/* 定义全站基础样式，以方便其他模块扩展 */
@import "variables"
$link_purple
  color: purple
  text-decoration: none
  &:hover
    color: white
    background-color: purple

$link_hover_red
  &:hover
  	color: red
  	text-decoration: underline

float_grid(width, margin , col)
	width: (width+margin) * col - margin
	ul
		clearfix()
		width: @width + margin
		li
			width: width
			float: left
			margin-right: margin
			margin-bottom: margin