improve NITRAC doc cover

NITLOAD-STANDARD-NITRAC/NITRAC-doc-1b.typ

@@ -47,7 +47,7 @@
         place(top + left, dx: i-left-indent, dy: 0pt, box(
           width: i-width,
           height: mark-height,
-          align(center + horizon, scale(x: 280%, y: i-stretch-y, reflow: false, i-mark)),
+          align(center + horizon, scale(x: 300%, y: i-stretch-y, reflow: false, i-mark)),
         ))
         place(top + left, dx: trac-offset, dy: 0pt, box(
           width: trac-width,
@@ -61,12 +61,14 @@
 
 #cover(
   title: "确定性自动化 实时与集成",
-  title-en: "Deterministic Automation - Realtime and Integration",
+  title-en: "Deterministic Automation  Real-time and Integration",
   logo: nitrac-mark,
   number: "NITRAC-DOC-1",
   author: "Nitload Industry",
   classification: "MID[中秘]SEC",
   date: "2026 年 9 月",
+  sub_title: "第一册：总则与基本原则",
+  sub_title_en: "Part 1: Overview and fundamental principles",
 )
 
 #show: conf.with(number-pages: true)