assets/scss/_primer/support/variables/layout.scss
// Layout variables

// these are values for the display CSS property
$display-values: (
  block,
  flex,
  inline,
  inline-block,
  inline-flex,
  none,
  table,
  table-cell
) !default;

// maps edges to respective corners for border-radius
$edges: (
  top: (top-left, top-right),
  right: (top-right, bottom-right),
  bottom: (bottom-right, bottom-left),
  left: (bottom-left, top-left)
) !default;

// These are our margin and padding utility spacers. The default step size we
// use is 8px. This gives us a key of:
//    0 => 0px
//    1 => 4px
//    2 => 8px
//    3 => 16px
//    4 => 24px
//    5 => 32px
//    6 => 40px
$spacer: 8px !default;

// Our spacing scale
$spacer-0: 0 !default;                  // 0
$spacer-1: round($spacer / 2) !default; // 4px
$spacer-2: $spacer !default;            // 8px
$spacer-3: $spacer * 2 !default;        // 16px
$spacer-4: $spacer * 3 !default;        // 24px
$spacer-5: $spacer * 4 !default;        // 32px
$spacer-6: $spacer * 5 !default;        // 40px

// The list of spacer values
$spacers: (
  $spacer-0,
  $spacer-1,
  $spacer-2,
  $spacer-3,
  $spacer-4,
  $spacer-5,
  $spacer-6,
) !default;

// And the map of spacers, for easier looping:
// @each $scale, $length in $spacer-map { ... }
$spacer-map: (
  0: $spacer-0,
  1: $spacer-1,
  2: $spacer-2,
  3: $spacer-3,
  4: $spacer-4,
  5: $spacer-5,
  6: $spacer-6,
) !default;

// Increases the core spacing scale first by 8px for $spacer-7, then by 16px
// increments from $spacer-8 to $spacer-12, i.e. after 40px, we have 48, 64,
// 80, 96, etc.
$spacer-7:  $spacer * 6 !default;  // 48px
$spacer-8:  $spacer * 8 !default;  // 64px
$spacer-9:  $spacer * 10 !default; // 80px
$spacer-10: $spacer * 12 !default; // 96px
$spacer-11: $spacer * 14 !default; // 112px
$spacer-12: $spacer * 16 !default; // 128px

$spacers-large: (
  7: $spacer-7,
  8: $spacer-8,
  9: $spacer-9,
  10: $spacer-10,
  11: $spacer-11,
  12: $spacer-12,
) !default;

$spacer-map-extended: map-merge(
  (
    0: 0,
    1: $spacer-1,
    2: $spacer-2,
    3: $spacer-3,
    4: $spacer-4,
    5: $spacer-5,
    6: $spacer-6,
  ),
  $spacers-large,
) !default;

// Em spacer variables
$em-spacer-1: 0.0625em !default; // 1/16
$em-spacer-2: 0.125em !default;  // 1/8
$em-spacer-3: 0.25em !default;   // 1/4
$em-spacer-4: 0.375em !default;  // 3/8
$em-spacer-5: 0.5em !default;    // 1/2
$em-spacer-6: 0.75em !default;   // 3/4

// Size scale
// Used for buttons, inputs, labels, avatars etc.
$size: 16px !default;

$size-0: 0 !default;
$size-1: $size !default;           // 16px
$size-2: $size-1 +  4px !default;  // 20px
$size-3: $size-2 +  4px !default;  // 24px
$size-4: $size-3 +  4px !default;  // 28px
$size-5: $size-4 +  4px !default;  // 32px
$size-6: $size-5 +  8px !default;  // 40px
$size-7: $size-6 +  8px !default;  // 48px
$size-8: $size-7 + 16px !default;  // 64px

// Fixed-width container variables
$container-width: 980px !default;
$grid-gutter:     10px !default;

// Breakpoint widths
$width-xs: 0 !default;
// Small screen / phone
$width-sm: 544px !default;
// Medium screen / tablet
$width-md: 768px !default;
// Large screen / desktop (980 + (16 * 2)) <= container + gutters
$width-lg: 1012px !default;
// Extra large screen / wide desktop
$width-xl: 1280px !default;

// Responsive container widths
$container-sm: $width-sm !default;
$container-md: $width-md !default;
$container-lg: $width-lg !default;
$container-xl: $width-xl !default;

// Breakpoints in the form (name: length)
$breakpoints: (
  sm: $width-sm,
  md: $width-md,
  lg: $width-lg,
  xl: $width-xl
) !default;

// This map in the form (breakpoint: variant) is used to iterate over
// breakpoints and create both responsive and non-responsive classes in one
// loop:
//
// ```scss
// @each $breakpoint, $variant of $responsive-variants {
//   @include breakpoint($breakpoint) {
//     .foo#{$variant}-bar { foo: bar !important; }
//   }
// }
// ```
$responsive-variants: (
  "": "",
  sm: "-sm",
  md: "-md",
  lg: "-lg",
  xl: "-xl",
) !default;

// responive utility position values
$responsive-positions: (
  static,
  relative,
  absolute,
  fixed,
  sticky
) !default;

$sidebar-width: (
  sm: 220px,
  md: 256px,
  lg: 296px,
  xl: 320px
) !default;

$sidebar-narrow-width: (
  md: 240px,
  lg: 256px,
  xl: 296px
) !default;

$sidebar-wide-width: (
  md: 296px,
  lg: 320px,
  xl: 344px
) !default;

$gutter: (
  md: $spacer-3,
  lg: $spacer-4,
  xl: $spacer-5
) !default;

$gutter-condensed: (
  md: $spacer-3,
  lg: $spacer-3,
  xl: $spacer-4
) !default;

$gutter-spacious: (
  md: $spacer-4,
  lg: $spacer-5,
  xl: $spacer-6
) !default;
