base16 light mode has computed higher contrast colors, with some opencode theme adjustments to use same colors but line up with neovim syntax groups

ghostty/.config/ghostty/themes/default-light

@@ -1,5 +1,10 @@
 # Scheme: Default Light
 # Generated by Ghostty Base16 Converter
+# NOTE: accent slots darkened from stock base16 to clear WCAG AA on the light
+# background (#f8f8f8). base16 holds accents constant across modes, which leaves
+# them washed out on white; these are hue-preserved AA (>=4.5) variants.
+# Dark theme (default-dark) keeps the canonical base16 values. red/brown already
+# passed and are unchanged. nvim inherits these via ctermfg (notermguicolors).
 background = f8f8f8
 foreground = 383838
 
@@ -8,21 +13,21 @@ selection-foreground = f8f8f8
 
 palette = 0=#f8f8f8
 palette = 1=#ab4642
-palette = 2=#a1b56c
-palette = 3=#f7ca88
-palette = 4=#7cafc2
-palette = 5=#ba8baf
-palette = 6=#86c1b9
+palette = 2=#66763b
+palette = 3=#9e620b
+palette = 4=#41788c
+palette = 5=#9c5d8d
+palette = 6=#3e7a72
 palette = 7=#383838
 palette = 8=#b8b8b8
 palette = 9=#ab4642
-palette = 10=#a1b56c
-palette = 11=#f7ca88
-palette = 12=#7cafc2
-palette = 13=#ba8baf
-palette = 14=#86c1b9
+palette = 10=#66763b
+palette = 11=#9e620b
+palette = 12=#41788c
+palette = 13=#9c5d8d
+palette = 14=#3e7a72
 palette = 15=#181818
-palette = 16=#dc9656
+palette = 16=#a56122
 palette = 17=#a16946
 palette = 18=#e8e8e8
 palette = 19=#d8d8d8