<?php
/**
 * 上一篇下一篇首页&相关推荐
 * @package RelatedPosts
 * @author 石头厝
 * @version 5.6
 * @link https://www.shitoucuo.com
 */
class RelatedPosts_Plugin implements Typecho_Plugin_Interface
{
    public static function activate()
    {
        // 只注册footer钩子，避免header冲突
        Typecho_Plugin::factory('Widget_Archive')->footer = array('RelatedPosts_Plugin', 'footer');
        return _t('插件已激活');
    }

    public static function deactivate()
    {
        return _t('插件已禁用');
    }

    public static function config(Typecho_Widget_Helper_Form $form)
    {
        // 上一篇/下一篇设置
        $showNav = new Typecho_Widget_Helper_Form_Element_Radio(
            'showNav',
            array('1' => _t('显示'), '0' => _t('不显示')),
            '1',
            _t('是否显示上一篇/下一篇导航')
        );
        $form->addInput($showNav);

        // 相关推荐设置
        $showRelated = new Typecho_Widget_Helper_Form_Element_Radio(
            'showRelated',
            array('1' => _t('显示'), '0' => _t('不显示')),
            '1',
            _t('是否显示相关推荐')
        );
        $form->addInput($showRelated);

        // 显示数量
        $postsNum = new Typecho_Widget_Helper_Form_Element_Text(
            'postsNum', NULL, '6', 
            _t('相关文章显示数量'),
            _t('每次显示的相关文章数量')
        );
        $form->addInput($postsNum->addRule('isInteger', _t('请输入整数')));

        // 卡片尺寸
        $cardSize = new Typecho_Widget_Helper_Form_Element_Radio(
            'cardSize',
            array(
                'small' => _t('小卡片'),
                'medium' => _t('中卡片'),
                'large' => _t('大卡片')
            ),
            'small',
            _t('相关推荐卡片尺寸')
        );
        $form->addInput($cardSize);
    }

    public static function personalConfig(Typecho_Widget_Helper_Form $form){}

    /**
     * 获取上一篇/下一篇文章
     */
    private static function getAdjacentPosts($cid)
    {
        $db = Typecho_Db::get();
        
        $prevPost = $db->fetchRow($db->select()->from('table.contents')
            ->where('cid < ?', $cid)
            ->where('type = ?', 'post')
            ->where('status = ?', 'publish')
            ->order('cid', Typecho_Db::SORT_DESC)
            ->limit(1));

        $nextPost = $db->fetchRow($db->select()->from('table.contents')
            ->where('cid > ?', $cid)
            ->where('type = ?', 'post')
            ->where('status = ?', 'publish')
            ->order('cid', Typecho_Db::SORT_ASC)
            ->limit(1));

        return array(
            'prev' => $prevPost,
            'next' => $nextPost
        );
    }

    /**
     * 获取文章封面 - 增强版：支持各种图片格式和插件排版
     */
    private static function getPostThumbnail($postArray)
    {
        if (!is_array($postArray) || empty($postArray)) {
            return '';
        }
        
        // 方法1：优先检查自定义字段缩略图
        $thumbnail = self::getThumbnailFromFields($postArray);
        if (!empty($thumbnail)) {
            return $thumbnail;
        }
        
        $text = isset($postArray['text']) ? $postArray['text'] : '';
        
        // 如果文章内容为空，返回空
        if (empty($text)) {
            return '';
        }
        
        // 方法2：使用DOM解析器提取图片（最可靠的方法）
        $thumbnail = self::extractImageWithDom($text);
        if (!empty($thumbnail)) {
            return $thumbnail;
        }
        
        // 方法3：使用正则表达式匹配多种格式
        $thumbnail = self::extractImageWithRegex($text);
        if (!empty($thumbnail)) {
            return $thumbnail;
        }
        
        // 没有找到图片
        return '';
    }
    
    /**
     * 从自定义字段获取缩略图
     */
    private static function getThumbnailFromFields($postArray)
    {
        if (isset($postArray['fields'])) {
            try {
                if (is_string($postArray['fields'])) {
                    $fields = @unserialize($postArray['fields']);
                    if (is_array($fields)) {
                        // 尝试常见的缩略图字段名
                        $thumbnailFields = ['thumb', 'thumbnail', 'cover', 'image', 'featured_image'];
                        foreach ($thumbnailFields as $field) {
                            if (!empty($fields[$field])) {
                                $thumb = trim($fields[$field]);
                                return self::processImageUrl($thumb);
                            }
                        }
                        
                        // 检查所有字段，寻找可能的图片URL
                        foreach ($fields as $fieldValue) {
                            if (is_string($fieldValue) && !empty($fieldValue)) {
                                $fieldValue = trim($fieldValue);
                                // 检查是否是图片URL
                                if (preg_match('/\.(jpg|jpeg|png|gif|webp|bmp|svg)$/i', $fieldValue) || 
                                    preg_match('/<img[^>]+src=["\']([^"\']+)["\']/i', $fieldValue, $matches)) {
                                    
                                    $thumb = !empty($matches[1]) ? $matches[1] : $fieldValue;
                                    return self::processImageUrl($thumb);
                                }
                            }
                        }
                    }
                }
            } catch (Exception $e) {
                // 忽略错误，继续其他方法
            }
        }
        
        return '';
    }
    
    /**
     * 使用DOM解析器提取图片（最可靠）
     */
    private static function extractImageWithDom($html)
    {
        // 检查是否支持DOMDocument
        if (!class_exists('DOMDocument')) {
            return '';
        }
        
        try {
            $dom = new DOMDocument();
            libxml_use_internal_errors(true); // 抑制HTML解析错误
            
            // 添加HTML包装，确保能正确解析片段
            $wrappedHtml = '<!DOCTYPE html><html><head><meta charset="UTF-8"></head><body>' . $html . '</body></html>';
            $dom->loadHTML($wrappedHtml, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
            
            $images = $dom->getElementsByTagName('img');
            
            // 查找第一张合适的图片
            foreach ($images as $img) {
                // 尝试多个可能的src属性
                $src = $img->getAttribute('src');
                if (empty($src)) {
                    $src = $img->getAttribute('data-src'); // 懒加载图片
                }
                if (empty($src)) {
                    $src = $img->getAttribute('data-lazy-src'); // WordPress懒加载
                }
                if (empty($src)) {
                    $src = $img->getAttribute('data-original'); // 其他懒加载
                }
                
                // 跳过base64图片和空src
                if (!empty($src) && strpos($src, 'data:image') !== 0) {
                    // 检查图片尺寸，跳过太小的图标
                    $width = $img->getAttribute('width');
                    $height = $img->getAttribute('height');
                    
                    // 如果不是图标大小，返回它
                    if ((empty($width) || $width > 50) && (empty($height) || $height > 50)) {
                        $processedUrl = self::processImageUrl($src);
                        if (!empty($processedUrl)) {
                            return $processedUrl;
                        }
                    }
                }
            }
            
            // 如果没有找到合适的img标签，检查背景图片
            $elements = $dom->getElementsByTagName('*');
            foreach ($elements as $element) {
                $style = $element->getAttribute('style');
                if (preg_match('/background(-image)?\s*:\s*url\(["\']?([^"\'()]+)["\']?\)/i', $style, $matches)) {
                    if (!empty($matches[2])) {
                        $processedUrl = self::processImageUrl($matches[2]);
                        if (!empty($processedUrl)) {
                            return $processedUrl;
                        }
                    }
                }
            }
            
        } catch (Exception $e) {
            // 忽略DOM解析错误
        }
        
        return '';
    }
    
    /**
     * 使用正则表达式提取图片
     */
    private static function extractImageWithRegex($text)
    {
        // 解码HTML实体
        $text = html_entity_decode($text, ENT_QUOTES, 'UTF-8');
        
        // 定义多个匹配模式（按优先级排序）
        $patterns = [
            // 标准img标签，支持各种属性
            '/<img[^>]+(?:src|data-src|data-lazy-src|data-original)=["\']([^"\'>]+)["\'][^>]*>/i',
            
            // Markdown图片格式
            '/!\[[^\]]*\]\(([^)]+)\)/i',
            
            // 背景图片
            '/background(-image)?:\s*url\(["\']?([^"\'()]+)["\']?\)/i',
            
            // 简化的img标签（没有引号）
            '/<img[^>]+(?:src|data-src|data-lazy-src|data-original)=([^ >]+)[^>]*>/i',
            
            // 直接匹配图片URL（最后的手段）
            '/(https?:\/\/[^\s<>"\']+\.(?:jpg|jpeg|png|gif|webp|bmp|svg)(?:\?[^\s<>"\']*)?)/i'
        ];
        
        foreach ($patterns as $pattern) {
            if (preg_match($pattern, $text, $matches)) {
                // 确定哪个分组包含URL
                $url = null;
                for ($i = 1; $i < count($matches); $i++) {
                    if (!empty($matches[$i]) && strpos($matches[$i], 'http') !== false) {
                        $url = trim($matches[$i]);
                        break;
                    }
                }
                
                if (!empty($url)) {
                    // 清理URL
                    $url = preg_replace('/["\']$/', '', $url); // 移除末尾的引号
                    $url = preg_replace('/\?.*$/', '', $url); // 移除查询参数
                    
                    // 跳过base64和占位符
                    if (strpos($url, 'data:image') === 0 || 
                        strpos($url, 'placeholder') !== false ||
                        strpos($url, 'blank') !== false) {
                        continue;
                    }
                    
                    $processedUrl = self::processImageUrl($url);
                    if (!empty($processedUrl)) {
                        return $processedUrl;
                    }
                }
            }
        }
        
        return '';
    }
    
    /**
     * 处理图片URL，将相对路径转为绝对路径
     */
    private static function processImageUrl($url)
    {
        if (empty($url)) {
            return '';
        }
        
        $url = trim($url);
        
        // 跳过base64图片
        if (strpos($url, 'data:image') === 0) {
            return '';
        }
        
        // 已经是完整URL或协议相对URL
        if (strpos($url, 'http') === 0 || strpos($url, '//') === 0) {
            return filter_var($url, FILTER_VALIDATE_URL) ? $url : '';
        }
        
        // 相对路径处理
        $options = Helper::options();
        $siteUrl = rtrim($options->siteUrl, '/');
        
        // 清理URL
        $url = ltrim($url, './');
        
        // 如果以斜杠开头，直接拼接
        if (strpos($url, '/') === 0) {
            return $siteUrl . $url;
        }
        
        // 否则添加到站点URL后
        return $siteUrl . '/' . $url;
    }

    /**
     * 获取相关文章 - 确保按分类推荐
     */
    public static function getRelatedPosts($cid, $limit = 6)
    {
        $db = Typecho_Db::get();
        
        try {
            // 首先获取当前文章的所有分类ID
            $currentCats = $db->fetchAll($db->select('mid')
                ->from('table.relationships')
                ->where('cid = ?', $cid));
            
            $related = array();
            
            if (!empty($currentCats)) {
                $catIds = array();
                foreach ($currentCats as $cat) {
                    $catIds[] = $cat['mid'];
                }
                
                // 获取这些分类下的所有文章（不包括当前文章）
                $postsInCats = $db->fetchAll($db->select('DISTINCT c.cid')
                    ->from('table.contents AS c')
                    ->join('table.relationships AS r', 'c.cid = r.cid')
                    ->where('c.type = ?', 'post')
                    ->where('c.status = ?', 'publish')
                    ->where('c.cid != ?', $cid)
                    ->where('r.mid IN ?', $catIds)
                    ->order('RAND()'));
                
                // 如果分类下的文章足够，直接随机选取
                if (count($postsInCats) >= $limit) {
                    shuffle($postsInCats);
                    $selectedCids = array_slice($postsInCats, 0, $limit);
                    $selectedCids = array_column($selectedCids, 'cid');
                    
                    // 获取这些文章的完整信息
                    $related = $db->fetchAll($db->select()
                        ->from('table.contents')
                        ->where('type = ?', 'post')
                        ->where('status = ?', 'publish')
                        ->where('cid IN ?', $selectedCids));
                } 
                // 如果分类下的文章不足，先显示分类下的，再补充随机
                else {
                    // 先获取分类下的所有文章
                    $related = $db->fetchAll($db->select('c.*')
                        ->from('table.contents AS c')
                        ->join('table.relationships AS r', 'c.cid = r.cid')
                        ->where('c.type = ?', 'post')
                        ->where('c.status = ?', 'publish')
                        ->where('c.cid != ?', $cid)
                        ->where('r.mid IN ?', $catIds)
                        ->group('c.cid')
                        ->limit($limit));
                    
                    // 如果还不够，补充随机文章
                    if (count($related) < $limit) {
                        $need = $limit - count($related);
                        $exclude = array($cid);
                        foreach ($related as $post) {
                            $exclude[] = $post['cid'];
                        }
                        
                        $random = $db->fetchAll($db->select()
                            ->from('table.contents')
                            ->where('type = ?', 'post')
                            ->where('status = ?', 'publish')
                            ->where('cid NOT IN ?', $exclude)
                            ->order('RAND()')
                            ->limit($need));
                        
                        $related = array_merge($related, $random);
                    }
                }
            } 
            // 如果文章没有分类，直接返回随机文章
            else {
                $related = $db->fetchAll($db->select()
                    ->from('table.contents')
                    ->where('type = ?', 'post')
                    ->where('status = ?', 'publish')
                    ->where('cid != ?', $cid)
                    ->order('RAND()')
                    ->limit($limit));
            }
            
            // 确保返回数量正确
            if (count($related) > $limit) {
                $related = array_slice($related, 0, $limit);
            }
            
        } catch (Exception $e) {
            // 出错时返回随机文章
            $related = $db->fetchAll($db->select()
                ->from('table.contents')
                ->where('type = ?', 'post')
                ->where('status = ?', 'publish')
                ->where('cid != ?', $cid)
                ->order('RAND()')
                ->limit($limit));
        }
        
        return $related;
    }

    /**
     * 生成文章链接
     */
    private static function getPermalink($postArray)
    {
        if (!is_array($postArray) || empty($postArray)) {
            return '#';
        }
        
        $options = Helper::options();
        $slug = isset($postArray['slug']) ? $postArray['slug'] : '';
        
        if (!empty($slug)) {
            return Typecho_Common::url($slug . '.html', $options->index);
        } else {
            $cid = isset($postArray['cid']) ? $postArray['cid'] : 0;
            return Typecho_Common::url('archives/' . $cid . '/', $options->index);
        }
    }

    /**
     * 输出文章导航和相关推荐
     */
    public static function output()
    {
        if (!Typecho_Widget::widget('Widget_Archive')->is('single')) {
            return;
        }
        
        $widget = Typecho_Widget::widget('Widget_Archive');
        $options = Helper::options();
        $config = $options->plugin('RelatedPosts');
        $currentCid = $widget->cid;
        
        // 生成随机种子，确保每次刷新都不同
        $randomSeed = isset($_GET['refresh_related']) ? intval($_GET['refresh_related']) : 1;
        
        $html = '<div class="posts-navigation-container">';
        
        // 输出CSS样式（内联在HTML中，避免FOUC）
        $html .= '<style>' . self::getStyles() . '</style>';
        
        // 输出上一篇/下一篇导航（如果启用）
        if ($config->showNav) {
            $adjacent = self::getAdjacentPosts($currentCid);
            
            $html .= '<div class="posts-navigation">';
            
            // 上一篇
            if (!empty($adjacent['prev'])) {
                $prev = $adjacent['prev'];
                $prevPermalink = self::getPermalink($prev);
                $prevTitle = isset($prev['title']) ? $prev['title'] : '';
                
                $html .= '<a href="' . $prevPermalink . '" class="nav-prev" title="' . htmlspecialchars($prevTitle) . '">';
                $html .= '<div class="nav-content">';
                $html .= '<span class="nav-label">上一篇</span>';
                $html .= '<span class="nav-title single-line">' . htmlspecialchars(self::truncateText($prevTitle, 20)) . '</span>';
                $html .= '</div>';
                $html .= '</a>';
            } else {
                $html .= '<div class="nav-prev disabled">';
                $html .= '<div class="nav-content">';
                $html .= '<span class="nav-label">上一篇</span>';
                $html .= '<span class="nav-title single-line">没有更多了</span>';
                $html .= '</div>';
                $html .= '</div>';
            }
            
            // 首页链接 - 更换为更简单好看的图标
            $html .= '<a href="' . $options->index . '/" class="nav-home" title="返回首页">';
            $html .= '<span class="nav-home-icon"><i class="iconfont icon-shiliangzhinengduixiang18-01"></i></span>';
            $html .= '</a>';
            
            // 下一篇
            if (!empty($adjacent['next'])) {
                $next = $adjacent['next'];
                $nextPermalink = self::getPermalink($next);
                $nextTitle = isset($next['title']) ? $next['title'] : '';
                
                $html .= '<a href="' . $nextPermalink . '" class="nav-next" title="' . htmlspecialchars($nextTitle) . '">';
                $html .= '<div class="nav-content">';
                $html .= '<span class="nav-label">下一篇</span>';
                $html .= '<span class="nav-title single-line">' . htmlspecialchars(self::truncateText($nextTitle, 20)) . '</span>';
                $html .= '</div>';
                $html .= '</a>';
            } else {
                $html .= '<div class="nav-next disabled">';
                $html .= '<div class="nav-content">';
                $html .= '<span class="nav-label">下一篇</span>';
                $html .= '<span class="nav-title single-line">没有更多了</span>';
                $html .= '</div>';
                $html .= '</div>';
            }
            
            $html .= '</div>';
        }
        
        // 输出相关推荐（如果启用）
        if ($config->showRelated) {
            $relatedPosts = self::getRelatedPosts($currentCid, $config->postsNum);
            
            if (!empty($relatedPosts)) {
                $cardSize = isset($config->cardSize) ? $config->cardSize : 'small';
                
                $html .= '<div id="related-posts-container" class="related-posts-section card-size-' . $cardSize . '">';
                $html .= '<div class="related-header">';
                $html .= '<h3 class="related-title">相关推荐</h3>';
                // 使用随机种子确保每次刷新都不同
                $html .= '<a href="?refresh_related=' . ($randomSeed + 1) . '#related-posts-container" class="refresh-btn">';
                $html .= '<span class="refresh-icon">⟳</span> 换一批';
                $html .= '</a>';
                $html .= '</div>';
                $html .= '<div class="related-posts-grid">';
                
                foreach ($relatedPosts as $post) {
                    $html .= self::getPostCardHtml($post);
                }
                
                $html .= '</div>';
                $html .= '</div>';
            }
        }
        
        $html .= '</div>';
        
        echo $html;
    }

    /**
     * 生成文章卡片HTML
     */
    private static function getPostCardHtml($postArray)
    {
        if (!is_array($postArray) || empty($postArray)) {
            return '';
        }
        
        $title = isset($postArray['title']) ? $postArray['title'] : '无标题';
        $created = isset($postArray['created']) ? $postArray['created'] : time();
        $commentsNum = isset($postArray['commentsNum']) ? $postArray['commentsNum'] : 0;
        
        $permalink = self::getPermalink($postArray);
        
        // 获取封面图 - 使用增强的方法
        $thumbnail = self::getPostThumbnail($postArray);
        
        $html = '<div class="related-post-card">';
        
        if (!empty($thumbnail)) {
            $html .= '<div class="post-thumb">';
            $html .= '<a href="' . $permalink . '" title="' . htmlspecialchars($title) . '">';
            $html .= '<img src="' . htmlspecialchars($thumbnail) . '" alt="' . htmlspecialchars($title) . '" loading="lazy" onerror="this.style.display=\'none\';this.parentNode.parentNode.className=\'post-thumb no-thumb\';">';
            
            // 日期标签 - 添加透明度
            $html .= '<div class="post-date-overlay">' . date('m-d', $created) . '</div>';
            
            if ($commentsNum > 0) {
                // 评论标签 - 添加透明度
                $html .= '<div class="post-comments-overlay">' . $commentsNum . '评</div>';
            }
            
            $html .= '</a>';
            $html .= '</div>';
        } else {
            $html .= '<div class="post-thumb no-thumb">';
            $html .= '<a href="' . $permalink . '" title="' . htmlspecialchars($title) . '">';
            $html .= '<div class="no-thumb-placeholder">📄</div>';
            
            // 日期标签 - 添加透明度
            $html .= '<div class="post-date-overlay">' . date('m-d', $created) . '</div>';
            
            if ($commentsNum > 0) {
                // 评论标签 - 添加透明度
                $html .= '<div class="post-comments-overlay">' . $commentsNum . '评</div>';
            }
            
            $html .= '</a>';
            $html .= '</div>';
        }
        
        $html .= '<div class="post-content">';
        $html .= '<h4 class="post-title"><a href="' . $permalink . '">' . htmlspecialchars(self::truncateText($title, 28)) . '</a></h4>';
        $html .= '</div>';
        
        $html .= '</div>';
        
        return $html;
    }

    /**
     * 截断文本
     */
    private static function truncateText($text, $length = 20)
    {
        if (mb_strlen($text, 'UTF-8') > $length) {
            return mb_substr($text, 0, $length, 'UTF-8') . '...';
        }
        return $text;
    }

    /**
     * 输出CSS
     */
    public static function footer()
    {
        // 保留footer方法，但不输出任何内容（因为CSS已经内联了）
        // 这个方法只是为了保持向后兼容性
    }

    /**
     * 获取CSS样式
     */
    private static function getStyles()
    {
        // 返回您原始的CSS，完全不变
        return '
        /* 上一篇下一篇标题只显示一行 */
        .posts-navigation .nav-title {
            font-size: 15px;
            font-weight: 500;
            line-height: 1.3;
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        
        .posts-navigation .nav-title.single-line {
            -webkit-line-clamp: 1;
        }
        
        /* 导航和相关推荐容器 */
        .posts-navigation-container {
            margin: 30px 0 0px;
            max-width: 100%;
        }
        
        /* 上一篇/下一篇导航 */
        .posts-navigation {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            margin-bottom: 30px;
            padding: 20px;
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            border-radius: 20px;
            border: 1px solid #dc2626;
            border-bottom: 0px solid #dc2626;
            border-top: 0px solid #dc2626;
        }
        
        .posts-navigation .nav-prev,
        .posts-navigation .nav-next {
            flex: 1;
            display: flex;
            align-items: center;
            padding: 15px;
            background: #fff;
            border-radius: 8px;
            text-decoration: none;
            color: #333;
            border: 1px solid #e1e5e9;
            transition: all 0.3s ease;
            min-height: 70px;
        }
        
        .posts-navigation .nav-prev:hover,
        .posts-navigation .nav-next:hover {
            transform: translateY(-2px);
            border-color: #1e87f0;
            color: #1e87f0;
        }
        
        .posts-navigation .nav-prev.disabled,
        .posts-navigation .nav-next.disabled {
            background: #f8f9fa;
            color: #999;
            cursor: not-allowed;
            opacity: 0.7;
        }
        
        .posts-navigation .nav-content {
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        
        .posts-navigation .nav-label {
            font-size: 12px;
            color:rgb(156 163 175 / var(--tw-text-opacity));
            margin-bottom: 4px;
        }
        
        /* 首页链接 - 更换为更简单大气的图标 */
        .posts-navigation .nav-home {
            width: 50px;
            height: 50px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #1e87f0 0%, #0d6efd 100%);
            border-radius: 50%;
            text-decoration: none;
            color: white;
            border: 1px solid #1e87f0;
            transition: all 0.3s ease;
            font-size: 20px;
        }
        
        .posts-navigation .nav-home:hover {
            background: linear-gradient(135deg, #0d6efd 0%, #0b5ed7 100%);
            transform: scale(1.1);
            border-color: #0d6efd;
        }
        
        /* 相关推荐部分 */
        .related-posts-section {
            background: #f8f9fa;
            border-radius: 20px;
            padding: 25px;
            border: 1px solid #dc2626;
            border-bottom: 0px solid #dc2626;
            border-top: 0px solid #dc2626;
        }
        
        .related-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 2px solid #e8e8e8;
        }
        
        .related-title {
            margin: 0;
            font-size: 20px;
            font-weight: 600;
            color: #333;
            position: relative;
            padding-left: 0; /* 移除左边的内边距 */
        }
        
        /* 移除相关推荐标题前的竖线 */
        .related-title:before {
            display: none; /* 隐藏竖线 */
        }
        
        .refresh-btn {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 20px;
            background: #fff;
            border: 1px solid #ddd;
            border-radius: 6px;
            color: #666;
            cursor: pointer;
            font-size: 14px;
            font-weight: 500;
            transition: all 0.3s ease;
            text-decoration: none;
        }
        
        .refresh-btn:hover {
            background: #1e87f0;
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 3px 10px rgba(30, 135, 240, 0.2);
            border-color: #1e87f0;
        }
        
        .refresh-icon {
            font-size: 16px;
            font-weight: bold;
            display: inline-block;
            animation: spin 1.5s linear infinite;
        }
        
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        
        .refresh-btn:hover .refresh-icon {
            animation: spin 0.8s linear infinite;
        }
        
        /* 相关文章网格 */
        .related-posts-grid {
            display: grid;
            gap: 20px;
        }
        
        /* 小卡片样式 */
        .card-size-small .related-posts-grid {
            grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
        }
        
        .card-size-small .related-post-card {
            background: #fff;
            border-radius: 8px;
            overflow: hidden;
            transition: all 0.3s ease;
            border: 1px solid #eee;
            display: flex;
            flex-direction: column;
            position: relative;
        }
        
        .card-size-small .post-thumb {
            width: 100%;
            height: 120px;
            overflow: hidden;
            background: #f5f5f5;
            position: relative;
        }
        
        .card-size-small .post-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        
        /* 中卡片样式 */
        .card-size-medium .related-posts-grid {
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        }
        
        .card-size-medium .related-post-card {
            background: #fff;
            border-radius: 8px;
            overflow: hidden;
            transition: all 0.3s ease;
            border: 1px solid #eee;
            display: flex;
            flex-direction: column;
            position: relative;
        }
        
        .card-size-medium .post-thumb {
            width: 100%;
            height: 160px;
            overflow: hidden;
            background: #f5f5f5;
            position: relative;
        }
        
        .card-size-medium .post-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        
        /* 大卡片样式 */
        .card-size-large .related-posts-grid {
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 24px;
        }
        
        .card-size-large .related-post-card {
            background: #fff;
            border-radius: 10px;
            overflow: hidden;
            transition: all 0.3s ease;
            border: 1px solid #eee;
            display: flex;
            flex-direction: column;
            position: relative;
        }
        
        .card-size-large .post-thumb {
            width: 100%;
            height: 180px;
            overflow: hidden;
            background: #f5f5f5;
            position: relative;
        }
        
        .card-size-large .post-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        
        /* 通用卡片悬停效果 */
        .related-post-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 8px 25px rgba(0,0,0,0.1);
            border-color: #1e87f0;
        }
        
        .related-post-card:hover .post-thumb img {
            transform: scale(1.08);
        }
        
        /* 封面图片上的标签 - 添加透明度 */
        .post-date-overlay {
            position: absolute;
            top: 8px;
            left: 8px;
            background: #f15a22;
            opacity:0.5;
            color: white;
            font-size: 12px;
            padding: 3px 8px;
            border-radius: 3px;
            font-weight: 500;
        }
        
        .post-comments-overlay {
            position: absolute;
            top: 8px;
            right: 8px;
            background:#f15a22;
            color: white;
            opacity:0.5;
            font-size: 12px;
            padding: 3px 8px;
            border-radius: 3px;
            font-weight: 500;
        }
        
        /* 无缩略图样式 */
        .post-thumb.no-thumb {
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }
        
        .no-thumb-placeholder {
            font-size: 32px;
            opacity: 0.7;
            color: white;
        }
        
        /* 内容区域 */
        .post-content {
            padding: 15px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        
        .post-title {
            margin: 0;
            font-size: 14px;
            line-height: 1.4;
            font-weight: 500;
        }
        
        .card-size-medium .post-title {
            font-size: 16px;
        }
        
        .card-size-large .post-title {
            font-size: 17px;
        }
        
        .post-title a {
            color: #333;
            text-decoration: none;
            transition: color 0.3s;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        
        .post-title a:hover {
            color: #1e87f0;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .posts-navigation {
                flex-direction: column;
                gap: 15px;
            }
            
            .posts-navigation .nav-prev,
            .posts-navigation .nav-next {
                width: 100%;
            }
            
            .posts-navigation .nav-home {
                order: 3;
                width: 100%;
                height: auto;
                border-radius: 8px;
                padding: 12px;
            }
            
            .related-header {
                flex-direction: column;
                align-items: flex-start;
                gap: 15px;
            }
            
            .refresh-btn {
                align-self: flex-start;
            }
            
            .card-size-large .related-posts-grid,
            .card-size-medium .related-posts-grid,
            .card-size-small .related-posts-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 15px;
            }
        }
        
        @media (max-width: 480px) {
            .related-posts-section {
                padding: 20px;
            }
            
            .card-size-large .related-posts-grid,
            .card-size-medium .related-posts-grid,
            .card-size-small .related-posts-grid {
                grid-template-columns: 1fr;
                gap: 15px;
            }
            
            .posts-navigation {
                padding: 15px;
            }
        }
        
        /* 夜间模式支持 */
        .dark .posts-navigation {
            background: #1d1d1e;
            border: 1px solid #dc2626;
            border-bottom: 0px solid #dc2626;
            border-top: 0px solid #dc2626;
        }
        
        .dark .posts-navigation .nav-prev,
        .dark .posts-navigation .nav-next,
        .dark .posts-navigation .nav-home {
            background: rgb(10 12 25 / 1);
            border-color: #333;
            color:rgb(156 163 175 / var(--tw-text-opacity));
        }
        
        
        .dark .posts-navigation .nav-prev.disabled,
        .dark .posts-navigation .nav-next.disabled {
            background: #4a5568;
            color: #a0aec0;
        }
        
        .dark .posts-navigation .nav-home {
            background: rgb(10 12 25 / 1);
            border-color: #333;
        }
           .dark .related-posts-section {
            background: #1d1d1e;
            border: 1px solid #dc2626;
            border-bottom: 0px solid #dc2626;
            border-top: 0px solid #dc2626;
        }
        
        .dark .related-header {
            border-color: #333;
        }
        
        .dark .related-title {
            color: rgb(156 163 175 / var(--tw-text-opacity));
        }
        
        .dark .refresh-btn {
            background: rgb(10 12 25 / 1);
            color:rgb(156 163 175 / var(--tw-text-opacity));
            border-color: #333;
        }
        
        
        .dark .related-post-card {
            background: rgb(10 12 25 / 1);
            border-color: #333;
        }
        
        .dark .post-title a {
            color: rgb(156 163 175 / var(--tw-text-opacity));
        }
        
        .dark .post-title a:hover {
            color: #f15a22;
        }
        
        .dark .post-thumb {
            background: #718096;
        }
        
        .dark .post-thumb.no-thumb {
            background: linear-gradient(135deg, #4c51bf 0%, #805ad5 100%);
        }
        
        .dark .post-date-overlay {
            background:#f15a22;
            color: #fff;
        }
        
        .dark .post-comments-overlay {
            background: #f15a22;
            color:#fff;
        }
        ';
    }
}