Incorrect username or password

Hi, I was playing with the wp-admin.css file to edit the login page’s style then suddenly I wasn’t able to login anymore at all on the admin user. I don’t got other users on the website, so I can’t say I’ve tried on any other user. Now I am completely sure my password and username is correct. I’ve tried to activate the twentyeleven theme, deactivated all plugins through the database, changing my password on recovery, changing my password through the database, changing my password with this script http://codex.ww.wp.xz.cn/User:MichaelH/Orphaned_Plugins_needing_Adoption/Emergency and more but nothing works! Please help me! I’ve also changed my username through the database, it doesn’t work either!