    /**
     * @class Ext.form.FieldSet
     */

    /**
     * @var {number}
     * The font-size of the FieldSet header
     */
    $fieldset-header-font-size: ceil($font-size * .9) !default;

    /**
     * @var {string}
     * The font-weight of the FieldSet header
     */
    $fieldset-header-font-weight: normal !default;

    /**
     * @var {string}
     * The font-family of the FieldSet header
     */
    $fieldset-header-font-family: $font-family !default;

    /**
     * @var {number/string}
     * The line-height of the FieldSet header
     */
    $fieldset-header-line-height: 14px !default;

    // private
    $fieldset-header-font: $fieldset-header-font-weight #{$fieldset-header-font-size}/#{$fieldset-header-line-height} $fieldset-header-font-family !default;

    /**
     * @var {color}
     * The text color of the FieldSet header
     */
    $fieldset-header-color: adjust-color($base-color, $hue: 3.785deg, $saturation: 18.194%, $lightness: -52.745%) !default;

    /**
     * @var {number}
     * The border-width of the FieldSet
     */
    $fieldset-border-width: 1px !default;

    /**
     * @var {string}
     * The border-style of the FieldSet
     */
    $fieldset-border-style: solid !default;

    /**
     * @var {color}
     * The border-color of the FieldSet
     */
    $fieldset-border-color: #B5B8C8 !default;

    // private
    $fieldset-border: $fieldset-border-width $fieldset-border-style $fieldset-border-color !default;

    /**
     * @var {number/list}
     * The FieldSet's padding
     */
    $fieldset-padding: 0 10px !default;

    /**
     * @var {number/list}
     * The FieldSet's margin
     */
    $fieldset-margin: 0 0 10px !default;

    /**
     * @var {number/list}
     * The padding to apply to the FieldSet's header
     */
    $fieldset-header-padding: 0 3px 1px !default;

    /**
     * @var {number/list}
     * The margin to apply to the FieldSet's collapse tool
     */
    $fieldset-collapse-tool-margin: 1px 3px 0 0 !default;

    /**
     * @var {number/list}
     * The padding to apply to the FieldSet's collapse tool
     */
    $fieldset-collapse-tool-padding: 0 !default;

    /**
     * @var {number/list}
     * The margin to apply to the FieldSet's checkbox (for FieldSets that use
     * {@link #checkboxToggle})
     */
    $fieldset-checkbox-margin: $fieldset-collapse-tool-margin !default;

    /**
     * @var {number}
     * The size of the FieldSet's collapse tool
     */
    $fieldset-collapse-tool-size: 15px !default;

    /**
     * @var {string} $fieldset-collapse-tool-background-image
     * The background-image to use for the collapse tool. If null the default tool
     * sprite will be used.  Defaults to null.
     */
    $fieldset-collapse-tool-background-image: 'none' !default;

    // private
    $fieldset-collapse-tool-background-position: 0 ($fieldset-collapse-tool-size * -4) !default;

    // private
    $fieldset-collapse-tool-background-position-over: (-$fieldset-collapse-tool-size) ($fieldset-collapse-tool-size * -4) !default;

    // private
    $fieldset-collapse-tool-background-position-collapsed: 0 ($fieldset-collapse-tool-size * -5) !default;

    // private
    $fieldset-collapse-tool-background-position-collapsed-over: (-$fieldset-collapse-tool-size) ($fieldset-collapse-tool-size * -5) !default;