// Padding / gap accept 1-, 2-, or 4-value forms (SPEC §5/§10).
layout: column; gap: 12; padding: 4 8;
|box| { width: 200; height: 30; "scalar padding" }
|box| { width: 200; height: 30; padding: 4 12; "v h padding" }
|box| { width: 200; height: 30; padding: 2 8 16 24; "t r b l padding" }
|box| { width: 200; height: 30; radius: 8; "radius 8" }
inner |group| {
layout: column; gap: 4 8; padding: 2 8 16 24;
|caption| "gap demo"
|box| { width: 80; height: 20; }
|box| { width: 80; height: 20; }
|box| { width: 80; height: 20; }
}