diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 89567ff..f14b668 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -43,6 +43,10 @@ jobs:
             test -s "out/$f" || { echo "::error::out/$f is missing"; exit 1; }
           done
 
+      # 🛡️ Hard limit: проверка веса JS-бандлов на каждой странице
+      - name: Check bundle size limit
+        run: npm run check:size
+
       - uses: actions/upload-pages-artifact@v5
         if: github.event_name != 'pull_request'
         with:
diff --git a/package.json b/package.json
index f77d4da..ef548f7 100644
--- a/package.json
+++ b/package.json
@@ -2,9 +2,10 @@
   "name": "shapak-apps-site",
   "version": "0.1.0",
   "private": true,
-  "scripts": {
+    "scripts": {
     "dev": "next dev",
-    "build": "next build"
+    "build": "next build",
+    "check:size": "node scripts/check-size.mjs"
   },
   "dependencies": {
     "next": "16.3.6",
diff --git a/scripts/check-size.mjs b/scripts/check-size.mjs
new file mode 100644
index 0000000..3f561d6
--- /dev/null
+++ b/scripts/check-size.mjs
@@ -0,0 +1,117 @@
+// scripts/check-size.mjs
+import fs from 'node:fs/promises';
+import path from 'node:path';
+import zlib from 'node:zlib';
+
+// --- CONFIG ---
+// Per-page gzip budget in KB. Single constant, as required by issue #6.
+const LIMIT_KB = 250;
+const OUT_DIR = 'out';
+
+async function findHtmlFiles(dir) {
+    let entries;
+    try {
+        entries = await fs.readdir(dir, { withFileTypes: true });
+    } catch {
+        return [];
+    }
+
+    const nested = await Promise.all(
+        entries.map((entry) => {
+            const fullPath = path.join(dir, entry.name);
+            if (entry.isDirectory()) return findHtmlFiles(fullPath);
+            if (entry.isFile() && entry.name === 'index.html') return fullPath;
+            return null;
+        }),
+    );
+    return nested.flat().filter(Boolean);
+}
+
+// No try/catch here: a missing file must throw, never silently count as 0 KB.
+async function getGzipSize(filePath) {
+    const buffer = await fs.readFile(filePath);
+    return zlib.gzipSync(buffer).length;
+}
+
+async function main() {
+    const htmlFiles = await findHtmlFiles(OUT_DIR);
+
+    if (htmlFiles.length === 0) {
+        console.error(`❌ No index.html files found in ${OUT_DIR}/. Did you run 'npm run build' first?`);
+        process.exit(1);
+    }
+
+    const results = [];
+    const missing = [];
+    let hasFailed = false;
+
+    for (const htmlFile of htmlFiles) {
+        const html = await fs.readFile(htmlFile, 'utf8');
+
+        const relDir = path.relative(OUT_DIR, path.dirname(htmlFile));
+        const route = relDir === '' ? '/' : '/' + relDir.split(path.sep).join('/') + '/';
+
+        const regex = /<script\b[^>]*\bsrc=["']([^"']+)["'][^>]*>/g;
+        const scriptPaths = new Set();
+        let match;
+        while ((match = regex.exec(html)) !== null) {
+            const src = match[1];
+            // Only local Next.js assets: a full URL must never map to a local path.
+            if (!src.startsWith('/_next/')) continue;
+            const cleanSrc = src.substring(1).split('?')[0].split('#')[0];
+            scriptPaths.add(path.join(OUT_DIR, cleanSrc));
+        }
+
+        let totalSize = 0;
+        for (const scriptPath of scriptPaths) {
+            try {
+                totalSize += await getGzipSize(scriptPath);
+            } catch (err) {
+                // A referenced chunk that does not exist is a FATAL error, not 0 KB.
+                if (err.code === 'ENOENT') {
+                    missing.push({ route, file: scriptPath });
+                } else {
+                    throw err;
+                }
+            }
+        }
+
+        const sizeKB = Math.round((totalSize / 1024) * 100) / 100;
+        const isOverLimit = sizeKB > LIMIT_KB;
+        if (isOverLimit) hasFailed = true;
+        results.push({ route, sizeKB, isOverLimit });
+    }
+
+    results.sort((a, b) => a.route.localeCompare(b.route));
+
+    console.log(`Page           | KB gzip (Limit: ${LIMIT_KB} KB)`);
+    console.log('-------------- | ---------------------------');
+    for (const res of results) {
+        const icon = res.isOverLimit ? '❌' : '✅';
+        const missCount = missing.filter((m) => m.route === res.route).length;
+        const note = missCount > 0 ? ` ⚠️ ${missCount} missing` : '';
+        console.log(`${res.route.padEnd(14)} | ${res.sizeKB} KB ${icon}${note}`);
+    }
+
+    let failed = hasFailed;
+
+    if (missing.length > 0) {
+        console.error(`\n❌ Error: ${missing.length} referenced file(s) missing from ${OUT_DIR}/:`);
+        for (const m of missing) {
+            console.error(`   page ${m.route} -> ${m.file}`);
+        }
+        failed = true;
+    }
+
+    if (hasFailed) {
+        console.error(`\n❌ Error: one or more pages exceed the limit of ${LIMIT_KB} KB gzip.`);
+    }
+
+    if (failed) process.exit(1);
+    console.log(`\n✅ Success: all pages are under the limit of ${LIMIT_KB} KB gzip.`);
+}
+
+main().catch((err) => {
+    console.error('Unexpected error:', err);
+    process.exit(1);
+});