body #book {
  width: 41em;
  font-size: 18px;
  font-family: Georgia, serif;
  line-height: 1.5;
  margin-left: 5em;
  color: #070707;
  margin-bottom: 20em;
}

#book h1 {
  font-size: 230%;
  border-top: 2px solid #333;
  padding-top: 1em;
}
#book h2 {
  font-size: 180%;
  margin-top: 1.5em;
}
#book h3 {
  margin-top: 1.5em;
}
#book h4 {
  margin-top: 2em;
}
#book img.tex {
  vertical-align: -6px;
}
#book .title {
  text-align: center;
  font-size: 250%;
}
#book .subtitle {
  border-top: none;
  padding-top: 0;
  margin: 0;
  text-align: center;
  font-size: 140%;
}
#book .author, #book .date {
  margin-top: 1em;
  text-align: center;
}
#book a {
  color: #002f72;
  text-decoration: underline;
}
#book a.tex {
  text-decoration: none;
}
#book code {
  font-size: 95%;
  color: darkgreen;
  font-weight: bold;
}
#book .number {
  margin-right: 1em;
}
#book h1 span.number {
  display: block;
  margin-bottom: 0.5em;
  font-size: 80%;
}
#book span.number {
  font-weight: bold;
}
#book .label, #book .header {
  font-weight: bold;
  margin-right: 0.5em;
}
#book .caption .header {
  font-weight: normal;
}
#book .code {
  margin-top: 0.2em;
  width: 100%;
  white-space: pre;
  font-family: "Courier New", Courier, monospace;
  border: 1px solid #999;
  background: #eee;
  margin-bottom: 1em;
}
#book .codelisting {
  width: 100%;
  border: 1px solid #999;
  background: #eee;
  margin-bottom: 1em;
  margin-top: 1em;
}
#book .codelisting .code {
  border: 0;
  margin-bottom: 0;
}
#book .codelisting .heading {
  width: 100%;
  background: #ccc;
  line-height: 1.2;
  padding-top: 0.1em;
  padding-bottom: 0.3em;
}
#book .codelisting .heading .number {
  margin-right: 0.3em;
  margin-left: 0.3em;
}
#book .codelisting .heading span.filepath {
  display: block;
  margin-left: 0.4em;
  margin-top: 0.2em;
  margin-bottom: 0.1em;
  padding-top: 10px;
  font-style: italic;
}
#book .codelisting span.break {
  margin-top: -0.4em;
}
#book .code .highlight .lineno {
  color: #666;
  font-weight: normal;
}
#book .filepath {
  font-family: Courier, monospace;
  font-size: 80%;
}
#book .inline_verbatim {
  font-family: Courier, monospace;
}
#book a.ref {
  color: #002f72;
}
#book .graphics.image {
  text-align: center;
}
#book .graphics.image img {
  margin-top: 2em;
  max-width: 100%;
}
#book .graphics.image.box img {
  border: 1px solid #666;
}
#book a .graphics img {
  display: block;
  margin: 2em auto auto;
}
#book .table {
  text-align: center;
  margin-top: 2em;
}
#book table.tabular {
  margin-left: auto;
  margin-right: auto;
}
#book .center {
  text-align: center;
}
#book .displaymath {
  text-align: center;
  margin-top: 1em;
  margin-bottom: 1em;
}
#book .caption {
  font-size: 0.85em;
  font-style: italic;
  text-align: center;
  margin-bottom: 3em;
  margin-top: 1em;
}
#book .equation {
  margin-top: 2em;
  margin-bottom: 2em;
}
#book .equation_number {
  float: right;
}
#book table.tabular {
  border-collapse: collapse;
}
#book .tabular th, #book .tabular td {
  padding: 0.5em;
}
#book .tabular th.align_left, #book .tabular td.align_left {
  text-align: left;
}
#book .tabular th.align_center, #book .tabular td.align_center {
  text-align: center;
}
#book .tabular th.align_right, #book .tabular td.align_right {
  text-align: right;
}
#book .tabular th.left_border, #book .tabular td.left_border {
  border-left: 1px solid black;
}
#book .tabular th.right_border, #book .tabular td.right_border {
  border-right: 1px solid black;
}
#book .tabular tr.top_border {
  border-top: 1px solid black;
}
#book .tabular tr.bottom_border {
  border-bottom: 1px solid black;
}
#book .tabular tr.top_border {
  border-top: 1px solid black;
}
#book .footnotes {
  border-top: 1px solid black;
  margin-top: 5em;
  font-size: 90%;
}
#book sup.footnote {
  font-size: 90%;
  margin-right: 2px;
  line-height: 0;
}
#book sup.footnote.intersentence {
  margin-right: 0px;
}
#book sup.footnote a:visited {
  color: #002f72;
}
#book ol.footnotes a.arrow {
  text-decoration: none;
}
#book ol.footnotes.nonumbers li {
  list-style-type: none;
}
#book ul.footnotes.nonumbers li {
  list-style-type: none;
}
#book .footnotes .header {
  padding-top: 1em;
  padding-bottom: 0.5em;
  margin-left: 0.5em;
  font-size: 120%;
  font-weight: bold;
}
#book a.arrow {
  text-decoration: none;
}
#book a:visited.arrow {
  color: #002f72;
}
#book a.section {
  color: #070707;
  text-decoration: none;
}
#book a.heading {
  color: #000;
  text-decoration: none;
}
#book a:hover.heading {
  text-decoration: underline;
}
#book .aside {
  border: 1px solid #999;
  padding: 0.5em;
  background: #eee;
  width: 100%;
}
#book .aside .heading {
  font-weight: bold;
}
#book .highlight {
  width: 100%;
  padding-right: 0.5px;
}
#book .highlight .go {
  color: darkgreen;
}
#book pre {
  line-height: 1.2em;
  font-family: monospace;
}
#book .highlight pre {
  margin: 10px 0 10px 10px;
  font-size: 80%;
  font-weight: bold;
}
#book #table_of_contents {
  margin-top: -1em;
  margin-bottom: 3em;
  margin-left: -1.8em;
}
#book #table_of_contents ul {
  list-style-type: none;
  list-style-position: outside;
  padding-left: 0;
  line-height: 1.2em;
}
#book #table_of_contents li.chapter {
  font-weight: bold;
  padding-top: 1.2em;
}
#book #table_of_contents ul li {
  padding-left: 3.6em;
}
#book #table_of_contents a {
  color: #002f72;
}
#book .navigation {
  font-size: 90%;
  padding-bottom: 2em;
}
#book .navigation .prev_page {
  float: left;
}
#book .navigation .next_page {
  float: right;
}
#book a span.undefined_ref {
  color: red;
}
#book .tt {
  font-family: Courier, monospace;
}
#book .sc {
  font-variant: small-caps;
}
#book .texhtml {
  font-family: "CMU Serif", cmr10, LMRoman10-Regular, "Times New Roman", "Nimbus Roman No9 L", Times, serif !important;
  line-height: 0.5;
}
#book .texhtml .texhtmlA {
  font-size: 70%;
  line-height: 0;
  margin-left: -0.36em;
  margin-right: -0.15em;
  vertical-align: 0.3em;
}
#book .texhtml .texhtmlE {
  margin-left: -0.1667em;
  vertical-align: -0.5ex;
  line-height: 0;
  margin-right: -0.125em;
}
#book span.break {
  display: block;
}
#book h1 span.break {
  display: block;
  margin-top: 0.5em;
}
#book span.intersentencespace {
  margin-right: 0.2em;
}

html, body, div, span, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, code, del, dfn, em, img, q, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, dialog, figure, footer, header, hgroup, nav, section {
  margin: 0;
  padding: 0;
  border: 0;
  font-weight: inherit;
  font-family: inherit;
  font-size: inherit;
}

article, aside, dialog, figure, footer, header, hgroup, nav, section {
  display: block;
}

table {
  border-collapse: separate;
  border-spacing: 0;
}

caption, th, td {
  text-align: left;
  font-weight: normal;
}

table, td, th {
  vertical-align: middle;
}

blockquote:before, blockquote:after {
  content: "";
}

ul, ol {
  margin: 0;
}

q:before, q:after {
  content: "";
}

blockquote, q {
  quotes: "" "";
}

a img {
  border: none;
}

html {
  background-color: #fcf8f1;
  background-image: url("/images/bg.png");
}

body {
  display: flex;
  color: #222;
  flex-direction: column;
  font-family: "proxima-nova", sans-serif;
  font-size: 100%;
  padding-top: 20px;
}
@media only screen and (max-width: 800px) {
  body {
    padding-top: 50px;
  }
}

.center {
  margin: 0 auto;
  text-align: center;
}

.main_content {
  background-image: url("/images/bg_yin.png");
  background-position: top right;
  background-repeat: no-repeat;
  background-size: 35vw;
  box-shadow: 0 0 0 30px #fdfcfa inset;
  padding: 30px 30px 150px;
  position: relative;
  transform: translate(0, 0);
  transition: all 0.3s ease-in-out;
}
@media only screen and (max-width: 800px) {
  .main_content {
    box-shadow: none;
    padding: 30px 1em 5em;
  }
}

h1, h2, h3, h4, h5, h6 {
  font-weight: normal;
  color: #111;
}

h1 {
  font-size: 3em;
  line-height: 1;
  margin-bottom: 0.5em;
}

h2 {
  font-size: 2em;
  margin-bottom: 0.75em;
}

h3 {
  font-size: 1.5em;
  line-height: 1;
  margin-bottom: 1em;
}

h4 {
  font-size: 1.2em;
  line-height: 1.25;
  margin-bottom: 1.25em;
}

h5 {
  font-size: 1em;
  font-weight: bold;
  margin-bottom: 1.5em;
}

h6 {
  font-size: 1em;
  font-weight: bold;
}

h1 img, h2 img, h3 img, h4 img, h5 img, h6 img {
  margin: 0;
}

p ~ p {
  margin: 1em 0 0;
}
p img.left {
  float: left;
  margin: 1.5em 1.5em 1.5em 0;
  padding: 0;
}
p img.right {
  float: right;
  margin: 1.5em 0 1.5em 1.5em;
}

a {
  color: #009;
  text-decoration: underline;
}
a:focus, a:hover {
  color: #000;
}

blockquote {
  margin: 1.5em;
  color: #444;
  font-style: italic;
}
blockquote em {
  font-style: normal;
}
@media only screen and (max-width: 800px) {
  blockquote {
    font-size: 100%;
    margin: 1.5em 0.5em;
  }
}

strong {
  font-weight: bold;
}

em {
  font-style: italic;
}

dfn {
  font-style: italic;
  font-weight: bold;
}

sup, sub {
  line-height: 0;
}

abbr, acronym {
  border-bottom: 1px dotted #666;
}

address {
  margin: 0 0 1.5em;
  font-style: italic;
}

del {
  color: #666;
}

pre {
  margin: 1.5em 0;
  white-space: pre;
  font: 1em "andale mono", "lucida console", monospace;
  line-height: 1.5;
}

code, tt {
  font: 1em "andale mono", "lucida console", monospace;
  line-height: 1.5;
}

dl {
  margin: 0 0 1.5em 0;
}
dl dt {
  font-weight: bold;
}

dd {
  margin-left: 1.5em;
}

table {
  margin-bottom: 1.4em;
  width: 100%;
}

th {
  font-weight: bold;
}

thead th {
  background: #c3d9ff;
}

th, td, caption {
  padding: 4px 10px 4px 5px;
}

tr.even td {
  background: #e5ecf9;
}

tfoot {
  font-style: italic;
}

caption {
  background: #eee;
}

button,
input[type=reset],
input[type=submit],
input[type=button],
.btn {
  box-shadow: 0 3px 0 0 rgba(0, 0, 0, 0.1);
  background-color: #4ca9c2;
  border: 1px solid rgb(95.01875, 178.1375, 200.48125);
  color: #fff;
  cursor: pointer;
  display: inline-block;
  font-family: "proxima-nova", sans-serif;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  line-height: normal;
  padding: 1.3em 1.5em 1.1em;
  text-transform: uppercase;
  transition: all 0.1s linear;
  -webkit-transition: all 0.1s linear;
}
button:hover, button:active,
input[type=reset]:hover,
input[type=reset]:active,
input[type=submit]:hover,
input[type=submit]:active,
input[type=button]:hover,
input[type=button]:active,
.btn:hover,
.btn:active {
  background-color: #666;
  border: 1px solid rgb(114.75, 114.75, 114.75);
}
button:active,
input[type=reset]:active,
input[type=submit]:active,
input[type=button]:active,
.btn:active {
  box-shadow: 0 0 0 0 rgba(0, 0, 0, 0.1);
  transform: translate(0, 3px);
}

label {
  display: block;
  font-family: "proxima-nova", sans-serif;
  font-size: 11px;
  position: relative;
  text-transform: uppercase;
}
label strong.note-required {
  color: #e67642;
  font-size: 2em;
  position: absolute;
  right: 10px;
  top: 25px;
}

fieldset {
  padding: 1.4em;
  margin: 0 0 1.5em 0;
  border: 1px solid #ccc;
}

legend {
  font-weight: bold;
  font-size: 1.2em;
}

input[type=text], input[type=email], input[type=password], textarea, select {
  box-shadow: 0 2px 0 0 rgba(0, 0, 0, 0.05) inset;
  box-sizing: border-box;
  background-color: #fff;
  border: 1px solid rgba(0, 0, 0, 0.3);
  font-family: "proxima-nova", sans-serif;
  font-size: 1rem;
  line-height: normal;
  padding: 0.9em 1em 0.8em;
  width: 100%;
}
input[type=text].mce_inline_error, input[type=email].mce_inline_error, input[type=password].mce_inline_error, textarea.mce_inline_error, select.mce_inline_error {
  border-color: #e67642;
}
input[type=text].mce_inline_error:focus, input[type=email].mce_inline_error:focus, input[type=password].mce_inline_error:focus, textarea.mce_inline_error:focus, select.mce_inline_error:focus {
  box-shadow: 0 2px 0 0 #e67642;
  border-color: #e67642;
}
input[type=text]:focus, input[type=email]:focus, input[type=password]:focus, textarea:focus, select:focus {
  box-shadow: 0 2px 0 0 #4ca9c2;
  border-color: #4ca9c2;
}

.mc-field-group ~ .mc-field-group {
  padding-top: 20px;
}

.submitWr {
  text-align: right;
}

input[type=checkbox], input[type=radio], input.checkbox, input.radio {
  position: relative;
  top: 0.25em;
}

form.inline {
  line-height: 3;
}
form.inline p {
  margin-bottom: 0;
}

.error, .notice, .success {
  padding: 0.8em;
  margin-bottom: 1em;
  border: 2px solid #ddd;
}

.error {
  background: #FBE3E4;
  color: #8a1f11;
  border-color: #FBC2C4;
}

.notice {
  background: #FFF6BF;
  color: #514721;
  border-color: #FFD324;
}

.success {
  background: #E6EFC2;
  color: #264409;
  border-color: #C6D880;
}

.error a {
  color: #8a1f11;
}

.notice a {
  color: #514721;
}

.success a {
  color: #264409;
}

hr {
  background: #ddd;
  color: #ddd;
  clear: both;
  float: none;
  width: 100%;
  height: 0.1em;
  margin: 0 0 1.45em;
  border: none;
}
hr.space {
  background: #fff;
  color: #fff;
  visibility: hidden;
}

.share {
  text-align: center;
}
.share li {
  vertical-align: top;
}
.share li .fb-like > span {
  vertical-align: top !important;
}

.share_horiz {
  display: none;
}

.share_vert {
  display: inline-block;
}

i {
  font-family: "Times New Roman", times, serif;
  font-size: 150%;
  font-style: normal;
  line-height: 1rem;
  text-transform: none;
}

.logo {
  color: #111;
  font-family: times, serif;
  font-size: 70px;
  text-decoration: none;
  text-shadow: 0 0 20px #fdfcfa;
  text-transform: none;
}
.logo:hover {
  color: #e67642;
}

.logo_nav {
  display: inline-block;
  left: 75px;
  font-size: 2.5em;
  line-height: 27px;
  position: relative;
  transition: all 0.3s ease-in-out;
  z-index: 10;
}

.logo_menu {
  visibility: hidden;
}

.nav {
  background-color: #fdfcfa;
  box-sizing: border-box;
  max-height: 95px;
  padding: 10px 0;
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 5;
}

.nav_list,
.nav_sublist {
  list-style: none;
}
.nav_list > li,
.nav_sublist > li {
  margin-top: 0.9em;
  padding-top: 0.9em;
}
.nav_list li ~ li,
.nav_sublist li ~ li {
  border-top: 1px dotted rgba(0, 0, 0, 0.1);
}

.nav_list {
  background-color: #fdfcfa;
  box-sizing: border-box;
  height: 100vh;
  left: 0;
  overflow: scroll;
  padding: 60px 0 0 30px;
  position: fixed;
  text-align: left;
  top: 0;
  transform: translate(-100%, 0);
  transition: all 0.3s ease-in-out;
  width: 30vw;
  z-index: 5;
}
.nav_list > li:first-child {
  margin-top: 0;
}
.nav_list .logo {
  margin-left: 3rem;
}

.nav_heading,
.nav_link {
  display: block;
  font-family: "proxima-nova", sans-serif;
  font-size: 0.85em;
  line-height: 1;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.nav_heading sup,
.nav_link sup {
  margin-left: -3px;
}

.nav_link {
  color: #333;
  text-decoration: none;
}
.nav_link:hover {
  color: #4ca9c2;
}

.email {
  color: #4ca9c2;
}

.buyLnk {
  color: #e67642;
}

.nav_heading {
  color: #999;
  font-weight: 300;
}

.nav_sublist {
  padding-left: 1em;
}
.nav_sublist li:first-child {
  border-top: 0;
}

.hamburger {
  background-color: #fdfcfa;
  border-radius: 3px;
  border: 1px solid #ddd;
  color: #666;
  left: 30px;
  line-height: 1;
  padding: 0.4em 0.45em;
  position: absolute;
  text-decoration: none;
  transition: color 0.2s ease-in-out, background-color 0.2s ease-in-out, top 0.3s ease-in-out;
  top: 10px;
  z-index: 10;
}
.hamburger:hover {
  background-color: #ddd;
  color: #fdfcfa;
}

.nav_open .main_content {
  transform: translate(30vw, 0);
}
.nav_open .nav_list {
  transform: translate(0, 0);
}

@media only screen and (max-width: 800px) {
  .nav_open {
    overflow: hidden;
  }
  .nav {
    padding: 10px 0;
  }
  .logo_nav {
    font-size: 2.5em;
    left: 55px;
    line-height: 27px;
  }
  .hamburger {
    left: 10px;
  }
  .nav_list {
    padding: 60px 0 100px 30px;
    width: 100vw;
  }
}
.announcement {
  border-bottom: 2px solid rgba(76, 169, 194, 0.8);
  box-sizing: border-box;
  color: #fff;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  padding: 2em;
  text-align: center;
}
.announcement .shareButtons,
.announcement .extraNotice {
  flex: 0 0 5em;
  min-width: 5em;
}
.announcement .shareButtons {
  align-self: center;
}
.announcement .buyIcon-text {
  display: none;
}
.announcement .share {
  padding-top: 0;
}
@media only screen and (max-width: 800px) {
  .announcement {
    margin: 0 -1em;
    padding: 0 0 1em;
  }
  .announcement .extraNotice {
    display: none;
  }
  .announcement .ann-buyicon {
    flex: 1 1 50%;
  }
  .announcement .iconEbook,
  .announcement .iconPrint,
  .announcement .iconTee {
    width: 100%;
  }
  .announcement .buyIcon h3 {
    font-size: 3vw;
  }
  .announcement .buyIcon img {
    max-height: 18vw;
    width: unset;
  }
  .announcement .shareButtons {
    flex: 1 1 100%;
    margin-top: 1em;
  }
  .announcement .share_horiz {
    display: inline-block;
  }
  .announcement .share_vert {
    display: none;
  }
}

.ann-buyicon {
  flex: 0 0 auto;
  font-size: 0.7em;
}
.ann-buyicon a {
  font-size: inherit;
}

.notice_bar {
  background-color: rgba(76, 169, 194, 0.8);
  color: #fff;
  line-height: 1;
  padding: 0.4em 1em 0.5em;
  text-align: center;
}
.notice_bar a {
  color: inherit;
  font-size: inherit;
}
.notice_bar a:hover, .notice_bar a:active {
  text-decoration: none;
}
@media only screen and (max-width: 800px) {
  .notice_bar {
    margin: 0 -1em;
  }
}

.footer {
  background-color: #fdfcfa;
  padding: 1em 0 3em;
  text-align: center;
}
.footer .buyIcons {
  justify-content: space-evenly;
  margin: 3em auto 0;
  padding: 0;
}
.footer .buyIcons h3 {
  font-size: 0.75em;
  text-shadow: 0 1px 0 #fdfcfa, 1px 1px 0 #fdfcfa, -1px 1px 0 #fdfcfa, -2px 1px 0 #fdfcfa, 2px 1px 0 #fdfcfa;
}
.footer .buyIcons p {
  display: none;
}
.footer .buyIcons .buylink img {
  max-height: 6em;
}
.footer .share {
  border-top: 1px solid rgba(0, 0, 0, 0.2);
  margin: 3em auto 0;
  padding-top: 20px;
  width: 45%;
}
.footer .share_horiz {
  display: inline-block;
}
.footer .share_vert {
  display: none;
}
.footer .page-email-signup {
  padding: 0;
  margin: 3em auto 0;
  max-width: 40em;
}
@media only screen and (max-width: 800px) {
  .footer .logo {
    font-size: 11vw;
  }
  .footer .page-email-signup {
    margin-top: 4em;
  }
  .footer .share {
    margin: 2em 1em 0;
    width: unset;
  }
  .footer .buyIcons {
    margin-top: 2em;
  }
  .footer .buyIcons li {
    box-sizing: border-box;
    margin: 0;
    max-width: 50%;
  }
  .footer .buy_link img {
    max-height: 4em;
  }
}

.footNav {
  list-style: none;
  padding-top: 20px;
}
.footNav li {
  display: inline-block;
  margin: 0 2px;
}
.footNav li a {
  color: #333;
  padding: 8px 7px 5px;
  text-decoration: none;
  font-family: "proxima-nova", sans-serif;
  font-size: 11.5px;
  text-transform: uppercase;
}
.footNav li a:hover {
  color: #4ca9c2;
}

.container,
body .main_content #book {
  line-height: 1.7;
  margin: 0 auto;
  max-width: 41em;
  width: unset;
  margin-bottom: 5em;
}
.container h1,
body .main_content #book h1 {
  padding-top: 0;
}
.container :target,
body .main_content #book :target {
  scroll-margin-top: 80px;
}

.nonHead h3 {
  font-family: "lust", georgia, serif;
  font-size: 3em;
  margin: 0;
  padding: 120px 0 60px;
  text-align: center;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.6);
}
@media only screen and (max-width: 800px) {
  .nonHead h3 {
    font-size: 7vw;
    margin: 5rem 0 3rem;
    padding: 0;
  }
}

header, #title_page {
  margin: 10em 0 3em;
}
header h1, header h2, header h3, header h5, #title_page h1, #title_page h2, #title_page h3, #title_page h5 {
  font-family: "lust", georgia, serif;
  line-height: 1;
  margin: 0;
  text-align: center;
  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.6);
}
header h1, header h1.title, #title_page h1, #title_page h1.title {
  color: #111;
  font-size: 4em;
}
header h1 a, header h1.title a, #title_page h1 a, #title_page h1.title a {
  color: inherit;
  font-size: inherit;
  text-decoration: none;
}
header h1 a:hover span, header h1 a:active span, header h1.title a:hover span, header h1.title a:active span, #title_page h1 a:hover span, #title_page h1 a:active span, #title_page h1.title a:hover span, #title_page h1.title a:active span {
  box-shadow: 0 9px 0 0 rgba(0, 0, 0, 0.8);
}
@media only screen and (max-width: 800px) {
  header h1 a:hover span, header h1 a:active span, header h1.title a:hover span, header h1.title a:active span, #title_page h1 a:hover span, #title_page h1 a:active span, #title_page h1.title a:hover span, #title_page h1.title a:active span {
    box-shadow: 0 3px 0 0 rgba(0, 0, 0, 0.8);
  }
}
header h1 span, header h1.title span, #title_page h1 span, #title_page h1.title span {
  box-shadow: 0 9px 0 0 rgba(76, 169, 194, 0.3);
  display: block;
  font-size: inherit;
  line-height: 0.8;
}
@media only screen and (max-width: 800px) {
  header h1, header h1.title, #title_page h1, #title_page h1.title {
    font-size: 16vw;
  }
  header h1 span, header h1.title span, #title_page h1 span, #title_page h1.title span {
    box-shadow: 0 3px 0 0 rgba(76, 169, 194, 0.3);
  }
}
header h2, #title_page h2 {
  font-size: 3em;
}
header h3, header h2.author, #title_page h3, #title_page h2.author {
  display: block;
  font-family: "proxima-nova", sans-serif;
  font-size: 1.3em;
  letter-spacing: 0.02em;
}
header h5, #title_page h5 {
  font-size: 1.5em;
}
header h1 + h3, #title_page h1 + h3 {
  padding-top: 20px;
}
header h3 + p, header h2.date, #title_page h3 + p, #title_page h2.date {
  padding-top: 60px;
}
header p, header h2.date, #title_page p, #title_page h2.date {
  font-family: georgia, "Times New Roman", times, serif;
  font-size: 1.1em;
  font-style: italic;
  line-height: 1.2;
  text-align: center;
}
header p a, header h2.date a, #title_page p a, #title_page h2.date a {
  color: #000;
}
header small, #title_page small {
  font-size: 0.6em;
}

.index_text p {
  font-size: 1.2em;
}

.subtitle {
  display: block;
  font-family: "proxima-nova", sans-serif;
  font-size: 1.2rem;
  font-weight: 300;
  letter-spacing: 0.035em;
  padding-bottom: 1.5em;
  text-align: center;
}

.state-of-the-tau {
  font-size: 110%;
}
.state-of-the-tau img {
  display: block;
  margin-left: auto;
  margin-right: auto;
  max-width: 700px;
  width: 90%;
}
.state-of-the-tau h4 {
  font-size: 130%;
}
.state-of-the-tau h5 {
  font-weight: normal;
  font-size: 110%;
  margin-top: 2em;
  margin-bottom: 0.5em;
}

@media screen and (max-width: 800px) {
  header, #title_page {
    margin: 5em 0 2em;
  }
  h1, h1.title {
    font-size: 7vw;
  }
  .notice_separator {
    display: none;
  }
  .email_list:before {
    content: "";
    display: block;
    margin-top: 0.5em;
  }
  .state-of-the-tau img {
    width: 100%;
  }
}
.page {
  font-family: georgia, "Times New Roman", times, serif;
  line-height: 1.6;
}
.page ul, .page ol {
  margin: 0;
  padding: 0;
}
.page ul li ~ li, .page ol li ~ li {
  margin-top: 0.5em;
}
.page p ~ ul, .page p ~ ol {
  margin: 1.5em 1.5em 1.5em 0;
  padding-left: 3.333em;
}
.page ul {
  list-style-type: disc;
}
.page ol {
  list-style-type: decimal;
}
.page ol ul, .page ol ol {
  margin: 0;
}
.page header h3.author {
  margin-top: 1em;
}
@media only screen and (max-width: 800px) {
  .page p ~ ul, .page p ~ ol {
    margin: 1.5em 0;
    padding-left: 1.5em;
  }
}

@media only screen and (max-width: 800px) {
  #book iframe,
  .page iframe {
    height: 71vw;
    width: 100%;
  }
  #book .equation,
  .page .equation {
    box-sizing: border-box;
    font-size: 0.85em;
    width: 100% !important;
  }
  #book .tau_digits,
  .page .tau_digits {
    font-size: 2.7vw;
  }
}
.page-email-signup {
  padding-top: 60px;
}
.page-email-signup label {
  padding-bottom: 10px;
}
.page-email-signup input[type=email] {
  vertical-align: top;
  width: 60%;
}

#ck_success_msg {
  background-color: #4ca9c2;
  padding: 15px;
}
#ck_success_msg p {
  color: #fff;
  font-family: "proxima-nova", sans-serif;
  font-size: 12px;
  margin-bottom: 0 !important;
  text-align: center;
}

#indexAuthor {
  border-top: 1px solid rgba(0, 0, 0, 0.2);
  margin: 5em auto 0;
  padding-top: 5em;
  max-width: 41em;
}
#indexAuthor header {
  margin: 0 0 2em;
  text-align: center;
}
#indexAuthor img {
  border-radius: 999px;
  width: 175px;
}
#indexAuthor h5 {
  color: rgba(17, 17, 17, 0.9);
  padding-top: 20px;
}
#indexAuthor p, #indexAuthor em, #indexAuthor a {
  font-size: 1em;
}
#indexAuthor p {
  color: rgba(0, 0, 0, 0.7);
  line-height: 1.8;
}
#indexAuthor i {
  font-size: 130%;
  line-height: 0;
}
@media only screen and (max-width: 800px) {
  #indexAuthor {
    margin: 3em auto 0;
    padding: 3em 0 0;
    width: unset;
  }
}

.buyIcons {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  list-style: none;
  margin: auto;
  max-width: 900px;
  overflow: hidden;
  padding-top: 80px;
  text-align: center;
}
.buyIcons li {
  vertical-align: top;
  margin: 0 2em;
  max-width: 18em;
}

@media only screen and (max-width: 800px) {
  .container .buyIcons,
  .page .buyIcons {
    font-size: 0.9em;
  }
  .container .buyIcons li,
  .page .buyIcons li {
    flex: 1 1 100%;
    max-width: unset;
  }
  .buyIcons li:first-child {
    margin-bottom: 2.5em;
  }
}
.buyIcon img {
  width: auto;
  height: 20vh;
  max-height: 9em;
}
.buyIcon a {
  text-decoration: none;
}
.buyIcon a:hover h3 {
  color: #e67642;
  -webkit-box-shadow: 0 -2px 0 0 rgba(230, 118, 66, 0.8) inset, 0 1px 0 0 rgba(230, 118, 66, 0.8);
  -moz-box-shadow: 0 -2px 0 0 rgba(230, 118, 66, 0.8) inset, 0 1px 0 0 rgba(230, 118, 66, 0.8);
  box-shadow: 0 -2px 0 0 rgba(230, 118, 66, 0.8) inset, 0 1px 0 0 rgba(230, 118, 66, 0.8);
}
.buyIcon a:hover .iconTee,
.buyIcon a:hover .iconEbook,
.buyIcon a:hover .iconPrint {
  mix-blend-mode: difference;
  opacity: 0.4;
}
.buyIcon p {
  color: #111;
  font-family: georgia, "Times New Roman", times, serif;
  line-height: 1.7;
}
.buyIcon span, .buyIcon em, .buyIcon strong {
  font-size: inherit;
}
.buyIcon h3 {
  color: #4ca9c2;
  display: inline-block;
  font-family: "lust", georgia, serif;
  font-size: 1.15em;
  margin: 1em 0 0.5em;
  mix-blend-mode: darken;
  transition: all 0.25s linear;
  -webkit-transition: all 0.25s linear;
  -webkit-box-shadow: 0 -2px 0 0 rgba(76, 169, 194, 0.3) inset, 0 1px 0 0 rgba(76, 169, 194, 0.3);
  -moz-box-shadow: 0 -2px 0 0 rgba(76, 169, 194, 0.3) inset, 0 1px 0 0 rgba(76, 169, 194, 0.3);
  box-shadow: 0 -2px 0 0 rgba(76, 169, 194, 0.3) inset, 0 1px 0 0 rgba(76, 169, 194, 0.3);
  text-decoration: none;
  text-shadow: 0 1px 0 #f6f2eb, 1px 1px 0 #f6f2eb, -1px 1px 0 #f6f2eb, -2px 1px 0 #f6f2eb, 2px 1px 0 #f6f2eb;
}

.emailSignup {
  font-size: 220%;
}

#book .inline_email ul {
  padding-top: 0;
}

#book .inline_email ul li a {
  box-shadow: 0 0 0 0 rgba(0, 0, 0, 0);
}

#book .inline_email ul li a h3 {
  font-size: 50%;
}

.iconTee,
.iconEbook,
.iconPrint {
  display: inline-block;
}
.iconTee img,
.iconEbook img,
.iconPrint img {
  transition: all 0.25s linear;
}

.buy_link {
  display: grid;
}
.buy_link img {
  max-height: 7em;
  width: auto;
}

.email_list h3 {
  font-size: 0.4em !important;
}

#homeVideo {
  padding-top: 120px;
  max-width: 1080px;
  width: 80%;
}
#homeVideo h2 {
  font-family: "lust", georgia, serif;
  font-size: 2em;
  text-align: center;
}
#homeVideo ul {
  list-style: none;
}
#homeVideo li {
  display: inline-block;
  margin-bottom: 3em;
  text-align: center;
  width: 49%;
}
#homeVideo iframe {
  border: 0;
  margin-bottom: 20px;
  width: 100%;
}
@media only screen and (max-width: 800px) {
  #homeVideo {
    padding-top: 5em;
    width: unset;
  }
  #homeVideo li {
    margin-bottom: 2em;
    width: 100%;
  }
}

.page p a, .page li a, .page div a, #book p a, #book li a, #book div a {
  -webkit-box-shadow: 0 -2px 0 0 rgba(76, 169, 194, 0.3) inset, 0 1px 0 0 rgba(76, 169, 194, 0.3);
  -moz-box-shadow: 0 -2px 0 0 rgba(76, 169, 194, 0.3) inset, 0 1px 0 0 rgba(76, 169, 194, 0.3);
  box-shadow: 0 -2px 0 0 rgba(76, 169, 194, 0.3) inset, 0 1px 0 0 rgba(76, 169, 194, 0.3);
  color: #2b5f6e;
  text-decoration: none;
  text-shadow: 0 1px 0 #f6f2eb, 1px 1px 0 #f6f2eb, -1px 1px 0 #f6f2eb, -2px 1px 0 #f6f2eb, 2px 1px 0 #f6f2eb, 0 2px 0 #f6f2eb;
}
.page p a:hover, .page li a:hover, .page div a:hover, #book p a:hover, #book li a:hover, #book div a:hover {
  -webkit-box-shadow: 0 -2px 0 0 rgba(0, 0, 0, 0.8) inset, 0 1px 0 0 rgba(0, 0, 0, 0.8);
  -moz-box-shadow: 0 -2px 0 0 rgba(0, 0, 0, 0.8) inset, 0 1px 0 0 rgba(0, 0, 0, 0.8);
  box-shadow: 0 -2px 0 0 rgba(0, 0, 0, 0.8) inset, 0 1px 0 0 rgba(0, 0, 0, 0.8);
  color: #333;
}

a.lnkRed {
  -webkit-box-shadow: 0 -2px 0 0 rgba(230, 118, 66, 0.3) inset, 0 1px 0 0 rgba(230, 118, 66, 0.3);
  -moz-box-shadow: 0 -2px 0 0 rgba(230, 118, 66, 0.3) inset, 0 1px 0 0 rgba(230, 118, 66, 0.3);
  box-shadow: 0 -2px 0 0 rgba(230, 118, 66, 0.3) inset, 0 1px 0 0 rgba(230, 118, 66, 0.3);
  color: rgb(216.3785046729, 88.1542056075, 28.6214953271);
  font-size: inherit;
  text-decoration: none;
  text-shadow: 0 1px 0 #f6f2eb, 1px 1px 0 #f6f2eb, -1px 1px 0 #f6f2eb, -2px 1px 0 #f6f2eb, 2px 1px 0 #f6f2eb, 0 2px 0 #f6f2eb;
}
a.lnkRed:hover {
  -webkit-box-shadow: 0 -2px 0 0 rgba(0, 0, 0, 0.8) inset, 0 1px 0 0 rgba(0, 0, 0, 0.8);
  -moz-box-shadow: 0 -2px 0 0 rgba(0, 0, 0, 0.8) inset, 0 1px 0 0 rgba(0, 0, 0, 0.8);
  box-shadow: 0 -2px 0 0 rgba(0, 0, 0, 0.8) inset, 0 1px 0 0 rgba(0, 0, 0, 0.8);
}
a.lnkWhite {
  -webkit-box-shadow: 0 -2px 0 0 rgba(246, 242, 235, 0.3) inset, 0 1px 0 0 rgba(246, 242, 235, 0.3);
  -moz-box-shadow: 0 -2px 0 0 rgba(246, 242, 235, 0.3) inset, 0 1px 0 0 rgba(246, 242, 235, 0.3);
  box-shadow: 0 -2px 0 0 rgba(246, 242, 235, 0.3) inset, 0 1px 0 0 rgba(246, 242, 235, 0.3);
  color: #f6f2eb;
  font-size: inherit;
  text-decoration: none;
  text-shadow: 0 1px 0 #78becf, 1px 1px 0 #78becf, -1px 1px 0 #78becf, -2px 1px 0 #78becf, 2px 1px 0 #78becf;
}
a.lnkWhite:hover {
  -webkit-box-shadow: 0 -2px 0 0 rgba(0, 0, 0, 0.8) inset, 0 1px 0 0 rgba(0, 0, 0, 0.8);
  -moz-box-shadow: 0 -2px 0 0 rgba(0, 0, 0, 0.8) inset, 0 1px 0 0 rgba(0, 0, 0, 0.8);
  box-shadow: 0 -2px 0 0 rgba(0, 0, 0, 0.8) inset, 0 1px 0 0 rgba(0, 0, 0, 0.8);
  color: #000;
}

.feynman-point {
  color: red;
  font-weight: bold;
}

body #book .translation {
  font-style: italic;
  margin-top: 0.3em;
}
body #book .announcement, body #book table.share {
  display: none;
}
body #book h1.title {
  border-top: 0;
}
body #book ul li {
  margin-bottom: 1em;
}
body #book h2 {
  font-size: 1.3em;
  margin-top: 1.5em;
}
body #book h3 {
  font-size: 1.2em;
}
body #book h2, body #book h3, body #book h4 {
  line-height: 1.6;
}
body #book h2 a, body #book h2 span, body #book h3 a, body #book h3 span, body #book h4 a, body #book h4 span {
  font-size: inherit;
}
body #book h2 a, body #book h3 a, body #book h4 a {
  box-shadow: 0 0 0 0 rgba(0, 0, 0, 0);
  font-size: inherit;
  text-decoration: none;
}
body #book h2 a:hover, body #book h3 a:hover, body #book h4 a:hover {
  box-shadow: 0 -2px 0 0 rgba(0, 0, 0, 0.6) inset, 0 1px 0 0 rgba(0, 0, 0, 0.6);
  text-decoration: none !important;
}
body #book h2 a.heading em {
  font-size: 100%;
}
body #book p {
  margin: 0 0 1.5em;
}
body #book .figure .description img {
  border: none;
}
body #book img.pdf {
  float: right;
}
body #book table.tabular {
  width: 50%;
}
body #book .wider table.tabular {
  width: 65%;
}
body #book .date {
  margin-bottom: 2em;
}
body #book div.footnotes ol {
  margin-top: 1em;
}

#manifest .buyIcons {
  padding-top: 100px;
  max-width: 960px;
}
#manifest .buyIcons h3 {
  font-size: 0.75em;
  text-shadow: 0 1px 0 #f6f2eb, 1px 1px 0 #f6f2eb, -1px 1px 0 #f6f2eb, -2px 1px 0 #f6f2eb, 2px 1px 0 #f6f2eb;
}
#manifest .buyIcons p, #manifest .buyIcons p em {
  display: none;
}
#manifest .buyIcons li {
  width: 42%;
}
#manifest .buyIcons li ~ li {
  margin-left: 14%;
}
#manifest .buyIcons .iconEbook {
  height: 53px;
  width: 70px;
}
#manifest .buyIcons .iconPrint {
  height: 53px;
  width: 70px;
}
#manifest .buyIcons .iconTee {
  height: 56px;
  width: 51px;
}

.caption {
  font-size: 0.8em;
  font-style: italic;
}
.caption a, .caption span {
  font-size: inherit;
}

#MathJax_Message {
  display: none;
}

#sec-faq > ul > li {
  list-style: none;
}

.inline_math {
  display: inline-block;
}

#no_math_warning {
  border: 1px solid #e67642;
  border-width: 1px 0;
  color: red;
  font-family: "lust", georgia, serif;
  padding: 2em 0;
  margin: 100px auto 0;
  font-style: italic;
  text-align: center;
  max-width: 700px;
  width: 75%;
}

.user_engagement {
  border-top: 1px solid rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid rgba(0, 0, 0, 0.2);
  margin: 120px auto 0;
  padding-top: 20px;
  width: 400px;
}
.user_engagement h5 {
  font-family: "lust", georgia, serif;
  margin-bottom: 0;
  text-align: center;
}
.user_engagement .share li {
  margin: 0 30px;
}
.user_engagement .field {
  text-align: center;
}
.user_engagement input[type=email] {
  vertical-align: top;
  width: 60%;
}
.user_engagement label {
  padding: 30px 0 10px;
  text-align: center;
}
@media only screen and (max-width: 800px) {
  .user_engagement {
    width: 100%;
  }
}

.read {
  text-align: center;
  font-size: 250%;
  font-style: italic;
}

.youtube-container {
  background-color: #000;
  display: block;
  height: 300px;
  margin: 20px auto;
  max-width: 600px;
  width: 100%;
}

.youtube-player {
  overflow: hidden;
  position: relative;
  width: 100%;
  height: 100%;
  cursor: hand;
  cursor: pointer;
  display: block;
}

#youtube-iframe {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}

img.youtube-thumb {
  bottom: 0;
  display: block;
  left: 0;
  margin: auto;
  max-width: 100%;
  width: 100%;
  position: absolute;
  right: 0;
  top: 0em;
  height: auto;
}

div.play-button {
  height: 72px;
  width: 72px;
  left: 50%;
  top: 50%;
  margin-left: -36px;
  margin-top: -36px;
  position: absolute;
  background: url(https://i.imgur.com/TxzC70f.png) no-repeat;
}

code {
  white-space: pre;
}

h4 {
  margin-top: 2em;
}

.hanging-indentation p {
  font-size: 110%;
  line-height: 1.8;
  margin: auto;
  padding: 0;
  text-align: justify;
  text-indent: 0.95em;
}
.hanging-indentation p:first-of-type {
  text-indent: 0;
}

.heading::before, .footnote-link::before, h4::before {
  content: "";
  display: block;
  height: 50px;
  margin-top: -50px;
  visibility: hidden;
}

span.intersentencespace {
  margin-right: 0.2em;
}

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