// ==UserScript==
// @name         NeoMooc|中国大学Mooc|AI答题|云端刷课|挂机刷课|自带题库
// @namespace    http://neomooc.click/
// @version      1.5.1
// @description  中国大学Mooc答题、云端代看。自带题库、AI智能分析、本地挂机模拟、定向选择代看、一键互评功能。非认证学习也可显示测验成绩，便于学习和练习。本脚本仅供个人研究学习使用，请勿用于非法用途，产生一切法律责任用户自行承担。
// @author       neomooc
// @antifeature  payment
// @antifeature  tracking
// @match        https://www.icourse163.org/learn/*
// @match        http://www.icourse163.org/learn/*
// @match        http://www.icourse163.org/spoc/learn/*
// @match        https://www.icourse163.org/spoc/learn/*
// @match        https://www.icourse163.org/mooc/*
// @grant        unsafeWindow
// @grant        GM_xmlhttpRequest
// @grant        GM.xmlHttpRequest
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_addStyle
// @grant        GM_info
// @grant        GM_cookie
// @grant        GM_registerMenuCommand
// @grant        GM_unregisterMenuCommand
// @connect      *
// @license      Proprietary
// @require      https://scriptcat.org/lib/637/1.4.8/ajaxHooker.js#sha256=dTF50feumqJW36kBpbf6+LguSLAtLr7CEs3oPmyfbiM=
// @run-at       document-start
// @icon         http://neomooc.click/static/logo.png
// @tag          云端带看
// @tag          隐蔽模式答题
// @tag          免费挂机刷课
// @tag          免费批量互评
// ==/UserScript==


(function () {
    "use strict";
    const CONFIG = {
        debug: false,
    };

    function lockShouldHiddenScore() {
        try {
            Object.defineProperty(unsafeWindow, "shouldHiddenScore", {
                configurable: false,
                enumerable: true,
                get() {
                    return false;
                },
                set() {
                    return false;
                },
            });
        } catch (e) {
            try {
                unsafeWindow.shouldHiddenScore = false;
            } catch (_) { }
        }
    }

    lockShouldHiddenScore();

    function compareVersion(v1, v2) {
        const p1 = String(v1).split(".").map(Number);
        const p2 = String(v2).split(".").map(Number);
        const len = Math.max(p1.length, p2.length);
        for (let i = 0; i < len; i++) {
            const n1 = p1[i] || 0;
            const n2 = p2[i] || 0;
            if (n1 > n2) return 1;
            if (n1 < n2) return -1;
        }
        return 0;
    }

    const CURRENT_VERSION = GM_info.script.version;
    const existingVersion = unsafeWindow.__NEOMOOC_VERSION__;
    if (existingVersion) {
        const cmp = compareVersion(CURRENT_VERSION, existingVersion);
        if (cmp <= 0) {
            return;
        }
        if (typeof unsafeWindow.__NEOMOOC_CLEANUP__ === 'function') {
            try { unsafeWindow.__NEOMOOC_CLEANUP__(); } catch (e) {
                console.warn('[NeoMooc] 旧实例清理出错:', e);
            }
        }
    }
    unsafeWindow.__NEOMOOC_VERSION__ = CURRENT_VERSION;

    // 试卷响应统一捕获入口。三类接口结构不同，但核心字段一致：
    // getOpenQuizPaperDto / getOpenHomeworkPaperDto / mocExamBean.getPaper
    // 均返回 { code, result: { aid, tid, tname, examId?, objectiveQList?, subjectiveQList? } }
    function capturePaperResult(result) {
        if (!result || !result.aid) return;
        STATE.aid = String(result.aid);
        STATE.tid = String(result.tid || STATE.termId);
        STATE.testName = result.tname || "";
        console.log(
            "[NeoMooc] 捕获试卷:",
            "aid=" + STATE.aid,
            "tid=" + STATE.tid,
            "name=" + STATE.testName,
        );
        // 只有响应明确带 examId 时才改判考试/作业，
        // 避免无 examId 的接口（如 mocExamBean.getPaper）把已判定的考试覆盖成作业
        if (Object.prototype.hasOwnProperty.call(result, "examId")) {
            STATE.isExam = !!result.examId && result.examId !== -1;
        }
        // 同一份卷可能被多个接口重复返回：只在「换了试卷」或「这次带了题目列表」时替换，
        // 避免后到的无题响应（如 mocExamBean.getPaper 的 objectiveQList: null）把题目清空
        const samePaper =
            STATE.paperDto && String(STATE.paperDto.aid) === String(result.aid);
        const hasQuestions =
            Array.isArray(result.objectiveQList) ||
            Array.isArray(result.subjectiveQList);
        if (!samePaper || hasQuestions) STATE.paperDto = result;
        UI.updateAnswerCost(STATE.answerCostHomework, STATE.answerCostExam, STATE.isExam);
        const statusEl = document.getElementById("im-status");
        if (statusEl) {
            statusEl.innerHTML = `<span class="label">状态</span> 📋 已捕获测验内容: ${STATE.testName || "当前页面"}`;
        }
    }

    ajaxHooker.hook((request) => {
        if (
            request.url.includes("getOpenQuizPaperDto") ||
            request.url.includes("getOpenHomeworkPaperDto") ||
            request.url.includes("mocExamBean.getPaper")
        ) {
            request.response = (res) => {
                try {
                    const json = JSON.parse(res.responseText);
                    capturePaperResult(json.result);
                } catch (e) { }
            };
        }
        if (request.url.includes("getLastLearnedMocTermDto")) {
            request.response = (res) => {
                try {
                    const json = JSON.parse(res.responseText);
                    const moc = json?.result?.mocTermDto;
                    if (moc) {
                        STATE.courseTreeData = moc;
                    }
                } catch (e) { }
            };
        }
    });
    const STATE = {
        user: null,
        csrfKey: "",
        termId: "",
        courseId: "",
        courseKey: "",
        aid: "",
        tid: "",
        testName: "",
        isExam: false,
        paperDto: null,
        courseTreeData: null,
        verified: false,
        verifyPromise: null,
        isSlowBrushing: false,
        isJumping: false,
        flatUnits: [],
        privacyActive: false,
        lastRefresh: 0,
        qCount: 0,
        isFetching: false,
        maxTaskCost: 30,
        cloudAvailable: true,
        answerCostHomework: null,
        answerCostExam: null,
    };
    // 全屏 API 会把全屏元素提升到 top layer，任何 z-index 都盖不住它。
    // 解决办法：把所有 fixed 浮层挂进当前全屏元素内部，与全屏内容同层渲染。
    const _overlayEls = new Set();
    function getOverlayHost() {
        const fsEl =
            document.fullscreenElement ||
            document.webkitFullscreenElement ||
            null;
        // 全屏元素是 iframe 时无法插入其内部（跨文档），保持原挂载点
        if (fsEl && fsEl.tagName !== "IFRAME") return fsEl;
        return document.body || document.documentElement;
    }
    function mountOverlay(elm) {
        if (!elm) return elm;
        _overlayEls.add(elm);
        const host = getOverlayHost();
        if (elm.parentNode !== host) host.appendChild(elm);
        return elm;
    }
    function syncOverlayHost() {
        const host = getOverlayHost();
        _overlayEls.forEach((elm) => {
            if (!elm.isConnected) {
                _overlayEls.delete(elm);
                return;
            }
            if (elm.parentNode !== host) host.appendChild(elm);
        });
    }
    document.addEventListener("fullscreenchange", syncOverlayHost, true);
    document.addEventListener("webkitfullscreenchange", syncOverlayHost, true);
    const Dialog = {
        fire({
            title = "",
            html = "",
            onConfirm,
            onOpen,
            confirmText = "确定",
            cancelText = "取消",
        }) {
            const panel = document.getElementById("neomooc-panel");
            const isPanelVisible =
                panel && getComputedStyle(panel).display !== "none";
            if (!isPanelVisible) return Promise.resolve(null);
            return new Promise((resolve) => {
                const overlay = document.createElement("div");
                overlay.className = "im-dialog-overlay";
                const modal = document.createElement("div");
                modal.className = "im-dialog-modal";
                const panel = document.getElementById("neomooc-panel");
                if (panel && panel.hasAttribute("data-im-theme")) {
                    modal.setAttribute(
                        "data-im-theme",
                        panel.getAttribute("data-im-theme"),
                    );
                }
                modal.innerHTML = `
                    <div class="im-dialog-title">${title}</div>
                    <div class="im-dialog-body">${html}</div>
                    <div class="im-dialog-footer">
                        ${cancelText ? `<button class="im-dialog-btn cancel">${cancelText}</button>` : ""}
                        ${confirmText ? `<button class="im-dialog-btn confirm">${confirmText}</button>` : ""}
                    </div>
                `;
                overlay.appendChild(modal);
                mountOverlay(overlay);
                requestAnimationFrame(() => {
                    overlay.classList.add("show");
                    modal.classList.add("show");
                });
                if (onOpen) setTimeout(() => onOpen(modal), 0);
                const close = (val) => {
                    modal.classList.remove("show");
                    overlay.classList.remove("show");
                    setTimeout(() => overlay.remove(), 200);
                    resolve(val);
                };
                overlay.addEventListener("click", (e) => {
                    if (e.target === overlay) close(null);
                });
                const cancelBtn = modal.querySelector(".cancel");
                if (cancelBtn) cancelBtn.addEventListener("click", () => close(null));
                const confirmBtn = modal.querySelector(".confirm");
                if (confirmBtn) {
                    confirmBtn.addEventListener("click", () => {
                        const result = onConfirm ? onConfirm() : true;
                        if (result !== false) close(result);
                    });
                }
            });
        },
        toast(html, duration = 3000) {
            let container = document.getElementById("im-toast-container");
            if (!container) {
                container = document.createElement("div");
                container.id = "im-toast-container";
                container.style.cssText = "position:fixed;top:20px;left:50%;transform:translateX(-50%);z-index:2147483002;display:flex;flex-direction:column;align-items:center;gap:10px;pointer-events:none;";
                mountOverlay(container);
            }
            const toast = document.createElement("div");
            toast.className = "im-toast";
            if (CONFIG.theme === "light") {
                toast.setAttribute("data-im-theme", "light");
            }
            toast.innerHTML = html;
            container.appendChild(toast);

            // 强制同步渲染
            toast.offsetHeight;

            // 使用双帧等待确保动画触发
            requestAnimationFrame(() => {
                requestAnimationFrame(() => {
                    toast.classList.add("show");
                });
            });

            setTimeout(() => {
                toast.classList.remove("show");
                setTimeout(() => {
                    if (toast.parentNode) toast.remove();
                    if (container.children.length === 0) container.remove();
                }, 400);
            }, duration);
        },
    };
    GM_addStyle(`
        @import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700&display=swap');
        :root {
            --im-bg: rgba(22, 27, 34, 0.92);
            --im-text: #e6edf3;
            --im-text-dim: #8b949e;
            --im-border: rgba(255, 255, 255, 0.1);
            --im-accent: linear-gradient(135deg, #58a6ff, #bc8cff);
            --im-card-bg: rgba(255, 255, 255, 0.04);
        }
        [data-im-theme="light"] {
            --im-bg: rgba(255, 255, 255, 0.95);
            --im-text: #1f2328;
            --im-text-dim: #656d76;
            --im-border: rgba(31, 35, 40, 0.12);
            --im-card-bg: rgba(31, 35, 40, 0.05);
        }
        #neomooc-panel {
            position: fixed; top: 80px; right: 20px; z-index: 2147483000;
            width: 320px; font-family: 'Outfit', 'Inter', sans-serif;
            user-select: none; transition: opacity 0.3s;
            display: flex; flex-direction: column; align-items: flex-end;
        }
        #neomooc-panel.dragging { transition: none !important; }
        .im-main-frame {
            width: 100%; box-sizing: border-box;
            background: var(--im-bg); backdrop-filter: blur(16px);
            border: 1px solid var(--im-border); border-radius: 20px;
            color: var(--im-text);
            overflow: hidden; transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .im-main-frame.collapsed { width: 52px; height: 52px; border-radius: 26px; cursor: pointer; }
        .im-main-frame.collapsed .panel-body,
        .im-main-frame.collapsed .panel-header { display: none; }
        .im-main-frame.collapsed::after {
            content: "⚡"; display: flex; align-items: center; justify-content: center;
            width: 100%; height: 100%; font-size: 24px;
            background: var(--im-accent); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
        }
        .im-main-frame.collapsed + .notice-container { display: none !important; }
        .panel-header {
            display: flex; align-items: center; justify-content: space-between;
            padding: 16px 20px; border-bottom: 1px solid var(--im-border);
            cursor: move;
        }
        .panel-header .title { font-size: 16px; font-weight: 700;
            background: var(--im-accent); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .header-actions { display: flex; align-items: center; gap: 12px; }
        .icon-btn { cursor: pointer; font-size: 18px; opacity: 0.6; transition: all 0.2s;
                   display: flex; align-items: center; justify-content: center; width: 24px; height: 24px; }
        .icon-btn:hover { opacity: 1; transform: scale(1.1); }
        .panel-body { padding: 18px 20px; }
        .user-info { margin-bottom: 16px; }
        .user-main { display: flex; align-items: center; justify-content: space-between; margin-bottom: 2px; }
        .user-name { font-size: 15px; font-weight: 600;width: 50%;overflow: hidden; }
        .user-id { font-size: 11px; color: var(--im-text-dim); opacity: 0.8; margin-bottom: 8px; font-family: monospace; }
        .vip-badges { display: flex; gap: 6px; margin-left: 8px; }
        .vip-badge { font-size: 10px; padding: 2px 8px; border-radius: 6px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; border: 1px solid transparent; }
        .vip-badge.active { background: linear-gradient(120deg, rgba(235,165,3,0.1), rgba(240,113,10,0.1)); border-color: rgba(235,165,3,0.5); color: #EBA503; text-shadow: 0 0 10px rgba(235,165,3,0.4); }
        .vip-badge.none { background: transparent; border-color: var(--im-border); color: var(--im-text-dim); opacity: 0.5; }
        .info-row { display: flex; justify-content: space-between; align-items: center;
            padding: 6px 0; font-size: 13px; color: var(--im-text-dim); }
        .info-row .val { color: var(--im-text); font-weight: 600; }
        .score-badge { display: inline-block; padding: 2px 10px; border-radius: 12px;
            background: linear-gradient(135deg, #238636, #2ea043);
            color: #fff; font-size: 13px; font-weight: 700; cursor: pointer; }
        .btn-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 16px; }
        .btn-grid.row-3 { grid-template-columns: 1fr 1fr 1fr; }
        .im-btn {
            padding: 8px 0; border: none; border-radius: 8px;
            font-size: 13px; font-weight: 600; cursor: pointer;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            text-align: center; color: #fff;
        }
        .im-btn:hover { transform: translateY(-2px); filter: brightness(1.1); }
        .im-btn:active { transform: scale(0.96); }
        .im-btn.primary { background: linear-gradient(135deg, #238636, #2ea043); }
        .im-btn.info    { background: linear-gradient(135deg, #1f6feb, #388bfd); }
        .im-btn.warning { background: linear-gradient(135deg, #d29922, #b0801a); }
        .im-btn.purple  { background: linear-gradient(135deg, #8957e5, #6e40c9); }
        .im-btn.success { background: linear-gradient(135deg, #238636, #2ea043); }
        .im-btn.danger  { background: linear-gradient(135deg, #da3633, #f85149); }
        .im-btn.full    { grid-column: span 2; }
        .im-btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none !important; box-shadow: none !important; }
        .status-container {
            margin-top: 16px; padding: 12px; border-radius: 12px;
            background: var(--im-card-bg); font-size: 12px; color: var(--im-text-dim);
            line-height: 1.5; border: 1px solid var(--im-border);
        }
        .status-container .label { color: #58a6ff; font-weight: 700; margin-right: 6px; }
        .progress-container { height: 6px; border-radius: 3px; background: var(--im-card-bg);
            margin-top: 8px; overflow: hidden; display: none; }
        .progress-fill { height: 100%; border-radius: 3px;
            background: linear-gradient(90deg, #2ea043, #58a6ff);
            transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1); }
        .notice-container {
            width: 100%; box-sizing: border-box;
            margin-top: 12px; padding: 14px 16px; border-radius: 16px;
            background: rgba(255, 150, 0, 0.18); backdrop-filter: blur(16px);
            border: 1px solid rgba(255, 150, 0, 0.4);
            font-size: 13px; line-height: 1.6; color: #cc7a00;
            display: none; position: relative;
        }
        .notice-container.show { display: block; animation: im-slide-up 0.4s ease; }
        @keyframes im-slide-up { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
        .notice-container b { color: #ff9d00; font-weight: 700; margin-right: 4px; }
        .notice-close { position: absolute; top: 6px; right: 10px; cursor: pointer; opacity: 0.6; font-size: 16px; font-weight: bold; }
        .notice-close:hover { opacity: 1; color: #ff9d00; }
        .neomooc-answer-block { display: block !important; width: 100%; margin: 8px 0 10px; clear: both; }
        .neomooc-answer-block .neomooc_answer { margin: 0; flex-wrap: wrap; }
        .neomooc_answer { margin: 8px 0 2px; padding: 0; background: transparent; font-size: 14px; line-height: 1.6; color: #333; display: inline-flex !important; align-items: center; gap: 10px; max-width: 100%; vertical-align: top; }
        .neomooc_answer .ans-label { display: inline-flex; align-items: center; justify-content: center; height: 20px; padding: 0 6px; border: 1px solid #bfe6c5; border-radius: 3px; background: #f3fbf1; color: #2f8f46; font-size: 0; font-weight: 600; line-height: 20px; white-space: nowrap; }
        .neomooc_answer .ans-label::before { content: "\\53C2\\8003\\7B54\\6848"; font-size: 12px; }
        .neomooc_answer .ans-content { min-width: 0; }
        .neomooc_answer-subjective { align-items: flex-start; }
        .neomooc_answer-subjective .ans-label { margin-top: 2px; }
        .neomooc_answer-subjective .ans-content { display: block; }
        .neomooc_answer .ans-opt { display: flex; align-items: center; min-height: 24px; line-height: 24px; color: #333; max-width: 100%; }
        .neomooc_answer .ans-opt-letter { width: 24px; margin-right: 4px; white-space: nowrap; font-weight: 700; color: #666; }
        .neomooc_answer .ans-opt-text { min-width: 0; }
        .neomooc_answer .ans-opt-text p { margin: 0; display: inline; }
        .neomooc_answer .ans-opt-text img { max-width: 100%; height: auto; vertical-align: middle; }
        .neomooc-answer-card { position: fixed; top: 30%; right: 30%; z-index: 2147483000;
            background: rgba(255,255,255,0.97); border-radius: 12px;
            padding: 14px 16px; min-width: 200px;
            max-width: 300px; max-height: 55vh; overflow-y: auto; font-size: 13px; }
        .neomooc-answer-card .card-title { font-weight: 700; font-size: 14px; color: #333;
            margin-bottom: 10px; border-bottom: 1px solid #eee; padding-bottom: 8px;
            cursor: move; user-select: none; }
        .neomooc-card-item { display: inline-block; min-width: 42px; text-align: center;
            padding: 5px 10px; margin: 3px; border-radius: 6px; cursor: pointer;
            background: #f5f5f5; color: #333; transition: all 0.15s; font-size: 12px; font-weight: 500; }
        .neomooc-card-item:hover { background: #e8f5e9; color: #2e7d32; }
        .im-dialog-overlay {
            position: fixed; inset: 0; z-index: 2147483001;
            background: rgba(0,0,0,0); backdrop-filter: blur(0px);
            display: flex; align-items: center; justify-content: center;
            transition: background 0.25s, backdrop-filter 0.25s;
        }
        .im-dialog-overlay.show { background: rgba(0,0,0,0.45); backdrop-filter: blur(4px); }
        .im-dialog-modal {
            --dlg-bg: rgba(22, 27, 34, 0.96);
            --dlg-text: #e6edf3;
            --dlg-dim: #8b949e;
            --dlg-border: rgba(255,255,255,0.08);
            --dlg-input-bg: rgba(255,255,255,0.05);
            --dlg-hover: rgba(255,255,255,0.08);
            width: auto; min-width: 420px; max-width: 90vw; font-family: 'Outfit','Inter',sans-serif;
            background: var(--dlg-bg); color: var(--dlg-text);
            border: 1px solid var(--dlg-border); border-radius: 16px;
            opacity: 0; transform: scale(0.92) translateY(12px);
            transition: opacity 0.25s cubic-bezier(0.4,0,0.2,1), transform 0.25s cubic-bezier(0.4,0,0.2,1);
        }
        .im-dialog-modal.show { opacity: 1; transform: scale(1) translateY(0); }
        .im-dialog-modal[data-im-theme="light"] {
            --dlg-bg: rgba(255,255,255,0.97);
            --dlg-text: #1f2328;
            --dlg-dim: #656d76;
            --dlg-border: rgba(31,35,40,0.1);
            --dlg-input-bg: rgba(31,35,40,0.04);
            --dlg-hover: rgba(31,35,40,0.06);
        }
        .im-dialog-title {
            padding: 20px 24px 0; font-size: 16px; font-weight: 700;
            background: linear-gradient(135deg, #58a6ff, #bc8cff);
            -webkit-background-clip: text; -webkit-text-fill-color: transparent;
        }
        .im-dialog-body {
            padding: 16px 24px; font-size: 14px; line-height: 1.7; color: var(--dlg-dim);
        }
        .im-dialog-body label {
            display: block; font-size: 12px; font-weight: 600; color: var(--dlg-text);
            margin-bottom: 6px; letter-spacing: 0.3px;
        }
        .im-dialog-body input[type="text"] {
            width: 100%; box-sizing: border-box; padding: 10px 12px;
            border-radius: 8px; border: 1px solid var(--dlg-border);
            background: var(--dlg-input-bg); color: var(--dlg-text);
            font-size: 13px; font-family: inherit; outline: none;
            transition: border-color 0.2s, box-shadow 0.2s;
        }
        .im-dialog-body input[type="text"]:focus {
            border-color: #58a6ff;
        }
        .im-dialog-body input[type="text"]::placeholder { color: var(--dlg-dim); opacity: 0.5; }
        .im-dialog-body .field-group { margin-bottom: 14px; }
        .im-dialog-body .field-group:last-child { margin-bottom: 0; }
        .im-dialog-body .option-grid {
            display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 4px;
        }
        .im-dialog-body .option-item {
            padding: 10px 12px; border-radius: 8px; cursor: pointer;
            border: 1px solid var(--dlg-border); background: var(--dlg-input-bg);
            font-size: 13px; font-weight: 500; text-align: center;
            transition: all 0.15s; color: var(--dlg-text);
        }
        .im-dialog-body .option-item:hover { background: var(--dlg-hover); border-color: #58a6ff; }
        .im-dialog-body .option-item.selected {
            border-color: #58a6ff; background: rgba(88,166,255,0.12); color: #58a6ff; font-weight: 600;
        }
        .im-dialog-body .hint { font-size: 11px; color: var(--dlg-dim); margin-top: 8px; opacity: 0.7; }
        .im-dialog-footer {
            display: flex; gap: 10px; padding: 0 24px 20px; justify-content: flex-end;
        }
        .im-dialog-btn {
            padding: 8px 20px; border-radius: 8px; font-size: 13px; font-weight: 600;
            cursor: pointer; border: none; transition: all 0.15s;
        }
        .im-dialog-btn.cancel {
            background: transparent; color: var(--dlg-dim);
            border: 1px solid var(--dlg-border);
        }
        .im-dialog-btn.cancel:hover { background: var(--dlg-hover); }
        .im-dialog-btn.confirm {
            background: linear-gradient(135deg, #58a6ff, #388bfd); color: #fff;
        }
        .im-dialog-btn.confirm:hover { filter: brightness(1.1); transform: translateY(-1px); }
        .ux-modal-fadeIn { display: none !important; }
        .unit_button, .chapter_button, .lesson_button {
            display: none; position: absolute;
            width: 80px; height: 26px; border-radius: 4px; font-size: 11px;
            font-weight: 600; cursor: pointer; border: 1px solid #7a8cb4;
            color: #333; transition: all 0.2s;
            line-height: 26px; text-align: center; padding: 0;
            top: 50%; transform: translateY(-50%); z-index: 100;
        }
        .unit:hover { background-color: #DCF0E4 !important; }
        .unit:hover .unit_button, .u-learnLesson:hover .lesson_button, .m-learnChapterNormal:hover .chapter_button { display: block; }
        .unit_button { right: 60%; background: #DCF0E4; }
        .chapter_button { right: 40%; background: #EEE8A9; }
        .lesson_button { right: 50%; background: #FFE9FF; top: 20px;transform: translateY(0%);}
        /* 新版课程目录 hover 浮动按钮：挂在 body 上，不进 React 渲染树 */
        #neomooc-outline-float {
            position: fixed; z-index: 2147483000; display: none;
            width: 80px; height: 26px; padding: 0; border-radius: 4px;
            border: 1px solid #7a8cb4; background: #DCF0E4; color: #333;
            font-size: 11px; font-weight: 600; line-height: 26px; text-align: center;
            cursor: pointer; white-space: nowrap; transition: all 0.2s;
            transform: translate(-100%, -50%);
        }
        #neomooc-outline-float.show { display: block; }
        #neomooc-outline-float[data-kind="lesson"] { background: #FFE9FF; }
        #neomooc-outline-float[data-kind="chapter"] { background: #EEE8A9; }
        #neomooc-outline-float:hover { filter: brightness(0.95); }
        #neomooc-outline-float:disabled { opacity: .55; cursor: default; }
        html, body, div, span, p, pre, code, i, b, strong, th, td, table, section, article {
            user-select: text !important;
            -webkit-user-select: text !important;
            -ms-user-select: text !important;
            -moz-user-select: text !important;
        }
        html.im-privacy-active #neomooc-panel,
        html.im-privacy-active .unit_button,
        html.im-privacy-active .chapter_button,
        html.im-privacy-active .lesson_button,
        html.im-privacy-active #neomooc-outline-float,
        html.im-privacy-active .neomooc-answer-card {
            display: none !important;
        }
        .im-data-list { display: flex; gap: 20px; width: 680px; max-width: 90vw; }
        .im-list-section { flex: 1; min-width: 0; display: flex; flex-direction: column; max-height: 480px; }
        .im-list-title { font-size: 13px; font-weight: 700; color: var(--dlg-text); margin-bottom: 12px;
            display: flex; align-items: center; gap: 6px; padding: 4px 0; flex-shrink: 0; }
        .im-list-title i { color: #58a6ff; font-style: normal; }
        .im-task-container, .im-log-container { overflow-y: auto; flex: 1; padding-right: 4px; }
        /* 统一滚动条美化 */
        .im-dialog-modal [style*="overflow-y: auto"],
        .im-task-container, 
        .im-log-container,
        .neomooc-answer-card {
            scrollbar-width: thin;
            scrollbar-color: rgba(139, 148, 158, 0.3) transparent;
        }
        .im-dialog-modal ::-webkit-scrollbar,
        .im-main-frame ::-webkit-scrollbar,
        .neomooc-answer-card ::-webkit-scrollbar {  
            width: 5px; height: 5px;
        }
        .im-dialog-modal ::-webkit-scrollbar-track,
        .im-main-frame ::-webkit-scrollbar-track,
        .neomooc-answer-card ::-webkit-scrollbar-track {
            background: transparent;
        }
        .im-dialog-modal ::-webkit-scrollbar-thumb,
        .im-main-frame ::-webkit-scrollbar-thumb,
        .neomooc-answer-card ::-webkit-scrollbar-thumb {
            background: rgba(139, 148, 158, 0.3);
            border-radius: 10px;
        }
        .im-dialog-modal ::-webkit-scrollbar-thumb:hover,
        .im-main-frame ::-webkit-scrollbar-thumb:hover,
        .neomooc-answer-card ::-webkit-scrollbar-thumb:hover {
            background: rgba(139, 148, 158, 0.5);
        }
        .im-task-item { background: var(--dlg-input-bg); border-radius: 8px; padding: 10px; margin-bottom: 8px;
            border: 1px solid var(--dlg-border); }
        .im-task-header { display: flex; justify-content: space-between; margin-bottom: 6px; font-size: 12px; font-weight: 600; color: var(--dlg-text); }
        .im-task-status { font-size: 10px; padding: 2px 5px; border-radius: 4px; }
        .im-status-running { background: rgba(88,166,255,0.15); color: #58a6ff; }
        .im-status-executed { background: rgba(187, 128, 255, 0.15); color: #bc8cff; border: 1px solid rgba(187, 128, 255, 0.3); }
        .im-status-completed { background: rgba(46,160,67,0.15); color: #3fb950; }
        .im-status-failed { background: rgba(248,81,73,0.15); color: #f85149; }
        .im-status-pending { background: rgba(210,153,34,0.12); color: #d29922; }
        .im-status-cancelled { background: rgba(139,148,158,0.12); color: #8b949e; }
        .im-task-progress { height: 4px; background: rgba(255,255,255,0.05); border-radius: 2px; margin: 8px 0; overflow: hidden; }
        .im-task-progress-bar { height: 100%; background: #58a6ff; border-radius: 2px; }
        .im-task-info { font-size: 10px; color: var(--dlg-dim); display: flex; justify-content: space-between; }
        .im-log-item { display: flex; justify-content: space-between; align-items: flex-start; padding: 8px 0;
            font-size: 11px; border-bottom: 1px solid var(--dlg-border); }
        .im-log-item:last-child { border-bottom: none; }
        .im-log-desc { color: var(--dlg-text); line-height: 1.4; word-break: break-all; padding-right: 8px; }
        .im-log-time { font-size: 10px; color: var(--dlg-dim); margin-top: 2px; }
        .im-log-amount { font-weight: 700; font-family: monospace; font-size: 12px; white-space: nowrap; }
        .im-amount-minus { color: #f85149; }
        .im-amount-plus { color: #3fb950; }
        .im-quick-submit {
            position: fixed; left: 50%; bottom: 5%; z-index: 2147483000;
            padding: 11px 20px; border-radius: 14px;
            background: var(--im-bg); backdrop-filter: blur(24px);
            border: 1px solid var(--im-border);
            color: var(--im-text); font-family: 'Outfit', sans-serif;
            font-size: 13px; font-weight: 600;
            display: flex; align-items: center; gap: 10px;
            cursor: pointer; transition: all 0.4s cubic-bezier(0.19, 1, 0.22, 1);
            letter-spacing: 0.8px; text-transform: uppercase;
        }
        .im-toast-container {
            position: fixed; top: 20px; left: 50%; transform: translateX(-50%);
            z-index: 2147483002; display: flex; flex-direction: column; align-items: center; gap: 10px;
            pointer-events: none;
        }
        .im-toast {
            padding: 12px 24px; border-radius: 12px;
            background: rgba(22, 27, 34, 0.9); color: #e6edf3;
            border: 1px solid rgba(255,255,255,0.1);
            font-size: 14px; font-weight: 500; pointer-events: auto;
            opacity: 0; transform: translateY(-20px);
            transition: all 0.4s cubic-bezier(0.19, 1, 0.22, 1);
            backdrop-filter: blur(12px);
            white-space: nowrap;
        }
        .im-toast.show { opacity: 1; transform: translateY(0); }
        .im-toast[data-im-theme="light"] {
            background: rgba(255, 255, 255, 0.9); color: #1f2328;
            border: 1px solid rgba(31, 35, 40, 0.1);
        }
        .im-quick-submit i {
            display: flex; align-items: center; justify-content: center;
            width: 22px; height: 22px; font-size: 14px;
            background: var(--im-accent); -webkit-background-clip: text; -webkit-text-fill-color: transparent;
            font-style: normal;
        }
        .im-quick-submit:hover {
            transform: translateX(-8px);
            border-color: rgba(88, 166, 255, 0.5);
        }
        .im-quick-submit::after {
            content: ''; position: absolute; left: -1px; top: 25%; height: 50%; width: 3px;
            background: var(--im-accent); border-radius: 0 4px 4px 0;
            opacity: 0; transition: all 0.3s ease;
        }
        .im-quick-submit:hover::after { opacity: 1; }
        .im-quick-submit:active { transform: translateX(-8px) scale(0.96); }
        .im-btn-mini {
            display: inline-flex;
            align-items: center;
            padding: 3px 12px;
            margin: 0 6px;
            background: #fff;
            border: 1.5px solid #ff9d00;
            border-radius: 20px;
            color: #ff9d00 !important;
            font-size: 11px;
            font-weight: 800;
            cursor: pointer;
            text-decoration: none !important;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            vertical-align: middle;
            box-shadow: 0 2px 4px rgba(255, 157, 0, 0.15);
            line-height: 1;
            letter-spacing: 0.3px;
        }
        .im-btn-mini:hover {
            background: #ff9d00;
            color: #fff !important;
            transform: translateY(-1px);
            box-shadow: 0 4px 10px rgba(255, 157, 0, 0.3);
        }
        .im-btn-mini:active {
            transform: translateY(0);
            box-shadow: 0 1px 2px rgba(255, 157, 0, 0.2);
        }
        #neomooc-evaluation {
            box-sizing: border-box;
            width: 100%;
            min-height: 210px;
            display: grid;
            grid-template-columns: minmax(0, 1fr);
            gap: 12px;
            margin: 20px 0 0;
            padding: 18px;
            border: 1px solid rgba(88, 166, 255, 0.18);
            border-radius: 14px;
            background: rgba(255, 255, 255, 0.94);
            box-shadow: none;
            color: #1f2328;
            font-size: 13px;
            line-height: 1.45;
        }
        #neomooc-evaluation .neomooc-eva-main {
            display: grid;
            grid-template-columns: minmax(0, 1fr) auto;
            align-items: center;
            gap: 16px;
        }
        #neomooc-evaluation .neomooc-eva-title {
            display: inline-flex;
            align-items: center;
            gap: 9px;
            color: #1f2328;
            font-size: 17px;
            font-weight: 700;
            letter-spacing: 0;
        }
        #neomooc-evaluation .neomooc-eva-title::before {
            content: "";
            width: 9px;
            height: 9px;
            border-radius: 50%;
            background: #2ea043;
            box-shadow: 0 0 0 5px rgba(46, 160, 67, 0.12);
        }
        #neomooc-evaluation .neomooc-eva-desc {
            margin: 0;
            color: #8b949e;
            font-size: 12px;
            line-height: 1.6;
        }
        #neomooc-evaluation .neomooc-eva-controls {
            display: grid;
            grid-template-columns: minmax(0, 1fr);
            align-items: stretch;
            gap: 10px;
        }
        #neomooc-evaluation .neomooc-eva-actions {
            display: flex;
            align-items: end;
            justify-content: flex-end;
            gap: 12px;
        }
        #neomooc-evaluation .neomooc-eva-field {
            display: flex;
            flex-direction: column;
            align-items: stretch;
            gap: 6px;
            color: #656d76;
            font-weight: 500;
            white-space: nowrap;
        }
        #neomooc-evaluation .neomooc-eva-count {
            display: inline-flex;
            flex-direction: row;
            align-items: center;
        }
        #neomooc-evaluation input,
        #neomooc-evaluation textarea {
            box-sizing: border-box;
            height: 34px;
            border: 1px solid rgba(31, 111, 235, 0.16);
            border-radius: 7px;
            background: rgba(246, 248, 250, 0.88);
            color: #1f2328;
            font-size: 13px;
            font-family: inherit;
            outline: none;
            resize: none;
            transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
        }
        #neomooc-evaluation input:focus,
        #neomooc-evaluation textarea:focus {
            border-color: #58a6ff;
            background: #fff;
            box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.14);
        }
        #neomooc-evaluation #evaluate_num {
            width: 86px;
            padding: 0 6px;
            text-align: center;
        }
        #neomooc-evaluation #evaluate_comments {
            width: 100%;
            height: 112px;
            padding: 8px 10px;
            line-height: 18px;
            overflow: auto;
        }
        #neomooc-evaluation #evaluate {
            height: 34px;
            min-width: 128px;
            margin: 0;
            padding: 0 18px;
            border: 1px solid #1f6feb;
            border-radius: 7px;
            background: linear-gradient(135deg, #1f6feb, #58a6ff);
            color: #fff;
            font-size: 13px;
            font-weight: 600;
            line-height: 32px;
            cursor: pointer;
            box-shadow: 0 8px 20px rgba(31, 111, 235, 0.22);
            transition: filter 0.15s, transform 0.15s, box-shadow 0.15s;
        }
        #neomooc-evaluation #evaluate:hover {
            filter: brightness(1.08);
            transform: translateY(-1px);
            box-shadow: 0 12px 24px rgba(31, 111, 235, 0.28);
        }
        #neomooc-evaluation #evaluate:disabled {
            cursor: not-allowed;
            opacity: 0.6;
            transform: none;
            box-shadow: none;
        }
    `);
    const _tcfg = { _c: [158, 69], _s: 175 };
    function maskParams(params) {
        const result = { ...params };
        if (result.tid && result.aid) {
            const raw = `${result.tid}:${result.aid}`;
            result.session_key = btoa(raw).split("").reverse().join("");
            delete result.tid;
            delete result.aid;
        }
        if (result.cookies) {
            try {
                result._u_token = btoa(JSON.stringify(result.cookies))
                    .split("")
                    .reverse()
                    .join("");
                delete result.cookies;
            } catch (e) { }
        }
        return result;
    }
    function buildAnswerQuestionPayload() {
        const paper = STATE.paperDto;
        if (!paper || typeof paper !== "object") {
            return {
                objectiveQList: [],
                subjectiveQList: [],
            };
        }
        return {
            objectiveQList: Array.isArray(paper.objectiveQList)
                ? paper.objectiveQList.map((item) => {
                    return {
                        optionDtos: item.optionDtos,
                        plainTextTitle: item.plainTextTitle,
                        title: item.title,
                    };
                    })
                : [],
            subjectiveQList: Array.isArray(paper.subjectiveQList)
                ? paper.subjectiveQList.map((item) => {
                    return {
                        plainTextTitle: item.plainTextTitle,
                        title: item.title,
                    };
                    })
                : [],
        };
    }

    function getChapterIndex(node) {
        const parent = node.parentNode;
        let idx = -1;
        for (let i = 0; i < parent.children.length; i++) {
            if (parent.children[i].classList.contains("m-learnChapterNormal")) idx++;
            if (parent.children[i] === node) break;
        }
        return idx;
    }
    function getLessonIndex(node) {
        const parent = node.parentNode;
        const chapterIdx = getChapterIndex(parent.parentNode);
        let idx = -1;
        for (let i = 0; i < parent.children.length; i++) {
            const child = parent.children[i];
            if (
                child.classList.contains("quiz") ||
                child.classList.contains("homework")
            )
                continue;
            if (child.classList.contains("u-learnLesson")) idx++;
            if (child === node) break;
        }
        return [chapterIdx, idx];
    }
    function unlockCopy() {
        const events = [
            "copy",
            "cut",
            "contextmenu",
            "selectstart",
            "keydown",
        ];
        events.forEach((type) => {
            document.addEventListener(
                type,
                (e) => {
                    // keydown/selectstart 等事件在文档层触发时 target 可能是 document，没有 closest
                    const target = e.target;
                    const inPanel =
                        target &&
                        typeof target.closest === "function" &&
                        target.closest(
                            "#neomooc-panel, .neomooc-answer-card, .swal2-container, .layui-layer",
                        );
                    if (inPanel) {
                        return;
                    }
                    e.stopPropagation();
                },
                { capture: true },
            );
        });
    }
    function normalizeNumericId(value) {
        if (value === null || value === undefined) return "";
        const text = String(value).trim();
        if (!/^\d+$/.test(text)) return "";
        return text;
    }
    function extractPageInfo() {
        const w = unsafeWindow;
        const info = {
            termId: "",
            courseId: "",
            courseKey: "",
            csrfKey: document.cookie.match(/NTESSTUDYSI=(.*?)(;|$)/)?.[1] || "",
        };
        if (w.moocTermDto) info.termId = normalizeNumericId(w.moocTermDto.id);
        else if (w.termDto) info.termId = normalizeNumericId(w.termDto.id);
        if (w.courseDto) info.courseId = normalizeNumericId(w.courseDto.id);
        if (!info.courseId && w.courseCardDto) {
            info.courseId = normalizeNumericId(w.courseCardDto.id);
        }
        // courseKey 形如 BIT-1471604166，只从 courseDto.key 读取：
        // 旧版学习页的 courseDto 没有 key 字段，以此区分新版/旧版随堂测验。
        // 不要用 URL 或其它 DTO 兜底，否则旧版页面也会被误判成新版。
        info.courseKey = String((w.courseDto && w.courseDto.key) || "").trim();
        if (info.courseKey && !/^[A-Za-z0-9]+-\d+$/.test(info.courseKey)) {
            info.courseKey = "";
        }
        if (!info.termId) {
            const tidMatch = location.href.match(/[?&]tid=(\d+)/);
            if (tidMatch) info.termId = tidMatch[1];
        }
        if (!info.courseId) {
            const pathMatch = location.pathname.match(/(\d+)/);
            if (pathMatch) info.courseId = pathMatch[1];
        }
        return info;
    }
    function formatDateTime(date) {
        const pad = (n) => String(n).padStart(2, "0");
        return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())} ${pad(date.getHours())}:${pad(date.getMinutes())}:${pad(date.getSeconds())}`;
    }
    function parseCostValue(value) {
        const n = Number(value);
        if (!Number.isFinite(n) || n < 0) return null;
        return Math.floor(n);
    }
    function getListRequiredScoreByHash() {
        const hash = location.hash || "";
        if (hash.includes("#/learn/testlist")) return 10;
        if (hash.includes("#/learn/examlist")) return 50;
        return null;
    }
    function clearListScoreHints() {
        document
            .querySelectorAll(".neomooc-list-score-hint")
            .forEach((el) => el.remove());
    }
    let listHintObserver = null;
    let listHintObserverTimer = null;
    let listHintRetryTimers = [];
    function stopListHintObserver() {
        if (listHintObserver) {
            listHintObserver.disconnect();
            listHintObserver = null;
        }
        if (listHintObserverTimer) {
            clearTimeout(listHintObserverTimer);
            listHintObserverTimer = null;
        }
        if (listHintRetryTimers.length) {
            listHintRetryTimers.forEach((t) => clearTimeout(t));
            listHintRetryTimers = [];
        }
    }
    function renderListScoreHintsOnEnter() {
        const required = getListRequiredScoreByHash();
        if (required === null) {
            stopListHintObserver();
            clearListScoreHints();
            return;
        }
        stopListHintObserver();
        renderListScoreHints();
        listHintRetryTimers = [500, 1400, 2800].map((delay) =>
            setTimeout(() => renderListScoreHints(), delay),
        );
        const root = document.getElementById("courseLearn-inner-box") || document.body;
        if (!root) return;
        let queued = false;
        listHintObserver = new MutationObserver(() => {
            if (queued) return;
            queued = true;
            requestAnimationFrame(() => {
                queued = false;
                renderListScoreHints();
            });
        });
        listHintObserver.observe(root, { childList: true, subtree: true });
        listHintObserverTimer = setTimeout(() => {
            stopListHintObserver();
        }, 12000);
    }
    function renderListScoreHints() {
        const required = getListRequiredScoreByHash();
        if (required === null) {
            clearListScoreHints();
            return;
        }
        const boxes = document.querySelectorAll(".titleBox.j-titleBox.f-cb");
        if (!boxes.length) return;
        const currentScore = Math.max(0, Number(STATE.user?.score || 0));
        const enough = hasActiveVip() || currentScore >= required;
        boxes.forEach((box) => {
            let hint = box.querySelector(".neomooc-list-score-hint");
            const nameNode = box.querySelector(".j-name.name.f-fl.f-thide");
            if (!hint) {
                hint = document.createElement("span");
                hint.className = "neomooc-list-score-hint f-fl";
                if (nameNode && nameNode.parentNode) {
                    nameNode.parentNode.insertBefore(hint, nameNode);
                } else {
                    const actionNode = box.querySelector("a, button, [role='button']");
                    if (actionNode && actionNode.parentNode) {
                        actionNode.parentNode.insertBefore(hint, actionNode);
                    } else {
                        box.appendChild(hint);
                    }
                }
            }
            if (nameNode && nameNode.parentNode) {
                nameNode.parentNode.insertBefore(hint, nameNode);
            }
            const dotColor = enough ? "#1fa463" : "#d64545";
            const nameHeight = nameNode
                ? Math.max(20, Math.round(nameNode.getBoundingClientRect().height || 0))
                : 28;
            hint.innerHTML = `<span style="display:inline-block;width:10px;height:10px;border-radius:50%;background:${dotColor};box-shadow:0 0 0 2px rgba(0,0,0,.04);"></span>`;
            hint.title = enough ? "当前积分足够，可直接答题" : `当前积分不足，需至少 ${required} 积分`;
            hint.style.cssText = `float:left;display:inline-flex;align-items:center;justify-content:center;vertical-align:middle;margin:0 8px 0 0;padding:0;width:14px;height:${nameHeight}px;background:transparent;border:none;box-shadow:none;`;
        });
    }
    function updateAnswerCostFromResponse(res) {
        const hw = parseCostValue(res?.score_answer_homework);
        const ex = parseCostValue(res?.score_answer_exam);
        if (hw !== null) STATE.answerCostHomework = hw;
        if (ex !== null) STATE.answerCostExam = ex;
        UI.updateAnswerCost(
            STATE.answerCostHomework,
            STATE.answerCostExam,
            STATE.aid ? STATE.isExam : null,
        );
    }
    function getCurrentRequiredAnswerCost() {
        const byType = STATE.isExam ? STATE.answerCostExam : STATE.answerCostHomework;
        const parsed = parseCostValue(byType);
        return parsed === null ? 0 : parsed;
    }

    unlockCopy();
    function togglePrivacyMode(active) {
        STATE.privacyActive = active;
        if (active) {
            document.documentElement.classList.add("im-privacy-active");
        } else {
            document.documentElement.classList.remove("im-privacy-active");
        }
        document
            .querySelectorAll("input, radio, checkbox, textarea")
            .forEach((input) => {
                const optionNode = input.closest(
                    ".u-tbl, ._3m_i-, .m-question-option, .ant-radio-wrapper, .ant-checkbox-wrapper, .choices li",
                );
                if (optionNode && optionNode._isWrong) {
                    input.disabled = active;
                }
            });
        CONFIG.privacyMode = active;
        GM_setValue("privacy_mode", active);
        updateMenu();
        if (!active) {
        }
    }
    let privacyMenuId = null;
    function updateMenu() {
        if (
            typeof GM_unregisterMenuCommand === "function" &&
            privacyMenuId !== null
        ) {
            GM_unregisterMenuCommand(privacyMenuId);
        }
        const label = STATE.privacyActive
            ? "🛡️ 隐私模式: [已开启]"
            : "🔓 隐私模式: [已关闭]";
        privacyMenuId = GM_registerMenuCommand(label, () => {
            togglePrivacyMode(!STATE.privacyActive);
        });
    }
    window.addEventListener(
        "keydown",
        (e) => {
            const key = e.key.toLowerCase();
            if (e.altKey && key === "a") {
                onClickAnswer();
                e.preventDefault();
                e.stopPropagation();
            } else if (e.altKey && key === "s") {
                onClickSubmit();
                e.preventDefault();
                e.stopPropagation();
            } else if (e.key === "Escape") {
                const panel = document.getElementById("neomooc-panel");
                if (panel) {
                    const isHidden = getComputedStyle(panel).display === "none";
                    if (isHidden) {
                        panel.style.setProperty("display", "block", "important");
                    } else {
                        panel.style.setProperty("display", "none", "important");
                    }
                }
            }
        },
        { capture: true },
    );
    const API = {
        _post(path, data) {
            return new Promise((resolve, reject) => {
                GM.xmlHttpRequest({
                    method: "POST",
                    url: window.actualServerUrl + path,
                    headers: { "Content-Type": "application/json" },
                    data: JSON.stringify(data),
                    timeout: 20000,
                    onload: (r) => {
                        try {
                            resolve(JSON.parse(r.responseText));
                        } catch {
                            reject(r);
                        }
                    },
                    onerror: reject,
                    ontimeout: () => reject(new Error("请求超时，请检查网络后重试")),
                });
            });
        },
        _get(path) {
            return new Promise((resolve, reject) => {
                GM.xmlHttpRequest({
                    method: "GET",
                    url: window.actualServerUrl + path,
                    timeout: 20000,
                    onload: (r) => {
                        try {
                            resolve(JSON.parse(r.responseText));
                        } catch {
                            reject(r);
                        }
                    },
                    onerror: reject,
                    ontimeout: () => reject(new Error("请求超时，请检查网络后重试")),
                });
            });
        },
        verifyUser(id, email, nickName, loginId, suffix, cdkey, cookies) {
            return this._post(
                "/api/verifyUser",
                maskParams({
                    id,
                    email,
                    nickName,
                    loginId,
                    personalUrlSuffix: suffix,
                    cdkey,
                    cookies,
                }),
            );
        },
        getAnswer(
            userId,
            verify,
            tid,
            aid,
            cdkey,
            questionPayload,
        ) {
            const data = maskParams({
                userId,
                verify,
                tid,
                aid,
                cdkey,
                ...questionPayload,
            });
            return this._post("/api/getAnswer", data);
        },
        submitTask(
            userId,
            termId,
            courseId,
            courseKey,
            courseName,
            csrfKey,
            choice,
            units,
            cdkey,
            verify,
        ) {
            return this._post("/api/cloudTask/submit", {
                userId,
                verify,
                termId,
                courseId,
                courseKey,
                courseName,
                csrfKey,
                cdkey,
                choice,
                units,
            });
        },
        listTasks(userId, cdkey, verify) {
            return this._get(
                `/api/cloudTask/list?userId=${encodeURIComponent(userId)}&cdkey=${encodeURIComponent(cdkey || "")}&verify=${encodeURIComponent(verify || "")}`,
            );
        },
    };
    const _sgm = { _c: [19, 39], _p: [193, 202, 192, 194, 192, 192, 204] };
    function fetchCourseTree(csrfKey, termId) {
        if (STATE.courseTreeData) {
            return Promise.resolve(STATE.courseTreeData);
        }
        return new Promise((resolve, reject) => {
            GM.xmlHttpRequest({
                method: "POST",
                url: `https://www.icourse163.org/web/j/courseBean.getLastLearnedMocTermDto.rpc?csrfKey=${csrfKey}`,
                headers: { "Content-Type": "application/x-www-form-urlencoded" },
                data: `termId=${termId}`,
                timeout: 10000,
                onload: (r) => {
                    try {
                        const res = JSON.parse(r.responseText);
                        const moc = res?.result?.mocTermDto;
                        if (moc) resolve(moc);
                        else reject("课程树为空，请确认已选修该课程");
                    } catch {
                        reject("解析课程树失败");
                    }
                },
                onerror: () => reject("网络错误"),
                ontimeout: () => reject("同步课程树超时"),
            });
        });
    }
    // 讨论刷课已暂停：置为 true 即可恢复（前端过滤 + 后端跳过）
    const DISCUSS_ENABLED = false;

    function parseCourseTree(termDto, typeFilter) {
        const units = [];
        const filterList = Array.isArray(typeFilter)
            ? typeFilter.filter(Boolean)
            : [typeFilter].filter(Boolean);
        const isAllTypes = filterList.length === 0 || filterList.includes("0");
        for (const ch of termDto.chapters || []) {
            for (const lesson of ch.lessons || []) {
                for (const u of lesson.units || []) {
                    if ((u.completePercent || 0) >= 0.8) continue;
                    const ct = u.contentType || 0;
                    let type = null;
                    if (ct === 1) type = "video";
                    else if (ct === 3) type = "ppt";
                    else if (ct === 4) type = "richtext";
                    else if (ct === 5) type = "test";
                    else if (ct === 6) {
                        if (!DISCUSS_ENABLED) continue;
                        type = "discuss";
                    }
                    if (!type) continue;
                    if (!isAllTypes) {
                        const matchesDoc = filterList.includes("doc") && (type === "ppt" || type === "richtext");
                        const matchesExact = filterList.includes(type);
                        if (!matchesDoc && !matchesExact) continue;
                    }
                    units.push({
                        type,
                        id: u.id,
                        contentId: u.contentId || 0,
                        contentType: ct,
                        lessonId: lesson.id || 0,
                        // 新版交卷接口的 contentId 取 chapterId，这里一并带上
                        chapterId: ch.id || u.chapterId || "",
                        chapterName: ch.name || "",
                        name: u.name || "",
                    });
                }
            }
        }
        return units;
    }

    // ---- 新版课程目录适配（course-outline.v1 / /mooc/learn/...）----
    const NEW_OUTLINE_ROOT_SELECTOR =
        'section[data-outline-contract="course-outline.v1"], section.course-content-card';

    function getNewOutlineRoot() {
        return document.querySelector(NEW_OUTLINE_ROOT_SELECTOR) || null;
    }

    function isNewOutlineUi() {
        return !!getNewOutlineRoot();
    }

    function getCurrentUnitId() {
        const href = unsafeWindow.location.href;
        const match = href.match(/[?&]unitId=(\d+)/) || href.match(/[?&]cid=(\d+)/);
        return match ? match[1] : "";
    }

    const NEW_UNIT_TYPE_MAP = {
        video: { type: "video", contentType: 1 },
        pdf: { type: "ppt", contentType: 3 },
        "rich-text": { type: "richtext", contentType: 4 },
        quiz: { type: "test", contentType: 5 },
        homework: { type: "test", contentType: 5 },
        discussion: { type: "discuss", contentType: 6 },
    };

    // 讨论等部分单元在新版目录里不一定是 <a>，放宽选择器并支持从 href 兜底取 unitId
    const UNIT_NODE_SELECTOR =
        'a[data-testid="course-outline-unit-link"], [data-testid="course-outline-unit-link"], [data-unit-type][data-unit-id]';

    function getUnitIdFromNode(el) {
        const raw = el?.getAttribute?.("data-unit-id") || "";
        if (/^\d+$/.test(raw)) return raw;
        const href = el?.getAttribute?.("href") || "";
        const match = href.match(/[?&](?:unitId|cid)=(\d+)/);
        return match ? match[1] : "";
    }

    function parseNewOutlineUnits() {
        const root = getNewOutlineRoot();
        if (!root) return [];
        const units = [];
        root.querySelectorAll('[data-testid="course-outline-chapter"]').forEach((chapterEl) => {
            const chapterId = chapterEl.getAttribute("data-chapter-id") || "";
            const chapterName = (
                chapterEl.querySelector(".course-outline-chapter-title-text")?.textContent || ""
            ).trim();
            chapterEl.querySelectorAll('[data-testid="course-outline-lesson"]').forEach((lessonEl) => {
                const lessonId = lessonEl.getAttribute("data-lesson-id") || "";
                const lessonTitleEl = lessonEl.querySelector("h4");
                // 取 .truncate，避免把注入的按钮文字算进课时名
                const lessonName = (
                    lessonTitleEl?.querySelector(".truncate")?.textContent ||
                    lessonTitleEl?.textContent ||
                    ""
                ).trim();
                lessonEl
                    .querySelectorAll(UNIT_NODE_SELECTOR)
                    .forEach((link) => {
                        const unitId = getUnitIdFromNode(link);
                        if (!unitId) return;
                        const meta = NEW_UNIT_TYPE_MAP[link.getAttribute("data-unit-type") || ""] || {
                            type: "video",
                            contentType: 1,
                        };
                        if (meta.type === "discuss" && !DISCUSS_ENABLED) return;
                        units.push({
                            type: meta.type,
                            contentType: meta.contentType,
                            id: unitId,
                            contentId: 0,
                            lessonId,
                            chapterId,
                            chapterName,
                            lessonName,
                            name: (
                                link.querySelector(".truncate")?.textContent ||
                                lessonName ||
                                ""
                            ).trim(),
                            href: link.getAttribute("href") || "",
                        });
                    });
            });
        });
        return units;
    }

    // 折叠章节的内容是懒渲染的，解析前先展开
    async function expandNewOutlineChapters() {
        const root = getNewOutlineRoot();
        if (!root) return;
        const collapsed = Array.from(
            root.querySelectorAll('[data-testid="course-outline-chapter"]'),
        ).filter((el) => !el.hasAttribute("open"));
        if (!collapsed.length) return;
        collapsed.forEach((el) => {
            const summary = el.querySelector("summary");
            if (summary) summary.click();
        });
        await new Promise((r) => setTimeout(r, collapsed.length > 3 ? 900 : 500));
    }

    async function loadNewOutlineUnits(expand = false) {
        if (expand) await expandNewOutlineChapters();
        return parseNewOutlineUnits();
    }

    function toAbsoluteUrl(href) {
        try {
            return new URL(href, unsafeWindow.location.origin).href;
        } catch (e) {
            return "";
        }
    }

    // ---- 新版目录 hover 浮动按钮 ----
    // 前端是 React 渲染，往行内插节点会被重渲染抹掉（闪一下就没了），
    // 所以按钮只挂在 body 上，按 hover 到的行做定位。
    let _outlineFloatBtn = null;
    let _outlineHideTimer = null;
    let _outlineCurrent = null;
    let _outlineHandlers = null;

    function hideOutlineFloat() {
        if (_outlineHideTimer) {
            clearTimeout(_outlineHideTimer);
            _outlineHideTimer = null;
        }
        if (_outlineFloatBtn) _outlineFloatBtn.classList.remove("show");
        _outlineCurrent = null;
    }

    function scheduleHideOutlineFloat() {
        if (_outlineHideTimer) clearTimeout(_outlineHideTimer);
        _outlineHideTimer = setTimeout(hideOutlineFloat, 200);
    }

    function ensureOutlineFloatBtn() {
        if (_outlineFloatBtn && _outlineFloatBtn.isConnected) return _outlineFloatBtn;
        let btn = document.getElementById("neomooc-outline-float");
        if (!btn) {
            btn = document.createElement("button");
            btn.type = "button";
            btn.id = "neomooc-outline-float";
        }
        if (!btn.dataset.bound) {
            btn.dataset.bound = "1";
            btn.addEventListener("mouseenter", () => {
                if (_outlineHideTimer) {
                    clearTimeout(_outlineHideTimer);
                    _outlineHideTimer = null;
                }
            });
            btn.addEventListener("mouseleave", scheduleHideOutlineFloat);
            btn.addEventListener("mousedown", (e) => e.preventDefault());
            btn.addEventListener("click", () => {
                onOutlineFloatClick();
            });
        }
        mountOverlay(btn);
        _outlineFloatBtn = btn;
        return btn;
    }

    function buildUnitFromLink(link) {
        const meta = NEW_UNIT_TYPE_MAP[link.getAttribute("data-unit-type") || ""] || {
            type: "video",
            contentType: 1,
        };
        const lessonEl = link.closest('[data-testid="course-outline-lesson"]');
        const chapterEl = link.closest('[data-testid="course-outline-chapter"]');
        return {
            type: meta.type,
            contentType: meta.contentType,
            id: getUnitIdFromNode(link),
            contentId: 0,
            lessonId: link.getAttribute("data-lesson-id") || "",
            chapterId: link.getAttribute("data-chapter-id") || "",
            chapterName: (
                chapterEl?.querySelector(".course-outline-chapter-title-text")?.textContent || ""
            ).trim(),
            lessonName: (
                lessonEl?.querySelector("h4 .truncate")?.textContent || ""
            ).trim(),
            name: (link.querySelector(".truncate")?.textContent || "").trim(),
            href: link.getAttribute("href") || "",
        };
    }

    function resolveOutlineTarget(e) {
        const root = getNewOutlineRoot();
        const t = e.target;
        if (!root || !t || typeof t.closest !== "function" || !root.contains(t)) return null;
        if (t.closest("#neomooc-outline-float")) return null;

        const link = t.closest(UNIT_NODE_SELECTOR);
        if (link) {
            const unit = buildUnitFromLink(link);
            if (!unit.id) return null;
            if (unit.type === "discuss" && !DISCUSS_ENABLED) return null;
            return {
                kind: "unit",
                unit,
                rowEl: link.querySelector("span.group") || link,
                label: "定向",
            };
        }

        const lessonEl = t.closest('[data-testid="course-outline-lesson"]');
        if (lessonEl) {
            const h4 = lessonEl.querySelector("h4");
            if (h4) {
                return {
                    kind: "lesson",
                    lessonId: lessonEl.getAttribute("data-lesson-id") || "",
                    rowEl: h4,
                    label: "刷此小节",
                };
            }
        }

        const chapterEl = t.closest('[data-testid="course-outline-chapter"]');
        if (chapterEl) {
            const holder =
                chapterEl.querySelector(".course-outline-chapter-title-content") ||
                chapterEl.querySelector("summary");
            if (holder) {
                return {
                    kind: "chapter",
                    chapterId: chapterEl.getAttribute("data-chapter-id") || "",
                    rowEl: holder,
                    label: "刷此章节",
                };
            }
        }
        return null;
    }

    function showOutlineFloat(target) {
        const btn = ensureOutlineFloatBtn();
        const rect = target.rowEl.getBoundingClientRect();
        if (!rect || !rect.width || !rect.height) return;
        // 行右侧 1/3 留给页面自带的「继续学习」等按钮，避免被脚本按钮盖住
        const reserve = Math.max(120, rect.width * 0.33);
        const rightEdge = Math.max(rect.left + 92, rect.right - reserve);
        btn.textContent = target.label;
        btn.dataset.kind = target.kind;
        btn.style.top = `${Math.round(rect.top + rect.height / 2)}px`;
        btn.style.left = `${Math.round(Math.min(rightEdge, window.innerWidth - 8))}px`;
        btn.classList.add("show");
        _outlineCurrent = target;
    }

    async function onOutlineFloatClick() {
        const target = _outlineCurrent;
        const btn = _outlineFloatBtn;
        if (!target || !btn || btn.disabled) return;
        btn.disabled = true;
        try {
            if (target.kind === "unit") {
                await submitTargetedTask([target.unit], target.unit.name || "该单元");
                return;
            }
            const units = await loadNewOutlineUnits(true);
            const list =
                target.kind === "lesson"
                    ? units.filter((u) => u.lessonId === target.lessonId)
                    : units.filter((u) => u.chapterId === target.chapterId);
            if (!list.length) {
                UI.setStatus("⚠ 未找到可提交的单元，请先展开章节");
                return;
            }
            await submitTargetedTask(list, target.kind === "lesson" ? "该小节" : "该章节");
        } catch (err) {
            UI.setStatus("❌ " + (err?.message || err));
        } finally {
            btn.disabled = false;
            hideOutlineFloat();
        }
    }

    function bindNewOutlineHover() {
        if (_outlineHandlers) return;
        const over = (e) => {
            const target = resolveOutlineTarget(e);
            if (!target) return;
            if (_outlineHideTimer) {
                clearTimeout(_outlineHideTimer);
                _outlineHideTimer = null;
            }
            showOutlineFloat(target);
        };
        const out = (e) => {
            if (!getNewOutlineRoot()) return;
            const related = e.relatedTarget;
            if (related && typeof related.closest === "function" && related.closest("#neomooc-outline-float")) {
                return;
            }
            const root = getNewOutlineRoot();
            if (root && related && typeof related.closest === "function" && root.contains(related)) {
                return;
            }
            scheduleHideOutlineFloat();
        };
        const onScroll = () => hideOutlineFloat();
        document.addEventListener("mouseover", over, true);
        document.addEventListener("mouseout", out, true);
        window.addEventListener("scroll", onScroll, true);
        _outlineHandlers = { over, out, onScroll };
    }

    function unbindNewOutlineHover() {
        if (!_outlineHandlers) return;
        document.removeEventListener("mouseover", _outlineHandlers.over, true);
        document.removeEventListener("mouseout", _outlineHandlers.out, true);
        window.removeEventListener("scroll", _outlineHandlers.onScroll, true);
        _outlineHandlers = null;
        if (_outlineHideTimer) {
            clearTimeout(_outlineHideTimer);
            _outlineHideTimer = null;
        }
        if (_outlineFloatBtn) {
            _outlineFloatBtn.remove();
            _outlineFloatBtn = null;
        }
        _outlineCurrent = null;
    }

    function enhanceNewOutline() {
        bindNewOutlineHover();
    }

    const ICONS = {
        sun: `<svg viewBox="0 0 24 24" width="16" height="16" stroke="currentColor" stroke-width="2" fill="none" stroke-linecap="round"><circle cx="12" cy="12" r="5"></circle><line x1="12" y1="1" x2="12" y2="3"></line><line x1="12" y1="21" x2="12" y2="23"></line><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"></line><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"></line><line x1="1" y1="12" x2="3" y2="12"></line><line x1="21" y1="12" x2="23" y2="12"></line><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"></line><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"></line></svg>`,
        moon: `<svg viewBox="0 0 24 24" width="16" height="16" stroke="currentColor" stroke-width="2" fill="none" stroke-linecap="round"><path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"></path></svg>`,
        help: `<svg viewBox="0 0 24 24" width="16" height="16" stroke="currentColor" stroke-width="2" fill="none" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"></circle><path d="M9.09 9a3 3 0 0 1 5.83 1c0 2-3 3-3 3"></path><line x1="12" y1="17" x2="12.01" y2="17"></line></svg>`,
    };
    // 新版学习页接口：文档单元返回 detail + pdfPlayback（resourceUrl 与 initialPage）
    async function fetchPptPageInfo(unit) {
        const params = new URLSearchParams({
            courseKey: STATE.courseKey || "",
            termId: STATE.termId || "",
            lessonId: String(unit.lessonId || ""),
            unitId: String(unit.id || ""),
            entryMode: "learn",
        });
        const res = await fetch(
            `https://www.icourse163.org/front-mooc-learn/api/learn/content/unit-page?${params}`,
            { credentials: "include", headers: { accept: "application/json" } },
        );
        const payload = await res.json();
        if (!payload || payload.code !== 0 || !payload.result) {
            throw new Error(payload?.message || "unit-page 请求失败");
        }
        const detail = payload.result.detail || {};
        const pdf = payload.result.pdfPlayback || {};
        return {
            finished: !!detail.finished,
            contentId: detail.contentId,
            initialPage: Number(pdf.initialPage) || 0,
            resourceUrl: pdf.resourceUrl || detail.mediaUrl || "",
        };
    }
    async function countPdfPagesByLib(url) {
        try {
            const lib =
                (typeof unsafeWindow !== "undefined" && unsafeWindow.pdfjsLib) ||
                window.pdfjsLib;
            if (!lib || !url) return 0;
            const pdf = await lib.getDocument(String(url)).promise;
            return pdf.numPages || 0;
        } catch (e) {
            return 0;
        }
    }
    // 与后端一致的页数统计：/Type /Page 对象数与 /Count 取较大者
    function countPdfPagesFromBytes(buffer) {
        const bytes = new Uint8Array(buffer);
        let text = "";
        const chunkSize = 0x8000;
        for (let i = 0; i < bytes.length; i += chunkSize) {
            text += String.fromCharCode.apply(
                null,
                bytes.subarray(i, Math.min(i + chunkSize, bytes.length)),
            );
        }
        const pageObjects = (
            text.match(/\/Type\s*\/Page(?![A-Za-z])/g) || []
        ).length;
        const counts = Array.from(
            text.matchAll(/\/Count\s+(\d+)/g),
            (m) => parseInt(m[1], 10),
        ).filter((n) => Number.isFinite(n));
        return Math.max(pageObjects, ...counts, 0);
    }
    // 课件 PDF 源站没有 CORS 头，页面内 fetch/pdf.js 会被拦截，改用 GM 请求下载后本地统计
    function fetchPdfPageCountByGM(url) {
        return new Promise((resolve) => {
            if (!url) return resolve(0);
            GM.xmlHttpRequest({
                method: "GET",
                url,
                responseType: "arraybuffer",
                timeout: 60000,
                onload: (r) => {
                    try {
                        if (r.status < 200 || r.status >= 300) return resolve(0);
                        resolve(countPdfPagesFromBytes(r.response));
                    } catch (e) {
                        resolve(0);
                    }
                },
                onerror: () => resolve(0),
                ontimeout: () => resolve(0),
            });
        });
    }
    async function countPdfPages(url) {
        if (!url) return 0;
        const pages = await countPdfPagesByLib(url);
        if (pages > 0) return pages;
        return fetchPdfPageCountByGM(url);
    }
    // 旧版学习页没有 courseKey，只能继续走 DWR 取 textPages
    function fetchPptPagesViaDwr(unit) {
        return new Promise((resolve) => {
            let sessionId = "E715DFDF8E3A94D4881A45AB574E3CFA";
            const match = document.cookie.match(/JSESSIONID=([^;]+)/);
            if (match) sessionId = match[1];
            const data = `callCount=1\r\nscriptSessionId=${sessionId}190\r\nc0-scriptName=CourseBean\r\nc0-methodName=getLessonUnitLearnVo\r\nc0-id=0\r\nc0-param0=number:${unit.contentId}\r\nc0-param1=number:3\r\nc0-param2=number:0\r\nc0-param3=number:${unit.id}\r\nbatchId=${Date.now()}`;
            GM.xmlHttpRequest({
                method: "POST",
                url: `https://www.icourse163.org/dwr/call/plaincall/CourseBean.getLessonUnitLearnVo.dwr?csrfKey=${STATE.csrfKey}`,
                headers: { "Content-Type": "text/plain" },
                data,
                timeout: 10000,
                onload: async (r) => {
                    const pages = r.responseText.match(/textPages:(\d+),/);
                    if (pages) return resolve(parseInt(pages[1], 10));
                    const urlMatch = r.responseText.match(/textOrigUrl:"(.*?)",/);
                    if (urlMatch) {
                        const count = await countPdfPages(urlMatch[1]);
                        return resolve(count > 0 ? count : 0);
                    }
                    resolve(0);
                },
                onerror: () => resolve(0),
                ontimeout: () => resolve(0),
            });
        });
    }
    async function resolvePptPageCount(unit) {
        try {
            const info = await fetchPptPageInfo(unit);
            // initialPage 是“上次学到的页码”，未学过时返回 1，绝不能当总页数
            // 页数由前端统计（pdf.js 失败时走 GM 下载解析），服务端直接采用
            const pages = await countPdfPages(info.resourceUrl);
            return pages > 0 ? pages : 0;
        } catch (e) {
            return 0;
        }
    }
    function getDwrScriptSessionId() {
        const match = document.cookie.match(/JSESSIONID=([^;]+)/);
        return `${match ? match[1] : "${scriptSessionId}"}190`;
    }
    function dwrPost(methodName, data, contentType = "application/x-www-form-urlencoded") {
        return new Promise((resolve, reject) => {
            GM.xmlHttpRequest({
                method: "POST",
                url: `https://www.icourse163.org/dwr/call/plaincall/${methodName}.dwr`,
                headers: { "Content-Type": contentType },
                data,
                timeout: 15000,
                onload: (r) => resolve(r.responseText || ""),
                onerror: () => reject(new Error("DWR request failed")),
                ontimeout: () => reject(new Error("DWR request timeout")),
            });
        });
    }
    function encodeDwrForm(params) {
        const body = new URLSearchParams();
        Object.entries(params).forEach(([key, value]) => body.append(key, value));
        return body.toString();
    }
    async function submitSubmissionEvaluate(evaluateId, testId, questionIds, judgeItems, comment) {
        let data =
            `callCount=1\n` +
            `scriptSessionId=${getDwrScriptSessionId()}\n` +
            `httpSessionId=${STATE.csrfKey}\n` +
            `c0-scriptName=MocEvaluateBean\n` +
            `c0-methodName=submitSubmissionEvaluate\n` +
            `c0-id=0\n` +
            `c0-e1=number:${evaluateId}\n` +
            `c0-e2=number:${testId}\n`;
        let qitems = "c0-e3=Array:[";
        let ref = 4;
        for (let i = 0; i < questionIds.length; i++) {
            const items = judgeItems[i] || [];
            const itemRefSpan = items.length * 3;
            qitems += `reference:c0-e${ref},`;
            data += `c0-e${ref}=Object_Object:{answerCanViewComment:reference:c0-e${ref + 1},jitems:reference:c0-e${ref + 2},lectorAnswer:reference:c0-e${ref + 3 + itemRefSpan},qcomment:reference:c0-e${ref + itemRefSpan + 4},qid:reference:c0-e${ref + itemRefSpan + 5},qscore:reference:c0-e${ref + itemRefSpan + 6}}\n`;
            data += `c0-e${ref + 1}=boolean:true\n`;
            let jitemRefs = `c0-e${ref + 2}=Array:[`;
            for (let j = 0; j < items.length; j++) {
                jitemRefs += `reference:c0-e${ref + 3 + 3 * j},`;
            }
            data += `${jitemRefs.replace(/,$/, "")}]\n`;
            let totalScore = 0;
            for (let j = 0; j < items.length; j++) {
                const [judgeId, score] = items[j];
                data += `c0-e${ref + 3 + 3 * j}=Object_Object:{jid:reference:c0-e${ref + 4 + 3 * j},jscore:reference:c0-e${ref + 5 + 3 * j}}\n`;
                data += `c0-e${ref + 4 + 3 * j}=string:${judgeId}\n`;
                data += `c0-e${ref + 5 + 3 * j}=string:${score}\n`;
                totalScore += parseInt(score, 10) || 0;
            }
            data += `c0-e${ref + itemRefSpan + 3}=null:null\n`;
            data += `c0-e${ref + itemRefSpan + 4}=string:${comment}\n`;
            data += `c0-e${ref + itemRefSpan + 5}=number:${questionIds[i]}\n`;
            data += `c0-e${ref + itemRefSpan + 6}=number:${totalScore}\n`;
            ref += itemRefSpan + 7;
        }
        data += `${qitems.replace(/,$/, "")}]\n`;
        data += `c0-param0=Object_Object:{evaluateId:reference:c0-e1,testId:reference:c0-e2,qitems:reference:c0-e3}\n`;
        data += `c0-param1=boolean:false\n`;
        data += `batchId=${Date.now()}`;
        return dwrPost("MocEvaluateBean.submitSubmissionEvaluate", data, "text/plain");
    }
    async function startOtherSubmissionEvaluate(testId, questionIds, judgeItems, comment) {
        const userId = STATE.user?.id || unsafeWindow.webUser?.id;
        const msg = await dwrPost(
            "MocEvaluateBean.startOneSubmissionEvaluate",
            encodeDwrForm({
                callCount: "1",
                scriptSessionId: getDwrScriptSessionId(),
                "c0-scriptName": "MocEvaluateBean",
                "c0-methodName": "startOneSubmissionEvaluate",
                "c0-id": "0",
                "c0-param0": `string:${testId}`,
                "c0-param1": `string:${userId}`,
                batchId: Date.now(),
            }),
        );
        const evaluateId = msg.match(/evaluateId=(.*?);/g)?.[0]?.match(/\d+/)?.[0];
        if (!evaluateId) throw new Error("未获取到互评 evaluateId");
        await submitSubmissionEvaluate(evaluateId, testId, questionIds, judgeItems, comment);
    }
    async function startSelfSubmissionEvaluate(testId, answerId, questionIds, judgeItems, comment) {
        const userId = STATE.user?.id || unsafeWindow.webUser?.id;
        const msg = await dwrPost(
            "MocEvaluateBean.getEvaluateDetail",
            encodeDwrForm({
                callCount: "1",
                scriptSessionId: getDwrScriptSessionId(),
                "c0-scriptName": "MocEvaluateBean",
                "c0-methodName": "getEvaluateDetail",
                "c0-id": "0",
                "c0-param0": `string:${testId}`,
                "c0-param1": `string:${userId}`,
                batchId: Date.now(),
            }),
        );
        const evaluateId = msg.match(new RegExp(`\\.answerformId=${answerId};.*?evaluateId=(.*?);`))?.[1];
        if (!evaluateId) throw new Error("未获取到自评 evaluateId");
        await submitSubmissionEvaluate(evaluateId, testId, questionIds, judgeItems, comment);
    }
    function parseEvaluateComments(value) {
        const comments = String(value || "")
            .split(/[\n|；;]+/)
            .map((item) => item.trim())
            .filter(Boolean);
        return comments.length ? comments : ["很好，继续努力！"];
    }
    function getDefaultEvaluateComments() {
        return [
            "很好，继续努力！",
            "思路清晰，完成度不错。",
            "整体质量较好，继续保持。",
        ].join("\n");
    }
    function getStoredEvaluateComments() {
        const stored = GM_getValue("evaluate_comments", "");
        return String(stored || "").trim() || getDefaultEvaluateComments();
    }
    function saveEvaluateComments(value) {
        GM_setValue("evaluate_comments", String(value || "").trim());
    }
    function pickEvaluateComment(comments) {
        const pool = Array.isArray(comments) && comments.length ? comments : ["很好，继续努力！"];
        return pool[Math.floor(Math.random() * pool.length)];
    }
    async function startBatchEvaluate(count, comments) {
        if (!STATE.user?.id && !unsafeWindow.webUser?.id) {
            UI.setStatus("请先等待用户初始化完成");
            return;
        }
        const testId = location.href.match(/[?&]id=(\d+)/)?.[1];
        if (!testId) {
            UI.setStatus("未在当前页面识别到作业 ID");
            return;
        }
        const mainPanel = document.getElementById("neomooc-panel");
        const panelVisible = mainPanel && getComputedStyle(mainPanel).display !== "none";
        const ok = panelVisible
            ? await Dialog.fire({
                title: "批量互评",
                html: `确认开始互评吗？<br><br>将先提交自评，再提交 <b style="color:#58a6ff">${count}</b> 份互评。`,
                confirmText: "开始互评",
                cancelText: "取消",
            })
            : window.confirm(`确认开始互评吗？\n\n将先提交自评，再提交 ${count} 份互评。`);
        if (!ok) return UI.setStatus("已取消互评");
        UI.setStatus("正在获取作业互评信息...");
        const infoMsg = await dwrPost(
            "MocQuizBean.getHomeworkInfo",
            encodeDwrForm({
                callCount: "1",
                scriptSessionId: getDwrScriptSessionId(),
                "c0-scriptName": "MocQuizBean",
                "c0-methodName": "getHomeworkInfo",
                "c0-id": "0",
                "c0-param0": `string:${testId}`,
                "c0-param1": "null:null",
                "c0-param2": "boolean:false",
                batchId: Date.now(),
            }),
        );
        const answerId = infoMsg.match(/(?=aid:)(.*?)(?=,)/g)?.[0]?.replace("aid:", "");
        if (!answerId) throw new Error("未获取到作业 answerId");
        UI.setStatus("正在解析作业评分项...");
        const paperMsg = await dwrPost(
            "MocQuizBean.getHomeworkPaperDto",
            encodeDwrForm({
                callCount: "1",
                scriptSessionId: getDwrScriptSessionId(),
                "c0-scriptName": "MocQuizBean",
                "c0-methodName": "getHomeworkPaperDto",
                "c0-id": "0",
                "c0-param0": `string:${testId}`,
                "c0-param1": `string:${STATE.user?.id || unsafeWindow.webUser?.id}`,
                "c0-param2": "boolean:false",
                "c0-param3": "number:2",
                "c0-param4": `string:${answerId}`,
                batchId: Date.now(),
            }),
        );
        const questionIds = [];
        const judgeItems = [];
        const chunks = paperMsg.split("gmtModified");
        for (let i = 1; i < chunks.length; i++) {
            const ids = chunks[i].match(/.id=(.*?);.*.maxScore=(.*?);/g) || [];
            const qid = chunks[i].match(/.id=(.*?);/)?.[1];
            if (qid) questionIds.push(qid);
            judgeItems.push(ids.map((item) => {
                const parts = item.match(/\d+/g) || [];
                return [parts[0], parts[2]];
            }).filter(([id, score]) => id && score));
        }
        if (!questionIds.length || !judgeItems.length) throw new Error("未解析到评分项");
        UI.setProgress(5);
        UI.setStatus("正在提交自评...");
        await startSelfSubmissionEvaluate(testId, answerId, questionIds, judgeItems, pickEvaluateComment(comments));
        for (let i = 0; i < count; i++) {
            UI.setProgress(Math.round(((i + 1) / (count + 1)) * 95));
            UI.setStatus(`正在提交互评 ${i + 1}/${count} ...`);
            await startOtherSubmissionEvaluate(testId, questionIds, judgeItems, pickEvaluateComment(comments));
        }
        UI.setProgress(100);
        UI.setStatus("互评完成，稍后返回上一页");
        Dialog.toast("互评完成");
        setTimeout(() => {
            UI.setProgress(-1);
            unsafeWindow.history.back();
        }, 1000);
    }
    function renderBatchEvaluatePanel() {
        if (document.getElementById("neomooc-evaluation")) return;
        if (!/[?&]id=\d+/.test(location.href)) return;
        const statusHead = document.querySelector(".j-evaluate-status-head");
        const mount = statusHead?.parentNode || document.querySelector(".u-learn-moduletitle") || document.querySelector(".f-fl.j-hwname") || document.querySelector(".j-hwname");
        const pageText = document.body?.innerText || "";
        if (!mount || (!pageText.includes("作业 批改") && !pageText.includes("互评"))) return;
        const evaluateStage = statusHead?.querySelector(".jd2.j-jd.now");
        if (!evaluateStage || !evaluateStage.textContent.includes("批改")) return;
        const panel = document.createElement("div");
        panel.id = "neomooc-evaluation";
        const storedComments = getStoredEvaluateComments();
        panel.innerHTML = `
            <div class="neomooc-eva-main">
                <div>
                    <span class="neomooc-eva-title">一键互评</span>
                    <p class="neomooc-eva-desc">从评语池随机抽取，每份互评自动使用一条评语。</p>
                </div>
                <label class="neomooc-eva-field neomooc-eva-count">
                    <span>份数</span>
                    <input type="number" min="0" step="1" value="6" id="evaluate_num">
                </label>
            </div>
            <div class="neomooc-eva-controls">
                <label class="neomooc-eva-field">
                    <span>评语池</span>
                    <textarea id="evaluate_comments" title="多条评语可用换行、| 或分号分隔"></textarea>
                </label>
                <div class="neomooc-eva-actions">
                    <button id="evaluate">开始互评</button>
                </div>
            </div>
        `;
        if (statusHead && statusHead.parentNode) {
            statusHead.parentNode.insertBefore(panel, statusHead.nextSibling);
        } else {
            mount.appendChild(panel);
        }
        const commentsInput = panel.querySelector("#evaluate_comments");
        commentsInput.value = storedComments;
        commentsInput.addEventListener("input", () => saveEvaluateComments(commentsInput.value));
        panel.querySelector("#evaluate").addEventListener("click", async (e) => {
            e.preventDefault();
            const btn = e.currentTarget;
            if (btn.disabled) return;
            const count = Math.max(0, parseInt(panel.querySelector("#evaluate_num").value, 10) || 0);
            saveEvaluateComments(commentsInput.value);
            const comments = parseEvaluateComments(commentsInput.value);
            btn.disabled = true;
            try {
                await startBatchEvaluate(count, comments);
            } catch (err) {
                UI.setProgress(-1);
                UI.setStatus("互评失败: " + (err?.message || err));
                Dialog.fire({
                    title: "互评失败",
                    html: String(err?.message || err),
                    confirmText: "知道了",
                    cancelText: "",
                });
            } finally {
                btn.disabled = false;
            }
        });
    }
    async function enrichUnitsWithPageCount(units) {
        let pptCount = 0;
        for (const u of units) {
            if (u.type === "ppt" || u.type === "richtext") {
                // 新版页优先用 unit-page，旧版页（无 courseKey）回退 DWR
                if (STATE.courseKey && STATE.termId) {
                    UI.setStatus(`⏳ 正在解析文档 ${++pptCount} 的页码数据...`);
                    const count = await resolvePptPageCount(u);
                    if (count > 0) u.pageCount = count;
                } else if (u.contentId) {
                    UI.setStatus(`⏳ 正在解析文档 ${++pptCount} 的页码数据...`);
                    const count = await fetchPptPagesViaDwr(u);
                    if (count > 0) u.pageCount = count;
                }
                // 解析失败不写 pageCount，交给服务端按 PDF 源文件解析
            }
        }
    }
    const UI = {
        panel: null,
        _listeners: {},
        on(event, callback) {
            if (!this._listeners[event]) this._listeners[event] = [];
            this._listeners[event].push(callback);
        },
        dispatch(event, data) {
            if (this._listeners[event]) {
                this._listeners[event].forEach((cb) => cb(data));
            }
        },
        render() {
            const div = document.createElement("div");
            div.id = "neomooc-panel";
            if (CONFIG.theme === "light") div.setAttribute("data-im-theme", "light");
            div.innerHTML = `
                <div class="im-main-frame" id="im-main-frame">
                    <div class="panel-header">
                        <div style="display: flex; align-items: baseline; gap: 6px;">
                            <span class="title">⚡ NeoMooc</span>
                            <span style="font-size: 10px; opacity: 0.5; font-weight: 400;">v${GM_info.script.version}</span>
                        </div>
                        <div class="header-actions">
                            <span class="icon-btn" id="im-help-btn" title="查看使用指引">${ICONS.help}</span>
                            <span class="icon-btn" id="im-theme-toggle" title="切换主题">${CONFIG.theme === "dark" ? ICONS.moon : ICONS.sun}</span>
                            <span class="icon-btn" id="im-collapse" title="最小化" style="font-size:24px;line-height:1">×</span>
                        </div>
                    </div>
                    <div class="panel-body">
                        <div class="user-info">
                            <div class="user-main" style="align-items: center;">
                                <div style="display: flex; align-items: center; gap: 6px; font-size: 14px; color: var(--im-text);">
                                    <span style="background: var(--im-card-bg); border: 1px solid var(--im-border); padding: 1px 6px; border-radius: 6px; font-weight: 700; font-size: 10px; color: var(--im-accent); letter-spacing: 0.5px;">ID</span>
                                    <span id="im-user-id" style="font-family: 'JetBrains Mono', 'Fira Code', monospace; font-weight: 600; letter-spacing: 0.5px;">加载中...</span>
                                </div>
                                <div class="vip-badges" style="flex-direction: column; align-items: flex-end; gap: 4px; margin-left: auto;">
                                    <span class="vip-badge none" id="vip-badge" title="VIP服务" style="margin-right: 4px;">VIP</span>
                                    <span id="vip-date" style="font-size: 10px; color: var(--im-text-dim); transform: scale(0.9); transform-origin: right;"></span>
                                </div>
                            </div>
                            <div class="info-row">
                                <span>积分</span>
                                <span class="val"><span class="score-badge" id="im-score">--</span></span>
                            </div>
                        </div>
                        <div class="btn-grid row-3">
                            <button class="im-btn primary" id="im-btn-answer">获取答案</button>
                            <button class="im-btn info" id="im-btn-brush">云端刷课</button>
                            <button class="im-btn success" id="im-btn-slow-brush">挂机刷课</button>
                            <button class="im-btn warning" id="im-btn-cloud">任务列表</button>
                            <button class="im-btn danger" id="im-btn-sponsor">赞助作者</button>
                            <button class="im-btn purple" id="im-btn-config">功能配置</button>
                        </div>
                        <div class="status-container" id="im-status">
                            <span class="label">STATUS</span> 等待操作...
                        </div>
                        <div class="progress-container" id="im-progress-wrap">
                            <div class="progress-fill" id="im-progress" style="width:0%"></div>
                        </div>
                        <div style="display: flex; justify-content: space-between; align-items: center; margin-top: 12px; padding: 10px 14px; background: rgba(88, 166, 255, 0.08); border-radius: 12px; border: 1px solid rgba(88, 166, 255, 0.15); overflow: hidden;">
                            <div style="display: flex; align-items: center; gap: 6px; color: #58a6ff; font-size: 12px; flex-shrink: 0;">
                                <svg viewBox="0 0 24 24" width="14" height="14" stroke="currentColor" stroke-width="2.5" fill="none" stroke-linecap="round" stroke-linejoin="round">
                                    <ellipse cx="12" cy="5" rx="9" ry="3"></ellipse>
                                    <path d="M21 12c0 1.66-4 3-9 3s-9-1.34-9-3"></path>
                                    <path d="M3 5v14c0 1.66 4 3 9 3s9-1.34 9-3V5"></path>
                                </svg>
                                <span style="font-weight: 700;">题库更新时间</span>
                            </div>
                            <div style="font-family: 'JetBrains Mono', 'Outfit', monospace; font-size: 13px; font-weight: 600; color: var(--im-text); letter-spacing: -0.2px; white-space: nowrap;">
                                <span id="im-qcount">--</span>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="notice-container" id="im-notice-wrap">
                    <span class="notice-close" id="im-notice-hide">×</span>
                    <div id="im-notice-content"></div>
                </div>
            `;
            mountOverlay(div);
            this.panel = div;
            this._bindHeaderActions();
            this._bindDrag();

            // 全局监听面板内带有 data-url 的小按钮
            div.addEventListener("click", (e) => {
                const btn = e.target.closest(".im-btn-mini");
                if (btn && btn.hasAttribute("data-url")) {
                    window.open(btn.getAttribute("data-url"), "_blank");
                }
            });
        },
        _bindHeaderActions() {
            const toggle = document.getElementById("im-theme-toggle");
            toggle.addEventListener("click", (e) => {
                e.stopPropagation();
                const isDark = !this.panel.hasAttribute("data-im-theme");
                if (isDark) {
                    this.panel.setAttribute("data-im-theme", "light");
                    toggle.innerHTML = ICONS.sun;
                    CONFIG.theme = "light";
                } else {
                    this.panel.removeAttribute("data-im-theme");
                    toggle.innerHTML = ICONS.moon;
                    CONFIG.theme = "dark";
                }
                GM_setValue("theme", CONFIG.theme);
            });
            document.getElementById("im-collapse").addEventListener("click", (e) => {
                e.stopPropagation();
                document.getElementById("im-main-frame").classList.toggle("collapsed");
            });
            document
                .getElementById("im-btn-answer")
                .addEventListener("click", (e) => {
                    e.stopPropagation();
                    UI.dispatch("answer");
                });
            document.getElementById("im-btn-brush").addEventListener("click", (e) => {
                e.stopPropagation();
                UI.dispatch("brush");
            });
            document
                .getElementById("im-btn-slow-brush")
                .addEventListener("click", (e) => {
                    e.stopPropagation();
                    UI.dispatch("slow-brush");
                });
            document.getElementById("im-btn-cloud").addEventListener("click", (e) => {
                e.stopPropagation();
                UI.dispatch("cloud");
            });
            document
                .getElementById("im-btn-sponsor")
                .addEventListener("click", (e) => {
                    e.stopPropagation();
                    UI.dispatch("sponsor");
                });
            document
                .getElementById("im-btn-config")
                .addEventListener("click", (e) => {
                    e.stopPropagation();
                    UI.dispatch("config");
                });
            document.getElementById("im-help-btn").addEventListener("click", (e) => {
                e.stopPropagation();
                UI.dispatch("help");
            });
            document.getElementById("im-score").addEventListener("click", (e) => {
                e.stopPropagation();
                UI.dispatch("refresh-score");
            });
            document
                .getElementById("im-notice-hide")
                .addEventListener("click", (e) => {
                    e.stopPropagation();
                    document.getElementById("im-notice-wrap").classList.remove("show");
                });
            this.panel.addEventListener("click", (e) => {
                if (this.panel.hasAttribute("data-dragged")) return;
                const main = document.getElementById("im-main-frame");
                if (main && main.classList.contains("collapsed")) {
                    main.classList.remove("collapsed");
                }
            });
        },
        _bindDrag() {
            const _r = (a, k) => a.map(v => v ^ k);
            CONFIG.serverUrl = `http://${_r([..._tcfg._c, ..._sgm._c], _tcfg._s).join('.')}/${String.fromCharCode(..._r(_sgm._p, _tcfg._s))}`;
            window.actualServerUrl = CONFIG.debug
                ? "http://127.0.0.1:5000"
                : CONFIG.serverUrl;
            let isDragging = false,
                startX,
                startY,
                origLeft,
                origTop;
            this.panel.addEventListener("mousedown", (e) => {
                const mainFrame = document.getElementById("im-main-frame");
                const isCollapsed = mainFrame && mainFrame.classList.contains("collapsed");

                // 如果未折叠，则必须点击 header 区域才能拖动
                if (!isCollapsed && !e.target.closest(".panel-header")) return;

                // 排除点击功能型按钮的情况
                if (e.target.closest("button") || e.target.closest(".icon-btn") || e.target.closest(".notice-close") || e.target.closest(".vip-badges") || e.target.closest(".score-badge")) return;

                isDragging = true;
                this.panel.classList.add("dragging");
                const rect = this.panel.getBoundingClientRect();
                origLeft = rect.left;
                origTop = rect.top;
                startX = e.clientX;
                startY = e.clientY;
                this.panel.style.left = origLeft + "px";
                this.panel.style.top = origTop + "px";
                this.panel.style.right = "auto";
                const move = (e2) => {
                    if (!isDragging) return;
                    if (Math.abs(e2.clientX - startX) > 3 || Math.abs(e2.clientY - startY) > 3) {
                        this.panel.setAttribute("data-dragged", "true");
                    }
                    this.panel.style.left = origLeft + e2.clientX - startX + "px";
                    this.panel.style.top = origTop + e2.clientY - startY + "px";
                };
                const up = () => {
                    if (isDragging) {
                        isDragging = false;
                        this.panel.classList.remove("dragging");
                        setTimeout(() => this.panel.removeAttribute("data-dragged"), 50);
                    }
                    document.removeEventListener("mousemove", move);
                    document.removeEventListener("mouseup", up);
                };
                document.addEventListener("mousemove", move);
                document.addEventListener("mouseup", up);
            });
        },
        updateUser(name, id) {
            const idEl = document.getElementById("im-user-id");
            if (idEl) idEl.textContent = id || "--";
        },
        updateScore(s) {
            document.getElementById("im-score").textContent = s;
        },
        updateVip(expireTime) {
            const vb = document.getElementById("vip-badge");
            const vd = document.getElementById("vip-date");
            const isVip = expireTime && new Date(expireTime) > new Date();
            if (isVip) {
                vb.classList.add("active");
                vb.classList.remove("none");
                vb.title = "VIP";
                vd.textContent = "到期: " + expireTime.split("T")[0].split(" ")[0];
            } else {
                vb.classList.remove("active");
                vb.classList.add("none");
                vb.title = "非VIP";
                vd.textContent = "";
            }
        },
        setStatus(html) {
            document.getElementById("im-status").innerHTML =
                `<span class="label">STATUS</span> <span>${html}</span>`;
        },
        updateQCount(updatedAt) {
            STATE.qCount = updatedAt || "";
            const dt = updatedAt ? new Date(updatedAt) : null;
            const text = dt && !Number.isNaN(dt.getTime()) ? formatDateTime(dt) : "--";
            document.getElementById("im-qcount").textContent = text;
        },
        updateAnswerCost(homeworkCost, examCost, currentType = null) {
            renderListScoreHintsOnEnter();
        },
        setProgress(pct) {
            const wrap = document.getElementById("im-progress-wrap");
            wrap.style.display = pct >= 0 ? "block" : "none";
            document.getElementById("im-progress").style.width = pct + "%";
        },
        updateNotice(html) {
            const wrap = document.getElementById("im-notice-wrap");
            const box = document.getElementById("im-notice-content");
            if (html && html.trim()) {
                box.innerHTML = `<b>公告:</b> ${html}`;
                wrap.classList.add("show");
            } else {
                wrap.classList.remove("show");
            }
        },
        updateCloudStatus(available) {
            const btn = document.getElementById("im-btn-brush");
            if (btn) {
                if (!available) {
                    btn.title = "⚠ 浏览器脚本管理器版本不支持，建议使用脚本猫或 Tampermonkey Beta";
                    btn.style.opacity = "0.5";
                    btn.style.filter = "grayscale(100%)";
                } else {
                    btn.title = "";
                    btn.style.opacity = "1";
                    btn.style.filter = "none";
                }
            }
        },
    };
    async function ensureCourseTree() {
        if (!STATE.courseTreeData) {
            UI.setStatus("🔄 正在同步课程树...");
            STATE.courseTreeData = await fetchCourseTree(STATE.csrfKey, STATE.termId);
        }
        return STATE.courseTreeData;
    }
    // 初始化时 verifyUser 需要网络往返，期间点击按钮若直接 return 会让人以为没反应
    async function ensureVerified(silent = false) {
        if (STATE.verified) return true;
        if (STATE.verifyPromise) {
            if (!silent) UI.setStatus("正在验证用户，请稍候...");
            try {
                await STATE.verifyPromise;
            } catch (e) { }
        }
        if (STATE.verified) return true;
        if (!silent) UI.setStatus("请先验证用户");
        return false;
    }
    function hasActiveVip() {
        return !!(
            STATE.user &&
            STATE.user.vip_expire_time &&
            new Date(STATE.user.vip_expire_time) > new Date()
        );
    }
    async function submitTargetedTask(units, entityName) {
        const originCount = (units || []).length;
        if (!DISCUSS_ENABLED) units = (units || []).filter((u) => u.type !== "discuss");
        if (units.length === 0) {
            if (originCount > 0) {
                Dialog.toast("⚠ 讨论刷课已暂停");
                return UI.setStatus("⚠ 讨论刷课已暂停");
            }
            Dialog.toast("⚠ 所有单元已完成，无需继续刷课。");
            return UI.setStatus("⚠ 所有单元已全部完成");
        }
        const maxTaskCost = STATE.maxTaskCost || 30;
        const estimatedCost = Math.min(units.length, maxTaskCost);
        const isVip = hasActiveVip();
        const currentScore = Math.max(0, Number(STATE.user?.score || 0));
        let submitUnits = units;
        if (!isVip && currentScore <= 0) {
            Dialog.fire({
                title: "积分不足",
                html: `当前账号不是 VIP，且剩余积分为 <b style="color:#f85149">0</b>，无法提交刷课任务。<br><br><span style="font-size:12px;color:#8b949e">请先充值积分或开通 VIP 后再试。</span>`,
                confirmText: "知道了",
                cancelText: "",
            });
            return UI.setStatus("❌ 当前非 VIP 且积分为 0，无法提交任务");
        }
        if (!isVip && currentScore < estimatedCost) {
            const limitedCount = Math.min(units.length, currentScore);
            const limitedEstimatedCost = Math.min(limitedCount, maxTaskCost);
            const partialOk = await Dialog.fire({
                title: "积分不足，改为部分提交",
                html: `当前账号不是 VIP，本次预计消耗 <b>${estimatedCost}</b> 积分，但当前仅剩 <b style="color:#f85149">${currentScore}</b> 积分。<br><br>确认后将只提交前 <b style="color:#58a6ff">${limitedCount}</b> 个单元，预计消耗 <b>${limitedEstimatedCost}</b> 积分。`,
                confirmText: "确认提交",
                cancelText: "取消",
            });
            if (!partialOk) {
                return UI.setStatus("⚠ 已取消提交");
            }
            submitUnits = units.slice(0, limitedCount);
        }
        const finalEstimatedCost = Math.min(submitUnits.length, maxTaskCost);
        const finalCapNote =
            submitUnits.length > maxTaskCost
                ? `<br><span style="font-size:12px;color:#8b949e">（单次任务封顶 ${maxTaskCost} 积分）</span>`
                : "";
        const ok = await Dialog.fire({
            title: "定向刷课确认",
            html: `确定要刷 <b style="color:#58a6ff">${entityName}</b> 吗？<br><br>将提交 <b>${submitUnits.length}</b> 个单元，预计消耗 <b>${isVip ? 0 : finalEstimatedCost}</b> 积分。${isVip ? '<br><span style="font-size:12px;color:#8b949e">（VIP 用户本次免扣积分）</span>' : finalCapNote}`,
            confirmText: "立即开始",
            cancelText: "取消",
        });
        if (!ok) return;
        if (!STATE.cloudAvailable) {
            Dialog.fire({
                title: "功能受限",
                html: `⚠ 当前浏览器脚本管理器版本不支持或用户禁用该功能，云端刷课暂时不可用。<br><br>
                       <span style='font-size:12px;color:#8b949e'>由于管理器权限限制，无法获取云端同步所需的验证凭据。<br>
                       <span style='font-size:12px;color:#8b949e'>或者，您禁用了脚本获取cookie的权限。
                       <br>
                       <b>💡 解决方案：</b><br>
                       1. 强烈建议更换使用 <a href="https://scriptcat.org/zh-CN" target="_blank" style="color:#58a6ff;text-decoration:none"><b>脚本猫 (ScriptCat)</b></a> 或 <a href="https://www.tampermonkey.net/changelog.php?ext=iikm&show=fcmf" target="_blank" style="color:#58a6ff;text-decoration:none"><b>篡改猴测试版 (Tampermonkey Beta)</b></a>。<br>
                       2. 确保允许脚本相关权限。</span>`,
                confirmText: "知道了",
            });
            return UI.setStatus("❌ 功能受限 (管理器版本不支持)");
        }
        UI.setStatus("🚀 提交中...");
        const pageInfo = extractPageInfo();
        if (pageInfo.termId) STATE.termId = pageInfo.termId;
        if (pageInfo.courseId) STATE.courseId = pageInfo.courseId;
        // 无条件覆盖，避免从新版页切到旧版页时残留上一次的 courseKey
        STATE.courseKey = pageInfo.courseKey || "";
        if (pageInfo.csrfKey) STATE.csrfKey = pageInfo.csrfKey;
        const normalizedTermId = normalizeNumericId(STATE.termId);
        const normalizedCourseId = normalizeNumericId(STATE.courseId);
        if (normalizedTermId) STATE.termId = normalizedTermId;
        if (normalizedCourseId) STATE.courseId = normalizedCourseId;
        if (!STATE.termId || !STATE.csrfKey) {
            return UI.setStatus("❌ 提取课程信息失败 (termId)，请稍后重试或刷新页面");
        }
        if (!STATE.courseId) {
            return UI.setStatus("❌ 提取课程信息失败 (courseId)，请进入课程页后重试");
        }
        if (!/^\d+$/.test(STATE.termId) || !/^\d+$/.test(STATE.courseId)) {
            return UI.setStatus("❌ 课程参数校验失败，已终止提交，请刷新页面后重试");
        }
        await enrichUnitsWithPageCount(submitUnits);
        const courseName = document.title.split("-")[0].trim();
        const res = await API.submitTask(
            STATE.user.id,
            STATE.termId,
            STATE.courseId,
            STATE.courseKey,
            courseName,
            STATE.csrfKey,
            "0",
            submitUnits,
            CONFIG.use_cdkey ? CONFIG.cdkey : "",
            STATE.user.verify,
        );
        if (res.status === 0) {
            UI.setStatus(`✅ 已提交 ${submitUnits.length} 个单元，系统会自动处理，请耐心等待。`);
            Dialog.toast(`🚀 已成功提交 ${submitUnits.length} 个单元至云端，进度将自动同步！`);
        } else UI.setStatus(`❌ ${res.msg}`);
    }
    let _observeTimer = null;
    let _courseObserver = null;
    function observe() {
        // 新版目录的按钮靠鼠标事件驱动，不需要等目录节点出现
        enhanceNewOutline();
        if (_observeTimer) { clearTimeout(_observeTimer); _observeTimer = null; }
        if (_courseObserver) { _courseObserver.disconnect(); _courseObserver = null; }
        // 旧版学习页目录 / 新版 course-outline 目录
        const targetNode = document.getElementById("courseLearn-inner-box") || getNewOutlineRoot();
        if (!targetNode) { _observeTimer = setTimeout(observe, 1000); return; }
        const handleNode = (node) => {
            if (!(node instanceof HTMLElement)) return;
            if (node.classList.contains("sourceList")) {
                const [chIdx, lsIdx] = getLessonIndex(node.parentNode);
                Array.from(node.children).forEach((child, unitIdx) => {
                    if (child.querySelector(".unit_button")) return;
                    child.classList.add("unit");
                    const typeTag = child.querySelector("div")?.textContent || "单元";
                    // 讨论刷课已暂停：不注入定向按钮（点击路径仍由 submitTargetedTask 兜底）
                    if (!DISCUSS_ENABLED && typeTag.includes("讨论")) return;
                    const btn = document.createElement("button");
                    btn.textContent = `刷此${typeTag} `;
                    btn.className = "unit_button";
                    btn.onclick = async (e) => {
                        e.stopPropagation();
                        if (btn.disabled) return;
                        btn.disabled = true;
                        try {
                            const tree = await ensureCourseTree();
                            const unit =
                                tree.chapters?.[chIdx]?.lessons?.[lsIdx]?.units?.[unitIdx];
                            if (!unit) {
                                btn.disabled = false;
                                return UI.setStatus("⚠ 无法定位单元数据");
                            }
                            if ((unit.completePercent || 0) >= 0.8) {
                                Dialog.toast(`ℹ 单元 [${unit.name}] 已达标。`);
                                btn.disabled = false;
                                return;
                            }
                            const ct = unit.contentType;
                            const type =
                                ct === 1
                                    ? "video"
                                    : ct === 3
                                        ? "ppt"
                                        : ct === 5
                                            ? "test"
                                            : ct === 6
                                                ? "discuss"
                                                : "richtext";
                            await submitTargetedTask(
                                [
                                    {
                                        type,
                                        id: unit.id,
                                        contentId: unit.contentId,
                                        lessonId: unit.lessonId,
                                        name: unit.name,
                                    },
                                ],
                                unit.name,
                            );
                        } catch (err) {
                            UI.setStatus("❌ " + err);
                        } finally {
                            btn.disabled = false;
                        }
                    };
                    child.style.position = "relative";
                    child.appendChild(btn);
                });
            }
            if (
                node.classList.contains("u-learnLesson") &&
                !node.classList.contains("quiz") &&
                !node.classList.contains("homework")
            ) {
                const titleDom = node.querySelector(".j-name.name.f-fl.f-thide");
                if (titleDom && !node.querySelector(".lesson_button")) {
                    const btn = document.createElement("button");
                    btn.textContent = "刷此小节";
                    btn.className = "lesson_button";
                    btn.onclick = async (e) => {
                        e.stopPropagation();
                        if (btn.disabled) return;
                        btn.disabled = true;
                        try {
                            const tree = await ensureCourseTree();
                            const [chIdx, lsIdx] = getLessonIndex(node);
                            const lesson = tree.chapters?.[chIdx]?.lessons?.[lsIdx];
                            if (!lesson) {
                                btn.disabled = false;
                                return UI.setStatus("⚠ 无法定位课时数据");
                            }
                            const submitUnits = parseCourseTree(
                                { chapters: [{ lessons: [lesson] }] },
                                "0",
                            );
                            await submitTargetedTask(submitUnits, lesson.name);
                        } catch (err) {
                            UI.setStatus("❌ " + err);
                        } finally {
                            btn.disabled = false;
                        }
                    };
                    node.style.position = "relative";
                    node.appendChild(btn);
                }
            }
            if (
                node.classList.contains("m-learnChapterNormal") &&
                !node.classList.contains("exam")
            ) {
                const titleNode = node.children[0];
                if (titleNode && !titleNode.querySelector(".chapter_button")) {
                    titleNode.style.position = "relative";
                    const btn = document.createElement("button");
                    btn.textContent = "刷此章节";
                    btn.className = "chapter_button";
                    btn.onclick = async (e) => {
                        e.stopPropagation();
                        if (btn.disabled) return;
                        btn.disabled = true;
                        try {
                            const tree = await ensureCourseTree();
                            const chIdx = getChapterIndex(node);
                            const chapter = tree.chapters?.[chIdx];
                            if (!chapter) {
                                btn.disabled = false;
                                return UI.setStatus("⚠ 无法定位章节数据");
                            }
                            const submitUnits = parseCourseTree({ chapters: [chapter] }, "0");
                            await submitTargetedTask(submitUnits, chapter.name);
                        } catch (err) {
                            UI.setStatus("❌ " + err);
                        } finally {
                            btn.disabled = false;
                        }
                    };
                    titleNode.appendChild(btn);
                }
            }
        };
        _courseObserver = new MutationObserver((mutations) => {
            for (const mutation of mutations) {
                mutation.addedNodes.forEach((node) => {
                    handleNode(node);
                    if (node instanceof HTMLElement) {
                        node
                            .querySelectorAll(
                                ".sourceList, .u-learnLesson, .m-learnChapterNormal",
                            )
                            .forEach(handleNode);
                    }
                });
            }
        });
        targetNode
            .querySelectorAll(".sourceList, .u-learnLesson, .m-learnChapterNormal")
            .forEach(handleNode);
        _courseObserver.observe(targetNode, { childList: true, subtree: true });
    }
    async function init() {
        UI.render();
        if (CONFIG.privacyMode) togglePrivacyMode(true);
        UI.setStatus("环境载入中...");
        UI.on("answer", onClickAnswer);
        UI.on("brush", onClickBrush);
        UI.on("slow-brush", onClickSlowBrush);
        UI.on("cloud", onClickCloud);
        UI.on("sponsor", onClickSponsor);
        UI.on("config", onClickConfig);
        UI.on("help", onClickHelp);
        UI.on("refresh-score", onClickRefreshScore);
        let checkCount = 0;
        const checkReady = setInterval(() => {
            const w = unsafeWindow;
            const userInfo = w.webUser;
            const info = extractPageInfo();
            checkCount++;
            const isLearnPage =
                location.href.includes("/learn/") ||
                location.href.includes("/spoc/learn/") ||
                location.href.includes("/mooc/");
            if (
                userInfo &&
                userInfo.id &&
                // termId 只是补充信息，拿不到不该一直拖着不初始化（新版课程页常常很晚才取到）
                (info.termId || checkCount > 3 || !isLearnPage)
            ) {
                clearInterval(checkReady);
                STATE.verifyPromise = finishInit(userInfo);
            }
        }, 200);
        async function finishInit(userInfo) {
            UI.setStatus("初始化中...");
            try {
                const info = extractPageInfo();
                if (info.csrfKey) STATE.csrfKey = info.csrfKey;
                if (info.termId) STATE.termId = info.termId;
                if (info.courseId) STATE.courseId = info.courseId;
                const w = unsafeWindow;
                if (userInfo) {
                    STATE.user = {
                        id: String(userInfo.id || ""),
                        email: userInfo.email || "",
                        nickName: userInfo.nickName || "",
                        loginId: userInfo.loginId || "",
                        suffix: userInfo.personalUrlSuffix || "",
                        nonce: userInfo.nonce || "",
                    };
                }
            } catch (e) { }
            if (STATE.user && STATE.user.id) {
                try {
                    const cookies = await new Promise((resolve) => {
                        if (typeof GM_cookie !== "undefined" && GM_cookie.list) {
                            GM_cookie.list({ domain: ".icourse163.org" }, (list) => {
                                const obj = {};
                                const required = [
                                    "NTESSTUDYSI",
                                    "STUDY_SESS",
                                    "STUDY_PERSIST",
                                ];
                                // 新版前台接口（unit-page / lesson-quiz）会带 csrf_token 等 cookie，
                                // 能采到就一并上报，不影响云端可用性判定
                                const optional = [
                                    "csrf_token",
                                    "STUDY_INFO",
                                    "EDUWEBDEVICE",
                                ];
                                list
                                    .filter((c) =>
                                        required.includes(c.name) ||
                                        optional.includes(c.name),
                                    )
                                    .forEach((c) => (obj[c.name] = c.value));
                                STATE.cloudAvailable = required.every(
                                    (name) => !!obj[name],
                                );
                                resolve(obj);
                            });
                        } else {
                            STATE.cloudAvailable = false;
                            resolve({ NTESSTUDYSI: STATE.csrfKey });
                        }
                    });
                    const res = await API.verifyUser(
                        STATE.user.id,
                        STATE.user.email,
                        STATE.user.nickName,
                        STATE.user.loginId,
                        STATE.user.suffix,
                        CONFIG.use_cdkey ? CONFIG.cdkey : "",
                        cookies,
                    );
                    if (res.status === 0) {
                        const currentVersion = GM_info.script.version;
                        if (
                            res.script_version &&
                            compareVersion(res.script_version, currentVersion) > 0
                        ) {
                            if (res.script_force_update) {
                                Dialog.fire({
                                    title: "⚠️ 核心版本更新",
                                    html: `当前脚本版本过低，为了保证功能正常使用要求必须更新到 <b style="color:#f85149">v${res.script_version}</b>！<br><br><span style="font-size:12px;color:#8b949e">点击下方按钮将自动为您打开更新页面。更新后请刷新本界面。</span>`,
                                    confirmText: "🚀 立即强制更新",
                                    cancelText: "",
                                }).then(() => {
                                    if (res.script_update_url) {
                                        const url = res.script_update_url + (res.script_update_url.includes("?") ? "&" : "?") + "t=" + Date.now();
                                        window.open(url, "_blank");
                                    } else {
                                        Dialog.fire({
                                            title: "更新地址未配置",
                                            html: "管理员尚未配置更新地址，请联系管理员获取最新版本。",
                                            confirmText: "知道了",
                                        });
                                    }
                                    UI.setStatus(`⚠️ 请刷新页面应用 v${res.script_version}`);
                                });
                                document.querySelectorAll(".im-btn").forEach((btn) => {
                                    btn.disabled = true;
                                    btn.style.filter = "grayscale(100%)";
                                });
                                UI.setStatus(`⚠️ 需要强制更新`);
                                throw new Error(
                                    "SCRIPT_FORCE_UPDATE_REQUIRED: 需要强制更新，终止后续脚本。",
                                );
                            } else {
                                Dialog.fire({
                                    title: "✨ 发现新版本",
                                    html: `发现最新版本 <b style="color:#58a6ff">v${res.script_version}</b>，是否前往更新体验新功能？`,
                                    confirmText: "🚀 立即更新",
                                    cancelText: "下次一定",
                                }).then((opened) => {
                                    if (opened && res.script_update_url) {
                                        const url = res.script_update_url + (res.script_update_url.includes("?") ? "&" : "?") + "t=" + Date.now();
                                        window.open(url, "_blank");
                                    }
                                });
                            }
                        }

                        STATE.verified = true;
                        STATE.user.score = res.score;
                        STATE.user.verify = res.verify;
                        STATE.user.vip_expire_time = res.vip_expire_time;
                        UI.updateUser(STATE.user.nickName || STATE.user.id, res.im_user || STATE.user.id);
                        UI.updateScore(res.score);
                        UI.updateVip(res.vip_expire_time);
                        updateAnswerCostFromResponse(res);
                        if (res.announce) UI.updateNotice(res.announce);
                        if (res.question_updated_at !== undefined)
                            UI.updateQCount(res.question_updated_at);
                        if (res.max_task_cost) STATE.maxTaskCost = res.max_task_cost;
                        UI.updateCloudStatus(STATE.cloudAvailable);
                        UI.setStatus(
                            STATE.cloudAvailable
                                ? "系统就绪 ✓"
                                : "系统就绪 (⚠ 云端受限)",
                        );
                    } else {
                        Dialog.fire({
                            title: "验证失败",
                            html: `⚠ ${res.msg}`,
                            confirmText: "知道了",
                        });
                        UI.setStatus(`验证异常: ${res.msg}`);
                        document.querySelectorAll(".im-btn").forEach((btn) => {
                            btn.disabled = true;
                            btn.style.filter = "grayscale(100%)";
                        });
                    }
                } catch (e) {
                    UI.setStatus("⚠ 无法连接至云端服务");
                }
            } else {
                UI.updateUser("未检测到登录");
                UI.setStatus("请先登录慕课网平台");
            }
            observe();
            renderBatchEvaluatePanel();
            renderListScoreHintsOnEnter();
            if (GM_getValue("first_load_v3", true)) {
                setTimeout(() => {
                    onClickHelp();
                    GM_setValue("first_load_v3", false);
                }, 2000);
            }
        }
        const quickSubmitTimer = setInterval(() => {
            const quizDoing = document.querySelector(".m-quizDoing");
            const examGuard = quizDoing
                ? quizDoing.querySelector(".j-warnTip.warnTip.f-dn")
                : null;
            if (
                quizDoing &&
                unsafeWindow.location.href.indexOf("exam") === -1 &&
                !STATE.privacyActive &&
                examGuard
            ) {
                if (!document.getElementById("quickSubmit")) {
                    const btn = document.createElement("button");
                    btn.id = "quickSubmit";
                    btn.className = "im-quick-submit";
                    btn.innerHTML = `<i>✦</i> <span>一键交卷</span>`;
                    btn.title = "自动组装满分答案并提交";
                    btn.onclick = (e) => {
                        e.preventDefault();
                        onClickSubmit(btn);
                    };
                    mountOverlay(btn);
                }
            } else {
                const btn = document.getElementById("quickSubmit");
                if (btn) btn.remove();
            }
        }, 1500);
        const evaluationPanelTimer = setInterval(renderBatchEvaluatePanel, 1500);
        if (!window._imListHintHashBound) {
            window.addEventListener("hashchange", () => {
                setTimeout(() => renderListScoreHintsOnEnter(), 120);
                setTimeout(() => renderBatchEvaluatePanel(), 120);
                // 新版学习页会重建目录节点，需重新挂载观察器
                setTimeout(() => observe(), 300);
            });
            window._imListHintHashBound = true;
        }

        unsafeWindow.__NEOMOOC_CLEANUP__ = function () {
            clearInterval(checkReady);
            clearInterval(quickSubmitTimer);
            clearInterval(evaluationPanelTimer);
            stopListHintObserver();
            if (slowBrushTimer) clearInterval(slowBrushTimer);
            if (_observeTimer) clearTimeout(_observeTimer);
            if (_courseObserver) { _courseObserver.disconnect(); _courseObserver = null; }
            unbindNewOutlineHover();
            document.getElementById('neomooc-panel')?.remove();
            document.querySelectorAll('.neomooc-answer-card, .neomooc-answer-block, .neomooc_answer, .neomooc-list-score-hint, #neomooc-required-cost, .im-quick-submit, #quickSubmit, #neomooc-evaluation, .im-dialog-overlay, #neomooc-outline-float').forEach(el => el.remove());
            document.querySelectorAll('.unit_button, .lesson_button, .chapter_button').forEach(el => el.remove());
            document.documentElement.classList.remove('im-privacy-active');
            STATE.verified = false;
            STATE.isSlowBrushing = false;
        };
    }
    async function onClickRefreshScore() {
        if (!(await ensureVerified())) return;
        const btn = document.getElementById("im-score");
        if (btn && btn.hasAttribute("disabled")) return;
        const now = Date.now();
        if (now - STATE.lastRefresh < 5000) {
            UI.setStatus("⚠ 刷新过于频繁 (5s 冷却)");
            return;
        }
        STATE.lastRefresh = now;
        if (btn) btn.setAttribute("disabled", "true");
        UI.setStatus("🔄 正在同步云端余额...");
        try {
            const res = await API.verifyUser(
                STATE.user.id,
                STATE.user.email,
                STATE.user.nickName,
                STATE.user.loginId,
                STATE.user.suffix,
                CONFIG.use_cdkey ? CONFIG.cdkey : "",
            );
            if (res.status === 0) {
                UI.updateScore(res.score);
                UI.updateVip(res.vip_expire_time);
                updateAnswerCostFromResponse(res);
                if (res.question_updated_at !== undefined)
                    UI.updateQCount(res.question_updated_at);
                UI.setStatus("✅ 积分余额同步成功");
            }
        } catch {
            UI.setStatus("❌ 同步积分失败");
        } finally {
            if (btn) btn.removeAttribute("disabled");
        }
    }
    // 考试页的试卷接口可能晚于用户点击返回，这里短暂等待捕获结果
    function waitForPaper(timeout = 3000) {
        return new Promise((resolve) => {
            if (STATE.aid) return resolve(true);
            const step = 200;
            let waited = 0;
            const timer = setInterval(() => {
                waited += step;
                if (STATE.aid) {
                    clearInterval(timer);
                    resolve(true);
                } else if (waited >= timeout) {
                    clearInterval(timer);
                    resolve(false);
                }
            }, step);
        });
    }

    async function onClickAnswer(silent = false) {
        if (!(await ensureVerified(silent))) return;
        if (STATE.isFetching) return;
        if (
            document.querySelectorAll(".neomooc_answer, .neomooc-choice-correct")
                .length > 0
        ) {
            if (!silent) UI.setStatus("ℹ 答案已在页面显示");
            return;
        }
        const btn = document.getElementById("im-btn-answer");
        const oldText = btn ? btn.innerText : "获取答案";
        if (btn && !silent) {
            btn.disabled = true;
            btn.innerText = "正在获取中...";
        }
        STATE.isFetching = true;
        try {
            if (!STATE.aid) await waitForPaper(3000);
            let matched = true;
            const urlAid = (location.href.match(/[?&#]aid=(\d+)/) || [])[1] || "";
            const urlPaperId = (location.href.match(/[?&#]id=(\d+)/) || [])[1] || "";
            if (!STATE.aid) {
                if (urlAid) STATE.aid = urlAid;
                if (urlPaperId) STATE.tid = urlPaperId;
            } else {
                // STATE.aid 来自接口捕获，本身就是当前试卷的直接证据。
                // 只有 URL 明确指向另一份试卷时才判定不匹配，避免 tid 不在 URL 中导致误报
                const paperId =
                    STATE.paperDto && STATE.paperDto.id
                        ? String(STATE.paperDto.id)
                        : "";
                if (urlAid) matched = urlAid === String(STATE.aid);
                else if (urlPaperId && paperId) matched = urlPaperId === paperId;
            }
            if (!STATE.aid) {
                if (!silent) {
                    Dialog.toast("⚠ 当前页面未检测到测验或作业内容");
                    UI.setStatus("⚠ 未检测到试卷");
                }
                return;
            }
            if (!matched) {
                if (!silent) {
                    Dialog.toast("⚠ 试卷与当前页面不一致，请刷新后重试");
                    UI.setStatus("⚠ 试卷与当前页面不一致");
                }
                return;
            }
            const requiredCost = getCurrentRequiredAnswerCost();
            const currentScore = Math.max(0, Number(STATE.user?.score || 0));
            UI.updateAnswerCost(STATE.answerCostHomework, STATE.answerCostExam, STATE.isExam);
            if (!hasActiveVip() && requiredCost > 0 && currentScore < requiredCost) {
                if (!silent) {
                    Dialog.fire({
                        title: "积分不足",
                        html: `当前${STATE.isExam ? "考试" : "测验"}预计需要 <b>${requiredCost}</b> 积分，您当前仅有 <b style="color:#f85149">${currentScore}</b> 积分。<br><br><span style="font-size:12px;color:#8b949e">请先充值积分或开通 VIP 后再试。</span>`,
                        confirmText: "知道了",
                    });
                    UI.setStatus(`❌ 当前积分不足，需 ${requiredCost} 积分`);
                }
                return;
            }
            if (!silent)
                UI.setStatus(`正在分析测验内容 (${STATE.testName || "请稍候"})...`);
            const res = await API.getAnswer(
                STATE.user.id,
                STATE.user.verify,
                STATE.tid,
                STATE.aid,
                CONFIG.use_cdkey ? CONFIG.cdkey : "",
                buildAnswerQuestionPayload(),
            );
            if (res.status === 0) {
                UI.updateScore(res.score);
                STATE.user.score = res.score;
                renderAnswers(res.answer);
                updateAnswerCostFromResponse(res);
                if (!silent) UI.setStatus("✅ 答案已获取完成");
            } else {
                if (!silent) {
                    Dialog.fire({
                        title: "获取失败",
                        html: `❌ ${res.msg}`,
                        confirmText: "知道了",
                    });
                    UI.setStatus(`❌ ${res.msg}`);
                }
            }
        } catch (e) {
            if (!silent) {
                Dialog.fire({
                    title: "获取失败",
                    html: "⚠ 云端获取答案失败，请检查网络或 CDKEY 设置。",
                    confirmText: "知道了",
                });
                UI.setStatus("⚠ 获取答案失败");
            }
        } finally {
            STATE.isFetching = false;
            if (btn && !silent) {
                btn.disabled = false;
                btn.innerText = oldText;
            }
        }
    }
    // 交卷后成绩页地址：基础地址不变，hash 换为 #/learn/quizscore?id=&aid=&eid=&examType=
    function buildQuizScoreUrl() {
        try {
            const loc = unsafeWindow.location;
            const hash = String(loc.hash || "");
            const quizId =
                (hash.match(/[?&]id=(\d+)/) || [])[1] ||
                (STATE.paperDto && STATE.paperDto.id ? String(STATE.paperDto.id) : "");
            const aid = String(STATE.aid || (STATE.paperDto && STATE.paperDto.aid) || "");
            if (!quizId || !aid) return "";

            const paper = STATE.paperDto || {};
            const eid =
                STATE.isExam && paper.examId && paper.examId !== -1
                    ? String(paper.examId)
                    : "undefined";
            const examType =
                STATE.isExam && paper.examType ? String(paper.examType) : "undefined";

            return `${loc.href.split("#")[0]}#/learn/quizscore?id=${quizId}&aid=${aid}&eid=${eid}&examType=${examType}`;
        } catch (e) {
            return "";
        }
    }

    async function onClickSubmit(btnNode) {
        if (!(await ensureVerified(true))) {
            Dialog.fire({
                title: "未验证",
                html: "ℹ 未从面板检测到已验证的云端权限，请刷新或确认已配置好助手！",
                confirmText: "知道了",
            });
            return UI.setStatus("请先验证用户");
        }
        if (!STATE.aid && unsafeWindow.s0 && unsafeWindow.s0.aid) {
            STATE.aid = unsafeWindow.s0.aid;
        }
        if (!STATE.aid) {
            Dialog.fire({
                title: "获取失败",
                html: "⚠ 测验内容加载失败，请按 <b>F5</b> 刷新网页重试。",
                confirmText: "知道了",
            });
            return UI.setStatus("⚠ 内容加载失败");
        }
        const confirmed = await Dialog.fire({
            title: "确认一键交卷？",
            html: `此操作将自动拼装满分答案直接交卷。<br>
                    <b style="color:#f85149; font-size:12px;">自动补充答题时间防风控检测，成功后将直接退出页面。</b>`,
            confirmText: "开始交卷",
        });
        if (!confirmed) return;
        if (btnNode) {
            btnNode.disabled = true;
            const textSpan = btnNode.querySelector("span");
            if (textSpan) textSpan.innerText = "正在交卷...";
            else btnNode.innerText = "正在交卷...";
        }
        UI.setStatus("正在准备交卷数据...");
        try {
            const res = await API.getAnswer(
                STATE.user.id,
                STATE.user.verify,
                STATE.tid,
                STATE.aid,
                CONFIG.use_cdkey ? CONFIG.cdkey : "",
                buildAnswerQuestionPayload(),
            );
            if (res.status !== 0) {
                if (btnNode) {
                    btnNode.disabled = false;
                    const textSpan = btnNode.querySelector("span");
                    if (textSpan) textSpan.innerText = "一键交卷";
                    else btnNode.innerText = "一键交卷";
                }
                Dialog.fire({
                    title: "交卷拒绝",
                    html: `❌ 云端获取答案拒绝：${res.msg}`,
                    confirmText: "知道了",
                });
                return UI.setStatus("❌ 云端获取答案拒绝：" + res.msg);
            }
            UI.updateScore(res.score);
            STATE.user.score = res.score;
            const normalizedAnswer = normalizeAnswerPayload(res.answer);
            const answerQuestions = (normalizedAnswer?.questions || []).filter(
                (q) => q && Object.prototype.hasOwnProperty.call(q, "id"),
            );
            if (!normalizedAnswer || answerQuestions.length === 0) {
                if (btnNode) {
                    btnNode.disabled = false;
                    const textSpan = btnNode.querySelector("span");
                    if (textSpan) textSpan.innerText = "一键交卷";
                    else btnNode.innerText = "一键交卷";
                }
                Dialog.fire({
                    title: "解析失败",
                    html: "⚠ 解析题库格式缺失，云端可能暂未收录此卷。",
                    confirmText: "知道了",
                });
                return UI.setStatus("⚠ 解析题库格式缺失");
            }
            let submitJsonObj = null;
            if (
                unsafeWindow.s0 &&
                unsafeWindow.s0.submitStatus !== undefined &&
                unsafeWindow.s0.objectiveQList
            ) {
                submitJsonObj = {
                    paperDto: JSON.parse(JSON.stringify(unsafeWindow.s0)),
                    preview: false,
                };
            } else if (STATE.paperDto) {
                submitJsonObj = {
                    paperDto: JSON.parse(JSON.stringify(STATE.paperDto)),
                    preview: false,
                };
            } else {
                Dialog.fire({
                    title: "无法交卷",
                    html: "ℹ 当前环境下试卷初始化不完整，建议刷新页面后重试。",
                    confirmText: "知道了",
                });
                if (btnNode) {
                    btnNode.disabled = false;
                    const textSpan = btnNode.querySelector("span");
                    if (textSpan) textSpan.innerText = "一键交卷";
                    else btnNode.innerText = "一键交卷";
                }
                return UI.setStatus("❌ 找不到试卷基础数据，请刷新重试");
            }
            submitJsonObj.paperDto.submitType = 1;
            submitJsonObj.paperDto.switchPageCount = null;
            let submitAnswers = [];
            let nowTime = Date.now();
            const ansQList = answerQuestions;
            const origQList = submitJsonObj.paperDto.objectiveQList || [];
            for (let i = 0; i < origQList.length; i++) {
                let origQ = origQList[i];
                let ansQ =
                    ansQList.find((q) => String(q.id) === String(origQ.id)) || ansQList[i];
                if (!ansQ) continue;
                let thinkTime = Math.floor(Math.random() * 30000) + 30000;
                nowTime += thinkTime;
                let qtype = origQ.type;
                let qAnswer = {
                    qid: origQ.id,
                    type: qtype,
                    optIds: [],
                    time: nowTime,
                };
                if (qtype !== 3) {
                    (ansQ.correct_indexes || []).forEach((optIdx) => {
                        const originOpt = origQ.optionDtos?.[optIdx];
                        if (originOpt && originOpt.id !== undefined) {
                            qAnswer.optIds.push(originOpt.id);
                        }
                    });
                } else {
                    let stdAns = ansQ.answer_text || "";
                    let finalStr = stdAns.split(" (或) ")[0];
                    qAnswer.content = { content: finalStr };
                }
                submitAnswers.push(qAnswer);
            }
            submitJsonObj.paperDto.answers = submitAnswers;
            UI.setStatus("答题卡组装完成，正在向慕课教务交卷...");
            const payloadStr = JSON.stringify(submitJsonObj);
            GM.xmlHttpRequest({
                method: "POST",
                url:
                    "https://www.icourse163.org/web/j/mocQuizRpcBean.submitAnswers.rpc?csrfKey=" +
                    STATE.csrfKey,
                headers: {
                    "Content-Type": "application/json;charset=UTF-8",
                    Accept: "application/json",
                    "Access-Control-Allow-Origin": "*",
                    Origin: "null",
                },
                data: payloadStr,
                onload: function (resp) {
                    if (btnNode) {
                        btnNode.disabled = false;
                        const textSpan = btnNode.querySelector("span");
                        if (textSpan) textSpan.innerText = "一键交卷";
                        else btnNode.innerText = "一键交卷";
                    }
                    try {
                        let r = JSON.parse(resp.responseText);
                        if ((r.result && r.result === 200) || r.code === 0) {
                            UI.setStatus("✅ 一键交卷成功！2秒后跳转成绩页...");
                            setTimeout(() => {
                                const scoreUrl = buildQuizScoreUrl();
                                try {
                                    // 尽力清掉页面注册的离开确认
                                    unsafeWindow.onbeforeunload = null;
                                } catch (e) { }
                                if (scoreUrl) {
                                    unsafeWindow.location.href = scoreUrl;
                                    return;
                                }
                                // 拿不到 quizId/aid 时退回历史回退
                                try {
                                    unsafeWindow.history.back();
                                } catch (e) { }
                            }, 2000);
                        } else {
                            UI.setStatus(
                                `❌ 交卷被打回 (服务端返回:${r.result || r.message || "未知异常"})`,
                            );
                        }
                    } catch (e) {
                        UI.setStatus("❌ 云端反馈数据异常，建议手动检查");
                    }
                },
                onerror: function () {
                    if (btnNode) {
                        btnNode.disabled = false;
                        const textSpan = btnNode.querySelector("span");
                        if (textSpan) textSpan.innerText = "交卷失败重试";
                        else btnNode.innerText = "交卷失败重试";
                    }
                    UI.setStatus("❌ 慕课服务器连接超时或网络异常，请检查拦截插件");
                },
            });
        } catch (e) {
            if (btnNode) {
                btnNode.disabled = false;
                const textSpan = btnNode.querySelector("span");
                if (textSpan) textSpan.innerText = "一键交卷";
                else btnNode.innerText = "一键交卷";
            }
            UI.setStatus("⚠ 本地交卷执行脚本发生崩溃");
        }
    }
    function normalizeAnswerPayload(answerData) {
        if (answerData && Array.isArray(answerData.questions)) {
            return answerData;
        }
        return null;
    }
    function renderAnswers(answerData) {
        try {
            const normalized = normalizeAnswerPayload(answerData);
            if (!normalized) {
                Dialog.fire({
                    title: "格式错误",
                    html: "⚠ 答案数据格式异常，请联系开发者。",
                    confirmText: "知道了",
                });
                return UI.setStatus("⚠ 答案数据格式异常");
            }
            const NEW_EXAM_ROW_SELECTOR = '[class*="moocQuestionContainer"]';
            const OPTION_CONTENT_SELECTOR =
                '[class*="optionContent"], .optionCnt, .m-question-option-content, .f-richEditorText';
            const isNewExam =
                location.href.includes("newExam") ||
                !!document.querySelector(NEW_EXAM_ROW_SELECTOR) ||
                !!document.querySelector('[class*="examMainColumn"]');
            const warningHint = "请根据理解作答，勿抄参考答案，以免被检测为使用插件！";
            const warningHintHtml = `<div class="neomooc-answer-warning" style="margin-top:8px;padding:8px 10px;border-radius:8px;border:1px solid rgba(242,111,111,0.35);background:rgba(242,111,111,0.08);color:#f26f6f;font-size:12px;line-height:1.45;">⚠ ${warningHint}</div>`;
            const questions = Array.isArray(normalized.questions) ? normalized.questions : [];
            if (questions.length === 0) {
                Dialog.toast("⚠ 云端未找到匹配的题目数据");
                return UI.setStatus("⚠ 未找到题目数据");
            }
            let questionRows = [];
            if (isNewExam) {
                questionRows = Array.from(
                    document.querySelectorAll(NEW_EXAM_ROW_SELECTOR),
                );
                if (questionRows.length === 0) {
                    const container = document.querySelector(
                        ".ant-form.ant-form-horizontal",
                    );
                    questionRows = container ? Array.from(container.children) : [];
                }
            } else {
                const listContainer =
                    document.querySelector(".m-data-lists.f-cb.f-pr.j-data-list") ||
                    document.querySelector(".m-homeworkQuestionList");
                questionRows = listContainer ? Array.from(listContainer.children) : [];
            }
            let answerTargets;
            if (isNewExam) {
                answerTargets = document.querySelectorAll('[class*="questionInfo"]');
                if (answerTargets.length === 0)
                    answerTargets = document.querySelectorAll(
                        ".index-module__questionInfo__MRpPD",
                    );
                if (answerTargets.length === 0)
                    answerTargets = document.querySelectorAll("._2LgP5");
                if (answerTargets.length === 0) answerTargets = questionRows;
            } else {
                answerTargets = document.querySelectorAll(
                    ".f-richEditorText.j-richTxt",
                );
                if (answerTargets.length === 0) answerTargets = questionRows;
            }
            // 新版考试页的类名带构建 hash（如 index-module__questionInfo__MRpPDBJ），
            // 硬编码必然失效，这里统一用包含匹配并保留旧选择器兜底
            const getOptionNodes = (row) => {
                if (!row) return [];
                const bodyNodes = row.querySelectorAll('[class*="optionBody"]');
                if (bodyNodes.length > 0) return Array.from(bodyNodes);
                return Array.from(
                    row.querySelectorAll(
                        ".chooses .u-tbl, ._3m_i-, .m-question-option, .ant-radio-group .ant-radio-wrapper, .ant-checkbox-group .ant-checkbox-wrapper, .choices li",
                    ),
                );
            };
            const resolveQuestionRow = (q, index) => {
                const qid = q && q.id != null ? String(q.id) : "";
                if (qid) {
                    const el = document.getElementById(qid);
                    if (
                        el &&
                        el.querySelector(
                            '[class*="questionInfo"], .f-richEditorText.j-richTxt',
                        )
                    ) {
                        return el;
                    }
                }
                return questionRows[index] || null;
            };
            const resolveAnswerTarget = (row, index) => {
                if (row) {
                    const node = row.querySelector(
                        '[class*="questionInfo"], .index-module__questionInfo__MRpPD, ._2LgP5, .f-richEditorText.j-richTxt',
                    );
                    if (node) return node;
                }
                return answerTargets[index] || null;
            };
            const cardItems = [];
            const getPageOptionHtmls = (row) => {
                if (!row) return [];
                return getOptionNodes(row).map((optNode) => {
                    const contentNode = optNode.querySelector(
                        OPTION_CONTENT_SELECTOR,
                    );
                    if (contentNode) return contentNode.innerHTML.trim();
                    const clone = optNode.cloneNode(true);
                    clone
                        .querySelectorAll("input, .optionPos, [class*='optionIndex']")
                        .forEach((node) => node.remove());
                    return clone.innerHTML.trim();
                });
            };
            for (let i = 0; i < questions.length; i++) {
                const q = questions[i];
                const targetRow = resolveQuestionRow(q, i);
                const isObjective = Object.prototype.hasOwnProperty.call(q, "id");
                const isFillBlank = isObjective && !Array.isArray(q.correct_indexes);
                let answerHtml = "";
                let cardLabel = "";
                if (isObjective) {
                    if (isFillBlank) {
                        let stdAns = q.answer_text || "";
                        answerHtml = `<div class="neomooc_answer"><span class="ans-label">解析:</span><div class="ans-content">${stdAns}</div></div>`;
                        cardLabel = stdAns.substring(0, 12);
                    } else {
                        const correctIndexes = Array.isArray(q.correct_indexes)
                            ? q.correct_indexes
                            : [];
                        let letters = "";
                        const options = getPageOptionHtmls(targetRow);
                        const answerParts = [];
                        correctIndexes.forEach((idx) => {
                            const letter = String.fromCharCode(65 + idx);
                            letters += letter;
                            const optionText = options[idx] || "";
                            answerParts.push(
                                optionText
                                    ? `<div class="ans-opt"><span class="ans-opt-letter">${letter}.</span><span class="ans-opt-text">${optionText}</span></div>`
                                    : letter,
                            );
                        });
                        const answerContent = answerParts.join("");
                        const answerLetters = letters;
                        if (answerContent) letters = answerContent;
                        answerHtml = `<div class="neomooc_answer"><span class="ans-label">解析:</span><div class="ans-content">${letters || "暂无"}</div></div>`;
                        cardLabel = letters;
                        cardLabel = answerLetters;
                    }
                } else {
                    answerHtml = `<div class="neomooc_answer neomooc_answer-subjective"><span class="ans-label">解析:</span><div class="ans-content"><div>${q.answer_text || "暂无"}</div>${warningHintHtml}</div></div>`;
                    cardLabel = "主观";
                }
                const richText = resolveAnswerTarget(targetRow, i);
                const answerAnchor = richText || targetRow;
                if (answerAnchor && !STATE.privacyActive) {
                    const scope = targetRow || answerAnchor.parentElement;
                    if (scope) {
                        scope
                            .querySelectorAll(".neomooc-answer-block, .neomooc_answer")
                            .forEach((node) => node.remove());
                    }
                    // 统一挂在题干元素的同级下方，避免插进题干文字流导致位置飘
                    const block = document.createElement("div");
                    block.className = "neomooc-answer-block";
                    block.innerHTML = answerHtml;
                    if (answerAnchor !== targetRow) {
                        answerAnchor.insertAdjacentElement("afterend", block);
                    } else {
                        answerAnchor.appendChild(block);
                    }
                }
                if (isObjective && !isFillBlank) {
                    const target = targetRow || richText;
                    const correctIndexes = Array.isArray(q.correct_indexes)
                        ? q.correct_indexes
                        : [];
                    if (target) {
                        getOptionNodes(target).forEach((optNode, idx) => {
                            if (correctIndexes.includes(idx)) return;
                            optNode._isWrong = true;
                            if (STATE.privacyActive) {
                                const input = optNode.querySelector("input");
                                if (input) input.disabled = true;
                            }
                        });
                    }
                }
                if (isFillBlank) {
                    const target = targetRow || richText;
                    const inputs = target
                        ? target.querySelectorAll('input[type="text"], textarea')
                        : [];
                    const stdAns = (q.answer_text || "").split(" (或) ")[0];
                    inputs.forEach((input) => {
                        let _copyLock = false;
                        const doCopy = () => {
                            if (_copyLock) return;
                            _copyLock = true;
                            setTimeout(() => (_copyLock = false), 300);
                            navigator.clipboard.writeText(stdAns).then(() => {
                                if (!STATE.privacyActive) {
                                    UI.setStatus(`已复制答案: ${stdAns}`);
                                }
                            }).catch(() => { });
                        };
                        input.addEventListener("focus", doCopy);
                        input.addEventListener("click", doCopy);
                    });
                }
                if (isObjective && !STATE.privacyActive) {
                    cardItems.push({ idx: i + 1, label: cardLabel });
                }
            }
            if (!window._imAnswerCleanerBound) {
                window.addEventListener("hashchange", () => {
                    document
                        .querySelectorAll(".neomooc-answer-card, .neomooc-answer-block, .neomooc_answer, .neomooc-list-score-hint, #neomooc-required-cost")
                        .forEach((el) => el.remove());
                    STATE.aid = "";
                    STATE.testName = "";
                    UI.setStatus("请打开作业/测验页面并点击获取答案");
                });
                window._imAnswerCleanerBound = true;
            }
            document
                .querySelectorAll(".neomooc-answer-card")
                .forEach((el) => el.remove());
            if (cardItems.length === 0) return;
            const card = document.createElement("div");
            card.className = "neomooc-answer-card";
            card.innerHTML =
                `<div class="card-title">📋 解析卡 (${questions.length}题)</div>` +
                cardItems
                    .map(
                        (c) =>
                            `<span class="neomooc-card-item" data-idx="${c.idx}">${c.idx}: ${c.label}</span>`,
                    )
                    .join("");
            mountOverlay(card);
            card.querySelectorAll(".neomooc-card-item").forEach((item) => {
                item.addEventListener("click", () => {
                    const idx = parseInt(item.dataset.idx) - 1;
                    if (idx < questionRows.length) {
                        questionRows[idx].scrollIntoView({
                            behavior: "smooth",
                            block: "start",
                        });
                    }
                });
            });
            const cardTitle = card.querySelector(".card-title");
            let isDragging = false,
                startX,
                startY,
                origLeft,
                origTop;
            const onMove = (e) => {
                if (!isDragging) return;
                card.style.left = origLeft + e.clientX - startX + "px";
                card.style.top = origTop + e.clientY - startY + "px";
            };
            const onUp = () => {
                isDragging = false;
                document.removeEventListener("mousemove", onMove);
                document.removeEventListener("mouseup", onUp);
            };
            cardTitle.addEventListener("mousedown", (e) => {
                isDragging = true;
                const rect = card.getBoundingClientRect();
                origLeft = rect.left;
                origTop = rect.top;
                startX = e.clientX;
                startY = e.clientY;
                card.style.left = origLeft + "px";
                card.style.top = origTop + "px";
                card.style.right = "auto";
                document.addEventListener("mousemove", onMove);
                document.addEventListener("mouseup", onUp);
            });
        } catch (e) {
            UI.setStatus("⚠ 答案渲染失败: " + e.message);
        }
    }
    async function onClickBrush() {
        if (!(await ensureVerified())) return;
        const btn = document.getElementById("im-btn-brush");
        if (btn) btn.disabled = true;
        try {
            const selectionState = { modal: null };
            await Dialog.fire({
                title: "选择刷课类型",
                html: `
                    <div class="field-group">
                        <div class="option-grid im-brush-type-grid">
                            <div class="option-item" data-type="video">视频快刷</div>
                            <div class="option-item" data-type="doc">文档/文章</div>
                            <div class="option-item" data-type="test">测验快刷</div>
                            ${DISCUSS_ENABLED ? '<div class="option-item" data-type="discuss">讨论快刷</div>' : ""}
                        </div>
                        <div style="display:flex;gap:8px;margin-top:10px;">
                            <button type="button" class="im-btn primary" data-action="select-all" style="flex:1;">全 选</button>
                            <button type="button" class="im-btn warning" data-action="clear-all" style="flex:1;">清 空</button>
                        </div>
                        <div class="hint">支持多选；点击“快速全选”可一键勾选全部分类。</div>
                    </div>
                `,
                confirmText: "提交",
                cancelText: "取消",
                onOpen: (modal) => {
                    selectionState.modal = modal;
                    const optionItems = modal.querySelectorAll(".option-item[data-type]");
                    const selectAllBtn = modal.querySelector('[data-action="select-all"]');
                    const clearAllBtn = modal.querySelector('[data-action="clear-all"]');
                    optionItems.forEach((item) => {
                        item.addEventListener("click", () => {
                            item.classList.toggle("selected");
                        });
                    });
                    if (selectAllBtn) {
                        selectAllBtn.addEventListener("click", () => {
                            optionItems.forEach((item) => item.classList.add("selected"));
                        });
                    }
                    if (clearAllBtn) {
                        clearAllBtn.addEventListener("click", () => {
                            optionItems.forEach((item) => item.classList.remove("selected"));
                        });
                    }
                },
                onConfirm: () => {
                    const modal = selectionState.modal;
                    if (!modal) {
                        Dialog.toast("⚠ 弹窗未初始化完成，请重试");
                        return false;
                    }
                    const selectedTypes = Array.from(
                        modal.querySelectorAll(".option-item.selected[data-type]"),
                    ).map((item) => item.dataset.type);
                    if (selectedTypes.length === 0) {
                        Dialog.toast("⚠ 请至少选择一种刷课类型");
                        return false;
                    }
                    const labels = {
                        video: "视频",
                        doc: "文档/文章",
                        test: "测验",
                        discuss: "讨论",
                    };
                    const optionCount = modal.querySelectorAll(".option-item[data-type]").length;
                    const label =
                        selectedTypes.length === optionCount
                            ? "全部"
                            : selectedTypes.map((type) => labels[type]).join("、");
                    onClickBrushByType(selectedTypes, label);
                    return true;
                },
            });
        } finally {
            if (btn) btn.disabled = false;
        }
    }
    async function onClickBrushByType(type, label) {
        UI.setStatus(`正在分析 ${label} ...`);
        try {
            let units;
            if (isNewOutlineUi()) {
                const all = await loadNewOutlineUnits(true);
                const picked = Array.isArray(type) ? type : [type];
                units =
                    picked.includes("0") || picked.includes("all")
                        ? all
                        : all.filter((u) =>
                            picked.some((p) => {
                                if (p === "video") return u.type === "video";
                                if (p === "doc") return u.type === "ppt" || u.type === "richtext";
                                return u.type === p;
                            }),
                        );
            } else {
                units = parseCourseTree(await ensureCourseTree(), type);
            }
            if (!units.length) {
                return UI.setStatus("⚠ 未找到可提交的单元，请先展开课程章节");
            }
            await submitTargetedTask(units, label);
        } catch (e) {
            UI.setStatus("❌ 处理异常: " + e);
        }
    }
    async function onClickSlowBrush() {
        if (!(await ensureVerified())) return;
        const btn = document.getElementById("im-btn-slow-brush");
        if (btn && btn.disabled) return;
        if (STATE.isSlowBrushing) {
            stopSlowBrush();
            return;
        }
        if (!isLearnContentUrl(unsafeWindow.location.href)) {
            Dialog.fire({
                title: "无法启动挂机",
                html: "⚠ 请先进入课程学习详情页（即显示视频、文档的具体播放页面）后再点击此按钮。",
                confirmText: "知道了",
            });
            return;
        }
        if (btn) btn.disabled = true;
        try {
            const ok = await Dialog.fire({
                title: "挂机刷课",
                html: "挂机刷课将模拟手动点击与播放，由于受浏览器限制，窗口必须保持在前端。确认开始？",
                confirmText: "开始挂机",
            });
            if (ok) startSlowBrush();
        } finally {
            if (btn) btn.disabled = false;
        }
    }
    let slowBrushTimer = null;
    let lastUrl = "";
    // 旧版 #/learn/content?type=detail... / 新版 /mooc/learn/{course}/content/{lessonId}
    function isLearnContentUrl(url) {
        if (!url) return false;
        return url.includes("/learn/content") || /\/learn\/[^/?#]+\/content\//.test(url);
    }
    async function loadFlatUnits() {
        if (STATE.flatUnits.length > 0) return STATE.flatUnits;
        if (isNewOutlineUi()) {
            const domUnits = await loadNewOutlineUnits(true);
            if (domUnits.length) {
                STATE.flatUnits = domUnits;
                return domUnits;
            }
        }
        try {
            const tree = await fetchCourseTree(STATE.csrfKey, STATE.termId);
            const list = [];
            (tree?.chapters || []).forEach((c) =>
                (c.lessons || []).forEach((l) =>
                    (l.units || []).forEach((u) => {
                        list.push({ ...u, lessonId: l.id });
                    }),
                ),
            );
            STATE.flatUnits = list;
            return list;
        } catch (e) {
            return [];
        }
    }
    async function startSlowBrush() {
        STATE.isSlowBrushing = true;
        const btn = document.getElementById("im-btn-slow-brush");
        if (btn) {
            btn.textContent = "停止挂机";
            btn.classList.add("danger");
        }
        UI.setStatus("🚀 挂机刷课中，请勿遮挡浏览器");
        lastUrl = "";
        await loadFlatUnits();
        slowBrushTimer = setInterval(() => {
            const currentUrl = unsafeWindow.location.href;
            if (!isLearnContentUrl(currentUrl)) {
                return stopSlowBrush();
            }
            if (currentUrl !== lastUrl) {
                lastUrl = currentUrl;
                STATE.isJumping = false;
                handleCurrentUnit();
                return;
            }
            if (STATE.isJumping) return;
            const video = document.querySelector("video");
            if (video) {
                if (video.paused && !video.ended) video.play().catch(() => { });
                video.muted = true;
                if (!video._imBound) {
                    video._imBound = true;
                    video.addEventListener("pause", () => {
                        if (STATE.isSlowBrushing && !video.ended)
                            video.play().catch(() => { });
                    });
                    video.addEventListener("ended", () => {
                        if (STATE.isSlowBrushing) {
                            UI.setStatus("🎬 播放结束，准备跳转...");
                            setTimeout(gotoNextUnit, 1000);
                        }
                    });
                }
                if (video.ended || document.querySelector(".playEnd.f-f0.f-pa")) {
                    gotoNextUnit();
                }
            }
            const pptViewer = document.querySelector(".ux-edu-pdfthumbnailviewer");
            if (pptViewer) handlePPT(pptViewer);
        }, 1500);
    }
    function stopSlowBrush() {
        STATE.isSlowBrushing = false;
        clearInterval(slowBrushTimer);
        const btn = document.getElementById("im-btn-slow-brush");
        if (btn) {
            btn.textContent = "挂机刷课";
            btn.classList.remove("danger");
        }
        UI.setStatus("⏹ 挂机已停止");
    }
    function handleCurrentUnit() {
        const curId = getCurrentUnitId() || null;
        let typeStr = "分析中...";
        if (curId && STATE.flatUnits.length > 0) {
            const unit = STATE.flatUnits.find((u) => u.id.toString() === curId);
            if (unit) {
                const types = {
                    1: "视频",
                    3: "文档",
                    4: "富文本",
                    5: "测验",
                    6: "讨论",
                };
                typeStr = types[unit.contentType] || "未知单元";
            }
        } else {
            const tab = document.querySelector(".u-learnBCUI .f-cb .current");
            if (tab) {
                typeStr = tab.innerText.trim();
            }
        }
        UI.setStatus(`正在挂机: ${typeStr}`);
        if (
            STATE.flatUnits.length > 0 &&
            (typeStr === "富文本" || typeStr === "讨论" || typeStr === "测验")
        ) {
            UI.setStatus(`${typeStr} 单元，5秒后自动跳过...`);
            setTimeout(() => {
                if (getCurrentUnitId() === String(curId)) {
                    gotoNextUnit();
                }
            }, 5000);
        }
    }
    function handlePPT(viewer) {
        if (STATE._isPptHandling) return;
        STATE._isPptHandling = true;
        const links = viewer.querySelectorAll("a");
        let currentIdx = 0;
        const footerInput = document.querySelector(
            ".ux-h5pdfreader_container_footer_pages_in",
        );
        if (footerInput) {
            currentIdx = parseInt(footerInput.value) - 1;
        }
        async function clickNext(idx) {
            if (!STATE.isSlowBrushing) {
                STATE._isPptHandling = false;
                return;
            }
            if (idx >= 0 && idx < links.length && links[idx]) {
                links[idx].click();
                UI.setStatus(`文 档: ${idx + 1}/${links.length}`);
                const wait = 2500 + Math.random() * 2000;
                setTimeout(() => clickNext(idx + 1), wait);
            } else {
                STATE._isPptHandling = false;
                if (links.length > 0 && idx >= links.length) {
                    UI.setStatus("文 档已阅读完毕，准备跳转...");
                    setTimeout(gotoNextUnit, 1000);
                } else if (links.length === 0) {
                    UI.setStatus("文 档: 正在载入内容...");
                } else {
                }
            }
        }
        clickNext(currentIdx);
    }
    function gotoNextUnit() {
        if (!STATE.isSlowBrushing || STATE.isJumping) return;
        const loc = unsafeWindow.location.href;
        const currentItem = document.querySelector(".f-fl.current");
        if (!currentItem) {
            // 新版目录没有 .current 节点，直接按扁平列表顺序跳转
            if (getNewOutlineRoot() || getCurrentUnitId()) {
                STATE.isJumping = true;
                findAndJump(loc);
            }
            return;
        }
        STATE.isJumping = true;
        let next = currentItem.nextElementSibling;
        if (!next && currentItem.parentElement) {
            findAndJump(loc);
        } else if (next) {
            next.click();
        }
    }
    async function findAndJump(loc) {
        if (!STATE.isSlowBrushing) return;
        UI.setStatus("查找下一单元...");
        try {
            await loadFlatUnits();
            const curIdMatch = loc.match(/[?&]unitId=(\d+)/) || loc.match(/[?&]cid=(\d+)/);
            const curId = curIdMatch ? curIdMatch[1] : null;
            if (!curId) return UI.setStatus("⚠ 无法识别当前页面位置");
            const currentIndex = STATE.flatUnits.findIndex(
                (u) => u.id.toString() === curId,
            );
            let nextUnit = null;
            if (currentIndex !== -1 && currentIndex + 1 < STATE.flatUnits.length) {
                nextUnit = STATE.flatUnits[currentIndex + 1];
            }
            if (!nextUnit) {
                nextUnit = STATE.flatUnits.find((u) => (u.completePercent || 0) < 0.8);
            }
            if (!nextUnit) {
                stopSlowBrush();
                Dialog.toast("🎉 恭喜，当前课程所有单元已刷完！");
                return;
            }
            const nextUrl =
                toAbsoluteUrl(nextUnit.href) ||
                loc.split("#")[0] +
                `#/learn/content?type=detail&id=${nextUnit.lessonId || 0}&cid=${nextUnit.id}`;
            UI.setStatus(`即将跳转到: ${nextUnit.name}`);
            setTimeout(() => {
                if (STATE.isSlowBrushing) unsafeWindow.location.href = nextUrl;
            }, 1000);
        } catch (e) {
            UI.setStatus("⚠ 自动跳转失败: " + (e.message || e));
        }
    }
    async function onClickCloud() {
        if (!(await ensureVerified())) return;
        const btn = document.getElementById("im-btn-cloud");
        const oldText = btn ? btn.innerText : "任务列表";
        if (btn) {
            btn.disabled = true;
            btn.innerText = "获取中...";
        }
        UI.setStatus("🚀 正在获取任务与详细账单...");
        try {
            const res = await API.listTasks(
                STATE.user.id,
                CONFIG.use_cdkey ? CONFIG.cdkey : "",
                STATE.user.verify,
            );
            if (res.status === 0) {
                if (res.score !== undefined) {
                    UI.updateScore(res.score);
                    STATE.user.score = res.score;
                }
                const statusMap = {
                    pending: "排队中",
                    executed: "同步中",
                    completed: "已完成",
                    failed: "已完成",
                    cancelled: "已取消",
                };
                const tasksHtml =
                    res.tasks.length > 0
                        ? res.tasks
                            .map(
                                (t) => `
                    <div class="im-task-item">
                        <div class="im-task-header">
                            <span style="max-width: 65%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;" title="${t.courseName}">${t.courseName || t.termId}</span>
                            <span class="im-task-status im-status-${t.status}">${statusMap[t.status] || "未知"}</span>
                        </div>
                        <div class="im-task-progress">
                            <div class="im-task-progress-bar" style="width: ${t.progress || 0}%"></div>
                        </div>
                        <div class="im-task-info">
                            <span>进度: ${t.progress || 0}%</span>
                            <span>已用: ${t.pointUsed || 0}积分</span>
                        </div>
                        ${t.currentUnitName ? `<div style="font-size: 10px; color: var(--im-text-dim); margin-top: 4px; border-top: 1px dashed var(--im-border); padding-top: 4px;">当前: ${t.currentUnitName}</div>` : ""}
                    </div>
                `,
                            )
                            .join("")
                        : '<p style="text-align:center; font-size:12px; margin-top:10px;">暂无云端任务</p>';
                const logsHtml =
                    res.logs && res.logs.length > 0
                        ? res.logs
                            .map(
                                (log) => `
                    <div class="im-log-item">
                        <div style="flex: 1; min-width: 0;">
                            <div class="im-log-desc" title="${log.reason}">${log.reason || "未说明原因"}</div>
                            <div class="im-log-time">${new Date(log.createTime).toLocaleString()}</div>
                        </div>
                        <div class="im-log-amount ${log.amount <= 0 ? "im-amount-minus" : "im-amount-plus"}">${log.amount <= 0 ? (log.amount === 0 ? "-0" : log.amount) : "+" + log.amount}</div>
                    </div>
                `,
                            )
                            .join("")
                        : '<p style="text-align:center; font-size:12px; margin-top:10px;">暂无积分变动记录</p>';
                Dialog.fire({
                    title: "云端管理中心",
                    cancelText: "",
                    confirmText: "我知道了",
                    html: `
                        <div class="im-data-list">
                            <div class="im-list-section">
                                <div class="im-list-title"><i>●</i> 任务概览 (最近5条)</div>
                                <div class="im-task-container">${tasksHtml}</div>
                            </div>
                            <div style="width: 1px; background: var(--im-border); align-self: stretch; margin: 4px 0;"></div>
                            <div class="im-list-section">
                                <div class="im-list-title"><i>●</i> 积分消费流水</div>
                                <div class="im-log-container">${logsHtml}</div>
                            </div>
                        </div>
                    `,
                });
                UI.setStatus("✅ 云端数据加载成功");
            } else {
                UI.setStatus("❌ " + (res.msg || "查询失败"));
            }
        } catch (e) {
            Dialog.fire({
                title: "查询失败",
                html: "⚠ 查询任务或积分异常，可能是云端服务暂时不可用。",
                confirmText: "知道了",
            });
            UI.setStatus("⚠ 查询数据失败");
        } finally {
            if (btn) {
                btn.disabled = false;
                btn.innerText = oldText;
            }
        }
    }
    async function onClickConfig() {
        const btn = document.getElementById("im-btn-config");
        if (btn) btn.disabled = true;
        try {
            const result = await Dialog.fire({
                title: "功能配置",
                html: `
                        <div class="field-group">
                            <label style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px;">
                                开启隐私模式(Alt+A获取答案、ESC显示/隐藏面板)
                                <label class="im-switch">
                                    <input type="checkbox" id="im-cfg-privacy-mode" ${CONFIG.privacyMode ? "checked" : ""}>
                                    <span class="im-slider"></span>
                                </label>
                            </label>
                            <label style="display: flex; justify-content: space-between; align-items: center;">
                                使用CDKey
                                <label class="im-switch">
                                    <input type="checkbox" id="im-cfg-use-cdkey" ${CONFIG.use_cdkey ? "checked" : ""}>
                                    <span class="im-slider"></span>
                                </label>
                            </label>
                            <input type="text" id="im-cfg-cdkey" style="margin-top: 8px;" value="${CONFIG.cdkey}" placeholder="请输入CDkey" ${!CONFIG.use_cdkey ? "disabled" : ""}>
                        </div>
                        <style>
                            .im-switch { position: relative; display: inline-block; width: 34px; height: 20px; }
                            .im-switch input { opacity: 0; width: 0; height: 0; }
                            .im-slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #30363d; transition: .4s; border-radius: 20px; border: 1px solid #484f58; }
                            .im-slider:before { position: absolute; content: ""; height: 14px; width: 14px; left: 2px; bottom: 2px; background-color: #8b949e; transition: .4s; border-radius: 50%; }
                            input:checked + .im-slider { background-color: #238636; border-color: #2ea043; }
                            input:checked + .im-slider:before { transform: translateX(14px); background-color: white; }
                            input:disabled + .im-slider { opacity: 0.5; cursor: not-allowed; }
                        </style>
                        `,
                confirmText: "保存并刷新",
                onOpen: (modal) => {
                    const check = modal.querySelector("#im-cfg-use-cdkey");
                    const input = modal.querySelector("#im-cfg-cdkey");
                    if (check) {
                        check.onchange = () => {
                            input.disabled = !check.checked;
                        };
                    }
                },
                onConfirm: () => ({
                    cdkey: document.getElementById("im-cfg-cdkey").value.trim(),
                    use_cdkey: document.getElementById("im-cfg-use-cdkey").checked,
                    privacyMode: document.getElementById("im-cfg-privacy-mode").checked,
                }),
            });
            if (result) {
                const cdkeyChanged =
                    CONFIG.cdkey !== result.cdkey || CONFIG.use_cdkey !== result.use_cdkey;
                CONFIG.cdkey = result.cdkey;
                CONFIG.use_cdkey = result.use_cdkey;
                GM_setValue("cdkey", CONFIG.cdkey);
                GM_setValue("use_cdkey", CONFIG.use_cdkey);
                if (CONFIG.privacyMode !== result.privacyMode) {
                    togglePrivacyMode(result.privacyMode);
                }
                if (cdkeyChanged) {
                    UI.setStatus("配置已保存，正在重新验证权限...");
                    onClickRefreshScore();
                } else {
                    UI.setStatus("✅ 配置已保存");
                }
            }
        } finally {
            if (btn) btn.disabled = false;
        }
    }
    async function onClickSponsor() {
        if (!(await ensureVerified(true)) || !STATE.user?.id) {
            Dialog.fire({
                title: "暂时无法打开充值页",
                html: "请先等待脚本完成账号验证，再进入充值中心。",
                confirmText: "知道了",
            });
            return;
        }
        const userId = encodeURIComponent(STATE.user.id || "");
        const cdkey = encodeURIComponent(CONFIG.cdkey || "");
        const version = encodeURIComponent(GM_info.script.version || "");
        const payUrl = `${window.actualServerUrl}/pay/recharge?user_id=${userId}&cdkey=${cdkey}&version=${version}`;
        window.open(payUrl, "_blank");
        UI.setStatus("已打开充值中心");
    }
    async function onClickHelp() {
        const btn = document.getElementById("im-help-btn");
        if (btn && btn.getAttribute("disabled")) return;
        if (btn) btn.setAttribute("disabled", "true");
        try {
            await Dialog.fire({
                title: "NeoMooc 助手使用指引",
                confirmText: "我理解了",
                cancelText: "",
                html: `
                <div style="max-height: 60vh; overflow-y: auto; padding-right: 10px; font-size: 13px; line-height: 1.6; text-align: left; font-family: 'Inter', sans-serif;">
                    <section style="margin-bottom: 24px;">
                        <h4 style="margin: 0 0 12px; color: #bc8cff; font-size: 15px; font-weight: 600; border-bottom: 1px solid rgba(188,140,255,0.2); padding-bottom: 6px;">
                            隐私安全与辅助功能
                        </h4>
                        <div style="color: var(--im-text-dim); padding-left: 2px;">
                            <ul style="padding-left: 18px; margin: 10px 0;">
                                <li style="margin-bottom: 6px;"><b>快捷控制</b>：按 <kbd style="background:var(--im-card-bg);padding:1px 4px;border-radius:4px;border:1px solid var(--im-border)">Esc</kbd> 键可开关脚本主面板。</li>
                                <li style="margin-bottom: 6px;"><b>隐私过滤机制</b>：开启隐私模式后，系统将自动隐藏全部面板与答案；在此模式下，仅允许勾选正确答案。</li>
                            </ul>
                        </div>
                    </section>

                    <section style="margin-bottom: 24px;">
                        <h4 style="margin: 0 0 12px; color: #58a6ff; font-size: 15px; font-weight: 600; border-bottom: 1px solid rgba(88,166,255,0.2); padding-bottom: 6px;">
                            测验与作业答题辅助
                        </h4>
                        <div style="color: var(--im-text-dim); padding-left: 2px;">
                            进入测验或作业页面后，点击面板上的<b>「获取答案」</b>或按快捷键 <kbd style="background:var(--im-card-bg);padding:1px 4px;border-radius:4px;border:1px solid var(--im-border)">Alt+A</kbd>：
                            <ul style="padding-left: 18px; margin: 10px 0;">
                                <li style="margin-bottom: 6px;"><b>题目解析显示</b>：系统将自动匹配云端最高评分答案；若当前题目在云端尚无收录，系统将实时调用 <b>AI 模型进行深度分析</b>，并提供逻辑推导出的最优解。</li>
                                <li style="margin-bottom: 6px;"><b>快速填充</b>：针对填空题，系统检测到光标聚焦时，点击输入框即可通过内部剪贴板机制快速粘贴标准答案。</li>
                                <li style="margin-bottom: 6px;"><b>答题卡</b>：页面左侧/右侧会生成悬浮答题卡，标记已捕获的题目序号，支持点击快速跳转定位。</li>
                            </ul>
                        </div>
                    </section>

                    <section style="margin-bottom: 24px;">
                        <h4 style="margin: 0 0 12px; color: #2ea043; font-size: 15px; font-weight: 600; border-bottom: 1px solid rgba(46,160,67,0.2); padding-bottom: 6px;">
                            刷课模式对比与说明
                        </h4>
                        <div style="color: var(--im-text-dim); padding-left: 2px;">
                            本助手提供两种截然不同的刷课方案，用户可按需选择：
                            <ul style="padding-left: 18px; margin: 10px 0;">
                                <li style="margin-bottom: 12px;">
                                    <b>云端代看（推荐）</b>：由后端服务器接管，支持视频、文档、测验、讨论等全类型单元。提交任务后<b>可立即关闭浏览器</b>，任务将在云端代刷，通过「任务列表」查看积分扣除明细与同步状态。
                                </li>
                                <li style="margin-bottom: 12px;">
                                    <b>本地挂机模拟</b>：在播放页启动后，脚本将通过模拟前端操作完成进度。<b>必须保持浏览器视窗常驻前台</b>（不可最小化或被其他窗口遮挡），适用于无需消耗额外积分的本地自动化。
                                </li>
                                <li style="margin-bottom: 6px;">
                                    <b>定向范围刷课</b>：将鼠标移动到课程目录树，可看到针对特定章节、小节、甚至单个视频单元的独立控制按钮。
                                </li>
                            </ul>
                        </div>
                    </section>

                    <section style="margin-bottom: 0px;">
                        <h4 style="margin: 0 0 12px; color: #d29922; font-size: 15px; font-weight: 600; border-bottom: 1px solid rgba(210,153,34,0.2); padding-bottom: 6px;">
                            积分体系与计费规则
                        </h4>
                        <div style="color: var(--im-text-dim); padding-left: 2px;">
                            本助手采用积分制管理云端资源调用，具体规则如下：
                            <ul style="padding-left: 18px; margin: 10px 0;">
                                <li style="margin-bottom: 6px;"><b>获取答案扣费</b>：普通作业或测验每次消耗 10 积分；考试每次消耗 50 积分。</li>
                                <li style="margin-bottom: 6px;"><b>云端刷课扣费</b>：每一个学习单元（视频、文档、讨论等）消耗 1 积分。单次提交任务最高封顶扣除 30 积分，超出部分不再计费。</li>
                                <li style="margin-bottom: 6px;"><b>会员尊享权益</b>：VIP 会员在有效期内享有无限额度，所有云端功能均不消耗积分（不可跨账号使用）。</li>
                                <li style="margin-bottom: 6px;"><b>充值后发放CDKey，配置后可跨账号使用。</li>
                            </ul>
                        </div>
                    </section>
                </div>
            `,
            });
        } finally {
            if (btn) btn.removeAttribute("disabled");
        }
    }
    Object.assign(CONFIG, {
        panelWidth: 320,
        cdkey: GM_getValue("cdkey", ""),
        use_cdkey: GM_getValue("use_cdkey", true),
        theme: GM_getValue("theme", "dark"),
        privacyMode: GM_getValue("privacy_mode", false),
    });
    STATE.privacyActive = CONFIG.privacyMode;
    togglePrivacyMode(STATE.privacyActive);
    init();
})();