/* Typography ========================================================================== */

/* The .user-agent class is used to keep the default styling of the tags */

h1:not(.user-agent) {
  text-align: center;
  margin-block-end: 2rem;
}

h1:not(.user-agent),
h2:not(.user-agent),
h3:not(.user-agent) {
  text-transform: uppercase;
}

h1:not(.user-agent),
h2:not(.user-agent),
h3:not(.user-agent),
h4:not(.user-agent),
h5:not(.user-agent),
h6:not(.user-agent) {
  font-size: inherit;
  font-weight: inherit; /* Prevents fake bolding of headings */
}

h2:not(.user-agent) {
  text-align: center;
  margin-block: 1rem;
}

p:not(.user-agent) {
  text-indent: 2ch;
  margin-block: 1rem;
}

p:not(.user-agent):first-child,
ul p:not(.user-agent),
ol p:not(.user-agent),
h1 + p:not(.user-agent),
h2 + p:not(.user-agent),
h3 + p:not(.user-agent) {
  text-indent: 0;
}

strong,
b {
  font-family: "Pelikan Semi Mono";
  font-weight: bold;
}

em,
i {
  font-family: "Pelikan Semi Mono";
  font-style: italic;
}

code {
  font-family: "Pelikan Mono", "Courier New", Courier, monospace;
}

ul li:not(.user-agent) {
  list-style: "– " outside;
}

ul li:not(.user-agent).active {
  list-style: "• " outside;
  color: blue;
}

code {
  border-radius: 0.5rem;
}

*:not(pre) > code,
*:not(pre) > code.hljs {
  background-color: #f0f0f0;
  padding: 0 0.5ch;
}

.wrap {
  white-space: pre-wrap;
}

@media screen and (max-width: calc(600px + 30ch + 10rem)) {
  :root {
    font-size: 1.25rem;
  }
}

/* Lesson layout ======================================================================= */

html {
  scroll-padding-top: 4rem;
  scroll-behavior: smooth;
}

body {
  padding: 0 8px;
  background-color: #fbfbfb;
  font-family: "Pelikan Semi Mono";
  font-feature-settings: "zero";
}

.mobile-only {
  display: none;
}

.lesson-layout {
  display: grid;
  grid-template-columns: 30ch 1fr;
  gap: 1rem;
  max-width: 100vw;
  min-height: 100vh;
}

.sidebar {
  width: 30ch;
}

.sidebar nav {
  max-height: calc(100svh - 2rem);
  /* Hide scrollbar */
  overflow-y: scroll;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.sidebar nav::-webkit-scrollbar {
  display: none;
}

.sidebar h3:not(:first-child) {
  margin-top: 1rem;
}

ul li:not(.user-agent) {
  margin-inline-start: 1.7ch;
}
ul li:not(.user-agent).active {
  position: relative;
  margin-inline-start: 1.65ch;
  padding-left: 0.05ch;
}

/* Short .active transition */

ul li:not(.user-agent).active::before {
  content: "–";
  position: absolute;
  left: -1.5815ch;
  animation: marker-fade-out 100ms ease-in-out forwards;
}

@keyframes marker-fade-out {
  from {
    transform: scale3d(1, 1, 1) translateY(0);
    opacity: 1;
  }
  to {
    transform: scale3d(0.5, 2, 1) translateY(-0.05ch);
    opacity: 0;
  }
}

#top-nav li {
  list-style-type: none;
  border-radius: 0.5rem;
  width: fit-content;
}

#top-nav li a {
  white-space: nowrap;
}

#top-nav li:nth-child(1) {
  list-style: "↖ " outside;
  color: blue;
}

#top-nav li:nth-child(2) {
  list-style: "↓ " outside;
  color: limegreen;
}

#top-nav li:nth-child(3) {
  list-style: "↗ " outside;
  color: deeppink;
}

/* Short active transition */

#top-nav li:nth-child(1).active::before {
  content: "↖ ";
}
#top-nav li:nth-child(2).active::before {
  content: "↓ ";
}
#top-nav li:nth-child(3).active::before {
  content: "↗ ";
}

#top-nav li.active {
  list-style: "• " outside;
}

#top-nav li.active::before {
  position: absolute;
  left: -1.5815ch;
  animation: arrow-marker-fade-out 100ms ease-in-out forwards;
}

@keyframes arrow-marker-fade-out {
  from {
    transform: scale3d(1, 1, 1) translateY(0);
    opacity: 1;
  }
  to {
    transform: scale3d(0.25, 0.25, 1) translateY(0);
    opacity: 0;
  }
}

.sidebar nav,
h1:not(.user-agent) {
  position: sticky;
  top: 1rem;
  height: fit-content;
  padding: 1rem;
  border: solid 1px #efefef;
  border-radius: 1rem;
  background-color: #fefefe;
  z-index: 9;
}

.lesson {
  max-width: calc(100vw - 30ch - 4rem);
  padding-bottom: 8rem;
}

h1:not(.user-agent),
.block-wrapper > * {
  margin: auto;
  width: 100%;
  max-width: 600px;
  font-size: 1rem;
  font-family: inherit;
  margin-block: 1rem;
}

h1:not(.user-agent) {
  width: fit-content;
  padding: 0.25rem 2ch;
  margin: auto;
}

.block-wrapper {
  margin-block: 2rem 1rem;
}

.block-wrapper:last-child {
  border: none;
}

.block-wrapper:not(:first-of-type) h2:not(.user-agent) {
  padding-top: 1rem;
  border-top: solid 1px #000;
}

.block-wrapper h3:not(.user-agent) {
  text-transform: none;
  font-weight: bold;
}

.block-wrapper ul:not(.user-agent),
.block-wrapper ol:not(.user-agent) {
  padding-left: 0; /* Make list flush with the left side of the block */
  margin-bottom: 1rem;
}

/* Only indent lists if the block contains a paragraph */
.block-wrapper:has(p) ul:not(.user-agent):not(.user-agent),
.block-wrapper:has(p) ol:not(.user-agent):not(.user-agent) {
  padding-left: 2ch;
}

.block-wrapper li:not(.user-agent) {
  list-style-position: outside;
}

.lesson a:not(.user-agent) {
  text-decoration: underline;
  text-decoration-style: dotted;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.25ex;
}

.lesson a:not(.user-agent):hover {
  color: #00f;
}

.lesson a:not(.user-agent):has(code) {
  text-decoration: none;
}

.example-toggle,
.example-button {
  display: block;
  padding: 0.5rem 1ch;
  background-color: #dfdfdf;
  border-radius: 0.5rem;
  border: solid 1px #606060;
  color: #606060;
  text-decoration: none;
  width: 18ch;
  text-align: center;
  margin: auto;
  user-select: none;
  cursor: pointer;
  margin-block: 1rem;
  transition: background-color 100ms cubic-bezier(0.4, 0, 0.2, 1),
    border-color 100ms cubic-bezier(0.4, 0, 0.2, 1),
    color 100ms cubic-bezier(0.4, 0, 0.2, 1),
    scale 100ms cubic-bezier(0.4, 0, 0.2, 1);
}

.example-button {
  color: #ffb26b;
  border-color: #ffb26b;
  background-color: #feffaa;
}

.example-toggle:hover,
.example-toggle:has(input:checked),
.example-button:hover,
.example-button:active {
  color: #ff7b00;
  border-color: #ff7b00;
  background-color: #fdff6c;
}

.example-toggle:active,
.example-button:active {
  scale: 0.9;
}

.example-toggle input {
  display: none;
}

pre {
  margin-block: 0;
  border-radius: 0.5rem;
  border: solid 1px #bbb;
}

.block-wrapper > pre {
  margin-bottom: 1rem;
}

pre code {
  display: block;
  padding: 0.5rem 1ch;
  /* Hides the scrollbar */
  -ms-overflow-style: none;
  scrollbar-width: none;
  font-size: 0.875rem;
}

/* Hides the scrollbar on Webkit browsers */
pre code::-webkit-scrollbar {
  display: none;
}

@media screen and (max-width: calc(600px + 30ch + 10rem)) {
  .mobile-only {
    display: inherit;
  }

  .lesson-layout {
    display: flex;
    flex-flow: column nowrap;
    align-items: center;
  }

  #home {
    flex-flow: column-reverse nowrap;
  }

  .sidebar {
    width: 100%;
    margin-top: 1rem;
  }

  #home .sidebar {
    margin-top: 0;
    margin-bottom: 1rem;
  }

  #home .sidebar nav {
    max-height: 500vh;
  }

  .lesson-layout:not(#home) .sidebar nav > *:not(#top-nav, #simple-nav) {
    display: none;
  }

  #simple-nav {
    margin-top: 1rem;
    border-top: solid 1px #efefef;
    padding-top: 1rem;
    display: flex;
    gap: 1ch;
    flex-flow: row wrap;
    justify-content: space-between;
  }
  #simple-nav li {
    position: relative;
    list-style: none;
    flex-grow: 1;
    flex-shrink: 1;
    /* flex-basis: 50%; */
    /* max-width: calc((100% - 3.4ch) / 2); */
  }

  #simple-nav a {
    display: block;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  #simple-nav-previous {
    text-align: left;
    margin-inline: 1.7ch 0;
    flex-shrink: 1;
  }
  #simple-nav-previous::before {
    content: "← ";
    position: absolute;
    left: -1.7ch;
    top: 0;
  }
  #simple-nav-next {
    text-align: right;
    margin-inline: 0 1.7ch;
  }
  #simple-nav-next::after {
    content: " →";
    position: absolute;
    right: -1.7ch;
    top: 0;
  }

  .lesson {
    max-width: 100%;
    padding-bottom: 0;
  }
}

/* Compare block ======================================================================= */

.compare-block {
  display: flex;
  max-width: 90%;
  margin: auto;
  gap: 1rem;
  align-items: center;
  justify-content: center;
  margin-bottom: 1rem;
}

.compare-block > * {
  max-width: 900px;
}

.compare-block-code {
  flex-shrink: 1;
}

.compare-block-code > * {
  margin-block: 0.5rem;
  max-height: 600px;
}

.compare-block:has(> *:nth-child(2)) > * {
  max-width: 50%;
}

.compare-block-code:has(> *:nth-child(2)) > * {
  max-height: 300px;
}

.compare-block-code > span {
  display: block;
  text-align: center;
  margin: 0.5rem;
}

.compare-block-code > *,
.compare-block-result {
  overflow-y: auto;
  /* hide scrollbar */
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.compare-block-code > *::-webkit-scrollbar,
.compare-block-result::-webkit-scrollbar {
  display: none;
}

.compare-block-result {
  min-width: 24rch;
  padding: 1rem;
  border: solid 1px #bbb;
  border-radius: 0.5rem;
}

.compare-block:has(> *:nth-child(2)) .compare-block-result {
  max-height: 600px;
}

@media screen and (max-width: 160ch) {
  .compare-block {
    gap: 0.5rem;
    flex-flow: column nowrap;
    max-width: 100%;
  }

  .compare-block > * {
    max-width: 100% !important;
    flex-basis: 100%;
  }

  .compare-block-code {
    flex-shrink: initial;
    display: flex;
    flex-flow: column nowrap;
    align-items: center;
  }

  .compare-block-code > * {
    margin-block: 0;
  }

  .compare-block-code > *,
  .compare-block-code:has(> *:nth-child(2)) > * {
    max-height: 90svh;
    max-width: 100%;
  }

  .compare-block > span {
    width: fit-content;
    transform: rotate(90deg);
  }

  .compare-block-result {
    max-height: 100%;
  }
}

/* Tip block =========================================================================== */

:root {
  interpolate-size: allow-keywords;
}

.tip-block {
  color: #0b0;
  overflow: hidden;
}

.tip-block::details-content {
  block-size: 0;
  background-color: #dfd;
  border: solid 1px #0b0;
  border-top: none;
  border-bottom-width: 0;
  padding: 0 1ch;
  border-radius: 0 0 0.5rem 0.5rem;
}

.tip-block[open]::details-content {
  block-size: auto;
  border-bottom-width: 1px;
  padding: 0 1ch 0.5rem;
}

.tip-block > summary {
  position: relative;
  width: fit-content;
  padding: 0.5rem 1ch 0.5rem 3ch;
  border-radius: 0.5rem;
  background-color: #dfd;
  border: solid 1px #0b0;
  cursor: pointer;
  user-select: none;
  list-style-type: none;
}

.tip-block > summary::-webkit-details-marker {
  display: none;
}

.tip-block > summary::before {
  content: "→";
  position: absolute;
  left: 1ch;
  transition: transform 75ms cubic-bezier(0.47, 0, 0.745, 0.715);
}

.tip-block[open] > summary {
  width: 100%;
  border-radius: 0.5rem 0.5rem 0 0;
}

.tip-block[open] > summary::before {
  transform: rotate(90deg);
}

/* Transition details opening if supported */
@supports (interpolate-size: allow-keywords) {
  .tip-block::details-content {
    transition: padding 200ms 0ms cubic-bezier(0.55, 0.055, 0.675, 0.19),
      block-size 200ms 0ms cubic-bezier(0.55, 0.055, 0.675, 0.19),
      content-visibility 200ms 0ms cubic-bezier(0.55, 0.055, 0.675, 0.19),
      border-bottom-width 200ms 0ms cubic-bezier(0.55, 0.055, 0.675, 0.19);
    transition-behavior: allow-discrete;
  }
  .tip-block[open]::details-content {
    transition-timing-function: cubic-bezier(0.075, 0.82, 0.165, 1);
    transition-delay: 75ms;
  }
  .tip-block summary {
    transition: width 75ms 200ms cubic-bezier(0.47, 0, 0.745, 0.715),
      border-radius 75ms 200ms cubic-bezier(0.47, 0, 0.745, 0.715);
    transition-behavior: allow-discrete;
  }
  .tip-block[open] summary {
    transition-delay: 0ms;
  }

  .tip-block > summary::before {
    transition-delay: 200ms;
  }

  .tip-block[open] > summary::before {
    transition-delay: 75ms;
  }
}

.tip-block h4 {
  padding-bottom: 0.5rem;
  border-bottom: solid 1px #0b0;
}

.tip-block p {
  text-indent: 0;
  padding-top: 0.5rem;
  margin-block: 0;
}

.tip-block pre {
  margin-top: 0.5rem;
}

.tip-block ol:not(.user-agent),
.tip-block ul:not(.user-agent) {
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

.tip-block ul:not(.user-agent):not(.user-agent),
.tip-block ol:not(.user-agent):not(.user-agent) {
  padding-left: 2.5ch !important;
}

.tip-block a:not(.user-agent):hover {
  color: #040;
}

.tip-block .compare-block {
  margin-block: 0.5rem;
  gap: 0.5rem;
  flex-flow: column nowrap;
}

.tip-block .compare-block > * {
  max-width: 100%;
  flex-basis: 100%;
}

.tip-block .compare-block-code {
  flex-shrink: initial;
  display: flex;
  flex-flow: column nowrap;
  align-items: center;
}

.tip-block .compare-block-code > * {
  margin-block: 0;
}

.tip-block .compare-block-code > *,
.tip-block .compare-block-code:has(> *:nth-child(2)) > * {
  max-height: 90svh;
  max-width: 100%;
}

.tip-block .compare-block > span {
  width: fit-content;
  transform: rotate(90deg);
}

.tip-block .compare-block-result {
  max-height: 100%;
}

/* Further reading ===================================================================== */

.further-reading a:not(.user-agent) {
  display: inline-block;
  padding: 0.5rem 1ch;
  background-color: #d2f2fb;
  border-radius: 0.5rem;
  border: solid 1px #3a6ede;
  color: #3a6ede;
  text-decoration: none;
  width: fit-content;
  margin: auto;
  box-shadow: 0 0 0 #3a6ede;
  transition: background-color 100ms cubic-bezier(0.4, 0, 0.2, 1),
    box-shadow 100ms cubic-bezier(0.4, 0, 0.2, 1),
    transform 100ms cubic-bezier(0.4, 0, 0.2, 1);
}

.further-reading a:hover:not(.user-agent) {
  transform: translate3d(0.25ch, -0.25ch, 0);
  box-shadow: -0.25ch 0.25ch 0 #3a6ede;
  background-color: #aeebfa;
  color: #3a6ede;
}

.further-reading a::after {
  content: " ↗";
}