nxsass theme map is gettin' cray-cray

_theme.scss

$properties: (
  font: (
    header: ("Josefin Sans", sans-serif), 
    body:   ("Open Sans", sans-serif),
    code:   ("Source Code Pro", sans-serif)
  ),
  color: (
    light:        #8db5e1,
    dark:         #212121,
    theme-text:   hsl(0, 0%, 40%),
    act:          #28AAD0,
    add:          #5CC281,
    invalid:      hsl(345, 75%, 40%),
    valid:        hsl(194, 58%, 74%),
    required:     hsl(345, 75%, 40%)
  ),
  incomm: (
    ic--red:            #cc0033,
    ic--blue:           #6699cc,
    ic--darkgrey:       #333333,
    ic--middarkgrey:    #666666,
    ic--midlightgrey:   #999999,
    ic--lightgrey:      #cccccc,
    ic--superlightgrey: #e7e7e8,
    ic--white:          #ffffff,
    ic--orange:         #DE5A2E,
    ic--yellow:         #DFAC44
  ),
  images: (
    background:   none,
    logo:         none,
    login:        none,
    login-brand:  none,
    hero:         none
  ),
  credit-cards: (
    visa:            #23288F,        
    mastercard:      #CC7404,      
    americanexpress: #1BAA76, 
  ),
  panel: (
    padding: 15px,
    border-radius:2px,
    background: #fff,
    margin-top:5px,
    box-shadow:(hsla(0,0,0,0.09) 0 -3px 0px inset),
    border: (none)
  ),
  container: (
    margin: (0),
    padding: (0 20px),
    background: #efefef
  ),
  button: (
    border-radius: 2px,
    border:(none),
    box-shadow: (hsla(0,0,0,0.09) 0 -3px 0px inset),
    background--act: #6699cc,
    box-shadow--act: (hsla(0,0,0,0.09) 0 -3px 0px inset),
    background--add: #5CC281,
    border--add: none,
    box-shadow--add: (hsla(0,0,0,0.09) 0 -3px 0px inset)
  )   
);

@function nxsass($property, $value) {
    @return map-get(map-get($properties, $property), $value);
}