diff --git a/public/assets/ai-assistant-figma/video/20250904-1414-49.4157894.webm b/public/assets/ai-assistant-figma/video/20250904-1414-49.4157894.webm
index b73db62..da577b0 100644
Binary files a/public/assets/ai-assistant-figma/video/20250904-1414-49.4157894.webm and b/public/assets/ai-assistant-figma/video/20250904-1414-49.4157894.webm differ
diff --git a/scripts/convert-videos.mjs b/scripts/convert-videos.mjs
index 335aa16..781c2cf 100644
--- a/scripts/convert-videos.mjs
+++ b/scripts/convert-videos.mjs
@@ -190,6 +190,9 @@ async function toWebm(inputPath, outPath, statusCtx) {
   } else {
     a.push("-an");
   }
+  // Резервируем место под Cues в начале файла, чтобы браузер мог перематывать
+  // (иначе Cues пишутся в конец и duration=N/A, seek не работает).
+  a.push("-reserve_index_space", "50000");
   a.push(outPath);
   const d = getDurationSec(inputPath);
   await runFfmpegProgress(a, {
diff --git a/scripts/serve-dev.mjs b/scripts/serve-dev.mjs
index ea45c70..db00934 100644
--- a/scripts/serve-dev.mjs
+++ b/scripts/serve-dev.mjs
@@ -237,11 +237,37 @@ function serveStatic(req, res) {
     }
     const ext = path.extname(filePath).toLowerCase();
     const mime = MIME[ext] || "application/octet-stream";
-    fs.readFile(filePath, (e2, data) => {
-      if (e2) { res.writeHead(500); res.end("Error"); return; }
-      res.writeHead(200, { "Content-Type": mime });
-      res.end(data);
+    const total = stat.size;
+    const range = req.headers.range;
+
+    // Поддержка Range-запросов — нужна браузеру для перемотки видео/аудио
+    if (range) {
+      const m = /^bytes=(\d*)-(\d*)$/.exec(range);
+      if (m) {
+        let start = m[1] ? parseInt(m[1], 10) : 0;
+        let end = m[2] ? parseInt(m[2], 10) : total - 1;
+        if (isNaN(start) || isNaN(end) || start > end || end >= total) {
+          res.writeHead(416, { "Content-Range": `bytes */${total}` });
+          res.end();
+          return;
+        }
+        res.writeHead(206, {
+          "Content-Type": mime,
+          "Content-Range": `bytes ${start}-${end}/${total}`,
+          "Accept-Ranges": "bytes",
+          "Content-Length": end - start + 1,
+        });
+        fs.createReadStream(filePath, { start, end }).pipe(res);
+        return;
+      }
+    }
+
+    res.writeHead(200, {
+      "Content-Type": mime,
+      "Accept-Ranges": "bytes",
+      "Content-Length": total,
     });
+    fs.createReadStream(filePath).pipe(res);
   });
 }