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HTML 

              
                %header.masthead
  .brand-container
    %a{:href => "#"}
      %span.brand-initials Es
      %span.brand-name Elemental Shift
  %nav
    .nav-container
      %div
        %input#slider1{:name => "slider1", :type => "checkbox"}/
        %label.slide.has-child{:for => "slider1"}
          %span.element Bg
          %span.name Blog
        .child-menu
          %a{:href => "#"} Recent
          %a{:href => "#"} Archives
          %a{:href => "#"} Categories
      %div
        %a.slide{:href => "#"}
          %span.element Po
          %span.name Portfolio
      %div
        %input#slider2{:name => "slider2", :type => "checkbox"}/
        %label.slide.has-child{:for => "slider2"}
          %span.element Xp
          %span.name Laboratory
        .child-menu
          %a{:href => "#"} PHP
          %a{:href => "#"} Javascript
          %a{:href => "#"} Css
          %a{:href => "#"} Ruby
          %a{:href => "#"} Python
          %a{:href => "#"} Design
      %div
        %a.slide{:href => "#"}
          %span.element Ab
          %span.name About
      %div
        %a.slide{:href => "#"}
          %span.element C
          %span.name Contact
  .social-container
    %span
      %a.social-roll.github{:href => "#"}
    %span
      %a.social-roll.twitter{:href => "#"}
    %span
      %a.social-roll.linkedin{:href => "#"}
    %span
      %a.social-roll.rss{:href => "#"}
!

CSS 

              
                @import compass

@function emCalc($pxWidth)
    @return $pxWidth / 16 * 1em

@mixin breakpoint($break)
    @if $break == small
        @media only screen and (min-width: emCalc(769))
            @content
a
    text-decoration: none

$colors: #8cc63f, #ef3724, #ffa61a, #1ab1ff, #FC1DCF
nav
    display: table
    position: relative
    table-layout: fixed
    width: 100%

    // hide and reset form elemetns for dropdowns
    input
        display: none
    label
        margin: 0

    div.nav-container
        display: table-row
        & > div
            display: table-cell

        // loop through colors list and generate rules on a
        // per color basis
        @for $i from 1 through length($colors)
            & > div:nth-of-type(#{length($colors)}n+#{$i})
                // apply coloring to menu elements and nested links
                & .slide, & a
                    border-color: nth($colors, $i)
                    &:hover
                        color: darken( nth($colors, $i), 20)
                    // set background color for child menus
                    & ~ .child-menu
                        background-color: lighten( nth($colors, $i), 10)
                // set colors for color for active elements
                & input:checked, .slide.active
                    & ~ label
                        color:  nth($colors, $i)


    // set base transition spees for all a and label elements in the menu
    a, label
        // all a elements
        +transition-property(color)
        +transition-duration(.2s)
        +transition-timing-function(ease-in)

    // base styling for the sliding elements
    .slide
        padding: 10px 10px
        font-size: emCalc(16)
        display: block
        color: #393939
        border-top: 4px solid transparent
        position: relative
        // a.slide elements change border width on mouse out
        +transition-property(border-width, color)
        +transition-duration(.1s, .2s)
        +transition-timing-function(ease-in)
        +transition-delay(.2s, 0s)
        .element
            font-size: emCalc(20)
            font-weight: 600
            font-style: normal
            display: block
            line-height: 1
        .name
            font-size: emCalc(11)
            position: relative

    .has-child .name:after
        content: ""
        width: 10px
        height: 4px
        background-image: url('http://www.elemental-shift.com/remote-assets/down-arrow.svg')
        display: block
        position: absolute
        bottom: -9px
        left: 1px
        background-repeat: no-repeat
        +transition-property(transform)
        +transition-duration(.5s)
        +transition-timing-function(ease-in)
        +transform-origin(50%, 50%)
        
        
    // child menu styling
    .child-menu
        display: block
        position: absolute
        max-height: 0
        overflow: hidden
        background-color: #393939
        width: 100%
        top: 65px
        left: 0
        z-index: 5000
        // mouse out timing functions
        +transition-property(max-height)
        +transition-duration(.5s)
        +transition-timing-function(ease-in)
        a
            color: white
            display: inline-block
            padding: 15px 30px 15px 10px
            font-size: emCalc(15)

    // hold open child menu when input is checked
    input:checked ~ .child-menu
        max-height: 100px
        // mouse in time functions
        +transition-property(max-height)
        +transition-duration(.5s)
        +transition-timing-function(ease-in)
    input:checked ~ .has-child .name:after
        +rotateX(180deg)

+breakpoint(small)
    nav
        display: block
        table-layout: auto

        div.nav-container
            display: block
            & > div
                display: block
                margin: 5px 0
                &:hover .slide
                    border-left-width: 55px
                    // a.slide transition delay on hover
                    +transition-delay(0)

        .slide
            display: block
            width: auto
            border-left: solid 4px #393939
            border-top: none
            .element
                line-height: 1

        .child-menu
            display: block
            position: relative
            top: 0
            background-color: transparent !important
            margin-left: 55px
            width: auto
            max-height: 0px
            overflow: hidden
            border-top: none
            a
                color: #393939
                display: block
                padding: 3px 0 3px 10px
                font-size: emCalc(13)

        input:checked ~ div.child-menu
            max-height: 120px

        input:checked ~ .slide
            border-width: 55px

.masthead
    font-family: "Open Sans", sans-serif
    .brand-container
        padding: 10px
        background-color: #393939
        a
            color: white
            display: inline-block
            +transition-property(all)
            +transition-duration(.2s)
            +transition-timing-function(ease-in)
            &:hover
                color: #8cc63f
    .brand-initials
        font-size: emCalc(49)
        font-weight: 700
        font-style: normal
        display: block
        line-height: 42px
    .brand-name
        font-size: emCalc(13)
        text-indent: 3px
        display: block

+breakpoint(small)
    .masthead
        position: absolute
        top: 0
        left: 0
        width: 150px
        .brand-container
            padding: 10px 0 50px 10px
            a
                display: block
!

JS 

              
                # Pure Css responsive menu with dropdowns and
# transition effects
!
999px

Console