fix: 译文iframe内嵌 + 无译文时弹提示

static/index.html

@@ -190,8 +190,7 @@ function renderPaper(p) {
   // Show translation button for ALL papers with arxiv or pdf
   const paperId = p.arxiv || (p.pdf ? p.pdf.split('/').pop().replace('.pdf','') : null);
   if (paperId) {
-    const transUrl = `/papers/translated/${paperId}.pdf`;
-    links.push(`<button class="paper-link trans-btn" data-pdf="${encodeURIComponent(transUrl)}" data-title="${encodeURIComponent(p.title + ' [中文译文]')}" onclick="openPdfBtn(this)">📖 译文</button>`);
+    links.push('<button class="paper-link trans-btn" data-pdf="/papers/translated/' + paperId + '.pdf" data-title="' + p.title + ' [译文]" onclick="openTrans(this)">📖 译文</button>');
   }
   return `<div class="paper-item"><div class="paper-year">${p.year||'—'}</div><div class="paper-body" id="${id}">
     <div class="paper-title">${p.title}</div>
@@ -208,6 +207,15 @@ function getPdfLink(p) {
 
 function openPdfBtn(btn) { openPdf(btn.dataset.pdf, btn.dataset.title); }
 
+async function openTrans(btn) {
+  const url = btn.dataset.pdf;
+  try {
+    const resp = await fetch(url, { method: 'HEAD' });
+    if (resp.ok) { openPdf(url, btn.dataset.title); return; }
+  } catch(e) {}
+  alert('该论文译文尚未生成，请稍后再试');
+}
+
 // ═══════════════ PDF VIEWER (状态条驱动) ═══════════════
 function getLocalPdfUrl(extUrl) {
   const am = extUrl.match(/arxiv\.org\/pdf\/(\d+\.\d+)/);