diff --git a/.gitignore b/.gitignore
index f332d9b..a471eb8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,53 @@
-.planning
\ No newline at end of file
+# Claude Code + GSD planning (local only)
+.claude/
+.planning/
+
+# Gradle
+.gradle/
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/**/build/
+gradle-app.setting
+.gradletasknamecache
+
+# Java
+*.class
+*.jar
+*.war
+*.ear
+*.nar
+hs_err_pid*
+replay_pid*
+
+# IntelliJ IDEA
+.idea/
+*.iml
+*.iws
+*.ipr
+out/
+
+# Eclipse
+.project
+.classpath
+.settings/
+bin/
+
+# VS Code
+.vscode/
+*.code-workspace
+
+# OS
+.DS_Store
+Thumbs.db
+desktop.ini
+
+# Hytale dev server / local run artifacts
+/run/
+/server/
+*.log
+logs/
+
+# Secrets / local env
+.env
+.env.local
+*.local