$st-breakpoint-sm: 768px !default;
$st-breakpoint-md: 992px !default;
$st-breakpoint-lg: 1200px !default;
$st-breakpoint-xl: 1920px !default;

$st-breakpoints: (
  'xs' : (max-width: $st-breakpoint-sm),
  'sm' : (min-width: $st-breakpoint-sm),
  'md' : (min-width: $st-breakpoint-md),
  'lg' : (min-width: $st-breakpoint-lg),
  'xl' : (min-width: $st-breakpoint-xl)
);

$st-breakpoints-spec: (
  'xs-only' : (max-width: $st-breakpoint-sm - 1),
  'sm-and-up' : (min-width: $st-breakpoint-sm),
  'sm-only': '(min-width: #{$st-breakpoint-sm}) and (max-width: #{$st-breakpoint-md} - 1)',
  'sm-and-down': (max-width: $st-breakpoint-md - 1),
  'md-and-up' : (min-width: $st-breakpoint-md),
  'md-only': '(min-width: #{$st-breakpoint-md}) and (max-width: #{$st-breakpoint-lg } - 1)',
  'md-and-down': (max-width: $st-breakpoint-lg - 1),
  'lg-and-up' : (min-width: $st-breakpoint-lg),
  'lg-only': '(min-width: #{$st-breakpoint-lg}) and (max-width: #{$st-breakpoint-xl } - 1)',
  'lg-and-down': (max-width: $st-breakpoint-xl - 1),
  'xl-only' : (min-width: $st-breakpoint-xl),
);