URI Ruting rule(s) for sub directorie(s) / folder(s)

[eluser]$@!ful[/eluser]
Directory structure of my controllers directory is:

Code:

-controllers
    -classic
        -visitor
            -home.php
        -admin
            -home.php
        -user
            -home.php
        -home.php
    -mobile
        -visitor
            -home.php
        -admin
            -home.php
        -user
            -home.php
        -home.php
    -home.php

My routing configuration settings are:

Code:

$route['default_controller'] = "classic/home";

$route['(:any)'] = "$1/home";

So when I browse:
sitename/ then it loads controllers/home.php
and when I browse sitename/classic then it lodes controllers/classic/home.php
but when I browse sitename/classic/visitor it generates a 404 error

Please help me to solve this problem.