Upstream Hyperspace pairs a persistent left-edge #sidebar — icon-style nav links that never move — with a scroll sequence of full-screen sections: a fade-up #intro, a #content wrapper for the page body, and a closing #footer with a menu-style copyright row.

On this Dune port, #sidebar renders on every route from the shared layout, so navigating from / into a blog post or About page never loses that fixed nav. #intro is home-only and conditional on show_intro; when it's on, a .scrolly "Learn more" button smooth-scrolls to #content using the same anchor-click handler the layout registers for every href="#..." link, not a jQuery plugin. Inner pages skip #intro entirely and drop straight into #content with the page's own title and body.

Compare with html5up.net/hyperspace for the sidebar's icon spacing, the intro's fade-up timing, and how the sidebar collapses to a top bar at narrow widths. Honest deviations: search is Dune's server-side /api/search, not a client-side index; /archives and /about are generated Dune routes standing in for static HTML5 UP pages; contact forms from the original zip have no mail backend. No dark mode — Hyperspace upstream is one design, already dark by default, with no Dune scheme switcher layered on top.