diff --git a/apps/site/tools/design-gate.mjs b/apps/site/tools/design-gate.mjs
index f2a04e7..788a3a4 100644
--- a/apps/site/tools/design-gate.mjs
+++ b/apps/site/tools/design-gate.mjs
@@ -26,7 +26,6 @@ const DEFAULT_CFG = {
       viewAttribute: "data-view",
       views: ["main"],
       h1: "h1",
-      h1MaxLines: 1,
       brand: ".brand",
     },
   ],
@@ -233,6 +232,53 @@ const UTILS = `
     const text = [...el.childNodes].find((node) => node.nodeType === 3 && node.textContent.trim());
     return window.__lines(text || el);
   };
+  window.__heading = (sel) => {
+    let el;
+    try { el = document.querySelector(sel); }
+    catch { return { state: "invalid" }; }
+    if (!el) return { state: "missing" };
+    if (!el.textContent.trim()) return { state: "empty" };
+    const box = el.getBoundingClientRect();
+    const hiddenAncestor = (() => {
+      for (let node = el; node && node !== document.documentElement; node = node.parentElement) {
+        const style = getComputedStyle(node);
+        if (style.display === "none" || style.visibility === "hidden" || style.visibility === "collapse" || style.contentVisibility === "hidden" || parseFloat(style.opacity) <= 0) return true;
+      }
+      return false;
+    })();
+    if (hiddenAncestor || box.width <= 0 || box.height <= 0) {
+      return { state: "hidden" };
+    }
+    const range = document.createRange();
+    range.selectNodeContents(el);
+    const rects = [...range.getClientRects()].filter((r) => r.width > 1 && r.height > 4);
+    const tops = rects.map((r) => r.top).sort((a, b) => a - b);
+    const lines = [];
+    for (const top of tops) if (!lines.length || top - lines[lines.length - 1] > 5) lines.push(top);
+    return { state: "visible", lines: lines.length, rects: rects.map((r) => ({ left: r.left, right: r.right, top: r.top, bottom: r.bottom })) };
+  };
+  window.__headingScaleAudit = (sel) => {
+    const heading = window.__heading(sel);
+    if (heading.state !== "visible") return heading;
+    const el = document.querySelector(sel);
+    const clipping = [];
+    const viewportWidth = document.documentElement.clientWidth;
+    for (const rect of heading.rects) {
+      if (rect.left < -1 || rect.right > viewportWidth + 1) clipping.push("viewport");
+    }
+    for (let ancestor = el; ancestor && ancestor !== document.documentElement; ancestor = ancestor.parentElement) {
+      const cs = getComputedStyle(ancestor);
+      const box = ancestor.getBoundingClientRect();
+      const name = ancestor.className ? "." + String(ancestor.className).trim().split(/\\s+/)[0] : ancestor.tagName.toLowerCase();
+      if (/^(hidden|clip|auto|scroll)$/.test(cs.overflowX) && heading.rects.some((rect) => rect.left < box.left - 1 || rect.right > box.right + 1)) clipping.push(name + "(x)");
+      if (/^(hidden|clip|auto|scroll)$/.test(cs.overflowY) && heading.rects.some((rect) => rect.top < box.top - 1 || rect.bottom > box.bottom + 1)) clipping.push(name + "(y)");
+    }
+    return {
+      ...heading,
+      documentOverflow: document.documentElement.scrollWidth - document.documentElement.clientWidth,
+      clipping: [...new Set(clipping)],
+    };
+  };
 `;
 
 const browser = await puppeteer.default.launch({ executablePath: CHROME, headless: "new", args: ["--force-device-scale-factor=1"] });
@@ -326,14 +372,19 @@ for (const p of CFG.pages) {
     }
     overs.length ? fail(`${p.name}/${v} 오버플로`, overs.join(" ")) : pass(`${p.name}/${v} 오버플로`, CFG.widths.join("/"));
 
-    // h1 줄 수 — 앱 화면은 기본 1줄, 마케팅 헤드라인은 페이지별로 최대 2줄까지 명시할 수 있다.
+    // 제목은 항상 존재·가시성을 확인하고, 줄 수는 페이지가 명시한 계약일 때만 검사한다.
     await page.setViewport({ width: 1440, height: 900 });
-    const h1l = await page.evaluate(`__lines(${JSON.stringify(p.h1 || "h1")})`);
-    const h1MaxLines = Number.isInteger(p.h1MaxLines) && p.h1MaxLines > 0 ? p.h1MaxLines : 1;
-    const h1Rule = h1MaxLines === 1 ? "h1 1줄" : `h1 최대 ${h1MaxLines}줄`;
-    h1l >= 1 && h1l <= h1MaxLines
-      ? pass(`${p.name}/${v} ${h1Rule}`)
-      : (h1l > h1MaxLines ? fail(`${p.name}/${v} h1 ${h1l}줄(최대 ${h1MaxLines}줄)`) : skip(`${p.name}/${v} h1`, "요소 없음"));
+    const h1Selector = p.h1 || "h1";
+    const h1 = await page.evaluate((sel) => window.__heading(sel), h1Selector);
+    const h1MaxLines = Number.isInteger(p.h1MaxLines) && p.h1MaxLines > 0 ? p.h1MaxLines : null;
+    if (h1.state === "missing") fail(`${p.name}/${v} h1`, `선택자 없음 (${h1Selector})`);
+    else if (h1.state === "empty") fail(`${p.name}/${v} h1`, "텍스트 없음");
+    else if (h1.state === "hidden") fail(`${p.name}/${v} h1`, `선택자가 숨김 (${h1Selector})`);
+    else if (h1.state === "invalid") fail(`${p.name}/${v} h1`, `잘못된 선택자 (${h1Selector})`);
+    else if (h1.lines < 1) fail(`${p.name}/${v} h1`, "텍스트 없음");
+    else if (h1MaxLines !== null && h1.lines > h1MaxLines) fail(`${p.name}/${v} h1`, `${h1.lines}줄(최대 ${h1MaxLines}줄)`);
+    else if (h1MaxLines !== null) pass(`${p.name}/${v} h1 최대 ${h1MaxLines}줄`, `${h1.lines}줄`);
+    else pass(`${p.name}/${v} h1 보임`, `${h1.lines}줄(줄수 계약 없음)`);
 
     // 세로 쌓임(수축) — 짧은 라벨 3줄 이상
     if (CFG.checks.stack) {
@@ -430,21 +481,34 @@ for (const p of CFG.pages) {
     }
   }
 
-  // ── 스케일×폭 h1 행렬 (안드로이드 글꼴 확대 재현) ──
+  // ── 스케일×폭 제목 행렬 (글꼴 확대에서 줄 수 증가와 잘림을 분리한다) ──
   if (CFG.checks.scaleMatrix) {
     const bad = [];
-    const h1MaxLines = Number.isInteger(p.h1MaxLines) && p.h1MaxLines > 0 ? p.h1MaxLines : 1;
+    const measurements = [];
     for (const w of [375, 390]) {
       for (const s of CFG.fontScales) {
         await page.setViewport({ width: w, height: 800, isMobile: true, hasTouch: true });
         await page.goto(href, { waitUntil: "networkidle0" });
         await page.evaluate(UTILS);
-        await page.addStyleTag({ content: `html { font-size: ${16 * s}px !important; }` });
-        const l = await page.evaluate(`__lines(${JSON.stringify(p.h1 || "h1")})`);
-        if (l > h1MaxLines) bad.push(`${w}@${s}x:${l}줄(최대 ${h1MaxLines}줄)`);
+        const baseRootSize = await page.evaluate(() => parseFloat(getComputedStyle(document.documentElement).fontSize));
+        if (!Number.isFinite(baseRootSize) || baseRootSize <= 0) {
+          bad.push(`${w}@${s}x:root font-size 측정 실패`);
+          continue;
+        }
+        await page.addStyleTag({ content: `html { font-size: ${baseRootSize * s}px !important; }` });
+        const h1 = await page.evaluate((sel) => window.__headingScaleAudit(sel), p.h1 || "h1");
+        const point = `${w}@${s}x`;
+        if (h1.state === "missing") { bad.push(`${point}:h1 선택자 없음 (${p.h1 || "h1"})`); continue; }
+        if (h1.state === "empty") { bad.push(`${point}:h1 텍스트 없음`); continue; }
+        if (h1.state === "hidden") { bad.push(`${point}:h1 선택자가 숨김 (${p.h1 || "h1"})`); continue; }
+        if (h1.state === "invalid") { bad.push(`${point}:h1 잘못된 선택자 (${p.h1 || "h1"})`); continue; }
+        if (h1.lines < 1) { bad.push(`${point}:h1 텍스트 없음`); continue; }
+        measurements.push(`${point}:${h1.lines}줄`);
+        if (s > 1 && h1.documentOverflow > 1) bad.push(`${point}:문서 가로오버플로 +${h1.documentOverflow}px`);
+        if (s > 1 && h1.clipping.length) bad.push(`${point}:제목 텍스트 클리핑 ${h1.clipping.join(",")}`);
       }
     }
-    bad.length ? fail(`${p.name} 스케일×폭 h1`, bad.join(",")) : pass(`${p.name} 스케일×폭 h1`, `최대 ${h1MaxLines}줄 · scales ${CFG.fontScales.join("/")}`);
+    bad.length ? fail(`${p.name} 스케일×폭 h1`, bad.join(",")) : pass(`${p.name} 스케일×폭 h1`, `줄수 정보 ${measurements.join(", ")}`);
     // 브랜드 1줄
     await page.setViewport({ width: 390, height: 844, isMobile: true, hasTouch: true });
     await page.goto(href, { waitUntil: "networkidle0" });
diff --git a/packages/skill/tools/design-gate-contract.test.mjs b/packages/skill/tools/design-gate-contract.test.mjs
index 9531202..22d9cbc 100644
--- a/packages/skill/tools/design-gate-contract.test.mjs
+++ b/packages/skill/tools/design-gate-contract.test.mjs
@@ -7,8 +7,16 @@ import url from "node:url";
 
 const repo = path.resolve(path.dirname(url.fileURLToPath(import.meta.url)), "../../..");
 const gate = path.join(repo, "apps/site/tools/design-gate.mjs");
+const packagedGate = path.join(repo, "packages/skill/tools/design-gate.mjs");
 const work = fs.mkdtempSync(path.join(os.tmpdir(), "design-gate-contract-"));
 
+const normalizedSource = (file) => fs.readFileSync(file, "utf8").replace(/\r\n/g, "\n");
+assert.equal(
+  normalizedSource(gate),
+  normalizedSource(packagedGate),
+  "apps/site/tools/design-gate.mjs must match packages/skill/tools/design-gate.mjs",
+);
+
 const configFor = (page, extra = {}) => ({
   pages: [{ name: "fixture", path: page, h1: "h1", ...extra }],
   widths: [375, 390],