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+# Asset Pipeline & Frontend Reliability Design
+
+**Date:** 2026-06-22
+**Status:** Approved for implementation
+
+## Problem
+
+The theme's frontend has three compounding reliability risks:
+
+1. **CDN dependency** — MapLibre GL, PhotoSwipe, Scrollama, toGeoJSON, and Google Fonts all load from external CDNs. A CDN outage or rate-limit takes the site down visually.
+2. **Duplicated JS logic** — The same behaviour is copy-pasted across multiple templates. Changing anything means finding and editing every copy.
+3. **No central loading strategy** — CDN `<script>` and `<link>` tags are scattered across templates, some loading the same library multiple times in different contexts.
+
+| Duplicated logic | Templates | Copies |
+|---|---|---|
+| PhotoSwipe lightbox init (~55 lines) | `trip.html.twig`, `dailies.html.twig` | 2 |
+| Photo strip IntersectionObserver + expand btn | `trip.html.twig`, `dailies.html.twig` | 2 |
+| Sort feed button | `trip.html.twig`, `dailies.html.twig`, `stories.html.twig` | 3 |
+| Back-to-top button | `trip.html.twig`, `story.html.twig` | 2 |
+| `haversineKm()` function | `maplibre-utils.js`, `trip.html.twig` | 2 |
+| Fullscreen map toggle | `feed-map.html.twig`, `trip.html.twig` | 2 |
+| MapLibre CDN script tags | `trip.html.twig`, `map.html.twig`, `feed-map.html.twig` | 3 |
+
+## Goals
+
+- Eliminate all CDN dependencies (JS, CSS, fonts) — site works with no internet access to external hosts
+- Every shared behaviour lives in exactly one place
+- No new framework complexity — the fix is organisation, not replacement
+- Grav-idiomatic output structure (follows Quark theme conventions)
+- Build runs via Docker — no local Node.js required
+
+## Non-goals
+
+- Refactoring map initialisation code across `trip.html.twig`, `feed-map.html.twig`, `map.html.twig` — deferred (see below)
+- CSS framework adoption — the existing token system is sound
+- Changes to `dailies.html.twig`, `stories.html.twig`, `map.html.twig` beyond removing CDN tags — those pages are not in active use
+
+## Architecture
+
+### Build system
+
+A single `make build-assets` command runs a throwaway Docker Node 20 Alpine container, mounts the theme directory, runs `npm ci && npm run build`, and exits. Output files are committed to the repo and served directly by Grav.
+
+```makefile
+build-assets:
+	docker run --rm \
+	  -v $(PWD)/user/themes/intotheeast:/app \
+	  -w /app node:20-alpine \
+	  sh -c "npm ci && npm run build"
+```
+
+The build command (in `package.json`) runs esbuild twice — once per entry point — and outputs IIFE bundles so they work as regular scripts without `type="module"`.
+
+### Output structure (Grav-idiomatic)
+
+Follows the Quark reference theme convention (`css-compiled/` for generated CSS, `fonts/` at theme root):
+
+```
+user/themes/intotheeast/
+├── package.json                  ← new
+├── package-lock.json             ← new, committed
+├── node_modules/                 ← gitignored
+├── js/
+│   ├── src/
+│   │   ├── main.js               ← new entry point
+│   │   └── map.js                ← new entry point
+│   ├── main.js                   ← esbuild output, committed
+│   ├── map.js                    ← esbuild output, committed
+│   └── maplibre-utils.js         ← existing, unchanged, imported by src/map.js
+├── css-compiled/                 ← new, Grav convention for generated CSS
+│   ├── main.css                  ← PhotoSwipe CSS extracted by esbuild
+│   └── map.css                   ← MapLibre GL CSS extracted by esbuild
+├── fonts/                        ← new, self-hosted woff2 files
+│   └── *.woff2                   ← copied by esbuild from @fontsource packages
+├── css/
+│   ├── tokens.css                ← unchanged
+│   └── style.css                 ← updated: remove Google Fonts @import, add @font-face
+└── templates/
+    └── partials/
+        └── base.html.twig        ← updated (see Template changes)
+```
+
+### npm dependencies
+
+```json
+{
+  "dependencies": {
+    "maplibre-gl": "^4",
+    "photoswipe": "^5",
+    "scrollama": "^3",
+    "@mapbox/togeojson": "^0.16.2",
+    "@fontsource-variable/dm-sans": "latest",
+    "@fontsource/dm-serif-display": "latest"
+  },
+  "devDependencies": {
+    "esbuild": "^0.21"
+  }
+}
+```
+
+### Bundle 1: `js/src/main.js` → `js/main.js`
+
+Loads on every page. Imports and initialises:
+
+- **PhotoSwipe 5** — lightbox init with keyboard arrow navigation and CSS transition classes. Currently copy-pasted verbatim in `trip.html.twig` (lines 566–626) and `dailies.html.twig` (lines 66–128).
+- **PhotoSwipe CSS** — `import 'photoswipe/dist/photoswipe.css'` → extracted to `css-compiled/main.css` by esbuild.
+- **Photo strip** — scroll dots sync (IntersectionObserver) + prev/next buttons + expand button. Currently in `base.html.twig` (lines 30–73, IIFE) and duplicated in `trip.html.twig` + `dailies.html.twig` (the IntersectionObserver variant).
+- **Sort feed button** — flip ascending/descending, update button text + aria-label, toggle `.is-active`. Currently in `trip.html.twig`, `dailies.html.twig`, `stories.html.twig` with slightly different container selectors. Unified as `initSortButton(btnId, containerSelector, itemSelector)`.
+- **Back-to-top button** — scroll threshold show/hide + smooth scroll. Currently in `trip.html.twig` (lines 544–561) and `story.html.twig` (lines 140–156).
+- **Panel toggles** — open/close collapsible stat and cycling panels. Currently inline in `trip.html.twig`.
+- **Scrollama** — imported here so `story.html.twig` can use it without a CDN tag. Only activates if `.scrolly` elements exist on the page.
+- **DM Sans variable font** — `import '@fontsource-variable/dm-sans/index.css'` covers weights 100–900 including italic axis. esbuild copies woff2 to `fonts/` and updates CSS references.
+- **DM Serif Display** — `import '@fontsource/dm-serif-display/400.css'` and `import '@fontsource/dm-serif-display/400-italic.css'`.
+
+All initialisers are called unconditionally — each guards with `if (!document.querySelector(...)) return` so they are silent no-ops on pages where the relevant elements don't exist.
+
+### Bundle 2: `js/src/map.js` → `js/map.js`
+
+Loads only on pages with a map. Imports:
+
+- **maplibre-gl** — attached to `window.maplibregl` so existing template inline map init scripts can reference it unchanged.
+- **MapLibre GL CSS** — `import 'maplibre-gl/dist/maplibre-gl.css'` → extracted to `css-compiled/map.css`.
+- **@mapbox/togeojson** — attached to `window.toGeoJSON`.
+- **`../maplibre-utils.js`** — existing file, unchanged. Attaches `window.MapUtils`.
+
+The existing map initialisation code in `trip.html.twig`, `feed-map.html.twig`, and `map.html.twig` references `maplibregl`, `toGeoJSON`, and `MapUtils` as globals — this bundle provides them without changing any of that code.
+
+### Template changes
+
+#### `base.html.twig`
+
+- **Remove** lines 7–9: Google Fonts `<link rel="preconnect">` and `<link href="fonts.googleapis.com/...">` tags
+- **Remove** lines 30–73: inline `<script>` block (photo strip IIFE) — moves to `main.js`
+- **Add** Asset Manager registrations:
+  ```twig
+  {% do assets.addCss('theme://css-compiled/main.css') %}
+  {% do assets.addJs('theme://js/main.js', {group: 'bottom'}) %}
+  ```
+- **Add** block for map pages:
+  ```twig
+  {% block map_assets %}{% endblock %}
+  ```
+
+#### `trip.html.twig`
+
+- **Remove** lines 247–250: MapLibre GL CSS link + MapLibre JS + toGeoJSON JS + maplibre-utils.js script tags
+- **Remove** lines 393–401: duplicate `haversineKm()` function — requires `haversineKm` to be added to `MapUtils` exports in `maplibre-utils.js` first, then the local `parseGpxFiles` caller updated to use `MapUtils.haversineKm`
+- **Remove** the following inline `<script>` blocks (all move to `main.js`):
+  - PhotoSwipe init (lines 566–626, `<script type="module">`)
+  - Sort toggle IIFE (lines 373–388)
+  - Filter bar IIFE (lines 339–371)
+  - Back-to-top IIFE (lines 544–561)
+  - Panel toggle `makePanelToggle` calls (lines 523–541)
+- **Keep** the map init block (`tripMap = new maplibregl.Map(...)` through to `tripMap.resize()`)
+- **Keep** the GPX parsing and cycling stats block (lines 403–542) — this is trip-specific logic, not shared
+- **Fill** the new map_assets block:
+  ```twig
+  {% block map_assets %}
+    {% do assets.addCss('theme://css-compiled/map.css') %}
+    {% do assets.addJs('theme://js/map.js', {group: 'bottom'}) %}
+  {% endblock %}
+  ```
+- **Add** PhotoSwipe CSS registration (currently a hardcoded `<link>` at line 4):
+  ```twig
+  {# PhotoSwipe CSS now bundled in css-compiled/main.css — remove line 4 #}
+  ```
+
+**Expected result:** `trip.html.twig` goes from ~627 lines to ~300 lines — Twig data logic + map init + GPX stats block only.
+
+#### `feed-map.html.twig`, `map.html.twig`
+
+- Remove CDN `<script>` and `<link>` tags for MapLibre, toGeoJSON, maplibre-utils
+- Fill `{% block map_assets %}` with the same Asset Manager registrations as trip.html.twig
+- Map init code unchanged
+
+#### `story.html.twig`
+
+- Remove Scrollama CDN `<script>` tag (line 72) — Scrollama now bundled in `main.js`
+- No other changes; all its inline JS is story-specific
+
+### Font self-hosting
+
+`@fontsource-variable/dm-sans` provides the variable font (weight + italic axes, single woff2 file). `@fontsource/dm-serif-display` provides static 400 and 400-italic. esbuild copies woff2 files to `fonts/` and generates `@font-face` declarations in the extracted CSS.
+
+`css/style.css` — remove the Google Fonts `@import` if present; font-family declarations remain unchanged since the CSS custom property names (`--font-display`, `--font-ui`) stay the same.
+
+### Git strategy
+
+- `package.json`, `package-lock.json` — committed
+- `node_modules/` — gitignored (add to `user/` repo `.gitignore`)
+- `js/main.js`, `js/map.js` — committed (Grav serves these directly)
+- `css-compiled/main.css`, `css-compiled/map.css` — committed
+- `fonts/*.woff2` — committed
+- `js/src/` — committed (source of truth for the bundles)
+
+Run `make build-assets` after updating any npm dependency. No need to run it for template or CSS changes.
+
+## Deferred
+
+### Map initialisation refactor
+
+The three map init blocks (`trip.html.twig`, `feed-map.html.twig`, `map.html.twig`) are intentionally different:
+
+- **trip**: sidebar column, journal + story markers, click scrolls feed card, fullscreen targets `.home-map-col`
+- **feed-map**: mini-map partial, one content type, click scrolls or navigates, Twig-interpolated JS variable names
+- **map**: full-page, click navigates to entry URL, has zoom controls
+
+Only `trip.html.twig` is in active use. The refactor — extracting a shared config-driven init into `maplibre-utils.js` — is deferred until the other pages become relevant.
+
+### `dailies.html.twig` and `stories.html.twig` JS cleanup
+
+Sort button, filter bar, and other inline JS remain in these templates for now. They will be cleaned up (calling shared functions from `main.js` instead of re-implementing) when those pages are actively developed.
+
+## Testing
+
+After `make build-assets`:
+
+1. Trip overview page loads — map renders, GPX track visible, markers clickable
+2. Sort button (↑/↓) reverses feed order
+3. Filter bar (All / Journal / Stories) shows/hides cards correctly
+4. Stats and Cycling panels open and close
+5. Back-to-top button appears after scrolling and scrolls to top
+6. Journal photo strip — dots sync on scroll, prev/next navigate, expand opens PhotoSwipe
+7. Story page — hero scroll effect, scroll-cue hides, title fades into nav, back-to-top works
+8. No requests to `cdn.jsdelivr.net`, `fonts.googleapis.com`, or `fonts.gstatic.com` in browser network tab