CSS less优化

#header {
  color: #4D926F;
}

h2 {
  color: #4D926F;
}

@brand_color: #4D926F;

#header {
  color: @brand_color;
}

h2 {
  color: @brand_color;
}

#header {
  -moz-border-radius: 8px;
  -webkit-border-radius: 8px;
  border-radius: 8px;
}

#footer {
  -moz-border-radius: 8px;
  -webkit-border-radius: 8px;
  border-radius: 8px;
}

.rounded_corners {
  -moz-border-radius: 8px;
  -webkit-border-radius: 8px;
  border-radius: 8px;
}

#header {
  .rounded_corners;
}

#footer {
  .rounded_corners;
}

#header {
  color: red;
}

#header a {
  font-weight: bold;
  text-decoration: none;
}

#header {
  color: red;
  a {
    font-weight: bold;
    text-decoration: none;
  }
}

#header {
  color: #333;
  border-left: 1px;
  border-right: 2px;
}

#footer {
  color: #222;
}

@the-border: 1px;
@base-color: #111;

#header {
  color: @base-color * 3;
  border-left: @the-border;
  border-right: @the-border * 2;
}

#footer {
  color: @base-color + #111;
}