diff --git a/.agents/skills/tttk-authoring/reference.md b/.agents/skills/tttk-authoring/reference.md
index ed0975d..bad7c6a 100644
--- a/.agents/skills/tttk-authoring/reference.md
+++ b/.agents/skills/tttk-authoring/reference.md
@@ -116,13 +116,13 @@ Prefer the `yaml role=tag` form — it is the only form that supports template l
 
 Paginates a markdown document into A4 landscape sheets for printing.
 
-Each sheet holds two A5 pages side by side, and each A5 page flows the markdown into `columns` columns. `margin` and `gap` are in millimetres, `font` is in points. `pageNumbers` adds an `n / total` footer and `cutMarks` draws the centre cut line. The preview modal exports through the browser's print dialog (choose A4 landscape, no margins, 100% scale).
+Each sheet holds two A5 pages side by side, and each A5 page flows the markdown into `columns` columns. `margin`, `gap`, and `font` are in millimetres (the body font defaults to 3mm). `pageNumbers` adds an `n / total` footer in the outer corner and `cutMarks` draws the centre cut line. The preview modal exports through the browser's print dialog (choose A4 landscape, no margins, 100% scale).
 
 - Body: markdown path, optional #section
 - Attributes: `columns`, `margin`, `gap`, `font`, `title`, `pageNumbers`, `cutMarks`
 
 ```markdown
-:md-print[./rules.md]{columns="2" margin="10" gap="5" font="9"}
+:md-print[./rules.md]{columns="2" margin="10" gap="5" font="3"}
 ```
 
 ````markdown
@@ -132,7 +132,7 @@ body: ./rules.md
 columns: 2
 margin: 10
 gap: 5
-font: 9
+font: 3
 title: 规则书
 ```
 ````
diff --git a/docs/markdown.md b/docs/markdown.md
index 809f5bc..d44c83c 100644
--- a/docs/markdown.md
+++ b/docs/markdown.md
@@ -464,7 +464,7 @@ data-config:
 
 ```markdown
 :md-print[./rules.md]
-:md-print[./rules.md]{columns="2" margin="10" gap="5" font="9"}
+:md-print[./rules.md]{columns="2" margin="10" gap="5" font="3"}
 ```
 
 **功能：**
@@ -480,9 +480,9 @@ data-config:
 | `columns` | number | `2` | 每个 A5 页面的列数（1–4） |
 | `margin` | number | `10` | 页面边距（毫米） |
 | `gap` | number | `5` | 列间距（毫米） |
-| `font` | number | `9` | 正文字号（磅） |
+| `font` | number | `3` | 正文字号（毫米） |
 | `title` | string | - | 页眉标题 |
-| `pageNumbers` | boolean | `true` | 是否显示页码 |
+| `pageNumbers` | boolean | `true` | 是否在页面外侧角落显示页码 |
 | `cutMarks` | boolean | `true` | 是否显示 A4 中缝裁切线 |
 
 **YAML 写法：**
@@ -493,7 +493,7 @@ body: ./rules.md
 columns: 2
 margin: 10
 gap: 5
-font: 9
+font: 3
 title: 规则书
 ```
 
diff --git a/docs/reference.md b/docs/reference.md
index ed0975d..bad7c6a 100644
--- a/docs/reference.md
+++ b/docs/reference.md
@@ -116,13 +116,13 @@ Prefer the `yaml role=tag` form — it is the only form that supports template l
 
 Paginates a markdown document into A4 landscape sheets for printing.
 
-Each sheet holds two A5 pages side by side, and each A5 page flows the markdown into `columns` columns. `margin` and `gap` are in millimetres, `font` is in points. `pageNumbers` adds an `n / total` footer and `cutMarks` draws the centre cut line. The preview modal exports through the browser's print dialog (choose A4 landscape, no margins, 100% scale).
+Each sheet holds two A5 pages side by side, and each A5 page flows the markdown into `columns` columns. `margin`, `gap`, and `font` are in millimetres (the body font defaults to 3mm). `pageNumbers` adds an `n / total` footer in the outer corner and `cutMarks` draws the centre cut line. The preview modal exports through the browser's print dialog (choose A4 landscape, no margins, 100% scale).
 
 - Body: markdown path, optional #section
 - Attributes: `columns`, `margin`, `gap`, `font`, `title`, `pageNumbers`, `cutMarks`
 
 ```markdown
-:md-print[./rules.md]{columns="2" margin="10" gap="5" font="9"}
+:md-print[./rules.md]{columns="2" margin="10" gap="5" font="3"}
 ```
 
 ````markdown
@@ -132,7 +132,7 @@ body: ./rules.md
 columns: 2
 margin: 10
 gap: 5
-font: 9
+font: 3
 title: 规则书
 ```
 ````
diff --git a/src/cli/validate/known.ts b/src/cli/validate/known.ts
index c17ec69..1f46cff 100644
--- a/src/cli/validate/known.ts
+++ b/src/cli/validate/known.ts
@@ -82,11 +82,11 @@ export const KNOWN_ELEMENTS: readonly ElementSpec[] = [
     summary:
       "Paginates a markdown document into A4 landscape sheets for printing.",
     details:
-      "Each sheet holds two A5 pages side by side, and each A5 page flows the markdown into `columns` columns. `margin` and `gap` are in millimetres, `font` is in points. `pageNumbers` adds an `n / total` footer and `cutMarks` draws the centre cut line. The preview modal exports through the browser's print dialog (choose A4 landscape, no margins, 100% scale).",
+      "Each sheet holds two A5 pages side by side, and each A5 page flows the markdown into `columns` columns. `margin`, `gap`, and `font` are in millimetres (the body font defaults to 3mm). `pageNumbers` adds an `n / total` footer in the outer corner and `cutMarks` draws the centre cut line. The preview modal exports through the browser's print dialog (choose A4 landscape, no margins, 100% scale).",
     refKind: "md",
     examples: [
-      ':md-print[./rules.md]{columns="2" margin="10" gap="5" font="9"}',
-      "```yaml role=tag\ntag: md-print\nbody: ./rules.md\ncolumns: 2\nmargin: 10\ngap: 5\nfont: 9\ntitle: 规则书\n```",
+      ':md-print[./rules.md]{columns="2" margin="10" gap="5" font="3"}',
+      "```yaml role=tag\ntag: md-print\nbody: ./rules.md\ncolumns: 2\nmargin: 10\ngap: 5\nfont: 3\ntitle: 规则书\n```",
     ],
   },
   {
diff --git a/src/components/md-print/PrintPreview.tsx b/src/components/md-print/PrintPreview.tsx
index 6f55f93..dba2c20 100644
--- a/src/components/md-print/PrintPreview.tsx
+++ b/src/components/md-print/PrintPreview.tsx
@@ -90,7 +90,15 @@ export function PrintPreview(props: PrintPreviewProps) {
       const result = paginate(source, options(), mount);
       result.pages.forEach((page, index) => {
         const footer = page.querySelector(".md-print-footer");
-        if (footer) footer.textContent = `${index + 1} / ${result.pages.length}`;
+        if (footer) {
+          footer.textContent = `${index + 1} / ${result.pages.length}`;
+          // Left A5 gets the left corner, right A5 gets the right corner.
+          footer.classList.add(
+            index % 2 === 0
+              ? "md-print-footer--left"
+              : "md-print-footer--right",
+          );
+        }
       });
       setPages(result.pages);
       setWarnings(result.warnings);
@@ -224,7 +232,7 @@ export function PrintPreview(props: PrintPreviewProps) {
             class="md-print-content prose"
             style={{
               width: `${columnWidthMm(props.config)}mm`,
-              "--md-print-font-size": `${props.config.font}pt`,
+              "--md-print-font-size": `${props.config.font}mm`,
               position: "absolute",
               left: "-99999px",
               top: "0",
diff --git a/src/components/md-print/config.test.ts b/src/components/md-print/config.test.ts
index 3b13d42..77bb068 100644
--- a/src/components/md-print/config.test.ts
+++ b/src/components/md-print/config.test.ts
@@ -18,11 +18,16 @@ describe("normalizePrintConfig", () => {
     expect(config.columns).toBe(3);
     expect(config.margin).toBe(40);
     expect(config.gap).toBe(0);
-    expect(config.font).toBe(16);
+    expect(config.font).toBe(6);
     expect(config.pageNumbers).toBe(false);
     expect(config.cutMarks).toBe(false);
   });
 
+  test("clamps font to 2..6mm", () => {
+    expect(normalizePrintConfig({ font: "1" }).font).toBe(2);
+    expect(normalizePrintConfig({ font: "20" }).font).toBe(6);
+  });
+
   test("clamps columns to 1..4", () => {
     expect(normalizePrintConfig({ columns: "0" }).columns).toBe(1);
     expect(normalizePrintConfig({ columns: "9" }).columns).toBe(4);
@@ -33,7 +38,7 @@ describe("normalizePrintConfig", () => {
       columns: 2,
       margin: 12,
       gap: 6,
-      font: 10,
+      font: 3,
       title: "规则书",
       pageNumbers: true,
       cutMarks: false,
@@ -43,7 +48,7 @@ describe("normalizePrintConfig", () => {
       columns: 2,
       margin: 12,
       gap: 6,
-      font: 10,
+      font: 3,
       title: "规则书",
       pageNumbers: true,
       cutMarks: false,
diff --git a/src/components/md-print/config.ts b/src/components/md-print/config.ts
index f9d5c61..a4e156f 100644
--- a/src/components/md-print/config.ts
+++ b/src/components/md-print/config.ts
@@ -4,7 +4,7 @@ export const PRINT_DEFAULTS: PrintConfig = {
   columns: 2,
   margin: 10,
   gap: 5,
-  font: 9,
+  font: 3,
   title: "",
   pageNumbers: true,
   cutMarks: true,
@@ -43,7 +43,7 @@ export function normalizePrintConfig(
     ),
     margin: clamp(toNumber(input.margin, PRINT_DEFAULTS.margin), 5, 40),
     gap: clamp(toNumber(input.gap, PRINT_DEFAULTS.gap), 0, 20),
-    font: clamp(toNumber(input.font, PRINT_DEFAULTS.font), 6, 16),
+    font: clamp(toNumber(input.font, PRINT_DEFAULTS.font), 2, 6),
     title:
       typeof input.title === "string" ? input.title : PRINT_DEFAULTS.title,
     pageNumbers: toBoolean(input.pageNumbers, PRINT_DEFAULTS.pageNumbers),
diff --git a/src/components/md-print/index.tsx b/src/components/md-print/index.tsx
index a6dc781..82e2cc3 100644
--- a/src/components/md-print/index.tsx
+++ b/src/components/md-print/index.tsx
@@ -12,7 +12,7 @@ customElement<PrintProps>(
     columns: "2",
     margin: "10",
     gap: "5",
-    font: "9",
+    font: "3",
     title: "",
     pageNumbers: "true",
     cutMarks: "true",
diff --git a/src/components/md-print/paginate.ts b/src/components/md-print/paginate.ts
index bc24ae1..685fd84 100644
--- a/src/components/md-print/paginate.ts
+++ b/src/components/md-print/paginate.ts
@@ -54,7 +54,7 @@ export function createPageElement(opts: PaginateOptions): {
   page.style.position = "relative";
   page.style.overflow = "hidden";
   page.style.background = "white";
-  page.style.setProperty("--md-print-font-size", `${opts.font}pt`);
+  page.style.setProperty("--md-print-font-size", `${opts.font}mm`);
 
   if (opts.title) {
     const header = document.createElement("div");
diff --git a/src/components/md-print/types.ts b/src/components/md-print/types.ts
index 10c0a5a..3f72630 100644
--- a/src/components/md-print/types.ts
+++ b/src/components/md-print/types.ts
@@ -5,7 +5,7 @@ export interface PrintConfig {
   margin: number;
   /** Column gap in millimetres. */
   gap: number;
-  /** Body font size in points. */
+  /** Body font size in millimetres. */
   font: number;
   /** Running header text. Empty hides the header. */
   title: string;
diff --git a/src/doc-entries/md-print.md b/src/doc-entries/md-print.md
index 08895e2..6bffaad 100644
--- a/src/doc-entries/md-print.md
+++ b/src/doc-entries/md-print.md
@@ -17,7 +17,7 @@ title: 打印版式
 **自定义版式：**
 
 ```markdown
-:md-print[./rules.md]{columns="2" margin="10" gap="5" font="9"}
+:md-print[./rules.md]{columns="2" margin="10" gap="5" font="3"}
 ```
 
 **YAML 写法：**
@@ -28,7 +28,7 @@ body: ./rules.md
 columns: 2
 margin: 10
 gap: 5
-font: 9
+font: 3
 title: 规则书
 ```
 
@@ -41,9 +41,9 @@ title: 规则书
 | `columns` | number | `2` | 每个 A5 页面的列数（1–4） |
 | `margin` | number | `10` | 页面边距（毫米） |
 | `gap` | number | `5` | 列间距（毫米） |
-| `font` | number | `9` | 正文字号（磅） |
+| `font` | number | `3` | 正文字号（毫米） |
 | `title` | string | — | 页眉标题 |
-| `pageNumbers` | boolean | `true` | 是否显示 `n / 总数` 页码 |
+| `pageNumbers` | boolean | `true` | 是否在页面外侧角落显示 `n / 总数` 页码 |
 | `cutMarks` | boolean | `true` | 是否显示 A4 中缝裁切线 |
 
 ## 打印设置
diff --git a/src/styles.css b/src/styles.css
index e6dfb91..5dc72a1 100644
--- a/src/styles.css
+++ b/src/styles.css
@@ -204,7 +204,7 @@ icon.big .icon-label-stroke {
 }
 
 .md-print-content {
-    font-size: var(--md-print-font-size, 9pt);
+    font-size: var(--md-print-font-size, 3mm);
     line-height: 1.45;
     color: #000;
     max-width: none;
@@ -257,11 +257,11 @@ icon.big .icon-label-stroke {
     pointer-events: none;
 }
 
-.md-print-header,
-.md-print-footer {
+.md-print-header {
     position: absolute;
     left: 0;
     right: 0;
+    top: 3mm;
     text-align: center;
     font-size: 8pt;
     color: #6b7280;
@@ -270,12 +270,25 @@ icon.big .icon-label-stroke {
     text-overflow: ellipsis;
 }
 
-.md-print-header {
-    top: 3mm;
+.md-print-footer {
+    position: absolute;
+    bottom: 3mm;
+    left: 3mm;
+    font-size: 8pt;
+    color: #6b7280;
+    white-space: nowrap;
 }
 
-.md-print-footer {
-    bottom: 3mm;
+.md-print-footer--left {
+    left: 3mm;
+    right: auto;
+    text-align: left;
+}
+
+.md-print-footer--right {
+    left: auto;
+    right: 3mm;
+    text-align: right;
 }
 
 @media print {