(async () => {
  const sleep = ms => new Promise(r => setTimeout(r, ms));
  const KEY = 'bm_removed_total_v3';
  let removed = +(sessionStorage.getItem(KEY) || 0);
  const before = removed;
  let idle = 0, skipped = 0;
  while (idle < 10) {
    const students = [...document.querySelectorAll('button[data-testid="removeBookmark"]')];
    const btn = students.find(b => {
      const row = b.closest('article, [data-testid="cellInnerDiv"]');
      return row && !row.dataset.bmSkip;
    });
    if (!btn) {
      if (students.length > 0) break;            // 剩下的都是失败跳过项
      idle++;
      const el = document.scrollingElement;
      el.scrollTop = el.scrollHeight;
      await sleep(2500);
      continue;
    }
    idle = 0;
    const row = btn.closest('article, [data-testid="cellInnerDiv"]');
    btn.click();
    let ok = false;
    for (let i = 0; i < 12 && !ok; i++) {        // 最多等 3 秒确认状态变化
      await sleep(250);
      ok = !document.contains(row)
        || !row.querySelector('button[data-testid="removeBookmark"]');
    }
    if (ok) {
      removed++;
      sessionStorage.setItem(KEY, removed);
      if (removed % 10 === 0) console.log('累计已取消 ' + removed + ' 条');
    } else {
      row.dataset.bmSkip = '1';
      skipped++;
      console.warn('有一条取消后状态没变，已标记跳过（可能是限流），稍后可重跑');
    }
  }
  console.log('本轮取消 ' + (removed - before) + ' 条，累计 ' + removed + ' 条，失败跳过 ' + skipped + ' 条');
  console.log('请刷新页面确认；如果还有书签，再跑一遍即可');
})();