Remove the responsive two-column desktop arrangement and make the calculator stack vertically with a 4-column display button row that preserves alignment. Also align the display buttons with the shared base button styling.
Wrap the display controls in a dedicated grid container, add a spacer for the missing cell, and simplify the button styling so the layout stays consistent across sizes.
Wrap the display and control buttons in a shared display block so the
stack and button panels align as a single unit. Reduce corner radii and
adjust gaps/padding across the calculator to better fit the updated
portrait and desktop layouts.
Add clipboard paste handling for the hidden input and the paste button so pasted text is parsed as a numeric value before being pushed. Also add the eˣ function key in the sample calculator and keep the hidden input selected on focus for Ctrl+V support.
matmoul