diff --git a/CLAUDE.md b/CLAUDE.md
index 701acc8..7ac6b9b 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -29,6 +29,10 @@ Each calculator directory contains two files following the same pattern:
**External dependencies** (loaded via CDN, no install needed): Chart.js 4.4.1, Google Fonts (Fraunces + DM Sans).
+### OpenGraph
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+All pages must include OG meta tags (`og:type`, `og:locale`, `og:site_name`, `og:title`, `og:description`, `og:url`) and `twitter:card`. No `og:image` for now. Base URL: `https://forskjeller.naiv.no/`.
+
### Key Design Decisions
- Color palette: Blue (#1a4a8a) = A, Red (#c0392b) = B, Purple (#4a3a8a) = gap
diff --git a/public/arv/index.html b/public/arv/index.html
index 0b18bf7..fe70384 100644
--- a/public/arv/index.html
+++ b/public/arv/index.html
@@ -4,6 +4,13 @@
Arvens forsprang — interaktiv kalkulator
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diff --git a/public/bolig/index.html b/public/bolig/index.html
index 2bd8d7f..6eb1fbd 100644
--- a/public/bolig/index.html
+++ b/public/bolig/index.html
@@ -4,6 +4,13 @@
Boligforskjellen vokser — interaktiv kalkulator
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diff --git a/public/index.html b/public/index.html
index eb35b5f..f20aa3e 100644
--- a/public/index.html
+++ b/public/index.html
@@ -4,6 +4,13 @@
Forskjeller — interaktive visualiseringer
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