Limit 50%-width rules to asset CFs, not _all_ CFs
Setting width: 49% when there is only one <tr> makes the text entry 0-width
Force full-width on the CFs, to line up vertically with the Basics columns
Set the <td>s to be inline-block as well, to fix rendering width

<td>s inside an inline-block render extremely oddly, failing to
correctly observe explicit width: constraints because they fail to find
any objects with display: table-row set above them.  Swap them to
inline-block, to provide a more consistent display.
Tighten up labels to reduce wrapping problems with inline-block

Redering <td>s as inline-block brings in somewwhat confusing redering
when the width is insufficient for the elements, wrapping them to the
next line.  Reduce the size of the labels to make the range of widths
with these problems smaller; once the window width is small enough, the
rendering switches to single-column, with none of these issues.