RewriteEngine On
RewriteBase /

# Don't rewrite real files or directories
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]

# Don't rewrite asset paths
RewriteRule ^(css|js|assets)/ - [L]

# Route everything else to index.php
RewriteRule ^(.*)$ index.php [QSA,L]