diff --git a/src/reader.rs b/src/reader.rs
index 5971bdb..ce5f5e2 100644
--- a/src/reader.rs
+++ b/src/reader.rs
@@ -4,10 +4,10 @@ use crate::style::{StyleProfile, TextAlignment};
 use crate::theme::{self, BgType, Theme};
 
 pub fn recalculate_pages(book: &mut Book, font_size: f32, line_height: f32, panel_width: f32, panel_height: f32) {
-    // 中文全角字符宽度 ≈ 0.85 × font_size（含安全余量）
-    let char_width = font_size * 0.85;
-    // 安全系数：留 10% 余量抵消段落间距/缩进等样式增加的内容
-    let safety = 0.9;
+    // 中文全角字符宽度 ≈ 1.0 × font_size
+    let char_width = font_size * 1.0;
+    // 安全系数 0.97：抵消段落间距/缩进等样式增加的内容
+    let safety = 0.97;
     let chars_per_line = if char_width > 0.0 {
         ((panel_width / char_width) * safety).max(1.0) as usize
     } else {
@@ -59,6 +59,12 @@ pub fn reading_view(
     let mut jump_to_bookmark: Option<usize> = None;
 
      let colors = theme::reader_colors(theme);
+
+     // 工具栏之前预估文本区尺寸完成分页（扣除边距 48px + 工具条 ~60px）
+     let panel_size = ui.available_size();
+     let est_width = (panel_size.x - 48.0).max(100.0);
+     let est_height = (panel_size.y - 60.0).max(200.0);
+     recalculate_pages(book, style.font_size, style.line_height(), est_width, est_height);
     let has_bookmark = bookmarks.iter().any(|b| b.section == *current_section && b.page == *current_page);
 
     // --- Sidebar (TOC + Bookmarks) ---
@@ -217,16 +223,13 @@ egui::ComboBox::from_id_salt("bg_type_selector")
          let (rect, response) = ui.allocate_at_least(available, egui::Sense::click());
 
          // Add reading margins (inset)
-         let inset = 24.0;
-         let text_rect = egui::Rect::from_min_size(  
-             egui::pos2(rect.min.x + inset, rect.min.y),  
-             egui::vec2((rect.width() - inset * 2.0).max(100.0), rect.height()),  
-         );  
+          let inset = 24.0;
+          let text_rect = egui::Rect::from_min_size(
+              egui::pos2(rect.min.x + inset, rect.min.y),
+              egui::vec2((rect.width() - inset * 2.0).max(100.0), rect.height()),
+          );
 
-         // 在文本区域内用实际可用宽高重新分页
-         recalculate_pages(book, style.font_size, style.line_height(), text_rect.width(), text_rect.height());
-
-        if let Some(section) = book.sections.get(*current_section) {
+         if let Some(section) = book.sections.get(*current_section) {
             if *current_page < section.pages.len().saturating_sub(1) {
                 let start = section.pages[*current_page];
                 let end = section.pages[*current_page + 1];