Sometimes sibling pages should share a layout the URL never shows. A directory wrapped in parentheses is a route group — it scopes a layout without contributing a URL segment:

src/routes
    (marketing)
        layout.ts         wraps everything in the group
        about
            page.ts       -> /about   (not /marketing/about)
        contact
            page.ts       -> /contact
    page.ts               -> /

Here /about and /contact render inside the marketing layout, while / doesn't — even though all three live at the same URL depth.

Two pages may not resolve to the same path through different groups; kit rejects that at scan time.

Your task

1. In src/routes/(marketing)/layout.ts, add a Nav with links to /, /about, and /contact above children.

You're done when /about and /contact share the nav while / has none — the group scoped the layout without ever appearing in the URL.