RewriteEngine On
RewriteBase /

# Serve existing files directly
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]

# Route everything else to index.php
RewriteRule ^ index.php [L]

# Security hardening
Options -Indexes
<FilesMatch "^\.">
  Require all denied
</FilesMatch>

