param {Object} chapter - 章节信息对象 * @param {number} pageNumber - 页码 * Requirements: 7.2

* Helper function to create a mock window object for testing * @param {number} width - Screen width in pixels * @returns {object} - Mock window-

* Helper function to get computed style value * @param {HTMLElement} element - DOM element * @param {string} property - CSS property name * @

* 获取当前视图状态 * @returns {string} 当前视图 ('cover' | 'toc' | 'chapter')

* 处理"继续阅读"按钮点击 * 跳转到上次阅读的位置 * Requirements: 7.3

* 处理封面"开始阅读"按钮点击

* 处理"从头开始"按钮点击 * 关闭弹窗，显示封面 * Requirements: 7.2

* 处理目录"返回封面"按钮点击

* 初始化应用

* 显示加载动画 * Requirements: 8.5

* 更新目录中的已读标记 * 在目录已渲染后，根据最新的已读状态更新视觉反馈 * Requirements: 7.4