@charset "UTF-8";

@import url('https://fonts.googleapis.com/css2?family=Gotu&family=Gentium+Plus:ital,wght@0,400;0,700;1,400;1,700&display=swap');


*, *:before, *:after {
  text-rendering: optimizelegibility;
  box-sizing: border-box;
}

:root {
  --base-unit: 5vh;
  --column-width: 50vw;
}

@supports (width: clamp(28px, 5vh, 48px)) {
  :root {
    --base-unit: clamp(28px, 5vh, 48px);
    --column-width: clamp(480px, 50vw, 640px);
  }
}

:root {
  --base-unit-half: calc( var(--base-unit) / 2.0 );
  --body-text-font-stack: "Gentium Plus", serif;
  --heading-text-font-stack: "Gotu", sans-serif;
  --font-size: var(--base-unit-half);
  --line-height: 1.4rem;
  --print-line-height: 1.4rem;
  --vertical-padding: var(--base-unit);
  --column-height: calc(100vh - calc(var(--vertical-padding) * 4.0));
  --column-height: calc(100svh - calc(var(--vertical-padding) * 4.0));
  --column-gap: var(--base-unit);
  --paper-hue: 100;
  --paper-saturation: 50%;
  --paper-lightness: 99%;
  --paper-color: #222222;
  --shade-color-destination: #000000;
  --shade-color-origin: #111111;
  --spot-color: #ffffff;
  --selection-color: #bbbbbb;
  --text-color: #eeeeee;
}

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

/* <button> has some gross defaults */
button {
  touch-action: manipulation;
  background: none;
  background-color: transparent;
  border: none;
  outline: none;
}

html {
  scroll-behavior: smooth;
  overflow: hidden; /* This is the key, always */
  font-size: var(--font-size);
  font-feature-settings: "kern", "liga", "ss11"; /* ss11 gives us the more normal 1 digit in Vollkorn */
}

body {
  height: 100vh; /* So the scrollbar appears at the bottom */
  overflow-x: auto;
  overflow-y: hidden;
  margin: 0;
  padding: var(--vertical-padding) 0 0 0;
  background-color: var(--paper-color);
  font-family: var(--body-text-font-stack);
  font-size: 1rem;
  font-weight: 400;
  text-align: left; /* sigh */
  line-height: var(--line-height);
  color: var(--text-color);
}

div.book div.tutorial {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--line-height);
  break-after: column;
  width: var(--column-width);
  height: calc(var(--column-height) - 1px);
  overflow: hidden;  /* hacky, prevents weird flow problems */
  text-align: center;
}

div.book div.tutorial h2 {
  flex-grow: 0;
  height: auto;
  margin: 0;
  font-family: var(--body-text-font-stack); /* a bit ugly */
}

div.book div.tutorial p {
  flex-grow: 0;
  margin: 0;
  text-indent: 0;
}

button.toc-button {
  position: fixed;
  display: flex;
  flex-direction: column;
  justify-content: center;
  bottom: 0;
  left: 50vw;
  cursor: pointer;
  width: calc( var(--base-unit) * 2.0 );
  height: var(--base-unit);
  transform: translateX(-50%) translateY(-50%);
  background-color: var(--paper-color);
  border: 1px solid var(--text-color);
  color: inherit;
  z-index: 100000;
}

button.toc-button:hover {
  border: 1px solid var(--spot-color);
  color: var(--spot-color);
}

button.toc-button svg {
  flex-grow: 1;
  fill: currentColor;
}

nav {
  position: fixed;
  top: calc( var(--vertical-padding) + var(--base-unit) );
  left: calc( 50vw - var(--column-width) * 0.45);
  width: calc( var(--column-width) * 0.9 ); /* This is all a little bit stupid and I'm sure there's a more principled way to do it */
  height: calc( var(--column-height) - var(--base-unit) );
  overflow-x: hidden;
  overflow-y: hidden;
  background-color: var(--shade-color-origin);
  border: 1px solid var(--spot-color);
  box-shadow: 0 0 var(--base-unit-half) 1px var(--shade-color-destination);
  transition: opacity 0.1s;
  text-align: left;
  z-index: 10000;
}

nav.visible {
  pointer-events: auto;
  opacity: 1.0;
}

nav.invisible {
  pointer-events: none;
  opacity: 0.0;
}

nav div.toc {
  position: relative;
  width: calc( var(--column-width) * 0.9 );
  height: calc( var(--column-height) - var(--base-unit) * 2.0 );
  overflow-x: hidden;
  overflow-y: scroll;
  padding: var(--base-unit);
}

nav div.close-button {
  position: fixed;
  top: calc( var(--vertical-padding) + var(--base-unit) + var(--base-unit));
  right: calc( 50vw + var(--base-unit) - var(--column-width) * 0.45);
  width: var(--base-unit-half);
  height: var(--base-unit-half);
  stroke: var(--spot-color);
  stroke-width: 1px;
}

nav div.close-button:hover {
  cursor: pointer;
}

nav div.controls {
  position: fixed;
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  align-items: center;
  justify-content: center;
  top: calc( var(--vertical-padding) + var(--column-height) - var(--base-unit) * 2.0 ); /* this is getting a bit silly... */
  left: calc( 50vw - var(--column-width) * 0.45);
  width: calc( var(--column-width) * 0.9 );
  height: calc( var(--base-unit) * 2.0 );
  background-color: var(--shade-color-origin);
  border: 1px solid var(--spot-color);
  z-index: 100000;
}

nav div.controls button {
  flex-shrink: 0;
  cursor: pointer;
  width: var(--base-unit);
  height: auto;
  margin: 0 var(--base-unit-half) 0 0;
  padding: 0;
  font-family: -apple-system, system-ui, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  text-align: center;
  color: var(--spot-color);
}

nav div.controls button:last-child {
  margin: 0 0 0 0;
}

nav div.controls button:hover {
  color: var(--text-color);
}

nav h1 {
  width: calc( var(--column-width) * 0.9 - calc( var(--base-unit) * 2.0 ) );
  margin: 0 0 var(--line-height) 0;
  padding: 0;
  font-size: 1rem;
  font-weight: 400;
  line-height: var(--line-height);
}

nav ol {
  width: 90%;
  margin: 0 0 var(--line-height) 0;
  padding: 0;
  list-style-type: none;
}

nav ol li {
  margin: 0 0 var(--line-height) 0;
  font-size: 1rem;
  line-height: var(--line-height);
}

nav ol li:last-of-type {
  margin: 0 0 0 0;
}

div.bookmark {
  position: absolute;
  display: none;
  top: calc( var(--vertical-padding) * -2.5 ); /* now THAT is a magic number */
  left: calc( var(--column-width) / 2.0 );
  width: var(--base-unit);
  height: calc( var(--base-unit) * 2.0 );
  transform: translateX(-50%);
  fill: var(--spot-color);
  z-index: 100000;
}

/* GENERAL STYLES */

h2 {
  margin: calc( var(--line-height) * 6.0 ) 0 calc( var(--line-height) * 2.0 ) 0;
  padding: 0;
  break-before: column;
  font-family: var(--heading-text-font-stack);
  font-size: 1.5rem;
  font-weight: 500;
  line-height: calc( var(--line-height) * 2.0 );
}

a, a:link, a:visited {
  color: var(--spot-color);
}

a:hover, a:active {
  color: var(--text-color);
}

p {
  margin: 0;
  padding: 0;
  text-indent: var(--base-unit-half);
}

span.nobr {
  white-space: nowrap;
}

p.spacetime {
  margin-top: var(--line-height);
  text-indent: 0;
}

small {
  font-size: 1.025rem;
  font-feature-settings: "kern", "liga", "ss11", "smcp";
  font-variant: small-caps;
  font-variant-caps: small-caps;
  hyphens: none;
  text-transform: lowercase;
}

img {
  display: block;
  break-before: column;
  break-after: column;
  width: var(--column-width);
  height: var(--column-height);
  max-height: var(--column-height);
  overflow: hidden;
  object-fit: contain;
}

hr {
  break-after: avoid-column;
  width: 50%;
  margin: var(--base-unit) auto var(--base-unit) auto;
  border: none;
  border-bottom: 1px solid var(--spot-color);
}

p.last-page {
  break-before: column;
}

p.last-page::after {
  display: block;
  height: var(--column-height);
  content: "";
}

blockquote {
  break-before: avoid-column;
  margin: 0;
  padding: var(--base-unit);
  background-color: rgba(0, 0, 0, 0.125);
  font-style: italic;
}

/* BOOK BLOCK LAYOUT */

div.book {
  position: relative;
  column-gap: var(--base-unit);
  column-fill: auto;
  column-count: auto;
  column-width: var(--column-width);
  width: var(--column-width);
  height: var(--column-height);
  margin: var(--base-unit-half);
}

div.book div.title {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--line-height);
  width: var(--column-width);
  height: var(--column-height);
  overflow: hidden; /* hacky, prevents weird flow problems */
  text-align: center;
}

div.book div.title h1 {
  flex-grow: 0;
  height: auto;
  margin: 0;
  padding: 0;
  font-family: var(--heading-text-font-stack);
  font-size: 2rem;
  font-weight: 500;
  font-feature-settings: "kern", "liga", "smcp", "ss11";
  font-variant: small-caps;
  font-variant-caps: small-caps;
  text-transform: lowercase;
  line-height: calc( var(--line-height) * 2.0 );
  color: var(--text-color);
}

div.book div.title h1 span {
  display: block;
}

div.book div.title h2 {
  flex-grow: 0;
  margin: 0;
}

div.book h1 {
  break-before: column;
  overflow: hidden; /* hacky */
  margin: 0;
  padding: 0;
  font-family: var(--heading-text-font-stack);
  font-size: 2rem;
  font-weight: 500;
  font-feature-settings: "kern", "liga", "smcp", "ss11";
  font-variant: small-caps;
  font-variant-caps: small-caps;
  text-align: center;
  text-transform: lowercase;
  line-height: var(--column-height);
  color: var(--spot-color);
}

div.book::before {
  position: fixed;
  top: 0;
  left: 0;
  width: calc( ( 100vw - var(--column-width) - var(--base-unit) ) / 2.0 );
  height: 100vh;
  background: linear-gradient(to right, var(--shade-color-origin) 0%, var(--shade-color-origin) 95%, var(--shade-color-destination) 100%);
  content: "";
  z-index: 1000;
}

div.book::after {
  position: fixed;
  top: 0;
  right: 0;
  width: calc( ( 100vw - var(--column-width) - var(--base-unit) ) / 2.0 );
  height: 100vh;
  background: linear-gradient(to left, var(--shade-color-origin) 0%, var(--shade-color-origin) 95%, var(--shade-color-destination) 100%);
  content: "";
  z-index: 1000;
}

/* PRINT STYLES */
/* This is a mess... */

div.print-cover {
  display: none;
  page-break-after: always;
  width: 100%;
  height: 100%;
}

div.print-cover div.title {
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: 100%;
  height: 100%;
  text-align: center;
}

div.print-cover div.title h1 {
  flex-grow: 0;
  margin: 0;
  padding: 0;
  font-family: var(--heading-text-font-stack);
  font-size: 2rem;
  font-weight: 500;
  font-feature-settings: "kern", "liga", "smcp", "ss11";
  font-variant:small-caps;
  font-variant-caps: small-caps;
  text-transform: lowercase;
  line-height: calc( var(--line-height) * 2.0 );
}

div.print-cover div.title h1 span {
  display: block;
}

div.print-cover div.title h2 {
  flex-grow: 0;
  margin-top: var(--line-height);
}

/* RESPONSIVE STUFF */

@media screen and (max-width: 640px) {
  :root {
    --column-width: calc(100vw - var(--base-unit));
  }

  div.book::before, div.book::after {
    display: none;
  }
}

@media screen and (min-width: 640px) {
  div.book {
    margin-left: calc(50vw - var(--column-width) / 2.0);
  }
}

@media screen and (min-height: 1000px) {
  :root {
    --vertical-padding: calc( var(--base-unit) * 2.0 );
  }

  div.bookmark {
    top: calc( var(--vertical-padding) * -1.5 ); /* Now THAT is a stupid magic number */
  }
}

@media print {
  html {
    width: 100%;
    overflow: auto;
    overflow: visible !important; /* BLERF this fixed a lot of my print style woes */
    font-size: 16pt;
  }

  div.book::before, div.book::after, nav, button.toc-button, img.cover, div.last-page, div.bookmark, div.tutorial {
    display: none;
  }

  div.book div.title {
    display: none;
  }

  @page {
    margin: 1.5in;
  }

  body {
    width: 100%;
    height: auto;
    overflow-x: auto;
    overflow-y: auto;
    background-color: rgb(255, 255, 255);
    line-height: var(--print-line-height);
    color: rgb(0, 0, 0);
  }

  div.print-cover {
    display: block;
  }

  div.book {
    columns: 100% 1;
    column-gap: 0;
    column-fill: auto;
    column-count: 0;
    column-width: auto;
    width: 100%;
    height: auto;
    margin: 0;
  }

  h2 {
    position: relative;
    display: block;
    break-before: page !important; /* This isn't working :( */
    margin-top: 0;
    margin-bottom: var(--print-line-height);
    font-size: 1rem;
    line-height: var(--print-line-height);
  }

  hr {
    break-after: avoid-page !important;
  }

  small {
    font-size: 1.0rem;
    font-weight: 400;
    font-variant: none;
    font-variant-caps: none;
    text-transform: none; /* Small caps weren't working correctly when actually printed, so! */
  }
}
