anchor.diff:          textarea.textarea-emails(rows=3, placeholder="Enter student emails to invite, one per line")
           div
             button.btn.btn-success.btn-invite Send Invites
  -
         .tab-pane#levels(role='tabpanel')
           +levels-tab
  -    else
  -      .tab-pane.active#levels(role='tabpanel')
  -        +levels-tab
  +
  +mixin progress-tab
  +  if instance.students
  +    h3 Summary
  +    - var averagePlaytime = Math.round(Math.random() * 30) + 30
  +    p
  +      strong(style='font-size:12pt;') Average Play Time
  +    p #{averagePlaytime} minutes
  +    p
  +      strong(style='font-size:12pt;') Concepts Covered
  +    table.table.table-condensed
  +      each concept in courseConcepts
  +        - var conceptCompletion = Math.round(parseFloat(conceptsCompleted[concept]) / instance.students.length * 100)
  +        if isNaN(conceptCompletion)
  +          - conceptCompletion = 0
  +        tr
  +          td.concept-completion-container
  +              span.concept-completed-foreground(data-i18n="concepts." + concept)
  +              span.spl - #{conceptCompletion}%
  +              span.concept-completion-background(style="width:#{conceptCompletion}%;")
  +    h3 Students
  +    table.table.table-condensed
  +      thead
  +        tr
  +          th
  +            span.member-header.spr Name
  +            if memberSort === 'nameAsc'
  +              span.member-header.glyphicon.glyphicon-chevron-up
  +            else if memberSort === 'nameDesc'
  +              span.member-header.glyphicon.glyphicon-chevron-down
  +          th
  +            span.progress-header.spr Progress
  +            if memberSort === 'progressAsc'
  +              span.progress-header.glyphicon.glyphicon-chevron-up
  +            else if memberSort === 'progressDesc'
  +              span.progress-header.glyphicon.glyphicon-chevron-down
  +            else
  +              span(style='padding-left:16px;')
  +            span.progress-key.progress-key-complete complete
  +            span.progress-key.progress-key-started started
  +            span.progress-key not started
  +            if maxLastStartedIndex > 30
  +              input.expand-progress-checkbox(type='checkbox')
  +              span.spl.expand-progress-label(data-i18n="clans.exp_levels") Expand levels
  +      tbody
  +        each student in instance.students
  +          tr
  +            td
  +              a= student
  +            td.progress-cell
  +              .level-progression-concepts Concepts
  +              each concept in courseConcepts
  +                if userConceptsMap[student] && userConceptsMap[student][concept] === 'complete'
  +                  span.spr.progress-concept-cell.progress-concept-cell-complete(data-i18n="concepts." + concept)
  +                else if userConceptsMap[student] && userConceptsMap[student][concept] === 'started'
  +                  span.spr.progress-concept-cell.progress-concept-cell-started(data-i18n="concepts." + concept)
  +                else
  +                  span.spr.progress-concept-cell.progress-concept-cell-not-started(data-i18n="concepts." + concept)
  +
  +              .level-progression-levels Levels
  +              - var i = 0
  +              each level in course.levels
  +                if userLevelStateMap[student][level] === 'complete'
  +                  span.progress-level-cell.progress-level-cell-complete #{i + 1}
  +                    if showExpandedProgress || i === 0 || i === course.levels.length - 1
  +                      span.spl #{level}
  +                    .level-popup-container
  +                      h3 #{i + 1}. #{level}
  +                      p
  +                        div
  +                          - var playTime = Math.round(Math.random() * 600)
  +                          span Time to solve
  +                          span : #{playTime} seconds
  +                        div
  +                          - var completionDate = new Date()
  +                          - completionDate.setUTCDate(completionDate.getUTCDate() - Math.round(Math.random() * 60))
  +                          span Completed on
  +                          span : #{moment(completionDate).format('MMMM Do YYYY, h:mm:ss a')}
  +                      strong(data-i18n="clans.view_solution") Click to view solution.
  +                else if userLevelStateMap[student][level] === 'started'
  +                  span.progress-level-cell.progress-level-cell-started #{i + 1} #{level}
  +                else
  +                  span.progress-level-cell.level-progression-level-not-started #{i + 1}
  +                    if showExpandedProgress || i === 0
  +                      span.spl #{level}
  +                - i++
   
   mixin levels-tab
     table.table.table-striped.table-condensed
  
positive.code:   //- DO NOT localize / i18n
  
    div TODO: fix ugly tabs
    div TODO: not enrolled yet
    div
      span *UNDER CONSTRUCTION, send feedback to
      a.spl(href='mailto:team@codecombat.com') team@codecombat.com
  
negative.code: 
    div(role='tabpanel')
      ul.nav.nav-tabs(role='tablist')
        if studentMode
          li.active(role='presentation')
            a(href='#levels', aria-controls='levels', role='tab', data-toggle='tab') Levels
          li(role='presentation')
            a(href='#progress', aria-controls='progress', role='tab', data-toggle='tab') Class
        else
          li.active(role='presentation')
            a(href='#progress', aria-controls='progress', role='tab', data-toggle='tab') Class
          li(role='presentation')
            a(href='#invite', aria-controls='invite', role='tab', data-toggle='tab') Add Students
          li(role='presentation')
            a(href='#levels', aria-controls='levels', role='tab', data-toggle='tab') Levels
  
    .tab-content
      if studentMode
        .tab-pane.active#levels(role='tabpanel')
          +levels-tab
        .tab-pane#progress(role='tabpanel')
          +progress-tab
      else
        .tab-pane.active#progress(role='tabpanel')
          +progress-tab
        .tab-pane#invite(role='tabpanel')
          p Invite students to join this class.
          if course.title !== 'Introduction to Computer Science'
  