stylus usage demo

gistfile1.txt

$title-color
  color red
.a
  @extends $title-color

.title-color2
  color red

.b
  @extends .title-color2

title-color3()
  color red

.c
  title-color3()
  
box-shadow()
  -webkit-box-shadow arguments
  -moz-box-shadow arguments
  box-shadow arguments

body
  box-shadow #ddd 1px 1px, #eee 2px 2px