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[css] easy responsive work

// Extra small screen / phone
// Note: Deprecated @screen-xs and @screen-phone as of v3.0.1
@screen-xs:                  480px;
@screen-xs-min:              @screen-xs;
@screen-phone:               @screen-xs-min;

// Small screen / tablet
// Note: Deprecated @screen-sm and @screen-tablet as of v3.0.1
@screen-sm:                  768px;
@screen-sm-min:              @screen-sm;
@screen-tablet:              @screen-sm-min;

// Medium screen / desktop
// Note: Deprecated @screen-md and @screen-desktop as of v3.0.1
@screen-md:                  992px;
@screen-md-min:              @screen-md;
@screen-desktop:             @screen-md-min;

// Large screen / wide desktop
// Note: Deprecated @screen-lg and @screen-lg-desktop as of v3.0.1
@screen-lg:                  1200px;
@screen-lg-min:              @screen-lg;
@screen-lg-desktop:          @screen-lg-min;

// So media queries don't overlap when required, provide a maximum
@screen-xs-max:              (@screen-sm-min - 1);
@screen-sm-max:              (@screen-md-min - 1);
@screen-md-max:              (@screen-lg-min - 1);


// 1200 ~
@media (min-width: @screen-lg-min) {
}
// 992 ~ (1200-1)
@media (min-width: @screen-md-min) and (max-width: @screen-md-max) {
}
// 768 ~ (992-1)
@media (min-width: @screen-sm-min) and (max-width: @screen-sm-max) {
}
// 480 ~ (768-1)
@media (min-width: @screen-xs-min) and (max-width: @screen-xs-max) {
}
// ~ (480-1)
@media (max-width: (@screen-xs - 1)) {
}


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