SSVE is a regex based view engine. If you look at the examples for Cassette or Squishit you see code such as:
@{
Bundles.Reference("content");
Bundles.Reference("scripts/app/page.js");
}
<!DOCTYPE html>
<html>
<head>
<title>Web App</title>
@Bundles.RenderStylesheets()
</head>
<body>
...
@Bundles.RenderScripts()
</body>
</html>
SSVE does not execute code blocks as such it has no method to execute the @Bundles.RenderStylesheets()
I was able to get around this be adding the output, in my case from Squishit to the ViewBag using the NancyFx pipeline.
Here is a blog post with screenshots: http://eric.polerecky.com/css-and-javascript-bundles-super-simple-view-engine/