From 99b29bb09fa8b0493022b6fb9e69c79c73c3ccda Mon Sep 17 00:00:00 2001
From: Bendik Aagaard Lynghaug <bendik.lynghaug@gmail.com>
Date: Tue, 1 Sep 2026 20:26:34 +0200
Subject: [PATCH] wordmark_invert: explicit, not inferred from .svg

A content-shipped colour logo (Klingenberg's red tile) was being
inverted to teal in light theme by the .svg heuristic. Invert is now
an explicit site.yaml flag defaulting to house-mark-only; content
logos keep their colours unless they opt in.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y42TyF8Zu7NGRR2893vNcZ
---
 Cargo.lock     |  2 +-
 src/app.rs     | 12 ++++--------
 src/content.rs |  6 ++++++
 3 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index ebf003e..ab56192 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2948,7 +2948,7 @@ dependencies = [
 
 [[package]]
 name = "portal"
-version = "0.3.25"
+version = "0.3.26"
 dependencies = [
  "anyhow",
  "arc-swap",
diff --git a/src/app.rs b/src/app.rs
index 5758cb8..e1d8cd2 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -587,14 +587,10 @@ fn Hero(title: String, description: String, landing: bool, site: SiteConfig, cur
         None
     };
     let has_module = module.is_some();
-    // Light theme inverts white-stroke wordmarks to ink. The house
-    // mark and the sibling-site marks are all white-stroke SVGs; a
-    // raster logo is a client brand and keeps its colors.
-    let house_wordmark = site
-        .wordmark
-        .as_deref()
-        .map(|w| w.ends_with(".svg"))
-        .unwrap_or(true);
+    // Light theme can invert a white-stroke wordmark to ink. Default:
+    // only the built-in house mark inverts; a content-shipped logo
+    // keeps its colours unless site.yaml opts in with wordmark_invert.
+    let house_wordmark = site.wordmark_invert.unwrap_or(site.wordmark.is_none());
     let wordmark = site.wordmark.clone().unwrap_or_else(|| "/wordmark.svg".to_string());
     // Clamped server-side too, but belt and braces for the inline style.
     let wordmark_style = site
diff --git a/src/content.rs b/src/content.rs
index db02c14..60bac79 100644
--- a/src/content.rs
+++ b/src/content.rs
@@ -523,6 +523,12 @@ pub struct SiteConfig {
     /// `None` falls back to `/wordmark.svg`.
     #[serde(default)]
     pub wordmark: Option<String>,
+    /// Whether to invert the wordmark in light theme. `None` inverts
+    /// only the built-in house wordmark (a white-stroke SVG); a
+    /// content-shipped logo keeps its own colours unless it sets this
+    /// true (e.g. a sibling site's white-stroke mark).
+    #[serde(default)]
+    pub wordmark_invert: Option<bool>,
     /// Wordmark display height in rem (0.5–6.0). `None` keeps the
     /// stylesheet's default. Raster logos look best at or below their
     /// intrinsic pixel height.