Add a shadow to the Level 3 questions button. (#308)
Ensure Level 3 wait spinner is visible on smartphones. (#308)
Omit tooltips in Level 3 short questions on small screens.

Prevent tooltips from popping up sometimes when the user is trying
to open a question to answer it. (#308)
Move the working area node inside the filter list item node.

This cleans up the HTML to be valid: the working area div is
inside the list item rather than after it. The list item's
click event is canceled if the event happened in the working
area, preventing the earlier problem that prompted the
decision to insert after rather than append. (#308)
Cut background color for selected question on small screens. (#308)
Toggle the Level 3 filters list only on small screens. (#308)
Collapse questions list and scroll to top on small-screen Apply. (#308)
Help prevent a footer link from wrapping on small screens. (#308)
Make a variation that omits filter glossary links on small screens. (#308)
Move working area close button on small screen 'overlay.'

Place it at top left, where a 'Back' action would typically be on
smartphone screens, instead of at top right. (#308)
Widen the filter choices for small screens. (#308)
Clarify a comment. (#308)
Fix bug where working-area 'hint' was not being glossarized.

This bug affected both full-size and small screens. (#308)
Pull working-area glossary terms into a separate list on small screens.

Enable a variation for small screen testing that pulls the glossary
terms into a separate list instead of highlighting them with
tooltips as usual, so people don't accidentally trigger them
while trying to answer a multiple-choice question. (#308)
Improve sizing of wide character drawings on small screens. (#308)
Rework choice row layout for Level 3 small screens.

Move drawings to the left side so they do not divide the tap
area for the choice selection. Fix the sizing on the label
so it covers as much of the tap area as possible. Remove
border around drawing for simpler look. (#308)
Merge branch 'level3-smartphone-v2'