// Printable content height inside a page (A4 minus vertical padding)
  const PAGE_CONTENT = 1027;     // 1123 − 56 − 40
  const TITLE_SPACE  = 64;       // page-1 title block allowance

  let pageNum = 0, page = null, used = 0;
  let isFirstPage = true;
  
  // Pre-scan for the first PDF page number to start numbering correctly
  if (respectBreaks) {
    for (const b of blocks) {
      if (b.classList.contains('reh-block-pagebreak')) {
        const i = parseInt(b.dataset.index);
        const l = rehState.lines[i];
        if (l && l.page) {
          // If the pagebreak is for page N, the content before it is N or N-1 depending on how breaks are placed.
          // Usually a page break marker MEANS "Start of Page N".
          // If the first element is NOT a pagebreak, it means the content belongs to the page BEFORE the first pagebreak.
          // We'll just set pageNum to l.page - 1 (or 1 if it's 1).
          pageNum = Math.max(0, l.page - (b === blocks[0] ? 0 : 1));
        }
        break;
      }
    }
  }

  const newPage = (forcedNum) => {
    if (forcedNum !== undefined) pageNum = forcedNum;
    else pageNum++;
    page = document.createElement('div');
    page.className = 'reh-paper';
    const num = document.createElement('div');
    num.className = 'reh-paper-num';
    num.textContent = pageNum + '.';
    page.appendChild(num);
    used = 0;
    if (isFirstPage && titleEl) {
      const t = titleEl.cloneNode(true);
      t.style.display = '';
      page.appendChild(t);
      used += TITLE_SPACE;
    }
    isFirstPage = false;
    wrap.appendChild(page);
  };
  newPage();

  for (const block of blocks) {
    // PDF page-break marker: always start a new page here
    if (respectBreaks && block.classList.contains('reh-block-pagebreak')) {
      const i = parseInt(block.dataset.index);
      const l = rehState.lines[i];
      newPage(l && l.page ? l.page : undefined);
      continue; // don't move the marker div into the page
    }

    // Measure block height (must be in DOM to measure → append then check)
    page.appendChild(block);
    const cs = getComputedStyle(block);
    const h  = block.offsetHeight + (parseFloat(cs.marginTop) || 0) + (parseFloat(cs.marginBottom) || 0);

    // If adding this block overflows the page (and page already has content), move to a new page
    if (!respectBreaks && used + h > PAGE_CONTENT && used > (isFirstPage ? TITLE_SPACE : 0)) {
      newPage();
      page.appendChild(block);
    }
    used += h;
  }