Imported from maplibre/navara (skills/navara-lp/SKILL.md). Install upstream with npx skills add maplibre/navara --skill navara-lp. Copyright stays with the author.

Navara landing page

The marketing LP is a single Astro component with a global <style> block, driven by data files for theme/config, copy, and images. Design reference: design_handoff_navara_landing_page.

Files & the three-way split

• docs/src/components/LandingPage.astro — the whole page (markup + <style is:global> + reveal/showcase scripts). Rendered per locale by pages that do <LandingPage locale="..." />.
• docs/src/components/LpHeader.astro — the site header, shared with the docs site: variant="lp" (fixed/transparent, frosts via lp-header-solid toggled by LandingPage's script, carries the ?color switcher markup — its behavior script stays in LandingPage) and variant="docs" (Starlight Header override wraps it, inside Starlight's header shell, with a search slot; its LP vars are pinned from --nv-navy/--nv-cream set in docs/src/styles/theme.css). Header markup/styles/lang-select script live here, not in LandingPage. The examples gallery top page mirrors the same design in React (web/navara_three/example/components/SiteHeader.tsx).
• docs/src/data/lp.json — theme colors, image slots, external links (not copy). Colors: primary/accent/sub/maplibre (fed as CSS vars --pri/--acc/--sub/--ml; the derived --ink*/--on-dark*/--line* vars come from these). themeVariants lists candidate primary/sub/accent sets (verbatim from the design palette sheet) for the header preview switcher, revealed only by ?color in the URL (?color=<name> preselects one). Switching rewrites --pri/--sub/--acc at runtime; roles a candidate can't fill without losing contrast fall back to plain black/white via --pri-ink (always-dark ink/scrim source, = --pri normally), --on-band (text on --pri bands) and --on-acc — and a synthetic resize re-samples the adaptive gallery inks. images.<slot>.src is a repo-root-relative path into docs/src/assets or web/navara_three/example/public/screenshots, resolved by resolveImage.
• docs/src/data/lp-locales/<locale>.json — all copy, per locale. en is ROOT_LOCALE (served at /, others under /<locale>/). Image alt text lives here, in imageAlts keyed by the lp.json slot id (a missing alt throws at build).

To add a locale: add its lp-locales/<code>.json and a page rendering <LandingPage locale="code" />.

Conventions

• Never hardcode copy or colors in the component — copy → locale JSON, theme → lp.json. Markup pulls both via t.* and the --pri/--acc/... vars.
• Copy style: no dash decorations, no semicolons. LP copy (and alt text / meta strings) never uses em/en dashes, - parentheticals, or ; clause joins — write full sentences with commas, colons, or splits, and avoid stacked "and"s (prefer "from A and B to C and D, then …"). Sole exception: showcase tile names keep an ASCII - separator (they are the sites' official display names). The docs site follows the same rule — see docs/guide/WRITING_RULES.md ("Prose style").
• meta.description is the hero copy, compressed — the intro panel's first two sentences (definition + data range), without the third. The hero's third sentence is the extension ladder (declarative → plugins → custom representations), deliberately prefiguring the tier showcase below: keep it an escalation, never a restatement of sentence two. When the hero copy changes, re-derive the description.
• Images go through slots: define in lp.json, alt in every locale's imageAlts, reference with the src(id) / alt(id) helpers. Prefer AVIF for photos.
• Reveal-on-scroll: mark elements data-reveal (individually) or a container data-reveal-group (staggers children via --rd/--rd-base). Hidden states only exist under prefers-reduced-motion: no-preference, so reduced motion is a no-op. Don't reinvent entrance animation — reuse these hooks. Never put loading="lazy" images inside a reveal element: the reveal gates on decode() of every image inside, which never resolves for a lazy image still outside the viewport (e.g. off to the side in a scroller/marquee) — the element stays invisible forever.
• Showcase grid (.lp-showcase-grid): the gallery strip's third grid (tutorial → example → showcase), not a section of its own: square tiles, three per row (keep the item count a multiple of three so the full-bleed rows stay even), built from the showcase-* slots in lp.json (numeric order; href = the site's URL) — add/remove slots there plus imageAlts in every locale (the alt doubles as the hover title, so it's the site's display name). Screenshots live in docs/src/assets/showcases/<repo-name>.avif (PNG originals sit beside them, unreferenced so not bundled). The sticky side label crossfades TUTORIALS → EXAMPLES → SHOWCASES with one IntersectionObserver per grid, deepest intersecting grid wins (the example grid is still partly on screen while the label sits over the showcase grid). The label overlay carries no links ("See more" was dropped) and stays pointer-events: none throughout, so clicks fall through to the tile underneath. .lp-gallery-side's top clamps the sticky label's start so its BOTTOM first sits one bottom-gap above the first tile's bottom edge and never rides higher: top: calc(<.lp-tile-wide height> - var(--side-h) - <gap>), where --side-h is the label block's height, measured by script (vertical text — depends on font and wording; re-measured on webfont load and resize). The tile-height and gap terms must stay in sync with .lp-tile-wide and the label's bottom offset at each breakpoint. Showcase tile credits live in SHOWCASE_ATTRIB (keyed by slot id, not TILE_SOURCES): they are extracted verbatim from each site's own Navara attribution UI (scrape .navara-attr-item on the live site, drop the Navara self-credits, split rows that carry several links so each credit keeps one link) — re-extract when a site's data changes or a new site is added. GalleryTile hides the attribution icon while a tile's credit list is empty.
• Theme-derived tints: use color-mix(in oklab, var(--pri), white NN%) (matching the existing --ink*/--line* derivations) rather than raw hex, so a theme change in lp.json propagates.
• Deployment: the LP builds at /docs/lp/ (the Astro build uses base: "/docs") and scripts/assemble-site.mjs relocates it to the site root of https://navara.world/ (/ and /ja/). In astro dev/preview it is served at /docs/lp/. Pre-release: it carries <meta name="robots" content="noindex,nofollow">; leave that until release.
• Code snippets (.lp-hello HELLO WORLD section): the snippet is language-agnostic, so it lives in the component frontmatter (helloCode), not the locale JSONs — explanations stay in localized copy, code comments in English. Rendered with Astro's <Code theme="css-variables">; the --astro-code-* vars on .lp-hello-code map Shiki onto the LP palette so a theme change propagates. Every API call must be real (it's a TileJSON-based variant of the docs' Getting Started example — the TileJSON document supplies tile URL, zoom range, and attribution); verify against the docs before editing.
• Phone gutters are 20px for every band — keep section padding uniform so headings line up down the page; if a visual needs the extra width (the .lp-arch diagram), let it break out with negative margins instead of shrinking the section's padding.
• Stills bake in the example's own attribution button (bottom-right). Where the LP overlays its own ImageAttribution the baked one must be cropped away — .lp-hello-visual img is oversized (height: 106%) so the frame clips that band at every aspect ratio; don't crop the shared asset, docs pages use it.
• MapLibre section is parked behind SHOW_MAPLIBRE = false in the component frontmatter (copy and image slots kept); flip to true to bring it back.
• .lp-arch line-art SVGs are inlined (?raw + the archSvg helper, classes land on the <svg> so the img-era sizing rules still apply) and re-themed by CSS attribute selectors keyed to their baked hexes (#F4F3EF → --sub, #090C11 → --pri-ink, #C9C9C9 graticule). Re-exporting those SVGs must keep exactly those values, or the selectors in LandingPage.astro must be updated with them.

Reusable components

• docs/src/components/ImageAttribution.astro — data-attribution overlay: an info icon that reveals a per-source credit list on hover/focus (no plate, never overflows). Props: items: string[], label, corner (br/bl/tr/tl), class. Drop inside any position: relative image wrapper. Use it for any credited image, not just the LP. Source the credit strings from web/navara_three/example/helpers/constants.ts attribution fields (+ a basemap tilejson's own credit).

Brand logo & favicon

• Logo SVGs live in docs/public/logo/{black,white}/ (horizontal + vertical), mirrored in web/navara_three/example/public/logo/. They are the delivered Illustrator exports with the <i:aipgf> round-trip block stripped (that block was ~97% of the file size) and the viewBox cropped to the tight content bbox — keep both properties if the assets are ever re-delivered.
• The LP inlines the black variants via ?raw + logoSvg() (the black paths carry no fill attributes, so CSS fill: currentColor re-inks them per surface): .lp-hero-logo is the vertical lockup centered over the hero video, .lp-brand the horizontal one in the header. The branding hands off on scroll: the header logo is opacity: 0; visibility: hidden until lp-header-solid, at which point the intro panel has covered the hero lockup. .lp-video-blocked clears the hero lockup so the fallback play button gets the center.
• The favicon is the delivered white-bird-on-black-square mark, present as favicon.png (72×72, the referenced one) and favicon.svg (cleaned like the logos; kept but unreferenced) in both docs/public/ and web/.../example/public/. Three places point at /favicon.png: the LP <head>, Starlight's favicon option in docs/astro.config.mjs, and the example's template.html (injected into every generated page).

Build & verify

• cd docs && pnpm build (whole docs site) — LP copy/image errors surface here (missing alt, missing image, unknown slot).
• Verify interactive bits headlessly (Playwright against pnpm preview): reveal-on-scroll, the tier showcase cross-fade + synced list/caption highlight, the attribution tooltip. Look at the screenshots — a clean build can still be visually wrong.
• After Rust/WASM-adjacent changes elsewhere, also run repo-root pnpm run build:example, format, lint.

Hero video

The hero is the looping promo video (assets in docs/public/promo/: desktop + SP H.264 encodes, AVIF posters of the video's first frame; produced per the navara-promo-video skill). Implementation lives in LandingPage.astro (markup near the top, script mid-file, styles by .lp-hero). Hard-won invariants — do not regress these:

• iOS never fires loadeddata (or decodes a frame) until playback starts, so nothing may gate on it. The fade-in-then-play sequence primes instead: muted play() while the video is transparent, first playing event → pause + rewind + fade the static first frame in over the poster → play() again on transitionend (with a timeout fallback).
• Autoplay is refused in iOS Low Power Mode and cannot be forced; a tap-initiated play() still works — a centered play button appears via the lp-video-blocked class whenever the video is stopped unexpectedly.
• Exiting fullscreen pauses the video, and iOS can pause again after a successful programmatic resume (teardown race) — so the resume path retries and then verifies paused before falling back to the play button. The deliberate priming pause is excluded from that watchdog (fadeRestartPending).
• SP (≤640px) picks the smaller encode via matchMedia, crops center with object-fit: cover, and shows a bottom-right fullscreen button (webkitEnterFullscreen fallback for iPhones without video.requestFullscreen).
• Reduced motion keeps the AVIF poster; no video src is ever set.
• Video credits are overlaid, not baked, and scene-synced: the credit line baked into the video's bottom ~3.3% is force-cropped at every aspect ratio — poster and video are oversized (height: 104.5%, clipped by the hero's overflow: hidden; cover alone only crops vertically on wide windows, so a 16:10 window would otherwise show the baked line under the overlay) — and the hero renders one ImageAttribution block per scene (heroScenes in the frontmatter — credits + end boundary in seconds, read off the published cut's frames) and a timeupdate handler swaps them with playback; past the last boundary (the loop-closing still = the dive's first frame) it wraps to the first block, which is also the no-JS/reduced-motion state matching the poster. The Google logo rides only the Photorealistic-3D-Tiles scenes, whose credit list transcribes the per-tile copyright line baked into those frames (Google / Landsat / Copernicus / Data SIO… / Airbus for the current cut) — read it from the frames, not from the shot code, which only registers the static baseline. Re-cutting the promo means re-reading heroScenes boundaries and credits from the new take (extract 1 s frames with ffmpeg; zoom the bottom strip for the Google line). Generic .lp-hero img CSS must stay scoped to picture img, or it swallows the overlay's logo.
• .lp-hero must keep overflow: hidden. The opening animation (nv-hero-in) holds the full-viewport poster at scale ~1.045 for 3s; unclipped, that widens the document's scrollable area and Chromium keeps the stale horizontal scrollbar even after the animation ends (it only clears on the next relayout, e.g. scrolling into the reveal sections).
• Verify on a real iPhone (pnpm dev:docs --host), including Low Power Mode on/off — desktop Chromium allows muted autoplay everywhere and cannot reproduce any of the above.

Mobile viewport units and page ends

Desktop Chromium has no dynamic toolbar, so none of this reproduces there — these were all found on an iPhone.

• Covering elements use lvh, content bands use svh. The first scroll on iOS is spent collapsing the toolbar, which grows the viewport from svh to lvh: a sticky hero sized 100svh uncovers a strip of page background under the video exactly while that happens. .lp-hero is 100lvh and publishes --lp-toolbar-h: calc(100lvh - 100svh), which its bottom-anchored chrome (scroll cue, fullscreen button) adds back so it stays inside the smaller, toolbar-shown viewport it is first seen in. min-height bands (.lp-hello, .lp-outro) keep svh — they must fit the smaller viewport.
• A pin line that must hug the bottom edge uses dvh. .lp-intro sticks at calc(100dvh - var(--lp-intro-h)): with svh the panel stops a collapsed toolbar's height short of the bottom and leaves a strip of bare video under it, with lvh it is cut off while the toolbar is out. Only dvh follows the viewport that is actually on screen.
• viewport-fit=cover + --lp-safe-*. The meta viewport opts into the full screen so the full-bleed media (hero video, closing globe still) reaches the physical edges on notched phones — without it iOS insets the layout viewport and the closing band's image stops short of the bottom. svh/lvh then include the safe areas too, which is what makes the lvh hero cover the home-indicator strip. Everything that hugs an edge pays the inset back through --lp-safe-l/r/b (env(safe-area-inset-*, 0px) named on :root): the header and .lp-container for the landscape notch, .lp-intro, .lp-footer and the hero's bottom chrome for the home indicator. Because they are custom properties, a desktop browser can simulate a notch — append :root{--lp-safe-l:47px;--lp-safe-r:47px;--lp-safe-b:34px} to <body> (the LP's own <style is:global> lives there, so a <head> tag would lose the cascade).
• The page can never paint iOS Safari's toolbars — only tint them. viewport-fit=cover reaches the display's safe areas, not the browser chrome, so "extend the closing image under the URL bar" is not achievable; matching the color is. Safari tints its bars from <meta name="theme-color"> (falling back to the page background), so both that meta and the canvas are the closing band's --outro-bg black, and the bottom reads as one surface.
• body's background is the document canvas (html sets none), so it shows through the sub-pixel remainder of a fractional-height page, during overscroll, and as that toolbar tint. It is --outro-bg (black, hoisted to :root) — a light canvas showed as a ~1px white hairline under the closing band on iOS, and a --pri one as a navy seam below it. Every band paints its own background (.lp-main carries the light one).

References

• references/scene-tiers.md — the "4 API tiers, 1 engine" showcase (.lp-api-stage: cross-fading stills behind a bottom-right editorial open-circle ring — Declarative core, Plugin/API/Shader on the ring): building the fixed-camera, multi-look capture page (web/navara_three/example/pages/lp-tiers/), the four look recipes, night FogLight tuning, real OSM street lamps, and the capture→AVIF→slots workflow. Read this before creating or re-shooting those stills.