Full-screen intro, nav, and card grid

Upstream Massively opens on a full-screen title card, then settles into a logo header, a horizontal #nav bar, and a grid of post-excerpt cards. This port keeps that exact structure, driven by demo-config.json rather than hard-coded copy.

• #intro only renders on the home route (/ or /, checked via isHome in components/layout.tsx) and only when show_intro is true, as it is in this demo. intro_title and intro_subtitle fill the <h1> and supporting paragraph
• The scroll-down button inside #intro (a.button.icon.solid.solo.fa-arrow-down.scrolly) is wired up by inline script to smooth-scroll to #header — click it and confirm the page eases down instead of jump-cutting
• #nav items come from Dune’s site nav, with the active item flagged class="active" by comparing the normalized route, not by upstream’s static per-page class

Compare side-by-side with html5up.net/massively: the intro’s type scale, the header logo placement, and the post-card rhythm in #main should feel like the same family. The visible “Design: HTML5 UP” link in #copyright is required under CC BY while show_html5up_credit is on — this demo leaves it on rather than testing fidelity with the credit stripped.

Honest Dune deviations worth dogfooding: what was multi-page static HTML becomes /blog, /search, /archives, and /about routes; search hits server-side /api/search instead of a client-side Fuse index; and contact-style forms from the original HTML5 UP demo have no mail backend wired up. There is no dark mode — Massively upstream ships one design, and a Dune dark lift would be a deliberate enhancement, not a fidelity requirement.