// Color variables (appears count calculates by raw css)
@color0: #e1e1e1; // Appears 3 times
@color1: #000000; // Appears 4 times
@color2: #cccccc; // Appears 3 times
@color3: #777777; // Appears 2 times

@color4: #ffffff; // Appears 1 time
@color5: #555555; // Appears 1 time
@color6: #452500; // Appears 1 time
@color7: #fafafa; // Appears 1 time
@color8: #999999; // Appears 1 time
@color9: #bbbbbb; // Appears 1 time
@color10: #888888; // Appears 1 time
@color11: #f4f4f4; // Appears 1 time

// ".lm_dragging" is applied to BODY tag during Drag and is also directly applied to the root of the object being dragged

// Entire GoldenLayout Container, if a background is set, it is visible as color of "pane header" and "splitters" (if these latest has opacity very low)
.lm_goldenlayout {
  background:@color11;
}

// Single Pane content (area in which final dragged content is contained)
.lm_content {
  background: @color0;
  border: 1px solid @color2;
}

// Single Pane content during Drag (style of moving window following mouse)
.lm_dragProxy {
  .lm_content {
    box-shadow: 2px 2px 4px fade(@color1,20%);
  }
}

// Placeholder Container of target position
.lm_dropTargetIndicator {
  box-shadow: inset 0 0 30px fade(@color1,40%);
  outline: 1px dashed @color2;

  // Inner Placeholder
  .lm_inner {
    background: @color1;
    opacity: 0.1;
  }
}

// Separator line (handle to change pane size)
.lm_splitter {
  background: @color8;
  opacity: 0.001;
  transition: opacity 200ms ease;

  &:hover, // When hovered by mouse...
  &.lm_dragging {
    background: @color9;
    opacity: 1;
  }
}

// Pane Header (container of Tabs for each pane)
.lm_header {
  height: 20px;

  // Single Tab container. A single Tab is set for each pane, a group of Tabs are contained in ".lm_header"
  .lm_tab {
    font-family: Arial, sans-serif;
    font-size: 12px;
    color: @color10;
    background: @color7;
    margin-right: 2px;
    padding-bottom: 4px;
    border: 1px solid @color2;
    border-bottom: none;

    .lm_title {
      padding-top: 1px;
    }

    // Close Tab Icon
    .lm_close_tab {
      width: 11px;
      height: 11px;
      background-image: data-uri('../img/lm_close_black.png');
      background-position: center center;
      background-repeat: no-repeat;
      top: 4px;
      right: 6px;
      opacity: 0.4;

      &:hover {
        opacity: 1;
      }
    }

    // If Tab is active, so if it's in foreground
    &.lm_active {
      border-bottom: none;
      box-shadow: 2px -2px 2px -2px fade(@color1,20%);
      padding-bottom: 5px;

      .lm_close_tab {
        opacity: 1;
      }
    }
  }
}

.lm_dragProxy,
.lm_stack {
  &.lm_right {
    .lm_header .lm_tab {
      &.lm_active {
        box-shadow: 2px -2px 2px -2px fade(@color1,20%);
      }
    }  
  }
  
  &.lm_bottom {
    .lm_header .lm_tab {
      &.lm_active {
        box-shadow: 2px 2px 2px -2px fade(@color1,20%);
      }
    }
  } 
}

// If Pane Header (container of Tabs for each pane) is selected (used only if addition of new Contents is made "by selection" and not "by drag")
.lm_selected {
  .lm_header {
    background-color: @color6;
  }
}

.lm_tab {
  &:hover, // If Tab is hovered
  &.lm_active // If Tab is active, so if it's in foreground
  {
    background: @color0;
    color: @color3;
  }
}

// Dropdown arrow for additional tabs when too many to be displayed
.lm_header .lm_controls .lm_tabdropdown:before {
  color: @color1;
}

// Pane controls (popout, maximize, minimize, close)
.lm_controls {
  // All Pane controls shares these
  > li {
    position: relative;
    background-position: center center;
    background-repeat: no-repeat;
    opacity: 0.4;
    transition: opacity 300ms ease;

    &:hover {
      opacity: 1;
    }
  }

  // Icon to PopOut Pane, so move it to a different Browser Window
  .lm_popout {
    background-image: data-uri('../img/lm_popout_black.png');
  }

  // Icon to Maximize Pane, so it will fill the entire GoldenLayout Container
  .lm_maximise {
    background-image: data-uri('../img/lm_maximise_black.png');
  }

  // Icon to Close Pane and so remove it from GoldenLayout Container
  .lm_close {
    background-image: data-uri('../img/lm_close_black.png');
  }

  // Icon to toggle Pane Docking at mouse hover
  .lm_dock {
    background-image: data-uri('../img/lm_docked_black.png');
    transform:rotate(-45deg);
    transition:transform 300ms;
  }
}

.lm_stack.lm_docked {
  .lm_controls .lm_dock {
    transform:rotate(0deg);
  }

  > .lm_items {
    border-color: @color9;
    border-image: linear-gradient(to right, @color9 1%, @color4 100%);
    box-shadow: 2px 2px 2px -2px fade(@color1,20%);
  }
}

// If a specific Pane is maximized
.lm_maximised {
  // Pane Header (container of Tabs for each pane) can have different style when is Maximized
  .lm_header {
    background-color: @color4;
  }

  // Pane controls are different in Maximized Mode, especially the old Icon "Maximise" that now has a different meaning, so "Minimize" (even if CSS Class did not change)
  .lm_controls {
    .lm_maximise {
      background-image: data-uri('../img/lm_minimize_black.png');
    }
  }
}

.lm_transition_indicator {
  background-color: @color1;
  border: 1px dashed @color5;
}

// If a specific Pane is Popped Out, so move it to a different Browser Window, Icon to restore original position is:
.lm_popin {
  cursor: pointer;

  // Background of Icon
  .lm_bg {
    background: @color1;
    opacity: 0.7;
  }

  // Icon to Restore original position in Golden Layout Container
  .lm_icon {
    background-image: data-uri('../img/lm_popin_black.png');
    background-position: center center;
    background-repeat: no-repeat;
    opacity: 0.7;
  }

  &:hover {
    .lm_icon {
      opacity: 1;
    }
  }
}