$sl-color--hopbush:       #c69    !default;
$sl-color--bouquet:       #b37399 !default;
$sl-color--venus:         #998099 !default;
$sl-color--patina:        #699    !default;
$sl-color--nebula:        #d2e1dd !default;
$sl-color--white:         #fff    !default;
$sl-color--dawn-pink:     #f2ece4 !default;
$sl-color--wafer:         #e1d7d2 !default;
$sl-color--iron:          #dadbdf !default;
$sl-color--regent-grey:   #808c99 !default;
$sl-color--pale-sky:      #6b717f !default;
$sl-color--midnight-blue: #036    !default;

$sl-colors: (
  hopbush:       $sl-color--hopbush,
  bouquet:       $sl-color--bouquet,
  venus:         $sl-color--venus,
  patina:        $sl-color--patina,
  nebula:        $sl-color--nebula,
  white:         $sl-color--white,
  dawn-pink:     $sl-color--dawn-pink,
  wafer:         $sl-color--wafer,
  iron:          $sl-color--iron,
  regent-grey:   $sl-color--regent-grey,
  pale-sky:      $sl-color--pale-sky,
  midnight-blue: $sl-color--midnight-blue,
);

@function luminance($color) {
  $red: nth($linear-channel-values, red($color) + 1);
  $green: nth($linear-channel-values, green($color) + 1);
  $blue: nth($linear-channel-values, blue($color) + 1);

  @return .2126 * $red + .7152 * $green + .0722 * $blue;
}

@function contrast($back, $front) {
  $backLum: luminance($back) + .05;
  $foreLum: luminance($front) + .05;

  @return max($backLum, $foreLum) / min($backLum, $foreLum);
}

@function choose-contrast-color($color) {
  $lightContrast: contrast($color, $sl-color--white);
  $darkContrast: contrast($color, $sl-color--black);

  @if ($lightContrast > $darkContrast) {
    @return $sl-color--white;
  }
  @else {
    @return $sl-color--black;
  }
}

$linear-channel-values:
  0
  .0003035269835488375
  .000607053967097675
  .0009105809506465125
  .00121410793419535
  .0015176349177441874
  .001821161901293025
  .0021246888848418626
  .0024282158683907
  .0027317428519395373
  .003035269835488375
  .003346535763899161
  .003676507324047436
  .004024717018496307
  .004391442037410293
  .004776953480693729
  .005181516702338386
  .005605391624202723
  .006048833022857054
  .006512090792594475
  .006995410187265387
  .007499032043226175
  .008023192985384994
  .008568125618069307
  .009134058702220787
  .00972121732023785
  .010329823029626936
  .010960094006488246
  .011612245179743885
  .012286488356915872
  .012983032342173012
  .013702083047289686
  .014443843596092545
  .01520851442291271
  .01599629336550963
  .016807375752887384
  .017641954488384078
  .018500220128379697
  .019382360956935723
  .0202885630566524
  .021219010376003555
  .022173884793387385
  .02315336617811041
  .024157632448504756
  .02518685962736163
  .026241221894849898
  .027320891639074894
  .028426039504420793
  .0295568344378088
  .030713443732993635
  .03189603307301153
  .033104766570885055
  .03433980680868217
  .03560131487502034
  .03688945040110004
  .0382043715953465
  .03954623527673284
  .04091519690685319
  .042311410620809675
  .043735029256973465
  .04518620438567554
  .046665086336880095
  .04817182422688942
  .04970656598412723
  .05126945837404324
  .052860647023180246
  .05448027644244237
  .05612849004960009
  .05780543019106723
  .0595112381629812
  .06124605423161761
  .06301001765316767
  .06480326669290577
  .06662593864377289
  .06847816984440017
  .07036009569659588
  .07227185068231748
  .07421356838014963
  .07618538148130785
  .07818742180518633
  .08021982031446832
  .0822827071298148
  .08437621154414882
  .08650046203654976
  .08865558628577294
  .09084171118340768
  .09305896284668745
  .0953074666309647
  .09758734714186246
  .09989872824711389
  .10224173308810132
  .10461648409110419
  .10702310297826761
  .10946171077829933
  .1119324278369056
  .11443537382697373
  .11697066775851084
  .11953842798834562
  .12213877222960187
  .12477181756095049
  .12743768043564743
  .1301364766903643
  .13286832155381798
  .13563332965520566
  .13843161503245183
  .14126329114027164
  .14412847085805777
  .14702726649759498
  .14995978981060856
  .15292615199615017
  .1559264637078274
  .1589608350608804
  .162029375639111
  .1651321945016676
  .16826940018969075
  .1714411007328226
  .17464740365558504
  .17788841598362912
  .18116424424986022
  .184474994500441
  .18782077230067787
  .19120168274079138
  .1946178304415758
  .19806931955994886
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  .20507873639031693
  .20863687014525575
  .21223075741405523
  .21586050011389926
  .2195261997292692
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  .23074004852434915
  .23455058216100522
  .238397573812271
  .24228112246555486
  .24620132670783548
  .25015828472995344
  .25415209433082675
  .2581828529215958
  .26225065752969623
  .26635560480286247
  .2704977910130658
  .27467731206038465
  .2788942634768104
  .2831487404299921
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  .29177064981753587
  .2961382707983211
  .3005437944157765
  .3049873140698863
  .30946892281750854
  .31398871337571754
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  .32314320911295075
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  .33245153634617935
  .33716361504833037
  .3419144249086609
  .3467040563550296
  .35153259950043936
  .3564001441459435
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  .3662525955988395
  .3712376804741491
  .3762621229909065
  .38132601143253014
  .386429433787049
  .39157247774972326
  .39675523072562685
  .4019777798321958
  .4072402119017367
  .41254261348390375
  .4178850708481375
  .4232676699860717
  .4286904966139066
  .43415363617474895
  .4396571738409188
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  .45078578283822346
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  .467783796112159
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  .4851499400560704
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  .5028864580325687
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  .7912979403326302
  .799102738014409
  .8069522576692516
  .8148465722161012
  .8227857543962835
  .8307698767746546
  .83879901174074
  .846873231509858
  .8549926081242338
  .8631572134541023
  .8713671191987972
  .8796223968878317
  .8879231178819663
  .8962693533742664
  .9046611743911496
  .9130986517934192
  .9215818562772946
  .9301108583754237
  .938685728457888
  .9473065367331999
  .9559733532492861
  .9646862478944651
  .9734452903984125
  .9822505503331171
  .9911020971138298
  1;

@each $name,
      $value in $sl-colors {

  .sl-background--#{'' + $name} { // to avoid Sass yelling at using 'white' or 'black' as a color name
    background: $value;
  }

  .sl-color--#{'' + $name} { // to avoid Sass yelling at using 'white' or 'black' as a color name
    color: $value;
  }
}

html {
  background: #f8f9fa url("data:image/svg+xml,%3Csvg width='100' height='20' viewBox='0 0 100 20' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M21.184 20c.357-.13.72-.264 1.088-.402l1.768-.661C33.64 15.347 39.647 14 50 14c10.271 0 15.362 1.222 24.629 4.928.955.383 1.869.74 2.75 1.072h6.225c-2.51-.73-5.139-1.691-8.233-2.928C65.888 13.278 60.562 12 50 12c-10.626 0-16.855 1.397-26.66 5.063l-1.767.662c-2.475.923-4.66 1.674-6.724 2.275h6.335zm0-20C13.258 2.892 8.077 4 0 4V2c5.744 0 9.951-.574 14.85-2h6.334zM77.38 0C85.239 2.966 90.502 4 100 4V2c-6.842 0-11.386-.542-16.396-2h-6.225zM0 14c8.44 0 13.718-1.21 22.272-4.402l1.768-.661C33.64 5.347 39.647 4 50 4c10.271 0 15.362 1.222 24.629 4.928C84.112 12.722 89.438 14 100 14v-2c-10.271 0-15.362-1.222-24.629-4.928C65.888 3.278 60.562 2 50 2 39.374 2 33.145 3.397 23.34 7.063l-1.767.662C13.223 10.84 8.163 12 0 12v2z' fill='%23f1f3f5' fill-opacity='0.47' fill-rule='evenodd'/%3E%3C/svg%3E");
}

body {
  background: white;
  color: $sl-color--pale-sky;
}

::selection {
  background: $sl-color--iron;
}

a {
  border-bottom: 1px solid rgba($sl-color--iron, .5);
  color: $sl-color--midnight-blue;

  .c1 & { color: inherit; }

  &:hover,
  &:focus {
    border-bottom-color: rgba($sl-color--iron, .75);
    background: rgba($sl-color--iron, .25);
  }

  &:active { border-bottom-color: $sl-color--iron; }
}

code,
pre {
  border-radius: sl-px-to-em(2px);
  color: darken($sl-color--pale-sky, 25%);

  a & { color: inherit; }
}

pre {
  border: 1px solid #ebebeb;
  background: rgba($sl-color--midnight-blue, .0625);
}