diff --git a/.editorconfig b/.editorconfig
index 6e87a00..1cd2c0e 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -2,12 +2,16 @@
 root = true
 
 [*]
-charset = utf-8
 indent_style = space
 indent_size = 2
 insert_final_newline = true
 trim_trailing_whitespace = true
 
+# .NET sources use 4-space indent (dotnet format enforces this). The 2-space default
+# above is for the frontend (TS/HTML/CSS/JSON); C# keeps the .NET convention.
+[*.cs]
+indent_size = 4
+
 [*.md]
 max_line_length = off
 trim_trailing_whitespace = false