麻烦.htaccess，网站将无法正常工作

my htaccess file looks like this:

RewriteEngine on
RewriteCond $1 !^(index\.php|assets|img|css|js|robots\.txt|favicon\.ico)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ ./index.php/$1 [L,QSA]

But when I try to do anything on the website only the main website works ok. If I want to go to login page I'm getting an error:

No input file specified.

But if I change the .htaccess file to:

    RewriteEngine on
RewriteCond $1 !^(index\.php|assets|img|css|js|robots\.txt|favicon\.ico)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^ index.php [L]

The subpages work, but then I have trouble with the theme...

 --> 404 Page Not Found: Themes/default

Anyone have any idea to what should I change the htaccess file that the page would work. I'm using CodeIgniter.

OK, I've changed the .htaccess to:

RewriteEngine on
RewriteCond $1 !^(index\.php|assets|img|css|js|robots\.txt|favicon\.ico)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ ./index.php/?$1 [L,QSA]

Added ? before the $ sign and now the page loads ok. But now I have another problem with the theme.

ERROR - 2017-09-11 06:43:40 --> 404 Page Not Found: Themes/default

Also fix this: Must be the right directory path inside the config file.

Try it like this :

    RewriteEngine on
RewriteCond $1 !^(index\.php|assets|img|css|js|robots\.txt|favicon\.ico)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . index.php [QSA, L]

Try the below code:

RewriteEngine on
RewriteCond $1 !^(index\.php|public|\.txt)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?$1