diff --git a/src/reader.rs b/src/reader.rs
index fe8d2bc..5971bdb 100644
--- a/src/reader.rs
+++ b/src/reader.rs
@@ -4,14 +4,17 @@ 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) {
-    let char_width = font_size * 0.6;
+    // 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;
     let chars_per_line = if char_width > 0.0 {
-        (panel_width / char_width).max(1.0) as usize
+        ((panel_width / char_width) * safety).max(1.0) as usize
     } else {
         1
     };
     let lines_per_page = if line_height > 0.0 {
-        (panel_height / line_height).max(1.0) as usize
+        ((panel_height / line_height) * safety).max(1.0) as usize
     } else {
         1
     };
@@ -55,10 +58,7 @@ pub fn reading_view(
     };
     let mut jump_to_bookmark: Option<usize> = None;
 
-    let panel_size = ui.available_size();
-    recalculate_pages(book, style.font_size, style.line_height(), panel_size.x, panel_size.y);
-
-    let colors = theme::reader_colors(theme);
+     let colors = theme::reader_colors(theme);
     let has_bookmark = bookmarks.iter().any(|b| b.section == *current_section && b.page == *current_page);
 
     // --- Sidebar (TOC + Bookmarks) ---
@@ -217,11 +217,14 @@ 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 *current_page < section.pages.len().saturating_sub(1) {