Refine layout.

packages/Header.sty

@@ -1,6 +1,15 @@
 \NeedsTeXFormat{LaTeX2e}
 \ProvidesPackage{PrimeTeX/packages/Header}[2025-08-16]
 
+\RequirePackage{PrimeTeX/packages/Layout}
+
+\providelength{\insideheaderoffset}[
+	\bigfloatoverhang * \real{\bigfloatoffsetratio}
+]
+\providelength{\outsideheaderoffset}[
+	\bigfloatoverhang / \real{\bigfloatoffsetratio}
+]
+
 % Header & Footer Options
 \RequirePackage{fancyhdr}
 \pagestyle{fancy}
@@ -11,11 +20,6 @@
 \renewcommand{\headrulewidth}{0pt}
 \renewcommand{\footrulewidth}{0pt}
 
-\newlength{\insideheaderoffset}
-\setlength{\insideheaderoffset}{0.5in}
-\newlength{\outsideheaderoffset}
-\setlength{\outsideheaderoffset}{1.0in}
-
 \NewDocumentCommand{\chapappname}{}{Chapter \thechapter{}: }
 \NewDocumentCommand{\partlabel}{}{\partname{} \thepart{}: \parttitle}