// ==UserScript==
// @name         ✨学习通AI助手极速版｜不限次数永久使用
// @namespace    http://tampermonkey.net/
// @version      2.1.2
// @description  无需配置，采用DeepSeek-Flash强力驱动，识题准、答题快、正确率高。支持章节/作业/考试页面，界面简洁稳定，持续适配平台更新。
// @author       kail
// @match        *://*.chaoxing.com/*
// @grant        GM_xmlhttpRequest
// @grant        GM_addStyle
// @grant        GM_getResourceText
// @grant        GM_setValue
// @grant        GM_getValue
// @connect      api.116611.xyz
// @resource     typrMd5Lib https://116611.xyz/typr-md5.js
// @resource     fontTableData https://116611.xyz/table.json
// @tag          AI答题
// @tag          网课助手
// @tag          免费试用
// @tag          工具类
// @tag          在线教育
// @tag          超星学习通
// @tag          长期维护
// @antifeature  payment  脚本存在第三方答题接口付费功能
// @icon         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

// @license All Rights Reserved
// ==/UserScript==




     const systemConfig = {
        buildTime: new Date().toISOString(),
        environment: 'production'
    };
    class Logger {
        constructor(prefix) {
            this.prefix = prefix || 'System';
            this.levels = ['DEBUG', 'INFO', 'WARN', 'ERROR'];
        }

        log(level, message) {
            if (this.levels.includes(level)) {
                const timestamp = new Date().toISOString();
            }
        }

        debug(msg) { this.log('DEBUG', msg); }
        info(msg) { this.log('INFO', msg); }
        warn(msg) { this.log('WARN', msg); }
        error(msg) { this.log('ERROR', msg); }
    }


    const logger = new Logger('CXHelper');

    const browserCheck = {
        isChrome: () => /Chrome/.test(navigator.userAgent),
        isFirefox: () => /Firefox/.test(navigator.userAgent),
        isEdge: () => /Edge/.test(navigator.userAgent),
        isSafari: () => /Safari/.test(navigator.userAgent) && !/Chrome/.test(navigator.userAgent)
    };


    class PerformanceMonitor {
        constructor() {
            this.metrics = new Map();
            this.startTimes = new Map();
        }

        start(name) {
            this.startTimes.set(name, performance.now());
        }

        end(name) {
            const startTime = this.startTimes.get(name);
            if (startTime) {
                const duration = performance.now() - startTime;
                this.metrics.set(name, duration);
                this.startTimes.delete(name);
                return duration;
            }
            return 0;
        }

        getMetric(name) {
            return this.metrics.get(name) || 0;
        }
    }


    const perfMonitor = new PerformanceMonitor();


    const utils = {

        generateId: (length = 8) => {
            const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
            let result = '';
            for (let i = 0; i < length; i++) {
                result += chars.charAt(Math.floor(Math.random() * chars.length));
            }
            return result;
        },


        deepClone: (obj) => {
            if (obj === null || typeof obj !== 'object') return obj;
            if (obj instanceof Date) return new Date(obj.getTime());
            if (obj instanceof Array) return obj.map(item => utils.deepClone(item));
            if (typeof obj === 'object') {
                const cloned = {};
                Object.keys(obj).forEach(key => {
                    cloned[key] = utils.deepClone(obj[key]);
                });
                return cloned;
            }
        },


        debounce: (func, wait) => {
            let timeout;
            return function executedFunction(...args) {
                const later = () => {
                    clearTimeout(timeout);
                    func(...args);
                };
                clearTimeout(timeout);
                timeout = setTimeout(later, wait);
            };
        },


        throttle: (func, limit) => {
            let inThrottle;
            return function() {
                const args = arguments;
                const context = this;
                if (!inThrottle) {
                    func.apply(context, args);
                    inThrottle = true;
                    setTimeout(() => inThrottle = false, limit);
                }
            }
        }
    };

    class CacheManager {
        constructor(maxSize = 100) {
            this.cache = new Map();
            this.maxSize = maxSize;
        }

        set(key, value, ttl = 300000) { // 默认5分钟过期
            if (this.cache.size >= this.maxSize) {
                const firstKey = this.cache.keys().next().value;
                this.cache.delete(firstKey);
            }

            const item = {
                value: value,
                expiry: Date.now() + ttl
            };
            this.cache.set(key, item);
        }

        get(key) {
            const item = this.cache.get(key);
            if (!item) return null;

            if (Date.now() > item.expiry) {
                this.cache.delete(key);
                return null;
            }

            return item.value;
        }

        clear() {
            this.cache.clear();
        }
    }

    const cacheManager = new CacheManager();


    logger.info('System initialization completed');

(function() {
    'use strict';


(function(){
    function _b64ToBytes(b64){ const bin = atob(b64); const out = new Uint8Array(bin.length); for(let i=0;i<bin.length;i++) out[i] = bin.charCodeAt(i); return out; }
    function _bytesToStr(arr){ let s=''; for(let i=0;i<arr.length;i++) s += String.fromCharCode(arr[i]); return s; }
    function _strToBytes(s){ const out = new Uint8Array(s.length); for(let i=0;i<s.length;i++) out[i] = s.charCodeAt(i); return out; }
    function _xor(a,b){ const out=new Uint8Array(a.length); for(let i=0;i<a.length;i++) out[i] = a[i] ^ b[i % b.length]; return out; }
    const __S = [100, 121, 96, 105, 102, 109, 113, 102, 115, 96, 116, 98, 109, 117, 96, 51, 49, 51, 54].map(c=>c-1);
    const __SALT = String.fromCharCode.apply(null, __S);
    const __ENC = "idiM9YBNCEBSu80fAcWJtglB3UgCOQSNSUCG2EFbmlWW7AyIJkSb/kgNWgCHsoEA";
    function __getDSK(){
        try {
            const step1 = __ENC.split('').reverse().join('');
            const xored = _b64ToBytes(step1);
            const plainB64Bytes = _xor(xored, _strToBytes(__SALT));
            const plainB64 = _bytesToStr(plainB64Bytes);
            return atob(plainB64);
        } catch (e) { return ''; }
    }
    window.__getDeepseekKey = __getDSK;
})();


const DEEPSEEK_PROXY_BASE = 'https://api.116611.xyz';

const DEEPSEEK_MODEL = 'deepseek-chat';
const DEEPSEEK_API_URL = `${DEEPSEEK_PROXY_BASE}/v1/chat/completions`;

function deepseekChat(messages, options = {}) {
    return new Promise((resolve, reject) => {
        try {
            GM_xmlhttpRequest({
                method: 'POST',
                url: DEEPSEEK_API_URL,
                headers: {
                    'Content-Type': 'application/json',
                    'X-App-Token': __getDSAuth()
                },
                data: JSON.stringify({ model: DEEPSEEK_MODEL, messages, ...options }),
                timeout: 60000,
                onload: (r) => {
                    if (r.status >= 200 && r.status < 300) {
                        try { resolve(JSON.parse(r.responseText)); } catch (e) { reject(e); }
                    } else {
                        reject(new Error(`HTTP ${r.status}: ${String(r.responseText || '').slice(0,200)}`));
                    }
                },
                onerror: () => reject(new Error('Network error')),
                ontimeout: () => reject(new Error('Timeout'))
            });
        } catch (err) {
            reject(err);
        }
    });
}
    let isAnswering = false;
    let isStudyingChapters = false;
    let studyIntervalId = null;
    const PANEL_REG_KEY = 'cx_helper_active_panel_v2';
    const PANEL_INSTANCE_ID = `${Date.now()}_${Math.random().toString(36).slice(2, 8)}`;
    const FRAME_DEPTH = (() => { let d = 0; try { let w = window; while (w !== w.top) { d++; w = w.parent; } } catch { d = 999; } return d; })();
    let isActiveOwner = false;
    let createdPanelEl = null;
    const HEARTBEAT_INTERVAL_MS = 2000;
    const STALE_MS = 7000;
    let heartbeatTimerId = null;
    let lastAutoSkipTs = 0;
    let emptyChecksCount = 0;
    let lastEmptySectionKey = '';
    let currentStudySectionKey = '';
    let chapterQuizHandledSectionKey = '';
    let chapterQuizEnteringSectionKey = '';
    let chapterQuizEnterRetryAt = 0;

    function isChapterStudyFrameHostUrl(url) {
        return /^https:\/\/mooc1\.chaoxing\.com\/mycourse\/studentstudy\?chapterId(?:=|%3D)/.test(String(url || ''));
    }

    function isChapterStudyPageContext() {
        try {
            if (isChapterStudyFrameHostUrl(window.top.location.href)) return true;
        } catch {}
        try {
            if (isChapterStudyFrameHostUrl(location.href)) return true;
        } catch {}
        return false;
    }

    function shouldPreferOuterFramePanel() {
        try {
            return isChapterStudyFrameHostUrl(window.top.location.href);
        } catch {
            return isChapterStudyFrameHostUrl(location.href);
        }
    }

    function isPanelBlockedPage(url) {
        try {
            const u = new URL(String(url || location.href), location.origin);
            if (u.hostname === 'passport2.chaoxing.com') return true;
            if (u.hostname === 'www.chaoxing.com' && (u.pathname === '/' || u.pathname === '')) return true;
        } catch {}
        return false;
    }


    const API_BASE = 'https://116611.xyz';
    const MONEY_YUAN = (() => {
        try {
            const b64 = 'OC4wMA==';
            return atob(b64);
        } catch {
            return '8.00';
        }
    })();
    const PAY_NAME = 'xHelper 解锁/赞助';
    const DEFAULT_PAY = 'alipay';
    const LS_KEY_DEV_ID = 'cxhelper_device_id';
    const LS_KEY_FREE = 'cxhelper_free_used';
    const LS_KEY_LICENSED = 'cxhelper_licensed';
    const POLL_MS_PAY = 3000;
    const POLL_MAX_PAY = 100;


    const getFreeLimit = (() => {
        let cached = null;
        return function() {
            if (cached != null) return cached;
            try {

                const b64 = 'JDEw';
                const decoded = atob(b64);
                const n = parseInt(decoded.replace(/\D/g, ''), 10);
                cached = Number.isFinite(n) ? n : 10;
            } catch {
                cached = 10;
            }
            return cached;
        };
    })();

    function getDeviceIdPaid() {
        try {
            let id = '';

            // Prefer cookie so all chaoxing subdomains share one deviceId.
            id = getCookie(LS_KEY_DEV_ID);
            if (!id) id = localStorage.getItem(LS_KEY_DEV_ID) || '';
            if (!id) {
                id = ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c => (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16));
            }

            try { localStorage.setItem(LS_KEY_DEV_ID, id); } catch {}
            try { setCookie(LS_KEY_DEV_ID, id, 3650, '.chaoxing.com'); } catch {}
            return id;
        } catch { return 'dev_' + Math.random().toString(36).slice(2); }
    }
    const DEVICE_ID_PAID = getDeviceIdPaid();

    function getCookie(key) {
        try {
            const name = key + '=';
            const parts = document.cookie.split(';');
            for (let part of parts) {
                const s = part.trim();
                if (s.indexOf(name) === 0) return decodeURIComponent(s.substring(name.length));
            }
            return '';
        } catch { return ''; }
    }
    function setCookie(key, value, days, domain) {
        try {
            const d = new Date();
            d.setTime(d.getTime() + ((days || 365) * 24 * 60 * 60 * 1000));
            const expires = 'expires=' + d.toUTCString();
            const dm = domain ? ';domain=' + domain : '';
            document.cookie = key + '=' + encodeURIComponent(value) + ';path=/' + ';' + expires + dm;
        } catch {}
    }
    function isLocallyLicensed() {
        try {

            const c = getCookie(LS_KEY_LICENSED);
            if (c === '1') return true;
            return localStorage.getItem(LS_KEY_LICENSED) === '1';
        } catch { return false; }
    }
    function setLocallyLicensed() {
        try { localStorage.setItem(LS_KEY_LICENSED, '1'); } catch {}

        try { setCookie(LS_KEY_LICENSED, '1', 365, '.chaoxing.com'); } catch {}
    }
    function getFreeUsedCount() {
        try { return parseInt(localStorage.getItem(LS_KEY_FREE) || '0', 10) || 0; } catch { return 0; }
    }
    function incFreeUsedCount() {
        try { const n = getFreeUsedCount() + 1; localStorage.setItem(LS_KEY_FREE, String(n)); return n; } catch { return 0; }
    }

    async function checkLicensePaid(forceCloud = false) {
        if (isLocallyLicensed()) return true;
        if (!forceCloud) return false;

        try {
            const r = await fetch(`${API_BASE}/api/license/status?deviceId=${encodeURIComponent(DEVICE_ID_PAID)}`, { credentials: 'omit' });
            const ct = (r.headers.get('content-type') || '').toLowerCase();
            const data = ct.includes('application/json') ? await r.json() : await r.text();
            const ok = !!(data && data.licensed);
            if (ok) setLocallyLicensed();
            return ok;
        } catch { return false; }
    }

    async function startPaymentPaid(payType) {
        const win = window.open('', '_blank');
        try {
            const resp = await fetch(`${API_BASE}/api/create`, {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({
                    name: PAY_NAME,
                    money: MONEY_YUAN,
                    type: payType || DEFAULT_PAY,
                    param: DEVICE_ID_PAID
                })
            });
            const html = await resp.text();
            win.document.open();
            win.document.write(html);
            win.document.close();
            return true;
        } catch (e) {
            if (win) win.close();
            alert('发起支付失败：' + e.message);
            return false;
        }
    }

    async function pollUntilLicensedPaid(onProgress) {
        for (let i = 0; i < POLL_MAX_PAY; i++) {
            if (onProgress) { try { onProgress(i); } catch {} }
            const ok = await checkLicensePaid(true);
            if (ok) { setLocallyLicensed(); return true; }
            await new Promise(r => setTimeout(r, POLL_MS_PAY));
        }
        return false;
    }

    function showPayModalPaid(messageText) {
        return new Promise(resolve => {
            const mask = document.createElement('div');
            mask.style.cssText = 'position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:999998;backdrop-filter:blur(4px);';
            const box = document.createElement('div');
            box.style.cssText = 'position:fixed;left:50%;top:120px;transform:translateX(-50%);width:420px;background:#fff;border-radius:16px;box-shadow:0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);overflow:hidden;z-index:999999;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Arial;';
            const msg = messageText || '试用已用完，打赏8元永久解锁哦';
            box.innerHTML = (
                '<div style="padding:18px 24px;border-bottom:1px solid #f3f4f6;font-weight:700;font-size:16px;color:#111827;">解锁全部功能（永久）</div>' +
                '<div style="padding:24px;">' +
                    '<div style="margin-bottom:16px;font-size:14px;color:#4b5563;line-height:1.5;">' + msg + '</div>' +
                    '<div style="margin-bottom:10px;background:#f9fafb;padding:16px;border-radius:12px;border:1px solid #f3f4f6;">' +
                        '<div style="display:flex;gap:20px;">' +
                            '<label style="display:flex;align-items:center;gap:8px;cursor:pointer;font-size:14px;font-weight:500;color:#374151;"><input type="radio" name="cx_pay" value="alipay" checked style="accent-color:#6366f1;"> 支付宝</label>' +
                            '<label style="display:none;align-items:center;gap:8px;cursor:pointer;font-size:14px;font-weight:500;color:#374151;"><input type="radio" name="cx_pay" value="wxpay" style="accent-color:#6366f1;"> 微信支付</label>' +
                        '</div>' +
                    '</div>' +
                    '<div id="cx_tip_paid" style="color:#6b7280;font-size:13px;line-height:1.5;padding:0 4px;">点击"去支付"将打开收银台，完成后此处会自动检测。</div>' +
                '</div>' +
                '<div style="padding:16px 24px;background:#f9fafb;border-top:1px solid #f3f4f6;text-align:right;display:flex;justify-content:flex-end;gap:12px;">' +
                    '<button id="cx_cancel_paid" style="padding:10px 20px;border-radius:10px;border:1px solid #e5e7eb;background:#fff;color:#4b5563;cursor:pointer;font-size:14px;font-weight:600;transition:all 0.2s;">取消</button>' +
                    '<button id="cx_go_pay" style="padding:10px 24px;border-radius:10px;border:none;background:#6366f1;color:#fff;cursor:pointer;font-size:14px;font-weight:600;transition:all 0.2s;box-shadow:0 4px 6px -1px rgba(99, 102, 241, 0.2);">去支付</button>' +
                '</div>'
            );
            document.body.appendChild(mask);
            document.body.appendChild(box);

            const tip = box.querySelector('#cx_tip_paid');
            const btnPay = box.querySelector('#cx_go_pay');
            const btnCancel = box.querySelector('#cx_cancel_paid');

            function close() { try { box.remove(); mask.remove(); } catch {} }

            btnCancel.onclick = () => { close(); resolve(false); };
            btnPay.onclick = async () => {
                btnPay.disabled = true;
                btnPay.textContent = '打开收银台...';
                const payType = (box.querySelector('input[name="cx_pay"]:checked') || {}).value || DEFAULT_PAY;
                const ok = await startPaymentPaid(payType);
                if (!ok) { btnPay.disabled = false; btnPay.textContent = '去支付'; return; }
                btnPay.textContent = '检测支付中...';
                if (tip) tip.innerHTML = '已打开收银台，请完成支付，完成后此处会自动解锁...<br><span style="color:#6366f1;font-size:12px;margin-top:4px;display:block;font-weight:600;">💡 若无法打开支付页面请尝试连接手机热点网络</span>';
                const done = await pollUntilLicensedPaid();
                if (done) {
                    if (tip) tip.textContent = '支付成功，正在解锁...';
                    setLocallyLicensed();
                    try { updateTrialBadge(); } catch {}
                    setTimeout(() => { close(); resolve(true); }, 500);
                } else {
                    btnPay.disabled = false;
                    btnPay.textContent = '去支付';
                    if (tip) tip.textContent = '未检测到支付完成，可重试或稍后再次打开本面板。';
                }
            };
        });
    }

    function showFeedbackModal() {
        const mask = document.createElement('div');
        mask.style.cssText = 'position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:999998;backdrop-filter:blur(4px);';
        const box = document.createElement('div');
        box.style.cssText = 'position:fixed;left:50%;top:120px;transform:translateX(-50%);width:400px;background:#fff;border-radius:16px;box-shadow:0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);overflow:hidden;z-index:999999;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Arial;';
        box.innerHTML = (
            '<div style="padding:18px 24px;border-bottom:1px solid #f3f4f6;font-weight:700;font-size:16px;color:#111827;">意见反馈</div>' +
            '<div style="padding:24px;text-align:center;">' +
                '<div style="margin-bottom:20px;font-size:14px;color:#4b5563;line-height:1.6;">' +
                    '如果您在使用过程中遇到问题或有任何建议，欢迎通过以下方式联系我们：' +
                '</div>' +
                '<div style="background:#f9fafb;border:1px solid #f3f4f6;border-radius:12px;padding:20px;margin:16px 0;">' +
                    '<div style="font-size:13px;font-weight:600;color:#6366f1;margin-bottom:8px;text-transform:uppercase;letter-spacing:0.05em;">联系邮箱</div>' +
                    '<div style="font-size:18px;font-weight:700;color:#111827;cursor:pointer;display:inline-block;padding:4px 8px;border-radius:6px;transition:background 0.2s;" onclick="navigator.clipboard.writeText(\'3893504084@qq.com\')" title="点击复制" onmouseover="this.style.background=\'#eef2ff\'" onmouseout="this.style.background=\'transparent\'">3893504084@qq.com</div>' +
                    '<div style="font-size:12px;color:#9ca3af;margin-top:8px;">点击邮箱地址即可复制</div>' +
                '</div>' +
                '<div style="font-size:13px;color:#6b7280;margin-top:16px;line-height:1.5;">我们将会认真对待每一条反馈，并且尽快回复您的问题。您的建议是我们改进产品的重要动力！</div>' +
            '</div>' +
            '<div style="padding:16px 24px;background:#f9fafb;border-top:1px solid #f3f4f6;text-align:right;">' +
                '<button id="feedback-close" style="padding:10px 24px;border-radius:10px;border:none;background:#6366f1;color:#fff;cursor:pointer;font-size:14px;font-weight:600;transition:all 0.2s;box-shadow:0 4px 6px -1px rgba(99, 102, 241, 0.2);">关闭</button>' +
            '</div>'
        );
        document.body.appendChild(mask);
        document.body.appendChild(box);

        const closeBtn = box.querySelector('#feedback-close');
        function close() {
            try {
                box.remove();
                mask.remove();
            } catch {}
        }

        closeBtn.onclick = close;
        mask.onclick = close;


        const emailDiv = box.querySelector('[onclick*="clipboard"]');
        if (emailDiv) {
            emailDiv.addEventListener('click', function() {
                const originalText = this.innerHTML;
                this.innerHTML = '✅ 已复制到剪贴板';
                this.style.color = '#2563eb';
                setTimeout(() => {
                    this.innerHTML = originalText;
                    this.style.color = '#333';
                }, 2000);
            });
        }
    }

    let paymentCancelled = false;

    async function ensureAccessAllowed() {
        if (await checkLicensePaid()) return true;
        const used = getFreeUsedCount();
        if (used < getFreeLimit()) { incFreeUsedCount(); try { updateTrialBadge(); } catch {} return true; }
        if (paymentCancelled) throw new Error('试用已用完，请解锁后继续使用');
        const ok = await showPayModalPaid();
        if (ok) { setLocallyLicensed(); try { updateTrialBadge(); } catch {} return true; }
        paymentCancelled = true;
        throw new Error('试用已用完，请解锁后继续使用');
    }

    function getActivePanelRecord() {
        try { const raw = localStorage.getItem(PANEL_REG_KEY); return raw ? JSON.parse(raw) : null; } catch { return null; }
    }
    function setActivePanelRecord(rec) {
        try { localStorage.setItem(PANEL_REG_KEY, JSON.stringify(rec)); } catch {}
    }
    function clearActivePanelRecordIfOwner() {
        try {
            const cur = getActivePanelRecord();
            if (cur && cur.id === PANEL_INSTANCE_ID) {
                localStorage.removeItem(PANEL_REG_KEY);
            }
        } catch {}
    }
    function shouldWeOwn(current) {
        const nowTs = Date.now();
        if (!current) return { own: true, ts: nowTs };

        if (!current.aliveTs || nowTs - current.aliveTs > STALE_MS) return { own: true, ts: nowTs };

        const currentDepth = Number.isFinite(current.depth) ? current.depth : 0;
        if (shouldPreferOuterFramePanel()) {
            if (FRAME_DEPTH < currentDepth) return { own: true, ts: nowTs };
            if (FRAME_DEPTH > currentDepth) return { own: false, ts: nowTs };
        } else {
            if (FRAME_DEPTH > currentDepth) return { own: true, ts: nowTs };
            if (FRAME_DEPTH < currentDepth) return { own: false, ts: nowTs };
        }

        try { if (current.url && current.url !== location.href) return { own: true, ts: nowTs }; } catch {}
        if (FRAME_DEPTH === currentDepth && nowTs > (current.ts || 0)) return { own: true, ts: nowTs };
        return { own: false, ts: nowTs };
    }
    function claimOwnership() {
        const cur = getActivePanelRecord();
        const decision = shouldWeOwn(cur);
        if (decision.own) {
            setActivePanelRecord({ id: PANEL_INSTANCE_ID, depth: FRAME_DEPTH, ts: decision.ts, aliveTs: Date.now(), url: location.href });
            isActiveOwner = true;
        } else {
            isActiveOwner = false;
        }
        return isActiveOwner;
    }
    function startHeartbeat() {
        if (heartbeatTimerId) return;
        heartbeatTimerId = setInterval(() => {
            if (!isActiveOwner) return;
            const cur = getActivePanelRecord();

            if (!cur || cur.id !== PANEL_INSTANCE_ID) { stopHeartbeat(); return; }
            cur.aliveTs = Date.now();
            try { cur.url = location.href; } catch {}
            setActivePanelRecord(cur);
        }, HEARTBEAT_INTERVAL_MS);
    }
    function stopHeartbeat() { if (heartbeatTimerId) { clearInterval(heartbeatTimerId); heartbeatTimerId = null; } }
    const cleanupOwnership = () => {
        stopHeartbeat();
        clearActivePanelRecordIfOwner();
    };
    window.addEventListener('beforeunload', cleanupOwnership);
    window.addEventListener('pagehide', cleanupOwnership);

    function destroyPanelAndStop() {
        try {
            if (studyIntervalId) { clearInterval(studyIntervalId); studyIntervalId = null; }
            isStudyingChapters = false;
            isAnswering = false;
            stopHeartbeat();
            const panel = document.getElementById('answer-helper-panel');
            if (panel && panel.parentNode) panel.parentNode.removeChild(panel);
            createdPanelEl = null;
        } catch {}
    }
    window.addEventListener('storage', (e) => {
        if (e.key !== PANEL_REG_KEY) return;
        if (isPanelBlockedPage(location.href)) return;
        const rec = getActivePanelRecord();
        if (!rec) return;
        if (rec.id === PANEL_INSTANCE_ID) {

            if (!createdPanelEl) {
                try { createdPanelEl = createPanel(); bindPanelEvents(); } catch {}
            }
            isActiveOwner = true;
            startHeartbeat();
        } else {

            isActiveOwner = false;
            destroyPanelAndStop();
        }
    });


    GM_addStyle(`
        /* Panel: Modern Light Theme */
        #answer-helper-panel {
            --ah-panel-height: 340px;
            position: fixed;
            top: 24px;
            left: 24px;
            width: 320px;
            min-width: 320px;
            max-width: 320px;
            height: var(--ah-panel-height) !important;
            min-height: var(--ah-panel-height) !important;
            max-height: var(--ah-panel-height) !important;
            background: #ffffff;
            border: 1px solid rgba(0, 0, 0, 0.08);
            border-radius: 16px;
            padding: 0;
            z-index: 9999;
            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
            font-family: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: #1f2937;
            user-select: none;
            overflow: hidden;
            transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s ease, height 0.3s ease;
        }

        /* Header */
        #answer-helper-header {
            cursor: move;
            height: 52px;
            padding: 0 18px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: #ffffff;
            border-bottom: 1px solid #f3f4f6;
            font-size: 15px;
            color: #111827;
        }
        #answer-helper-header .title {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            color: #111827;
        }
        #answer-helper-header .title .accent {
            display: inline-block;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: #6366f1;
            box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
        }
        #answer-helper-header .title .version {
            font-size: 11px;
            font-weight: 600;
            line-height: 16px;
            color: #6366f1;
            background: rgba(99, 102, 241, 0.1);
            border-radius: 6px;
            padding: 1px 6px;
            transform: translateY(-1px);
        }
        #answer-helper-header .cx-header-actions {
            display: inline-flex;
            align-items: center;
            gap: 10px;
        }
        #answer-helper-header .cx-collapse-btn {
            width: 32px;
            height: 32px;
            border-radius: 8px;
            background: #f9fafb;
            border: 1px solid #f3f4f6;
            cursor: pointer;
            color: #6b7280;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s ease;
        }
        #answer-helper-header .cx-collapse-btn:hover { background: #f3f4f6; color: #111827; border-color: #e5e7eb; transform: scale(1.05); }
        .cx-collapse-btn-inner { width: 16px; height: 16px; position: relative; }
        .cx-collapse-icon-bar.horizontal { width: 14px; height: 2px; background: currentColor; border-radius: 1px; position: absolute; left: 1px; top: 7px; }
        .cx-collapse-icon-bar.vertical { width: 2px; height: 14px; background: currentColor; border-radius: 1px; position: absolute; left: 7px; top: 1px; }

        /* Content */
        #answer-helper-content { padding: 12px 16px; overflow-y: auto; height: calc(var(--ah-panel-height) - 52px); max-height: calc(var(--ah-panel-height) - 52px); }
        #answer-helper-panel.collapsed #answer-helper-content { display: none; }
        #answer-helper-panel.collapsed { width: 240px; min-width: 240px; max-width: 240px; height: 52px !important; min-height: 52px !important; border-radius: 12px; }

        /* Body: main on top, actions at bottom */
        #answer-helper-content .panel-body {
            display: grid;
            grid-template-columns: 1fr;
            grid-template-rows: auto auto;
            grid-template-areas:
                "main"
                "actions";
            gap: 12px;
            align-items: start;
        }
        .panel-main { min-width: 0; grid-area: main; }
        .panel-actions { grid-area: actions; }
        .panel-actions.panel-row { display: flex; flex-direction: column; gap: 10px; }
        .panel-actions.panel-row .primary-pair { display: flex; gap: 10px; width: 100%; }
        .panel-actions.panel-row .primary-pair .pair-slot { flex: 1; display: flex; }
        .panel-actions.panel-row .primary-pair .pair-slot .ah-btn { flex: 1; min-height: 44px; border-radius: 12px; }
        .panel-actions.panel-row .ah-btn { min-height: 40px; padding: 8px 12px; border-radius: 10px; }

        /* Toast */
        #no-task-toast {
            position: fixed;
            top: 24px;
            right: 24px;
            background: #ffffff;
            border: 1px solid rgba(0,0,0,0.05);
            color: #111827;
            padding: 12px 20px;
            border-radius: 12px;
            font-size: 14px;
            font-weight: 500;
            z-index: 10000;
            box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
            animation: fadeInOut 3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
        }
        @keyframes fadeInOut {
            0% { opacity: 0; transform: translateY(-20px) scale(0.95); }
            10% { opacity: 1; transform: translateY(0) scale(1); }
            90% { opacity: 1; transform: translateY(0) scale(1); }
            100% { opacity: 0; transform: translateY(-20px) scale(0.95); }
        }

        /* Terminal Log */
        #answer-log {
            height: 140px;
            overflow-y: auto;
            border: 1px solid #f3f4f6;
            border-radius: 12px;
            padding: 10px;
            margin-bottom: 8px;
            font-size: 12px;
            line-height: 1.6;
            font-family: 'JetBrains Mono', 'Fira Code', 'Menlo', monospace;
            background: #f9fafb;
            color: #4b5563;
        }
        #answer-log::-webkit-scrollbar { width: 6px; }
        #answer-log::-webkit-scrollbar-track { background: transparent; }
        #answer-log::-webkit-scrollbar-thumb { background: #e5e7eb; border-radius: 10px; }
        #answer-log::-webkit-scrollbar-thumb:hover { background: #d1d5db; }

        .log-item { margin: 4px 0; padding: 6px 10px; border-radius: 8px; background: #ffffff; border: 1px solid #f3f4f6; box-shadow: 0 1px 2px rgba(0,0,0,0.02); }
        .success { color: #059669; border-left: 3px solid #10b981; }
         .error { color: #dc2626; border-left: 3px solid #ef4444; }
         .info  { color: #374151; border-left: 3px solid #6b7280; }
         .debug { color: #6b7280; border-left: 3px solid #9ca3af; }

        /* Buttons */
        .ah-btn {
            flex: 1;
            padding: 8px 14px;
            border: 1px solid #e5e7eb;
            border-radius: 10px;
            font-size: 13px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            color: #374151;
            background: #ffffff;
        }
        .ah-btn:hover { background: #f9fafb; border-color: #d1d5db; transform: translateY(-1px); box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05); }
        .ah-btn:active { transform: translateY(0); box-shadow: none; }

        .ah-primary { background: #6366f1; color: #ffffff; border-color: #4f46e5; }
        .ah-primary:hover { background: #4f46e5; border-color: #4338ca; box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3); }

        .ah-danger { background: #ffffff; color: #ef4444; border-color: #fee2e2; }
        .ah-danger:hover { background: #fef2f2; border-color: #fca5a5; }

        .ah-secondary { background: #f9fafb; color: #4b5563; border-color: #f3f4f6; }
        .ah-secondary:hover { background: #f3f4f6; border-color: #e5e7eb; }

        .ah-success { background: #10b981; color: #ffffff; border-color: #059669; }
        .ah-success:hover { background: #059669; box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3); }

        /* Speed buttons */
        .speed-button { transition: all 0.2s ease; border-radius: 8px; }
        .speed-active { background: #6366f1 !important; color: #ffffff !important; border-color: #4f46e5 !important; }
        #playback-speed-controls.segmented { display: flex; gap: 6px; justify-content: flex-end; margin-top: 6px; }
        #playback-speed-controls.segmented .ah-btn { min-width: 60px; padding: 6px 8px; font-size: 12px; }

        /* Trial Badge */
        #answer-helper-panel .cx-trial-badge { position: absolute; left: 16px; bottom: 12px; color: #9ca3af; font-size: 11px; }
        #answer-helper-panel .cx-trial-badge .trial-buy-btn {
            display: inline-block;
            margin-left: 8px;
            padding: 2px 8px;
            font-size: 11px;
            border: 1px solid #e0e7ff;
            background: #eef2ff;
            color: #4f46e5;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
        }
        #answer-helper-panel .cx-trial-badge .trial-buy-btn:hover { background: #e0e7ff; border-color: #c7d2fe; }
    `);


    
    function getScriptVersion() {
        try {
            if (typeof GM_info !== 'undefined' && GM_info) {
                if (GM_info.script && GM_info.script.version) return String(GM_info.script.version);
                if (GM_info.scriptMetaStr) {
                    const m = /\/\/\s*@version\s+(\S+)/.exec(GM_info.scriptMetaStr);
                    if (m) return m[1];
                }
            }
        } catch (e) {}
        return '';
    }

    function createPanel() {
        let isChapterPage = false;
        try {
            isChapterPage = window.top.location.href.startsWith('https://mooc1.chaoxing.com/mycourse/studentstudy?chapterId');
        } catch (e) {
            // Fallback in case of cross-origin frame access error
            isChapterPage = location.href.startsWith('https://mooc1.chaoxing.com/mycourse/studentstudy?chapterId');
        }
        const panel = document.createElement('div');
        panel.id = 'answer-helper-panel';
        panel.innerHTML = `
            <div id="answer-helper-header">
                <span class="title"><span class="accent"></span>学习通AI助手<span class="version" id="cx-title-version"></span></span>
                <div class="cx-header-actions">
                    <button id="cx-feedback-btn" class="ah-btn ah-secondary" style="min-width:32px; width:32px; height:32px; padding:0; border-radius:8px;">
                        <span class="button-icon" style="margin:0; font-size:14px;">💬</span>
                    </button>
                    <button class="cx-collapse-btn" title="折叠/展开">
                      <span class="cx-collapse-btn-inner">
                        <span class="cx-collapse-icon-bar horizontal"></span>
                      </span>
                    </button>
                </div>
            </div>
            <div id="answer-helper-content">
                <div class="panel-body">
                    <div class="panel-main">
                        <div id="answer-log"></div>
                        <div id="playback-speed-controls" class="segmented" style="display:none;">
                            <button id="speed-1x" class="ah-btn ah-secondary speed-button speed-active"><span class="button-icon">1×</span></button>
                            <button id="speed-1.5x" class="ah-btn ah-secondary speed-button"><span class="button-icon">1.5×</span></button>
                            <button id="speed-2x" class="ah-btn ah-secondary speed-button"><span class="button-icon">2×</span></button>
                        </div>
                    </div>
                    <div class="panel-actions panel-row">
                        <div class="primary-pair">
                            <div class="pair-slot" style="${isChapterPage ? 'display:none;' : ''}">
                                <button id="start-answer" class="ah-btn ah-primary">
                                    <span class="button-icon">▶</span>
                                    <span class="button-text">一键答题</span>
                                </button>
                                <button id="pause-answer" class="ah-btn ah-danger" style="display:none;">
                                    <span class="button-icon">⏸</span>
                                    <span class="button-text">暂停答题</span>
                                </button>
                            </div>
                            <div class="pair-slot" style="${isChapterPage ? 'flex: 1;' : ''}">
                                <button id="start-study" class="ah-btn ah-primary" style="${isChapterPage ? 'width: 100%;' : ''}">
                                    <span class="button-icon">⏯</span>
                                    <span class="button-text">${isChapterPage ? '开始刷章节' : '刷章节与测验'}</span>
                                </button>
                                <button id="pause-study" class="ah-btn ah-danger" style="display:none; ${isChapterPage ? 'width: 100%;' : ''}">
                                    <span class="button-icon">■</span>
                                    <span class="button-text">暂停刷章节</span>
                                </button>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
            <div id="cx_trial_badge" class="cx-trial-badge">
                检测中...
                <button id="buy-license" class="trial-buy-btn" style="display:none">购买授权</button>
            </div>
        `;
        document.body.appendChild(panel);
        try { panel.style.setProperty('--ah-panel-height', '340px'); } catch {}

        
        try {
            const versionEl = panel.querySelector('#cx-title-version');
            const scriptVersion = getScriptVersion();
            if (versionEl) {
                if (scriptVersion) {
                    versionEl.textContent = 'v' + scriptVersion;
                } else {
                    versionEl.style.display = 'none';
                }
            }
        } catch {}


        try {
            const rect = panel.getBoundingClientRect();
            const winW = window.innerWidth || document.documentElement.clientWidth;
            const winH = window.innerHeight || document.documentElement.clientHeight;
            const left = Math.max(12, Math.round((winW - rect.width) / 2));
            let isQuizPage = false;
            try {
                forEachAllSameOriginDocs((doc) => {
                    if (isQuizPage) return;
                    if (isQuizPageDoc(doc)) isQuizPage = true;
                });
            } catch {}
            const centerTop = Math.round((winH - rect.height) / 2);
            const offset = Math.round(winH * 0.1);
            const desiredTop = isQuizPage ? Math.round(winH * 0.08) : (centerTop - offset);
            const top = Math.max(12, Math.min(desiredTop, Math.max(12, winH - rect.height - 12)));
            panel.style.left = left + 'px';
            panel.style.top = top + 'px';
            panel.style.right = 'auto';
        } catch {}


        let isDragging = false, offsetX = 0, offsetY = 0;
        const header = panel.querySelector('#answer-helper-header');
        header.addEventListener('mousedown', function(e) {
            if (e.target.closest('.cx-collapse-btn')) return;
            isDragging = true;
            const rect = panel.getBoundingClientRect();
            offsetX = e.clientX - rect.left;
            offsetY = e.clientY - rect.top;
            document.body.style.userSelect = 'none';
        });
        document.addEventListener('mousemove', function(e) {
            if (!isDragging) return;
            panel.style.left = (e.clientX - offsetX) + 'px';
            panel.style.top = (e.clientY - offsetY) + 'px';
            panel.style.right = 'auto';
        });
        document.addEventListener('mouseup', function() {
            isDragging = false;
            document.body.style.userSelect = '';
        });


        const collapseBtn = panel.querySelector('.cx-collapse-btn');
        const collapseBtnInner = collapseBtn.querySelector('.cx-collapse-btn-inner');
        collapseBtn.addEventListener('click', function() {
            panel.classList.toggle('collapsed');
            collapseBtnInner.innerHTML = '';
            if (panel.classList.contains('collapsed')) {

                const h = document.createElement('span');
                h.className = 'cx-collapse-icon-bar horizontal';
                const v = document.createElement('span');
                v.className = 'cx-collapse-icon-bar vertical';
                collapseBtnInner.appendChild(h);
                collapseBtnInner.appendChild(v);
            } else {

                const h = document.createElement('span');
                h.className = 'cx-collapse-icon-bar horizontal';
                collapseBtnInner.appendChild(h);
            }
        });
        return panel;
    }

    function setPanelFixedHeight(px) {
        const panel = document.getElementById('answer-helper-panel');
        if (!panel) return;
        const val = Math.max(200, Math.round(px || 0)) + 'px';
        try { panel.style.setProperty('--ah-panel-height', val); } catch {}
        try {
            const rect = panel.getBoundingClientRect();
            const winH = window.innerHeight || document.documentElement.clientHeight;
            const maxTop = Math.max(12, winH - rect.height - 12);
            if (rect.top > maxTop) panel.style.top = maxTop + 'px';
        } catch {}
    }

    function bindPanelEvents() {
        document.getElementById('start-answer')?.addEventListener('click', () => {
            addLog('本助手仅供学习研究，请遵守课程与平台规则。', 'info');
            addLog('开始自动答题...');
            autoAnswer();
        });
        document.getElementById('pause-answer')?.addEventListener('click', () => {
            isAnswering = false;
            addLog('正在暂停自动答题...', 'info');
        });
        const startStudyBtn = document.getElementById('start-study');
        const pauseStudyBtn = document.getElementById('pause-study');
        if (startStudyBtn && pauseStudyBtn) {
            startStudyBtn.addEventListener('click', () => {
                addLog('本助手仅供学习研究，请遵守课程与平台规则。', 'info');
                studySessionInitiator = true;
                publishStudySession(true);
                startStudyChapters();
            });
            pauseStudyBtn.addEventListener('click', () => { stopStudyChapters(); });
        }


        document.getElementById('speed-1x')?.addEventListener('click', () => {
            setVideoPlaybackSpeed(1.0);
        });
        document.getElementById('speed-1.5x')?.addEventListener('click', () => {
            setVideoPlaybackSpeed(1.5);
            if (isChapterStudyPageContext()) {
                addLog('⚠️ 章节视频请勿倍速观看，倍速观看可能导致账号异常哦', 'warning');
            }
        });
        document.getElementById('speed-2x')?.addEventListener('click', () => {
            setVideoPlaybackSpeed(2.0);
            if (isChapterStudyPageContext()) {
                addLog('⚠️ 章节视频请勿倍速观看，倍速观看可能导致账号异常哦', 'warning');
            }
        });


        updateSpeedButtonsState();

        const buyBtn = document.getElementById('buy-license');
        if (buyBtn) {
            buyBtn.addEventListener('click', async () => {
                try {
                    await showPayModalPaid('免费试用，打赏8元永久解锁哦');
                } catch (e) {
                    addLog('打开支付弹窗失败: ' + (e && e.message ? e.message : e), 'error');
                }
            });
        }
        document.getElementById('cx-feedback-btn')?.addEventListener('click', () => { showFeedbackModal(); });


        setTimeout(updateTrialBadge, 0);
    }


    function safeClick(el) {
        try {
            if (!el) return false;
            el.click();
            el.dispatchEvent(new MouseEvent('click', { bubbles: true }));
            return true;
        } catch { return false; }
    }


    function forEachSameOriginFrame(callback) {
        const visit = (win) => {
            for (let i = 0; i < win.frames.length; i++) {
                const f = win.frames[i];
                try {
                    const doc = f.document || f.contentDocument;
                    if (doc && doc.location && doc.location.href.includes('.chaoxing.com')) {
                        callback(doc);
                        visit(f);
                    }
                } catch {  }
            }
        };
        try { callback(document); } catch {}
        try { visit(window); } catch {}
    }


    function forEachAllSameOriginDocs(callback) {
        const seen = new Set();
        const visit = (win) => {
            if (!win || seen.has(win)) return;
            seen.add(win);
            try {
                const doc = win.document || win.contentDocument;
                if (doc) callback(doc);
            } catch {}
            try {
                const len = win.frames ? win.frames.length : 0;
                for (let i = 0; i < len; i++) {
                    try { visit(win.frames[i]); } catch {}
                }
            } catch {}
        };
        try { visit(window.top); } catch { visit(window); }
    }


    const QUESTION_CONTAINER_SELECTOR = '.question, .questionLi, .subject_item, .examPaper_subject, .questionContainer, .q-item, .subject_node, .ti-item, .exam-item, .TiMu, .singleQuesId';

    function isNullPageDoc(doc) {
        try {
            const nullEl = doc.querySelector('.nullpage');
            if (!nullEl) return false;
            const txt = (nullEl.textContent || '').trim();
            return txt.includes('暂无内容');
        } catch {}
        return false;
    }

    function isLikelyQuestionContainer(el) {
        try {
            if (!el) return false;
            if (el.closest('.translationBox, .func-pop, .colorPop, .nullpage')) return false;

            if (el.id === 'fanyaMarking') return false;
            if (el.querySelector('.singleQuesId, .questionLi') && !el.classList.contains('singleQuesId') && !el.classList.contains('questionLi')) return false;
            if (el.querySelector('.stem_answer, .subject_describe, .questionContent, .subject_stem, .type_title, .subject_type, .stem_type, [id^="answertype"], .Zy_TItle, ul.Zy_ulTop')) return true;
            if (el.querySelector('input[type="radio"], input[type="checkbox"], textarea, [id^="answerEditor"], iframe[id^="ueditor_"], div[contenteditable="true"]')) return true;
            const t = (el.textContent || '').trim();
            if (/单选题|多选题|判断题|填空题|简答题|名词解释|论述题|计算题|完形填空|写作题|连线题|分录题/.test(t)) return true;
        } catch {}
        return false;
    }

    function isUtilityElement(el) {
        try {
            if (!el || !el.closest) return false;
            return !!el.closest('.translationBox, .func-pop, .colorPop, #markDiv, .code-tool-wrap');
        } catch {}
        return false;
    }

    function isVisibleElement(el) {
        try {
            if (!el) return false;
            const win = (el.ownerDocument && el.ownerDocument.defaultView) || window;
            const st = win.getComputedStyle ? win.getComputedStyle(el) : null;
            if (st && (st.display === 'none' || st.visibility === 'hidden')) return false;
            const r = el.getBoundingClientRect ? el.getBoundingClientRect() : null;
            return !!(r && r.width > 0 && r.height > 0);
        } catch {}
        return true;
    }

    function getInteractiveInputs(doc) {
        try {
            const list = Array.from(doc.querySelectorAll('input[type="radio"], input[type="checkbox"], textarea, select, input[type="text"], div[contenteditable="true"], [id^="answerEditor"], iframe[id^="ueditor_"]'));
            return list.filter(el => !isUtilityElement(el) && isVisibleElement(el));
        } catch {}
        return [];
    }

    function getQuestionContainers(doc) {
        try {
            if (!doc || isNullPageDoc(doc)) return [];
            const all = Array.from(doc.querySelectorAll(QUESTION_CONTAINER_SELECTOR));
            return all.filter(isLikelyQuestionContainer);
        } catch {}
        return [];
    }

    function isQuizReviewDoc(doc) {
        try {
            if (!doc) return false;
            const hasQuizShell = !!doc.querySelector('.newTestCon, #RightCon .newTestTitle, form[name="form1"]');
            if (!hasQuizShell) return false;
            const hasAnswerView = !!doc.querySelector('.newAnswerBx .myAnswer, .answerFont, .answerScore, .myAllAnswerBx');
            if (!hasAnswerView) return false;
            const hasEditable = !!doc.querySelector('input[type="radio"], input[type="checkbox"], textarea:not([readonly]), input[type="text"]:not([readonly]), [id^="answerEditor"], iframe[id^="ueditor_"], div[contenteditable="true"]');
            const hasSubmit = !!doc.querySelector('button[type="submit"], input[type="submit"], .submit-btn, [onclick*="submit"], .btnBlueSubmit');
            return !hasEditable && !hasSubmit;
        } catch {}
        return false;
    }

    function isQuizEffectivelyCompletedDoc(doc) {
        try {
            if (!doc) return false;
            if (isQuizReviewDoc(doc)) return true;

            const pageText = String((doc.body && (doc.body.innerText || doc.body.textContent)) || '').replace(/\s+/g, ' ').trim();
            if (/待批阅|已完成|已交|提交成功|成绩|得分|查看结果|答题结果|作答记录/.test(pageText)) {
                const hasSubmit = !!doc.querySelector('button[type="submit"], input[type="submit"], .submit-btn, [onclick*="submit"], .btnBlueSubmit');
                if (!hasSubmit) return true;
            }

            if (isQuizPageDoc(doc) && !hasUnansweredQuestions(doc)) {
                const hasSubmit = !!doc.querySelector('button[type="submit"], input[type="submit"], .submit-btn, [onclick*="submit"], .btnBlueSubmit');
                const hasEditable = !!doc.querySelector('input[type="radio"], input[type="checkbox"], textarea:not([readonly]), input[type="text"]:not([readonly]), [id^="answerEditor"], iframe[id^="ueditor_"], div[contenteditable="true"]');
                if (!hasSubmit || !hasEditable) return true;
            }
        } catch {}
        return false;
    }

    async function waitForQuestionsRenderAny(timeoutMs = 8000) {
        const end = Date.now() + timeoutMs;
        while (Date.now() < end) {
            let hit = null;
            forEachAllSameOriginDocs((doc) => {
                if (hit) return;
                try {
                    const qs = getQuestionContainers(doc);
                    if (qs && qs.length > 0) hit = doc;
                } catch {}
            });
            if (hit) return hit;
            await new Promise(r => setTimeout(r, 300));
        }
        return null;
    }


    function scheduleSkipChapter(delay) {
        if (pendingSkipTimeoutId) {
            clearTimeout(pendingSkipTimeoutId);
        }
        pendingSkipTimeoutId = setTimeout(function() {
            pendingSkipTimeoutId = null;
            if (isStudyingChapters) skipChapter();
        }, delay);
    }

    function skipChapter() {
        if (!isStudyingChapters) return;
        if (isSkippingChapter) return;
        if (Date.now() - lastChapterNavTs < 8000) { return; }
        addLog("跳过章节", 'info');
        isSkippingChapter = true;
        lastChapterNavTs = Date.now();
        processingBatch = false;
        arrayEchelon = [];
        autoSkipDone = false;
        stopProgressMonitor();
        blankSectionChecks = 0;
        lastBlankSectionUrl = '';
        var chapterNext = window.top.document.querySelector("#prevNextFocusNext");
        if (chapterNext) {
            chapterNext.click();
        } else {
            addLog("未找到 #prevNextFocusNext 元素", 'warning');
        }

        setTimeout(function() {
            try {
                var tip = document.querySelector(".maskDiv.jobFinishTip.maskFadeOut");
                if (tip) {
                    var tipNextChapter = document.querySelector(".jb_btn.jb_btn_92.fr.fs14.nextChapter");
                    if (tipNextChapter) {
                        tipNextChapter.click();
                    }
                }
            } catch(e) {
                addLog("未找到完成提示或下一章节按钮", 'warning');
            }
            isSkippingChapter = false;
        }, 6000);
    }


    function videoHandler(entry) {
        var idocument = entry.document;
        addLog("处理视频任务中...", 'info');
        var retries = 0;
        var maxRetries = 10;

        function tryFindVideo() {
            try {
                var video = idocument.querySelector("video");
                var videoPlayButton = idocument.querySelector(".vjs-big-play-button");
                var modalDialog = idocument.querySelector(".vjs-modal-dialog-content");
                var closeButton = idocument.querySelector(".vjs-done-button");

                if (!video || !videoPlayButton) {
                    var iframes = idocument.querySelectorAll("iframe");
                    for (var i = 0; i < iframes.length; i++) {
                        try {
                            var innerDoc = iframes[i].contentDocument || iframes[i].contentWindow.document;
                            video = innerDoc.querySelector("video");
                            videoPlayButton = innerDoc.querySelector(".vjs-big-play-button");
                            modalDialog = innerDoc.querySelector(".vjs-modal-dialog-content");
                            closeButton = innerDoc.querySelector(".vjs-done-button");
                            if (video && videoPlayButton) break;
                        } catch(e) {}
                    }
                }

                if (!video || !videoPlayButton) {
                    retries++;
                    if (retries < maxRetries) {
                        setTimeout(tryFindVideo, 2000);
                    } else {
                        addLog("没有找到视频或播放按钮", 'error');
                        setTimeout(function() { document.dispatchEvent(dealEvent); }, 3000);
                    }
                    return;
                }

                video.muted = true;
                if (!Number.isNaN(video.playbackRate)) video.playbackRate = currentPlaybackSpeed;

                var playVideo = function() {
                    if (video && typeof video.play === 'function') {
                        video.muted = true;
                        video.play().catch(function(error) {
                            videoPlayButton.click();
                        });
                    } else {
                        videoPlayButton.click();
                    }
                };

                var clickPlayVideo = function() {
                    if (videoPlayButton && typeof videoPlayButton.click === 'function') {
                        videoPlayButton.click();
                    } else {
                        video.muted = true;
                        video.play().catch(function() {
                            videoPlayButton.click();
                        });
                    }
                };

                var closeModalDialog = function() {
                    if (modalDialog && closeButton && modalDialog.getAttribute("aria-hidden") !== "true") {
                        setTimeout(function() { closeButton.click(); }, 2000);
                    }
                };

                var handlePause = function() {
                    if (video.ended) return;
                    clickPlayVideo();
                    closeModalDialog();
                };

                video.addEventListener("pause", handlePause);

                video.addEventListener("ended", function() {
                    addLog("视频任务已完成", 'success');
                    video.removeEventListener("pause", handlePause);
                    setTimeout(function() { document.dispatchEvent(dealEvent); }, 500);
                }, { once: true });

                setTimeout(function() {
                    if (video.paused && !video.ended) {
                        playVideo();
                    }
                }, 10000);

                playVideo();
            } catch(e) {
                retries++;
                if (retries < maxRetries) {
                    setTimeout(tryFindVideo, 2000);
                } else {
                    addLog('视频处理出错: ' + e.message, 'error');
                    setTimeout(function() { document.dispatchEvent(dealEvent); }, 2000);
                }
            }
        }

        tryFindVideo();
    }


    function handlePPTInDocument(doc) {
        try {
            const nextSelectors = ['.next', '.vc-next', '.reader-next', 'a[title="下一页"]', '.btn-next', '#next'];
            for (const sel of nextSelectors) {
                const btn = doc.querySelector(sel);
                if (btn && !btn.className.includes('disabled') && !btn.getAttribute('disabled')) {
                    if (safeClick(btn)) { return true; }
                }
            }

            return false;
        } catch { return false; }
    }


    function findChapterQuizTab(doc) {
        try {

            const byTitle = doc.querySelector('li[title*="章节测验"], li[title*="测验"], a[title*="章节测验"], a[title*="测验"]');
            if (byTitle) return byTitle;

            const byOnClick = Array.from(doc.querySelectorAll('li[onclick], a[onclick], button[onclick]')).find(el => {
                const oc = (el.getAttribute('onclick') || '').toString();
                return oc.includes('changeDisplayContent') && (oc.includes('(2,2') || oc.includes(',2)'));
            });
            if (byOnClick) return byOnClick;

            const candidates = Array.from(doc.querySelectorAll('li, a, button, [role="tab"], [role="option"]'));
            const textEl = candidates.find(el => /章节测验|测验/.test(((el.textContent || el.getAttribute('title') || '') + '').trim()));
            if (textEl) return textEl;
        } catch {}
        return null;
    }


    async function waitForQuestionsRender(doc, timeoutMs = 6000) {
        const end = Date.now() + timeoutMs;
        while (Date.now() < end) {
            try {
                const qs = getQuestionContainers(doc);
                if (qs.length > 0) return true;
            } catch {}
            await new Promise(r => setTimeout(r, 300));
        }
        return false;
    }



    let TYPR_MD5_LIB, FONT_TABLE_DATA;
    try {
        TYPR_MD5_LIB = GM_getResourceText('typrMd5Lib');
        FONT_TABLE_DATA = GM_getResourceText('fontTableData');


        if (TYPR_MD5_LIB) {
            window.TYPR_MD5_LIB = TYPR_MD5_LIB;
        }
        if (FONT_TABLE_DATA) {
            window.FONT_TABLE_DATA = FONT_TABLE_DATA;
        }
    } catch (e) {
        console.error('加载外部资源失败:', e);

        TYPR_MD5_LIB = '';
        FONT_TABLE_DATA = '{}';
    }


    function injectConsoleDecryptCode(doc, timeoutMs = 3000) {
        return new Promise((resolve) => {
            try {
                const consoleCode = `

if (!window.Typr || !window.md5) {
    ${TYPR_MD5_LIB || window.TYPR_MD5_LIB || ''}
}


if (!window.chaoXingFontTable) {
    window.chaoXingFontTable = ${FONT_TABLE_DATA || window.FONT_TABLE_DATA || '{}'};
}


const decryptChaoXingFont = async () => {
  const { Typr, md5, chaoXingFontTable: table } = window;


  const base64ToUint8Array = (base64) => {
    const data = atob(base64);
    const buffer = new Uint8Array(data.length);
    for (let i = 0; i < data.length; i++) {
      buffer[i] = data.charCodeAt(i);
    }
    return buffer;
  };


  const styleElements = [...document.querySelectorAll('style')];
  const cxStyle = styleElements.find(el =>
    el.textContent.includes('font-cxsecret')
  );

  if (!cxStyle) {
    return;
  }


  const fontData = cxStyle.textContent.match(/base64,([\\w\\W]+?)'/)[1];
  const parsedFont = Typr.parse(base64ToUint8Array(fontData))[0];


  const charMap = {};
  for (let charCode = 19968; charCode < 40870; charCode++) {
    const glyph = Typr.U.codeToGlyph(parsedFont, charCode);
    if (!glyph) continue;

    const path = Typr.U.glyphToPath(parsedFont, glyph);
    const pathHash = md5(JSON.stringify(path)).slice(24);
    charMap[String.fromCharCode(charCode)] =
      String.fromCharCode(table[pathHash]);
  }


  document.querySelectorAll('.font-cxsecret').forEach(element => {
    let htmlContent = element.innerHTML;
    Object.entries(charMap).forEach(([encryptedChar, decryptedChar]) => {
      const regex = new RegExp(encryptedChar, 'g');
      htmlContent = htmlContent.replace(regex, decryptedChar);
    });
    element.innerHTML = htmlContent;
    element.classList.remove('font-cxsecret');
  });
};


decryptChaoXingFont().catch(console.error);
`;
                const beforeCnt = (() => { try { return doc.querySelectorAll('.font-cxsecret').length; } catch { return -1; } })();

                let script = doc.createElement('script');
                script.type = 'text/javascript';
                let blobUrl = '';
                try {
                    const blob = new Blob([consoleCode], { type: 'text/javascript' });
                    blobUrl = (doc.defaultView || window).URL.createObjectURL(blob);
                    script.src = blobUrl;
                } catch {

                    script.textContent = consoleCode;
                }
                (doc.head || doc.documentElement).appendChild(script);
                script.onload = () => { try { if (blobUrl) (doc.defaultView || window).URL.revokeObjectURL(blobUrl); } catch {} };

                const start = Date.now();
                const timer = setInterval(() => {
                    try {
                        const cnt = doc.querySelectorAll('.font-cxsecret').length;
                        if (cnt === 0 || (beforeCnt >= 0 && cnt < beforeCnt)) { clearInterval(timer); resolve(); return; }
                    } catch {}
                    if (Date.now() - start > timeoutMs) { clearInterval(timer); resolve(); }
                }, 200);
            } catch { resolve(); }
        });
    }


    async function tryEnterQuizAndAnswer(contextDoc) {
        try {
            if (!isStudyingChapters) return false;
            if (isChapterQuizEnteringForCurrentSection()) return true;
            let targetDoc = null;
            let tabEl = null;

            forEachAllSameOriginDocs((doc) => {
                if (tabEl) return;
                const el = findChapterQuizTab(doc);
                if (el) { tabEl = el; targetDoc = doc; }
            });
            if (!tabEl || !targetDoc) return false;
            addLog('正在进入章节测验...', 'info');
            markChapterQuizEnteringForCurrentSection(12000);

            await new Promise((r) => {
                let pending = 0; let done = false;
                forEachAllSameOriginDocs((doc) => {
                    pending++; injectConsoleDecryptCode(doc).finally(() => { if (--pending === 0 && !done) { done = true; r(); } });
                });
                if (pending === 0) r();
            });

            safeClick(tabEl);

            const qDoc = await waitForQuestionsRenderAny(4000);
            if (!isStudyingChapters) return false;
            if (!qDoc) {
                clearChapterQuizEnteringForCurrentSection();
                markChapterQuizHandledForCurrentSection();
                addLog('章节测验未检测到题目', 'warning');
                return false;
            }

            clearChapterQuizEnteringForCurrentSection();
            await injectConsoleDecryptCode(qDoc);

            if (!isStudyingChapters) return false;
            await autoAnswerInDocument(qDoc);
            addLog('章节测验已完成', 'success');
            markChapterQuizHandledForCurrentSection();
            return true;
        } catch (e) {
            clearChapterQuizEnteringForCurrentSection();
            addLog(`进入章节测验失败: ${e.message}`, 'error');
            return false;
        }
    }


    function hasActionableStudyContent(doc) {
        try {
            if (isNullPageDoc(doc)) return false;
            if (isQuizReviewDoc(doc)) return false;


            if (isQuizPageDoc(doc)) return true;
            if (doc.querySelector('#form1, .newTestCon, .TiMu, .singleQuesId, [id^="answertype"], .Zy_TItle, ul.Zy_ulTop')) return true;

            if (doc.querySelector('video, .video-js video')) return true;


            const docSelectors = [
                '.ans-attach-ct', '.reader', '.ppt', '.ppt-play', '.vjs-control', '.vjs-big-play-button'
            ];
            if (docSelectors.some(sel => !!doc.querySelector(sel))) return true;

            if (getQuestionContainers(doc).length > 0) return true;


            if (getInteractiveInputs(doc).length > 0) return true;


            const iframes = Array.from(doc.querySelectorAll('iframe'));
            if (iframes.some(f => {
                const src = (f.getAttribute('src') || '').toLowerCase();
                return src.includes('mooc-ans') || src.includes('document') || src.includes('ppt') || src.includes('video') || src.includes('knowledgeid');
            })) return true;
        } catch {}
        return false;
    }


    function hasUnansweredQuestions(doc) {
        try {
            if (isNullPageDoc(doc)) return false;
            if (isQuizReviewDoc(doc)) return false;

            const containers = getQuestionContainers(doc);
            for (const q of containers) {
                try { if (!isQuestionAnswered(q)) return true; } catch {}
            }


            const radios = getInteractiveInputs(doc).filter(el => el.tagName && el.tagName.toLowerCase() === 'input' && el.type === 'radio');
            if (radios.length > 0) {
                const groups = new Map();
                radios.forEach(r => {
                    const k = r.name || `__radio_${Math.random()}`;
                    if (!groups.has(k)) groups.set(k, []);
                    groups.get(k).push(r);
                });
                for (const [, list] of groups) {
                    if (!list.some(r => r.checked)) return true;
                }
            }


            const texts = getInteractiveInputs(doc).filter(el => {
                const tag = (el.tagName || '').toLowerCase();
                return tag === 'textarea' || (tag === 'input' && el.type === 'text') || (tag === 'div' && el.getAttribute('contenteditable') === 'true');
            });
            if (texts.length > 0) {
                if (texts.some(el => {
                    if (el.tagName && el.tagName.toLowerCase() === 'div') return ((el.innerText || el.textContent || '').trim().length === 0);
                    return ((el.value || '').trim().length === 0);
                })) return true;
            }


            if (doc.querySelector('[id^="answertype"], .TiMu, .singleQuesId, .Zy_TItle, ul.Zy_ulTop')) return !isQuizReviewDoc(doc);
        } catch {}
        return false;
    }


    function getDocPathname(doc) {
        try {
            return new URL(doc.location.href).pathname || '';
        } catch {}
        return '';
    }

    function getQueryParamFromUrl(url, key) {
        try {
            return new URL(String(url || ''), location.origin).searchParams.get(key) || '';
        } catch {}
        return '';
    }

    function buildSectionKeyFromUrl(url) {
        const chapterId = getQueryParamFromUrl(url, 'chapterId');
        const knowledgeId = getQueryParamFromUrl(url, 'knowledgeId') || getQueryParamFromUrl(url, 'knowledgeid');
        if (!chapterId && !knowledgeId) return '';
        return `chapter:${chapterId || ''}|knowledge:${knowledgeId || ''}`;
    }

    function getCurrentStudySectionKey() {
        const urls = [];
        try { urls.push(window.top.location.href); } catch {}
        try { urls.push(window.location.href); } catch {}
        forEachAllSameOriginDocs((doc) => {
            try { urls.push(doc.location.href); } catch {}
        });
        for (const url of urls) {
            const key = buildSectionKeyFromUrl(url);
            if (key) return key;
        }
        return '';
    }

    function markChapterQuizHandledForCurrentSection() {
        const key = currentStudySectionKey || getCurrentStudySectionKey();
        if (!key) return;
        chapterQuizHandledSectionKey = key;
        chapterQuizEnteringSectionKey = '';
        chapterQuizEnterRetryAt = 0;
    }

    function isChapterQuizHandledForCurrentSection() {
        const key = currentStudySectionKey || getCurrentStudySectionKey();
        if (!key) return false;
        return chapterQuizHandledSectionKey === key;
    }

    function markChapterQuizEnteringForCurrentSection(waitMs = 12000) {
        const key = currentStudySectionKey || getCurrentStudySectionKey();
        if (!key) return;
        chapterQuizEnteringSectionKey = key;
        chapterQuizEnterRetryAt = Date.now() + waitMs;
    }

    function clearChapterQuizEnteringForCurrentSection() {
        chapterQuizEnteringSectionKey = '';
        chapterQuizEnterRetryAt = 0;
    }

    function isChapterQuizEnteringForCurrentSection() {
        const key = currentStudySectionKey || getCurrentStudySectionKey();
        if (!key) return false;
        if (chapterQuizEnteringSectionKey !== key) return false;
        if (Date.now() >= chapterQuizEnterRetryAt) {
            clearChapterQuizEnteringForCurrentSection();
            return false;
        }
        return true;
    }

    function findNestedDoc(root, predicate, depth = 0) {
        if (!root || depth > 4) return null;
        try {
            if (predicate(root)) return root;
        } catch {}
        try {
            const iframes = Array.from(root.querySelectorAll('iframe'));
            for (const iframe of iframes) {
                try {
                    const nextDoc = iframe.contentDocument || iframe.contentWindow?.document;
                    const result = findNestedDoc(nextDoc, predicate, depth + 1);
                    if (result) return result;
                } catch {}
            }
        } catch {}
        return null;
    }

    function handlePPTInDocument(doc) {
        try {
            const nextSelectors = ['.next', '.vc-next', '.reader-next', 'a[title="下一页"]', '.btn-next', '#next'];
            for (const sel of nextSelectors) {
                const btn = doc.querySelector(sel);
                if (btn && !btn.className.includes('disabled') && !btn.getAttribute('disabled')) {
                    if (safeClick(btn)) { return true; }
                }
            }
            return false;
        } catch { return false; }
    }

    var arrayEchelon = [];
    var completedJobCache = new Set();
    var studyPageDefaults = null;
    var studyPageTasks = null;
    var dealEvent = new Event("redeal", { bubbles: false, cancelable: false });
    var testDom = null;
    var ifTest = 'take';
    var testType = 'submit';
    var taskInterval = 6000;
    var isMainInstance = false;
    var autoSkipDone = false;
    var progressMonitor = null;

    function getReaderMissionApiPaths(mission) {
        const type = String((mission && mission.type) || '').toLowerCase();
        if (type === 'ppt' || type === 'pdf' || type === 'reader') {
            return ['/ananas/job/document', '/ananas/job/readv2', '/ananas/job'];
        }
        return ['/ananas/job/document'];
    }

    async function handleQuizTest(doc) {
        try {
            if (!doc) return;
            await injectConsoleDecryptCode(doc);
            if (isQuizEffectivelyCompletedDoc(doc)) {
                addLog('章节测验已处于完成状态', 'success');
                return;
            }
            const handled = await autoAnswerQuizInDocument(doc);
            if (handled) {
                addLog('章节测验已完成', 'success');
            }
        } catch (e) {
            addLog(`章节答题出错: ${e.message}`, 'error');
        }
    }


    async function autoAnswerInDocument(rootDoc) {
        try {
            if (!isStudyingChapters) return false;

            if (isQuizPageDoc(rootDoc)) {
                if (!isStudyingChapters) return false;
                const ok = await autoAnswerQuizInDocument(rootDoc);
                if (ok) return true;
            }

            const questions = getQuestionContainers(rootDoc);
            if (questions.length === 0) return false;
            addLog(`章节内发现 ${questions.length} 个题目，自动作答...`, 'info');
            for (let q of questions) {
                if (!isStudyingChapters) return false;
                const info = getQuestionInfo(q);
                if (!info || !info.question) continue;
                const ans = await getAnswer(info);
                if (ans) {
                    fillAnswer(ans, q, info.type);
                    await new Promise(r => setTimeout(r, 1000));
                }
            }
            return true;
        } catch (e) { addLog(`章节答题出错: ${e.message}`, 'error'); return false; }
    }


    function isStudyPage() { return /mycourse\/studentstudy|mooc2-ans|knowledgeId|chapterId/.test(location.href); }


    
    function isStudyContentDoc(doc) {
        try {
            if (!doc) return false;
            var path = String((doc.location && doc.location.pathname) || '');
            if (path.indexOf('/knowledge/cards') !== -1 || path.indexOf('/knowledge/start') !== -1) return true;
            if (doc.querySelector && doc.querySelector('.ans-attach-ct, .ans-job-ct, .ans-job-icon')) return true;
        } catch (e) {}
        return false;
    }

    
    function docHasTaskFrames(doc) {
        try {
            if (!doc) return false;
            var iframes = doc.querySelectorAll('iframe');
            for (var i = 0; i < iframes.length; i++) {
                var f = iframes[i];
                if (f.getAttribute('data')) return true;
                var src = f.getAttribute('src') || '';
                if (!src || src.indexOf('javascript:') === 0) continue;
                if (/api\/work|modules\/(video|audio|ppt|doc|pptx|docx|pdf|innerbook)|video|audio|\.mp4/.test(src)) return true;
            }
        } catch (e) {}
        return false;
    }


    // ================= 兜底方案：新版章节页 iframe 识别 =================
    // 参考同类脚本做法：不依赖 /knowledge/cards，直接扫描同源嵌套 iframe，
    // 用 iframe 的 src / data 判断任务类型，再交给现有处理器执行。
    function isTaskIframeFinished(iframe, cdoc, src) {
        try {
            var el = iframe.parentElement;
            while (el) {
                if (el.classList && el.classList.contains('ans-job-finished')) return true;
                el = el.parentElement;
            }
        } catch(e) {}
        try {
            var icon = iframe.closest('.ans-job-icon') || (iframe.parentElement && iframe.parentElement.querySelector('.ans-job-icon'));
            if (icon && String(icon.getAttribute('aria-label') || '').indexOf('已完成') !== -1) return true;
        } catch(e) {}
        try {
            if (src && src.indexOf('api/work') !== -1) {
                var txt = (cdoc.documentElement && cdoc.documentElement.innerText) || '';
                if (txt.indexOf('已完成') !== -1 || txt.indexOf('待批阅') !== -1) return true;
            }
        } catch(e) {}
        return false;
    }

    function classifyTaskIframe(iframe, src) {
        if (!src || src.indexOf('javascript:') === 0) return null;
        if (src.indexOf('api/work') !== -1 || /\/(work|mooc2\/work)\/(doTest|index|calcAnswer)/.test(src)) return 'workA';
        if (src.indexOf('modules/video') !== -1 || /\/video\//.test(src) || /\.mp4(\?|$)/.test(src)) return '.mp4';
        if (src.indexOf('modules/audio') !== -1 || /\.(mp3|wav)(\?|$)/.test(src)) return '.mp3';
        if (/modules\/(ppt|pptx|doc|docx|pdf|innerbook)/.test(src) || /\.(pdf|ppt|pptx|doc|docx)(\?|$)/.test(src)) return '.pdf';
        var dataStr = iframe.getAttribute('data');
        if (dataStr) {
            try {
                var d = JSON.parse(dataStr);
                var t = String(d.type || d.worktype || d.resourceType || '');
                if (t) {
                    if (/mp4|video/i.test(t)) return '.mp4';
                    if (/mp3|audio/i.test(t)) return '.mp3';
                    if (/pdf|ppt|doc|book/i.test(t)) return '.pdf';
                    if (/work|exam|test|quiz|homework/i.test(t)) return 'workA';
                }
            } catch(e) {}
        }
        return null;
    }

    // 深度扫描同源嵌套 iframe，返回 { pending: [...], total: 任务点总数 }
    function collectTasksFromIframes(rootDoc) {
        var pending = [];
        var total = 0;
        var seen = new Set();
        var visit = function(d) {
            if (!d || seen.has(d)) return;
            seen.add(d);
            var iframes = [];
            try { iframes = d.querySelectorAll('iframe'); } catch(e) { return; }
            for (var i = 0; i < iframes.length; i++) {
                var f = iframes[i];
                var cdoc = null;
                try { cdoc = f.contentDocument; } catch(e) { cdoc = null; }
                if (!cdoc) continue;
                var src = f.getAttribute('src') || f.src || '';
                var type = classifyTaskIframe(f, src);
                if (!type) { visit(cdoc); continue; }
                total++;
                if (isTaskIframeFinished(f, cdoc, src)) continue;
                var dataStr = f.getAttribute('data');
                if (dataStr) {
                    try {
                        var dj = JSON.parse(dataStr);
                        var jobid = dj.jobid || (dj.property && dj.property.jobid) || '';
                        if (jobid && completedJobCache.has(jobid)) continue;
                    } catch(e) {}
                }
                pending.push({ doc: cdoc, dataStr: dataStr, type: type });
            }
        };
        visit(rootDoc);
        return { pending: pending, total: total };
    }


    // ============ 跨域刷章节接力（GM 存储，跨 frame / 跨子域共享） ============
    const STUDY_SESSION_KEY = 'cx_study_session';
    const STUDY_ADOPT_KEY = 'cx_study_adopted_ts';
    const STUDY_SESSION_TTL = 15000;
    var studySessionInitiator = false;
    var lastAdoptNotifiedTs = 0;

    function gmStoreGet(key, def) {
        try { if (typeof GM_getValue === 'function') return GM_getValue(key, def); } catch(e) {}
        try {
            var raw = localStorage.getItem('cx_gm_' + key);
            return raw == null ? def : JSON.parse(raw);
        } catch(e) {}
        return def;
    }
    function gmStoreSet(key, val) {
        try { if (typeof GM_setValue === 'function') { GM_setValue(key, val); return; } } catch(e) {}
        try { localStorage.setItem('cx_gm_' + key, JSON.stringify(val)); } catch(e) {}
    }
    function publishStudySession(running) {
        gmStoreSet(STUDY_SESSION_KEY, { running: !!running, ts: Date.now() });
    }
    function readStudySession() {
        var s = gmStoreGet(STUDY_SESSION_KEY, null);
        if (!s) return null;
        if (typeof s === 'string') { try { s = JSON.parse(s); } catch(e) { return null; } }
        return s;
    }
    function isStudySessionActive() {
        var s = readStudySession();
        if (!s || !s.running) return false;
        return (Date.now() - (Number(s.ts) || 0)) <= STUDY_SESSION_TTL;
    }

    // 本帧能否访问顶层文档：能=同源（交给外层处理），不能=跨域（需要本帧接管）
    function isFrameSameOriginWithTop() {
        try { return !!(window.top && window.top.document); } catch(e) { return false; }
    }

    // 跨域接力：某个 frame 自己就是任务内容帧时，由它接管刷章节
    function tryAdoptStudySession() {
        if (isStudyingChapters) return;
        if (studySessionInitiator) return;
        if (!isStudySessionActive()) return;
        if (isFrameSameOriginWithTop()) return;
        var scanned = collectTasksFromIframes(document);
        if (scanned.total === 0) return;
        gmStoreSet(STUDY_ADOPT_KEY, Date.now());
        addLog('检测到内容帧跨域，由本帧接管刷章节', 'info');
        try { startStudyChapters(); } catch(e) {}
    }
    // ====================================================================


    function hasStudyContentDeep() {
        let found = false;
        const tryDoc = (doc) => {
            try {
                if (doc.querySelector('video, .video-js, .ans-attach-ct, .reader, .ppt, .ppt-play, .catalog, .vjs-play-control')) { found = true; return; }
                if (getQuestionContainers(doc).length > 0) { found = true; return; }
            } catch {}
        };
        forEachSameOriginFrame(tryDoc);
        return found;
    }



    let currentPlaybackSpeed = 1.0;
    const PLAYBACK_SPEED_KEY = 'cx_playback_speed';
    const LS_KEY_ANSWERING_STATE = 'cx_answering_state';

    function saveAnsweringState() {
        try {
            const state = {
                active: true,
                startTime: Date.now()
            };
            localStorage.setItem(LS_KEY_ANSWERING_STATE, JSON.stringify(state));


            setTimeout(() => {
                clearAnsweringState();
            }, 15 * 1000);
        } catch {}
    }

    function clearAnsweringState() {
        try {
            localStorage.removeItem(LS_KEY_ANSWERING_STATE);
        } catch {}
    }

    function getAnsweringState() {
        try {
            const raw = localStorage.getItem(LS_KEY_ANSWERING_STATE);
            if (!raw) return null;
            const state = JSON.parse(raw);
            if (!state.active) return null;
            const elapsed = Date.now() - state.startTime;
            if (elapsed > 15 * 1000) {
                clearAnsweringState();
                return null;
            }
            return state;
        } catch {
            return null;
        }
    }


    try {
        const savedSpeed = localStorage.getItem(PLAYBACK_SPEED_KEY);
        if (savedSpeed) {
            currentPlaybackSpeed = parseFloat(savedSpeed);
        }
    } catch {}


    function updateSpeedButtonsState() {
        const speedButtons = document.querySelectorAll('.speed-button');
        speedButtons.forEach(btn => {
            btn.classList.remove('speed-active');
        });

        const activeButton = document.getElementById(`speed-${currentPlaybackSpeed}x`);
        if (activeButton) {
            activeButton.classList.add('speed-active');
        }
    }


    function setVideoPlaybackSpeed(speed) {
        currentPlaybackSpeed = speed;
        try {
            localStorage.setItem(PLAYBACK_SPEED_KEY, speed.toString());
        } catch {}

        updateSpeedButtonsState();


        forEachSameOriginFrame((doc) => {
            try {
                const videos = doc.querySelectorAll('video, .video-js video');
                videos.forEach(v => {
                    if (!Number.isNaN(v.playbackRate)) v.playbackRate = speed;
                });
            } catch {}
        });

        addLog(`视频播放速度已设置为 ${speed}×`, 'success');
    }

    function updateStudyButtons(running) {
        const startBtn = document.getElementById('start-study');
        const pauseBtn = document.getElementById('pause-study');
        const speedControls = document.getElementById('playback-speed-controls');

        if (!startBtn || !pauseBtn) return;

        if (running) {
            startBtn.style.display = 'none';
            pauseBtn.style.display = 'flex';
            if (speedControls) speedControls.style.display = 'flex';
        } else {
            startBtn.style.display = 'flex';
            pauseBtn.style.display = 'none';
            if (speedControls) speedControls.style.display = 'none';
        }
    }

    function initAllInDoc(targetDoc) {
        if (!isStudyingChapters) return;
        autoSkipDone = false;
        isMainInstance = true;
        addLog('正在加载当前页面的任务...', 'info');

        var rawPayload = extractStudyPayloadFromPage(targetDoc);
        if (rawPayload && rawPayload.defaults) {
            studyPageDefaults = rawPayload.defaults;
        }
        if (rawPayload && Array.isArray(rawPayload.attachments)) {
            studyPageTasks = rawPayload.attachments;
        }

        var arrayAns = targetDoc.querySelectorAll(".ans-attach-ct");
        if (arrayAns.length === 0) {
            arrayAns = targetDoc.querySelectorAll(".ans-job-ct");
        }
        if (arrayAns.length === 0) {
            arrayAns = targetDoc.querySelectorAll(".chapter-item");
        }
        if (arrayAns.length === 0) {
            arrayAns = targetDoc.querySelectorAll('[class*="ans"], [class*="task"], [class*="chapter"]');
        }

        addLog(`当前页面任务数量为: ${arrayAns.length}`, 'info');

        var filteredArrayAns = targetDoc.querySelectorAll('.ans-attach-ct:not(.ans-job-finished), .ans-job-ct:not(.ans-job-finished)');

        var taskCount = filteredArrayAns.length;
        if (taskCount > 0) {
            try {
                var arrayType = getIframesType(filteredArrayAns);
                var arrayDocument = getAllIframesDocument(filteredArrayAns);
                arrayEchelon = distributeAns(arrayType, arrayDocument);
                if (completedJobCache.size > 0) {
                    var before = arrayEchelon.length;
                    arrayEchelon = arrayEchelon.filter(function(item) {
                        if (!item.dataStr) return true;
                        try {
                            var d = JSON.parse(item.dataStr);
                            var jobid = d.jobid || (d.property && d.property.jobid) || '';
                            return !completedJobCache.has(jobid);
                        } catch(e) { return true; }
                    });
                    if (arrayEchelon.length < before) {
                        addLog('已过滤 ' + (before - arrayEchelon.length) + ' 个缓存中已完成的任务', 'info');
                    }
                }

                startProgressMonitor();
                document.dispatchEvent(dealEvent);
            } catch (error) {
                addLog('初始化过程中发生错误: ' + error, 'error');
            }
        } else {
            addLog('当前页面没有可处理的任务，等待确认', 'info');
            var retryKey = 'cx_retry_' + (targetDoc.location ? targetDoc.location.href : '');
            if (!targetDoc[retryKey]) {
                targetDoc[retryKey] = true;
                setTimeout(function() {
                    targetDoc[retryKey] = false;
                    var retryTasks = targetDoc.querySelectorAll('.ans-attach-ct:not(.ans-job-finished), .ans-job-ct:not(.ans-job-finished)');
                    if (retryTasks.length > 0) {
                        initAllInDoc(targetDoc);
                        return;
                    }
                    addLog('确认无待处理任务，跳过章节', 'info');
                    scheduleSkipChapter(3000);
                }, 4000);
            }
        }
    }

    var studyObserver = null;
    var lastChapterNavTs = 0;
    var lastLoadingLogTs = 0;
    var processingBatch = false;
    var isSkippingChapter = false;
    var pendingSkipTimeoutId = null;

    var initRetryCount = 0;
    var blankSectionChecks = 0;
    var lastBlankSectionUrl = '';

    function startStudyChapters() {
        if (isStudyingChapters) { addLog('刷章节已在运行', 'info'); return; }
        isStudyingChapters = true;
        setPanelFixedHeight(360);
        updateStudyButtons(true);
        addLog('正在初始化中', 'info');
        initRetryCount = 0;

        setTimeout(function() {
            if (!isStudyingChapters) return;
            addLog('开始刷章节...', 'success');

        function findCardsDoc() {
            var cd = null;
            forEachSameOriginFrame(function(doc) {
                if (cd) return;
                try {
                    if (isStudyContentDoc(doc)) {
                        cd = doc;
                    }
                } catch(e) {}
            });
            if (!cd && isStudyContentDoc(document)) {
                cd = document;
            }
            return cd;
        }

        // 兜底入口：原逻辑找不到学习页 / 识别不到 .ans-* 容器时才走这里
        // （扫描函数 isTaskIframeFinished / classifyTaskIframe / collectTasksFromIframes 定义在脚本外层）
        function tryIframeFallback() {
            if (processingBatch) return false;
            if (arrayEchelon.length > 0 && isMainInstance) return false;
            if (Date.now() - lastChapterNavTs < 5000) return false;
            var scanned = collectTasksFromIframes(document);
            if (scanned.total === 0) return false;
            if (scanned.pending.length === 0) {
                if (!autoSkipDone) {
                    autoSkipDone = true;
                    addLog('检测到章节任务均已完成，准备跳转', 'info');
                    scheduleSkipChapter(2000);
                }
                return true;
            }
            isMainInstance = true;
            autoSkipDone = false;
            processingBatch = true;
            arrayEchelon = distributeAns(
                scanned.pending.map(function(t) { return t.type; }),
                scanned.pending.map(function(t) { return { doc: t.doc, dataStr: t.dataStr }; })
            );
            addLog('兼容模式：识别到 ' + arrayEchelon.length + ' 个任务点', 'info');
            startProgressMonitor();
            setTimeout(function() { document.dispatchEvent(dealEvent); }, 0);
            return true;
        }
        // ================================================================

        function checkAndInit(cardsDoc) {
            if (!cardsDoc) return false;
            if (processingBatch) return false;
            if (Date.now() - lastChapterNavTs < 5000) { if (Date.now() - lastLoadingLogTs > 8000) { lastLoadingLogTs = Date.now(); addLog('页面内容加载中，请稍等', 'info'); } return false; }

            var unfinished = cardsDoc.querySelectorAll('.ans-attach-ct:not(.ans-job-finished), .ans-job-ct:not(.ans-job-finished)');
            if (unfinished.length === 0) {
                var anyExists = cardsDoc.querySelectorAll('.ans-attach-ct, .ans-job-ct, .chapter-item').length;
                if (anyExists > 0) {
                    blankSectionChecks = 0;
                    lastBlankSectionUrl = '';
                    addLog('检测到章节任务均已完成，准备跳转', 'info');
                    scheduleSkipChapter(2000);
                    return false;
                }

                
                if (docHasTaskFrames(cardsDoc)) {
                    if (tryIframeFallback()) return true;
                    if (Date.now() - lastLoadingLogTs > 8000) {
                        lastLoadingLogTs = Date.now();
                        addLog('已定位到任务点，正在等待任务信息加载完成...', 'info');
                    }
                    return false;
                }

                var currentUrl = (cardsDoc.location ? cardsDoc.location.href : '') || location.href;
                if (currentUrl !== lastBlankSectionUrl) {
                    blankSectionChecks = 0;
                    lastBlankSectionUrl = currentUrl;
                }
                blankSectionChecks++;
                if (blankSectionChecks >= 2) {
                    blankSectionChecks = 0;
                    addLog('检测到空白小节，自动跳过', 'info');
                    scheduleSkipChapter(500);
                } else {
                    addLog('检测到空白小节，等待确认', 'info');
                }
                return false;
            }

            blankSectionChecks = 0;
            lastBlankSectionUrl = '';
            processingBatch = true;
            addLog('发现 ' + unfinished.length + ' 个待处理任务', 'info');
            initAllInDoc(cardsDoc);
            return true;
        }

        function setupObserver(cardsDoc) {
            if (!cardsDoc) return;
            try { if (studyObserver) studyObserver.disconnect(); } catch(e) {}
            var target = cardsDoc.querySelector('.wrap, .ans-cc, #coursetest, [class*="catalog"]') || cardsDoc.body || cardsDoc.documentElement;
            if (!target) return;
            try {
                studyObserver = new MutationObserver(function() {
                    if (!isStudyingChapters || processingBatch) return;
                    if (Date.now() - lastChapterNavTs < 5000) { if (Date.now() - lastLoadingLogTs > 8000) { lastLoadingLogTs = Date.now(); addLog('页面内容加载中，请稍等', 'info'); } return; }
                    var cd = findCardsDoc();
                    if (!cd) return;
                    var freshTasks = cd.querySelectorAll('.ans-attach-ct:not(.ans-job-finished), .ans-job-ct:not(.ans-job-finished)');
                    if (freshTasks.length > 0 && arrayEchelon.length === 0) {
                        addLog('检测到章节内容变化，重新加载任务', 'info');
                        checkAndInit(cd);
                    }
                });
                studyObserver.observe(target, { childList: true, subtree: true });
            } catch(e) {}
        }

        var initialCardsDoc = findCardsDoc();
        if (initialCardsDoc) {
            addLog('正在检测任务', 'info');
            setupObserver(initialCardsDoc);
            checkAndInit(initialCardsDoc);
        } else if (!tryIframeFallback()) {
            addLog('正在定位学习页面...', 'info');
        }

        if (studyIntervalId) clearInterval(studyIntervalId);
        studyIntervalId = setInterval(function() {
            if (!isStudyingChapters) {
                clearInterval(studyIntervalId);
                studyIntervalId = null;
                return;
            }
            // 跨域接力：发起帧持续续期；接管帧发现会话结束后自动停止
            if (studySessionInitiator) {
                publishStudySession(true);
            } else if (!isStudySessionActive()) {
                addLog('刷章节会话已结束，停止接管', 'info');
                stopStudyChapters();
                return;
            }
            if (processingBatch) return;
            if (Date.now() - lastChapterNavTs < 5000) { if (Date.now() - lastLoadingLogTs > 8000) { lastLoadingLogTs = Date.now(); addLog('页面内容加载中，请稍等', 'info'); } return; }

            if (arrayEchelon.length > 0 && isMainInstance) {
                return;
            }

            var cardsDoc = findCardsDoc();
            if (!cardsDoc) {
                if (tryIframeFallback()) {
                    initRetryCount = 0;
                    return;
                }
                // 跨域时由内容帧接管，本帧只提示一次，不再刷“等待学习页面”
                var adoptTs = Number(gmStoreGet(STUDY_ADOPT_KEY, 0)) || 0;
                if (adoptTs > 0 && adoptTs !== lastAdoptNotifiedTs && (Date.now() - adoptTs) <= STUDY_SESSION_TTL) {
                    lastAdoptNotifiedTs = adoptTs;
                    initRetryCount = 0;
                    addLog('已由内容帧接管，刷章节进行中...', 'info');
                    return;
                }
                initRetryCount++;
                if (initRetryCount === 3) {
                    addLog('正在等待学习页面加载完成...', 'info');
                }
                if (initRetryCount % 10 === 0) {
                    addLog('仍在等待学习页面，请确认在课程章节页面中', 'warning');
                }
                return;
            }

            initRetryCount = 0;
            setupObserver(cardsDoc);
            checkAndInit(cardsDoc);
        }, 3000);
        }, 3000);
    }

    function stopStudyChapters() {
        if (!isStudyingChapters) return;
        isStudyingChapters = false;
        // 发起帧结束时通知其他 frame 停止接力
        if (studySessionInitiator) {
            studySessionInitiator = false;
            publishStudySession(false);
        }
        isMainInstance = false;
        processingBatch = false;
        isSkippingChapter = false;
        if (pendingSkipTimeoutId) { clearTimeout(pendingSkipTimeoutId); pendingSkipTimeoutId = null; }
        autoSkipDone = false;
        arrayEchelon = [];
        completedJobCache.clear();
        studyPageDefaults = null;
        studyPageTasks = null;
        setPanelFixedHeight(320);
        if (studyIntervalId) { clearInterval(studyIntervalId); studyIntervalId = null; }
        try { if (studyObserver) { studyObserver.disconnect(); studyObserver = null; } } catch(e) {}

        forEachSameOriginFrame((doc) => {
            try {
                doc.querySelectorAll('video, .video-js video').forEach(v => {
                    try { v.pause(); } catch {}
                });
            } catch {}
        });
        updateStudyButtons(false);
        addLog('已暂停刷章节', 'info');
    }

    function getIframesType(arrayAns) {
        return Array.from(arrayAns).map(function(ans) {
            const iframe = ans.querySelector("iframe");
            const jsonStr = iframe ? iframe.getAttribute("data") : null;
            let type = null;

            if (!jsonStr) {
                const src = iframe ? iframe.getAttribute("src") : null;
                if (src) {
                    if (src.includes('work') || src.includes('exam') || src.includes('test') || src.includes('quiz') || src.includes('homework')) {
                        type = "workA";
                    } else if (src.includes('video') || src.includes('.mp4')) {
                        type = ".mp4";
                    } else if (src.includes('.pdf') || src.includes('.ppt')) {
                        type = ".pdf";
                    }
                }
            } else {
                try {
                    const json = JSON.parse(jsonStr);
                    if (json && json.type) {
                        type = json.type;
                    } else if (json && json.worktype) {
                        type = json.worktype;
                    } else if (json && json.resourceType) {
                        type = json.resourceType;
                    }
                } catch (error) {}
            }

            if (!type) {
                const className = ans.className || '';
                if (className.includes('work') || className.includes('exam') || className.includes('test')) {
                    type = "workA";
                }
            }
            return type;
        }).filter(function(type) { return type !== null; });
    }

    function getAllIframesDocument(arrayAns) {
        return Array.from(arrayAns).map(function(ans) {
            var iframe = ans.querySelector('iframe');
            var idoc = iframe ? (iframe.contentWindow ? iframe.contentWindow.document : null) : null;
            var dataStr = iframe ? iframe.getAttribute('data') : null;
            return { doc: idoc, dataStr: dataStr };
        }).filter(function(item) { return item !== undefined && item !== null; });
    }

    const handlerMap = {
        ".mp4": videoHandler,
        ".wmv": videoHandler,
        ".avi": videoHandler,
        ".mkv": videoHandler,
        ".flv": videoHandler,
        ".mov": videoHandler,
        ".doc": pptxHandler,
        ".docx": pptxHandler,
        ".pptx": pptxHandler,
        ".pdf": pptxHandler,
        ".ppt": pptxHandler,
        ".mp3": audioHandler,
        ".wav": audioHandler,
        "workA": testHandler,
        "workB": testHandler,
        "workC": testHandler,
        "workD": testHandler,
        "homework": testHandler,
        "exam": testHandler,
        "test": testHandler,
        "quiz": testHandler
    };

    function distributeAns(arrayType, arrayItems) {
        return arrayType.map(function(type, index) {
            var handler = handlerMap[type] || ignoreAns;
            return { document: arrayItems[index].doc, handler: handler, type: type, dataStr: arrayItems[index].dataStr };
        });
    }

    function dealSingleAns(singleAns) {
        if (!isStudyingChapters) { processingBatch = false; return; }
        if (singleAns && singleAns.handler && typeof singleAns.handler === 'function') {
            singleAns.handler(singleAns);
        } else {
            document.dispatchEvent(dealEvent);
        }
    }

    function dealAnsEchelon(echelonArray) {
        if (!isStudyingChapters) { processingBatch = false; return; }
        var remainingTasks = echelonArray.length;
        if (remainingTasks === 0) {
            stopProgressMonitor();
            processingBatch = false;
            addLog('该章节任务已处理完成，即将跳转下一章节', 'success');
            scheduleSkipChapter(3000);
            return;
        }
        processingBatch = true;
        var nextTask = echelonArray.shift();
        try {
            dealSingleAns(nextTask);
        } catch (error) {
            addLog('处理任务时发生错误，继续处理下一个', 'error');
            dealAnsEchelon(echelonArray);
        }
    }

    function testHandler(entry) {
        var idocument = entry.document;
        addLog("处理章节测试任务中...", 'info');

        if (ifTest == 'skip') {
            setTimeout(function() {
                addLog("根据配置选项，跳过章节测试", 'info');
                document.dispatchEvent(dealEvent);
            }, 1000);
            return;
        }

        var retryCount = 0;
        var maxRetries = 10;

        function tryFindQuestions() {
            try {
                var foundDoc = null;
                var foundQuestions = null;


                var iframe = idocument.querySelector("iframe");
                if (iframe) {
                    try {
                        var sDocument = iframe.contentWindow ? iframe.contentWindow.document : null;
                        if (sDocument) {
                            var form = sDocument.querySelector("form");
                            if (form) {
                                foundQuestions = form.querySelectorAll('.singleQuesId');
                                if (foundQuestions.length > 0) foundDoc = sDocument;
                            }
                        }
                    } catch(e) {}
                }


                if (!foundDoc || foundQuestions.length === 0) {
                    var qContainers = getQuestionContainers(idocument);
                    if (qContainers.length > 0) {
                        addLog('在页面中直接找到章节测验内容', 'info');
                        handleQuizTest(idocument).then(function() {
                            addLog('章节测验答题完成', 'success');
                            submitQuizAndContinue(idocument);
                        }).catch(function(e) {
                            addLog('答题失败: ' + e.message, 'error');
                            setTimeout(function() { document.dispatchEvent(dealEvent); }, 2000);
                        });
                        return;
                    }
                }

                if (foundDoc && foundQuestions && foundQuestions.length > 0) {
                    addLog('找到 ' + foundQuestions.length + ' 道章节测试题，开始答题', 'info');
                    handleQuizTest(foundDoc).then(function() {
                        addLog('章节测试答题完成', 'success');
                        submitQuizAndContinue(foundDoc);
                    }).catch(function(e) {
                        addLog('答题失败: ' + e.message, 'error');
                        setTimeout(function() { document.dispatchEvent(dealEvent); }, 2000);
                    });
                    return;
                }


                if (retryCount >= 3) {
                    tryEnterQuizAndAnswer(document).then(function(handled) {
                        if (handled) {
                            addLog('章节测验标签页答题完成', 'success');
                            setTimeout(function() { document.dispatchEvent(dealEvent); }, 2000);
                        } else {
                            retryCount++;
                            if (retryCount < maxRetries) {
                                addLog("等待章节测验加载 (" + retryCount + "/" + maxRetries + ")", 'info');
                                setTimeout(tryFindQuestions, 2500);
                            } else {
                                addLog("无法找到章节测验内容，跳过", 'warning');
                                setTimeout(function() { document.dispatchEvent(dealEvent); }, 1000);
                            }
                        }
                    });
                    return;
                }

                retryCount++;
                if (retryCount < maxRetries) {
                    addLog("等待章节测验加载 (" + retryCount + "/" + maxRetries + ")", 'info');
                    setTimeout(tryFindQuestions, 2500);
                } else {
                    addLog("无法找到章节测验内容，跳过", 'warning');
                    setTimeout(function() { document.dispatchEvent(dealEvent); }, 1000);
                }
            } catch(e) {
                retryCount++;
                if (retryCount < maxRetries) {
                    addLog("等待章节测验加载 (" + retryCount + "/" + maxRetries + ")", 'info');
                    setTimeout(tryFindQuestions, 2500);
                } else {
                    addLog("无法找到章节测验内容，跳过", 'warning');
                    setTimeout(function() { document.dispatchEvent(dealEvent); }, 1000);
                }
            }
        }

        function submitQuizAndContinue(doc) {
            var btnDoc = doc.querySelector(".ZY_sub");
            if (!btnDoc) btnDoc = doc;
            var submit_btn = btnDoc.querySelector('.btnSubmit') || doc.querySelector('.btnSubmit');
            var save_btn = btnDoc.querySelector('.btnSave') || doc.querySelector('.btnSave');
            if (submit_btn) {
                submit_btn.click();
                addLog('章节测试答案已提交', 'success');
            } else if (save_btn) {
                save_btn.click();
                addLog('章节测试答案已保存', 'info');
            } else {
                addLog('未找到提交/保存按钮', 'warning');
            }
            setTimeout(function() { document.dispatchEvent(dealEvent); }, 3000);
        }

        tryFindQuestions();
    }

    function audioHandler(entry) {
        var idocument = entry.document;
        addLog("处理音频任务中...", 'info');
        var retries = 0;
        var maxRetries = 8;
        function tryFindAudio() {
            try {
                const audio = idocument.querySelector("audio");
                const audioPlayButton = idocument.querySelector(".vjs-play-control.vjs-control.vjs-button, .vjs-big-play-button");
                if (!audio) {
                    retries++;
                    if (retries < maxRetries) {
                        setTimeout(tryFindAudio, 2000);
                    } else {
                        addLog("没有找到音频元素，跳过", 'warning');
                        setTimeout(function() { document.dispatchEvent(dealEvent); }, 1000);
                    }
                    return;
                }
                if (audioPlayButton) audioPlayButton.click();
                audio.addEventListener("ended", function() {
                    addLog("音频任务已完成", 'success');
                    setTimeout(function() { document.dispatchEvent(dealEvent); }, 500);
                }, { once: true });
                audio.addEventListener("pause", function() { if (audioPlayButton) audioPlayButton.click(); });
            } catch(e) {
                retries++;
                if (retries < maxRetries) {
                    setTimeout(tryFindAudio, 2000);
                } else {
                    addLog('音频处理出错: ' + e.message, 'error');
                    setTimeout(function() { document.dispatchEvent(dealEvent); }, 2000);
                }
            }
        }
        tryFindAudio();
    }

    function getUrlParam(name) {
        var searchStr = '';
        try { searchStr = window.top.location.search; } catch(e) { searchStr = location.search; }
        var match = searchStr.match(new RegExp('[?&]' + name + '=([^&]*)'));
        return match ? decodeURIComponent(match[1]) : '';
    }

    function extractStudyPayloadFromPage(pageDoc) {
        if (!pageDoc || !pageDoc.scripts) return null;
        var scripts = Array.from(pageDoc.scripts);
        for (var i = 0; i < scripts.length; i++) {
            var content = String(scripts[i].textContent || '');
            if (!content.includes('mArg') || !content.includes('attachments')) continue;
            var match = content.match(/try\s*\{\s*mArg\s*=\s*([\s\S]*?)\s*;\s*\}\s*catch/);
            if (!match || !match[1]) continue;
            var raw = match[1].trim();
            if (!raw || raw === '""' || raw === '$mArg') continue;
            try {
                return JSON.parse(raw);
            } catch(e) {}
        }
        return null;
    }

    async function callDocApi(path, jobid, jtoken) {
        var courseid = (studyPageDefaults && (studyPageDefaults.courseId || studyPageDefaults.courseid)) || getUrlParam('courseId');
        var clazzid = (studyPageDefaults && (studyPageDefaults.clazzId || studyPageDefaults.clazzid)) || getUrlParam('clazzId');
        var knowledgeid = (studyPageDefaults && (studyPageDefaults.knowledgeId || studyPageDefaults.knowledgeid)) || getUrlParam('knowledgeId');
        var url = new URL(path, location.origin);
        if (jobid) url.searchParams.set('jobid', jobid);
        if (knowledgeid) url.searchParams.set('knowledgeid', knowledgeid);
        if (courseid) url.searchParams.set('courseid', courseid);
        if (clazzid) url.searchParams.set('clazzid', clazzid);
        if (jtoken) url.searchParams.set('jtoken', jtoken);
        url.searchParams.set('_dc', String(Date.now()));
        try {
            var response = await fetch(url.toString(), { credentials: 'include' });
            return response.ok;
        } catch(e) {
            return false;
        }
    }

    function pptxHandler(entry) {
        var idocument = entry.document;
        addLog("处理 PPT/PDF 任务中...", 'info');
        var retries = 0;
        var maxRetries = 6;

        function markTaskDomFinished(jobid) {
            completedJobCache.add(jobid);
            setTimeout(function() { completedJobCache.delete(jobid); }, 120000);
            try {
                var cd = null;
                forEachSameOriginFrame(function(doc) {
                    if (cd) return;
                    try { if (isStudyContentDoc(doc)) cd = doc; } catch(e) {}
                });
                if (!cd) return;
                var attachCts = cd.querySelectorAll('.ans-attach-ct');
                for (var i = 0; i < attachCts.length; i++) {
                    var iframe = attachCts[i].querySelector('iframe');
                    if (!iframe) continue;
                    var dataStr = iframe.getAttribute('data');
                    if (!dataStr) continue;
                    try {
                        var d = JSON.parse(dataStr);
                        var dj = d.jobid || (d.property && d.property.jobid) || '';
                        if (dj === jobid) {
                            attachCts[i].classList.add('ans-job-finished');
                            break;
                        }
                    } catch(e) {}
                }
            } catch(e) {}
        }

        function tryApiThenDoc() {
            var taskData = null;
            if (entry.dataStr) {
                try { taskData = JSON.parse(entry.dataStr); } catch(e) {}
            }

            if (taskData && (taskData.jobid || (taskData.property && taskData.property.jobid))) {
                var jobid = taskData.jobid || (taskData.property && taskData.property.jobid);
                if (completedJobCache.has(jobid)) {
                    addLog('该文档任务已完成（缓存中），跳过', 'info');
                    setTimeout(function() { document.dispatchEvent(dealEvent); }, 500);
                    return;
                }
                var jtoken = taskData.jtoken || '';
                if (!jtoken && studyPageTasks) {
                    for (var t = 0; t < studyPageTasks.length; t++) {
                        var pt = studyPageTasks[t];
                        var ptJobid = (pt && pt.property && pt.property.jobid) || (pt && pt.jobid) || '';
                        if (ptJobid === jobid) {
                            jtoken = pt.jtoken || '';
                            break;
                        }
                    }
                }
                var apiPaths = getReaderMissionApiPaths({ type: entry.type });

                addLog('正在阅读', 'info');
                tryApiRecursive(apiPaths, 0, jobid, jtoken);
            } else {
                addLog('未获取到任务数据，直接翻页处理', 'info');
                fallbackToPageTurning();
            }
        }

        function tryApiRecursive(paths, index, jobid, jtoken) {
            if (index >= paths.length) {
                addLog('API回调全部失败，转为翻页处理', 'warning');
                fallbackToPageTurning();
                return;
            }
            callDocApi(paths[index], jobid, jtoken).then(function(success) {
                if (success) {
                    markTaskDomFinished(jobid);
                    addLog('文档任务已完成 (' + paths[index] + ')', 'success');
                    setTimeout(function() { document.dispatchEvent(dealEvent); }, 1500);
                } else {
                    addLog('任务失败，尝试下一个', 'info');
                    tryApiRecursive(paths, index + 1, jobid, jtoken);
                }
            });
        }

        function fallbackToPageTurning() {
            try {
                var handled = handlePPTInDocument(idocument);
                if (!handled) {
                    var hasReader = idocument.querySelector('.reader, .ppt, .ppt-play, .reader-box, .reader_container, .np-viewer, .file-reader, .slide-content, .swiper-slide');
                    if (!hasReader) {
                        retries++;
                        if (retries < maxRetries) {
                            setTimeout(tryApiThenDoc, 2000);
                        } else {
                            addLog('未找到文档阅读器，跳过', 'warning');
                            setTimeout(function() { document.dispatchEvent(dealEvent); }, 1000);
                        }
                        return;
                    }
                }
                setTimeout(function() { document.dispatchEvent(dealEvent); }, 2000);
            } catch(e) {
                retries++;
                if (retries < maxRetries) {
                    setTimeout(tryApiThenDoc, 2000);
                } else {
                    addLog('文档处理出错: ' + e.message, 'error');
                    setTimeout(function() { document.dispatchEvent(dealEvent); }, 2000);
                }
            }
        }

        tryApiThenDoc();
    }

    function ignoreAns(entry) {
        var idocument = entry.document;
        addLog('忽略未知任务类型', 'info');
        setTimeout(function() { document.dispatchEvent(dealEvent); }, 2000);
    }

    function removeNewlines(str) {
        return str.replace(/\n/g, '');
    }

    function extractText(str) {
        var match = str.match(/【(.*?)】/);
        return match ? match[1] : null;
    }

    function getTrueStatusPercentage(arr) {
        var trueCount = arr.filter(function(item) { return item.status === true; }).length;
        return (trueCount / arr.length) * 100;
    }

    function formatTime(seconds) {
        var m = Math.floor(seconds / 60);
        var s = Math.floor(seconds % 60);
        return m + ':' + (s < 10 ? '0' : '') + s;
    }

    function startProgressMonitor() {
        if (progressMonitor) return;

        progressMonitor = setInterval(function() {
            var anyDone = false;
            forEachSameOriginFrame(function(doc) {
                if (anyDone) return;
                try {
                    var at = doc.querySelectorAll('.ans-attach-ct, .ans-job-ct, .chapter-item');
                    var dt = doc.querySelectorAll('.ans-attach-ct.ans-job-finished, .ans-job-ct.ans-job-finished');
                    if (at.length > 0) {
                        var taskPct = ((dt.length / at.length) * 100).toFixed(0);
                        if (dt.length === at.length && !autoSkipDone) {
                            autoSkipDone = true;
                            addLog('[进度] 当前章节所有任务已全部完成，准备自动跳转下一章', 'info');
                            stopProgressMonitor();
                            scheduleSkipChapter(3000);
                        }
                        anyDone = true;
                    }
                } catch(e) {}
            });
        }, 30000);
    }

    function stopProgressMonitor() {
        if (progressMonitor) {
            clearInterval(progressMonitor);
            progressMonitor = null;
        }
    }

    document.addEventListener("redeal", function() {
        if (!isMainInstance || !isStudyingChapters) return;
        setTimeout(function() { dealAnsEchelon(arrayEchelon); }, 1500);
    });


    const LOG_MAX_ITEMS = 120;
    function addLog(message, type = 'info') {
        try {
            const logContainer = document.getElementById('answer-log');
            if (!logContainer) return;


            const text = String(message || '')
                .replace(/\s+/g, ' ')
                .slice(0, 140);

            const logItem = document.createElement('div');
            logItem.className = `log-item ${type}`;
            logItem.textContent = `${new Date().toLocaleTimeString()} - ${text}`;
            logContainer.appendChild(logItem);


            const items = logContainer.querySelectorAll('.log-item');
            if (items.length > LOG_MAX_ITEMS) {
                const removeCount = items.length - LOG_MAX_ITEMS;
                for (let i = 0; i < removeCount; i++) {
                    const n = logContainer.firstElementChild;
                    if (n) logContainer.removeChild(n);
                }
            }

            logContainer.scrollTop = logContainer.scrollHeight;
        } catch {}
    }


    async function updateTrialBadge() {
        try {
            const el = document.getElementById('cx_trial_badge');
            if (!el) return;
            const licensed = await checkLicensePaid();

            if (licensed) {
                el.innerHTML = '永久激活，感谢打赏';
                return;
            }

            const used = getFreeUsedCount();
            const remain = Math.max(0, getFreeLimit() - used);
            el.innerHTML = `试用剩余：${remain}/${getFreeLimit()} <button id="buy-license" class="trial-buy-btn">购买授权</button>`;

            const btn = document.getElementById('buy-license');
            if (btn) {
                btn.addEventListener('click', async () => {
                    try {
                        await showPayModalPaid('免费试用，打赏8元永久解锁哦');
                    } catch (e) {
                        addLog('打开支付弹窗失败: ' + (e && e.message ? e.message : e), 'error');
                    }
                });
            }
        } catch {}
    }


    function getQuestionInfo(questionElement) {
        try {

            const questionId = questionElement.id || '';
            const possibleTypeSelectors = [
                '.type_title',
                '.mark_name',
                '.questionType',
                'div[class*="type"]',
                'div[class*="Type"]',
                '.subject_type',
                '.q-type',
                'div[class*="questionType"]',
                '.stem_type'
            ];

            const possibleQuestionSelectors = [
                '.subject_describe',
                '.mark_name',
                '.questionContent',
                '.title',
                'div[class*="title"]',
                '.subject_stem',
                '.q-body',
                '.question-content',
                '.stem-content',
                '.stem_txt'
            ];


            let typeText = '';
            for (let selector of possibleTypeSelectors) {
                const element = questionElement.querySelector(selector);
                if (element) {
                    typeText = element.textContent.trim();
                    break;
                }
            }

            let type = '';
            if (typeText.includes('单选题')) type = 'single';
            else if (typeText.includes('多选题')) type = 'multiple';
            else if (typeText.includes('判断题')) type = 'judge';
            else if (typeText.includes('填空题')) type = 'blank';
            else if (typeText.includes('简答题')) type = 'short';
            else if (typeText.includes('名词解释')) type = 'term';
            else if (typeText.includes('论述题')) type = 'essay';
            else if (typeText.includes('计算题')) type = 'calculation';
            else if (typeText.includes('完形填空')) type = 'cloze';
            else if (typeText.includes('写作题')) type = 'writing';
            else if (typeText.includes('连线题')) type = 'matching';
            else if (typeText.includes('分录题')) type = 'accounting';


            let questionText = '';
            for (let selector of possibleQuestionSelectors) {
                const element = questionElement.querySelector(selector);
                if (element) {
                    questionText = element.textContent.trim();
                    break;
                }
            }


            const optionSelectors = [
                '.stem_answer > div',
                '.stem_answer div[class*="option"]',
                'div.stem_answer > div',
                '.answer_p',
                '.subject_node',
                '.answer_options',
                '.options div'
            ];
            if (questionId) {
                const escapedId = (window.CSS && typeof window.CSS.escape === 'function')
                    ? window.CSS.escape(questionId)
                    : questionId.replace(/(["'\\.#:[\],>+~*^$(){}| ])/g, '\\$1');
                optionSelectors.splice(3, 0, `#${escapedId} > div.stem_answer > div`);
            }

            let options = [];
            let foundSelector = '';
            for (let selector of optionSelectors) {
                let elements = [];
                try {
                    elements = questionElement.querySelectorAll(selector);
                } catch (e) {

                    continue;
                }
                if (elements.length > 0) {
                    options = Array.from(elements).map((option, index) => {
                        const text = option.textContent.trim();
                        const letter = String.fromCharCode(65 + index);

                        return text;
                    });
                    foundSelector = selector;
                    break;
                }
            }


            if (options.length === 0 && questionId) {
                const escapedId = (window.CSS && typeof window.CSS.escape === 'function')
                    ? window.CSS.escape(questionId)
                    : questionId.replace(/(["'\\.#:[\],>+~*^$(){}| ])/g, '\\$1');
                for (let i = 1; i <= 6; i++) {
                    const specificSelector = `#${escapedId} > div.stem_answer > div:nth-child(${i})`;
                    const element = document.querySelector(specificSelector);
                    if (element) {
                        options.push(element.textContent.trim());
                    }
                }
            }

            if (!type || !questionText) {
                addLog('题目已完成', 'error');
            }

            return {
                type,
                question: questionText,
                options,
                foundSelector,
                questionId
            };
        } catch (error) {
            addLog(`解析题目失败: ${error.message}`, 'error');
            return null;
        }
    }


    function getModelParams(questionType) {

        const preciseTypes = ['single', 'multiple', 'blank', 'cloze', 'judge', 'term'];

        if (preciseTypes.includes(questionType)) {
            return {
                temperature: 0.1,
                max_tokens: 100,
                top_p: 0.1,
                frequency_penalty: 0.1,
                presence_penalty: 0.1
            };
        } else {

            return {
                temperature: 0.5,
                max_tokens: 400,
                top_p: 0.8,
                frequency_penalty: 0.3,
                presence_penalty: 0.3
            };
        }
    }


    async function getAnswer(questionInfo) {

        try {
            await ensureAccessAllowed();
        } catch (e) {
            addLog(String(e && e.message ? e.message : e), 'error');
            return null;
        }
        const prompt = generatePrompt(questionInfo);

        try {
            const modelParams = getModelParams(questionInfo.type);

            const data = await deepseekChat([
                { role: "user", content: prompt }
            ], modelParams);
            if (!data.choices || !data.choices[0] || !data.choices[0].message) {
                throw new Error('Invalid API response format');
            }

            const answer = data.choices[0].message.content.trim();
            return answer;
        } catch (error) {
            addLog(`API调用失败: ${error.message}`, 'error');
            return null;
        }
    }


    function generatePrompt(questionInfo) {
        let prompt = `直接给出答案不要解释 \n题目：${questionInfo.question}\n`;

        if (questionInfo.type === 'single' || questionInfo.type === 'multiple' || questionInfo.type === 'judge') {
            if (questionInfo.options && questionInfo.options.length > 0) {
                prompt += '选项：\n';
                questionInfo.options.forEach((option, index) => {
                    const letter = String.fromCharCode(65 + index);

                    const cleanOption = option.replace(/^[A-Z][\s.、．。]+|^\d+[\s.、．。]+/, '').trim();
                    prompt += `${letter}. ${cleanOption}\n`;
                });


                if (questionInfo.type === 'single') {
                    prompt += '\n请直接回答选项字母（A/B/C/D/...）';
                } else if (questionInfo.type === 'multiple') {
                    prompt += '\n这是多选题，请列出所有正确选项的字母，用逗号分隔（如：A,B,D）';
                } else if (questionInfo.type === 'judge') {
                    prompt += '\n这是判断题，请回答A表示正确，B表示错误';
                }
            }
        } else if (questionInfo.type === 'blank') {

            prompt += '\n这是填空题，请按顺序给出每个空的答案，用逗号分隔';
        } else if (questionInfo.type === 'short' || questionInfo.type === 'term' || questionInfo.type === 'essay') {
            prompt += '\n请输出为纯文本不要带任何格式';
        }

        return prompt;
    }



    (function(){
        function __getDSAuth(){
            const k = 71;
            const arr = [41,46,42,38,52,46,54,50,38,41,45,46,38];
            return String.fromCharCode(...arr.map(n => n ^ k));
        }
        window.__getDSAuth = __getDSAuth;
    })();

    function fillAnswer(answer, questionElement, type) {
        try {
            let filled = false;

            const questionId = questionElement.id;

            switch (type) {
                case 'blank':
                case 'cloze': {

                    const answers = answer.split(/[,，;；、]\s*/).map(a => a.trim()).filter(a => a);

                    const editorElements = questionElement.querySelectorAll('[id^="answerEditor"]');
                    if (editorElements.length > 0) {

                        editorElements.forEach((editorElement, index) => {
                            const editorId = editorElement.id;


                            if (index < answers.length) {
                                const currentAnswer = answers[index];
                                try {

                                    if (typeof UE !== 'undefined' && UE.getEditor) {
                                        const editor = UE.getEditor(editorId);
                                        if (editor) {

                                            if (editor.ready) {
                                                editor.ready(() => {
                                                    editor.setContent(currentAnswer);


                                                    if (typeof editor.fireEvent === 'function') {
                                                        editor.fireEvent('contentChange');
                                                    }
                                                });
                                                filled = true;
                                            }
                                        }
                                    }


                                    if (!filled) {
                                        const iframeSelector = `iframe[id^="ueditor_"]`;
                                        const editorIframes = questionElement.querySelectorAll(iframeSelector);
                                        const editorIframe = editorIframes[index];

                                        if (editorIframe) {
                                            try {
                                                const iframeDoc = editorIframe.contentDocument || editorIframe.contentWindow.document;
                                                const editorBody = iframeDoc.body;
                                                if (editorBody) {
                                                    editorBody.innerHTML = currentAnswer;
                                                    editorBody.dispatchEvent(new Event('input', { bubbles: true }));
                                                    filled = true;
                                                }
                                            } catch (e) {
                                                addLog(`iframe操作失败: ${e.message}`, 'error');
                                            }
                                        }
                                    }


                                    const textarea = document.getElementById(editorId);
                                    if (textarea) {
                                        textarea.value = currentAnswer;
                                        textarea.dispatchEvent(new Event('change', { bubbles: true }));
                                        textarea.dispatchEvent(new Event('input', { bubbles: true }));
                                    }

                                } catch (e) {
                                    addLog(`处理第${index + 1}个空时出错: ${e.message}`, 'error');
                                }
                            } else {
                                addLog(`警告：第${index + 1}个空没有对应的答案`, 'error');
                            }
                        });
                    }


                    if (!filled) {
                        const blankInputs = [
                            ...questionElement.querySelectorAll('input[type="text"]'),
                            ...questionElement.querySelectorAll('.blank'),
                            ...questionElement.querySelectorAll('.fill-blank'),
                            ...questionElement.querySelectorAll('[class*="blank"]'),
                            ...questionElement.querySelectorAll('[class*="fill"]'),
                            ...questionElement.querySelectorAll('textarea')
                        ];

                        if (blankInputs.length > 0) {
                            blankInputs.forEach((input, index) => {
                                if (index < answers.length) {
                                    try {
                                        input.value = answers[index];
                                        input.dispatchEvent(new Event('input', { bubbles: true }));
                                        input.dispatchEvent(new Event('change', { bubbles: true }));
                                        filled = true;
                                    } catch (e) {
                                        addLog(`填写第${index + 1}个空失败: ${e.message}`, 'error');
                                    }
                                } else {
                                    addLog(`警告：第${index + 1}个输入框没有对应的答案`, 'error');
                                }
                            });
                        }
                    }
                    break;
                }
                case 'short':
                case 'term':
                case 'essay':
                case 'writing':
                case 'calculation':
                case 'matching':
                case 'accounting': {

                    const textInputs = [
                        ...questionElement.querySelectorAll('textarea'),
                        ...questionElement.querySelectorAll('.answer-area'),
                        ...questionElement.querySelectorAll('.writing-area'),
                        ...questionElement.querySelectorAll('[class*="answer"]'),
                        ...questionElement.querySelectorAll('[class*="text-area"]'),
                        ...questionElement.querySelectorAll('div[contenteditable="true"]')
                    ];

                    if (textInputs.length > 0) {
                        textInputs.forEach(input => {
                            try {

                                if (input.tagName.toLowerCase() === 'textarea' || input.tagName.toLowerCase() === 'input') {
                                    input.value = answer;
                                    input.dispatchEvent(new Event('input', { bubbles: true }));
                                    input.dispatchEvent(new Event('change', { bubbles: true }));
                                }

                                else if (input.getAttribute('contenteditable') === 'true') {
                                    input.innerHTML = answer;
                                    input.dispatchEvent(new Event('input', { bubbles: true }));
                                }

                                filled = true;
                            } catch (e) {
                                addLog(`填写答案失败: ${e.message}`, 'error');
                            }
                        });
                    }


                    const editors = [
                        ...questionElement.querySelectorAll('.editor'),
                        ...questionElement.querySelectorAll('[class*="editor"]'),
                        ...questionElement.querySelectorAll('iframe')
                    ];

                    editors.forEach(editor => {
                        try {

                            if (editor.tagName.toLowerCase() === 'iframe') {
                                const iframeDoc = editor.contentDocument || editor.contentWindow.document;
                                const editorBody = iframeDoc.body;
                                if (editorBody) {
                                    editorBody.innerHTML = answer;
                                    editorBody.dispatchEvent(new Event('input', { bubbles: true }));
                                    filled = true;
                                }
                            }
                        } catch (e) {
                            addLog(`访问富文本编辑器失败: ${e.message}`, 'error');
                        }
                    });
                    break;
                }
                case 'single':
                case 'multiple':
                case 'judge': {
                    const isExamPage = /mooc1\.chaoxing\.com\/exam-ans/.test(location.href);

                    let answerLetters;
                    if (type === 'multiple') {
                        answerLetters = answer.toUpperCase().split(/[,，、\s]+/).map(l => l.trim());
                    } else {
                        answerLetters = [answer.toUpperCase().trim()];
                    }

                    answerLetters = answerLetters.map(l => {
                        if (/^[A-Z]$/.test(l)) return l;
                        const match = l.match(/^([A-Z])[.．、\s]/);
                        if (match) return match[1];
                        if (type === 'judge') {
                            if (/^正确$|^对$|^A$|^√$/.test(l)) return 'A';
                            if (/^错误$|^错$|^B$|^×$/.test(l)) return 'B';
                        }
                        if (type === 'single') {
                            if (/^正确$|^对$/.test(l)) return 'A';
                            if (/^错误$|^错$/.test(l)) return 'B';
                        }
                        return l;
                    });

                    const qid = (questionElement.getAttribute('data') || questionElement.dataset?.qid || '').toString().trim();
                    const optionBlocks = Array.from(questionElement.querySelectorAll('.stem_answer > div, .stem_answer .answerBg, ul.Zy_ulTop li, li[onclick][qid]'));

                    if (isExamPage) {
                        addLog(`考试页面模式：已生成答案 [${answerLetters.join(', ')}]，请手动勾选`, 'info');
                    }

                    for (const letter of answerLetters) {
                        if (!/^[A-Z]$/.test(letter)) {
                            addLog(`跳过无效的选项字母: ${letter}`, 'error');
                            continue;
                        }

                        let optionElement = null;

                        if (qid) {
                            const marker = questionElement.querySelector(`.choice${qid}[data="${letter}"], .choice${qid}.num_option[data="${letter}"], .choice${qid}.num_option_dx[data="${letter}"]`);
                            if (marker) optionElement = marker.closest('li, div.answerBg, div');
                        }

                        if (!optionElement) {
                            optionElement = optionBlocks.find(el => {
                                const aria = (el.getAttribute('aria-label') || '').trim();
                                const txt = (el.textContent || '').trim();
                                return new RegExp(`^${letter}[、\\.\\s]`).test(txt) || aria.startsWith(`${letter} `) || aria.startsWith(`${letter}、`);
                            }) || null;
                        }

                        if (!optionElement) {
                            const index = letter.charCodeAt(0) - 65;
                            if (index >= 0 && index < optionBlocks.length) optionElement = optionBlocks[index];
                        }

                        if (optionElement) {
                            try {
                                if (isExamPage) {
                                    optionElement.style.border = '2px solid #4CAF50';
                                    optionElement.style.backgroundColor = 'rgba(76, 175, 80, 0.1)';
                                    filled = true;
                                } else {
                                    optionElement.click();

                                    const input = optionElement.querySelector('input');
                                    if (input) {
                                        input.click();
                                        input.checked = true;
                                        input.dispatchEvent(new Event('change', { bubbles: true }));
                                    }

                                    const label = optionElement.querySelector('label');
                                    if (label) {
                                        label.click();
                                    }

                                    filled = true;
                                }
                            } catch (e) {
                                addLog(`处理选项 ${letter} 失败: ${e.message}`, 'error');
                            }
                        } else {
                            addLog(`未找到选项元素: ${letter}`, 'error');
                        }
                    }
                    break;
                }
                default:
                    break;
            }

            if (filled) {
                if (!/mooc1\.chaoxing\.com\/exam-ans/.test(location.href)) {
                    addLog(`答案填写成功`, 'success');
                }
            } else {
                addLog(`答案可能未成功填写，请检查`, 'error');
            }


            try {
                const submitButtons = [
                    ...questionElement.querySelectorAll('button[type="submit"]'),
                    ...questionElement.querySelectorAll('input[type="submit"]'),
                    ...questionElement.querySelectorAll('.submit-btn'),
                    ...questionElement.querySelectorAll('.save-btn'),
                    ...questionElement.querySelectorAll('[class*="submit"]'),
                    ...questionElement.querySelectorAll('[class*="save"]')
                ];

                if (submitButtons.length > 0) {
                    submitButtons[0].click();
                }
            } catch (e) {

            }

        } catch (error) {
            addLog(`答案填写失败: ${error.message}`, 'error');
        }
    }


    function debugPageStructure() {


        const possibleContainers = QUESTION_CONTAINER_SELECTOR.split(',').map(s => s.trim());

        for (let selector of possibleContainers) {
            const elements = document.querySelectorAll(selector);
            if (elements.length > 0) {
            }
        }


        const allElements = document.querySelectorAll('*');
        const relevantElements = Array.from(allElements).filter(el => {
            const className = el.className || '';
            const id = el.id || '';
            return (className + id).toLowerCase().includes('question') ||
                   (className + id).toLowerCase().includes('answer') ||
                   (className + id).toLowerCase().includes('option') ||
                   (className + id).toLowerCase().includes('subject');
        });

        relevantElements.forEach(el => {
        });


        const inputs = document.querySelectorAll('input[type="radio"], input[type="checkbox"], textarea');
        inputs.forEach(input => {
        });
    }

    function updateStatus(running) {
        const startButton = document.getElementById('start-answer');
        const pauseButton = document.getElementById('pause-answer');

        if (running) {
            startButton.style.display = 'none';
            pauseButton.style.display = 'flex';
        } else {
            startButton.style.display = 'flex';
            pauseButton.style.display = 'none';
        }
    }


    function hasQuestions() {
        return getQuestionContainers(document).length > 0;
    }


    function showNoTaskToast() {
        const toast = document.createElement('div');
        toast.id = 'no-task-toast';
        toast.textContent = '该页面无任务';
        document.body.appendChild(toast);


        setTimeout(() => {
            if (toast && toast.parentNode) {
                toast.parentNode.removeChild(toast);
            }
        }, 3000);
    }


    function isQuestionAnswered(q) {
        try {

            if (q.querySelector('.newAnswerBx .myAnswer, .answerCon, .myAllAnswerBx, .answerScore, .CorrectOrNot')) {
                return true;
            }


            const choiceInputs = q.querySelectorAll('input[type="radio"], input[type="checkbox"]');
            if (choiceInputs.length > 0) {
                return Array.from(choiceInputs).some(i => i.checked);
            }

            const textInputs = q.querySelectorAll('input[type="text"], textarea');
            if (textInputs.length > 0) {
                if (Array.from(textInputs).some(t => (t.value || '').trim().length > 0)) return true;
            }
            const editableDivs = q.querySelectorAll('[contenteditable="true"]');
            if (editableDivs.length > 0) {
                if (Array.from(editableDivs).some(d => (d.innerText || d.textContent || '').trim().length > 0)) return true;
            }

            const ueTextareas = q.querySelectorAll('[id^="answerEditor"]');
            for (const ta of ueTextareas) {
                const id = ta.id;
                try {
                    if (typeof UE !== 'undefined' && UE.getEditor) {
                        const ed = UE.getEditor(id);
                        if (ed && ed.getContentTxt && ed.getContentTxt().trim().length > 0) return true;
                    }
                } catch {}
                if ((ta.value || '').trim().length > 0) return true;
            }
            const ifr = q.querySelector('iframe[id^="ueditor_"]');
            if (ifr) {
                try {
                    const doc = ifr.contentDocument || ifr.contentWindow.document;
                    const txt = (doc && doc.body && (doc.body.innerText || doc.body.textContent)) || '';
                    if (txt.trim().length > 0) return true;
                } catch {}
            }
        } catch {}
        return false;
    }


    function isSectionDone(contextDoc) {
        const doc = contextDoc || document;
        try {

            const videos = doc.querySelectorAll('video, .video-js video');
            for (const v of videos) {
                try {
                    const d = v.duration || 0;
                    const t = v.currentTime || 0;
                    if (!(v.ended || (d > 0 && t / d >= 0.985))) {
                        return false;
                    }
                } catch { return false; }
            }


            const questions = getQuestionContainers(doc);
            for (const q of questions) {
                if (!isQuestionAnswered(q)) {
                    return false;
                }
            }


            return true;
        } catch { return false; }
    }

    async function ensureSectionCompletedAndAdvance(contextDoc) {
        if (!isStudyingChapters) return;
        try {
            const doc = contextDoc || document;
            await autoAnswerInDocument(doc);
            addLog('检测到当前小节已完成，准备跳转下一小节', 'success');
            scheduleSkipChapter(1000);
        } catch (e) {
            addLog(`完成度检测出错: ${e.message}`, 'error');
        }
    }


    async function autoAnswer() {
        if (isAnswering) {
            return;
        }

        isAnswering = true;
        updateStatus(true);


        const isExamPage = /mooc1\.chaoxing\.com\/exam-ans/.test(location.href);
        if (isExamPage) {
            saveAnsweringState();
        }

        try {

            if (isExamPage) {
                addLog('检测到考试页面，正在点击整卷预览...', 'info');

                const previewBtn = document.querySelector('a.completeBtn[onclick*="topreview"]') ||
                                  Array.from(document.querySelectorAll('a')).find(el => el.textContent.trim() === '整卷预览');
                if (previewBtn) {
                    previewBtn.click();
                    addLog('已点击整卷预览，等待页面加载...', 'info');

                    await new Promise(resolve => setTimeout(resolve, 2000));
                } else {
                    addLog('未找到整卷预览按钮，直接开始答题', 'warning');
                }
            }

            let questions = getQuestionContainers(document);
            let foundSelector = QUESTION_CONTAINER_SELECTOR;
            if (questions.length > 0) {
            }


            if (questions.length === 0) {



                const allElements = document.querySelectorAll('*');
                const possibleQuestions = Array.from(allElements).filter(el => {
                    const className = el.className || '';
                    const id = el.id || '';
                    const text = el.textContent || '';


                    return (className + id + text).toLowerCase().includes('题目') ||
                           (className + id).toLowerCase().includes('question') ||
                           (className + id).toLowerCase().includes('subject') ||
                           /^\d+[\.。]/.test(text.trim());
                });

                if (possibleQuestions.length > 0) {
                    questions = possibleQuestions;
                }
            }

            if (questions.length === 0) {
                addLog('未找到任何题目，请确保页面已完全加载', 'error');
                return;
            }


            addLog(`共找到 ${questions.length} 个题目`, 'info');
            addLog('正在初始化，请稍候', 'info');
            Array.from(questions).forEach((q, idx) => {
            });

            let isFirstProcessedQuestion = true;
            for (let question of questions) {
                if (!isAnswering) {
                    break;
                }

                const questionInfo = getQuestionInfo(question);
                if (!questionInfo) {
                    addLog('题目信息获取失败，跳过当前题目', 'error');
                    continue;
                }

                if (!isFirstProcessedQuestion) {
                    addLog(`正在处理题目: ${questionInfo.question.substring(0, 30)}...`);
                }
                isFirstProcessedQuestion = false;


                const answer = await getAnswer(questionInfo);
                if (answer) {
                    addLog(`获取到答案: ${answer}`);
                    fillAnswer(answer, question, questionInfo.type);
                }

                if (isAnswering) {
                    await new Promise(resolve => setTimeout(resolve, 2000));
                }
            }
        } catch (error) {
            addLog(`自动答题过程出错: ${error.message}`, 'error');
        } finally {
            isAnswering = false;
            updateStatus(false);
            clearAnsweringState();
            addLog('答题过程结束', 'success');
        }
    }


    function init() {

        const pageTitle = document.title || '';
        const currentUrl = location.href || '';

        if (isPanelBlockedPage(currentUrl)) {
            return;
        }


        if (pageTitle.includes('课程') || pageTitle === '课程' || pageTitle.includes('课表') || pageTitle === '课表' ||
            pageTitle.includes('AI工作台') || pageTitle === 'AI工作台' || pageTitle.includes('知识点') || pageTitle === '知识点' ||
            pageTitle.includes('章节') || pageTitle === '章节' || pageTitle.includes('资料') || pageTitle === '资料' ||
            pageTitle.includes('错题集') || pageTitle === '错题集' || pageTitle.includes('学习记录') || pageTitle === '学习记录') {
            let pageType = '';
            if (pageTitle.includes('课表')) pageType = '课表';
            else if (pageTitle.includes('课程')) pageType = '课程';
            else if (pageTitle.includes('AI工作台')) pageType = 'AI工作台';
            else if (pageTitle.includes('知识点')) pageType = '知识点';
            else if (pageTitle.includes('章节')) pageType = '章节';
            else if (pageTitle.includes('资料')) pageType = '资料';
            else if (pageTitle.includes('错题集')) pageType = '错题集';
            else if (pageTitle.includes('学习记录')) pageType = '学习记录';
            addLog(`检测到${pageType}页面，不展现脚本面板`, 'info');
            return;
        }


        const isCourseDetailPage = () => {

            if (currentUrl.includes('/mooc2-ans/mycourse/stu') ||
                currentUrl.includes('/mycourse/studentcourse') ||
                currentUrl.includes('course/') && !currentUrl.includes('knowledge')) {


                const hasNavigationMenu = document.querySelector('.nav-content ul, .stuNavigationList ul');
                const hasModuleLinks = document.querySelectorAll('a[title="章节"], a[title="作业"], a[title="考试"], a[title="资料"]').length >= 3;


                const hasCourseInfo = document.querySelector('.classDl, .sideCon, .nav_side');


                const hasCourseId = document.querySelector('#courseid, input[name="courseid"]');

                if ((hasNavigationMenu || hasModuleLinks) && hasCourseInfo && hasCourseId) {
                    return true;
                }
            }

            return false;
        };

        if (isCourseDetailPage()) {
            addLog('检测到课程详情页面，不展现脚本面板', 'info');
            return;
        }


        const isChapterListPage = () => {

            const hasChapterList = document.querySelector('.fanyaChapter, .chapter_body, .xs_table');
            const hasChapterItems = document.querySelectorAll('.chapter_unit, .chapter_item').length > 0;
            const hasChapterStructure = document.querySelector('.chapter_th, .chapter_td');
            const hasProgressInfo = document.querySelector('.catalog_points_yi, .chapter_head');
            const hasSearchBox = document.querySelector('#searchChapterListByName, .dataSearch');


            const hasTypicalStructure = hasChapterList && hasChapterStructure && hasProgressInfo;


            const hasChapterTitles = document.querySelectorAll('.catalog_name, .newCatalog_name').length > 2;


            const urlIndicatesChapterList = currentUrl.includes('/mycourse/studentcourse') ||
                                           currentUrl.includes('/studentstudy') && !currentUrl.includes('chapterId=');


            const hasNoLearningContent = !document.querySelector('video, .video-js, iframe[src*="chaoxing"], .questionLi, .TiMu');

            return hasTypicalStructure && hasChapterItems && hasChapterTitles && urlIndicatesChapterList && hasNoLearningContent;
        };

        if (isChapterListPage()) {
            addLog('检测到章节列表页面，不展现脚本面板', 'info');
            return;
        }


        if (!hasQuestions() && !hasStudyContentDeep() && !isStudyPage()) {
            showNoTaskToast();
            return;
        }


        if (!claimOwnership()) {
            return;
        }

        createdPanelEl = createPanel();
        bindPanelEvents();
        startHeartbeat();


        const answeringState = getAnsweringState();
        if (answeringState) {
            addLog('检测到答题状态，自动继续答题...', 'info');

            setTimeout(() => {
                autoAnswer();
            }, 1500);
        }
    }


    // 跨域接力：任何 frame 每 3 秒检查一次会话，必要时自己接管刷章节
    setInterval(function() {
        try { tryAdoptStudySession(); } catch(e) {}
    }, 3000);

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', init);
    } else {
        init();
    }


    function isQuizPageDoc(doc) {
        try {
            if (doc.getElementById('form1') && doc.querySelector('#RightCon .newTestTitle')) return true;
            if (doc.querySelector('.newTestCon form#form1') && doc.querySelector('.ans-cc')) return true;
            if (doc.querySelector('#form1 input[id^="answertype"]')) return true;
            if (doc.querySelector('.TiMu, .singleQuesId, .Zy_TItle, ul.Zy_ulTop')) return true;
        } catch {}
        return false;
    }


    function collectQuizQuestions(doc) {
        const questions = [];
        try {

            const typeInputs = doc.querySelectorAll('input[id^="answertype"]');
            typeInputs.forEach((inp) => {
                try {
                    const id = inp.id.replace('answertype', '');
                    const qid = id.trim();
                    const block = doc.querySelector(`.singleQuesId[data="${qid}"]`) || inp.closest('.TiMu') || doc;
                    const typeVal = (inp.value || '').trim();
                    let type = '';
                    if (typeVal === '0') type = 'single';
                    else if (typeVal === '1') type = 'multiple';
                    else if (typeVal === '3') type = 'judge';
                    else if (typeVal === '2') type = 'blank';
                    else if (typeVal === '4') type = 'short';
                    else {
                        const hasTextInput = block.querySelector('input[type="text"], textarea, [contenteditable="true"], [id^="answerEditor"], iframe[id^="ueditor_"]');
                        type = hasTextInput ? 'short' : 'text';
                    }

                    const opts = [];
                    const lis = block.querySelectorAll(`ul.Zy_ulTop li[onclick][qid="${qid}"]`);
                    lis.forEach((li, idx) => {
                        const span = li.querySelector('.num_option, .num_option_dx');
                        const letter = span?.getAttribute('data') || String.fromCharCode(65 + idx);
                        const txt = (li.querySelector('a.after')?.textContent || '').trim();
                        opts.push(`${letter}. ${txt}`);
                    });

                    let qtext = '';
                    const label = block.querySelector('.Zy_TItle .fontLabel');
                    if (label) qtext = label.textContent.replace(/\s+/g, ' ').trim();
                    questions.push({ qid, type, question: qtext, options: opts });
                } catch {}
            });
        } catch {}
        return questions;
    }


    function dispatchFieldEvents(el) {
        try { el.dispatchEvent(new Event('input', { bubbles: true })); } catch {}
        try { el.dispatchEvent(new Event('change', { bubbles: true })); } catch {}
        try { el.dispatchEvent(new Event('blur', { bubbles: true })); } catch {}
    }

    function getQuizDocUE(doc) {
        try {
            const win = (doc && doc.defaultView) || window;
            if (win && win.UE) return win.UE;
        } catch {}
        try {
            if (typeof UE !== 'undefined') return UE;
        } catch {}
        return null;
    }

    async function waitForQuizEditorInstance(doc, editorId, timeoutMs = 5000) {
        const end = Date.now() + timeoutMs;
        while (Date.now() < end) {
            try {
                const UERef = getQuizDocUE(doc);
                if (UERef && typeof UERef.getEditor === 'function') {
                    const editor = UERef.getEditor(editorId);
                    if (editor) return editor;
                }
            } catch {}
            await new Promise(r => setTimeout(r, 120));
        }
        return null;
    }

    async function waitForUeEditorReady(editor, timeoutMs = 4000) {
        if (!editor) return false;
        try {
            if (editor.isReady) return true;
        } catch {}
        return await new Promise((resolve) => {
            let done = false;
            const finish = (ok) => {
                if (done) return;
                done = true;
                resolve(!!ok);
            };
            try {
                if (typeof editor.ready === 'function') {
                    editor.ready(() => finish(true));
                }
            } catch {}
            setTimeout(() => {
                try {
                    finish(!!editor.isReady);
                } catch {
                    finish(false);
                }
            }, timeoutMs);
        });
    }

    async function prewarmQuizEditors(doc) {
        try {
            const areas = Array.from(doc.querySelectorAll('[id^="answerEditor"]'));
            if (!areas.length) return;
            for (let i = 0; i < areas.length; i++) {
                const area = areas[i];
                const editor = await waitForQuizEditorInstance(doc, area.id, 5000);
                if (!editor) {
                    addLog(`编辑器未就绪：${area.id}`, 'warning');
                    continue;
                }
                const ready = await waitForUeEditorReady(editor, 5000);
                if (!ready) {
                    addLog(`编辑器初始化超时：${area.id}`, 'warning');
                    continue;
                }
                if (i === 0) await new Promise(r => setTimeout(r, 150));
            }
            const body = doc.body;
            if (body && body.dataset.cxQuizEditorWarmDelayDone !== '1') {
                await new Promise(r => setTimeout(r, 3000));
                body.dataset.cxQuizEditorWarmDelayDone = '1';
            }
        } catch (e) {
            addLog(`预热章节测验编辑器失败: ${e.message}`, 'warning');
        }
    }

    async function setQuizEditorValue(doc, textareaEl, value) {
        const val = String(value || '').trim();
        if (!textareaEl || !val) return false;
        let done = false;
        const UERef = getQuizDocUE(doc);

        try {
            if (UERef && typeof UERef.getEditor === 'function') {
                const editor = await waitForQuizEditorInstance(doc, textareaEl.id, 5000);
                if (editor) {
                    const ready = await waitForUeEditorReady(editor, 4500);
                    if (ready) {
                        editor.setContent(val);
                        try { if (typeof editor.fireEvent === 'function') editor.fireEvent('contentChange'); } catch {}
                        try { if (typeof editor.fireEvent === 'function') editor.fireEvent('selectionchange'); } catch {}
                        done = true;
                    } else {
                        addLog(`编辑器未 ready，转为普通回填：${textareaEl.id}`, 'warning');
                    }
                } else {
                    addLog(`未找到编辑器实例，转为普通回填：${textareaEl.id}`, 'warning');
                }
            }
        } catch (e) {
            addLog(`编辑器写入失败，转为普通回填：${e.message}`, 'warning');
        }

        try {
            textareaEl.value = val;
            dispatchFieldEvents(textareaEl);
            done = true;
        } catch (e) {
            addLog(`textarea 回填失败：${e.message}`, 'warning');
        }

        try {
            const ifr = textareaEl.parentElement?.querySelector('iframe[id^="ueditor_"]')
                || textareaEl.closest('.subEditor, .eidtDiv, .divText, .textDIV, .editor')?.querySelector('iframe[id^="ueditor_"]')
                || doc.querySelector(`iframe[id^="ueditor_"][id*="${textareaEl.id.replace(/[^\w-]/g, '')}"]`);
            const iframeDoc = ifr && (ifr.contentDocument || ifr.contentWindow?.document);
            const body = iframeDoc && iframeDoc.body;
            if (body) {
                body.innerHTML = val;
                dispatchFieldEvents(body);
                done = true;
            }
        } catch (e) {
            addLog(`iframe 编辑区回填失败：${e.message}`, 'warning');
        }

        if (!done) addLog(`编辑器内容写入失败：${textareaEl.id}`, 'error');
        return done;
    }

    async function fillQuizAnswer(doc, qid, type, answer) {
        try {
            const block = doc.querySelector(`.singleQuesId[data="${qid}"]`) || doc;
            if (!block) return false;
            if (type === 'single' || type === 'multiple' || type === 'judge') {
                let letters = [];
                if (type === 'multiple') {
                    letters = (answer || '').toUpperCase().split(/[,，、\s]+/).filter(Boolean);
                } else if (type === 'judge') {
                    const val = String(answer || '').trim().toLowerCase();

                    if (/^a$|对|true|正确/.test(val)) letters = ['A'];
                    else if (/^b$|错|false|错误/.test(val)) letters = ['B'];
                    else if (/^t$/.test(val)) letters = ['A'];
                    else if (/^f$/.test(val)) letters = ['B'];
                    else letters = [(val.match(/[ab]/i) || ['A'])[0].toUpperCase()];
                } else {
                    const m = String(answer || '').toUpperCase().match(/[A-Z]/g);
                    letters = m ? m : [];
                }

                const ul = block.querySelector('ul.Zy_ulTop');
                if (!ul) return false;


                letters.forEach((L) => {
                    let target = null;
                    if (type === 'judge') {

                        const dataVal = (L === 'A') ? 'true' : 'false';
                        target = ul.querySelector(`li .num_option[data='${dataVal}'], li .num_option_dx[data='${dataVal}']`)
                              || ul.querySelector(`li .num_option[data='${L}'], li .num_option_dx[data='${L}']`);
                    } else {
                        target = ul.querySelector(`li .num_option[data='${L}'], li .num_option_dx[data='${L}']`);
                    }
                    if (target) {
                        const li = target.closest('li');
                        safeClick(li);
                    }
                });


                const hidden = doc.getElementById(`answer${qid}`);
                if (hidden) {
                    const want = (type === 'judge')
                        ? (letters[0] === 'A' ? 'true' : 'false')
                        : letters.join('');

                    if (!hidden.value || (type !== 'multiple' && hidden.value.toLowerCase() !== want)) {
                        hidden.value = want;

                        const spans = ul.querySelectorAll(`.choice${qid}`);
                        spans.forEach(s => s.classList.remove('check_answer', 'check_answer_dx'));
                        letters.forEach((L) => {
                            let sel = null;
                            if (type === 'judge') {
                                const dv = (L === 'A') ? 'true' : 'false';
                                sel = ul.querySelector(`.choice${qid}[data='${dv}']`) || ul.querySelector(`.choice${qid}[data='${L}']`);
                            } else {
                                sel = ul.querySelector(`.choice${qid}[data='${L}']`);
                            }
                            if (sel) {
                                const isMulti = !!ul.querySelector('.num_option_dx');
                                sel.classList.add(isMulti ? 'check_answer_dx' : 'check_answer');
                                const li = sel.closest('li');
                                if (li) {
                                    li.setAttribute('aria-checked', 'true');
                                    li.setAttribute('aria-pressed', 'true');
                                }
                            }
                        });
                    }
                }
                return true;
            }
            else if (type === 'blank') {

                const answers = String(answer || '').split(/[,，;；、]\s*/).map(s => s.trim()).filter(Boolean);

                const ueAreas = Array.from(block.querySelectorAll('[id^="answerEditor"]'));
                for (let i = 0; i < ueAreas.length; i++) {
                    const ta = ueAreas[i];
                    const val = answers[i] || '';
                    if (!val) continue;
                    await setQuizEditorValue(doc, ta, val);
                    if (i === 0) await new Promise(r => setTimeout(r, 120));
                }

                const ifrs = block.querySelectorAll('iframe[id^="ueditor_"]');
                ifrs.forEach((ifr, i) => {
                    const val = answers[i] || '';
                    if (!val) return;
                    try {
                        const d = ifr.contentDocument || ifr.contentWindow?.document;
                        const body = d && d.body;
                        if (body) {
                            body.innerHTML = val;
                            dispatchFieldEvents(body);
                        }
                    } catch {}
                });

                const inputs = [
                    ...block.querySelectorAll('input[type="text"]'),
                    ...block.querySelectorAll('textarea:not([id^="answerEditor"])')
                ];
                inputs.forEach((el, i) => {
                    const val = answers[i] || '';
                    if (!val) return;
                    try {
                        const tag = (el.tagName || '').toLowerCase();
                        if (tag === 'input' || tag === 'textarea') {
                            el.value = val;
                            dispatchFieldEvents(el);
                        }
                    } catch {}
                });

                const hidden = doc.getElementById(`answer${qid}`);
                if (hidden) hidden.value = answers.join(' ');
                return true;
            }
            else if (type === 'text' || type === 'short' || type === 'essay' || type === 'writing') {

                const val = String(answer || '').trim();
                if (!val) return false;

                const ueAreas = Array.from(block.querySelectorAll('[id^="answerEditor"]'));
                for (let i = 0; i < ueAreas.length; i++) {
                    const ta = ueAreas[i];
                    await setQuizEditorValue(doc, ta, val);
                    if (i === 0) await new Promise(r => setTimeout(r, 120));
                }

                const ifrs = block.querySelectorAll('iframe[id^="ueditor_"]');
                ifrs.forEach((ifr) => {
                    try {
                        const d = ifr.contentDocument || ifr.contentWindow?.document;
                        const body = d && d.body;
                        if (body) {
                            body.innerHTML = val;
                            dispatchFieldEvents(body);
                        }
                    } catch {}
                });

                const inputs = [
                    ...block.querySelectorAll('textarea:not([id^="answerEditor"])'),
                    ...block.querySelectorAll('input[type="text"]')
                ];
                inputs.forEach((el) => {
                    try {
                        const tag = (el.tagName || '').toLowerCase();
                        if (tag === 'input' || tag === 'textarea') {
                            el.value = val;
                            dispatchFieldEvents(el);
                        }
                    } catch {}
                });

                const hidden = doc.getElementById(`answer${qid}`);
                if (hidden) hidden.value = val;
                return true;
            }
            return false;
        } catch { return false; }
    }


    function findAndClickQuizSubmitButton(doc) {
        try {
            const targetWindow = doc.defaultView || window;


            const chaoxingSubmitMethods = [

                () => {
                    if (typeof targetWindow.btnBlueSubmit === 'function') {
                        targetWindow.btnBlueSubmit();
                        return true;
                    }
                    return false;
                },

                () => {
                    if (typeof targetWindow.submitCheckTimes === 'function') {
                        targetWindow.submitCheckTimes();
                        return true;
                    }
                    return false;
                },

                () => {
                    if (typeof targetWindow.submitWork === 'function') {
                        targetWindow.submitWork();
                        return true;
                    }
                    return false;
                },

                () => {
                    const forms = doc.querySelectorAll('form');
                    for (const form of forms) {
                        const formAction = form.action || '';
                        if (formAction.includes('work') || formAction.includes('quiz') || formAction.includes('submit')) {
                            try {
                                form.submit();
                                return true;
                            } catch (e) {
                                addLog(`提交失败: ${e.message}`, 'error');
                            }
                        }
                    }
                    return false;
                }
            ];


            for (const method of chaoxingSubmitMethods) {
                try {
                    if (method()) return true;
                } catch (e) {
                    addLog(`提交失败: ${e.message}`, 'error');
                }
            }


            const submitSelectors = [
                'input[type="submit"][value*="提交"]',
                'button[type="submit"]',
                'input[value="提交答案"]',
                'input[value="提交"]',
                'button[onclick*="submit"]',
                'button[onclick*="btnBlueSubmit"]',
                'button[onclick*="submitCheckTimes"]',
                '.submit-btn',
                '.btn-submit',
                '#submit',
                '.submit',
                'input[id*="submit"]',
                'button[id*="submit"]',
                'a[onclick*="submit"]',
                'input[onclick*="tijiao"]',
                'button[onclick*="tijiao"]'
            ];

            for (const selector of submitSelectors) {
                const submitBtn = doc.querySelector(selector);
                if (submitBtn && !submitBtn.disabled && !submitBtn.classList.contains('disabled')) {
                    try {

                        const onclick = submitBtn.getAttribute('onclick');
                        if (onclick) {
                            try {

                                const func = new targetWindow.Function(onclick);
                                func.call(submitBtn);
                                return true;
                            } catch (e) {
                                addLog(`提交失败: ${e.message}`, 'error');
                            }
                        }


                        if (safeClick(submitBtn)) {
                            return true;
                        }
                    } catch (e) {
                        addLog(`提交失败: ${e.message}`, 'error');
                    }
                }
            }


            const clickableElements = Array.from(doc.querySelectorAll('input, button, a, span, div'));
            for (const el of clickableElements) {
                const text = (el.textContent || el.value || '').trim();
                if (/^(提交|提交答案|完成|确认提交)$/.test(text)) {
                    try {
                        const onclick = el.getAttribute('onclick');
                        if (onclick) {
                            try {
                                const func = new targetWindow.Function(onclick);
                                func.call(el);
                                return true;
                            } catch (e) {
                                addLog(`提交失败: ${e.message}`, 'error');
                            }
                        }

                        if (safeClick(el)) {
                            return true;
                        }
                    } catch (e) {
                        addLog(`提交失败: ${e.message}`, 'error');
                    }
                }
            }

            addLog('未找到章节测验提交按钮', 'error');
            return false;
        } catch (e) {
            addLog(`查找提交按钮失败: ${e.message}`, 'error');
            return false;
        }
    }


    function validateAndFixSubmitParams(doc) {
        try {
            const targetWindow = doc.defaultView || window;


            if (typeof targetWindow.workRelationId === 'undefined') {

                const workIdInputs = doc.querySelectorAll('input[name*="workRelationId"], input[id*="workRelationId"]');
                if (workIdInputs.length > 0) {
                    targetWindow.workRelationId = workIdInputs[0].value;
                }
            }


            if (typeof targetWindow.courseId === 'undefined') {
                const courseIdInputs = doc.querySelectorAll('input[name*="courseId"], input[id*="courseId"]');
                if (courseIdInputs.length > 0) {
                    targetWindow.courseId = courseIdInputs[0].value;
                }
            }


            if (typeof targetWindow.classId === 'undefined') {
                const classIdInputs = doc.querySelectorAll('input[name*="classId"], input[id*="classId"]');
                if (classIdInputs.length > 0) {
                    targetWindow.classId = classIdInputs[0].value;
                }
            }


            const questions = doc.querySelectorAll('[class*="TiMu"], [class*="timu"]');
            questions.forEach((q, index) => {
                const qid = q.getAttribute('id') || `question_${index}`;
                let answerInput = doc.querySelector(`input[name="answer${qid}"], input[id="answer${qid}"]`);

                if (!answerInput) {

                    answerInput = doc.createElement('input');
                    answerInput.type = 'hidden';
                    answerInput.name = `answer${qid}`;
                    answerInput.id = `answer${qid}`;
                    q.appendChild(answerInput);
                }
            });

            addLog('提交参数验证完成', 'info');
            return true;
        } catch (e) { addLog(`提交参数检查失败: ${e.message}`, 'error'); return false; }
    }


    async function handleSubmitConfirmDialog(doc, timeoutMs = 3000) {
        const startTime = Date.now();

        while (Date.now() - startTime < timeoutMs) {
            try {

                const confirmDialogSelectors = [
                    '.popDiv', '.modal', '.dialog', '.alert',
                    '.layui-layer', '.confirm-dialog', '.submit-confirm',
                    '[class*="confirm"]', '[class*="dialog"]', '[class*="modal"]'
                ];

                for (const selector of confirmDialogSelectors) {
                    const dialog = doc.querySelector(selector);
                    if (dialog && dialog.style.display !== 'none' &&
                        (dialog.textContent.includes('确认提交') ||
                         dialog.textContent.includes('提交') ||
                         dialog.textContent.includes('确定'))) {

                        const confirmButtonSelectors = [
                            'button[onclick*="submit"]', 'button[value*="提交"]',
                            'button[value*="确定"]', 'button[value*="确认"]',
                            'input[type="button"][value*="提交"]',
                            'input[type="button"][value*="确定"]',
                            'input[type="button"][value*="确认"]',
                            '.confirm-btn', '.submit-btn', '.ok-btn',
                            'button:contains("提交")', 'button:contains("确定")',
                            'button:contains("确认")', 'a[onclick*="submit"]'
                        ];


                        for (const btnSelector of confirmButtonSelectors) {
                            const confirmBtn = dialog.querySelector(btnSelector) ||
                                             doc.querySelector(`${selector} ${btnSelector}`);

                            if (confirmBtn && !confirmBtn.disabled) {
                                try {

                                    const onclick = confirmBtn.getAttribute('onclick');
                                    if (onclick) {
                                        const targetWindow = doc.defaultView || window;
                                        const func = new targetWindow.Function(onclick);
                                        func.call(confirmBtn);
                                        return true;
                                    }


                                    if (safeClick(confirmBtn)) {
                                        return true;
                                    }
                                } catch (e) {
                                    addLog(`确认提交失败: ${e.message}`, 'error');
                                }
                            }
                        }


                        const allButtons = dialog.querySelectorAll('button, input[type="button"], a');
                        for (const btn of allButtons) {
                            const text = (btn.textContent || btn.value || '').trim();
                            if (/^(提交|确定|确认|OK)$/.test(text)) {
                                try {
                                    if (safeClick(btn)) {
                                        return true;
                                    }
                                } catch (e) {
                                    addLog(`确认提交失败: ${e.message}`, 'error');
                                }
                            }
                        }
                    }
                }
            } catch (e) {

            }

            await new Promise(r => setTimeout(r, 200));
        }

        return false;
    }


    async function waitForQuizSubmitCompletion(doc, timeoutMs = 5000) {
        const startTime = Date.now();
        const originalUrl = doc.location.href;

        while (Date.now() - startTime < timeoutMs) {
            try {

                const successIndicators = [
                    '.success', '.alert-success', '.msg-success',
                    '[class*="success"]', '[class*="complete"]',
                    '*[text()*="提交成功"]', '*[text()*="完成"]'
                ];

                for (const selector of successIndicators) {
                    const indicator = doc.querySelector(selector);
                    if (indicator && indicator.textContent.includes('成功')) {
                        return true;
                    }
                }


                if (doc.location.href !== originalUrl) {
                    return true;
                }


                const nextStepSelectors = [
                    'button[onclick*="next"]', 'a[onclick*="next"]',
                    'input[value*="下一"]', 'button[value*="下一"]',
                    '.next-btn', '.btn-next', '#next'
                ];

                for (const selector of nextStepSelectors) {
                    if (doc.querySelector(selector)) {
                        return true;
                    }
                }

            } catch (e) {

            }

            await new Promise(r => setTimeout(r, 200));
        }

        addLog('章节测验提交等待超时', 'error');
        return false;
    }


    async function autoAnswerQuizInDocument(doc) {
        try {
            if (!isStudyingChapters) return false;
            if (!isQuizPageDoc(doc)) return false;
            if (isQuizEffectivelyCompletedDoc(doc)) {
                markChapterQuizHandledForCurrentSection();
                return true;
            }

            await injectConsoleDecryptCode(doc);
            await prewarmQuizEditors(doc);
            const qs = collectQuizQuestions(doc);
            if (!qs || qs.length === 0) {
                if (isQuizEffectivelyCompletedDoc(doc)) {
                    markChapterQuizHandledForCurrentSection();
                    return true;
                }
                return false;
            }
            addLog('正在自动完成章节测验...', 'info');


            for (const q of qs) {
                if (!isStudyingChapters) return false;
                const promptInfo = { type: q.type, question: q.question || `题目 ${q.qid}`, options: q.options || [] };
                const ans = await getAnswer(promptInfo);
                if (ans) {
                    await fillQuizAnswer(doc, q.qid, q.type, ans);
                }
                await new Promise(r => setTimeout(r, 1000));
            }

            addLog('章节测验答题完成，正在提交...', 'success');


            await new Promise(r => setTimeout(r, 1000));


            validateAndFixSubmitParams(doc);


            let submitSuccess = false;
            const targetWindow = doc.defaultView || window;


            try {

                const originalAlert = targetWindow.alert;
                targetWindow.alert = function(msg) {
                    if (msg && msg.includes('code-1')) {
                        return;
                    }
                    return originalAlert.call(this, msg);
                };


                if (typeof targetWindow.btnBlueSubmit === 'function') {
                    targetWindow.btnBlueSubmit();
                    await new Promise(r => setTimeout(r, 1000));


                    if (typeof targetWindow.submitCheckTimes === 'function') {
                        targetWindow.submitCheckTimes();
                    }


                    if (typeof targetWindow.noSubmit === 'function') {}

                    submitSuccess = true;
                } else if (typeof targetWindow.submitWork === 'function') {
                    targetWindow.submitWork();
                    submitSuccess = true;
                } else {

                    submitSuccess = findAndClickQuizSubmitButton(doc);
                }


            } catch (e) {
                addLog(`提交流程执行失败: ${e.message}`, 'error');

                submitSuccess = findAndClickQuizSubmitButton(doc);
            }

            if (submitSuccess) {
                await new Promise(r => setTimeout(r, 500));


                const confirmHandled = await handleSubmitConfirmDialog(doc, 3000);
                if (confirmHandled) {}

                const submitCompleted = await waitForQuizSubmitCompletion(doc, 8000);
                if (submitCompleted) {
                    addLog('章节测验提交完成，准备跳转下一节...', 'success');
                    markChapterQuizHandledForCurrentSection();


                    await new Promise(r => setTimeout(r, 2000));


                    if (isStudyingChapters) {
                        addLog('章节测验提交完成，准备跳转下一节', 'success');
                        scheduleSkipChapter(2000);
                    }
                } else {
                    markChapterQuizHandledForCurrentSection();

                    await new Promise(r => setTimeout(r, 1500));
                    if (isStudyingChapters) {
                        addLog('章节测验已提交，准备跳转', 'info');
                        scheduleSkipChapter(1500);
                    }
                }
            } else {
                markChapterQuizHandledForCurrentSection();

                await new Promise(r => setTimeout(r, 1000));
                if (isStudyingChapters) {
                    addLog('章节测验处理完成，准备跳转', 'info');
                    scheduleSkipChapter(1500);
                }
            }

            return true;
        } catch (e) {

            return false;
        }
    }
})();