<?php
Auth::routes();
//==========ここから追加==========
Route::prefix('login')->name('login.')->group(function () {
Route::get('/{provider}', 'Auth\LoginController@redirectToProvider')->name('{provider}');
});
//==========ここまで追加==========
Route::get('/', 'ArticleController@index')->name('articles.index');
// 略