header {
  box-sizing: border-box;
  background: #000;
  color: #fff;
  padding: 5px 5px 5px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  position: fixed;
  width: 100%;
  margin-bottom: 0px;
  border-bottom: solid 1px #ccc;
}
header:after {
  content: "";
  display: table;
  clear: both;
}
header a, header a:link, header a:visited {
  color: #333;
  text-decoration: none;
}
header .logo {
  position: relative;
  z-index: 123;
  padding: 5px;
  font: 0px verdana;
  color: #6DDB07;
  float: left;
  width: 280px;
  margin: 0 0 0 0;
}
header .logo a {
  font-weight: normal;
  font-size: 20px;
  height: 40px;
  width: 280px;
  background: url("../_img/nist_logo.png") no-repeat;
  background-size: 280px auto;
  text-indent: -9999px;
  overflow: hidden;
  display: inline-block;
}
header #topnav {
  position: relative;
  /* width: 980px;*/
  /* margin: 0 auto;*/
  padding-left: 0px;
  font-family: sans-serif;
  background: #000;
}

header h1#top_title {
  font-size: 2.78em;
  font-weight: normal;
  padding: 5px 0px;
  display: inline-block;  
  margin-left: 10%;
  margin-right: auto;
}

header h1#top_title::after {
  content: " (SRD-130)";
}


header #topnav, header #topnav ul li, header #topnav ul li a, header #topnav #head-mobile {
  border: 0;
  list-style: none;
  line-height: 1;
  display: block;
  position: relative;
  /*-webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;  no longer needed */
  box-sizing: border-box;
}

header #topnav ul {
  display: inline-block;
}

header #topnav:after, header #topnav > ul:after {
  content: ".";
  display: block;
  clear: both;
  visibility: hidden;
  line-height: 0;
  height: 0;
}
header #topnav #head-mobile {
  display: none;
}

header #topnav > ul > li {
  z-index:100;
  float: left;
}
header #topnav > ul > li > a {
  /*padding: 17px; using narrower top and bottom padding  -> 12*/
  padding: 12px 17px;
  font-size: 12px;
  letter-spacing: 1px;
  text-decoration: none;
  color: #ddd;
  font-weight: 700;
}
header #topnav > ul > li:hover > a, header #topnav ul li.active a {
  color: #fff;
}
header #topnav > ul > li:hover, header #topnav ul li.active:hover, header #topnav ul li.active, header #topnav ul 
li.has-sub.active:hover {
  background: #4444DD !important;
  -webkit-transition: background .3s ease;
  -ms-transition: background .3s ease;
  transition: background .3s ease;
}
header #topnav > ul > li.has-sub > a {
  padding-right: 35px;
}
header #topnav > ul > li.has-sub > a:after {
  position: absolute;
  top: 16px;
  right: 11px;
  width: 8px;
  height: 2px;
  display: block;
  background: #ddd;
  content: '';
}
header #topnav > ul > li.has-sub > a:before {
  position: absolute;
  top: 13px;
  right: 14px;
  display: block;
  width: 2px;
  height: 8px;
  background: #ddd;
  content: '';
  -webkit-transition: all .25s ease;
  -ms-transition: all .25s ease;
  transition: all .25s ease;
}
header #topnav > ul > li.has-sub:hover > a:before {
  top: 23px;
  height: 0;
}
header #topnav ul ul {
  position: absolute;
  left: -9999px;
}
header #topnav ul ul li {
  height: 0;
  -webkit-transition: all .25s ease;
  -ms-transition: all .25s ease;
  background: #333;
  transition: all .25s ease;
}
header #topnav li:hover > ul {
  left: auto;
}
header #topnav li:hover > ul > li {
  height: 35px;
}
header #topnav ul ul ul {
  margin-left: 100%;
  top: 0;
}
header #topnav ul ul li a {
  
  border-bottom: 1px solid rgba(150, 150, 150, 0.15);
  vertical-align: middle;
  padding: 11px 15px;
  width: 190px;
  font-size: 10px;
  text-decoration: none;
  color: #ccc;
  font-weight: 400;
  z-index: 100;
}
header #topnav ul ul li:last-child > a, header #topnav ul ul li.last-item > a {
  border-bottom: 0;
}
header #topnav ul ul li:hover > a, header #topnav ul ul li a:hover {
  color: #444;
  background: #ccc !important;  
}
header #topnav ul ul li.has-sub > a:after {
  position: absolute;
  top: 16px;
  right: 11px;
  width: 8px;
  height: 2px;
  display: block;
  background: #999;
  content: '';
}
header #topnav ul ul li.has-sub > a:before {
  position: absolute;
  top: 13px;
  right: 14px;
  display: block;
  width: 2px;
  height: 8px;
  background: #999;
  content: '';
  -webkit-transition: all .25s ease;
  -ms-transition: all .25s ease;
  transition: all .25s ease;
}
header #topnav ul ul > li.has-sub:hover > a:before {
  top: 17px;
  height: 0;
}
header #topnav ul ul li.has-sub:hover, header #topnav ul li.has-sub ul li.has-sub ul li:hover {
  background: #999; /*363636*/
}
header #topnav ul ul ul li.active a {
  border-left: 1px solid #333;
}
header #topnav > ul > li.has-sub > ul > li.active > a, header #topnav > ul ul > li.has-sub > ul > li.active > a {
  border-top: 1px solid #333;
}

@media screen and (max-width: 816px) and (min-width: 718px) {
  header h1#top_title::after {
	content: "";    
  }
}

@media screen and (max-width: 717px)  {
  header .logo {
    position: relative;
    top: 0;
    left: 0;
    width: 280px;
    height: 40px;
    text-align: center;
    padding: 5px 0 0 0;
    float: left;
  }
  header .logo2 {
    display: none;
  }
  header nav #topnav {
    width: 100%;
  }
  header #topnav {
    width: 100%;
  }
  header #topnav ul {
    width: 100%;
    display: none;
  }
  header #topnav ul li {
    width: 100%;
    border-top: 1px solid #444;
  }
  header #topnav ul li:last-child {
    border-bottom: 1px solid #444;
  }
  header #topnav ul li:hover {
    background: #363636;
  }
  header #topnav ul ul li,
  header #topnav li:hover > ul > li {
    height: auto;
  }
  header #topnav ul li a,
  header #topnav ul ul li a {
    width: 100%;
    border-bottom: 0;
  }
  header #topnav > ul > li {
    float: none;
  }
  header #topnav ul ul li a {
    padding-left: 25px;
  }
  header #topnav ul ul li {
    background: #333 !important;
  }
  header #topnav ul ul li:hover {
    background: #999 !important;
  }
  header #topnav ul ul ul li a {
    padding-left: 35px;
  }
  header #topnav ul ul li a {
    color: #ccc;
    background: none;
  }
  header #topnav ul ul li:hover > a,
  header #topnav ul ul li.active > a {
    color: #444;
  }
  header #topnav ul ul,
  header #topnav ul ul ul {
    position: relative;
    left: 0;
    width: 100%;
    margin: 0;
    text-align: left;
  }
  header #topnav > ul > li.has-sub > a:after,
  header #topnav > ul > li.has-sub > a:before,
  header #topnav ul ul > li.has-sub > a:after,
  header #topnav ul ul > li.has-sub > a:before {
    display: none;
  }
  header #topnav #head-mobile {
    display: block;
    padding: 23px;
    color: #ccc;
    font-size: 12px;
    font-weight: 700;
  }
  header .button {
    width: 55px;
    height: 46px;
    position: absolute;
    right: 0;
    top: 0;
    cursor: pointer;
    z-index: 12399994;
  }
  header .button:after {
    position: absolute;
    top: 22px;
    right: 20px;
    display: block;
    height: 4px;
    width: 20px;
    border-top: 2px solid #444444;
    border-bottom: 2px solid #444444;
    content: '';
  }
  header .button:before {
    -webkit-transition: all .3s ease;
    -ms-transition: all .3s ease;
    transition: all .3s ease;
    position: absolute;
    top: 16px;
    right: 20px;
    display: block;
    height: 2px;
    width: 20px;
    background: #444;
    content: '';
  }
  header .button.menu-opened:after {
    -webkit-transition: all .3s ease;
    -ms-transition: all .3s ease;
    transition: all .3s ease;
    top: 23px;
    border: 0;
    height: 2px;
    width: 19px;
    background: #444;
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -ms-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
  }
  header .button.menu-opened:before {
    top: 23px;
    background: #444;
    width: 19px;
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -ms-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
  }
  header #topnav .submenu-button {
    position: absolute;
    z-index: 99;
    right: 0;
    top: 0;
    display: block;
    border-left: 1px solid #ddd;
    height: 36px;
    width: 46px;
    cursor: pointer;
  }
  header #topnav .submenu-button.submenu-opened {
    background: #B5B5B5;
  }
  header #topnav ul ul .submenu-button {
    height: 34px;
    width: 34px;
  }
  header #topnav .submenu-button:after {
    position: absolute;
    top: 22px;
    right: 19px;
    width: 8px;
    height: 2px;
    display: block;
    background: #444;
    content: '';
  }

  header h1#top_title {
    height: 0px;
    width: 0px;
    text-indent:100%;
    white-space: nowrap;
    overflow: hidden;
  }

  header #topnav ul ul .submenu-button:after {
    top: 15px;
    right: 13px;
  }
  header #topnav .submenu-button.submenu-opened:after {
    background: #000;
  }
  header #topnav .submenu-button:before {
    position: absolute;
    top: 19px;
    right: 22px;
    display: block;
    width: 2px;
    height: 8px;
    background: #444;
    content: '';
  }
  header #topnav ul ul .submenu-button:before {
    top: 12px;
    right: 16px;
  }
  header #topnav .submenu-button.submenu-opened:before {
    display: none;
  }
  header #topnav ul ul ul li.active a {
    border-left: none;
  }
  header #topnav > ul > li.has-sub > ul > li.active > a,
  header #topnav > ul ul > li.has-sub > ul > li.active > a {
    border-top: none;
  }
}