/* BRIEF DESCRIPTION OF STYLESHEET'S PURPOSE.

   developer:   estevaot
   requires:    
                
   ========================================================================== */

/* ==========================================================================
   Common
   ========================================================================== */

  *,
  :after,
  :before {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      text-decoration: none;
      font-family: 'Source Sans Pro', Arial, sans-serif;
  }

  html, body {
      -moz-text-size-adjust: 100%;
      -ms-text-size-adjust: 100%;
      -webkit-text-size-adjust: 100%;
      background: #fff;
      color: #000;
      font-family: Arial, sans-serif;
      font-size: 16px;
      font-weight: 400;
      height: 100%;
      line-height: 1.3;
      min-width: 320px;
      width: 100%;
  }

  tt { font-family: monospace; }
  img.inlineformula { vertical-align: middle; }

  main {
    max-width: 1000px;
    margin: 0 auto;
    padding-top: 4.375rem;
  }

  header {
    grid-area: header;
  }

  #home  { display: grid; } 

  #container {
    display: grid;
    grid-template-columns: minmax(200px, 1fr) minmax(auto, 972px);
    grid-template-areas: ". header" "left content";
    column-gap: 1rem;
  }

  #container #content {
    grid-area: content;
    max-width: 972px;
    border-top: 3px solid #A9E163;
    padding: 1.25rem 1.875rem 3.125rem 1.875rem; 
    box-shadow: 0 3px 10px -1px rgba(0, 0, 0, 0.25);
    -webkit-box-shadow: 0 3px 10px -1px rgba(0, 0, 0, 0.25);
    -moz-box-shadow: 0 3px 10px -1px rgba(0, 0, 0, 0.25);
    min-height: 620px;
  }

  #container .left-side {
    grid-area: left;
    max-width: 200px;
    padding-top: 1.5625rem;
    text-align: left;
  }

  #container .topics-nav a {
    display: table;
    font-size: 0.875rem;
    font-weight: 600;
    color: #535353;
    margin-bottom: 12px;
  }

  /*#container .topics-nav a.active,
  #container .secondary-nav a.active {
    color: #0095AA;
    border-bottom: 2px solid #0095AA;
  }*/

  #container .secondary-nav a {
    display: table;
    font-size: 0.875rem;
    font-weight: 400;
    color: #777;
    margin-bottom: 12px;
  }
  
  #container .topics-nav a:hover,
  #container .secondary-nav a:hover {
    color: #0095AA;
  }

/*  #content .breadcrumb {
    max-width: 500px;
  }*/

  #content .breadcrumb:not(:last-of-type) {
    margin-bottom: .1rem;
  }

  #content nav:first-of-type {
    margin-bottom: 1.125rem;
  }

  #content nav:not(.open) .breadcrumb:nth-child(n+4) {
    display: none;
  }

  #content .breadcrumb li {
    display: inline;
    font-size: .875rem;
    font-weight: 400;
    color: #9D9D9D;
  }

  #content .breadcrumb li a,
  #content nav:first-of-type > a {
    font-size: .875rem;
    font-weight: 400;
    color: #9D9D9D;
  }

  #content .breadcrumb li a:hover,
  #content nav:first-of-type > a:hover {
    color: #006174;
  }

  #content .breadcrumb li::after {
    content: "›";
    margin-left: .25rem;
  }

  /* Icons for attachments - notebook, explore.. */

  #content .attachments {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 1.25rem;
  }

  #content .attachments a {
    display: flex;
    align-self: flex-end;
    justify-content: flex-start;
    align-content: center;
    align-items: center;
    font-size: 0.875rem;
    line-height: 1rem;
    color: #777;
    text-align: left;
    max-width: 140px;
  }

  #content .attachments a:not(:first-of-type) {
    margin-left: 30px;
  }

  #content .attachments a:hover {
    color: #006174;
  }

  #content .attachments a img {
    margin-right: .375rem;
  }

  /* Attachments for explore icons */

  .classroom #content .attachments { justify-content: flex-start; }
  #content .attachments a.explore img { 
    width: 15px; 
    height: 15px; 
    margin-right: 6px; 
  }
  
  #topics #content .attachments a.explore { 
    color: #0095AA;
    font-size: 14px;
    max-width: 250px; 
  }

  /* Content */

  #content > *:not(h1) {
    margin-bottom: 1.5rem;
  }

  #content h1 {
    font-size: 2rem;
    font-weight: 400;
    color: #535353;
  }

  #content h2,
  .news .references-head {
    font-size: .625rem;
    font-weight: 600;
    text-transform: uppercase;
    color: #0095AA;
    letter-spacing: 0.48px;
    border-top: 1px solid #DFDFDF;
    border-color: #DFDFDF;
    width: 100%;
    margin: 16px auto 7px auto;
    padding-top: 1rem;
  }

  #content hr+hr {
    display:none;
  }

  #content hr+h2 {
    border-top:0;
    margin-top: 0;
    padding-top: 0;
  }

  #content p {
    font-size: 16px;
    line-height: 25.6px;
    font-weight: 400;
    color: #777;
  }

  #content p img {
    display: inline;
    vertical-align: middle;
  }

  #content a {
    color: #0095AA;
  }

  #content a:hover {
    color: #005174;
  }

  #content cite,
  .news #content .references p {
    display: block;
    font-size: 14px;
    line-height: 20px;
    margin-bottom: .5rem;
    font-style: normal;
    color: #777;
  }

  #content cite img {
    display: inline;
    vertical-align: middle;
  } 

  #content .center-image {
    display: block;
    margin-right: auto;
    margin-left: auto;
    margin-bottom: 24px;
  }

  #content .explore-classroom {
    display: block;
    margin-top: 10px;
  }


/* ==========================================================================
   Homepage
   ========================================================================== */

  #home {
    background: top center url(/images/frontpage/background.png) no-repeat;
    background-color: #fff;
    background-color: cover;
  }

  #home header img {
    max-width: 600px;
  }

  #home header form {
      width: 100%;
      background: #fff;
      border: 2px solid #A9E163;
      border-radius: 4px;
      padding: .625rem;
      margin-top: 1.25rem;
      display: flex;
      justify-content: space-between;
  }

  #home header form input {
    width: calc(100% - 25px);
    border: none;
    font-size: 16px;
    color: #333;
    font-family: 'Source Sans Pro', Arial, sans-serif;
    font-weight: 400;
  }

  #home header form input:focus {
    outline: none;
  }

  #home header form button {
    border: none;
    background: none;
    margin-top: .125rem;
    cursor: pointer;
  }

  #home #categories {
    margin: 3.75rem auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: auto;
    column-gap: 1.4375rem;
    row-gap: 1.75rem;
  }
    
  #home #categories a {
    text-decoration: none;
  }

  #home #categories div {
    background: #fff;
    border: 2px solid #fff;
    border-radius: 4px;
    padding: 0.875rem;
    box-shadow: 0 0 6px #bdbdbd;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    transition: all 0.15s ease-in-out;
   }

  #home #categories div:hover {
    border: 2px solid #A9E163;
    box-shadow: 0 0 6px #A9E163;
  }

  #home #categories h3 {
    color: #222;
    font-family: 'Source Sans Pro', Arial, sans-serif;
    font-weight: 600;
    font-size: 1.125rem;
    line-height: 1.375rem;
  }

  #home #categories img {
    max-width: 46px;
    margin-right: .625rem;
  }


  #home #text-description {
    margin: 3.75rem auto;
  }

  #home #text-description h2 {
    color: #222;
    font-family: 'Source Sans Pro', Arial, sans-serif;
    font-style: italic;
    font-size: 1.125rem;
    line-height: 1.6rem;
    margin-bottom: .625rem;
    font-weight: 400;
  }

  #home #text-description .h2-description {
    color: #0095A9;
    font-family: 'Source Sans Pro', Arial, sans-serif;
    font-size: 0.875rem;
    line-height: 1.5rem;
    font-weight: 400;
  }
  
/* ==========================================================================
   Topics
   ========================================================================== */

  #topics { display: grid; } 

  #topics main {
    padding-top: 3.125rem;
    max-width: 1172px;
    min-width: 800px;
  }

  #content hr {
    background: none;
    border: none;
    border-bottom: 1px solid;
    border-color: #A9E163;
    margin: .5rem 0;
  }

  #content hr.gray-rule {
    border-color: #eee;
    margin: 1rem auto;
    width: 100%;
  }

  #topics header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    height: 35px;
    z-index: 999;
  }

  #topics #header-dropdown-menu {
    display: none;
  }

  #topics header #logo img {
    max-width: 447px;
    width: 447px;
  }

  #topics header #search input {
    font-size: .875rem;
    font-weight: 400;
    color: #222;
    border: none;
    border-bottom: 1px solid #DFDFDF;
    padding: 0 0 0.35rem 0.1rem;
    width: 250px;
  }

  #topics header #search input::placeholder {
    font-style: italic;
    color: #AEAEAE;
  }

  #topics header #search input:focus {
    outline: none;
  }

  #topics header #search .search-btn {
    background: none;
    border: none;
    top: 7px;
    position: relative;
    cursor: pointer;
  }

  /* topics - search on header */
  #topics header.openSearch >:not(form),
  #topics header #search-close,
  #topics header.openSearch form .search-btn,
  #topics header.openSearch #header-dropdown-menu {
    display: none;
  }

  #topics header.openSearch #search input {
    display: block;
  }

  #topics header.openSearch form {
    display: flex;
    justify-content: flex-end;
    width: 100%;
    margin-bottom: 3px;
    margin-top: 5.76px;
  }

  #topics header.openSearch form #search-close {
    display: block;
  } 

  #topics header.openSearch #search > input {
    width: calc(100% - 20px);
    margin-right: 6px;
    transition: all .5s ease;
  }

  /* topics - content */

  #topics main:not(#subtopics) #content {
    padding-top: 24px;
  }

  #topics #dropdown-topics-menu-close {
    display: none;
  }

  #topics .topics-list {
    /*display: grid;*/
    list-style-type: none;
    margin-top: 1.625rem;
    color: #0095AA;
    -webkit-column-gap: 4rem;
       -moz-column-gap: 4rem;
            column-gap: 4rem;
    -webkit-row-gap: 1rem;
       -moz-row-gap: 1rem;
            row-gap: 1rem;
  }

  #topics .topics-list.three-columns {
    -webkit-columns: 3 200px;
       -moz-columns: 3 200px;
            columns: 3 200px;
  }

  #topics .topics-list li {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    display: inline-block;
    width: 100%;
  }

  #topics .topics-list li:not(:last-of-type) {
    margin-bottom: 1rem;
  }

  #topics main:not(#subtopics) .topics-list li::before {
    content: "";
    background: url(/images/header/ham-sandwich-icon.png);
    height: 10px;
    width: 14.5px;
    position: relative;
    display: inline-block;
    background-size: 14.5px 10px;
    margin-right: .5rem;
    margin-bottom: 0rem;
  }

  #topics .topics-list li a span {
    font-size: 0.875rem;
    color: #777;
  }
 
  #topics footer {
    margin: 3.75rem auto 0;
  }


/* ==========================================================================
   Subtopics
   ========================================================================== */

  #subtopics #content {
    padding-bottom: 3.75rem;
  }

  #subtopics #content nav {
    margin-bottom: 0.25rem;
  }

  #subtopics #content .breadcrumb:last-of-type {
    margin-bottom: 0;
  }

/* ==========================================================================
   Entry
   ========================================================================== */

  #topics main#entry #content {
    padding-top: 20px;
    padding-bottom: 25px;
  }

  #entry #content h1 {
    color: #0095AA;
  }

  #entry #content h2:first-of-type:not(p + h2) {
    border: none;
    margin-top: 0;
    padding-top: 0;
  }

  #content .entry-content p {
    color: #222;
    margin: 12px 0;
  }

  #entry .entry-secondary-content cite,
  #entry .entry-secondary-content a,
  #content .entry-secondary-content p,
  .news #content .references p, 
  .news #content .references a {
    font-size: 14px;
    line-height: 20px;
    word-break: break-word;
    line-break: auto;
  }

  #content p.cite-as {
    font-size: 14px;
    line-height: 20px;
    color: #777;
  }

  /* equations */
  .eqnum {
    padding-left: 10px;
  }

  /* What's new */

  .whatsnew #content hr:first-of-type { margin-bottom: 26px; }
  .whatsnew #content ul { margin-left:50px; }
  .whatsnew #content li.new  { color:#A9E163; }
  .whatsnew #content li.mod  { color:#aaa; }
  .whatsnew #content li.subj { color:#00ff00; }
  .whatsnew #content h3 {
    margin-bottom: 5px;
    font-size: 15px;
    font-weight: 600;
    color: #535353;
  }

  /* Classroom pages */
  .classroom #container { 
    grid-template-columns:1fr;
    grid-template-areas: "header" "content";
  }

  .classroom .left-side { display: none; }
  #topics.classroom #container #content {
    background: center top url(../images/classroom/mathworld-logo-graphic.png) no-repeat;
    background-size: 230px 70px;
    padding-top: 82px;
  }

  .classroom #content h1 {margin-bottom: 6px;}
  .classroom #content h3.references-head { 
    border-top: 1px solid #ddd;
    margin-top: 20px;
    padding-top: 15px;
    font-size: 14px;
    color: #535353;
    font-weight: 600;
    text-transform: uppercase;
  }

  .classroom #content table { 
    color: #777;
    margin-bottom: 10px; 
  }

  .classroom #content table + h3.references-head {
    margin-top: 30px;
  }

  .classroom #content table tr:not(:first-of-type) td {
    padding-top: 10px;
  }

  .classroom ul li {
    color: #777;
  }

  /* News */
  .news #content h2 { 
    font-size: 20px;
    color: #535353; 
    margin-top: 20px;
  }

  .news #content h3:first-of-type {
    text-align: right;
    top: -30px;
    position: relative;
    margin-bottom: 5px;
    font-weight: 400;
    font-size: 15px;
  }

  .news #content li { list-style-position: inside; }
  .news .references-head { display: block; text-align: left; }
  .news .references { text-align: left; }
  .news #content br { display: none; }
  .news #content blockquote * { font-family: monospace; font-size: 14px; }
  .news #content blockquote { margin-left: 40px; }
  .news #content blockquote br { display: block; margin-bottom: 8px; }

/* ==========================================================================
   Search page
   ========================================================================== */

  .search-page #content h1 {
    font-size: 16px; 
    color: #535353;
    font-weight: 500;
    margin-top: 20;
    margin-bottom: 12px;
  }

  .search-page .search-summary, 
  .search-page .search-divider, 
  .search-page .search-all, 
  .search-page .search-divider-bottom,
  .search-page .search-navigation-prevnext { display:none; }

  .search-page .search-result-title { padding-left: 0; }
  .search-page .search-result-summary, 
  .search-page .search-result-summary a {
    color: #535353;
    font-size: 14px;
  }

  /* Search pagination */
  #content .search-navigation .search-navigation-paginator {
    float: none;
  }

  #content .search-navigation .search-navigation-paginator * {
    color:#9D9D9D;
    font-size: 14px;
  }

  #content .search-navigation .search-navigation-paginator a:hover {
    color: #777;
  }

  #content .search-navigation .search-navigation-paginator strong {
    color: #0095aa;
  }

  #content .search-navigation-paginator-divider {
    padding-left: 6px;
    padding-right: 6px;
  }

  .search-page .search-result-title {
    color: #0095AA;
    margin-top: 30px;
  }

  .search-page .search-result-type,
  .search-page .search-result-type a, 
  .search-page .search-result-title a:link,
  .search-page .search-result-separator,
  .search-separator { 
    color: #777;
    font-weight: 400;
    font-size: 16px;
  }

  .search-page .search-result-title a:link { color: #0095AA; }

  .search-page .search-result-summary { 
    margin-bottom: 30px;
    margin-top: 5px; 
    word-wrap: break-word;
    line-break: auto;
    max-width: 80vw;
  }
  
  .search-page .search-result-summary:last-of-type { margin-bottom: 40px; }

/* ==========================================================================
   Inputs and forms
   ========================================================================== */

  #WAbox {
    background: #FAF9FA;
    border: 2px solid #ECEBEB;
    padding: 1.25rem 1.444rem;
    display: grid;
    grid-template-columns: auto min(250px,300px);
    column-gap: .625rem;
    align-items: center;
  }

  #WAbox #WAbox-secondary {
    display: grid;
    grid-template-columns: minmax(auto,137px) auto;
    column-gap: .625rem;
    align-items: center;
  }

  #WAbox #WAbox-secondary img {
    width: 174px;
    margin-right: .75rem;
  }

  #WAbox #WAbox-secondary form,
  #WAwidget form {
    padding: .625rem;
    color: #A2A2A2;
    font-family: 'Source Sans Pro', Arial, sans-serif;
    font-size: .9375rem;
    border: 2px solid #ECEBEB;
    border-radius: 4px;
    width: 100%;
    background: #fff;
    display: flex;
    justify-content: space-between;
    align-content: center;
  }

  #WAbox #WAbox-secondary input,
  #WAwidget input {
    font-family: 'Source Sans Pro', Arial, sans-serif;
    border: none;
    width: 100%;
  }

  #WAbox #WAbox-secondary form input::placeholder,
  #WAwidget form input::placeholder {
    font-family: 'Source Sans Pro', Arial, sans-serif;
    font-size: .9375rem;
    font-style: italic;
  }
  
  #WAbox #WAbox-secondary input:focus,
  #WAwidget input:focus {
    outline: none;
  }

  #WAbox #WAbox-secondary button,
  #WAwidget button {
    background-color: #ff6c00;
    -webkit-mask-image: url("/images/wolframalpha/WA-evaluate-icon.svg");
    mask-image: url("/images/wolframalpha/WA-evaluate-icon.svg");
    width: 20px;
    height: 19px;
    background-size: 20px 20px;
    border: none;
    cursor: pointer;
  }

  #WAbox #WAbox-secondary button:hover,
  #WAwidget button:hover { background: #DD0E00 ; }

  #WAbox #WAbox-links {
    border-left: 2px solid #ECEBEB;
    color: #6E6E6E;
    font-family: 'Source Sans Pro', Arial, sans-serif;
    font-size: 0.875rem;
    padding-left: 1.875rem;
    margin-left: 1.875rem;
  }

  #WAbox #WAbox-links p {
    margin-bottom: .25rem;
  }

  #WAbox #WAbox-links ul li {
    list-style: none;
    list-style-type: none;
  }

  #WAbox #WAbox-links ul li:not(:last-of-type) {
    margin-bottom: 4px;
  }

  #WAbox #WAbox-links ul li a {
    color: #ff6c00;
  }

  #WAbox #WAbox-links ul li a:hover {
    color: #ec561a;
  }

  #WAbox #WAbox-links ul li a::after {
    content: '»';
    margin-left: .25rem;
  }

/* ==========================================================================
   Wolfram Alpha Widget - Entries 
   ========================================================================== */

  #WAwidget {
    max-width: 650px;
    padding-top: 10px;
   }

  #WAwidget .WAwidget-wrapper {
    display: grid;
    grid-template-columns: 136px auto;
    column-gap: 10px;
    align-items: center;
  }

  #WAwidget .WAwidget-wrapper:first-of-type {
    margin-bottom: 15px;
  }

  #WAwidget img {
    width: 136px;
    margin-right: 10px;
  }

  #WAwidget form {
    border: 1px solid #FF933A;
    border-radius: 5px;
    font-size: 14px;
    color: #222;
    padding: 4px 10px;
  }

  #WAwidget form:hover {
    box-shadow: 0 0 0 1px #ffc230; 
  }

  #WAwidget .try p {
    align-self: flex-start;
    font-size: 12px;
    color: #656565;
    padding-top: 5px;
  }

  #WAwidget .try li {
    list-style-type: none;
    display: inline-block;
    margin: 0 4px 10px 0;
    border: 1px solid #DDD;
    padding: 0 10px;
    border-radius: 5px;
    background: #fff;
  }

  #WAwidget .try li a:before {
    content: "=";
    color: #FF9522;
    margin-right: 5px;
  }

  #WAwidget .try li a {
    font-size: 12px;
    color: #777;
  }

  #WAwidget .try li:hover,
  #WAwidget .try li a:hover {
    color: #FF9522;
  }

/* ==========================================================================
   404 page
   ========================================================================== */
  
  #topics main.error {
    max-width: 800px;
    font-family: 'Source Sans Pro', Arial, Helvetica, sans-serif;
    font-weight: 400;
  }

  main.error section {
    max-width: 700px;
    margin: 50px auto;
  }

  main.error h1 {
    color: #666;
    font-size: 2rem;
    line-height: 2.6rem;
    font-weight: 400;
    margin: 0 0 1.25rem;
  }

  main.error h1 span {
    font-size: 3.75rem;
    display: inline-block;
    padding-bottom: 1rem;
  }

  main.error p {
    color: #666;
    font-size: 1rem;
    line-height: 1.9rem;
  }

  main.error ul {
    columns: 2;
    -webkit-columns: 2 ;
    -moz-columns: 2;
    column-gap: 4rem;
    -webkit-column-gap: 4rem;
    -moz-column-gap: 4rem;
  }

  main.error li {
    list-style-type: none;
  }

  main.error a {
    display: block;
    page-break-inside: avoid;
    font-size: 15px;
  }

  main.error li a p::before {
    content: '»';
    color: #1d98ac;
    display: inline;
    margin-right: .25rem;
  }

  main.error .left-arrow-before::before {
    color: #1d98ac;
    content: '←';
  }

  main.error #header-dropdown-menu {
    display: none !important;
  }

/* ==========================================================================
   Footer + bottom
   ========================================================================== */

  #bottom { align-self: flex-end; }

  footer {
    max-width: 1000px;
    font-family: 'Source Sans Pro', Arial, sans-serif;
    margin-top: 3.125rem;
    padding-bottom: 36px;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
  }

  footer li, footer a {
    font-size: 12px;
    color: #777;
    font-weight: 600;
  }

  footer a:hover {
    color: #006174;
  }

  footer ul:nth-child(2) {
    margin-top: 0.8125rem;
    margin-bottom: .125rem;
  }

  footer ul:nth-child(2) li a {
    font-weight: 400;
  }

  footer ul li {
    list-style-type: none;
    display: inline-block;
    font-size: 1rem;
  }

  footer ul li img {
    top: 9px;
    position: relative;
    margin-right: 8px;
  }

  footer ul li:not(:last-of-type)::after {
    content: '';
    display: inline-block;
    height: 11px;
    width: 1px;
    background: #777;
    margin-left: .25rem;
    top: 2px;
    position: relative;
  }

  footer ul:nth-child(1) li:nth-of-type(4):after,
  footer ul:nth-child(3) li:first-of-type:after {
    content: "";
    height: 0;
  }

  #acknowledgment {
    background: #f0f0f0;
    font-size: .75rem;
    line-height: 1.125rem;
    font-weight: 600;
    color: #777;
    text-align: center;
    padding: .8rem 0;
    margin-top: 1.25rem;
    position: relative;
    bottom: 0;
    width: 100%;
    align-self: flex-end;
  }


/* ==========================================================================
   Tables
   ========================================================================== */

  .mathworldtable, .mathworldtable tr, .mathworldtable td,
  .news table, .news table tr, .news table td {
    border-collapse: separate;
    border: 1px solid #E0E0E0;
    padding: 5px;
  }
  table.mathworldtable, .news table {margin-left:auto; margin-right:auto;}
  table.mathworldtable td, .news table td { padding:5px; }
  table#directory {  margin:20px 0 0 0; width:100%; }
  table#directory td { width:33%; padding-bottom:10px; color: #009999; }
  table#directorysix {  margin:20px 0 0 0; width:33%; }
  table#directorysix td { width:16.6%; font-family: Tahoma,Verdana,Arial,Helvetica,sans-serif; font-size: 18px; padding-bottom:10px; color: #009999; }

  /* Responsive tables */

  .table-responsive {
    overflow: auto;
    max-width: 85vw;
    min-width: 300px;
    box-sizing: border-box;
    margin: 20px 0;
    -webkit-overflow-scrolling: touch;
    width: 100%;
  }

  .table-responsive table {
    /*width:100%;*/
    margin:0 auto;
    border:none;
    background-color:#FFF;
    border-collapse:collapse;
    border-spacing:0;
    /*border: 1px solid #E0E0E0;*/
    box-sizing: border-box;
    padding: 0;
  }
  .table-responsive table th {
    background:#777;
    border-right:1px solid #999;
    color:#fff;
    padding:3px;
    position:sticky;
    top:0;
    z-index:1;
  }
  .table-responsive table td {
    background:#fff;
    /*border-right:1px solid #ccc;
    border-bottom:1px solid #ccc;*/
    padding:6px 8px;
  }
  .table-responsive.table-full-width table th:first-child {
    position:sticky;
    left:0;
    z-index:4;
  }
  .table-responsive.table-full-width table td:first-child {
    position:sticky;
    left:0;
    border-right-color:#aaa;
    z-index: 2;
  }
  .table-responsive.table-full-width table.fixed-columns-2 th:nth-child(2) {
    position:sticky;
    left:0;
    z-index:5;
  }
  .table-responsive.table-full-width table.fixed-columns-2 td:nth-child(2) {
    position:sticky;
    left:0;
    border-right-color:#aaa;
    z-index: 3;
  }

  .table-responsive.table-full-width table {
    border-collapse:separate;
  }

  .table-responsive.table-full-height.table-full-width {
    border-top: 1px solid #E0E0E0;
  }

  .table-responsive.table-full-height.table-full-width tr:first-of-type,
  .table-responsive.table-full-height.table-full-width tr:first-of-type td {
    border-top: 0;
  }

/* ==========================================================================
   Misc
   ========================================================================== */

  .close-btn {
    cursor: pointer;
    display: block;
  }

  a.show-more, a.show-less { cursor: pointer; }

  .c-777, .c-777 p, .c-777 div { color: #777; }

  .display-b {display: block !important;}
  .display-n {display: none !important;}
  .display-grid {display: grid !important;}

  .two-columns { grid-template-columns: repeat(2,1fr); }
  .three-columns { grid-template-columns: repeat(3,1fr); }

  .padding-t-0 {padding-top: 0 !important;}
  .text-align-c {text-align: center;}
  .text-align-l {text-align: left;}
  .text-align-r {text-align: right;}

  .margin-t-0 {margin-top: 0 !important;}
  .margin-t-1-8 {margin-top: .125rem !important;}
  .margin-t-1-7-8 {margin-top: 1.875rem !important;}
  .margin-t-1-1-4 { margin-top: 1.25rem !important; }
  .margin-b-1-1-4 { margin-bottom: 1.25rem !important; }
  .margin-b-3-4 { margin-bottom: 12px !important; }
  .margin-bt-1-1-4 { margin-bottom: 1.25rem !important; margin-top: 1.25rem !important; }
  
  .display-i {display: inline;}

  .list li {
    list-style-position: inside;
  }


/* ==========================================================================
   responsive breakpoint styles
   ========================================================================== */

/* styles for large screens (1200px)
   ========================================================================== */

@media all and (max-width: 1200px) {
  
  html { font-size: 15px; }
  main { margin: 0 auto; }
  
  main .wrapper,
  #WAbox { 
    margin: 0 2rem; 
  }
  
  #home { background-position: top right; }
  #home #categories {
    column-gap: 2.25rem;
    row-gap: 1.25rem;
  }

  #topics header.openSearch form { 
    margin-bottom: 6.41px;
    margin-top: 1px;
  }

  /* topics - entries */
  #topics header { align-items: inherit; }
  #topics header #logo img { max-width: 400px; }
  #topics header #search input {  display: none; }

  #topics #entry #content .attachments { justify-content: flex-start; }
  #content .attachments a img { width: 17.18px; height: 18.82px; }
  #topics #entry .attachments a { 
    align-items: end;
    max-width: 100%; 
  }

  /* Tables */
  .table-responsive {
    display: grid;
    grid-template-columns: minmax(400px,900px);
  }

  /* Misc */
  .display-ib__1200 { display: inline-block !important; }

}

/* styles for medium screens (900px)
   ========================================================================== */

@media all and (max-width: 900px) {
  
  html { font-size: 14px; }
  
  main .wrapper,
  footer { 
    max-width: 692px;
    margin-right:auto; 
    margin-left:auto; 
  }

  main {
    margin: 0 30px;
  }

  #container {
    grid-template-columns: minmax(290px,692px);
    grid-template-areas: "header" "left" "content";
  }

  #container .left-side {
    display: none;
  }

  header #logo,
  header #logo img {
    width: 100%;
  }

  /* Topics */

  #topics main { 
    padding-top: 107px;
    min-width: auto; 
  }

  #topics #entry { padding-top: 97px; }

  #topics header {
    position: fixed;
    top: 0;
    width: 100%;
    height: auto;
    left: 0;
    background: #fff;
    padding: 6px 30px 8px;
    box-shadow: 0 3px 10px -1px rgba(0, 0, 0, 0.25);
  }

  #topics #header-dropdown-menu {
    display: flex;
    align-items: center;
    cursor: pointer;
  }

  #topics #header-dropdown-menu img {
    margin-right: 7px;
  }

  #topics #header-dropdown-menu span {
    font-size: 13px;
    text-transform: uppercase;
    font-weight: 600;
    color: #0095AA;
    margin-top: 2px;
  }

  #topics #dropdown-topics-menu-close {
    margin: 0 14px 14px 16px;
    display: block;
    filter: grayscale(1);
  }

  #topics #dropdown-topics-menu-close:hover {
    filter: grayscale(0);
  }

  /* header search */

  #topics header.openSearch { background: #0095AA; }
  #topics header.openSearch form { margin-top: 7px; } 
  #topics header.openSearch #search input,
  #topics header.openSearch #search input::placeholder { 
    background: none;
    color: #fff;
    font-size: 16px;
  }
  #topics header.openSearch #search .close-btn {
    filter: brightness(0) invert(1);
  }

  /* content  */

  #container .left-side {
    display: none;
    position: fixed;
    top: 0;
    max-width: 288px;
    padding: 14px 0;
    background: #fff;
    box-shadow: 0 3px 10px -1px rgba(0, 0, 0, 0.25);
    visibility: hidden;
    opacity: 0;
    transition: visibility 1s, opacity 0.5s linear;
    animation: menuFramesClose ease 1s;
    animation-iteration-count: 1;
    transform-origin: 50% 50%;
    overflow-y: scroll;
    z-index: 999;
    max-height: 80vh;
  }

  #container .left-side.show-menu {
    display: block;
    left: 0;
    visibility: visible;
    opacity: 1;
    animation: menuFramesOpen ease 1s;
    animation-iteration-count: 1;
    transform-origin: 50% 50%;
  }

  #container .topics-nav a {
    font-size: 16px;
    padding: 14px 16px;
    width: 100%;
    margin: 0;
  }

  #container .topics-nav a.active {
    background: #0095AA;
    color: #fff;
  }

  #container .secondary-nav a {
    font-size: 14px;
    padding: 14px 16px;
    width: 100%;
    margin: 0;
  }

  #container .topics-nav a.active,
  #container .secondary-nav a.active {
    padding-bottom: 14px;
  }

  /* Home  */

  #home #categories {
    grid-template-columns: repeat(2, 1fr);
    column-gap: 26px;
    row-gap: 16px;
  }
  #home #categories h3 {
    font-size: 16px;
    line-height: 22px;
  }

  #home #text-description h2 {
    font-size: 16px;
    margin-bottom: 7px;
  }

  #home #text-description .h2-description {
    font-size: 1rem;
  }

  #WAbox {
    background: none;
    border: none;
    padding: 0;
    grid-template-columns: 1fr;
    column-gap: 0;
    row-gap: 18px;
    margin: 0;
    margin-bottom: 50px;
  }

  #WAbox #WAbox-secondary {
    display: grid;
    grid-template-columns: minmax(auto,137px) auto;
    column-gap: .625rem;
    align-items: center;
    padding: 1.875rem 1.444rem;
    background: #FAF9FA;
    border: 2px solid #ECEBEB;
  }

  #WAbox #WAbox-links {
    margin: 0 auto;
    padding: 0;
    display: flex;
    border: none;
    justify-content: space-between;
  }

  #WAbox #WAbox-links ul li {
    display: inline-block;
    margin-left:30px;
  }

  /* Footer 900px */

  footer { margin-bottom: 30px; }
  footer ul li { font-size: .8rem; }

  footer ul:nth-child(n+2) {
    margin-top: 0.8125rem;
    margin-bottom: .125rem;
  }

  /* Misc */
  .two-columns__900 { 
    grid-template-columns: repeat(2,1fr); 
    -webkit-columns: 2 100px !important;
       -moz-columns: 2 100px !important;
            columns: 2 100px !important;
  }

  .display-n__900 { display: none !important; }
  .display-i__900 { display: inline !important; }
  .display-ib__900 { display: inline-block !important; }

}

/* styles for small screens (600px)
   ========================================================================== */
@media all and (max-width: 670px) {
  #WAbox form input::placeholder { 
    color: #fff;
  }
}


@media all and (max-width: 600px) {
  html { font-size: 13px; }
  main { 
    max-width: 100%; 
    margin-left: 15px;
    margin-right: 15px; 
    padding-bottom: 1px;
  }
  main .wrapper {
    margin: 0 auto;
    justify-content: center;
  }

  /* topics */

  #topics main { padding-top: 91px; }
  #topics #entry { padding-top: 71px; }
  #topics main #content { padding-top: 0; }
  
  #topics header #logo img { 
    top: 3px;
    position: relative;
    max-width: 237px; 
  }

  #container #content {
    border: none;
    box-shadow: none;
    padding: 0 15px;
    min-height: auto;
  }

  #topics #entry #content .attachments { justify-content: flex-end; }
  #content .attachments a img { width: 26px; height: 27px; }
  #topics #entry .attachments a { max-width: 85px; }
 
  /* subtopics */
  #topics #subtopics { padding-top: 70px; }

  /* home  */
  
  #home #categories {
    margin: 30px auto 40px;  
    grid-template-columns: 1fr;
    row-gap:12px; 
  }

  #home header form {margin-top: 30px}

  #home #text-description {
    margin-top: 0;
    margin-bottom: 40px;
  }

  #WAbox { padding: 0; }

  #WAbox #WAbox-secondary {
    display: grid;
    grid-template-columns: auto;
    padding: 0;
    background: none;
    border: none;
  }

  #WAbox #WAbox-tertiary { 
    padding: 20px;
    background: #FAF9FA;
    border: 2px solid #ECEBEB;
  }
    
  #WAbox #WAbox-secondary img {
    justify-self: center;
    width: 180px;
    height:auto;
    margin-bottom: 12px;
  }

  #WAbox #WAbox-links p { flex-basis: 70px; }

  #WAbox #WAbox-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    width: 100%;
  }

  #WAbox #WAbox-links ul li {
    margin-left: 12px;
  }

  /* WA widget for 600px */

  #WAwidget .try li {
    margin-bottom: 10px;
    display: table;
  }

  /* News */
  .news #content h2 { margin-top: 30px; }
  .news #content h3:first-of-type {
    text-align: left;
    top: 0;
    margin-bottom: 1.5rem;
    font-size: 15px;
  }

  /* Tables for <600px */
  .table-responsive table { 
    width: 100%; 
    position: relative;
  }

  .table-responsive.table-responsive-icon table::before {
    content: "";
    background: url('/images/entries/table-sidescroll-icon.png');
    width: 80px;
    height: 80px;
    position: absolute;
    top: 18px;
    margin: 0 calc(50vw - 70px);
    z-index: 3;
    animation-name: translate-horizontally;
    animation-iteration-count: infinite;
    animation-duration: 1.5s;
    opacity: 1;
  }

  @keyframes translate-horizontally {
    0% {
      transform:
        translate(0px, 0px)
        scale(1);
    }
    25% {
      transform:
        translate(10px, 0px)
        scale(1);
    }
    50% {
      transform:
        translate(0px, 0px)
        scale(1);
    }
    75% {
      transform: 
        translateY(10px)
        scale(1);
    }
  }

  .table-responsive.table-responsive-icon table.icon-out::before {
    display: none;
  }

  /* Classroom */
  #topics.classroom main { padding-top: 58px; }
  #topics.classroom main #content { padding-top: 82px; }

  /* footer */

  #topics #bottom { border-top: 1px solid #eee; }

  footer { 
    border-top: none; 
    margin: 0 auto;
    max-width: 300px;
  }

  footer ul {
    max-width: 300px;
    margin-left: auto;
    margin-right: auto;
  }

  footer ul:nth-child(1) li:nth-child(4):after {
    content: "";
    height: 11px;
  }
  
  footer ul:nth-child(1) li:nth-child(2):after,
  footer ul:nth-child(2) li:nth-child(2):after,
  footer ul:nth-child(3) li:nth-child(4):after,
  footer ul:nth-child(3) li:last-of-type:after {
    content: "";
    height: 0;
  }

  footer ul li { font-size: 1rem; }
  footer ul:not(:first-of-type) { margin-top: 15px; }

  #home header,
  #home section:not(#WAbox),
  #home footer {
    padding-left: 30px;
    padding-right: 30px;
    margin-left: auto;
    margin-right: auto;
    max-width: 480px;
  }

  /* 404 page */
  main.error section {
    padding-left: 15px;
    padding-right: 15px;
    margin: 0 auto;
  }

  main.error footer {
    margin-top: 40px;
  }
 
  /* Tables */
  .table-responsive {
    max-height: 500px;
  }

  /* Misc */
  .display-n__600 { display: none !important; }
  .display-b__600 { display: block !important; }
  .display-i__600 { display: inline !important; }
  .display-ib__600 { display: inline-block !important; }

  .one-column__600 { 
    grid-template-columns: 1fr; 
    -webkit-columns: 1 !important;
       -moz-columns: 1 !important;
            columns: 1 !important;
  }

}

/* styles for minimum supported screen width (320px)
   ========================================================================== */

@media all and (max-width: 320px) {
  .display-n__320 { display: none; }
  #home header, 
  #home section:not(#WAbox), 
  #home footer {
    padding-left: 20px;
    padding-right: 20px;
  }

  #WAbox #WAbox-links ul li {
    display: block;
    margin-left: 0;
    text-align: center;
  }
  #WAbox #WAbox-links ul li:not(:last-child) {
    margin-bottom:12px;
  }

  /* WA widget for 600px */

  #WAwidget .WAwidget-wrapper {
    grid-template-columns: 90px auto;
  }
  #WAwidget img { width: 87px; }

}

/* printer styles
   ========================================================================== */

@media print {}


/* Animations
   ========================================================================== */

@keyframes menuFramesOpen{
  0% { width:  translate(-280px,0px); }
  100% { transform:  translate(0px,0px); }
}

@keyframes menuFramesClose{
  0% { transform:  translate(0px,0px); }
  100% { transform:  translate(-280px,0px);  }
}