/* Skip to Content
------------------------------------------------------------------- */

.skip-to-content {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px);
}

.skip-to-content:focus {
  z-index: 10000;
  width: auto;
  height: auto;
  clip: auto;
}


.layout {
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  height: 100vh;
}


/* Navigation
------------------------------------------------------------------- */

#index {
  position: relative;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  padding: 0;
  background-color: #eee;
  counter-reset: nav-counter;
}

  #index p {
    font-size: 1.0rem;
  }

  #index ol {
    list-style-type: none;
    margin: 0;
    padding: 0;
  }

  #index nav {
    display: none;
  }

  #index nav.open {
    display: block;
  }

  #index nav a {
    position: relative;
    display: block;
    border-bottom: 1px solid transparent;
    padding: 0.5rem 2rem;
    padding-left: calc(2rem + env(safe-area-inset-left));
    padding-right: calc(2rem + env(safe-area-inset-right));
    color: #333;
    font-size: 1.0rem;
    font-family: "SF Mono", "SFMono-Regular", "Roboto Mono", Consolas, "Liberation Mono", Menlo, Courier, monospace;
    line-height: 1.2;
    text-decoration: none;
  }

  #index nav a::before {
    display: block;
    margin-bottom: 2px;
    counter-increment: nav-counter;
    content: "Lab " counter(nav-counter);
    opacity: 0.5;
    text-transform: uppercase;
    font-size: 12px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "SF Pro Text", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  }

  #index nav a.active::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 10px;
    left: calc(10px + env(safe-area-inset-left));
    display: block;
    width: 10px;
    height: 10px;
    border-radius: 10px;
    margin-top: -5px;
    background: blue;
  }

  #index nav a:hover {
    color: #fff;
    background: blue;
  }

  #index nav a:hover::before {
    color: #fff;
    opacity: 1;
  }

  #index nav li:last-child a {
    padding-bottom: 2rem;
  }

  #index .link-home {
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    margin: 0;
    padding: 2rem 0;
    z-index: 1;
    background-color: #eee;
  }

  #index .link-home a {
    display: block;
    margin-top: 1rem;
    margin-left: 2rem;
    padding-top: 1rem;
    padding-left: env(safe-area-inset-left);
    color: #333;
    text-decoration: none;
  }

  #index .link-menu {
    position: fixed;
    top: 1rem;
    right: 1rem;
    border: 1px solid #bbb;
    border-radius: 0.25rem;
    padding: 0.25rem 0.75rem;
    font-size: 14px;
    background: #fff;
    z-index: 2;
    transition: all 0.25s;
  }

  #index .link-menu:active {
    color: #000;
    transform: scale(0.9);
  }

  #index .link-home a span {
    border-bottom: 1px solid rgba(0,0,0, 0.15);
    padding-bottom: 3px;
  }


/* Main Content
------------------------------------------------------------------- */

#content {
  position: relative;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  padding: 2rem 2rem 0 2rem;
  padding-left: calc(2rem + env(safe-area-inset-left));
  padding-right: calc(2rem + env(safe-area-inset-right));
  flex-grow: 1;
  counter-reset: content-heading-counter;
  outline: none; 
}

#content p,
#content li, {
  line-height: 125%;
}

#content li {
  margin-bottom: 0.5rem;
}

h1 {
  border-bottom: 1px solid #ccc;
  padding-bottom: 1rem;
  font-size: 2.0rem;
}

  h1 em {
    display: block;
    align-self: center;
    margin: 0 20px 0 0;
    color: #888;
    font-size: 14px;
    font-style: normal;
    text-transform: uppercase;
    line-height: 1;
  }

.file,
.sample {
  overflow: auto;
  display: block;
  margin-bottom: 1em;
  border-radius: 5px;
  padding: 1rem;
  font-size: 14px;
  font-family: "SF Mono", "SFMono-Regular", "Roboto Mono", Consolas, "Liberation Mono", Menlo, Courier, monospace;
  line-height: 1.35;
}

.sample {
  color: #74e83f;
  background: #2E2E2E;
}

.file {
  margin-top: 0;
  margin-bottom: 2rem;
  border: 1px solid #eee;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
  background: #f9f9f9;
}

code {
  border-radius: 3px;
  padding: 1px 3px;
  font-family: "SF Mono", "SFMono-Regular", "Roboto Mono", Consolas, "Liberation Mono", Menlo, Courier, monospace;
  background: #eee;
}

.note {
  display: block;
  min-height: 70px;
  border-top: 1px solid #ccc;
  border-bottom: 1px solid #ccc;
  padding: 1rem 0 1rem 40px;
  line-height: 1.5;
  background-image: url('data:image/svg+xml;utf8,<svg version="1.1" width="36" height="36" viewBox="0 0 36 36" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><path d="M18,2.25a11,11,0,0,0-11,11,10.68,10.68,0,0,0,1,4.63,16.36,16.36,0,0,0,1.12,1.78,17,17,0,0,1,2,3.47,16.19,16.19,0,0,1,.59,4h2A18.17,18.17,0,0,0,13,22.44a18.46,18.46,0,0,0-2.22-3.92,15.79,15.79,0,0,1-1-1.54A8.64,8.64,0,0,1,9,13.23a9,9,0,0,1,18.07,0A8.64,8.64,0,0,1,26.21,17a15.79,15.79,0,0,1-1,1.54A18.46,18.46,0,0,0,23,22.44a18.17,18.17,0,0,0-.71,4.71h2a16.19,16.19,0,0,1,.59-4,17,17,0,0,1,2-3.47A16.31,16.31,0,0,0,28,17.86a10.68,10.68,0,0,0,1-4.63A11,11,0,0,0,18,2.25Z"></path><path d="M18.63,15.51a.8.8,0,0,0-1.13,0l-3,3,2.86,3.13v5.54H19V21l-2.24-2.45,1.89-1.89A.8.8,0,0,0,18.63,15.51Z"></path><path d="M23.86,29.15H12.11a.8.8,0,1,0,0,1.6H23.86a.8.8,0,0,0,0-1.6Z"></path><path d="M22,32.15H14a.8.8,0,1,0,0,1.6H22a.8.8,0,1,0,0-1.6Z"></path><path d="M17.32,10.89l-2.73,2.73a.8.8,0,0,0,1.13,1.13L18.45,12a.8.8,0,1,0-1.13-1.13Z"></path></svg>');
  background-repeat: no-repeat;
  background-position: 0 1rem;
}

h2 {
  padding-top: 1rem;
  color: blue;
  font-size: 1.75rem;
  counter-increment: content-heading-counter;
}

h2 + ul {
  padding-left: 0;
  list-style-type: circle;
}

h3 {
  font-size: 12px;
  font-weight: 400;
  text-transform: uppercase;
}

h3 em {
  font-family: "SF Mono", "SFMono-Regular", "Roboto Mono", Consolas, "Liberation Mono", Menlo, Courier, monospace;
  font-size: 110%;
  font-style: normal;
  text-transform: none;
}

h3 b {
  padding: 2px 6px;
  border-radius: 4px;
  color: #fff;
  background: rgb(150, 150, 150);
}

.file-heading {
  margin-bottom: 0;
  border: 1px solid #eee;
  border-bottom: none;
  border-top-left-radius: 7px;
  border-top-right-radius: 7px;
  padding-top: 1rem;
  padding-left: 1rem;
  padding-bottom: 0.75rem;
  background: #fff;
}

.file-heading.clickable {
  cursor: pointer;
}

.instructions {
  overflow: auto;
}
.instructions pre {
  margin: 0 0 0.5rem 0;
}
.instructions pre::before {
  content: '$';    
  display: inline;
  margin-right: 0.25rem;
  color: green;
  font-weight: bold;
}

.instructions pre:last-of-type {
  margin-bottom: 1.5rem;
}

.instructions .clickable {
  cursor: pointer;
  padding: 2px 0;
  border-radius: 2px;
}

.instructions pre.clickable:hover {
  background: #eee;
}



/* Footer
------------------------------------------------------------------- */

.foot-navigation {
  position: -webkit-sticky;
  position: sticky;
  bottom: 0;
  display: flex;
  width: calc(100% + 4rem);
  margin-left: -2rem;
  background: rgba(255,255,255, 0.95)
}

.foot-navigation > span {
  width: 50%;
}

.foot-navigation a {
  display: flex;
  flex-direction: column;
  width: 50%;
  padding: 1.75rem 2rem 0.75rem 2rem;
  color: #333;
  text-decoration: none;
}

.foot-navigation a:hover {
  color: #fff;
  background: blue;
}

.foot-navigation a:hover svg path {
  fill: #fff;
}

.foot-navigation a svg {
  display: block;
}

.foot-navigation a:first-child svg {
  transform: rotate(-90deg);
}

.foot-navigation a:last-child {
  align-items: flex-end;
}

.foot-navigation a:last-child svg {
  transform: rotate(90deg);
}


/* Desktop Layout Modifiers
------------------------------------------------------------------- */

@media only screen and (min-width: 950px) {
  #content {
    padding-left: 5.5rem;
  }

  .foot-navigation {
    width: calc(100% + 7.5rem);
    margin-left: -5.5rem;
  }

  .layout {
    display: flex;
  }
  
  #index {
    min-width: 340px;
    max-width: 340px;
    flex-shrink: 0;
  }
  
  #index nav {
    display: block;
  }
  
  .link-menu {
    display: none;
  }

  #index .link-home {
    padding-top: 4rem;
  }

  h1 {
    font-size: 2.75rem;
  }

  h2 {
    position: relative;
    font-size: 2.25rem;
  }

  h2::before {
    position: absolute;
    left: -3.5rem;
    display: inline-block;
    width: 2.5rem;
    height: 2.5rem;
    margin-top: 0.05rem;
    border-radius: 2rem;
    line-height: 2.3rem;
    text-align: center;
    color: #fff;
    font-size: 1.5rem;
    background: blue;
    content: counter(content-heading-counter);
  }
}