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HTML 

              
                //- Nav Items
- var navItems = { home: 'Home', my_trip: 'My Trip', discover_places: 'Discover Places', notifications: 'Notifications', settings: 'Settings' }

//- Trips
- var trips = { kulon_progo: 'Kulon Progo', bromo: 'Bromo' }

//- Bromo Trip
- var bromo = { title: 'Investors Meetup - Bromo', date: '15 May - 23 May 2016', temp: '21' }
- var bromoTasks = ['Prepare the Sound Recorder', 'Book a resturant', 'Book 24 hotel rooms']

//- Kulon Progo Trip
- var kulon_progo = { title: 'Team holiday Trip to The Jewel of Java, Kulon Progo', date: '15 May - 23 May 2016', temp: '34' }
- var kulon_progoTasks = ['Book tickets', 'Get passports ready', 'Book hotel rooms']


// Dashboard (Parent Block)
.dashboard

  // Dashboard Sidebar (Block)
  .dashboard-sidebar
  
    // Brand (Element)
    .dashboard-sidebar__brand
      img(src='https://s3-us-west-2.amazonaws.com/s.cdpn.io/169963/planner_dashboard_logo.svg')
    
    // Dashboard Nav (Block)
    .dashboard-nav: ul
      each name, val in navItems
        if name == 'My Trip'
          // Item:Selected (Element:Modifier)        
          li.dashboard-nav__item.dashboard-nav__item--selected: a(href=val)
            img(src='https://s3-us-west-2.amazonaws.com/s.cdpn.io/169963/planner_dashboard_' + val + '.svg')
            =name

        else
          // Item (Element)
          li.dashboard-nav__item: a(href=val)
            img(src='https://s3-us-west-2.amazonaws.com/s.cdpn.io/169963/planner_dashboard_' + val + '.svg')
            =name 

  // Dashboard Content (Block)
  .dashboard-content

    // Dashboard Header (Block)
    .dashboard-header
    
      // Search (Element)
      .dashboard-header__search
        input(type='search'
              placeholder='Search...')
      
      // New (Element)
      .dashboard-header__new
        img(src='https://s3-us-west-2.amazonaws.com/s.cdpn.io/169963/planner_dashboard_new_plan.svg')
        
    each name, val in navItems
      if name == 'My Trip'
        // Dashboard Content Panel (Element)
        .dashboard-content__panel.dashboard-content__panel--active(data-panel-id=val)

          // Dashboard List (Block) 
          .dashboard-list
            each name, val in trips
                  
              if val == 'kulon_progo'
                // Dasboard List Item (Element)
                .dashboard-list__item(data-item-id=val)
                  // Title (Element)
                  h2=kulon_progo.title
                  
                  // Date (Element)
                  span=kulon_progo.date
                  
                  - var totalAvatars = Math.floor((Math.random() * 7) + 1);
                  - var n = 0

                  while n < totalAvatars
                    // Avatar (Element)
                    .dashboard-list__avatar
                      img(src='http://placehold.it/31/95BFBF/FFF'
                          data-avatar-id=n++)
            
              else if val == 'bromo'
                // Dasboard List Item (Element)
                .dashboard-list__item.dashboard-list__item--active(data-item-id=val)
                  // Title (Element)
                  h2=bromo.title

                  // Date (Element)
                  span=bromo.date
                  
                  - var totalAvatars = Math.floor((Math.random() * 5) + 1);
                  - var n = 0

                  while n < totalAvatars
                    // Avatar (Element)
                    .dashboard-list__avatar
                      img(src='http://placehold.it/31/95BFBF/FFF'
                          data-avatar-id=n++)
                  
              else
                // Dasboard List Item (Element)
                .dashboard-list__item(data-item-id=val)
                
                  // Title (Element)
                  h2 Null
                  
                  // Date (Element)
                  span Null
                  
                  - var totalAvatars = Math.floor((Math.random() * 5) + 1);
                  - var n = 0

                  while n < totalAvatars
                    // Avatar (Element)
                    .dashboard-list__avatar
                      img(src='http://placehold.it/31/95BFBF/FFF'
                          data-avatar-id=n++)
      
      else
        // Dashboard Content Panel (Element)
        .dashboard-content__panel(data-panel-id=val)
          p=name
    
  // Dashboard Preview (Block)  
  .dashboard-preview
    each name, val in trips
    
      // Panel (Element)
      .dashboard-preview__panel(class=name == 'Bromo' ? 'dashboard-preview__panel--active' : ''
                                data-panel-id=val)
                                
        // Header (Element)
        .dashboard-preview__header
          h2=name
          h3
            if name == 'Bromo'
              =bromo.temp
              span C
            else if name == 'Kulon Progo'
              = kulon_progo.temp
              span C
                                
        // Content (Element)
        .dashboard-preview__content
          section
            h2 My Tasks
            
            if name == 'Bromo'
              each name in bromoTasks
                label
                  input(type='checkbox')
                  span=name
                  
            else if name == 'Kulon Progo'
              each name in kulon_progoTasks
                label
                  input(type='checkbox')
                  span=name
            else
              p All task complete
            
          section
            - var totalUnread = Math.floor((Math.random() * 100) + 1);
            h2 Discussion 
              span (#{totalUnread} unread)
            
          section
            - var randomDay = Math.floor((Math.random() * 10) + 1);
            h2 Progress 
              span (Day #{randomDay} of 10)

            - var percetange = Math.floor((Math.random() * 100) + 1);
            
            .progress-bar
              .progress-bar__bar(style='width: #{percetange}%')
              .progress-bar__badge(style='left: #{percetange}%')=percetange + '%'
!

CSS 

              
                // Fonts
$body-font: 'Open Sans';
$header-font: $body-font;

// Font Weights
$light: 300;
$regular: 400;
$semibold: 600;
$bold: 700;
$ultra: 800;

// Colors
$white: #FFF;
$black: #000;
$text-primary: #5F6876;
$text-secondary: #C0C3C9;

// PX to REM Function
$default-browser-font-size: 16;

@function rem($pixels, $context: $default-browser-font-size) {
  @if unitless($pixels) {
    $pixels: $pixels * 1px;
  }

  @if unitless($context) {
    $context: $context * 1px;
  }

  @return $pixels / $context * 1rem;
}

// Base
$base-background: linear-gradient(45deg, #F4EBE5, #E3D4CA);
$base-font-color: $text-secondary;
$base-font-family: $body-font;
$base-font-size: rem(12);
$base-font-weight: $regular;
$base-line-height: rem(14);

// Dashboard
$dashboard-background: $white;
$dashboard-width: rem(1024);
$dashboard-height: rem(680);
$dashboard-border-color: #F2F2F2;
$dashboard-border-radius: rem(7);
$dashboard-box-shadow: rem(22) rem(32) rem(34) rgba($black, 0.06);

html {
  width: 100%;
  height: 100%;
}

body {
  background: $base-background;
  color: $base-font-color;
  font-family: $base-font-family;
  font-size: $base-font-size;
  font-weight: $base-font-weight;
  line-height: $base-line-height;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

// Dashboard
.dashboard {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  background: $dashboard-background;
  width: $dashboard-width;
  height: $dashboard-height;
  border-radius: $dashboard-border-radius;
  box-shadow: $dashboard-box-shadow;
  overflow: hidden;
  
  // Dashboard Sidebar (Block)
  &-sidebar {
    flex-basis: rem(225);
    width: rem(225);
    min-width: rem(225);
    border-right: rem(1) solid $dashboard-border-color;

    // Brand (Element)
    &__brand {
      margin: 0 0 rem(23);
      padding: rem(23) rem(26);
    }
  }
    
  // Dashboard Nav (Block)
  &-nav {
    
    // Item (Element)
    &__item {
      background: 0;

      // Link (Element)
      a {
        display: block;
        padding: rem(21) rem(36);
        color: inherit;
        text-decoration: none;
        
        // Image (Element)
        img {
          margin: 0 rem(24) 0 0;
        }
      }
      
      // Selected (Modifier)
      &--selected {
        background: #F5F7F7;
        color: $text-primary;
      }
    }
  }
  
  // Dashboard Content (Block)
  &-content {
    width: 100%;
    border-right: rem(1) solid $dashboard-border-color;
    
  // Dashboard Panel (Element)
    &__panel {
      display: none;
      
      &--active {
        display: block;
      }
    }
  }
  
  // Dashboard Panel (Block)
  &-list {
    
    // Item (Element)
    &__item {
      padding: rem(33) rem(41);
      border-bottom: rem(1) solid $dashboard-border-color;
      cursor: pointer;
      
      h2 {
        margin: 0 0 rem(27);
        color: $text-primary;
        letter-spacing: rem(2.4);
      }
      
      span {
        display: block;
        margin: 0 0 rem(24);
        font-size: rem(10);
        letter-spacing: rem(2.18);
      }
      
      // Active (Modifier)
      &--active {
        background: #F5F7F7;
      }
    }

    // Avatar (Element)
    &__avatar {
      display: inline-block;
      max-width: rem(31);
      max-height: rem(31);
      border-radius: 100%;
      overflow: hidden;
      margin: 0 rem(11) 0 0;
    }
  }
  
  // Dashboard Header (Block)
  &-header {
    display: flex;
    flex-direction: row;
    width: 100%;
    max-height: rem(59);
    border-bottom: rem(1) solid $dashboard-border-color;
    
    &__search {
      width: 100%;
      height: 100%;
      border-right: rem(1) solid $dashboard-border-color;
      
      input {
        outline: none;
        display: block;
        width: 100%;
        padding: 23px;
        border: 0;
        letter-spacing: rem(2);
      }
    }
    
    &__new {
      min-width: rem(60);
      padding: 23px;
      box-sizing: border-box;
      cursor: pointer;
    }
  }
  
  // Dashboard Preview (Block)
  &-preview {
    background: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/169963/planner_dashboard_background.jpg') no-repeat;
    background-size: cover;
    width: 100%;
    height: 100%;
    
    // Panel (Element)
    &__panel {
      display: none;
      
      &--active {
        display: block;
      }
    }
    
    // Header (Element)
    &__header {
      margin: 0 0 rem(152);
      padding: rem(27) rem(29);
      color: $white;

      h2 {
        font-size: rem(14);
        line-height: rem(17);
      }
      
      h3 {
        font-size: rem(36);
        line-height: rem(46);
        
        span {
          font-size: rem(16);
          line-height: rem(36);
          vertical-align: top;
        }
      }
    }
    
    // Content (Element)
    &__content {
      padding: 0 rem(44);
      
      section {
        padding: rem(33) 0;
        border-bottom: 1px solid $dashboard-border-color;
        
        &:last-child {
          border: 0;
        }
      }
      
      h2 {
        color: $text-primary;
        letter-spacing: rem(2.2);
        
        span {
          color: $text-secondary;
          font-size: rem(10);
        }
      }
      
      label {
        display: block;
        margin: rem(17) 0 0 0;
        color: $text-primary;
        
        &:first-child {
          margin: rem(40) 0 0 0;
        }
        
        input {
          margin: 0 rem(23) 0 0;
          
          &:checked {
            ~ span {
              color: $text-secondary;
              text-decoration: line-through;
            }
          }
        }
      }
    }
  }
}

.progress-bar {
  position: relative;
  background: #EDEBEA;
  height: rem(5);
  border-radius: rem(100);
  margin: rem(46) 0 0 0;
  
  &__bar {
    background: #8FC6C3;
    height: 100%;
    border-radius: rem(100);
  }
  
  &__badge {
    position: absolute;
    top: 0;
    left: 0;
    background: #A7DEDB;
    border-radius: rem(100);
    box-shadow: rem(2) rem(4) rem(12) rgba(#A7DEDB, 0.56);
    padding: rem(6) rem(8);
    color: $white;
    font-size: rem(10);
    line-height: rem(12);
    transform: translate(-50%, -50%);
  }
}

// Demo
.dashboard {
  position: absolute;
  left: 50%;
  margin: 100px;
  transform: translate(-50%, 0%);
}
!

JS 

              
                $('.dashboard-nav__item').on 'click', (e) ->
  e.preventDefault()
  
  $('.dashboard-nav__item').removeClass 'dashboard-nav__item--selected'
  $(this).addClass 'dashboard-nav__item--selected'
  
  itemId = $(this).children().attr 'href'
    
  $('.dashboard-content__panel').hide()
  $('.dashboard-content__panel[data-panel-id=' + itemId + ']').show()
  
  if itemId == 'my_trip'
    $('.dashboard-preview').show()
  else
    $('.dashboard-preview').hide()
  
  console.log(itemId)
  
$('.dashboard-list__item').on 'click', (e) ->
  e.preventDefault()
  
  $('.dashboard-list__item').removeClass 'dashboard-list__item--active'
  $(this).addClass 'dashboard-list__item--active'
  
  itemId = $(this).attr 'data-item-id'
  
  $('.dashboard-preview__panel').hide()
  $('.dashboard-preview__panel[data-panel-id=' + itemId + ']').show()
  
  console.log(itemId)
!
999px

Console