:root {
  --color-text: 0, 0, 0;
  --color-background: 255, 255, 255;
  --color-link: 0, 0, 0;
  --type-base: calc(1.6em + 0.5vw);
  --type-xxxx-small: 30%;
  --type-xxx-small: 55%;
  --type-xx-small: 65%;
  --type-x-small: 75%;
  --type-small: 85%;
  --type-medium: 100%;
  --type-large: 120%;
  --type-x-large: 160%;
  --type-xx-large: 200%;
  --type-xxx-large: 300%;
  --type-xxxx-large: 400%; }

@media screen and (min-width: 50em) {
  :root {
    --type-base: calc(0.9em + 0.9vw); } }
@media screen and (min-width: 100em) {
  :root {
    --type-base: 2.75em; } }
@media print {
  :root {
    --type-base: 1.5em; } }
@media (prefers-color-scheme: dark) {
  :root {
    --color-text: 255, 255, 255;
    --color-background: 0, 0, 0;
    --color-link: 255, 255, 255; } }
*,
*:before,
*:after {
  box-sizing: border-box; }

::selection {
  color: rgb(var(--color-background));
  background-color: rgb(var(--color-text)); }

::-moz-selection {
  color: rgb(var(--color-background));
  background-color: rgb(var(--color-text)); }

html {
  font-size: 16px; }
  @supports (display: grid) {
    html {
      font-size: 10px; } }

body {
  margin: 0;
  padding: 0;
  font-family: ff-meta-serif-web-pro, serif;
  font-size: var(--type-base);
  color: rgb(var(--color-text));
  background-color: rgb(var(--color-background));
  overflow-x: hidden; }

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 1.5em 0 0 0;
  padding: 0;
  align-items: center;
  font-size: var(--type-large);
  font-weight: bold;
  line-height: 1.2; }
  h1:hover .anchor-link,
  h2:hover .anchor-link,
  h3:hover .anchor-link,
  h4:hover .anchor-link,
  h5:hover .anchor-link,
  h6:hover .anchor-link {
    opacity: 1; }

h1 {
  font-size: var(--type-xx-large); }
  @media print {
    h1 {
      margin: 0; } }

h2 {
  font-size: var(--type-x-large); }

h3 {
  margin-bottom: -0.25em; }
  h3 + h4 {
    margin-top: 1.5em; }

h4 {
  font-size: var(--type-small);
  margin-top: 1.25em; }
  h4 + p,
  h4 + ol,
  h4 + ul {
    margin-top: 0.2em; }

p {
  margin: 1em 0 0 0;
  font-size: var(--type-medium);
  line-height: 1.5; }

ul,
ol {
  margin: 1em 0 0 1em;
  padding: 0;
  line-height: 1.5; }

ol ul,
ul ul {
  margin-top: 0; }

a {
  color: rgb(var(--color-link)); }
  a:hover {
    color: rgb(var(--color-link)); }
  a:visited {
    color: rgb(var(--color-link)); }

hr {
  height: 0;
  margin: 3em 0;
  border: 0;
  border-top: 0.1rem solid rgb(var(--color-text)); }

blockquote {
  font-style: italic;
  margin: 1em 0 0 0;
  padding: 0 0 0 1em;
  border-left: 0.2rem solid rgb(var(--color-text)); }

code {
  position: relative;
  padding: 0.25rem 0.5rem;
  border-radius: 0.2rem;
  background-color: rgba(var(--color-link), 0.075);
  font-size: var(--type-x-small);
  font-family: SFMono-Regular, Consolas, Liberation Mono, Menlo, Courier, monospace; }

img {
  max-width: 100%;
  border-radius: 1rem; }
  @media print {
    img {
      display: block;
      max-height: 25em;
      margin: 0 auto; } }

figure {
  margin: 1em 0 2em 0;
  break-inside: avoid;
  text-align: center; }

figcaption {
  margin: 0.25em 0 0 0;
  font-size: var(--type-small);
  font-style: italic; }

.wb {
  width: 100%;
  margin: 0 auto;
  padding: 1.5em;
  display: grid;
  grid-template-areas: "header" "sidebar" "content" "footer";
  grid-template-columns: auto; }
  @media screen and (min-width: 50em) {
    .wb {
      margin: 0;
      padding: 2em;
      grid-template-areas: "header header" "sidebar content" "footer footer";
      grid-template-columns: 0.85fr 2.5fr; } }
  @media screen and (min-width: 100em) {
    .wb {
      max-width: 250rem; } }

.landing-title {
  margin: 0 0 0.25em 0;
  font-size: var(--type-xx-large);
  font-weight: bold;
  line-height: 1.1; }
  @media screen and (min-width: 50em) {
    .landing-title {
      font-size: var(--type-xxx-large); } }

.landing-title--large {
  margin: 0;
  font-size: var(--type-xxx-large); }
  @media screen and (min-width: 50em) {
    .landing-title--large {
      font-size: var(--type-xxxx-large); } }

.landing-version {
  font-size: var(--type-xxxx-small);
  font-weight: normal;
  font-style: italic; }

.landing-subtitle {
  margin: 0;
  font-size: var(--type-xx-large);
  line-height: 1.2; }

.landing-author {
  margin: 0;
  font-size: var(--type-small);
  font-style: italic; }

.landing-image {
  display: block;
  margin: 3em 0 1em 0; }
  @media screen and (min-width: 50em) {
    .landing-image {
      margin: 0 0 1em 0; } }

.intro {
  grid-area: sidebar; }

.intro__book-title {
  margin: 0 0 2em 0; }
  @media screen and (min-width: 50em) {
    .intro__book-title {
      margin: 0; } }
  .intro__book-title .icon {
    flex-shrink: 0;
    margin-right: 0.75em; }

.intro__book-title--compact {
  white-space: nowrap;
  font-size: var(--type-small) !important;
  padding: 0.5em 1em !important; }
  .intro__book-title--compact .icon {
    display: none; }

.intro__masthead {
  margin: 2em 0 0 0;
  padding: 0.5em 0 0 0;
  text-transform: uppercase;
  letter-spacing: 0.3rem;
  font-size: var(--type-xx-small); }
  .intro__masthead + .intro__title {
    margin: 0; }

.intro__title {
  margin: 0.58em 0 0 0;
  font-size: var(--type-xx-large); }
  .intro__title a {
    text-decoration: none; }

.intro__sections {
  display: none; }
  @media screen and (min-width: 50em) {
    .intro__sections {
      display: block;
      margin: 0.5em 0 0 0;
      padding: 0;
      list-style-type: none; } }

.intro__section {
  font-size: var(--type-small);
  font-style: italic; }

.intro__next {
  display: none; }
  @media screen and (min-width: 50em) {
    .intro__next {
      display: block;
      font-size: var(--type-small); } }

@media screen and (min-width: 50em) {
  .intro__content {
    position: relative;
    top: 2.5em;
    text-align: center; }
    @supports (display: grid) {
      .intro__content {
        text-align: right; } } }

@media screen and (min-width: 50em) {
  .intro__content--sticky {
    position: -webkit-sticky;
    position: sticky;
    top: 2em; } }

.pagination {
  margin: 0;
  padding: 1em 0 0 0; }

.content {
  margin: 0;
  padding: 0;
  grid-area: content;
  position: relative; }
  @media screen and (min-width: 50em) {
    .content {
      padding: 2.65em 6em 0 3.5em; } }

.footer {
  margin: 4em 0 0 0;
  padding: 1em 0;
  border-top: 0.1rem solid rgb(var(--color-text)); }

.footer__copyright {
  font-size: var(--type-x-small); }

.hidden {
  display: none; }

@media print {
  .hidden-print {
    display: none !important; } }

.sr-only {
  border: 0;
  clip: rect(0 0 0 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px; }

.page-break {
  page-break-before: always; }

.linebreak {
  display: none; }
  @media screen and (min-width: 50em) {
    .linebreak {
      display: block; } }

.warning {
  grid-area: header;
  margin: 0 0 2em 0;
  border: 0.1rem solid rgb(var(--color-text));
  padding: 1em;
  font-size: var(--type-small);
  text-align: center; }
  @supports (display: grid) {
    .warning {
      display: none; } }

.anchor-link {
  display: inline-block;
  width: 0;
  opacity: 0;
  margin-left: 0.125em;
  transition: opacity 0.2s ease-in-out 0.1s;
  text-decoration: none; }

.icon {
  width: 2rem;
  height: 2rem; }
  .icon path {
    fill: rgb(var(--color-text)); }

.icon--twitter {
  width: 2.5rem;
  height: 2.5rem; }
  .icon--twitter path {
    fill: rgb(var(--color-background)); }

.button {
  display: inline-flex;
  align-items: center;
  padding: 0.5em 0.75em;
  border: 0.2rem solid rgb(var(--color-link));
  background-color: rgb(var(--color-link));
  color: rgb(var(--color-background));
  border-radius: 1.25em;
  font-size: inherit;
  font-family: inherit;
  font-weight: bold;
  line-height: 1.25;
  cursor: pointer;
  outline: none;
  text-decoration: none; }
  .button:hover, .button:active, .button:visited {
    color: rgb(var(--color-background)); }
  .button .icon path {
    fill: rgb(var(--color-background)); }

.button--reversed {
  background-color: transparent;
  border: 0; }
  .button--reversed .icon path {
    fill: rgb(var(--color-text)); }
  .button--reversed:hover, .button--reversed:active, .button--reversed:visited {
    background-color: transparent; }

.button--ghost {
  color: rgb(var(--color-text));
  background-color: transparent; }
  .button--ghost .icon path {
    fill: rgb(var(--color-text)); }
  .button--ghost:hover, .button--ghost:active, .button--ghost:visited {
    color: rgb(var(--color-text));
    background-color: transparent; }

.button--hidden {
  display: none; }

.pop {
  display: inline-flex;
  max-width: 20em;
  padding: 0.75em;
  background-color: rgb(var(--color-text));
  color: rgb(var(--color-background));
  border-radius: 0.5rem;
  z-index: 100;
  font-size: var(--type-small);
  font-style: italic;
  transition: opacity 0.1s ease-in-out;
  opacity: 0;
  visibility: hidden; }

.pop--visible {
  opacity: 1;
  visibility: visible; }

.pop__arrow {
  position: absolute;
  width: 0;
  height: 0;
  margin: 0;
  border-style: solid;
  border-width: 0.5rem;
  border-color: transparent; }

.pop[x-placement^="bottom"] {
  margin-top: 0.5rem; }
  .pop[x-placement^="bottom"] .pop__arrow {
    border-top-width: 0;
    border-bottom-color: rgb(var(--color-text));
    top: -0.5rem;
    left: calc(50% - 0.5rem); }

.pop[x-placement^="top"] {
  margin-bottom: 0.5rem; }
  .pop[x-placement^="top"] .pop__arrow {
    border-bottom-width: 0;
    border-top-color: rgb(var(--color-text));
    bottom: -0.45rem;
    left: calc(50% - 0.5rem); }

.modal-open {
  overflow: hidden; }

.menu {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  max-width: 30em;
  overflow-y: auto;
  visibility: hidden;
  padding: 1em 2em;
  opacity: 0;
  background-color: rgba(var(--color-background), 1);
  transition: all 0.3s ease-in-out;
  transform: translate(-100%, 0);
  box-shadow: 0 0 1em 0 rgba(0, 0, 0, 0.1);
  -webkit-overflow-scrolling: touch; }
  @supports (-webkit-backdrop-filter: blur()) {
    .menu {
      -webkit-backdrop-filter: blur(15px);
      background-color: rgba(var(--color-background), 0.6); } }

.menu--show {
  visibility: visible;
  opacity: 1;
  transform: translate(0, 0); }

.menu__close {
  position: absolute;
  top: 1em;
  right: 1em; }

.book-info {
  margin: 0 0 2em 0; }

.book-info__back {
  margin: 0.5em 0 1em 0;
  font-size: var(--type-small); }

.book-info__title {
  margin: 1em 0 0.25em 0;
  font-size: var(--type-xx-large); }

.book-info__subtitle {
  margin: 0;
  font-weight: bold; }

.book-info__author {
  margin: 0;
  font-style: italic; }

.book-info__buy {
  margin: 1em 0 0 0; }

.toc__part-title {
  display: block;
  margin: 2em 0 0 0;
  padding: 0.5em 0 0 0;
  border-top: 0.1rem solid rgb(var(--color-text)); }

.toc__chapters {
  margin: 0;
  padding: 0;
  list-style-type: none; }

.toc__chapter {
  margin: 1em 0 1em 0;
  padding: 0 3em 0 0; }

.toc__chapter-number {
  margin: 3em 0 0 0;
  text-transform: uppercase;
  letter-spacing: 0.3rem;
  font-size: var(--type-xx-small); }
  .toc__chapter-number + .toc__chapter-title {
    margin: 0; }

.toc__chapter-title {
  margin: 2em 0 0 0; }

.toc__chapter-title--compact {
  margin: 0; }

.toc__sections {
  margin: 0.5em 0 0 0;
  padding: 0 0 0 0.5em;
  list-style-type: none;
  border-left: 0.1rem solid rgb(var(--color-link)); }

.toc__section {
  font-size: var(--type-small);
  font-style: italic; }

.glossary__title {
  margin: 2em 0 0 0;
  padding: 0.5em 0 0 0;
  border-top: 0.1rem solid rgb(var(--color-text)); }

.glossary__entry-title {
  margin: 1em 0 0 0;
  font-weight: bold; }

.glossary__entry-definition {
  margin: 0;
  font-size: var(--type-small);
  font-style: italic; }