diff --git a/site/justfile b/site/justfile
index 9986459..009844f 100644
--- a/site/justfile
+++ b/site/justfile
@@ -19,6 +19,12 @@ default:
 # Start the HTMX-SSR dev server (auto-detects site/ in PWD)
 [no-cd]
 dev:
+    #!/usr/bin/env bash
+    export DATABASE_URL="${DATABASE_URL:-sqlite:data/dev.db}"
+    export HTMX_TEMPLATE_PATH="${HTMX_TEMPLATE_PATH:-htmx-templates}"
+    export RUSTELO_SITE_ROUTES="${RUSTELO_SITE_ROUTES:-site/config/routes}"
+    export SITE_BASE_URL="${SITE_BASE_URL:-https://ontoref.dev}"
+    export SITE_NAME="${SITE_NAME:-ontoref}"
     lsof -ti:3030 | xargs kill -9 2>/dev/null || true
     rustelo-htmx-server
 
@@ -655,7 +661,7 @@ sync: templates htmx-assets rotator-assets content
 # it ran by hand. `graph` here is content_graph.json, a different artifact; the name collision is
 # exactly what let the omission read as covered.
 [no-cd]
-sync-full: templates htmx-assets rotator-assets adr-pages expedientes informe catalog-content decks content glossary conceptos graph adr-map diagram about-json sync-artifacts check
+sync-full: templates htmx-assets rotator-assets adr-pages expedientes informe catalog-content decks spine content glossary conceptos graph adr-map taglines diagram about-json sync-artifacts check
 
 # The nu generators own these four files in site/public/r (the deploy tree); the serve
 # tree needs the same copies. `content` does this too, so a standalone `just content`
diff --git a/site/scripts/build/gen-spine-pages.nu b/site/scripts/build/gen-spine-pages.nu
index 079b40c..7d6b9f6 100644
--- a/site/scripts/build/gen-spine-pages.nu
+++ b/site/scripts/build/gen-spine-pages.nu
@@ -47,6 +47,16 @@ def main [
     for item in ($spine.doors | enumerate) {
       let d = $item.item
       let vp = (nickel export --format json $"($vp_dir)/($d.value_prop_id).ncl" | from json)
+      # Localized claim/problem_solved: use the optional `*_i18n` sibling for this
+      # lang WHEN it carries that lang key, else the canonical (English) scalar —
+      # so the 16 non-door vps (no sibling) and `en` (translations-only sibling)
+      # both fall back to the scalar. `get $col` on a dynamic name errors on a
+      # missing key, so presence is checked against `columns` first. Keeps the
+      # door pages bilingual without touching the Rust `ValueProp` struct.
+      let claim_i18n = ($vp.claim_i18n?)
+      let vp_claim = (if ($claim_i18n != null) and ($lang in ($claim_i18n | columns)) { $claim_i18n | get $lang } else { $vp.claim })
+      let problem_i18n = ($vp.problem_solved_i18n?)
+      let vp_problem = (if ($problem_i18n != null) and ($lang in ($problem_i18n | columns)) { $problem_i18n | get $lang } else { $vp.problem_solved })
       let label = ($d.label | get $lang)
       let line = ($d.line | get $lang)
       let blog_url = $"/blog?tag=($d.tag)"
@@ -60,7 +70,7 @@ def main [
         $"[Posts]\(($blog_url)\) · [Recipes]\(($recipes_url)\)"
       })
       let prize_label = (if $is_es { "El premio, al entrar" } else { "The prize, once inside" })
-      let excerpt = ($vp.problem_solved | lines | where ($it | str trim | is-not-empty) | first | str trim | str replace --all '"' "'")
+      let excerpt = ($vp_problem | lines | where ($it | str trim | is-not-empty) | first | str trim | str replace --all '"' "'")
       let cat_desc = (if $is_es { "Casos de uso e implementaciones de ontoref" } else { "Use cases and implementations of ontoref" })
 
       let proj_dir = $"($content)/domains/($lang)/use-cases"
@@ -100,9 +110,9 @@ category_published: true
 
 "
       })
-      let body = $"($hook_block)**($vp.claim)**
+      let body = $"($hook_block)**($vp_claim)**
 
-($vp.problem_solved)
+($vp_problem)
 
 ---