@mixin dark(
  $f1: #ccc,
  $f2: #ddd,
  $c1: #111,
  $c2: #222,
  $c3: #333,
  $c4: #888,
  $a1: #f90,
  $a2: #fb0,
  $a3: #f90,
  $cg: #593,
  $cr: #e33
) {
  #{--f1}: $f1;// Font Color Primary (ccc)
  #{--f2}: $f2;// Font Color Headers (ddd)
  #{--c1}: $c1;// Background Color Primary (111)
  #{--c2}: $c2;// Background Color Secondary (222)
  #{--c3}: $c3;// Table Rows, Block quote edge, Borders (333)
  #{--c4}: $c4;// Disabled Buttons, Borders, mark background (888)
  #{--a1}: $a1;// link color (f90)
  #{--a2}: $a2;// link hover/focus color (fb0)
  #{--a3}: $a3;// link h1-h2 hover/focus color (f90)
  #{--cg}: $cg;// ins green, success (593)
  #{--cr}: $cr;// del red, errors (e33)
}
@mixin light(
  $f1: #333,
  $f2: #222,
  $c1: #fff,
  $c2: #eee,
  $c3: #ddd,
  $c4: #555,
  $a1: #c40,
  $a2: #e60,
  $a3: #f90,
  $cg: #373,
  $cr: #d33
) {
  #{--f1}: $f1;// Font Color Primary (444)
  #{--f2}: $f2;// Font Color Headers (333)
  #{--c1}: $c1;// Background Color Primary (fff)
  #{--c2}: $c2;// Background Color Secondary (eee)
  #{--c3}: $c3;// Table Rows, Block quote edge, Borders (ddd)
  #{--c4}: $c4;// Disabled Buttons, Borders, mark background (677)
  #{--a1}: $a1;// link color (c40)
  #{--a2}: $a2;// link hover/focus color (e60)
  #{--a3}: $a3;// link h1-h2 hover/focus color (f90)
  #{--cg}: $cg;// ins green, success (373)
  #{--cr}: $cr;// del red, errors (d33)
}