javascript:(function(){
    const oldWrapper = document.getElementById('ftb-ext-wrapper');
    if(oldWrapper) oldWrapper.remove();
    const style = document.createElement('style');
    style.id = 'ftb-ext-style';
    style.innerHTML = `
        #ftb-ext-wrapper { font-family: sans-serif; }
        #ftb-ext-sidebar { position: fixed; top: 32px; right: 0; width: 30%; height: calc(100% - 32px); background: #F5F5DC; border-left: 2px solid #800000; z-index: 9999; display: flex; flex-direction: column; color: #800000; box-shadow: -2px 0 5px rgba(0,0,0,0.2); }
        #ftb-ext-header { padding: 10px; border-bottom: 1px solid #800000; background: #F5F5DC; position: relative; }
        #ftb-ext-close-btn { position: absolute; top: 10px; right: 10px; cursor: pointer; background: #fff; border: 1px solid #800000; padding: 2px 5px; font-size: 12px; }
        #ftb-ext-update-btn { position: absolute; top: 35px; right: 10px; cursor: pointer; background: #fff; border: 1px solid #800000; padding: 2px 5px; font-size: 12px; }
        .ftb-ext-input-row { margin-bottom: 5px; display: flex; align-items: center; width: calc(100% - 45px); }
        .ftb-ext-input-row label { width: 40px; font-size: 12px; }
        .ftb-ext-input-box { flex: 1; border: 1px solid #ccc; padding: 2px; box-sizing: border-box; background: #fff; min-height: 20px; white-space: nowrap; overflow: hidden; font-size: 13px; }
        .ftb-ext-input-box:empty:before { content: attr(data-placeholder); color: #888; }
        #ftb-ext-jump-btn { cursor: pointer; background: #fff; border: 1px solid #800000; padding: 2px 5px; margin-left: 5px; font-size: 10px; }
        #ftb-ext-list { flex: 1; overflow-y: auto; padding: 10px; padding-left: 45px; }
        .ftb-ext-item-container { position: relative; margin-bottom: 10px; }
        .ftb-ext-list-copy-btn { position: absolute; left: -35px; top: 0; width: 30px; height: 100%; text-align: center; cursor: pointer; border: none; background: #FFFFFF; color: #800000; font-size: 16px; display: flex; align-items: center; justify-content: center; padding: 0; box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24); transition: all 0.3s ease; }
        .ftb-ext-list-copy-btn:hover { box-shadow: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23); }
        .ftb-ext-item { border: 1px solid #800000; padding: 5px; cursor: pointer; background: #F0E0D6; color: #800000; font-size: 14px; word-break: break-all; min-height: 40px;}
        .ftb-ext-highlight { background-color: yellow; color: black; font-weight: bold; }
        .ftb-ext-cite-count { color: green; font-weight: bold; margin-left: 5px; font-size: 12px; }
        #ftb-ext-modal-bg { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.7); z-index: 10000; display: flex; align-items: center; justify-content: center; }
        #ftb-ext-modal { background: #FFFFEE; border: 3px solid #800000; width: 60%; max-height: 90%; display: flex; flex-direction: column; position: relative; }
        #ftb-ext-modal-close { position: absolute; top: 5px; right: 10px; cursor: pointer; font-weight: bold; z-index: 10001; }
        #ftb-ext-modal-content { padding: 20px; overflow-y: auto; flex: 1; }
        .ftb-ext-original-box { display: flow-root; min-height: 100px; }
        .ftb-ext-modal-btn-row { display: flex; gap: 10px; padding: 15px 0; border-top: 1px solid #800000; border-bottom: 1px dashed #800000; margin: 15px 0; }
        .ftb-ext-modal-btn { cursor: pointer; border: none; box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24); background: #FFFFFF; color: #800000; padding: 5px 10px; font-size: 12px; transition: all 0.3s ease; }
    `;
    document.head.appendChild(style);

    const wrapper = document.createElement('div');
    wrapper.id = 'ftb-ext-wrapper';
    document.body.appendChild(wrapper);

    const sidebar = document.createElement('div');
    sidebar.id = 'ftb-ext-sidebar';
    wrapper.appendChild(sidebar);

    const header = document.createElement('div');
    header.id = 'ftb-ext-header';
    sidebar.appendChild(header);

    const closeBtn = document.createElement('button');
    closeBtn.id = 'ftb-ext-close-btn';
    closeBtn.innerText = '終了';
    header.appendChild(closeBtn);

    const updateBtn = document.createElement('button');
    updateBtn.id = 'ftb-ext-update-btn';
    updateBtn.innerText = '更新';
    header.appendChild(updateBtn);

    let initSearch = 'お願いします';
    let initHlStr = '';
    try {
        initSearch = localStorage.getItem('ftbExtSearch') || 'お願いします';
        initHlStr = localStorage.getItem('ftbExtHl') || '';
    } catch(e) {}

    const searchRow = document.createElement('div');
    searchRow.className = 'ftb-ext-input-row';
    searchRow.innerHTML = '<label>検索:</label><div contenteditable="true" id="ftb-ext-search-input" class="ftb-ext-input-box" data-placeholder="検索ワード..."></div>';
    header.appendChild(searchRow);
    const searchInput = document.getElementById('ftb-ext-search-input');
    searchInput.innerText = initSearch;

    const hlRow = document.createElement('div');
    hlRow.className = 'ftb-ext-input-row';
    hlRow.innerHTML = '<label>強調:</label><div contenteditable="true" id="ftb-ext-hl-input" class="ftb-ext-input-box" data-placeholder="ここにワード..."></div><button id="ftb-ext-jump-btn">▼</button>';
    header.appendChild(hlRow);
    const hlInput = document.getElementById('ftb-ext-hl-input');
    hlInput.innerText = initHlStr;
    const jumpBtn = document.getElementById('ftb-ext-jump-btn');

    const listArea = document.createElement('div');
    listArea.id = 'ftb-ext-list';
    sidebar.appendChild(listArea);

    let allRepliesMap = new Map();
    let citingMap = new Map();
    let hlElements = [];
    let hlIndex = 0;
    let autoUpdateTimer = null;

    closeBtn.onclick = () => { 
        wrapper.remove(); 
        style.remove(); 
        allRepliesMap.clear();
        citingMap.clear();
        hlElements = [];
        if(autoUpdateTimer) clearInterval(autoUpdateTimer);
    };

    updateBtn.onclick = () => {
        renderList();
    };

    jumpBtn.onclick = () => {
        if(hlElements.length === 0) return;
        if(hlIndex >= hlElements.length) hlIndex = 0;
        hlElements[hlIndex].scrollIntoView({ behavior: 'smooth', block: 'center' });
        hlIndex++;
    };

    const hasImage = (replyElement) => {
        const links = replyElement.querySelectorAll('a');
        for (let a of links) {
            const href = a.href.toLowerCase();
            if (href.endsWith('.jpg') || href.endsWith('.png') || href.endsWith('.gif') || href.endsWith('.webp')) return true;
        }
        return !!replyElement.querySelector('img');
    };

    const copyToClipboard = (text, btn, originalText) => {
        navigator.clipboard.writeText(text).then(() => {
            btn.innerText = 'OK';
            setTimeout(() => btn.innerText = originalText, 1000);
        });
    };

    const scanAndMapReplies = () => {
        allRepliesMap.clear();
        citingMap.clear();
        document.querySelectorAll('td.rtd').forEach(reply => {
            const bq = reply.querySelector('blockquote');
            if(!bq) return;
            const resNumEl = reply.querySelector('.no_quote, .cno');
            const resNum = resNumEl ? resNumEl.innerText.replace('No.', '') : null;
            if(!resNum) return;
            const html = bq.innerHTML;
            const lines = html.split(/<br\s*\/?>/i).map(line => {
                const temp = document.createElement('div');
                temp.innerHTML = line;
                return temp.innerText.trim();
            });
            const cleanLines = lines.filter(l => !l.startsWith('>') && !l.startsWith('＞') && !l.startsWith('&gt;'));
            allRepliesMap.set(resNum, {
                element: reply,
                cleanText: cleanLines.join('\n'),
                cleanLines: cleanLines,
                allLines: lines
            });
        });

        allRepliesMap.forEach((bData, bNum) => {
            let citedNums = new Set();
            bData.allLines.forEach(line => {
                const text = line.trim();
                if (/^(?:>|&gt;)(?!(?:>|&gt;|＞))/.test(text) && !text.includes('1000なら')) {
                    const numMatch = text.match(/No\.(\d+)/);
                    if (numMatch) citedNums.add(numMatch[1]);
                    const cleanQLine = text.replace(/^(?:>|&gt;|\s)+/, '').trim();
                    if (cleanQLine.length >= 5) {
                        allRepliesMap.forEach((aData, aNum) => {
                            if (aNum !== bNum && aData.cleanLines.includes(cleanQLine)) citedNums.add(aNum);
                        });
                    }
                }
            });
            citedNums.forEach(aNum => {
                if(!citingMap.has(aNum)) citingMap.set(aNum, new Set());
                citingMap.get(aNum).add(bNum);
            });
        });
    };

    const showModal = (resNum) => {
        const data = allRepliesMap.get(resNum);
        if(!data) return;
        const bg = document.createElement('div');
        bg.id = 'ftb-ext-modal-bg';
        const modal = document.createElement('div');
        modal.id = 'ftb-ext-modal';
        const close = document.createElement('span');
        close.id = 'ftb-ext-modal-close';
        close.innerText = '× 閉じる';
        close.onclick = () => { bg.remove(); renderList(); };
        const content = document.createElement('div');
        content.id = 'ftb-ext-modal-content';
        const originalBox = document.createElement('div');
        originalBox.className = 'ftb-ext-original-box';
        originalBox.innerHTML = data.element.innerHTML;
        content.appendChild(originalBox);
        const btnRow = document.createElement('div');
        btnRow.className = 'ftb-ext-modal-btn-row';
        const quoteFull = data.allLines.map(l => '>' + l).join('\n');
        const quotedCleanText = data.cleanText.split('\n').map(l => '>' + l).join('\n');
        [
            { label: 'レス番号', text: `>No.${resNum}` },
            { label: '全文', text: quoteFull },
            { label: '本文(引用除外)', text: quotedCleanText }
        ].forEach(config => {
            const b = document.createElement('button');
            b.className = 'ftb-ext-modal-btn';
            b.innerText = config.label;
            b.onclick = (e) => { e.stopPropagation(); copyToClipboard(config.text, b, config.label); };
            btnRow.appendChild(b);
        });
        content.appendChild(btnRow);
        const citers = citingMap.has(resNum) ? Array.from(citingMap.get(resNum)) : [];
        if(citers.length > 0) {
            const citeArea = document.createElement('div');
            citeArea.innerHTML = '<strong style="color:green;">引用レス一覧:</strong>';
            citers.forEach(cNum => {
                const cData = allRepliesMap.get(cNum);
                if(cData) {
                    const cBox = document.createElement('div');
                    cBox.style.cssText = 'background:#F0E0D6; border:1px solid #800000; padding:10px; margin-top:10px; display:flow-root; font-size:14px; color:#800000; min-height:100px;';
                    const img = cData.element.querySelector('img');
                    if (img) {
                        const imgContainer = img.closest('a') ? img.closest('a').cloneNode(true) : img.cloneNode(true);
                        imgContainer.style.float = 'left';
                        imgContainer.style.margin = '0 10px 10px 0';
                        cBox.appendChild(imgContainer);
                    }
                    const formattedLines = cData.allLines.map(l => {
                        if (/^(?:>|&gt;)/.test(l.trim())) return `<span style="color:#117743;">${l}</span>`;
                        return l;
                    }).join('<br>');
                    const textDiv = document.createElement('div');
                    textDiv.innerHTML = `<strong>No.${cNum}</strong><br>${formattedLines}`;
                    cBox.appendChild(textDiv);
                    citeArea.appendChild(cBox);
                }
            });
            content.appendChild(citeArea);
        }
        modal.appendChild(close);
        modal.appendChild(content);
        bg.appendChild(modal);
        bg.onclick = (e) => { if(e.target === bg) { bg.remove(); renderList(); } };
        wrapper.appendChild(bg);
    };

    const renderList = () => {
        listArea.innerHTML = '';
        hlElements = [];
        hlIndex = 0;
        const keywordStr = searchInput.innerText.replace(/\r?\n/g, ' ').trim();
        const hlWordStr = hlInput.innerText.replace(/\r?\n/g, ' ').trim();
        try {
            localStorage.setItem('ftbExtSearch', keywordStr);
            localStorage.setItem('ftbExtHl', hlWordStr);
        } catch(e) {}
        if (!keywordStr) return;
        const keywords = keywordStr.split(/[\s　]+/).filter(k => k);
        const hlWords = hlWordStr ? hlWordStr.split(/[\s　]+/).filter(k => k) : [];
        
        scanAndMapReplies();
        const fragment = document.createDocumentFragment();
        allRepliesMap.forEach((data, resNum) => {
            if(!keywords.some(kw => data.cleanText.includes(kw))) return;
            let displayText = data.cleanText;
            
            if (hlWords.length > 0) {
                const escapedWords = hlWords.map(w => w.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'));
                const regex = new RegExp(`(${escapedWords.join('|')})`, 'gi');
                displayText = displayText.replace(regex, `<span class="ftb-ext-highlight">$1</span>`);
            }
            
            const citers = citingMap.has(resNum) ? Array.from(citingMap.get(resNum)) : [];
            if(citers.length > 0) displayText += `<span class="ftb-ext-cite-count">引用(${citers.length})</span>`;
            
            const container = document.createElement('div');
            container.className = 'ftb-ext-item-container';
            const copyBtn = document.createElement('button');
            copyBtn.className = 'ftb-ext-list-copy-btn';
            copyBtn.innerText = '❏';
            copyBtn.onclick = (e) => { 
                e.stopPropagation(); 
                const quotedCleanText = data.cleanText.split('\n').map(l => '>' + l).join('\n');
                copyToClipboard(quotedCleanText, copyBtn, '❏'); 
            };
            const item = document.createElement('div');
            item.className = 'ftb-ext-item';
            item.innerHTML = (hasImage(data.element) ? '⧉ ' : '') + displayText;
            item.onclick = () => showModal(resNum);
            container.appendChild(copyBtn);
            container.appendChild(item);
            fragment.appendChild(container);
        });
        listArea.appendChild(fragment);
        hlElements = Array.from(listArea.querySelectorAll('.ftb-ext-highlight'));
    };

    searchInput.addEventListener('keydown', (e) => { if(e.key === 'Enter') { e.preventDefault(); renderList(); } });
    hlInput.addEventListener('keydown', (e) => { if(e.key === 'Enter') { e.preventDefault(); renderList(); } });
    
    renderList();

    let lastReplyCount = document.querySelectorAll('td.rtd').length;
    autoUpdateTimer = setInterval(() => {
        const currentReplyCount = document.querySelectorAll('td.rtd').length;
        if(currentReplyCount !== lastReplyCount) {
            lastReplyCount = currentReplyCount;
            if(searchInput.innerText.trim() !== '') {
                renderList();
            }
        }
    }, 2000);
})();