// ==UserScript==
// @name         知乎 · 盐选与软广屏蔽
// @namespace    https://local/userscript/zhihu-hide-yanxuan
// @version      3.2.0
// @description  屏蔽知乎推荐流里的盐选内容与软广。网络层直接过滤接口 JSON（不渲染不闪烁），页面层兜底；官方广告直接隐藏，疑似软广按多信号打分折叠，可逐条复核、一键信任作者。另在屏幕右缘提供圆形按钮，一键触发知乎文章底部的「收起」。
// @author       WorkBuddy
// @match        *://www.zhihu.com/*
// @match        *://m.zhihu.com/*
// @run-at       document-start
// @grant        none
// @noframes
// @license Apache-2.0
// ==/UserScript==

(function () {
  'use strict';

  /* ============================================================
   * 0. 常量与状态
   * ============================================================ */

  const NS = 'zhyx';
  const ID_PILL = NS + '-pill';
  const ID_PANEL = NS + '-panel';
  const ID_CBTN = NS + '-cbtn';        // 屏幕右缘的圆形按钮：一键触发知乎的「收起」
  const CLS_HIDE = NS + '-hidden';     // 盐选 / 官方广告：直接消失
  const CLS_FOLD = NS + '-folded';     // 疑似软广：折叠（可复核后展开）

  const KEY_ENABLED = NS + ':enabled';
  const KEY_STATS = NS + ':stats';
  const KEY_TRUST = NS + ':trust';     // 已信任的作者 url_token
  const KEY_ALLOW = NS + ':allow';     // 手动放行的内容指纹
  const KEY_SENS = NS + ':sens';

  const LOG = '[净化]';

  /* ---- 0.1 安全存储（隐私模式 / file:// 下 localStorage 会抛异常） ---- */

  const store = (function () {
    const probe = NS + ':probe';
    let ok = true;
    try { localStorage.setItem(probe, '1'); localStorage.removeItem(probe); }
    catch (e) { ok = false; }
    const mem = {};
    return {
      get: function (k) {
        try { return ok ? localStorage.getItem(k) : (k in mem ? mem[k] : null); }
        catch (e) { return k in mem ? mem[k] : null; }
      },
      set: function (k, v) {
        try { if (ok) { localStorage.setItem(k, v); return; } } catch (e) { /* 降级到内存 */ }
        mem[k] = v;
      }
    };
  })();

  function readJSON(key, fallback) {
    try {
      const v = JSON.parse(store.get(key) || 'null');
      return v === null || v === undefined ? fallback : v;
    } catch (e) { return fallback; }
  }

  /* ---- 0.2 状态 ---- */

  let enabled = store.get(KEY_ENABLED) !== '0';
  let sessionNet = 0;
  let sessionDom = 0;

  const stats = (function () {
    const s = readJSON(KEY_STATS, {});
    return {
      yxTotal: s.yxTotal || 0,
      yxNet: s.yxNet || 0,
      yxDom: s.yxDom || 0,
      adTotal: s.adTotal || 0,
      adHide: s.adHide || 0,
      adFold: s.adFold || 0,
      recent: Array.isArray(s.recent) ? s.recent : []
    };
  })();

  const trust = readJSON(KEY_TRUST, []);          // 作者 token 白名单
  const allow = readJSON(KEY_ALLOW, []);          // 内容指纹白名单

  const SENS = {
    loose:  { fold: 70, hide: 120, label: '宽松' },
    normal: { fold: 55, hide: 100, label: '标准' },
    strict: { fold: 40, hide: 70,  label: '严格' }
  };
  let sens = SENS[store.get(KEY_SENS)] ? store.get(KEY_SENS) : 'normal';

  let saveTimer = null;
  function saveStats() {
    if (saveTimer) return;
    saveTimer = setTimeout(function () {
      saveTimer = null;
      store.set(KEY_STATS, JSON.stringify({
        yxTotal: stats.yxTotal, yxNet: stats.yxNet, yxDom: stats.yxDom,
        adTotal: stats.adTotal, adHide: stats.adHide, adFold: stats.adFold,
        recent: stats.recent.slice(0, 16)
      }));
      store.set(KEY_TRUST, JSON.stringify(trust.slice(-200)));
      store.set(KEY_ALLOW, JSON.stringify(allow.slice(-200)));
    }, 400);
  }

  let foldSeq = 0;
  let renderTimer = null;
  function scheduleRender() {
    if (renderTimer) return;
    renderTimer = setTimeout(function () { renderTimer = null; renderUI(); }, 120);
  }

  function bump(channel, kind, title, reasons) {
    if (kind === 'yx') {
      stats.yxTotal++;
      if (channel === 'net') { stats.yxNet++; sessionNet++; } else { stats.yxDom++; sessionDom++; }
    } else {
      stats.adTotal++;
      if (channel === 'net') stats.adHide++;
      else if (reasons && reasons.hide) stats.adHide++;
      else stats.adFold++;
    }
    const entry = { t: String(title || '').slice(0, 60), c: channel, k: kind };
    if (reasons) {
      entry.r = (reasons.text || []).join(' · ').slice(0, 90);
      if (reasons.id) entry.id = reasons.id;
      if (reasons.key) entry.key = reasons.key;
      if (reasons.author) entry.a = reasons.author;   // 作者 token，供"信任该作者"用
    }
    stats.recent.unshift(entry);
    stats.recent = stats.recent.slice(0, 16);
    saveStats();
    scheduleRender();
  }

  function hash(s) {
    let h = 5381;
    for (let i = 0; i < s.length; i++) h = ((h << 5) + h + s.charCodeAt(i)) | 0;
    return (h >>> 0).toString(36);
  }

  /* ============================================================
   * 1. 识别规则
   * ============================================================ */

  /* ---- 1.1 盐选 ---- */

  const YX_URL_RES = [
    /\/xen\/market\//i,
    /\/market\/paid_column\//i,
    /\/paid_column\//i,
    /\/remix\/(paid_column|albums)\//i,
    /\boia\.zhihu\.com/i
  ];
  const YX_TAG_TEXTS = ['盐选专栏', '盐言故事', '盐选故事', '盐选会员', '盐选'];

  const YX_TEXT_RE = /盐选|盐言故事/;
  const YX_TYPE_RE = /paid_column|paid_content|yanxuan|盐选/i;
  const KEY_LABEL_RE = /^(badge|badge_text|label|label_text|tag|tags|type|card_type|content_type|kind|category|action_text|subtitle|sub_title|source_name|filter_type)$/i;

  /* ---- 1.2 官方广告（有硬标识） ---- */

  // 卡片角标里出现这些词 = 官方广告，直接定案（不再看其他信号）
  const AD_HARD_TAG_TEXTS = ['广告', '商业推广', '含商业推广', '赞助内容', '知+'];

  // 接口里判定官方广告：这些字段一旦命中就是板上钉钉
  const AD_BOOL_KEYS = ['is_ad', 'is_promotion', 'is_commercial', 'is_advertisement'];
  const AD_TYPE_VALUES = ['ad', 'advertisement', 'promotion', 'commercial'];

  /* ---- 1.3 带货链接 ---- */

  const COMMERCE_URL_RES = [
    /link\.zhihu\.com/i,        // 知乎站外跳转中转域名，带货/广告专用
    /click\.zhihu\.com/i,
    /item\.jd\.com/i,
    /item\.taobao\.com/i,
    /detail\.tmall\.com/i,
    /youzan\.com/i,
    /union-click/i
  ];

  /* ---- 1.4 引流话术 ---- */

  const CTA_PATTERNS = [
    /私信我|私我|私聊我|加我微信|加微信|加V信|加\s?V\b|微信号/,
    /关注公众号|公众号[:：]|搜索公众号|同名公众号/,
    /评论区?扣\s?[1１一]|扣1|回复\d+领取/,
    /免费领取|领取资料|领取教程|资料包|送你一份|免单/,
    /点击下方|下方链接|下方卡片|戳链接|链接在(评论|主页)/,
    /限时优惠|粉丝专属|内部价|专属优惠|优惠码|折扣码|报我名字/,
    /扫码|长按识别|扫一扫|二维码/,
    /一对一(咨询|指导)|免费咨询|免费试听|预约体验|加群/,
    /橱窗|小黄车|同款链接|某宝|某东/
  ];

  /* ---- 1.5 作者名 / 卡片 --- */

  const AUTHOR_NAME_RES = /(测评|评测|精选|甄选|课堂|教育|培训|咨询|留学|考研|考证|健身|护肤|数码|房产|保险|理财|财税|搬家|装修|口腔|整形)$/;

  const ITEM_SELECTORS = [
    '[data-za-detail-view-path-module="FeedItem"]',
    '.TopstoryItem',
    '.List-item',
    'div[role="listitem"]',
    '.Card'
  ];

  /* ============================================================
   * 2. 通用判定工具
   * ============================================================ */

  // 卡片内是否存在"文本恰好等于某标签"的短叶子节点
  function shortTagHit(card, texts, maxLen) {
    const limit = maxLen || 6;
    const leaves = card.querySelectorAll('span, div, a, em, i, b');
    for (let i = 0; i < leaves.length; i++) {
      const node = leaves[i];
      if (node.children.length) continue;
      const t = (node.textContent || '').trim();
      if (!t || t.length > limit) continue;
      if (texts.indexOf(t) !== -1) return t;
    }
    return '';
  }

  function hitByUrl(card, res) {
    const links = card.querySelectorAll('a[href]');
    for (let i = 0; i < links.length; i++) {
      const href = links[i].getAttribute('href') || '';
      if (!href) continue;
      for (let j = 0; j < res.length; j++) if (res[j].test(href)) return true;
    }
    return false;
  }

  function getAuthor(card) {
    const a = card.querySelector('a[href*="/people/"]');
    if (!a) return { token: '', name: '' };
    const m = (a.getAttribute('href') || '').match(/\/people\/([^/?#]+)/);
    return { token: m ? m[1] : '', name: (a.textContent || '').trim().slice(0, 30) };
  }

  function isOwnUI(el) {
    return !!(el && el.closest &&
      el.closest('#' + ID_PANEL + ', #' + ID_PILL + ', #' + ID_CBTN));
  }

  function looksLikeArticleBody(el) {
    if (el.querySelector('h1')) return true;
    if (el.matches && el.matches('.QuestionHeader, .Post-Header')) return true;
    return false;
  }

  /* ============================================================
   * 3. 网络层
   * ============================================================ */

  const API_RES = [
    /\/api\/v3\/feed\//i,
    /\/api\/v4\/feed\//i,
    /\/api\/v3\/moments/i,
    /\/api\/v4\/moments/i,
    /topstory\/recommend/i
  ];

  function isApiWatched(url) {
    if (!url || typeof url !== 'string') return false;
    return API_RES.some(function (re) { return re.test(url); });
  }

  function looksLikeFeedItem(node) {
    if (!node || typeof node !== 'object' || Array.isArray(node)) return false;
    if ('target' in node || 'card_type' in node) return true;
    if (typeof node.type === 'string' && (node.id || node.data)) return true;
    return false;
  }

  /**
   * 盐选判定：只看 URL 值 + 标签类/类型类字段的值，
   * 绝不扫标题正文 —— 否则标题里带"盐选"的正常内容会被误删。
   */
  function isYanxuanItem(item) {
    let hit = false;
    const walk = function (v, key, depth) {
      if (hit || depth > 6 || v === null || v === undefined) return;
      if (typeof v === 'string') {
        if (/^https?:\/\//i.test(v)) {
          if (YX_URL_RES.some(function (re) { return re.test(v); })) hit = true;
          return;
        }
        if (key && KEY_LABEL_RE.test(key)) {
          if (YX_TEXT_RE.test(v) || YX_TYPE_RE.test(v)) hit = true;
        }
        return;
      }
      if (Array.isArray(v)) { for (let i = 0; i < v.length; i++) walk(v[i], key, depth + 1); return; }
      if (typeof v === 'object') {
        for (const k in v) if (Object.prototype.hasOwnProperty.call(v, k)) walk(v[k], k, depth + 1);
      }
    };
    try { walk(item, '', 0); } catch (e) { return false; }
    return hit;
  }

  /** 官方广告判定：布尔位 / 类型位命中即可，不猜。 */
  function isOfficialAd(item) {
    try {
      for (let i = 0; i < AD_BOOL_KEYS.length; i++) {
        if (item[AD_BOOL_KEYS[i]] === true) return true;
        const t = item.target;
        if (t && t[AD_BOOL_KEYS[i]] === true) return true;
      }
      const typeKeys = ['type', 'card_type', 'feed_card_type', 'content_type'];
      for (let i = 0; i < typeKeys.length; i++) {
        const a = item[typeKeys[i]];
        const b = item.target && item.target[typeKeys[i]];
        if (typeof a === 'string' && AD_TYPE_VALUES.indexOf(a.toLowerCase()) !== -1) return true;
        if (typeof b === 'string' && AD_TYPE_VALUES.indexOf(b.toLowerCase()) !== -1) return true;
      }
      return false;
    } catch (e) { return false; }
  }

  function pickTitle(item) {
    try {
      const c = [
        item.title,
        item.target && item.target.title,
        item.object && item.object.title,
        item.target && item.target.question && item.target.question.title,
        item.feed_title
      ];
      for (let i = 0; i < c.length; i++) {
        if (typeof c[i] === 'string' && c[i].trim()) return c[i].trim();
      }
    } catch (e) { /* ignore */ }
    return '';
  }

  /** 过滤响应体；返回 null 表示没动过。任何异常都放行原数据。 */
  function filterPayload(text) {
    if (!text || typeof text !== 'string') return null;

    if (text.indexOf('盐选') === -1 &&
        text.indexOf('盐言故事') === -1 &&
        text.indexOf('/xen/market/') === -1 &&
        text.indexOf('paid_column') === -1 &&
        text.indexOf('"is_ad"') === -1 &&
        text.indexOf('"ad_info"') === -1) {
      return null;
    }

    let json;
    try { json = JSON.parse(text); } catch (e) { return null; }

    let removed = 0;

    const walk = function (node, depth) {
      if (!node || typeof node !== 'object' || depth > 8) return;

      if (Array.isArray(node)) {
        for (let i = node.length - 1; i >= 0; i--) {
          const item = node[i];
          let kind = null;
          if (looksLikeFeedItem(item)) {
            if (isYanxuanItem(item)) kind = 'yx';
            else if (isOfficialAd(item)) kind = 'ad';
          }
          if (kind) {
            bump('net', kind, pickTitle(item));
            node.splice(i, 1);
            removed++;
          } else {
            walk(item, depth + 1);
          }
        }
        return;
      }

      for (const k in node) {
        if (Object.prototype.hasOwnProperty.call(node, k)) walk(node[k], depth + 1);
      }
    };

    try { walk(json, 0); } catch (e) { return null; }
    return removed > 0 ? { data: json, removed: removed } : null;
  }

  function installFetchHook() {
    if (typeof window.fetch !== 'function') return;
    const native = window.fetch;

    window.fetch = function (input, init) {
      const url = (typeof input === 'string') ? input : (input && input.url) || '';
      const p = native.apply(this, arguments);
      if (!enabled || !isApiWatched(url)) return p;

      return p.then(function (res) {
        try {
          if (!res || !res.ok) return res;
          return res.clone().text().then(function (text) {
            const out = filterPayload(text);
            if (!out) return res;
            const headers = new Headers(res.headers);
            headers.delete('content-length');
            console.log(LOG, '网络层拦截', out.removed, '条');
            return new Response(JSON.stringify(out.data), {
              status: res.status, statusText: res.statusText, headers: headers
            });
          }).catch(function () { return res; });
        } catch (e) { return res; }
      });
    };
  }

  function installXHRHook() {
    const proto = XMLHttpRequest.prototype;
    const rawOpen = proto.open;
    const rawSend = proto.send;
    if (typeof rawOpen !== 'function' || typeof rawSend !== 'function') return;

    proto.open = function () {
      this[NS + '_url'] = arguments[1];
      this[NS + '_done'] = false;
      return rawOpen.apply(this, arguments);
    };

    proto.send = function () {
      const xhr = this;
      // 钩子必须在 open 阶段挂上，才能比业务代码的 onload 更早拿到响应
      if (enabled && isApiWatched(xhr[NS + '_url'] || '')) {
        xhr.addEventListener('readystatechange', function () {
          if (xhr.readyState !== 4 || xhr[NS + '_done']) return;
          xhr[NS + '_done'] = true;
          try {
            const type = xhr.responseType;
            if (type && type !== 'text' && type !== 'json') return;
            const raw = (type === 'json') ? JSON.stringify(xhr.response) : xhr.responseText;
            if (!raw) return;
            const out = filterPayload(raw);
            if (!out) return;
            const text = JSON.stringify(out.data);
            Object.defineProperty(xhr, 'responseText', { configurable: true, get: function () { return text; } });
            Object.defineProperty(xhr, 'response', { configurable: true, get: function () { return type === 'json' ? out.data : text; } });
            console.log(LOG, '网络层拦截(XHR)', out.removed, '条');
          } catch (e) { /* 放行 */ }
        });
      }
      return rawSend.apply(this, arguments);
    };
  }

  /* ============================================================
   * 4. 软广打分
   * ============================================================ */

  /**
   * 多信号累加打分。没有单一规则能定义"软广"，
   * 所以每条规则只贡献一点权重，总分过阈值才动作。
   */
  function scoreAd(card, text) {
    let score = 0;
    const why = [];

    // 1) 官方广告标识 —— 这一条就足以定案
    const hardTag = shortTagHit(card, AD_HARD_TAG_TEXTS, 6);
    if (hardTag) { score += 100; why.push('带「' + hardTag + '」标识'); }

    // 2) 带货 / 站外跳转链接
    if (hitByUrl(card, COMMERCE_URL_RES)) { score += 45; why.push('含站外带货链接'); }

    // 3) 引流话术：命中越多分越高
    const ctaHits = [];
    for (let i = 0; i < CTA_PATTERNS.length; i++) {
      const m = text.match(CTA_PATTERNS[i]);
      if (m) ctaHits.push(m[0]);
    }
    if (ctaHits.length) {
      score += ctaHits.length * 14;
      why.push('引流话术「' + ctaHits.slice(0, 2).join('、') + '」');
    }

    // 4) 机构号角标
    if (shortTagHit(card, ['机构号'], 5)) { score += 18; why.push('机构号'); }

    // 5) 作者名像营销号
    const author = getAuthor(card);
    if (author.name && AUTHOR_NAME_RES.test(author.name)) { score += 10; why.push('作者名像营销号'); }

    // 6) 正文反复出现价格
    const prices = text.match(/[¥￥]\s?\d+/g);
    if (prices && prices.length >= 2) { score += 12; why.push('多次出现价格'); }

    return { score: score, why: why, author: author };
  }

  /* ============================================================
   * 5. 页面层执行
   * ============================================================ */

  function cardKey(card) {
    const a = getAuthor(card);
    const text = (card.textContent || '').replace(/\s+/g, ' ').trim();
    return hash(a.token + '|' + text.slice(0, 40));
  }

  function hideYanxuan(card) {
    if (card.offsetHeight > window.innerHeight * 1.2) return false;
    if (looksLikeArticleBody(card)) return false;
    if (card.classList.contains(CLS_HIDE)) return false;
    card.classList.add(CLS_HIDE);
    const h = card.querySelector('h1, h2, h3');
    bump('dom', 'yx', h ? h.textContent.trim() : '');
    return true;
  }

  function foldAd(card, res, hide) {
    if (card.offsetHeight > window.innerHeight * 1.2) return false;
    if (looksLikeArticleBody(card)) return false;
    if (card.classList.contains(CLS_FOLD) || card.classList.contains(CLS_HIDE)) return false;

    const key = cardKey(card);
    if (allow.indexOf(key) !== -1) return false;

    const id = 'f' + (++foldSeq);
    card.dataset[NS + 'Id'] = id;
    card.dataset[NS + 'Key'] = key;
    card.classList.add(hide ? CLS_HIDE : CLS_FOLD);

    const h = card.querySelector('h1, h2, h3');
    const au = getAuthor(card);
    bump('dom', 'ad', h ? h.textContent.trim() : '', {
      text: res.why, hide: hide, id: id, key: key, author: au.token
    });
    return true;
  }

  function scan() {
    if (!enabled) return;

    const cand = new Set();

    // 5.1 从盐选链接反查卡片
    const anchors = document.querySelectorAll(
      'a[href*="xen/market"], a[href*="paid_column"], a[href*="remix"], a[href*="oia.zhihu.com"]'
    );
    for (let i = 0; i < anchors.length; i++) {
      const c = findCard(anchors[i]);
      if (c) cand.add(c);
    }

    // 5.2 所有信息流卡片
    const cards = document.querySelectorAll(ITEM_SELECTORS.join(','));
    for (let i = 0; i < cards.length; i++) cand.add(cards[i]);

    // 5.3 只保留"最内层"候选，避免把整个信息流容器当成一张卡片
    const list = [];
    cand.forEach(function (c) { if (!isOwnUI(c)) list.push(c); });
    const inner = list.filter(function (c) {
      for (let i = 0; i < list.length; i++) {
        if (list[i] !== c && c.contains(list[i])) return false;
      }
      return true;
    });

    const th = SENS[sens];

    for (let i = 0; i < inner.length; i++) {
      const card = inner[i];

      // 盐选 / 官方广告角标 → 直接隐藏
      if (!card.classList.contains(CLS_HIDE) &&
          (hitByUrl(card, YX_URL_RES) || shortTagHit(card, YX_TAG_TEXTS, 6))) {
        hideYanxuan(card);
        continue;
      }
      if (!card.classList.contains(CLS_HIDE) &&
          shortTagHit(card, AD_HARD_TAG_TEXTS, 6)) {
        foldAd(card, { score: 100, why: ['带官方广告标识'] }, true);
        continue;
      }
      if (card.classList.contains(CLS_HIDE) || card.classList.contains(CLS_FOLD)) continue;

      // 软广打分
      const author = getAuthor(card);
      if (author.token && trust.indexOf(author.token) !== -1) continue;

      const text = (card.textContent || '').replace(/\s+/g, ' ');
      if (text.length < 12) continue;

      const res = scoreAd(card, text);
      if (res.score >= th.hide) foldAd(card, res, true);
      else if (res.score >= th.fold) foldAd(card, res, false);
    }
  }

  function findCard(node) {
    if (isOwnUI(node)) return null;
    let el = node;
    while (el && el !== document.body && el.parentElement) {
      for (let i = 0; i < ITEM_SELECTORS.length; i++) {
        if (el.matches && el.matches(ITEM_SELECTORS[i])) return el;
      }
      el = el.parentElement;
    }
    el = node;
    while (el && el !== document.body && el.parentElement) {
      const parent = el.parentElement;
      let sameTag = 0;
      for (let i = 0; i < parent.children.length; i++) {
        if (parent.children[i].tagName === el.tagName) sameTag++;
      }
      const h = el.offsetHeight;
      if (sameTag >= 2 && h > 60 && h < window.innerHeight * 1.2) return el;
      el = parent;
    }
    return null;
  }

  function releaseAll() {
    const els = document.querySelectorAll('.' + CLS_HIDE + ', .' + CLS_FOLD);
    for (let i = 0; i < els.length; i++) els[i].classList.remove(CLS_HIDE, CLS_FOLD);
  }

  /* ============================================================
   * 5.5 一键收起
   *
   * 知乎文章 / 回答的「收起」按钮长在正文末尾，长文要滚很久才够得着。
   * 这里不去改知乎的 DOM，只是替你去点它 —— 找到按钮、派发一次真实点击。
   * ============================================================ */

  const COLLAPSE_TEXTS = ['收起', '收起全文'];
  const CLICKABLE_SEL = 'button, [role="button"], .Button, .Button--plain';
  const CLICK_SEQ = ['pointerdown', 'mousedown', 'pointerup', 'mouseup', 'click'];

  function isVisible(el) {
    try {
      const r = el.getBoundingClientRect();
      if (r.width < 4 || r.height < 4) return false;
      let n = el, d = 0;
      while (n && n.nodeType === 1 && d++ < 12) {
        const cs = window.getComputedStyle ? window.getComputedStyle(n) : null;
        if (cs) {
          const op = cs.opacity;
          if (cs.display === 'none' || cs.visibility === 'hidden' ||
              (op !== '' && op !== undefined && Number(op) === 0)) {
            return false;
          }
        }
        n = n.parentElement;
      }
      return true;
    } catch (e) { return false; }
  }

  /**
   * 找知乎的「收起」按钮。
   * 取离视口中心最近的那个 —— 多回答页面上，你正看着哪个，收起的就是哪个。
   */
  function findCollapseTarget() {
    let all;
    try { all = document.querySelectorAll(CLICKABLE_SEL); } catch (e) { return null; }

    const vc = (window.innerHeight || 800) / 2;
    let best = null, bestD = Infinity;

    for (let i = 0; i < all.length; i++) {
      const el = all[i];
      if (isOwnUI(el)) continue;
      const t = (el.textContent || '').trim();
      if (COLLAPSE_TEXTS.indexOf(t) === -1) continue;
      if (!isVisible(el)) continue;

      let d;
      try {
        const r = el.getBoundingClientRect();
        d = Math.abs(r.top + r.height / 2 - vc);
      } catch (e) { d = 1e9; }
      if (d < bestD) { bestD = d; best = el; }
    }
    return best;
  }

  /**
   * 派发完整的指针 / 鼠标事件序列。
   * 知乎用 React 合成事件，只调 el.click() 有时不生效，
   * 所以按 pointerdown → mousedown → pointerup → mouseup → click 走一遍。
   */
  function simulateClick(el) {
    let r = { left: 0, top: 0, width: 0, height: 0 };
    try { r = el.getBoundingClientRect(); } catch (e) { /* 用默认值 */ }
    const base = {
      bubbles: true, cancelable: true, view: window,
      clientX: Math.round(r.left + r.width / 2),
      clientY: Math.round(r.top + r.height / 2)
    };
    for (let i = 0; i < CLICK_SEQ.length; i++) {
      try { el.dispatchEvent(new MouseEvent(CLICK_SEQ[i], base)); }
      catch (e) { /* 单个事件失败不影响后续 */ }
    }
  }

  let cbtnShown = false;

  /** 页面上有「收起」才显示圆按钮；面板打开时让位给面板。 */
  function updateCollapseButton() {
    const btn = document.getElementById(ID_CBTN);
    if (!btn) return;
    const panel = document.getElementById(ID_PANEL);
    const hit = !(panel && panel.classList.contains('zhyx-open')) && !!findCollapseTarget();
    if (hit === cbtnShown) return;
    cbtnShown = hit;
    btn.classList.toggle('zhyx-show', hit);
  }

  /* ============================================================
   * 6. 界面
   * ============================================================ */

  const CSS = `
.${CLS_HIDE} { display: none !important; }
.${CLS_FOLD} { display: none !important; }

#${ID_PILL} {
  /* bottom 从 22px 上调到 108px，避开知乎页面底部自带的「收起」按钮 */
  position: fixed; right: 18px; bottom: 108px; z-index: 2147483647;
  display: flex; align-items: center; gap: 7px;
  padding: 8px 14px;
  font: 500 12px/1 -apple-system, "Microsoft YaHei", "PingFang SC", sans-serif;
  color: #0C447C;
  background: rgba(255,255,255,.62);
  -webkit-backdrop-filter: blur(14px) saturate(180%);
  backdrop-filter: blur(14px) saturate(180%);
  border: 1px solid rgba(255,255,255,.75);
  border-radius: 999px;
  box-shadow: 0 2px 12px rgba(0,0,0,.10);
  cursor: pointer; user-select: none;
  transition: transform .15s ease, opacity .2s ease;
}
#${ID_PILL}:hover { transform: translateY(-2px); }
#${ID_PILL} .zhyx-dot { width: 6px; height: 6px; border-radius: 50%; background: #1D9E75; flex: 0 0 auto; }
#${ID_PILL}.zhyx-off .zhyx-dot { background: #B4B2A9; }
#${ID_PILL}.zhyx-off { color: #5F5E5A; }
#${ID_PILL}.zhyx-hidden-pill { opacity: 0; pointer-events: none; }

/* ---- 屏幕右缘圆形按钮：一键触发知乎文章底部的「收起」 ---- */
#${ID_CBTN} {
  position: fixed; right: 16px; top: 50%;
  width: 44px; height: 44px; margin-top: -22px;
  z-index: 2147483645; box-sizing: border-box;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  color: #0C447C;
  background: rgba(255,255,255,.62);
  -webkit-backdrop-filter: blur(14px) saturate(180%);
  backdrop-filter: blur(14px) saturate(180%);
  border: 1px solid rgba(255,255,255,.75);
  box-shadow: 0 2px 12px rgba(0,0,0,.10);
  cursor: pointer; user-select: none;
  opacity: 0; pointer-events: none; transform: translateX(10px);
  transition: opacity .2s ease, transform .2s ease, background .15s ease;
}
#${ID_CBTN}.zhyx-show { opacity: 1; pointer-events: auto; transform: translateX(0); }
#${ID_CBTN}.zhyx-show:hover { transform: translateX(-3px); background: rgba(255,255,255,.88); }
#${ID_CBTN}.zhyx-tap { transform: translateX(-3px) scale(.88); }
#${ID_CBTN} svg { width: 20px; height: 20px; display: block; }

#${ID_PANEL} {
  position: fixed; top: 0; right: 0; bottom: 0; width: 336px;
  z-index: 2147483646; box-sizing: border-box;
  padding: 22px 20px 28px; overflow-y: auto;
  font: 400 13px/1.6 -apple-system, "Microsoft YaHei", "PingFang SC", sans-serif;
  color: #1F2937;
  background: rgba(255,255,255,.58);
  -webkit-backdrop-filter: blur(22px) saturate(180%);
  backdrop-filter: blur(22px) saturate(180%);
  border-left: 1px solid rgba(255,255,255,.7);
  box-shadow: -10px 0 40px rgba(0,0,0,.13);
  transform: translateX(102%);
  transition: transform .3s cubic-bezier(.22,.61,.36,1);
}
#${ID_PANEL}.zhyx-open { transform: translateX(0); }
#${ID_PANEL} .zhyx-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
#${ID_PANEL} .zhyx-title { font-size: 14px; font-weight: 500; color: #0C447C; }
#${ID_PANEL} .zhyx-close {
  width: 24px; height: 24px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px; color: #5F5E5A; cursor: pointer;
  background: rgba(255,255,255,.55); border: 1px solid rgba(0,0,0,.06);
}
#${ID_PANEL} .zhyx-close:hover { background: #FFFFFF; }
#${ID_PANEL} .zhyx-sec {
  font-size: 11px; color: #5F5E5A; letter-spacing: .06em;
  margin: 18px 0 8px 2px;
}
#${ID_PANEL} .zhyx-sec:first-of-type { margin-top: 0; }
#${ID_PANEL} .zhyx-hero {
  padding: 16px; border-radius: 14px; margin-bottom: 10px;
  background: rgba(255,255,255,.55); border: 1px solid rgba(255,255,255,.8);
}
#${ID_PANEL} .zhyx-num {
  font-size: 32px; font-weight: 500; line-height: 1.1; color: #185FA5;
  font-variant-numeric: tabular-nums;
}
#${ID_PANEL} .zhyx-hero-ad .zhyx-num { color: #993C1D; }
#${ID_PANEL} .zhyx-unit { font-size: 12px; color: #5F5E5A; margin-top: 3px; }
#${ID_PANEL} .zhyx-split { display: flex; gap: 10px; margin-bottom: 4px; }
#${ID_PANEL} .zhyx-cell {
  flex: 1; padding: 10px 12px; border-radius: 11px;
  background: rgba(255,255,255,.5); border: 1px solid rgba(255,255,255,.75);
}
#${ID_PANEL} .zhyx-cell b {
  display: block; font-size: 16px; font-weight: 500; color: #1F2937;
  font-variant-numeric: tabular-nums;
}
#${ID_PANEL} .zhyx-cell span { font-size: 11px; color: #5F5E5A; }
#${ID_PANEL} .zhyx-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; border-radius: 11px; margin-top: 10px;
  background: rgba(255,255,255,.5); border: 1px solid rgba(255,255,255,.75);
}
#${ID_PANEL} .zhyx-seg { display: flex; gap: 2px; padding: 2px; border-radius: 8px; background: rgba(0,0,0,.05); }
#${ID_PANEL} .zhyx-seg i {
  font-style: normal; font-size: 11px; padding: 3px 9px; border-radius: 6px;
  cursor: pointer; color: #5F5E5A;
}
#${ID_PANEL} .zhyx-seg i.zhyx-sel { background: #FFFFFF; color: #0C447C; font-weight: 500; }
#${ID_PANEL} .zhyx-switch {
  width: 40px; height: 22px; border-radius: 999px; background: #B4B2A9;
  position: relative; cursor: pointer; transition: background .2s ease; flex: 0 0 auto;
}
#${ID_PANEL} .zhyx-switch.zhyx-on { background: #1D9E75; }
#${ID_PANEL} .zhyx-switch i {
  position: absolute; top: 3px; left: 3px; width: 16px; height: 16px;
  border-radius: 50%; background: #FFFFFF; transition: transform .2s ease;
}
#${ID_PANEL} .zhyx-switch.zhyx-on i { transform: translateX(18px); }
#${ID_PANEL} .zhyx-recent {
  border-radius: 11px; overflow: hidden; min-height: 56px;
  background: rgba(255,255,255,.45); border: 1px solid rgba(255,255,255,.7);
}
#${ID_PANEL} .zhyx-item {
  display: flex; align-items: flex-start; gap: 7px;
  padding: 9px 12px; font-size: 12px; line-height: 1.5;
  border-bottom: 1px solid rgba(0,0,0,.05);
}
#${ID_PANEL} .zhyx-item:last-child { border-bottom: none; }
#${ID_PANEL} .zhyx-item em {
  font-style: normal; flex: 0 0 auto; padding: 1px 5px; border-radius: 4px; font-size: 10px;
  background: #E6F1FB; color: #185FA5;
}
#${ID_PANEL} .zhyx-item em.zhyx-k-ad { background: #FAECE7; color: #993C1D; }
#${ID_PANEL} .zhyx-item p {
  margin: 0; flex: 1; min-width: 0; color: #374151;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
#${ID_PANEL} .zhyx-why { display: block; color: #9CA3AF; font-size: 11px; margin-top: 2px; }
#${ID_PANEL} .zhyx-acts { display: flex; gap: 6px; flex: 0 0 auto; }
#${ID_PANEL} .zhyx-act {
  font-size: 10px; padding: 2px 6px; border-radius: 5px; cursor: pointer;
  color: #5F5E5A; background: rgba(255,255,255,.7); border: 1px solid rgba(0,0,0,.07);
}
#${ID_PANEL} .zhyx-act:hover { color: #0C447C; border-color: #B5D4F4; }
#${ID_PANEL} .zhyx-empty { padding: 18px 12px; text-align: center; font-size: 12px; color: #9CA3AF; }
#${ID_PANEL} .zhyx-foot {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 12px; font-size: 11px; color: #5F5E5A;
}
#${ID_PANEL} .zhyx-reset {
  cursor: pointer; padding: 5px 10px; border-radius: 7px;
  border: 1px solid rgba(0,0,0,.07); background: rgba(255,255,255,.5);
}
#${ID_PANEL} .zhyx-reset:hover { color: #A32D2D; }

@media (prefers-color-scheme: dark) {
  #${ID_PANEL} { color: #E8E8E6; background: rgba(28,28,30,.55); border-left-color: rgba(255,255,255,.12); }
  #${ID_PANEL} .zhyx-title { color: #85B7EB; }
  #${ID_PANEL} .zhyx-hero, #${ID_PANEL} .zhyx-cell, #${ID_PANEL} .zhyx-row, #${ID_PANEL} .zhyx-recent {
    background: rgba(255,255,255,.07); border-color: rgba(255,255,255,.1);
  }
  #${ID_PANEL} .zhyx-num { color: #85B7EB; }
  #${ID_PANEL} .zhyx-hero-ad .zhyx-num { color: #F0997B; }
  #${ID_PANEL} .zhyx-cell b { color: #E8E8E6; }
  #${ID_PANEL} .zhyx-unit, #${ID_PANEL} .zhyx-cell span, #${ID_PANEL} .zhyx-sec { color: #A0A0A0; }
  #${ID_PANEL} .zhyx-item p { color: #D0D0CE; }
  #${ID_PANEL} .zhyx-item { border-bottom-color: rgba(255,255,255,.07); }
  #${ID_PANEL} .zhyx-close, #${ID_PANEL} .zhyx-act, #${ID_PANEL} .zhyx-reset {
    background: rgba(255,255,255,.1); color: #C0C0C0; border-color: rgba(255,255,255,.12);
  }
  #${ID_PANEL} .zhyx-seg { background: rgba(255,255,255,.08); }
  #${ID_PANEL} .zhyx-seg i.zhyx-sel { background: rgba(255,255,255,.16); color: #B5D4F4; }
  #${ID_PILL} { color: #B5D4F4; background: rgba(28,28,30,.6); border-color: rgba(255,255,255,.14); }
  #${ID_CBTN} { color: #B5D4F4; background: rgba(28,28,30,.6); border-color: rgba(255,255,255,.14); }
  #${ID_CBTN}.zhyx-show:hover { background: rgba(50,50,54,.85); }
}
`;

  function injectCSS() {
    const head = document.head || document.documentElement;
    if (!head || document.getElementById(NS + '-style')) return;
    const s = document.createElement('style');
    s.id = NS + '-style';
    s.textContent = CSS;
    head.appendChild(s);
  }

  function escapeHtml(s) {
    return String(s).replace(/[&<>"']/g, function (c) {
      return { '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[c];
    });
  }

  let lastSignature = '';

  function renderUI() {
    const pill = document.getElementById(ID_PILL);
    const panel = document.getElementById(ID_PANEL);
    if (!pill || !panel) return;

    const sig = [
      enabled, sens, stats.yxTotal, stats.yxNet, stats.yxDom,
      stats.adTotal, stats.adHide, stats.adFold,
      stats.recent.length, trust.length
    ].join('|');
    if (sig === lastSignature) return;
    lastSignature = sig;

    pill.classList.toggle('zhyx-off', !enabled);
    pill.querySelector('.zhyx-label').textContent =
      '已屏蔽 ' + (stats.yxTotal + stats.adTotal) + (enabled ? '' : ' · 暂停');

    panel.querySelector('#zhyx-num').textContent = String(stats.yxTotal);
    panel.querySelector('#zhyx-net').textContent = String(stats.yxNet);
    panel.querySelector('#zhyx-dom').textContent = String(stats.yxDom);
    panel.querySelector('#zhyx-adnum').textContent = String(stats.adTotal);
    panel.querySelector('#zhyx-adhide').textContent = String(stats.adHide);
    panel.querySelector('#zhyx-adfold').textContent = String(stats.adFold);
    panel.querySelector('.zhyx-switch').classList.toggle('zhyx-on', enabled);
    panel.querySelector('#zhyx-trustcount').textContent = '已信任 ' + trust.length + ' 位作者';

    const segs = panel.querySelectorAll('#zhyx-sens i');
    for (let i = 0; i < segs.length; i++) {
      segs[i].classList.toggle('zhyx-sel', segs[i].getAttribute('data-v') === sens);
    }

    const box = panel.querySelector('#zhyx-recent');
    if (!stats.recent.length) {
      box.innerHTML = '<div class="zhyx-empty">还没有拦到东西<br>刷一刷推荐流试试</div>';
    } else {
      box.innerHTML = stats.recent.map(function (r) {
        const kindCls = r.k === 'ad' ? ' zhyx-k-ad' : '';
        const kindTxt = r.k === 'ad' ? '软广' : '盐选';
        const acts = (r.k === 'ad' && r.id)
          ? '<span class="zhyx-acts">' +
            (r.a ? '<span class="zhyx-act" data-act="trust" data-a="' + escapeHtml(r.a) + '">信任</span>' : '') +
            '<span class="zhyx-act" data-act="show" data-id="' + r.id + '">显示</span>' +
            '</span>'
          : '';
        return '<div class="zhyx-item">' +
          '<em class="' + kindCls.trim() + '">' + kindTxt + '</em>' +
          '<p>' + escapeHtml(r.t || '(无标题)') +
          (r.r ? '<span class="zhyx-why">' + escapeHtml(r.r) + '</span>' : '') +
          '</p>' + acts + '</div>';
      }).join('');
    }
  }

  function buildUI() {
    if (!document.body || document.getElementById(ID_PILL)) return;

    const pill = document.createElement('div');
    pill.id = ID_PILL;
    pill.innerHTML = '<span class="zhyx-dot"></span><span class="zhyx-label">已屏蔽 0</span>';
    pill.addEventListener('click', function (e) { e.stopPropagation(); togglePanel(true); });

    // 屏幕右缘的圆形按钮：一键触发知乎的「收起」
    const cbtn = document.createElement('div');
    cbtn.id = ID_CBTN;
    cbtn.title = '收起（代替文章底部难以点击的「收起」）';
    cbtn.innerHTML =
      '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" ' +
      'stroke-linecap="round" stroke-linejoin="round">' +
      '<path d="M5 13.5l7-7 7 7"/><path d="M5 19.5l7-7 7 7"/></svg>';
    cbtn.addEventListener('click', function (e) {
      e.stopPropagation();
      const target = findCollapseTarget();
      if (!target) return;
      simulateClick(target);
      cbtn.classList.add('zhyx-tap');
      setTimeout(function () { cbtn.classList.remove('zhyx-tap'); }, 160);
    });

    const panel = document.createElement('div');
    panel.id = ID_PANEL;
    panel.innerHTML =
      '<div class="zhyx-head">' +
        '<span class="zhyx-title">知乎内容净化</span>' +
        '<span class="zhyx-close" title="收起">×</span>' +
      '</div>' +

      '<div class="zhyx-sec">盐选</div>' +
      '<div class="zhyx-hero">' +
        '<div class="zhyx-num" id="zhyx-num">0</div>' +
        '<div class="zhyx-unit">条盐选内容已屏蔽（累计）</div>' +
      '</div>' +
      '<div class="zhyx-split">' +
        '<div class="zhyx-cell"><b id="zhyx-net">0</b><span>网络层拦截 · 本次</span></div>' +
        '<div class="zhyx-cell"><b id="zhyx-dom">0</b><span>页面层隐藏 · 本次</span></div>' +
      '</div>' +

      '<div class="zhyx-sec">软广</div>' +
      '<div class="zhyx-hero zhyx-hero-ad">' +
        '<div class="zhyx-num" id="zhyx-adnum">0</div>' +
        '<div class="zhyx-unit">条广告内容已处理（累计）</div>' +
      '</div>' +
      '<div class="zhyx-split">' +
        '<div class="zhyx-cell"><b id="zhyx-adhide">0</b><span>官方广告 · 隐藏</span></div>' +
        '<div class="zhyx-cell"><b id="zhyx-adfold">0</b><span>疑似软广 · 折叠</span></div>' +
      '</div>' +

      '<div class="zhyx-row">' +
        '<span>识别灵敏度</span>' +
        '<div class="zhyx-seg" id="zhyx-sens">' +
          '<i data-v="loose">宽松</i><i data-v="normal">标准</i><i data-v="strict">严格</i>' +
        '</div>' +
      '</div>' +
      '<div class="zhyx-row">' +
        '<span>屏蔽开关</span>' +
        '<div class="zhyx-switch"><i></i></div>' +
      '</div>' +

      '<div class="zhyx-sec">最近处理</div>' +
      '<div class="zhyx-recent" id="zhyx-recent"></div>' +
      '<div class="zhyx-foot">' +
        '<span id="zhyx-trustcount">已信任 0 位作者</span>' +
        '<span class="zhyx-reset">清空统计</span>' +
      '</div>';

    panel.querySelector('.zhyx-close').addEventListener('click', function (e) {
      e.stopPropagation(); togglePanel(false);
    });

    panel.querySelector('.zhyx-switch').addEventListener('click', function (e) {
      e.stopPropagation();
      enabled = !enabled;
      store.set(KEY_ENABLED, enabled ? '1' : '0');
      if (enabled) scan(); else releaseAll();
      lastSignature = ''; renderUI();
    });

    panel.querySelector('#zhyx-sens').addEventListener('click', function (e) {
      e.stopPropagation();
      const v = e.target && e.target.getAttribute && e.target.getAttribute('data-v');
      if (!v || !SENS[v]) return;
      sens = v;
      store.set(KEY_SENS, v);
      releaseAll();
      scan();
      lastSignature = ''; renderUI();
    });

    panel.querySelector('.zhyx-reset').addEventListener('click', function (e) {
      e.stopPropagation();
      stats.yxTotal = stats.yxNet = stats.yxDom = 0;
      stats.adTotal = stats.adHide = stats.adFold = 0;
      stats.recent = [];
      sessionNet = sessionDom = 0;
      allow.length = 0;
      saveStats();
      lastSignature = ''; renderUI();
    });

    const recentBox = panel.querySelector('#zhyx-recent');
    recentBox.addEventListener('click', function (e) {
      e.stopPropagation();
      const el = e.target.closest ? e.target.closest('.zhyx-act') : null;
      if (!el) return;
      const act = el.getAttribute('data-act');

      // 信任该作者：加入白名单，并把这张卡放出来
      if (act === 'trust') {
        const t = el.getAttribute('data-a');
        if (t && trust.indexOf(t) === -1) trust.push(t);
        const cid = el.closest('.zhyx-item') &&
          el.closest('.zhyx-item').querySelector('[data-id]');
        if (cid) {
          const card = document.querySelector('[data-' + NS + '-id="' + cid.getAttribute('data-id') + '"]');
          if (card) card.classList.remove(CLS_FOLD, CLS_HIDE);
        }
        saveStats();
        lastSignature = '';
        renderUI();
        return;
      }

      // 显示这一条：内容指纹进白名单，避免下一轮又被折回去
      const id = el.getAttribute('data-id');
      if (!id) return;
      const card = document.querySelector('[data-' + NS + '-id="' + id + '"]');
      if (!card) return;
      const key = card.getAttribute('data-' + NS + '-key');
      if (key && allow.indexOf(key) === -1) allow.push(key);
      card.classList.remove(CLS_FOLD, CLS_HIDE);
      saveStats();
      el.textContent = '已显示';
      el.style.pointerEvents = 'none';
    });

    panel.addEventListener('click', function (e) { e.stopPropagation(); });
    document.body.appendChild(panel);
    document.body.appendChild(pill);
    document.body.appendChild(cbtn);
    lastSignature = '';
    renderUI();
  }

  function togglePanel(open) {
    const panel = document.getElementById(ID_PANEL);
    const pill = document.getElementById(ID_PILL);
    if (!panel) return;
    panel.classList.toggle('zhyx-open', open !== false);
    if (pill) pill.classList.toggle('zhyx-hidden-pill', open !== false);
    updateCollapseButton();   // 面板打开时圆按钮让位
  }

  /* ============================================================
   * 7. 启动
   * ============================================================ */

  let scanTimer = null;
  function schedule() {
    if (scanTimer) return;
    scanTimer = setTimeout(function () { scanTimer = null; scan(); }, 250);
  }

  function start() {
    injectCSS();
    installFetchHook();
    installXHRHook();
    buildUI();
    scan();
    updateCollapseButton();   // 首屏立刻判一次，否则要等第一轮轮询

    const target = document.body || document.documentElement;
    if (window.MutationObserver && target) {
      const mo = new MutationObserver(function (records) {
        for (let i = 0; i < records.length; i++) {
          const t = records[i].target;
          const node = t && t.nodeType === 1 ? t : (t ? t.parentElement : null);
          if (isOwnUI(node)) continue;
          schedule();
          return;
        }
      });
      mo.observe(target, { childList: true, subtree: true });
    }

    setInterval(function () {
      updateCollapseButton();       // 圆按钮独立于屏蔽开关，关掉屏蔽也能用
      if (!enabled) return;
      scan();
      renderUI();
    }, 1500);

    let lastHref = location.href;
    setInterval(function () {
      if (location.href === lastHref) return;
      lastHref = location.href;
      releaseAll();
      setTimeout(function () {
        injectCSS();
        buildUI();
        togglePanel(false);
        scan();
        updateCollapseButton();   // SPA 路由切换后立刻判一次，别等 1.5s 轮询
      }, 400);
    }, 600);

    document.addEventListener('click', function (e) {
      const t = e.target;
      if (t && t.closest && t.closest('#' + ID_PANEL + ', #' + ID_PILL + ', #' + ID_CBTN)) return;
      togglePanel(false);
    }, true);

    console.log(LOG, 'v3.1.0 已加载，状态：' + (enabled ? '开' : '关') + '，灵敏度：' + SENS[sens].label);
  }

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