How to write a site to make it easy to create applications for mobile?

Question

Mobile development

We are going to order the development of the site, and then necessarily mobile applications for it - on iOS and on Android.
In general, I am familiar with the development of sites, but I don’t know how it works in the application.
What is the actual question. Now there are 2 options for website development:
1. Draw, Layout (HTML + CSS + JS), put on any PHP framework.
2. Draw, Deploy (HTML + CSS + AngularJS), Backend (Node.js on Express.js Framework and MongoDB as database).
Which option is preferable, taking into account the facilitation of the subsequent creation of mobile applications?
The mobile offering will basically look like a responsive version of the site with a few visual/animation changes.

Answer 1

Mobile applications usually communicate with the site's REST interface. What exactly REST is written on is absolutely not important.

Answer 2

In order not to do double work - on the front - spa, on the back - the usual api (no matter what).