diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..af54a13
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,28 @@
+# Normalize line endings: store everything as LF in the repo.
+* text=auto eol=lf
+
+# Source files — always LF.
+*.cs        text eol=lf
+*.csproj    text eol=lf
+*.sln       text eol=lf
+*.props     text eol=lf
+*.json      text eol=lf
+*.js        text eol=lf
+*.jsx       text eol=lf
+*.ts        text eol=lf
+*.tsx       text eol=lf
+*.css       text eol=lf
+*.html      text eol=lf
+*.md        text eol=lf
+*.yml       text eol=lf
+*.yaml      text eol=lf
+*.sh        text eol=lf
+Dockerfile  text eol=lf
+*.conf      text eol=lf
+
+# Binary files — never touch.
+*.png       binary
+*.jpg       binary
+*.ico       binary
+*.pdf       binary
+*.pfx       binary