Create sidebars through an admin interface and apply widgets. Using conditions, apply the sidebars to certain pages / posts depending on what you select.
<h3>Versions</h3>
<ol>
<li>Version 1.0 – Initial Release</li>
<li>Version 1.1 – Passed slug to dynamic_sidebar at end of control mechanism (lost in original changes)</li>
</ol>

Sidebars

Create and apply sidebars to certain pages / posts.

Trevor Anderson

Split sidebars and widget areas into responsive columns.
Two simple widgets are provided, “Layout: New Column” and “Layout: New Column on New Row”.
Simply place these in your widget area where you’d like to create a new column (split) or new row of columns.
Gutter size and responsive collapse options are available in the Customizer -> Widget Columns panel.

Tuxedo Responsive Widget Columns

Just tested this plugin, and it works exactly as I hoped for. I can now have complex layouts in any widget areas. 
Of course it's best used for horizontal widget areas like footers, etc...



Works perfectly!

Split sidebars and widget areas into responsive columns.

Sidebars vs Tuxedo Responsive Widget Columns