* {
  box-sizing: border-box;
  text-rendering: optimizeLegibility;
}

html, body {
    height: 100%;
    background: @background;
    color: @foreground;
}

body {
  margin: 0;
  padding: 0;
  font-family:
    "Segoe UI", //windows
    "Lucida Sans", //os x
    "Droid Sans", //ubuntu?
    "Liberation Sans", //other linux?
    sans-serif; //fallback
  display: flex;
  flex-direction: column;
  align-items: stretch;
  align-content: stretch;
}

a[target] {
  color: @foreground;
}

:focus {
  outline: @accent auto 5px;
}

//MACRO-LEVEL POSITIONING

.titlebar {
  flex: 0 0 30px;
  z-index: 999;
}

.tabs {
  flex: 0 0 32px;
}

.central {
  display: flex;
  flex-grow: 1;
  align-items: stretch;
  align-content: stretch;
}

.editing {
  display: flex;
  flex-grow: 1;
  align-items: stretch;
  align-content: stretch;
  flex-direction: column;
}

#editor {
  flex-grow: 1;
  padding-top: 2px;
  z-index: 9;
}

.bottom-bar {
  flex: 0 0 auto;
  align-self: flex-end;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-content: stretch;
  box-shadow: 0 -4px 4px rgba(0, 0, 0, .1);
  z-index: 99;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
}

//immersive mode

.immersive {
  .titlebar, .bottom-bar {
    display: none;
  }
  
  .central {
    margin-top: 5px;
  }
  
  .tabs {
    height: 6px;
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    overflow: hidden;
    transition: height .3s ease;
    align-items: stretch;
    align-content: stretch;
    z-index: 999;
    
    .tab {
      overflow: hidden;
    }
    
    &:hover {
      height: 34px;
    }
  }
}