- Improve dark mode.

- Pass options to book class.

Color.sty

@@ -1,8 +1,32 @@
 \NeedsTeXFormat{LaTeX2e}
 \ProvidesPackage{PrimeTeX/Color}[2025-07-09]
 
+\RequirePackage{ifthen}
+
+\newboolean{colorIsDarkMode}
+\setboolean{colorIsDarkMode}{false}
+
+\DeclareOption{darkmode}{
+	\setboolean{colorIsDarkMode}{true}
+}
+\ProcessOptions\relax
+
 % Color import and definition
-%#region
-	\RequirePackage{xcolor}
-	\definecolor{PrimeBlue}{RGB}{192,224,255}%{25,45,145}
-%#endregion
+\RequirePackage{xcolor}
+
+\ifthenelse{\boolean{colorIsDarkMode}}{
+	\pagecolor[rgb]{0.2,0.2,0.2}
+	\color[rgb]{0.9,0.9,0.9}
+
+	\definecolor{pageColor}{rgb}{0.2,0.2,0.2}
+	\definecolor{paleGray}{rgb}{0.3,0.3,0.3}
+
+	\definecolor{PrimeBlue}{RGB}{149, 164, 237}
+	\definecolor{PrimePaleBlue}{RGB}{35, 39, 56}
+}{
+	\colorlet{pageColor}{white}
+	\colorlet{paleGray}{gray!10}
+
+	\definecolor{PrimeBlue}{RGB}{25,45,145}
+	\definecolor{PrimePaleBlue}{RGB}{233,236,251}
+}