* {
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box; }

html,
body {
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale; }

@font-face {
  font-family: 'networkicons';
  src: url("fonts/networkicons.eot?aijfjx");
  src: url("fonts/networkicons.eot?aijfjx#iefix") format("embedded-opentype"), url("fonts/networkicons.ttf?aijfjx") format("truetype"), url("fonts/networkicons.woff?aijfjx") format("woff"), url("fonts/networkicons.svg?aijfjx#networkicons") format("svg");
  font-weight: normal;
  font-style: normal; }
i {
  font-family: 'networkicons';
  speak: none;
  font-style: normal;
  font-weight: normal;
  font-variant: normal;
  text-transform: none;
  line-height: 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale; }

.ic-search:before {
  content: "\e800"; }

.ic-arrow-down:before {
  content: "\e801"; }

.ic-arrow-up:before {
  content: "\e802"; }

.ic-bookmark-stroke:before {
  content: "\e803"; }

.ic-bookmark:before {
  content: "\e804"; }

.ic-contents:before {
  content: "\e805"; }

.ic-favorite-stroke:before {
  content: "\e806"; }

.ic-favorite:before {
  content: "\e807"; }

.ic-fullscreen:before {
  content: "\e808"; }

.ic-reading:before {
  content: "\e809"; }

.ic-plus:before {
  content: "\e80a"; }

.ic-minus:before {
  content: "\e80b"; }

.ic-sun:before {
  content: "\e80c"; }

.ic-moon:before {
  content: "\e80d"; }

.ic-network-alternative:before {
  content: "\e80e"; }

.ic-network:before {
  content: "\e80f"; }

@font-face {
  font-family: 'Merriweather';
  src: url("fonts/merriweather-regular-webfont.eot");
  src: url("fonts/merriweather-regular-webfont.eot?#iefix") format("embedded-opentype"), url("fonts/merriweather-regular-webfont.woff2") format("woff2"), url("fonts/merriweather-regular-webfont.woff") format("woff"), url("fonts/merriweather-regular-webfont.ttf") format("truetype"), url("fonts/merriweather-regular-webfont.svg#merriweatherregular") format("svg");
  font-weight: normal;
  font-style: normal; }
@font-face {
  font-family: 'Merriweather';
  src: url("fonts/merriweather-italic-webfont.eot");
  src: url("fonts/merriweather-italic-webfont.eot?#iefix") format("embedded-opentype"), url("fonts/merriweather-italic-webfont.woff2") format("woff2"), url("fonts/merriweather-italic-webfont.woff") format("woff"), url("fonts/merriweather-italic-webfont.ttf") format("truetype"), url("fonts/merriweather-italic-webfont.svg#merriweatheritalic") format("svg");
  font-weight: normal;
  font-style: italic; }
@font-face {
  font-family: 'Merriweather';
  src: url("fonts/merriweather-bold-webfont.eot");
  src: url("fonts/merriweather-bold-webfont.eot?#iefix") format("embedded-opentype"), url("fonts/merriweather-bold-webfont.woff2") format("woff2"), url("fonts/merriweather-bold-webfont.woff") format("woff"), url("fonts/merriweather-bold-webfont.ttf") format("truetype"), url("fonts/merriweather-bold-webfont.svg#merriweatherbold") format("svg");
  font-weight: bold;
  font-style: normal; }
@font-face {
  font-family: 'Merriweather';
  src: url("fonts/merriweather-bolditalic-webfont.eot");
  src: url("fonts/merriweather-bolditalic-webfont.eot?#iefix") format("embedded-opentype"), url("fonts/merriweather-bolditalic-webfont.woff2") format("woff2"), url("fonts/merriweather-bolditalic-webfont.woff") format("woff"), url("fonts/merriweather-bolditalic-webfont.ttf") format("truetype"), url("fonts/merriweather-bolditalic-webfont.svg#merriweatherbold_italic") format("svg");
  font-weight: bold;
  font-style: italic; }
@font-face {
  font-family: 'Maison';
  src: url("fonts/maisonneuebold-webfont.eot");
  src: url("fonts/maisonneuebold-webfont.eot?#iefix") format("embedded-opentype"), url("fonts/maisonneuebold-webfont.woff2") format("woff2"), url("fonts/maisonneuebold-webfont.woff") format("woff"), url("fonts/maisonneuebold-webfont.ttf") format("truetype"), url("fonts/maisonneuebold-webfont.svg#maison_neuebold") format("svg");
  font-weight: bold;
  font-style: normal; }
@font-face {
  font-family: 'Maison';
  src: url("fonts/maisonneuebolditalic-webfont.eot");
  src: url("fonts/maisonneuebolditalic-webfont.eot?#iefix") format("embedded-opentype"), url("fonts/maisonneuebolditalic-webfont.woff2") format("woff2"), url("fonts/maisonneuebolditalic-webfont.woff") format("woff"), url("fonts/maisonneuebolditalic-webfont.ttf") format("truetype"), url("fonts/maisonneuebolditalic-webfont.svg#maison_neuebold_italic") format("svg");
  font-weight: bold;
  font-style: italic; }
@font-face {
  font-family: 'Maison';
  src: url("fonts/maisonneuebook-webfont.eot");
  src: url("fonts/maisonneuebook-webfont.eot?#iefix") format("embedded-opentype"), url("fonts/maisonneuebook-webfont.woff2") format("woff2"), url("fonts/maisonneuebook-webfont.woff") format("woff"), url("fonts/maisonneuebook-webfont.ttf") format("truetype"), url("fonts/maisonneuebook-webfont.svg#maison_neuebook") format("svg");
  font-weight: normal;
  font-style: normal; }
@font-face {
  font-family: 'Maison';
  src: url("fonts/maisonneuebookitalic-webfont.eot");
  src: url("fonts/maisonneuebookitalic-webfont.eot?#iefix") format("embedded-opentype"), url("fonts/maisonneuebookitalic-webfont.woff2") format("woff2"), url("fonts/maisonneuebookitalic-webfont.woff") format("woff"), url("fonts/maisonneuebookitalic-webfont.ttf") format("truetype"), url("fonts/maisonneuebookitalic-webfont.svg#maison_neuebook_italic") format("svg");
  font-weight: normal;
  font-style: italic; }
body {
  font-size: 14px;
  font-family: "Maison", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: 400;
  font-style: normal;
  line-height: 1.6em;
  vertical-align: baseline;
  color: #353535;
  /* background: #fff; */
  background: #f7f7f7;
  overflow-x: hidden;
  text-size-adjust: none;
  word-wrap: break-word; }

.overflow-hidden {
  overflow: hidden; }

.header-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  width: 100%;
  padding: 0 0 0 1.6em;
  height: 67px;
  vertical-align: middle;
  background: #88E391;
  color: #fff;
  -webkit-transition: background 0.3s ease-in-out;
  transition: background 0.3s ease-in-out; }
  .header-bar .book-title {
    display: block;
    padding-top: 11px;
    color: #fff;
    line-height: 1.44em;
    letter-spacing: 0.6px;
    text-decoration: none; }
  .header-bar .reader-tabs ul {
    list-style: none;
    padding: 12px 5px 0 0;
    margin: 0;
    font-size: 0;
    line-height: 0; }
    .header-bar .reader-tabs ul li {
      display: inline-block;
      margin: 0 5px; }
      @media only screen and (min-width: 780px) {
        .header-bar .reader-tabs ul li {
          margin: 0; } }
      .header-bar .reader-tabs ul li .tab-button-contents {
        /* cursor: pointer;  */
      }
      .header-bar .reader-tabs ul li a {
        display: inline-block;
        line-height: 41px;
        font-size: 15px;
        text-decoration: none;
        vertical-align: middle;
        width: 41px;
        color: rgba(255, 255, 255, 0.9);
        text-align: center; }
        .header-bar .reader-tabs ul li a:hover {
          color: #fff; }
        .header-bar .reader-tabs ul li a.active {
          color: #AE62F5;
          background: #F5F5F5;
          cursor: default;
          border-radius: 41px; }
        .header-bar .reader-tabs ul li a i {
          position: relative;
          left: 1px; }
        .header-bar .reader-tabs ul li a .ic-contents {
          font-size: 13px; }
        .header-bar .reader-tabs ul li a .ic-bookmark {
          font-size: 16px; }
        .header-bar .reader-tabs ul li a .ic-favorite {
          font-size: 18px; }
        .header-bar .reader-tabs ul li a .ic-network-alternative {
          font-size: 20px; }
        .header-bar .reader-tabs ul li a .ic-search {
          left: 0;
          font-size: 19px; }
  @media only screen and (min-width: 780px) {
    .header-bar {
      flex-direction: row-reverse;
      padding: 0 1.6em 0 0; }
      .header-bar .book-title {
        text-align: right; }
      .header-bar .reader-tabs ul {
        padding: 0; }
        .header-bar .reader-tabs ul li a {
          line-height: 67px;
          font-size: 22px;
          text-decoration: none;
          vertical-align: middle;
          width: 67px; }
          .header-bar .reader-tabs ul li a.active {
            border-radius: 0; }
          .header-bar .reader-tabs ul li a i {
            top: auto;
            left: auto; }
          .header-bar .reader-tabs ul li a .ic-contents {
            font-size: 16px; }
          .header-bar .reader-tabs ul li a .ic-bookmark {
            font-size: 19px; }
          .header-bar .reader-tabs ul li a .ic-favorite {
            font-size: 21px; }
          .header-bar .reader-tabs ul li a .ic-search {
            left: 0;
            font-size: 22px; } }
  @media only screen and (min-width: 1020px) {
    .header-bar {
      display: block;
      position: fixed;
      top: 0;
      right: auto;
      bottom: 0;
      left: 0;
      width: 67px;
      height: 100%;
      padding: 0; }
      .header-bar .reader-tabs {
        width: 100%;
        text-align: center; }
      .header-bar .book-title {
        position: absolute;
        padding: 0;
        bottom: -10px;
        left: 14px;
        width: 198px;
        text-align: left;
        -ms-transform: rotate(-90deg);
        -webkit-transform: rotate(-90deg);
        transform: rotate(-90deg);
        transform-origin: top left; } }

.tab {
  position: fixed;
  top: 67px;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 110;
  width: 100%;
  overflow-y: auto;
  background: #F5F5F5; }
  .tab.tab-contents {
    display: none; }
    @media only screen and (min-width: 780px) {
      .tab.tab-contents {
        display: block; } }
  @media only screen and (min-width: 780px) {
    .tab {
      right: auto;
      left: 0;
      opacity: 1; } }
  @media only screen and (min-width: 1020px) {
    .tab {
      top: 0;
      left: 67px; } }

.tab-visualizations {
  z-index: 500;
  width: auto;
  background: rgba(244, 244, 244, 0.93);
  overflow-x: hidden; }

.visualizations-content {
  padding: calc(1.6em * 2) 1.6em 0 1.6em; }
  @media only screen and (min-width: 780px) {
    .visualizations-content {
      padding: calc(1.6em * 2) calc(1.6em * 2) 0 calc(1.6em * 2); } }

.book-navigation, .book-search {
  display: none;
  width: 100%;
  -moz-user-select: none;
  -khtml-user-select: none;
  -webkit-user-select: none;
  user-select: none; }
  @media only screen and (min-width: 780px) {
    .book-navigation, .book-search {
      display: block;
      z-index: 30;
      width: calc(4 * 67px);
      /* left: -133px; */
      opacity: 0;
      -webkit-transition: all 0.3s ease-in-out;
      transition: all 0.3s ease-in-out; } }
  .book-navigation > ol,
  .book-navigation > ul {
    background: #F5F5F5;
    -webkit-transition: background 0.3s ease-in-out;
    transition: background 0.3s ease-in-out; }
  .book-navigation ol,
  .book-navigation ul,
  .book-search ul,
  .book-search ol {
    list-style: none;
    margin: 0;
    padding: 0 1.6em 0 1.6em;
    overflow: hidden; }
    .book-navigation ol li,
    .book-navigation ul li
    .book-search ul li,
    .book-search ol li {
      position: relative;
      margin: 0 -1.6em;
      padding: 0 1.6em; }
      .book-navigation ol li.active,
      .book-navigation ul li.active,
      .book-search ul li.active,
      .book-search ol li.active {
        background: #fff; }
        .book-navigation ol li.active .button-expand,
        .book-navigation ul li.active .button-expand {
          -ms-transform: rotate(180deg);
          -webkit-transform: rotate(180deg);
          transform: rotate(180deg); }
        .book-navigation ol li.active > ul,
        .book-navigation ol li.active > ol,
        .book-navigation ul li.active > ul,
        .book-navigation ul li.active > ol {
          display: block; }
      .book-navigation ol li > ul,
      .book-navigation ol li > ol,
      .book-navigation ul li > ul,
      .book-navigation ul li > ol {
        display: none;
        padding-right: 0;
        padding-left: calc(1.6em / 2); }
    .book-navigation ol a,
    .book-navigation ul a {
      display: block;
      text-decoration: none;
      color: #353535;
      font-weight: bold;
      letter-spacing: 0.3px;
      padding-top: calc(1.6em / 2);
      padding-bottom: calc(1.6em / 2); }
      .book-navigation ol a:hover,
      .book-navigation ul a:hover {
        color: #000; }
      .book-navigation ol a.active,
      .book-navigation ul a.active {
        color: #fff;
        cursor: default; }
        .book-navigation ol a.active > span,
        .book-navigation ul a.active > span {
          display: inline;
          background: #AE62F5;
          padding: 4px 0;
          line-height: 1;
          box-shadow: calc(1.6em / 2) 0 0 #AE62F5, calc(1.6em / 2 * -1) 0 0 #AE62F5; }
@-moz-document url-prefix() {
  .book-navigation ol a.active > span,
  .book-navigation ul a.active > span {
    box-shadow: none;
    background: transparent;
    color: #AE62F5; } }
        .book-navigation ol a.active .section-number,
        .book-navigation ul a.active .section-number {
          color: #fff; }
@-moz-document url-prefix() {
  .book-navigation ol a.active .section-number,
  .book-navigation ul a.active .section-number {
    color: #AE62F5; } }
    .book-navigation ol .button-expand,
    .book-navigation ul .button-expand {
      display: block;
      line-height: 17px;
      width: 21px;
      text-align: center;
      position: absolute;
      font-size: 8px;
      right: 1.6em;
      top: 22px;
      color: #b5b5b5;
      border-radius: 10px;
      padding-top: 4px;
      cursor: pointer;
      -webkit-transition: all 0.1s ease-in-out;
      transition: all 0.1s ease-in-out; }
      .book-navigation ol .button-expand .ic-arrow-down,
      .book-navigation ul .button-expand .ic-arrow-down {
        display: inline-block; }
      .book-navigation ol .button-expand:hover,
      .book-navigation ul .button-expand:hover {
        background: #e0e0e0;
        color: #adadad; }
  .book-navigation > ul {
    display: none; }
    .book-navigation > ul:first-child {
      display: block; }

.tab.tab-contents {
  display: block; }
  @media only screen and (min-width: 780px) {
    .tab.tab-contents{
      display: none; } }
  @media only screen and (min-width: 1020px) {
    .tab.tab-contents{
      display: none; } }

.book-navigation, .book-search {
  display: none;
}

.book-search-visible .book-search{
  display:block;
}
.book-navigation-visible .tab.tab-contents{
  display: none; }
  @media only screen and (min-width: 780px) {
    .book-navigation-visible .tab.tab-contents, .book-search-visible .book-search{
      display: block; } }
  @media only screen and (min-width: 1020px) {
    .book-navigation-visible .tab.tab-contents, .book-search-visible .book-search{
      display: block; } }

.book-navigation-visible .book-navigation{
  opacity: 1;
  left: 0;
  display: none; }
  @media only screen and (min-width: 780px) {
    .book-navigation-visible .book-navigation, .book-search-visible .book-search {
      opacity: 1;
      left: 0; } }
  @media only screen and (min-width: 1020px) {
    .book-navigation-visible .book-navigation, .book-search-visible .book-search {
      opacity: 1;
      left: 67px; } }

.book-navigation::-webkit-scrollbar {
  display: none; }

.book-search input{
  border-style: none;
  border-bottom: 1px solid #ccc;
  width: 90%;
  margin: 20px 5%;
  height: 40px;
  padding: 10px;
  /* background-color: whitesmoke; */
}

.book-search ul li, .book-search ol li{
  margin-bottom: 20px;
  text-decoration: none;
}

.highlight{
  background-color: #88E391;
}

.book-content {
  padding: 67px 1.6em;
  font-family: Merriweather, Georgia, Times, serif;
  line-height: 1.6em;
  font-size: 14px;
  -webkit-transition: padding 0.3s ease-in-out;
  transition: padding 0.3s ease-in-out; }
  .book-content .book-content-hug {
    padding-top: calc(1.6em / 1.25); }
  @media only screen and (min-width: 780px) {
    .book-content .book-content-hug {
      max-width: 790px;
      margin: 0 auto; } }
  @media only screen and (min-width: 1020px) {
    .book-content {
      padding: 1em calc(2 * 1.6em) 0 calc(1.6em + 67px); }
      .book-content .book-content-hug {
        padding-top: 0; } }
  .book-content img {
    max-width: 100%;
    height: auto; }
  .book-content .width-30,
  .book-content .width-50,
  .book-content .width-70 {
    height: auto;
    display: block; }
  @media only screen and (min-width: 780px) {
    .book-content .width-30 {
      width: 30%;
      float: right;
      margin-left: 1.6em; } }
  @media only screen and (min-width: 780px) {
    .book-content .width-50 {
      width: 45%;
      float: right;
      margin-left: 1.6em; } }
  @media only screen and (min-width: 1220px) {
    .book-content .width-50 {
      width: 50%;
      float: right;
      margin-left: 1.6em; } }
  @media only screen and (min-width: 780px) {
    .book-content .width-70 {
      width: 70%; } }
  .book-content .clearfix {
    clear: both; }
  .book-content .math {
    width: 100% !important;
    overflow: auto; }
    @media only screen and (min-width: 780px) {
      .book-content .math {
        width: auto;
        overflow: initial; } }

@media only screen and (min-width: 780px) {
  .book-navigation-visible .book-content, .book-search-visible .book-content{
    padding-left: calc(67px * 4 + 1.6em); } }
@media only screen and (min-width: 1020px) {
  .book-navigation-visible .book-content, .book-search-visible .book-content {
    padding: 1em calc(2 * 1.6em) 0 calc(67px * 4 + 1.6em + 67px); } }

.next-chapter {
  display: block;
  text-align: center;
  text-decoration: none;
  font-family: "Maison", "Helvetica Neue", Helvetica, Arial, sans-serif;
  line-height: 4em;
  margin: 1.6em 0 calc(1.6em / 2);
  line-height: 1.6em;
  padding: 1.6em 0 2em;
  color: #808080 !important;
  text-decoration: none; }
  .next-chapter strong {
    color: #AE62F5;
    font-size: 1.6em;
    line-height: 1.3em; }
  .next-chapter:hover strong {
    color: #c792f8; }
  .next-chapter:active strong {
    color: #9532f2; }

.book-options {
  position: fixed;
  z-index: 90;
  bottom: 0;
  right: -200px;
  display: flex;
  align-items: flex-end;
  -moz-user-select: none;
  -khtml-user-select: none;
  -webkit-user-select: none;
  user-select: none;
  color: #808080;
  -webkit-transition: right 0.22s ease-in-out;
  transition: right 0.22s ease-in-out; }
  .book-options.expanded {
    right: 0; }

.option-tabs {
  width: 40px;
  margin: 0;
  padding: 0;
  list-style: none; }
  .option-tabs li {
    display: block;
    width: 40px;
    line-height: 40px;
    margin-bottom: 1px;
    font-size: 12px;
    cursor: pointer;
    text-align: center;
    vertical-align: middle;
    background: rgba(245, 245, 245, 0.93); }
    .option-tabs li:hover {
      background: rgba(247, 247, 247, 0.97);
      color: #353535; }
    .option-tabs li:active, .option-tabs li.active {
      background: #787878;
      color: #fff; }

.option-tab {
  display: flex;
  min-height: 70px;
  line-height: 1.6em;
  text-align: center;
  width: 200px;
  color: #fff; }
  .option-tab div {
    display: block;
    width: 100px;
    height: 82px;
    background: #808080; }
    .option-tab div:first-child {
      background: #787878; }
  .option-tab ul {
    display: inline-block;
    line-height: 82px;
    list-style: none;
    margin: 0;
    padding: 0;
    vertical-align: middle; }
    .option-tab ul li {
      display: inline-block;
      vertical-align: middle;
      line-height: 1;
      margin: 0 1px;
      width: 24px;
      text-align: center; }
      .option-tab ul li:first-child, .option-tab ul li:last-child {
        margin: 0;
        cursor: pointer;
        font-size: 17px;
        color: rgba(255, 255, 255, 0.7); }
      .option-tab ul li:hover {
        color: #fff; }
      .option-tab ul li:active {
        color: #f1f1f1; }
  .option-tab .change-fontsize .letter {
    cursor: pointer;
    font-family: Merriweather, Georgia, Times, serif;
    font-weight: bold;
    font-size: 14px;
    padding-top: 2px;
    overflow: hidden; }
  .option-tab .change-color li {
    width: 38px;
    padding: 0;
    line-height: 36px;
    padding-top: 2px;
    border-radius: 20px; }
    .option-tab .change-color li:hover {
      background: #787878; }
    .option-tab .change-color li.active {
      background: #353535;
      color: #fff;
      cursor: default; }
      .option-tab .change-color li.active:hover {
        background: #353535; }

.section-number {
  font-family: "Maison", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 12px;
  font-weight: normal;
  letter-spacing: 0.3px;
  margin: 0;
  color: #8f8f8f; }

h1,
h2,
h3,
h4,
h5 {
  margin: 0 0 14px 0;
  font-family: "Maison", "Helvetica Neue", Helvetica, Arial, sans-serif;
  letter-spacing: 0.3px;
  line-height: 1.6em; }

h2 {
  font-size: 1.857em;
  line-height: 1.35em;
  margin-top: 3px; }

h3 {
  font-size: 1.4em; }

p {
  margin: 0 0 1.6em 0; }

ul,
ol {
  margin: 0 0 1.6em 0;
  padding-left: 0;
  list-style: inside; }

blockquote {
  margin: 1.6em 0;
  padding-right: calc(1.6em / 2);
  font-size: 1.6em;
  line-height: 1.6em;
  font-style: italic; }

a,
a:visited,
a:active {
  color: inherit; }

table {
  width: 100%;
  margin-bottom: calc(1.6em / 2);
  text-align: left;
  border-collapse: collapse;
  font-family: "Maison", "Helvetica Neue", Helvetica, Arial, sans-serif;
  border: none; }

th,
td {
  vertical-align: baseline;
  padding: 8px 5px;
  border: 0; }
  th:first-child,
  td:first-child {
    padding-left: 0; }
  th:last-child,
  td:last-child {
    padding-right: 0; }

th {
  border-bottom: 2px solid #a9a9a9; }

td {
  border-bottom: 1px solid #a9a9a9; }

tr:hover td,
tr:hover th {
  border-bottom-color: #353535; }

.responsive-tables {
  width: 100%;
  overflow: auto; }
  @media only screen and (min-width: 780px) {
    .responsive-tables {
      width: auto;
      overflow: initial; } }

figure {
  margin: 0 0 1.6em 0;
  font-family: "Maison", "Helvetica Neue", Helvetica, Arial, sans-serif; }
  figure.fright {
    width: 26vw;
    float: right;
    margin-top: 0;
    margin-left: 1.6em;
    margin-bottom: calc(1.6em * 2);
    clear: both; }
  figure.fleft {
    width: 26vw;
    float: left;
    margin-top: 0;
    margin-right: 1.6em;
    margin-bottom: calc(1.6em * 2); }

.fig-nr {
  font-size: 12px;
  font-weight: normal;
  letter-spacing: 0.3px;
  color: #8f8f8f; }

.fig-title {
  font-weight: bold; }

.online-resource{
  height: 10vw;
  width: 100%;
  background: #e6e6e6;
  position: relative;
  border-radius: 5px;
  margin-top: 10px;
}
@media only screen and (max-width: 780px) {
  .online-resource{
    height: 20vw;
  }
}

.online-resource img{
  height: 100%;
  width: 20%;
  object-fit: cover;
  opacity: 0.8;
  border: #e6e6e6 1px solid;
}

.online-resource a{
  font-size: 150%;
  color: #ae62f5;
  left: 25%;
  top: 4vw;
  position: absolute;
  text-decoration:none;
  text-transform: uppercase;
  overflow: hidden;
  height: 50px;
  width: 70%;
}

.online-resource a:hover{
  opacity: 0.5;
}

.online-resource a::after{
  /* content: '\25B6 '; */
  content:"\25B6""\A" attr(href);
  font-size: 60%;
  padding-left: 10px;
}

.tip {
  clear: both;
  padding: 1.6em;
  margin-bottom: 1.6em;
  background: #808080;
  color: #fff; }
  .tip .section-number {
    color: #c6c6c6; }
  .tip p:last-child {
    margin-bottom: 0; }
  .tip tr:hover td,
  .tip tr:hover th {
    border-bottom-color: #ccc; }

.reader-footer {
  padding-top: 1.6em;
  padding-bottom: 1.6em;
  display: flex;
  flex-wrap: no-wrap;
  justify-content: space-between;
  align-items: stretch;
  align-content: stretch;
  color: #808080;
  -webkit-transition: all 0.2s ease-in-out;
  transition: all 0.2s ease-in-out; }
  .reader-footer div {
    width: 30%; }

body.night-mode {
  background: #404040;
  color: #f7f7f7; }
  body.night-mode .header-bar {
    background: #262626; }
  body.night-mode .header-bar .reader-tabs ul li a.active {
    background: #303030; }
  body.night-mode .header-bar .reader-tabs ul li a.active {
    color: #fff; }
  body.night-mode .book-navigation > ol,
  body.night-mode .book-navigation > ul,
  body.night-mode .tab {
    background: #303030; }
  body.night-mode .book-navigation ol li.active,
  body.night-mode .book-navigation ul li.active {
    background: #404040; }
  body.night-mode .book-navigation ol a,
  body.night-mode .book-navigation ul a {
    color: #a0a0a0; }
  body.night-mode .book-navigation ol a.active > span, body.night-mode .book-navigation ul a.active > span {
    background: #262626;
    box-shadow: calc(1.6em / 2) 0 0 #262626, calc(1.6em / 2 * -1) 0 0 #262626; }
  body.night-mode .book-navigation ol .button-expand:hover,
  body.night-mode .book-navigation ul .button-expand:hover {
    background: #262626; }
  body.night-mode .tip {
    background: #353535; }
  body.night-mode .book-content img {
    opacity: 0.8; }
  body.night-mode .reader-footer {
    opacity: 0.8;
    color: #e0e0e0; }

.cards {
  list-style: none;
  padding: calc(1.6em / 2); }
  @media only screen and (min-width: 780px) {
    .cards {
      display: flex;
      flex-wrap: wrap;
      align-items: stretch;
      justify-content: flex-start;
      padding: 0 2.4em; } }

.card {
  padding: calc(1.6em / 2); }
  @media only screen and (min-width: 780px) {
    .card {
      width: 33.33%; } }
  @media only screen and (min-width: 1220px) {
    .card {
      width: 25%; } }
  .card .card-link {
    display: block;
    background: #fff;
    text-decoration: none; }
  .card .card-image {
    display: block;
    height: 210px;
    background: #333 no-repeat center center;
    background-size: cover; }
    @media only screen and (min-width: 780px) {
      .card .card-image {
        height: 180px; } }
    @media only screen and (min-width: 1020px) {
      .card .card-image {
        height: 200px; } }
    @media only screen and (min-width: 1220px) {
      .card .card-image {
        height: 220px; } }
  .card .card-label {
    display: block;
    padding: 1.6em; }
    .card .card-label h2 {
      margin: 0 0 calc(1.6em / 4) 0;
      font-size: 1.2em; }
    .card .card-label p {
      margin: 0; }
  .card:hover h2 {
    color: #AE62F5; }
  .card:active h2 {
    color: #9532f2; }

#particles-js{
  width: 100vw;
  height: 44vw;
  background-color: #333;
  /* background-image: url("https://i.pinimg.com/originals/69/e1/2e/69e12e9ede5936eedabed8483b5f08ef.jpg"); */
  position:absolute;
}

.front-page .intro {
  position: relative;
  z-index: 1;
  width: 100vw;
  height: 50vw;
  /* background: #2A2A2A no-repeat center center; */
  /* background: -webkit-linear-gradient(#1F1F1F, #2B2B2B) no-repeat center center;
  background: -o-linear-gradient(#1F1F1F, #2B2B2B) no-repeat center center;
  background: -moz-linear-gradient(#1F1F1F, #2B2B2B) no-repeat center center;
  background: linear-gradient(#1F1F1F, #2B2B2B) no-repeat center center; */ */
  color: #fff; }
.front-page .intro.supplement{
  position: relative;
  z-index: 1;
  width: 100vw;
  height: 44vw;
  color: #fff;
}
  .front-page .intro .btn {
    position: absolute;
    bottom: 15%;
    left: 50%;
    transform: translate(-50%, 0); }
    @media only screen and (min-width: 1020px) {
      .front-page .intro .btn {
        bottom: 30%; } }
.front-page .vis-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url(../../../images/bg-vis.png) no-repeat center center;
  background-size: contain;
  opacity: 0; }
.front-page h1 {
  position: absolute;
  left: 0;
  right: 0;
  top: 20%;
  text-align: center;
  font-size: 40px;
  line-height: 1.2em;
  font-weight: bold;
  color: #fff;}
  @media only screen and (min-width: 780px) {
    .front-page h1 {
      left: 50%;
      top: 20%;
      right: auto;
      transform: translate(-242px, -56px);
      text-align: center;
      font-size: 50px;
      color: #fff; }
    .front-page .supplement h1{
      top: 30%;
      transform: translate(-200px, -56px);
    }
  }
  .front-page h1 span {
    font-size: 20px;
    font-weight: normal; }
    @media only screen and (min-width: 780px) {
      .front-page h1 span {
        font-size: 30px; } }
.front-page .intro-viz {
  display: none; }
.front-page .intro-viz {
  position: absolute;
  top: 20%;
  left: 45%;
  transform: translate(-270px, -320px);
  text-align: center; }
  @media only screen and (min-width: 780px) {
    .front-page .intro-viz {
      display: block; } }
  .front-page .intro-viz svg {
    display: inline-block; }
  .front-page .intro-viz .link {
    fill: none;
    stroke: #ccc;
    stroke-width: 1px; }
  .front-page .intro-viz #level2 {
    font-size: 14px;
    font-weight: 400;
    fill: #999;
    /* border: 1px black solid; */
    /* text-shadow: #000 0px 0px 1px, #000 0px 0px 2px, #000 0px 0px 5px, #000 0px 0px 10px;  */
  }
  .front-page .intro-viz #level2:hover {
    font-weight: 900;
    /* fill: white;  */
  }
  .front-page .intro-viz #level3 {
    font-size: 12px;
    font-weight: 200;
    fill: #f0f0f0;
    text-shadow: 0 0 10px black; }
  .front-page .intro-viz #level3:hover {
    font-weight: 400;
    fill: white; }
  .front-page .intro-viz #name {
    position: relative;
    top: -20px;
    left: 10px;
    /*line-height: .5;*/ }
.front-page .description {
  position: relative;
  z-index: 2;
  padding: 0 1.6em; }
  @media only screen and (min-width: 780px) {
    .front-page .description {
      display: flex;
      justify-content: space-between; } }
  @media only screen and (min-width: 1020px) {
    .front-page .description {
      padding: 0; } }

.description.supplement{
  display: block;
}

.front-page .cover {
  display: none;
  z-index: 2;
  background: #c0c0c0 url(../../../../../images/networksciencebook-cover.jpg) no-repeat center bottom;
  background-size: cover;
  box-shadow: 1px 0 32px rgba(0, 0, 0, 0.15); }

  .front-page .cover.russian{
    background: url(../../../../../images/networksciencebook-cover-russian.png);
    background-size: cover;
  }

  .front-page .cover.persian{
    background: url(../../../images/networksciencebook-cover-persian.png);
    background-size: cover;
  }

  .rtl .MathJax{
    text-align: right;
  }

  .front-page .cover.japanese{
    background: url(../../../images/networksciencebook-cover-japanese.jpg);
    background-size: cover;
    float:left;
    margin: 0;
  }

  @media only screen and (min-width: 780px) {
    .front-page .cover {
      display: block;
      margin-top: -10px;
      width: 45vw;
      height: 70vw; } }
  @media only screen and (min-width: 1020px) {
    .front-page .cover {
      width: 50vw;
      height: 70vw;
      margin-top: -40px; } }
  @media only screen and (min-width: 1020px) {
    .front-page .cover {
      margin-top: -60px; } }
.front-page .about {
  width: 90%;
  margin: 0 auto;
  padding: 0 1.6em 0 1.6em; }
  @media only screen and (min-width: 780px) {
    .front-page .about {
      width: 50vw;
      margin: 0;
      padding: 0; }
      .front-page .about .about-container {
        padding-left: 5vw;
        padding-top: 5vw;
        padding-bottom: 6vw; } }
    @media only screen and (min-width: 780px) and (min-width: 1020px) {
      .front-page .about .about-container {
        background: #f7f7f7; } }
  @media only screen and (min-width: 780px) {
      .front-page .about p {
        box-sizing: border-box;
        max-width: 350px;
        padding-right: 0;
        margin-bottom: 34px; } }
  @media only screen and (min-width: 1020px) {
    .front-page .about {
      padding: 0; } }
  .front-page .about blockquote {
    padding-right: 0;
    margin: 34px 0;
    color: #AE62F5;
    font-style: italic;
    font-size: 19px;
    line-height: 1.65em; }
    @media only screen and (min-width: 780px) {
      .front-page .about blockquote {
        font-size: 22px;
        margin-top: 0; } }
    @media only screen and (min-width: 1020px) {
      .front-page .about blockquote {
        font-size: 24px; } }


.langMenu{
  position: absolute;
  z-index: 4;
  color: #ccc;
  left: 50%;
  bottom: 20%;
  /* max-width: 33%; */
  transform: translate(-50%, 0);
}
  @media only screen and (max-width: 1020px) {
    .langMenu{
      bottom: 5%;
    }
  }
  @media only screen and (max-width: 780px) {
    .langMenu{
      bottom: -5%;
    }
  }

.translationmenu ul{
  list-style: none;
}

.translationmenu ul li{
  float:left;
  padding-right: 20px;
}

.translationmenu ul li:hover{
  color: white;
}

.translationmenu ul li a{
  text-decoration: none;
}

.footer {
  text-align: center;
  justify-content: space-between;
  background: #fff;
  padding: calc(1.6em * 1.6) 1.6em; }
  @media only screen and (min-width: 780px) {
    .footer {
      display: flex;
      text-align: left; } }
  .footer .legal {
    margin-bottom: 15px;
    line-height: 24px;
    vertical-align: middle; }
    @media only screen and (min-width: 780px) {
      .footer .legal {
        margin-bottom: 0; } }

.footer.supplement{
  clear:both;
}

.legal {
  color: #808080; }

.socials {
  list-style: none;
  margin: 0;
  padding: 0; }
  .socials li {
    display: inline-block;
    margin: 0 0 0 calc(1.6em / 2); }
    .socials li a {
      display: inline-block;
      text-indent: -9999px;
      width: 24px;
      height: 24px;
      background: no-repeat center center;
      background-size: contain; }
  .socials .twitter {
    background-image: url(../../../images/twitter-circle.svg); }
  .socials .facebook {
    background-image: url(../../../images/facebook-circle.svg); }

.btn {
  font-size: 1em;
  line-height: 3.6em;
  padding: 0 2.2em;
  text-decoration: none;
  letter-spacing: 0.5px;
  text-align: center;
  vertical-align: middle;
  display: inline-block;
  font-weight: bold;
  background: #353535;
  /* color: #fff !important;  */
  color: #333 !important;
}
  .btn:hover {
    background: #393939; }
  .btn:active {
    background: #303030; }

.btn-green {
  background: #88E391; }
  .btn-green:hover {
    background: #b1edb7; }
  .btn-green:active {
    background: #5fd96b; }

.btn-stroke {
  background: none;
  border: 1px solid #353535;
  color: #353535 !important; }
  .btn-stroke:hover {
    background: none;
    border-color: #393939;
    color: #393939; }
  .btn-stroke:active {
    background: none;
    border-color: #303030;
    color: #303030; }

.btn-group {
  margin: 0;
  padding: 0;
  list-style: none; }
  .btn-group li {
    display: block;
    padding: 0;
    margin: 0 0 1.6em 0; }
    .btn-group li .btn {
      display: block; }
    @media only screen and (min-width: 780px) {
      .btn-group li {
        display: inline-block;
        margin: 0 1.6em 1.6em 0; } }

.disabled-link {
  pointer-events: none;
  cursor: default; }

/*! Hint.css - v2.2.1 - 2016-03-26
* http://kushagragour.in/lab/hint/
* Copyright (c) 2016 Kushagra Gour; Licensed  */
[data-hint] {
  position: relative;
  display: inline-block; }

[data-hint]:after, [data-hint]:before {
  position: absolute;
  -webkit-transform: translate3d(0, 0, 0);
  -moz-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
  visibility: hidden;
  opacity: 0;
  z-index: 1000000;
  pointer-events: none;
  -webkit-transition: .3s ease;
  -moz-transition: .3s ease;
  transition: .3s ease;
  -webkit-transition-delay: 0ms;
  -moz-transition-delay: 0ms;
  transition-delay: 0ms; }

[data-hint]:hover:after, [data-hint]:hover:before {
  visibility: visible;
  opacity: 1;
  -webkit-transition-delay: 100ms;
  -moz-transition-delay: 100ms;
  transition-delay: 100ms; }

[data-hint]:before {
  content: '';
  position: absolute;
  background: 0 0;
  border: 6px solid transparent;
  z-index: 1000001; }

[data-hint]:after {
  content: attr(data-hint);
  background: #383838;
  color: #fff;
  padding: 8px 10px;
  font-size: 12px;
  font-family: "Helvetica Neue",Helvetica,Arial,sans-serif;
  line-height: 12px;
  white-space: nowrap;
  text-shadow: 0 -1px 0 #000;
  box-shadow: 4px 4px 8px rgba(0, 0, 0, 0.3); }

[data-hint='']:after, [data-hint='']:before {
  display: none !important; }

.hint--top-left:before, .hint--top-right:before, .hint--top:before {
  border-top-color: #383838; }

.hint--bottom-left:before, .hint--bottom-right:before, .hint--bottom:before {
  border-bottom-color: #383838; }

.hint--top:after, .hint--top:before {
  bottom: 100%;
  left: 50%; }

.hint--top:before {
  margin-bottom: -11px;
  left: calc(50% - 6px); }

.hint--top:after {
  -webkit-transform: translateX(-50%);
  -moz-transform: translateX(-50%);
  transform: translateX(-50%); }

.hint--top:focus:before, .hint--top:hover:before {
  -webkit-transform: translateY(-8px);
  -moz-transform: translateY(-8px);
  transform: translateY(-8px); }

.hint--top:focus:after, .hint--top:hover:after {
  -webkit-transform: translateX(-50%) translateY(-8px);
  -moz-transform: translateX(-50%) translateY(-8px);
  transform: translateX(-50%) translateY(-8px); }

.hint--bottom:after, .hint--bottom:before {
  top: 100%;
  left: 50%; }

.hint--bottom:before {
  margin-top: -11px;
  left: calc(50% - 6px); }

.hint--bottom:after {
  -webkit-transform: translateX(-50%);
  -moz-transform: translateX(-50%);
  transform: translateX(-50%); }

.hint--bottom:focus:before, .hint--bottom:hover:before {
  -webkit-transform: translateY(8px);
  -moz-transform: translateY(8px);
  transform: translateY(8px); }

.hint--bottom:focus:after, .hint--bottom:hover:after {
  -webkit-transform: translateX(-50%) translateY(8px);
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.hint--right:before {
  border-right-color: #383838;
  margin-left: -11px;
  margin-bottom: -6px; }

.hint--right:after {
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.hint--right:after, .hint--right:before {
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  bottom: 50%; }

.hint--right:focus:after, .hint--right:focus:before, .hint--right:hover:after, .hint--right:hover:before {
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  transform: translateX(8px); }

.hint--left:before {
  border-left-color: #383838;
  margin-right: -11px;
  margin-bottom: -6px; }

.hint--left:after {
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.hint--left:after, .hint--left:before {
  right: 100%;
  bottom: 50%; }

.hint--left:focus:after, .hint--left:focus:before, .hint--left:hover:after, .hint--left:hover:before {
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.hint--top-left:after, .hint--top-left:before {
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.hint--top-left:before {
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.hint--top-left:after {
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  -moz-transform: translateX(-100%);
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.hint--top-left:focus:before, .hint--top-left:hover:before {
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.hint--top-left:focus:after, .hint--top-left:hover:after {
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.hint--top-right:after, .hint--top-right:before {
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.hint--top-right:before {
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.hint--top-right:after {
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  -moz-transform: translateX(0);
  transform: translateX(0);
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.hint--top-right:focus:after, .hint--top-right:focus:before, .hint--top-right:hover:after, .hint--top-right:hover:before {
  -webkit-transform: translateY(-8px);
  -moz-transform: translateY(-8px);
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.hint--bottom-left:after, .hint--bottom-left:before {
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.hint--bottom-left:before {
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.hint--bottom-left:after {
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.hint--bottom-left:focus:before, .hint--bottom-left:hover:before {
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  -moz-transform: translateY(8px);
  transform: translateY(8px); }

.hint--bottom-left:focus:after, .hint--bottom-left:hover:after {
  -webkit-transform: translateX(-100%) translateY(8px);
  -moz-transform: translateX(-100%) translateY(8px);
  transform: translateX(-100%) translateY(8px); }

.hint--bottom-right:after, .hint--bottom-right:before {
  top: 100%;
  left: 50%; }

.hint--bottom-right:before {
  margin-top: -11px;
  left: calc(50% - 6px); }

.hint--bottom-right:after {
  -webkit-transform: translateX(0);
  -moz-transform: translateX(0);
  transform: translateX(0);
  margin-left: -12px; }

.hint--bottom-right:focus:after, .hint--bottom-right:focus:before, .hint--bottom-right:hover:after, .hint--bottom-right:hover:before {
  -webkit-transform: translateY(8px);
  -moz-transform: translateY(8px);
  transform: translateY(8px); }

.hint--large:after, .hint--medium:after, .hint--small:after {
  white-space: normal;
  line-height: 1.4em; }

.hint--small:after {
  width: 80px; }

.hint--medium:after {
  width: 150px; }

.hint--large:after {
  width: 300px; }

.hint--error:after {
  background-color: #b34e4d;
  text-shadow: 0 -1px 0 #592726; }

.hint--error.hint--top-left:before, .hint--error.hint--top-right:before, .hint--error.hint--top:before {
  border-top-color: #b34e4d; }

.hint--error.hint--bottom-left:before, .hint--error.hint--bottom-right:before, .hint--error.hint--bottom:before {
  border-bottom-color: #b34e4d; }

.hint--error.hint--left:before {
  border-left-color: #b34e4d; }

.hint--error.hint--right:before {
  border-right-color: #b34e4d; }

.hint--warning:after {
  background-color: #c09854;
  text-shadow: 0 -1px 0 #6c5328; }

.hint--warning.hint--top-left:before, .hint--warning.hint--top-right:before, .hint--warning.hint--top:before {
  border-top-color: #c09854; }

.hint--warning.hint--bottom-left:before, .hint--warning.hint--bottom-right:before, .hint--warning.hint--bottom:before {
  border-bottom-color: #c09854; }

.hint--warning.hint--left:before {
  border-left-color: #c09854; }

.hint--warning.hint--right:before {
  border-right-color: #c09854; }

.hint--info:after {
  background-color: #3986ac;
  text-shadow: 0 -1px 0 #1a3c4d; }

.hint--info.hint--top-left:before, .hint--info.hint--top-right:before, .hint--info.hint--top:before {
  border-top-color: #3986ac; }

.hint--info.hint--bottom-left:before, .hint--info.hint--bottom-right:before, .hint--info.hint--bottom:before {
  border-bottom-color: #3986ac; }

.hint--info.hint--left:before {
  border-left-color: #3986ac; }

.hint--info.hint--right:before {
  border-right-color: #3986ac; }

.hint--success:after {
  background-color: #458746;
  text-shadow: 0 -1px 0 #1a321a; }

.hint--success.hint--top-left:before, .hint--success.hint--top-right:before, .hint--success.hint--top:before {
  border-top-color: #458746; }

.hint--success.hint--bottom-left:before, .hint--success.hint--bottom-right:before, .hint--success.hint--bottom:before {
  border-bottom-color: #458746; }

.hint--success.hint--left:before {
  border-left-color: #458746; }

.hint--success.hint--right:before {
  border-right-color: #458746; }

.hint--always:after, .hint--always:before {
  opacity: 1;
  visibility: visible; }

.hint--always.hint--top:before {
  -webkit-transform: translateY(-8px);
  -moz-transform: translateY(-8px);
  transform: translateY(-8px); }

.hint--always.hint--top:after {
  -webkit-transform: translateX(-50%) translateY(-8px);
  -moz-transform: translateX(-50%) translateY(-8px);
  transform: translateX(-50%) translateY(-8px); }

.hint--always.hint--top-left:before {
  -webkit-transform: translateY(-8px);
  -moz-transform: translateY(-8px);
  transform: translateY(-8px); }

.hint--always.hint--top-left:after {
  -webkit-transform: translateX(-100%) translateY(-8px);
  -moz-transform: translateX(-100%) translateY(-8px);
  transform: translateX(-100%) translateY(-8px); }

.hint--always.hint--top-right:after, .hint--always.hint--top-right:before {
  -webkit-transform: translateY(-8px);
  -moz-transform: translateY(-8px);
  transform: translateY(-8px); }

.hint--always.hint--bottom:before {
  -webkit-transform: translateY(8px);
  -moz-transform: translateY(8px);
  transform: translateY(8px); }

.hint--always.hint--bottom:after {
  -webkit-transform: translateX(-50%) translateY(8px);
  -moz-transform: translateX(-50%) translateY(8px);
  transform: translateX(-50%) translateY(8px); }

.hint--always.hint--bottom-left:before {
  -webkit-transform: translateY(8px);
  -moz-transform: translateY(8px);
  transform: translateY(8px); }

.hint--always.hint--bottom-left:after {
  -webkit-transform: translateX(-100%) translateY(8px);
  -moz-transform: translateX(-100%) translateY(8px);
  transform: translateX(-100%) translateY(8px); }

.hint--always.hint--bottom-right:after, .hint--always.hint--bottom-right:before {
  -webkit-transform: translateY(8px);
  -moz-transform: translateY(8px);
  transform: translateY(8px); }

.hint--always.hint--left:after, .hint--always.hint--left:before {
  -webkit-transform: translateX(-8px);
  -moz-transform: translateX(-8px);
  transform: translateX(-8px); }

.hint--always.hint--right:after, .hint--always.hint--right:before {
  -webkit-transform: translateX(8px);
  -moz-transform: translateX(8px);
  transform: translateX(8px); }

.hint--rounded:after {
  border-radius: 4px; }

.hint--no-animate:after, .hint--no-animate:before {
  -webkit-transition-duration: 0ms;
  -moz-transition-duration: 0ms;
  transition-duration: 0ms; }

.hint--bounce:after, .hint--bounce:before {
  -webkit-transition: opacity 0.3s ease, visibility 0.3s ease, -webkit-transform 0.3s cubic-bezier(0.71, 1.7, 0.77, 1.24);
  -moz-transition: opacity 0.3s ease, visibility 0.3s ease, -moz-transform 0.3s cubic-bezier(0.71, 1.7, 0.77, 1.24);
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s cubic-bezier(0.71, 1.7, 0.77, 1.24); }

.supplement-materials ul li{
  float: left;
  list-style: none;
  width: 23vw;
  height: 13.9vw;
  margin: 0.5vw;
}

.supplement-materials a{
  text-decoration: none;
  line-height: normal;
}

.supplement-materials ul li a img{
  width: 23vw;
  height: 10vw;
  object-fit: cover;
}

.supplement-materials img a:hover {
  border: #c792f8 3px solid;
}
.supplement-materials a:hover {
  color: #c792f8;
}
@media only screen and (max-width: 780px) {
  .supplement-materials ul li{
    height: 18vw;
    margin: 1vw;
  }
  .description.supplement{
    margin-left: 8vw;
  }
}
/*# sourceMappingURL=main.css.map */