javascript:(async()=>{
  const sel=document.getElementById('selectPaymentHistoryYearMonth');
  if(!sel){alert('selectPaymentHistoryYearMonth が見つかりません');return;}
  const urls=[...sel.options].map(o=>({label:o.text,url:o.value}));
  let total=0;
  const details=[];
  const overlay=document.createElement('div');
  overlay.style.cssText='position:fixed;top:10px;right:10px;z-index:99999;background:#fff;border:2px solid #333;padding:12px 16px;font:14px sans-serif;width:280px;max-height:80vh;overflow-y:auto;box-shadow:0 4px 12px rgba(0,0,0,.3);border-radius:6px;';
  overlay.innerHTML='<b>BOOKWALKER 合計計算中...</b><div id="_bw_progress"></div>';
  document.body.appendChild(overlay);
  const prog=document.getElementById('_bw_progress');
  for(let i=0;i<urls.length;i++){
    const {label,url}=urls[i];
    prog.textContent=`(${i+1}/${urls.length}) ${label} を取得中...`;
    try{
      const r=await fetch(url,{credentials:'include'});
      const t=await r.text();
      const m=t.match(/id="totalPurchasePrice"[^>]*>([^<]*)/);
      if(m){
        const val=parseInt(m[1].replace(/,/g,''),10)||0;
        total+=val;
        if(val>0)details.push(`${label}: ¥${m[1]}`);
      }
    }catch(e){details.push(`${label}: エラー`);}
  }
  overlay.innerHTML=`
    <b style="font-size:16px">💰 BOOKWALKER 累計購入金額</b><hr>
    <div style="font-size:22px;color:#e44;font-weight:bold;margin:8px 0">¥${total.toLocaleString()} 円（税抜）</div>
    <div style="font-size:12px;color:#666">集計月数: ${urls.length}ヶ月（${urls[urls.length-1].label}〜${urls[0].label}）</div>
    <hr>
    <details><summary style="cursor:pointer;font-size:12px">月別内訳を表示</summary>
    <div style="font-size:11px;margin-top:6px">${details.join('<br>')}</div></details>
    <button onclick="this.closest('div').remove()" style="margin-top:10px;padding:4px 10px;cursor:pointer">閉じる</button>
  `;
})();