diff --git a/PLAN.md b/PLAN.md
index 70673b5..f2c0e02 100644
--- a/PLAN.md
+++ b/PLAN.md
@@ -2212,6 +2212,18 @@ The app reuses the existing Pi REST API surface with no changes:
   companion, not a standalone tool. Cached trip data from the last sync is a nice-to-have
   but not required for v1.
 
+### UI Branding (2026-08-12)
+
+- **Sidebar background**: changed from dark navy (`#1a1a2e`) to dark gray (`#1c1c1e`).
+- **Logo**: replaced `fa-car` icon + text with a styled **YARIS-OBD** wordmark using
+  **Racing Sans One** (free Google Font, SIL OFL license, DMCA-safe). White italic text
+  with a red (`#e63946`) underline accent on the dark sidebar.
+- **Applied to both**: Pi (`templates/base.html`) and remote server
+  (`server/templates/base.html`) + mobile topbar on both.
+- **CSS**: new `.sidebar-brand-logo` class in `static/yaris.css` with `::after`
+  pseudo-element for the accent underline. Collapsed sidebar shrinks the logo and
+  hides the underline.
+
 ## Working Notes / Environment Gotchas
 
 - **Pi credentials/SSH**: `ssh yaris@<pi-ip>`. Confirm current IP before connecting (varies by