feat: odd/even variants for footer/header

CHANGELOG.md

@@ -54,7 +54,7 @@
 - Page margins (cm) and page orientation (portrait / landscape)
 - Page format picker (Layout panel): 15 Word/LibreOffice sizes — A3–A6, ISO B4–B6, JIS B4/B5, Letter, Legal, Tabloid, Executive, Folio, Statement — each showing its cm dimensions; drives the on-screen page, pagination, and ODT/DOCX/PDF export, and is detected & adopted on import
 - Multi-column (newspaper) layout: 1–3 columns with adjustable gap, applied to the whole document (no selection) or to selected paragraphs, Word-style — text fills column 1 to the page bottom, then column 2, and flows across pages with mid-paragraph line breaks; a section followed by other content balances its columns. Round-trips to ODF `text:section`/`style:columns` and DOCX continuous sections with `w:cols`
-- Headers & footers with page-number / page-count fields and configurable edge distances
+- Headers & footers: page-number / page-count fields, configurable edge distances, and Word-style variants — different first page and different odd & even pages (edit a page's zone directly; blank first/even zones supported). Press Enter to add blank lines that grow a zone into the page while body text reflows so the page break sits above the footer / below the header, never overlapping. Inline images/logos can be inserted in a zone. Round-trips to ODF (`style:header-first`/`-left`, `draw:frame`) and DOCX (`w:titlePg`/`w:evenAndOddHeaders`, `ImageRun`)
 - Zoom (20–300 %)
 - Show formatting marks (spaces, tabs, paragraph marks)
 

src/App.svelte

@@ -21,7 +21,7 @@
   import { loadPageMargins, savePageMargins, DEFAULT_MARGINS, type PageMargins } from './lib/storage/pageMargins';
   import { loadOrientation, saveOrientation, type Orientation } from './lib/storage/pageOrientation';
   import { loadPageFormat, savePageFormat, type PageFormat } from './lib/storage/pageFormat';
-  import { loadHfDoc, saveHfDoc, loadHfDistances, saveHfDistances, loadDifferentFirstPage, saveDifferentFirstPage, hfIsEmpty, DEFAULT_HF_DISTANCES, type HfDoc, type HfZone, type HfDistances } from './lib/storage/headerFooter';
+  import { loadHfDoc, saveHfDoc, loadHfDistances, saveHfDistances, loadDifferentFirstPage, saveDifferentFirstPage, loadDifferentOddEven, saveDifferentOddEven, hfIsEmpty, DEFAULT_HF_DISTANCES, type HfDoc, type HfZone, type HfDistances } from './lib/storage/headerFooter';
   import { loadDocName, saveDocName, stripOdtExtension, sanitizeNameForFile } from './lib/storage/documentName';
   import { loadDocumentLanguage, saveDocumentLanguage, odfFromLanguage, type DocumentLanguage } from './lib/storage/documentLanguage';
   import { spellController } from './lib/spell/controller';
@@ -49,6 +49,10 @@
   let headerFirstDoc: HfDoc = $state(loadHfDoc('header', 'first'));
   let footerFirstDoc: HfDoc = $state(loadHfDoc('footer', 'first'));
   let differentFirstPage: boolean = $state(loadDifferentFirstPage());
+  // Even-page header/footer (Word "Different Odd & Even Pages"), shown on even pages when on.
+  let headerEvenDoc: HfDoc = $state(loadHfDoc('header', 'even'));
+  let footerEvenDoc: HfDoc = $state(loadHfDoc('footer', 'even'));
+  let differentOddEven: boolean = $state(loadDifferentOddEven());
   let hfDistances: HfDistances = $state(loadHfDistances());
   let hfEditor: Editor | null = $state(null);
   let hfActive: HfZone | null = $state(null);
@@ -167,6 +171,19 @@
     saveHfDoc('footer', footerFirstDoc, 'first');
   });
 
+  $effect(() => {
+    saveHfDoc('header', headerEvenDoc, 'even');
+  });
+
+  $effect(() => {
+    saveHfDoc('footer', footerEvenDoc, 'even');
+  });
+
+  $effect(() => {
+    saveDifferentOddEven(differentOddEven);
+    hfActive = null;
+  });
+
   // Persist the flag and end any active header/footer edit when it flips (the live
   // editor is bound to one variant for its lifetime).
   $effect(() => {
@@ -325,6 +342,7 @@
     return {
       header: headerDoc, footer: footerDoc,
       headerFirst: headerFirstDoc, footerFirst: footerFirstDoc, differentFirstPage,
+      headerEven: headerEvenDoc, footerEven: footerEvenDoc, differentOddEven,
       pageCount: numPages,
       headerDistanceCm: hfDistances.header, footerDistanceCm: hfDistances.footer,
     };
@@ -333,7 +351,7 @@
   function isDocNonEmpty(): boolean {
     if (!editor) return false;
     const body = editor.state.doc.textContent.length > 0 || editor.state.doc.childCount > 1;
-    return body || !hfIsEmpty(headerDoc) || !hfIsEmpty(footerDoc) || !hfIsEmpty(headerFirstDoc) || !hfIsEmpty(footerFirstDoc);
+    return body || !hfIsEmpty(headerDoc) || !hfIsEmpty(footerDoc) || !hfIsEmpty(headerFirstDoc) || !hfIsEmpty(footerFirstDoc) || !hfIsEmpty(headerEvenDoc) || !hfIsEmpty(footerEvenDoc);
   }
 
   function handleNew() {
@@ -347,6 +365,9 @@
     headerFirstDoc = null;
     footerFirstDoc = null;
     differentFirstPage = false;
+    headerEvenDoc = null;
+    footerEvenDoc = null;
+    differentOddEven = false;
     pageMargins = { ...DEFAULT_MARGINS };
     pageOrientation = 'portrait';
     pageFormat = 'A4';
@@ -412,6 +433,9 @@
       headerFirstDoc = result.headerFirst;
       footerFirstDoc = result.footerFirst;
       differentFirstPage = result.differentFirstPage;
+      headerEvenDoc = result.headerEven;
+      footerEvenDoc = result.footerEven;
+      differentOddEven = result.differentOddEven;
       hfDistances = {
         header: result.headerDistanceCm ?? DEFAULT_HF_DISTANCES.header,
         footer: result.footerDistanceCm ?? DEFAULT_HF_DISTANCES.footer,
@@ -426,6 +450,8 @@
       collectFontFamilies(result.footer, fontSet);
       collectFontFamilies(result.headerFirst, fontSet);
       collectFontFamilies(result.footerFirst, fontSet);
+      collectFontFamilies(result.headerEven, fontSet);
+      collectFontFamilies(result.footerEven, fontSet);
       const missingFonts = await unavailableFonts(fontSet);
 
       const warnings = result.warnings.map(localizeImportMessage);
@@ -582,6 +608,9 @@
         headerFirstDoc,
         footerFirstDoc,
         differentFirstPage,
+        headerEvenDoc,
+        footerEvenDoc,
+        differentOddEven,
       });
     } catch (err) {
       console.error('[pdf] Print failed:', err);
@@ -892,6 +921,7 @@
           bind:pageFormat
           bind:hfDistances
           bind:differentFirstPage
+          bind:differentOddEven
           hfActive={hfActive}
           onEditZone={(zone) => (hfActive = zone)}
           onDebugDump={handleDebugDump}
@@ -913,6 +943,9 @@
     bind:headerFirstDoc
     bind:footerFirstDoc
     {differentFirstPage}
+    bind:headerEvenDoc
+    bind:footerEvenDoc
+    {differentOddEven}
     bind:hfEditor
     bind:hfActive
     bind:hfTick

src/lib/components/Editor.svelte

@@ -35,12 +35,14 @@
     pageFormat = 'A4',
     headerDoc = $bindable(null), footerDoc = $bindable(null), hfDistances = DEFAULT_HF_DISTANCES,
     headerFirstDoc = $bindable(null), footerFirstDoc = $bindable(null), differentFirstPage = false,
+    headerEvenDoc = $bindable(null), footerEvenDoc = $bindable(null), differentOddEven = false,
     hfEditor = $bindable(null), hfActive = $bindable(null), hfTick = $bindable(0),
   }: {
     editor: Editor | null; tick: number; currentPage: number; numPages: number; zoom: number;
     showFormattingMarks?: boolean; pageMargins?: PageMargins; orientation?: Orientation; pageFormat?: PageFormat;
     headerDoc?: HfDoc; footerDoc?: HfDoc; hfDistances?: HfDistances;
     headerFirstDoc?: HfDoc; footerFirstDoc?: HfDoc; differentFirstPage?: boolean;
+    headerEvenDoc?: HfDoc; footerEvenDoc?: HfDoc; differentOddEven?: boolean;
     hfEditor?: Editor | null; hfActive?: HfZone | null; hfTick?: number;
   } = $props();
 
@@ -70,9 +72,13 @@
   // Effective top/bottom margins (px) for other pages vs. page 1's own header/footer
   // (different first page); pageBreaks reads these to start each page's content below
   // its header and end it above its footer.
-  let effTopRest = $derived(Math.max(mTopPx, hfReachPx(headerDoc ?? null, headerDistPx)));
+  // "rest" = every page ≥ 2; fold the even variant in (max) so even pages never overlap
+  // a taller even zone — pageBreaks uses one --pb-content-*-rest for all of them.
+  let evenTopReach = $derived(differentOddEven ? hfReachPx(headerEvenDoc ?? null, headerDistPx) : 0);
+  let evenBottomReach = $derived(differentOddEven ? hfReachPx(footerEvenDoc ?? null, footerDistPx) : 0);
+  let effTopRest = $derived(Math.max(mTopPx, hfReachPx(headerDoc ?? null, headerDistPx), evenTopReach));
   let effTopFirst = $derived(Math.max(mTopPx, hfReachPx((differentFirstPage ? headerFirstDoc : headerDoc) ?? null, headerDistPx)));
-  let effBottomRest = $derived(Math.max(mBottomPx, hfReachPx(footerDoc ?? null, footerDistPx)));
+  let effBottomRest = $derived(Math.max(mBottomPx, hfReachPx(footerDoc ?? null, footerDistPx), evenBottomReach));
   let effBottomFirst = $derived(Math.max(mBottomPx, hfReachPx((differentFirstPage ? footerFirstDoc : footerDoc) ?? null, footerDistPx)));
   $effect(() => {
     const s = document.documentElement.style;
@@ -733,6 +739,9 @@
         bind:headerFirstDoc
         bind:footerFirstDoc
         {differentFirstPage}
+        bind:headerEvenDoc
+        bind:footerEvenDoc
+        {differentOddEven}
         bind:hfEditor
         bind:hfActive
         bind:hfTick

src/lib/components/HeaderFooterLayer.svelte

@@ -1,7 +1,7 @@
 <script lang="ts">
   import { Editor, generateHTML, type Content } from '@tiptap/core';
   import { hfExtensions } from '../editor/extensions/headerFooter';
-  import { hfIsEmpty, DEFAULT_HF_DISTANCES, type HfDoc, type HfZone, type HfDistances } from '../storage/headerFooter';
+  import { hfIsEmpty, DEFAULT_HF_DISTANCES, type HfDoc, type HfZone, type HfVariant, type HfDistances } from '../storage/headerFooter';
   import { cmToPx, PX_PER_CM, type PageMargins } from '../storage/pageMargins';
   import { type Orientation } from '../storage/pageOrientation';
   import { pageDimsCm, type PageFormat } from '../storage/pageFormat';
@@ -13,6 +13,9 @@
     headerFirstDoc = $bindable(),
     footerFirstDoc = $bindable(),
     differentFirstPage = false,
+    headerEvenDoc = $bindable(),
+    footerEvenDoc = $bindable(),
+    differentOddEven = false,
     numPages,
     currentPage,
     pageMargins,
@@ -28,6 +31,9 @@
     headerFirstDoc: HfDoc;
     footerFirstDoc: HfDoc;
     differentFirstPage?: boolean;
+    headerEvenDoc: HfDoc;
+    footerEvenDoc: HfDoc;
+    differentOddEven?: boolean;
     numPages: number;
     currentPage: number;
     pageMargins: PageMargins;
@@ -107,13 +113,21 @@
   let footerHtml = $derived(staticHtml(footerDoc));
   let headerFirstHtml = $derived(staticHtml(headerFirstDoc));
   let footerFirstHtml = $derived(staticHtml(footerFirstDoc));
+  let headerEvenHtml = $derived(staticHtml(headerEvenDoc));
+  let footerEvenHtml = $derived(staticHtml(footerEvenDoc));
 
-  // Page 1 uses the first-page variant when the feature is on. Word: the first page
-  // then always shows its own (possibly empty) zone, never the default.
-  let isFirstVariant = (page: number) => differentFirstPage && page === 1;
+  // Which variant a page shows (Word precedence): page 1 → first (if on), other even
+  // pages → even (if on), everything else → default/odd. Each variant, when on, always
+  // shows its own (possibly empty) zone, never the default.
+  function variantFor(page: number): HfVariant {
+    if (differentFirstPage && page === 1) return 'first';
+    if (differentOddEven && page % 2 === 0) return 'even';
+    return 'default';
+  }
   function zoneHtml(zone: HfZone, page: number): string {
-    if (zone === 'header') return isFirstVariant(page) ? headerFirstHtml : headerHtml;
-    return isFirstVariant(page) ? footerFirstHtml : footerHtml;
+    const v = variantFor(page);
+    if (zone === 'header') return v === 'first' ? headerFirstHtml : v === 'even' ? headerEvenHtml : headerHtml;
+    return v === 'first' ? footerFirstHtml : v === 'even' ? footerEvenHtml : footerHtml;
   }
 
   // Replace the placeholder text in every page-field span with the real value:
@@ -138,9 +152,10 @@
   let pendingPage: number | null = null;
   let liveZone: HfZone | null = null;
 
-  // The doc for a zone + whether page 1's own variant is being edited.
-  function zoneDoc(zone: HfZone, first: boolean): HfDoc {
-    if (first) return zone === 'header' ? headerFirstDoc : footerFirstDoc;
+  // The doc for a zone + which variant is being edited.
+  function zoneDoc(zone: HfZone, variant: HfVariant): HfDoc {
+    if (variant === 'first') return zone === 'header' ? headerFirstDoc : footerFirstDoc;
+    if (variant === 'even') return zone === 'header' ? headerEvenDoc : footerEvenDoc;
     return zone === 'header' ? headerDoc : footerDoc;
   }
   function emptyDoc(): HfDoc {
@@ -174,13 +189,13 @@
     editingPage = pendingPage ?? currentPage;
     pendingPage = null;
     liveZone = zone;
-    // Which variant this edit session targets — fixed for its lifetime (page 1 with the
-    // feature on edits the first-page doc; App ends the edit when the flag toggles).
-    const editingFirst = isFirstVariant(editingPage);
+    // Which variant this edit session targets — fixed for its lifetime (the edited page's
+    // variant; App ends the edit when a flag toggles).
+    const editingVariant = variantFor(editingPage);
     const ed = new Editor({
       element: mount,
       extensions: hfExtensions(zone === 'header' ? t().hf.headerPlaceholder : t().hf.footerPlaceholder),
-      content: (zoneDoc(zone, editingFirst) ?? emptyDoc()) as Content,
+      content: (zoneDoc(zone, editingVariant) ?? emptyDoc()) as Content,
       // No autofocus: its scrollIntoView nudges the page so the just-clicked zone
       // appears to jump. Focus the zone explicitly without scrolling instead.
       onTransaction: () => {
@@ -188,9 +203,12 @@
       },
       onUpdate: ({ editor }) => {
         const json = editor.getJSON() as HfDoc;
-        if (editingFirst) {
+        if (editingVariant === 'first') {
           if (zone === 'header') headerFirstDoc = json;
           else footerFirstDoc = json;
+        } else if (editingVariant === 'even') {
+          if (zone === 'header') headerEvenDoc = json;
+          else footerEvenDoc = json;
         } else if (zone === 'header') headerDoc = json;
         else footerDoc = json;
       },
@@ -256,12 +274,12 @@
 
   {#if hfActive}
     {@const box = activeZoneBox(hfActive, editingPage)}
-    {@const first = isFirstVariant(editingPage)}
+    {@const variant = variantFor(editingPage)}
     <div class="hf-zone hf-{hfActive} hf-active" style={boxStyle(box) + ` --hf-tb-offset: ${-activeTrailingPx}px;`} bind:this={liveMount}></div>
     <div class="hf-tag" style="top: {box.top}px; left: {box.left}px;">
       {hfActive === 'header'
-        ? (first ? t().hf.firstPageHeader : t().hf.headerLabel)
-        : (first ? t().hf.firstPageFooter : t().hf.footerLabel)}
+        ? (variant === 'first' ? t().hf.firstPageHeader : variant === 'even' ? t().hf.evenPageHeader : t().hf.headerLabel)
+        : (variant === 'first' ? t().hf.firstPageFooter : variant === 'even' ? t().hf.evenPageFooter : t().hf.footerLabel)}
     </div>
     <div class="hf-bar" style="top: {box.top}px; left: {box.left + box.width}px;">
       <span class="hf-bar-label">{t().hf.insert}</span>

src/lib/components/ToolbarExpanded.svelte

@@ -22,8 +22,8 @@
   import { t } from '../i18n/i18n.svelte';
   import { withShortcut } from '../i18n/shortcut';
 
-  let { editor, tick, showFormattingMarks = $bindable(), pageMargins = $bindable(DEFAULT_MARGINS), pageOrientation = $bindable<Orientation>('portrait'), pageFormat = $bindable<PageFormat>('A4'), hfDistances = $bindable(DEFAULT_HF_DISTANCES), differentFirstPage = $bindable(false), hfActive = null, onEditZone, onDebugDump }:
-    { editor: Editor | null; tick: number; showFormattingMarks: boolean; pageMargins?: PageMargins; pageOrientation?: Orientation; pageFormat?: PageFormat; hfDistances?: HfDistances; differentFirstPage?: boolean; hfActive?: 'header' | 'footer' | null; onEditZone?: (zone: 'header' | 'footer') => void; onDebugDump?: () => void } = $props();
+  let { editor, tick, showFormattingMarks = $bindable(), pageMargins = $bindable(DEFAULT_MARGINS), pageOrientation = $bindable<Orientation>('portrait'), pageFormat = $bindable<PageFormat>('A4'), hfDistances = $bindable(DEFAULT_HF_DISTANCES), differentFirstPage = $bindable(false), differentOddEven = $bindable(false), hfActive = null, onEditZone, onDebugDump }:
+    { editor: Editor | null; tick: number; showFormattingMarks: boolean; pageMargins?: PageMargins; pageOrientation?: Orientation; pageFormat?: PageFormat; hfDistances?: HfDistances; differentFirstPage?: boolean; differentOddEven?: boolean; hfActive?: 'header' | 'footer' | null; onEditZone?: (zone: 'header' | 'footer') => void; onDebugDump?: () => void } = $props();
 
   const PAGE_FORMATS = Object.keys(PAGE_FORMAT_CM) as PageFormat[];
 
@@ -1274,6 +1274,10 @@
             <input type="checkbox" bind:checked={differentFirstPage} />
             <span>{t().toolbarExpanded.differentFirstPage}</span>
           </label>
+          <label class="hf-firstpage-row" title={t().toolbarExpanded.differentOddEvenHint}>
+            <input type="checkbox" bind:checked={differentOddEven} />
+            <span>{t().toolbarExpanded.differentOddEven}</span>
+          </label>
 
           <div class="lh-section-label">{t().toolbarExpanded.position}</div>
           <div class="margin-grid">

src/lib/export/docx.ts

@@ -856,6 +856,10 @@ export async function buildDocx(
   const differentFirstPage = !!hf?.differentFirstPage;
   const firstHeaderPara = differentFirstPage && !hfIsEmpty(hf?.headerFirst ?? null) ? (hf!.headerFirst!.content![0] as TiptapNode) : null;
   const firstFooterPara = differentFirstPage && !hfIsEmpty(hf?.footerFirst ?? null) ? (hf!.footerFirst!.content![0] as TiptapNode) : null;
+  // Different odd & even pages (Word w:evenAndOddHeaders): even pages get their own zone.
+  const differentOddEven = !!hf?.differentOddEven;
+  const evenHeaderPara = differentOddEven && !hfIsEmpty(hf?.headerEven ?? null) ? (hf!.headerEven!.content![0] as TiptapNode) : null;
+  const evenFooterPara = differentOddEven && !hfIsEmpty(hf?.footerEven ?? null) ? (hf!.footerEven!.content![0] as TiptapNode) : null;
   // Word's model: header/footer distance is from the page edge; the body still starts
   // at the body margin. Clamp the distance below the margin (matches odt.ts).
   const headerDist = Math.min(hf?.headerDistanceCm ?? HF_DISTANCE_CM, margins.top);
@@ -875,23 +879,26 @@ export async function buildDocx(
   // Fresh instances per section (Word's per-sectPr references). A first-page variant
   // rides `first:` and is activated by properties.titlePage below.
   const mkHeaders = () => {
-    if (!headerPara && !firstHeaderPara) return undefined;
-    const h: { default?: Header; first?: Header } = {};
+    if (!headerPara && !firstHeaderPara && !evenHeaderPara) return undefined;
+    const h: { default?: Header; first?: Header; even?: Header } = {};
     if (headerPara) h.default = new Header({ children: [paragraphToDocx(headerPara)] });
     if (firstHeaderPara) h.first = new Header({ children: [paragraphToDocx(firstHeaderPara)] });
+    if (evenHeaderPara) h.even = new Header({ children: [paragraphToDocx(evenHeaderPara)] });
     return h;
   };
   const mkFooters = () => {
-    if (!footerPara && !firstFooterPara) return undefined;
-    const f: { default?: Footer; first?: Footer } = {};
+    if (!footerPara && !firstFooterPara && !evenFooterPara) return undefined;
+    const f: { default?: Footer; first?: Footer; even?: Footer } = {};
     if (footerPara) f.default = new Footer({ children: [paragraphToDocx(footerPara)] });
     if (firstFooterPara) f.first = new Footer({ children: [paragraphToDocx(firstFooterPara)] });
+    if (evenFooterPara) f.even = new Footer({ children: [paragraphToDocx(evenFooterPara)] });
     return f;
   };
 
   const doc = new Document({
     creator: 'Web ODF Editor',
     defaultTabStop: cmToTwip(1.25),
+    ...(differentOddEven ? { evenAndOddHeaderAndFooters: true } : {}),
     ...(hasToc ? { features: { updateFields: true } } : {}),
     styles: buildStyles(language),
     numbering: { config: num.config },

src/lib/export/odt.ts

@@ -2078,6 +2078,11 @@ export type HfExport = {
   headerFirst?: HfDoc;
   footerFirst?: HfDoc;
   differentFirstPage?: boolean;
+  // Even-page overrides (Word evenAndOddHeaders / ODF header-left); only used when
+  // differentOddEven is set. null = the even pages' zone is blank.
+  headerEven?: HfDoc;
+  footerEven?: HfDoc;
+  differentOddEven?: boolean;
   pageCount: number;
   headerDistanceCm?: number;
   footerDistanceCm?: number;
@@ -2102,6 +2107,10 @@ export async function buildOdt(docJson: TiptapNode, margins: PageMargins = DEFAU
   const differentFirstPage = !!hf?.differentFirstPage;
   let firstHeaderPara = differentFirstPage && hf && !hfIsEmpty(hf.headerFirst ?? null) ? (hf.headerFirst!.content![0] as TiptapNode) : null;
   let firstFooterPara = differentFirstPage && hf && !hfIsEmpty(hf.footerFirst ?? null) ? (hf.footerFirst!.content![0] as TiptapNode) : null;
+  // Different odd & even pages (ODF header-left): even pages get their own zone.
+  const differentOddEven = !!hf?.differentOddEven;
+  let evenHeaderPara = differentOddEven && hf && !hfIsEmpty(hf.headerEven ?? null) ? (hf.headerEven!.content![0] as TiptapNode) : null;
+  let evenFooterPara = differentOddEven && hf && !hfIsEmpty(hf.footerEven ?? null) ? (hf.footerEven!.content![0] as TiptapNode) : null;
   // Hoist header/footer inline images out to HFIMG sentinels before odf-kit serializes
   // the zones; applyHfPostProcess rewrites them to <draw:frame> in styles.xml.
   const hfImages: ImageExport[] = [];
@@ -2109,6 +2118,8 @@ export async function buildOdt(docJson: TiptapNode, margins: PageMargins = DEFAU
   footerPara = replaceHfImages(footerPara, hfImages);
   firstHeaderPara = replaceHfImages(firstHeaderPara, hfImages);
   firstFooterPara = replaceHfImages(firstFooterPara, hfImages);
+  evenHeaderPara = replaceHfImages(evenHeaderPara, hfImages);
+  evenFooterPara = replaceHfImages(evenFooterPara, hfImages);
   // With the flag on, page 1 is independent: whenever a side has a zone on either
   // variant, emit both (an empty one blanks its side, matching the editor and Word).
   if (differentFirstPage) {
@@ -2116,6 +2127,12 @@ export async function buildOdt(docJson: TiptapNode, margins: PageMargins = DEFAU
     if (headerPara || firstHeaderPara) { headerPara ??= empty(); firstHeaderPara ??= empty(); }
     if (footerPara || firstFooterPara) { footerPara ??= empty(); firstFooterPara ??= empty(); }
   }
+  // Same for even pages: an empty even zone blanks it while the default fills odd pages.
+  if (differentOddEven) {
+    const empty = (): TiptapNode => ({ type: 'paragraph', content: [] });
+    if (headerPara || evenHeaderPara) { headerPara ??= empty(); evenHeaderPara ??= empty(); }
+    if (footerPara || evenFooterPara) { footerPara ??= empty(); evenFooterPara ??= empty(); }
+  }
   // Distance from the page edge to the header (top) / footer (bottom). Becomes the
   // ODF page margin; clamped below the body margin so the body still starts at it.
   const headerDist = Math.min(hf?.headerDistanceCm ?? HF_DISTANCE_CM, margins.top);
@@ -2248,7 +2265,7 @@ export async function buildOdt(docJson: TiptapNode, margins: PageMargins = DEFAU
   const withPageBreaks = applyPageBreaks(withToc);
   const withEmptyFontSizes = applyEmptyLineFontSizes(withPageBreaks);
   const withStyles = rewriteStylesXml(withEmptyFontSizes, language ?? null, pageFormat, orientation);
-  return applyHfPostProcess(withStyles, margins, headerPara, footerPara, headerDist, footerDist, firstHeaderPara, firstFooterPara, hf?.pageCount ?? 1, hfImages);
+  return applyHfPostProcess(withStyles, margins, headerPara, footerPara, headerDist, footerDist, firstHeaderPara, firstFooterPara, hf?.pageCount ?? 1, hfImages, evenHeaderPara, evenFooterPara);
 }
 
 function hfAlign(para: TiptapNode): AlignValue | null {
@@ -2259,8 +2276,8 @@ function hfAlign(para: TiptapNode): AlignValue | null {
 // Header/footer post-processing on styles.xml: resolve LBR/PGC sentinels, apply the
 // paragraph alignment to the Header/Footer styles, and rewrite the geometry to the
 // Word-style mapping (page margin = HF distance, min-height fills up to the body margin).
-function applyHfPostProcess(odtBytes: Uint8Array, margins: PageMargins, headerPara: TiptapNode | null, footerPara: TiptapNode | null, headerDist: number, footerDist: number, firstHeaderPara: TiptapNode | null = null, firstFooterPara: TiptapNode | null = null, pageCount = 1, hfImages: ImageExport[] = []): Uint8Array {
-  if (!headerPara && !footerPara && !firstHeaderPara && !firstFooterPara) return odtBytes;
+function applyHfPostProcess(odtBytes: Uint8Array, margins: PageMargins, headerPara: TiptapNode | null, footerPara: TiptapNode | null, headerDist: number, footerDist: number, firstHeaderPara: TiptapNode | null = null, firstFooterPara: TiptapNode | null = null, pageCount = 1, hfImages: ImageExport[] = [], evenHeaderPara: TiptapNode | null = null, evenFooterPara: TiptapNode | null = null): Uint8Array {
+  if (!headerPara && !footerPara && !firstHeaderPara && !firstFooterPara && !evenHeaderPara && !evenFooterPara) return odtBytes;
 
   const files = unzipSync(odtBytes);
   const stylesBytes = files['styles.xml'];
@@ -2296,24 +2313,26 @@ function applyHfPostProcess(odtBytes: Uint8Array, margins: PageMargins, headerPa
   if (headerPara) zone('header', headerPara, margins.top, headerDist);
   if (footerPara) zone('footer', footerPara, margins.bottom, footerDist);
 
-  // Different first page: inject <style:header-first>/<style:footer-first> content into
-  // the master page (ODF 1.3; LibreOffice reads them). The page-layout header/footer
+  // Different first page / odd-even: inject <style:{header,footer}-{first,left}> content
+  // into the master page (ODF 1.3; LibreOffice reads them). The page-layout header/footer
   // geometry above is shared across variants, so only the content differs here.
-  if (firstHeaderPara || firstFooterPara) {
+  if (firstHeaderPara || firstFooterPara || evenHeaderPara || evenFooterPara) {
     const mintedStyles: string[] = [];
     const mint = (n: string) => { mintedStyles.push(n); };
-    const injectVariant = (kind: 'header' | 'footer', para: TiptapNode | null) => {
+    const injectVariant = (kind: 'header' | 'footer', suffix: 'first' | 'left', para: TiptapNode | null) => {
       if (!para) return;
-      const xml = hfFirstZoneXml(kind, para, pageCount, mint);
-      // Order inside master-page: header, header-first, footer, footer-first. Insert
-      // after the matching default zone if present, else at the master-page bounds.
+      const xml = hfVariantZoneXml(kind, suffix, para, pageCount, mint);
+      // Insert after the matching default zone (always present when a variant exists,
+      // since buildOdt emits an empty default alongside it), else at the master-page bounds.
       const closeTag = `</style:${kind}>`;
       if (styles.includes(closeTag)) styles = styles.replace(closeTag, `${closeTag}${xml}`);
       else if (kind === 'header') styles = styles.replace(/(<style:master-page\b[^>]*>)/, `$1${xml}`);
       else styles = styles.replace('</style:master-page>', `${xml}</style:master-page>`);
     };
-    injectVariant('header', firstHeaderPara);
-    injectVariant('footer', firstFooterPara);
+    injectVariant('header', 'first', firstHeaderPara);
+    injectVariant('header', 'left', evenHeaderPara);
+    injectVariant('footer', 'first', firstFooterPara);
+    injectVariant('footer', 'left', evenFooterPara);
     if (mintedStyles.length) {
       const defs = mintedStyles.join('');
       if (styles.includes('</office:automatic-styles>')) styles = styles.replace('</office:automatic-styles>', `${defs}</office:automatic-styles>`);
@@ -2355,16 +2374,18 @@ function ensureDrawNamespaces(styles: string): string {
   return missing.length ? styles.replace(/<office:document-styles\b/, `<office:document-styles ${missing.join(' ')}`) : styles;
 }
 
-// Serialize a first-page header/footer paragraph to <style:header-first>/<style:footer-first>
-// XML. Runs and page fields become <text:span> referencing minted automatic text styles
-// (pushed via `mint`), so both keep the run's font; hardBreak → line-break.
-function hfFirstZoneXml(kind: 'header' | 'footer', para: TiptapNode, pageCount: number, mint: (styleXml: string) => void): string {
+// Serialize a variant header/footer paragraph to <style:{header,footer}-{first,left}>
+// XML (first = page 1, left = even pages). Runs and page fields become <text:span>
+// referencing minted automatic text styles (pushed via `mint`); hardBreak → line-break.
+function hfVariantZoneXml(kind: 'header' | 'footer', suffix: 'first' | 'left', para: TiptapNode, pageCount: number, mint: (styleXml: string) => void): string {
   let styleSeq = 0;
+  // Distinct minted-style prefix per variant so first + even styles never collide.
+  const pfx = `HF${suffix === 'first' ? 'F' : 'L'}${kind[0].toUpperCase()}`;
   // Wrap inline XML in a minted text style span when the run carries formatting.
   const styled = (innerXml: string, marks: TiptapNode['marks']): string => {
     const props = odfTextPropsFromMarks(marks);
     if (!props) return innerXml;
-    const name = `HFF${kind[0].toUpperCase()}T${++styleSeq}`;
+    const name = `${pfx}T${++styleSeq}`;
     mint(`<style:style style:name="${name}" style:family="text"><style:text-properties ${props}/></style:style>`);
     return `<text:span text:style-name="${name}">${innerXml}</text:span>`;
   };
@@ -2381,10 +2402,10 @@ function hfFirstZoneXml(kind: 'header' | 'footer', para: TiptapNode, pageCount:
   const align = hfAlign(para);
   let paraStyle = parent;
   if (align) {
-    paraStyle = `HFF${kind[0].toUpperCase()}P`;
+    paraStyle = `${pfx}P`;
     mint(`<style:style style:name="${paraStyle}" style:family="paragraph" style:parent-style-name="${parent}"><style:paragraph-properties fo:text-align="${align}"/></style:style>`);
   }
-  return `<style:${kind}-first><text:p text:style-name="${paraStyle}">${inner}</text:p></style:${kind}-first>`;
+  return `<style:${kind}-${suffix}><text:p text:style-name="${paraStyle}">${inner}</text:p></style:${kind}-${suffix}>`;
 }
 
 // A text run's ODF <style:text-properties> attribute string from TipTap marks (mirrors

src/lib/export/pdf.ts

@@ -359,6 +359,11 @@ export interface PrintPdfOptions {
   headerFirstDoc?: HfDoc;
   footerFirstDoc?: HfDoc;
   differentFirstPage?: boolean;
+  // Even-page overrides (Word "Different Odd & Even Pages"); rendered via @page :left
+  // (in an LTR document left pages are the even ones), which :first still overrides.
+  headerEvenDoc?: HfDoc;
+  footerEvenDoc?: HfDoc;
+  differentOddEven?: boolean;
 }
 
 // First-row column weights from table JSON (honours colspan); mirrors tableView.
@@ -465,6 +470,7 @@ function printCss(o: PrintPdfOptions): string {
   margin: ${m.top}cm ${m.right}cm ${m.bottom}cm ${m.left}cm;
   ${marginBoxes(o.headerDoc, o.footerDoc)}
 }
+${o.differentOddEven ? `@page :left {\n  ${marginBoxesFirst(o.headerEvenDoc ?? null, o.footerEvenDoc ?? null)}\n}` : ''}
 ${o.differentFirstPage ? `@page :first {\n  ${marginBoxesFirst(o.headerFirstDoc ?? null, o.footerFirstDoc ?? null)}\n}` : ''}
 html, body { margin: 0; padding: 0; background: #fff; }
 .paper { width: auto !important; transform: none !important; box-shadow: none !important; background: none !important; }
@@ -494,6 +500,9 @@ export function printPdf(opts: PrintPdfOptions): void {
     headerFirstDoc: opts.headerFirstDoc ?? null,
     footerFirstDoc: opts.footerFirstDoc ?? null,
     differentFirstPage: opts.differentFirstPage ?? false,
+    headerEvenDoc: opts.headerEvenDoc ?? null,
+    footerEvenDoc: opts.footerEvenDoc ?? null,
+    differentOddEven: opts.differentOddEven ?? false,
   };
   const title = (o.fileName ?? deriveFilename(o.json)).replace(/\.(odt|pdf)$/i, '');
   const body = buildBodyHtml(o.json);

src/lib/i18n/locales/de.ts

@@ -117,6 +117,8 @@ const de: Messages = {
     editFooter: 'Fußzeile bearbeiten',
     differentFirstPage: 'Erste Seite anders',
     differentFirstPageHint: 'Der ersten Seite eine eigene Kopf- und Fußzeile geben',
+    differentOddEven: 'Gerade & ungerade Seiten anders',
+    differentOddEvenHint: 'Geraden Seiten eine eigene Kopf- und Fußzeile geben',
     position: 'Position (cm)',
     hfDist: { header: 'Kopfzeile von oben', footer: 'Fußzeile von unten' },
     hfField: (label) => `${label} (cm)`,
@@ -289,6 +291,8 @@ const de: Messages = {
     footerLabel: 'Fußzeile',
     firstPageHeader: 'Kopfzeile erste Seite',
     firstPageFooter: 'Fußzeile erste Seite',
+    evenPageHeader: 'Kopfzeile gerade Seiten',
+    evenPageFooter: 'Fußzeile gerade Seiten',
     insert: 'Einfügen',
     pageNumber: 'Seitenzahl',
     pageNumberTitle: 'Aktuelle Seitenzahl einfügen',
@@ -354,7 +358,6 @@ const de: Messages = {
     imagesSkipped: 'Einige Bilder konnten nicht gelesen werden und wurden übersprungen',
     shapesRemoved: 'Nicht unterstützte Formen wurden entfernt',
     drawingsRemoved: 'Zeichnungen wurden entfernt',
-    perPageHf: 'Seitenabhängige Kopf-/Fußzeilen-Varianten (erste/gerade Seiten) werden nicht unterstützt — die Standardvariante wurde verwendet',
     noDictionary: (tag) => `Für die Rechtschreibsprache „${tag}" ist kein Wörterbuch enthalten — die Rechtschreibprüfung wurde deaktiviert`,
     hfFlattened: 'Listen/Tabellen in Kopf- oder Fußzeilen wurden in Text umgewandelt',
     textBoxFlattened: 'In Tabellenzellen oder anderen Textfeldern verschachtelte Textfelder wurden aufgelöst',

src/lib/i18n/locales/en.ts

@@ -120,6 +120,8 @@ const en = {
     editFooter: 'Edit footer',
     differentFirstPage: 'Different first page',
     differentFirstPageHint: 'Give the first page its own header and footer',
+    differentOddEven: 'Different odd & even pages',
+    differentOddEvenHint: 'Give even pages their own header and footer',
     position: 'Position (cm)',
     hfDist: { header: 'Header from top', footer: 'Footer from bottom' },
     hfField: (label: string) => `${label} (cm)`,
@@ -292,6 +294,8 @@ const en = {
     footerLabel: 'Footer',
     firstPageHeader: 'First page header',
     firstPageFooter: 'First page footer',
+    evenPageHeader: 'Even page header',
+    evenPageFooter: 'Even page footer',
     insert: 'Insert',
     pageNumber: 'Page number',
     pageNumberTitle: 'Insert the current page number',
@@ -359,7 +363,6 @@ const en = {
     imagesSkipped: 'Some images could not be read and were skipped',
     shapesRemoved: 'Unsupported shapes were removed',
     drawingsRemoved: 'Drawings were removed',
-    perPageHf: 'Per-page header/footer variants (first/even pages) are not supported — the default one was used',
     noDictionary: (tag: string) => `Spell-check language "${tag}" has no bundled dictionary — spell check was turned off`,
     hfFlattened: 'Lists/tables in headers or footers were flattened to text',
     textBoxFlattened: 'Text boxes nested in table cells or other text boxes were flattened',

src/lib/import/docx.ts

@@ -127,26 +127,29 @@ export function importDocx(bytes: Uint8Array, convertedImages: ConvertedImages =
   });
   if (blocks.length === 0) blocks.push({ type: 'paragraph' });
 
-  let sect = parseSectPr(finalSectPr, ctx);
+  // Odd/even pages: a document-level setting (settings.xml), not a section property.
+  const oddEven = docHasEvenOddHeaders(files);
+  let sect = parseSectPr(finalSectPr, ctx, oddEven);
   // Multi-section files may reference headers/footers only on an earlier section (page
   // geometry still comes from the body-final sectPr). Adopt its header/footer + first-
-  // page variants, keeping the different-first-page flag if either section set it.
-  if (!sect.header && !sect.footer && !sect.headerFirst && !sect.footerFirst) {
+  // page/even variants, keeping the different-first-page flag if either section set it.
+  if (!sect.header && !sect.footer && !sect.headerFirst && !sect.footerFirst && !sect.headerEven && !sect.footerEven) {
     const prev = [...midSectPrs].reverse().find((s) => fc(s, 'headerReference') || fc(s, 'footerReference'));
     if (prev) {
-      const prevSect = parseSectPr(prev, ctx);
+      const prevSect = parseSectPr(prev, ctx, oddEven);
       sect = {
         ...sect,
         header: prevSect.header, footer: prevSect.footer,
         headerFirst: prevSect.headerFirst, footerFirst: prevSect.footerFirst,
         differentFirstPage: sect.differentFirstPage || prevSect.differentFirstPage,
+        headerEven: prevSect.headerEven, footerEven: prevSect.footerEven,
         headerDistCm: prevSect.headerDistCm, footerDistCm: prevSect.footerDistCm,
       };
     }
   }
-  // A first-page zone reserves the header/footer band even when its default is empty.
-  const hasHeader = sect.header || (sect.differentFirstPage && sect.headerFirst);
-  const hasFooter = sect.footer || (sect.differentFirstPage && sect.footerFirst);
+  // A first-page/even zone reserves the header/footer band even when its default is empty.
+  const hasHeader = sect.header || (sect.differentFirstPage && sect.headerFirst) || (sect.differentOddEven && sect.headerEven);
+  const hasFooter = sect.footer || (sect.differentFirstPage && sect.footerFirst) || (sect.differentOddEven && sect.footerEven);
 
   return {
     content: { type: 'doc', content: blocks },
@@ -158,6 +161,9 @@ export function importDocx(bytes: Uint8Array, convertedImages: ConvertedImages =
     headerFirst: sect.differentFirstPage ? sect.headerFirst : null,
     footerFirst: sect.differentFirstPage ? sect.footerFirst : null,
     differentFirstPage: sect.differentFirstPage,
+    headerEven: sect.differentOddEven ? sect.headerEven : null,
+    footerEven: sect.differentOddEven ? sect.footerEven : null,
+    differentOddEven: sect.differentOddEven,
     headerDistanceCm: hasHeader ? sect.headerDistCm : null,
     footerDistanceCm: hasFooter ? sect.footerDistCm : null,
     language: documentLanguage(stylesDoc, warnings),
@@ -1147,12 +1153,24 @@ function pushColumnRuns(inner: Node[], cols: { count: number; gapCm: number }, o
   flush();
 }
 
-function parseSectPr(sect: Element | null, ctx: Ctx): {
+// Word's "Different Odd & Even Pages" toggle lives in settings.xml, not the sectPr.
+function docHasEvenOddHeaders(files: Record<string, Uint8Array>): boolean {
+  const bytes = files['word/settings.xml'];
+  if (!bytes) return false;
+  try {
+    return !!parseXml(strFromU8(bytes)).getElementsByTagNameNS(W, 'evenAndOddHeaders')[0];
+  } catch {
+    return false;
+  }
+}
+
+function parseSectPr(sect: Element | null, ctx: Ctx, oddEven = false): {
   margins: PageMargins | null; orientation: Orientation | null; format: PageFormat | null;
   header: HfDoc; footer: HfDoc; headerFirst: HfDoc; footerFirst: HfDoc; differentFirstPage: boolean;
+  headerEven: HfDoc; footerEven: HfDoc; differentOddEven: boolean;
   headerDistCm: number | null; footerDistCm: number | null;
 } {
-  const empty = { margins: null, orientation: null, format: null, header: null, footer: null, headerFirst: null, footerFirst: null, differentFirstPage: false, headerDistCm: null, footerDistCm: null };
+  const empty = { margins: null, orientation: null, format: null, header: null, footer: null, headerFirst: null, footerFirst: null, differentFirstPage: false, headerEven: null, footerEven: null, differentOddEven: false, headerDistCm: null, footerDistCm: null };
   if (!sect) return empty;
 
   const pgSz = fc(sect, 'pgSz');
@@ -1169,23 +1187,22 @@ function parseSectPr(sect: Element | null, ctx: Ctx): {
 
   // Different first page: w:titlePg turns on the "first"-type refs for page 1.
   const titlePg = !!fc(sect, 'titlePg');
-  const refId = (type: string, variant: 'default' | 'first' = 'default') => {
-    const want = variant === 'first' ? 'first' : 'default';
-    const ref = fcAll(sect, `${type}Reference`).find((r) => (r.getAttributeNS(W, 'type') ?? 'default') === want);
+  const refId = (type: string, variant: 'default' | 'first' | 'even' = 'default') => {
+    const ref = fcAll(sect, `${type}Reference`).find((r) => (r.getAttributeNS(W, 'type') ?? 'default') === variant);
     return ref?.getAttributeNS(R, 'id') ?? null;
   };
-  // The even/left variant stays unsupported (later pages fall back to the default).
-  if (fcAll(sect, 'headerReference').concat(fcAll(sect, 'footerReference')).some((r) => r.getAttributeNS(W, 'type') === 'even')) {
-    ctx.warnings.add('Per-page header/footer variants (first/even pages) are not supported — the default one was used');
-  }
 
   const header = convertHfPart(refId('header'), ctx);
   const footer = convertHfPart(refId('footer'), ctx);
   const headerFirst = titlePg ? convertHfPart(refId('header', 'first'), ctx) : null;
   const footerFirst = titlePg ? convertHfPart(refId('footer', 'first'), ctx) : null;
+  // Odd/even pages: settings.xml w:evenAndOddHeaders turns on the "even"-type refs.
+  const headerEven = oddEven ? convertHfPart(refId('header', 'even'), ctx) : null;
+  const footerEven = oddEven ? convertHfPart(refId('footer', 'even'), ctx) : null;
   return {
     margins, orientation, format, header, footer,
     headerFirst, footerFirst, differentFirstPage: titlePg,
+    headerEven, footerEven, differentOddEven: oddEven,
     headerDistCm: clampCm(intAttr(pgMar, W, 'header')),
     footerDistCm: clampCm(intAttr(pgMar, W, 'footer')),
   };

src/lib/import/odt.ts

@@ -39,6 +39,11 @@ export interface OdtImportResult {
   headerFirst: HfDoc;
   footerFirst: HfDoc;
   differentFirstPage: boolean;
+  // Even-page variants (Word "Different Odd & Even Pages" / ODF header-left). null when
+  // the file has no even-page override; only used when differentOddEven is set.
+  headerEven: HfDoc;
+  footerEven: HfDoc;
+  differentOddEven: boolean;
   // Edge→zone distance (cm): header from top, footer from bottom. null = no zone.
   headerDistanceCm: number | null;
   footerDistanceCm: number | null;
@@ -342,9 +347,6 @@ export function importOdt(bytes: Uint8Array, convertedImages: ConvertedImages =
   }
 
   const hf = resolver.masterPageHF();
-  if (hf.hasVariants) {
-    warnings.add('Per-page header/footer variants (first/even pages) are not supported — the default one was used');
-  }
 
   const geometry = resolver.pageGeometry();
   const edge = resolver.edgeDistancesCm();
@@ -373,9 +375,12 @@ export function importOdt(bytes: Uint8Array, convertedImages: ConvertedImages =
   // The presence of a first-page element is the flag, even when it's empty (an empty
   // first-page zone deliberately blanks page 1 while the default fills later pages).
   const differentFirstPage = !!(hf.headerFirst || hf.footerFirst);
-  // A first-page zone reserves the band even if its default counterpart is empty.
-  const hasHeader = hf.header || headerFirst;
-  const hasFooter = hf.footer || footerFirst;
+  const headerEven = hf.headerLeft ? convertHfZone(hf.headerLeft, ctx) : null;
+  const footerEven = hf.footerLeft ? convertHfZone(hf.footerLeft, ctx) : null;
+  const differentOddEven = !!(hf.headerLeft || hf.footerLeft);
+  // A first-page/even zone reserves the band even if its default counterpart is empty.
+  const hasHeader = hf.header || headerFirst || headerEven;
+  const hasFooter = hf.footer || footerFirst || footerEven;
 
   return {
     content: { type: 'doc', content: blocks },
@@ -387,6 +392,9 @@ export function importOdt(bytes: Uint8Array, convertedImages: ConvertedImages =
     headerFirst,
     footerFirst,
     differentFirstPage,
+    headerEven,
+    footerEven,
+    differentOddEven,
     headerDistanceCm: hasHeader ? edge?.top ?? null : null,
     footerDistanceCm: hasFooter ? edge?.bottom ?? null : null,
     language,

src/lib/import/styleResolver.ts

@@ -366,9 +366,10 @@ export class StyleResolver {
     footer: Element | null;
     headerFirst: Element | null;
     footerFirst: Element | null;
+    headerLeft: Element | null;
+    footerLeft: Element | null;
     headerExtraCm: number;
     footerExtraCm: number;
-    hasVariants: boolean;
   } {
     const mp = this.masterPageEl();
     const layout = this.pageLayoutEl();
@@ -411,10 +412,11 @@ export class StyleResolver {
       footer: zone('footer'),
       headerFirst: firstZone('header-first'),
       footerFirst: firstZone('footer-first'),
+      // Even-page variant (Word odd/even). ODF header-left = the left (even) page.
+      headerLeft: firstZone('header-left'),
+      footerLeft: firstZone('footer-left'),
       headerExtraCm: extraCm('header-style', 'margin-bottom'),
       footerExtraCm: extraCm('footer-style', 'margin-top'),
-      // Only the left/right (even) variant stays unsupported; -first is handled below.
-      hasVariants: ['header-left', 'footer-left'].some(l => zone(l) != null),
     };
   }
 

src/lib/storage/headerFooter.ts

@@ -1,18 +1,22 @@
 // Header/footer content: one single-paragraph TipTap doc per zone (hfExtensions
-// schema). The 'default' variant repeats on every page; the 'first' variant (Word
-// "Different First Page" / ODF header-first) overrides page 1. null = empty zone.
+// schema). The 'default' variant repeats on every page (odd pages when odd/even is
+// on); 'first' (Word "Different First Page" / ODF header-first) overrides page 1;
+// 'even' (Word "Different Odd & Even Pages" / ODF header-left) overrides even pages.
+// Precedence: first (page 1) > even (even pages) > default. null = empty zone.
 
 export type HfZone = 'header' | 'footer';
-export type HfVariant = 'default' | 'first';
+export type HfVariant = 'default' | 'first' | 'even';
 export type HfDoc = { type: 'doc'; content?: unknown[] } | null;
 
 const KEYS: Record<HfZone, Record<HfVariant, string>> = {
-  header: { default: 'odf-editor-header', first: 'odf-editor-header-first' },
-  footer: { default: 'odf-editor-footer', first: 'odf-editor-footer-first' },
+  header: { default: 'odf-editor-header', first: 'odf-editor-header-first', even: 'odf-editor-header-even' },
+  footer: { default: 'odf-editor-footer', first: 'odf-editor-footer-first', even: 'odf-editor-footer-even' },
 };
 
 // Whether page 1 uses its own header/footer (Word w:titlePg / ODF header-first).
 const DIFFERENT_FIRST_KEY = 'odf-editor-hf-different-first';
+// Whether even pages use their own header/footer (Word w:evenAndOddHeaders / ODF header-left).
+const DIFFERENT_ODD_EVEN_KEY = 'odf-editor-hf-odd-even';
 
 export function loadDifferentFirstPage(): boolean {
   return localStorage.getItem(DIFFERENT_FIRST_KEY) === 'true';
@@ -23,6 +27,15 @@ export function saveDifferentFirstPage(on: boolean): void {
   else localStorage.removeItem(DIFFERENT_FIRST_KEY);
 }
 
+export function loadDifferentOddEven(): boolean {
+  return localStorage.getItem(DIFFERENT_ODD_EVEN_KEY) === 'true';
+}
+
+export function saveDifferentOddEven(on: boolean): void {
+  if (on) localStorage.setItem(DIFFERENT_ODD_EVEN_KEY, 'true');
+  else localStorage.removeItem(DIFFERENT_ODD_EVEN_KEY);
+}
+
 // Word's default distance from the page edge to the header/footer text. The body
 // margin stays the body margin (Word semantics); export/import convert to ODF's
 // margin-to-header model (see export/odt.ts applyHfPostProcess).

tests/docx-roundtrip.test.ts

@@ -330,6 +330,26 @@ describe('DOCX different first page (w:titlePg)', () => {
     expect(Math.abs(fi[0].attrs.height - 48)).toBeLessThanOrEqual(2);
   });
 
+  it('round-trips odd/even page variants (w:evenAndOddHeaders + even refs)', async () => {
+    const withEven = {
+      ...hf,
+      headerEven: { type: 'doc', content: [para('Even header')] },
+      footerEven: { type: 'doc', content: [para('Even footer')] },
+      differentOddEven: true,
+    } as any;
+    const bytes = await buildDocx(fixture, undefined, 'portrait', withEven, { language: 'de', country: 'DE' });
+    const files = unzipSync(bytes);
+    expect(strFromU8(files['word/settings.xml'])).toContain('evenAndOddHeaders');
+    expect(strFromU8(files['word/document.xml'])).toMatch(/<w:headerReference[^>]*w:type="even"/);
+    const res = importDocx(bytes);
+    expect(res.differentOddEven).toBe(true);
+    expect(walk(res.headerEven, 'text')[0].text).toBe('Even header');
+    expect(walk(res.footerEven, 'text')[0].text).toBe('Even footer');
+    // default + first still intact.
+    expect(walk(res.header, 'text')[0].text).toBe('Default header');
+    expect(walk(res.headerFirst, 'text')[0].text).toBe('Cover header');
+  });
+
   it('omits titlePg and first-page zones when the flag is off', async () => {
     const bytes = await buildDocx(fixture, undefined, 'portrait', { ...hf, differentFirstPage: false }, { language: 'de', country: 'DE' });
     const documentXml = strFromU8(unzipSync(bytes)['word/document.xml']);

tests/roundtrip.test.ts

@@ -841,6 +841,32 @@ describe('Leg 3b: inline images in header/footer → buildOdt → importOdt', ()
   });
 });
 
+describe('Leg 3c: odd/even page header/footer → buildOdt → importOdt', () => {
+  it('round-trips the even-page variants and the flag alongside default + first', async () => {
+    const header: N = { type: 'doc', content: [P(null, T('Default header'))] };
+    const footer: N = { type: 'doc', content: [P(null, T('Default footer'))] };
+    const headerEven: N = { type: 'doc', content: [P({ textAlign: 'right' }, T('Even header'))] };
+    const footerEven: N = { type: 'doc', content: [P({ textAlign: 'center' }, T('Even footer'))] };
+    const headerFirst: N = { type: 'doc', content: [P(null, T('First header'))] };
+    const bytes = await buildOdt(fixture, margins, 'portrait',
+      { header, footer, headerEven, footerEven, differentOddEven: true, headerFirst, footerFirst: null, differentFirstPage: true, pageCount: 4 });
+    check('odd/even: styles.xml has <style:header-left>', strFromU8(unzipSync(bytes)['styles.xml']).includes('<style:header-left>'));
+
+    const res = importOdt(bytes);
+    check('odd/even: no warnings', res.warnings.length === 0, res.warnings);
+    check('odd/even: flag round-trips', res.differentOddEven === true, res.differentOddEven);
+    check('odd/even: even header round-trips', firstDiff(normalize(headerEven), normalize(res.headerEven)) === null, res.headerEven);
+    check('odd/even: even footer round-trips', firstDiff(normalize(footerEven), normalize(res.footerEven)) === null, res.footerEven);
+    check('odd/even: default + first still round-trip',
+      firstDiff(normalize(header), normalize(res.header)) === null && firstDiff(normalize(headerFirst), normalize(res.headerFirst)) === null, res.header);
+
+    const hfSchema = getSchema(hfExtensions());
+    let ok = true;
+    for (const z of [res.headerEven, res.footerEven]) { if (!z) continue; try { PMNode.fromJSON(hfSchema, z).check(); } catch { ok = false; } }
+    check('odd/even: even zones valid in hf schema', ok);
+  });
+});
+
 describe('Leg 4: foreign header/footer → importOdt', () => {
   it('parses page-number/count fields, reconstructs body margins, imports the first-page variant', () => {
     const fStyles = `<?xml version="1.0" encoding="UTF-8"?>