From 749cb0885872571b36d9b3174067911a47fd5e3b Mon Sep 17 00:00:00 2001
From: Craig Jennings <c@cjennings.net>
Date: Sat, 13 Jun 2026 18:19:25 -0500
Subject: Fix theme studio span endpoint tiles

---
 scripts/theme-studio/palette-actions.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'scripts/theme-studio/palette-actions.js')

diff --git a/scripts/theme-studio/palette-actions.js b/scripts/theme-studio/palette-actions.js
index 11f37d2f6..7fbac701b 100644
--- a/scripts/theme-studio/palette-actions.js
+++ b/scripts/theme-studio/palette-actions.js
@@ -35,7 +35,7 @@ function ensureGroundEndpoints(){
 }
 function normalizePalette(){PALETTE=PALETTE.map(normalizePaletteEntry);ensureGroundEndpoints();}
 // The ground column is explicit: bg pins the top endpoint, fg pins the bottom
-// endpoint, and generated ground-N steps live between them.
+// endpoint, and generated ground+N steps live between them.
 function groundColumnMembers(){
   return groundColumnMembersFromPalette(PALETTE,{bg:MAP['bg'],fg:MAP['p']});
 }
@@ -50,10 +50,13 @@ function setGroundSpan(n){
   const old=PALETTE.filter(entry=>groundRoleOfEntry(entry,{bg:MAP['bg'],fg:MAP['p']})==='step');
   const bg=srgb2oklab(MAP['bg']),fg=srgb2oklab(MAP['p']);
   const entries=[];
+  let step=1;
   for(let i=1;i<=n;i++){
     const t=i/(n+1);
     const lab={L:bg.L+(fg.L-bg.L)*t,a:bg.a+(fg.a-bg.a)*t,b:bg.b+(fg.b-bg.b)*t};
-    entries.push([lrgb2hex(oklab2lrgb(lab.L,lab.a,lab.b)),'ground-'+i,'ground']);
+    const hex=lrgb2hex(oklab2lrgb(lab.L,lab.a,lab.b));
+    if(hex.toLowerCase()==='#ffffff'||hex.toLowerCase()==='#000000')continue;
+    entries.push([hex,'ground+'+(step++),'ground']);
   }
   for(const [oldHex,oldName] of old){
     const next=entries.find(([,name])=>name===oldName);
-- 
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