DESIGN STRUCTURE BRIEF

Answer these questions precisely so I understand exactly what you want.

1. HEADER
Full viewport width (stretches edge to edge)
Constrained to the RED BOX width (centered, max-width 1100px)
Is the header full-width or does it match the content box below?
OUTSIDE (above the red box)
INSIDE (top of the red box)
Does the red box start below the header, or does the header sit inside it?
How tall is the header?
2. RED BOX (Content Boundary)
What is the maximum width of the entire content area (the red box)?
Centered on the page (margin: 0 auto)
Is the red box centered or left-aligned?
Header
Left rail
Main content (700px)
Right rail
Savebar
Which elements are INSIDE the red box boundary?
3. LEFT RAIL (Filter/Categories)
INSIDE red box, on the left (takes up space)
FLOAT in the left margin (negative margin, outside content)
OFF-CANVAS DRAWER (hidden until toggled, slides in from left)
Where does the left rail sit at WIDE viewports?
At viewport LEFT EDGE (left: 0)
At RED BOX LEFT EDGE (inset from viewport)
Where does the left handle stick out from?
4. MAIN CONTENT
Centered (margin: 0 auto)
5. RIGHT RAIL (Preview/Actions)
INSIDE red box, on the right (takes up space)
FLOAT in the right margin (negative margin, outside content)
OFF-CANVAS DRAWER (hidden until toggled, slides in from right)
Where does the right rail sit at WIDE viewports?
At viewport RIGHT EDGE (right: 0)
At RED BOX RIGHT EDGE (inset from viewport)
Where does the right handle stick out from?
6. SAVEBAR (Bottom)
Full viewport width (stretches edge to edge)
Constrained to RED BOX width (centered, max-width 1100px)
Does the savebar stretch full-width or match the content box?
Fixed (stays at bottom of viewport as you scroll)
Absolute (below the red box, scrolls with content)
7. RESPONSIVE BREAKPOINT
At what viewport width do the rails become drawers?