Is there a way to get @def statments to get work in @if statments.
Whenever I try this, the @def last @if statment wins.For example:

@def backgroundColor #e00;

@if  platform p1{
    @def backgroundColor #F1C1BD;
}
@if platform p2{
   @def backgroundColor #FDDCC5;
}
@if platform p3{
    @def backgroundColor #F7C2DB;
}

backgroundColor is always #F7C2DB. The only way I've got it work is to
have explicit css rules in the if statement, which isn't very elegant:

@if platform p1 {
  body {
    background: #F1C1BD;
  }
}

@if platform p2 {
  body {
    background: #FDDCC5;
  }
}

@if platform p3 {
  body {
    background: #F7C2DB;
  }
}

The documentation says it should work, but isn't very helpfully btw:

What does it mean to have an @def or @eval in an @if block? Easy to
make this work for property-based @if statements; would have to
generate pretty gnarly runtime code to handle the expression-based @if
statement. Could have block-level scoping; but this seems like a
dubious use-case

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