$base-font-size: 16px;
$base-line-height: 1.5;
$__1px: (1px/$base-font-size) * 1rem;
$base-font-family: 'Roboto, Helvetica, sans-serif';
$code-font-family: 'Roboto Mono, Menlo, Consolas, monospace';
$_body-margin: 0;
$fore-color-var: '--fore-color';
$back-color-var: '--back-color';
$secondary-fore-color-var: '--secondary-fore-color';
$secondary-back-color-var: '--secondary-back-color';
$tertiary-fore-color-var: '--tertiary-fore-color';
$border-color-var: '--border-color';
$universal-margin-var: '--universal-margin';
$universal-padding-var: '--universal-padding';
$universal-border-radius-var: '--universal-border-radius';
$fore-color: #212121;
$secondary-fore-color: #444;
$tertiary-fore-color: #222;
$back-color: #fff;
$secondary-back-color: #f0f0f0;
$border-color: #eee;
$token-color-a-var: '--token-color-a';
$token-color-b-var: '--token-color-b';
$token-color-c-var: '--token-color-c';
$token-color-d-var: '--token-color-d';
$token-color-e-var: '--token-color-e';
$token-color-f-var: '--token-color-f';
$token-color-g-var: '--token-color-g';
$token-color-h-var: '--token-color-h';
$token-color-a: #80cbc4;
$token-color-b: #bdbdbd;
$token-color-c: #81d4fa;
$token-color-d: #b388ff;
$token-color-e: #c5e1a5;
$token-color-f: #ff7043;
$token-color-g: #4dd0e1;
$token-color-h: #ffd54f;
$universal-margin: 0.5rem;
$universal-padding: 0.5rem;
$universal-border-radius: 0.125rem;
$heading-line-height: 1.2;
$code-font-size:  0.875em;

@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 300;
  src: local('Roboto Light'), local('Roboto-Light'), url(https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmSU5fBBc4.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
  font-display: swap;
}
@font-face {
  font-family: 'Roboto';
  font-style: italic;
  font-weight: 300;
  src: local('Roboto Light Italic'), local('Roboto-LightItalic'), url(https://fonts.gstatic.com/s/roboto/v18/KFOjCnqEu92Fr1Mu51TjASc6CsQ.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
  font-display: swap;
}
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 500;
  src: local('Roboto Medium'), local('Roboto-Medium'), url(https://fonts.gstatic.com/s/roboto/v18/KFOlCnqEu92Fr1MmEU9fBBc4.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
  font-display: swap;
}
@font-face {
  font-family: 'Roboto Mono';
  font-style: normal;
  font-weight: 300;
  src: local('Roboto Mono Light'), local('RobotoMono-Light'), url(https://fonts.gstatic.com/s/robotomono/v5/L0xkDF4xlVMF-BfR8bXMIjDgiWqxf78.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
  font-display: swap;
}
@font-face {
  font-family: 'Roboto Mono';
  font-style: italic;
  font-weight: 300;
  src: local('Roboto Mono Light Italic'), local('RobotoMono-LightItalic'), url(https://fonts.gstatic.com/s/robotomono/v5/L0xmDF4xlVMF-BfR8bXMIjhOk9a0T72jBg.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
  font-display: swap;
}
@font-face {
  font-family: 'Roboto Mono';
  font-style: normal;
  font-weight: 500;
  src: local('Roboto Mono Medium'), local('RobotoMono-Medium'), url(https://fonts.gstatic.com/s/robotomono/v5/L0xkDF4xlVMF-BfR8bXMIjC4iGqxf78.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
  font-display: swap;
}

:root {
  #{$fore-color-var}: $fore-color;
  #{$back-color-var}: $back-color;
  #{$border-color-var}: $border-color;
  #{$secondary-fore-color-var}: $secondary-fore-color;
  #{$tertiary-fore-color-var}: $tertiary-fore-color;
  #{$secondary-back-color-var}: $secondary-back-color;
  #{$universal-margin-var}: $universal-margin;
  #{$universal-padding-var}: $universal-padding;
  #{$universal-border-radius-var}: $universal-border-radius;
  #{$token-color-a-var}: $token-color-a;
  #{$token-color-b-var}: $token-color-b;
  #{$token-color-c-var}: $token-color-c;
  #{$token-color-d-var}: $token-color-d;
  #{$token-color-e-var}: $token-color-e;
  #{$token-color-f-var}: $token-color-f;
  #{$token-color-g-var}: $token-color-g;
  #{$token-color-h-var}: $token-color-h;
}

html {
  font-size: $base-font-size;
}

html, * {
  font-family: #{$base-font-family};
  line-height: $base-line-height;
  // Prevent adjustments of font size after orientation changes in mobile.
  -webkit-text-size-adjust: 100%;
}
* {
  font-size: 1rem;
  font-weight: 300;
}

a, b, del, em, i, ins, q, span, strong, u {
  font-size: 1em; // Fix for elements inside headings not displaying properly.
}

body {
  margin: $_body-margin;
  color: var(#{$fore-color-var});
  background: var(#{$back-color-var});
  overflow-x: hidden;
}

// Correct display for Edge & Firefox.
details {
  display: block;
}

// Correct display in all browsers.
summary {
  display: list-item;
}

// Abbreviations
abbr[title] {
  border-bottom: none;           // Remove bottom border in Firefox 39-.
  text-decoration: underline dotted;  // Opinionated style-fix for all browsers.
}

// Show overflow in Edge.
input {
  overflow: visible;
}

// Make images responsive by default.
img {
  max-width: 100%;
  height: auto;
}

h1, h2, h3, h4, h5, h6 {
  line-height: $heading-line-height;
  margin: calc(1.5 * var(#{$universal-margin-var})) var(#{$universal-margin-var});
}

h1 {
  font-size: 6rem;
}
h2 {
  font-size: 3.75rem;
}
h3 {
  font-size: 3rem;
}
h4 { 
  font-size: 2.125rem;
}
h5 {
  font-size: 1.5rem;
}
h6 {
  font-size: 1.25rem;
}

p {
  margin: var(#{$universal-margin-var});
}

ol, ul {
  margin: var(#{$universal-margin-var});
  padding-left: calc(2 * var(#{$universal-margin-var}));
}

b, strong {
  font-weight: 500;
}

hr {
  // Fixes and defaults for styling
  box-sizing: content-box;
  border: 0;
  // Actual styling using variables
  line-height: 1.25em;
  margin: var(#{$universal-margin-var});
  height: $__1px;
  background: linear-gradient(to right, transparent, var(#{$border-color-var}) 20%, var(#{$border-color-var}) 80%, transparent);
}

code, kbd, pre {
  font-size: $code-font-size;
}

code, kbd, pre, code *, pre *, kbd *, code[class*="language-"], pre[class*="language-"] {
  font-family: #{$code-font-family}; 
}

sup, sub, code, kbd {
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}

code {
  background: var(#{$secondary-back-color-var});
  padding: calc(var(#{$universal-padding-var}) / 4) calc(var(#{$universal-padding-var}) / 2);
  border-radius: var(#{$universal-border-radius-var});
}

kbd {
  background: var(#{$fore-color-var});
  color: var(#{$back-color-var});
  border-radius: var(#{$universal-border-radius-var});
  padding: calc(var(#{$universal-padding-var}) / 4) calc(var(#{$universal-padding-var}) / 2);
}

pre {
  overflow: auto; // Responsiveness
  padding: calc(1.5 * var(#{$universal-padding-var}));
  margin: var(#{$universal-margin-var});
  background: #263238;
  border: 0;
  color: #fafafa;
}

code[class*="language-"],
pre[class*="language-"] {
  color: var(#{$tertiary-fore-color-var});
  text-align: left;
  white-space: pre;
  word-spacing: normal;
  word-break: normal;
  word-wrap: normal;
  line-height: 1.8;

  -moz-tab-size: 2;
  -o-tab-size: 2;
  tab-size: 2;

  -webkit-hypens: none;
  -moz-hyphens: none;
  -ms-hyphens: none;
  hyphens: none;

  color: #fafafa;
}

pre[class*="language-"] {
  padding: calc(2 * var(#{$universal-padding-var}));
  overflow: auto;
  margin: var(#{$universal-margin-var}) 0;
}

pre[class*="language-"]::-moz-selection, pre[class*="language-"] ::-moz-selection,
code[class*="language-"]::-moz-selection, code[class*="language-"] ::-moz-selection {
  background: #b3d4fc;
}

pre[class*="language-"]::selection, pre[class*="language-"] ::selection,
code[class*="language-"]::selection, code[class*="language-"] ::selection {
  background: #b3d4fc;
}

:not(pre) > code[class*="language-"] {
  padding: .1em;
  border-radius: .3em;
  white-space: normal;
}

.token.comment,
.token.prolog,
.token.doctype,
.token.cdata {
  color: var(#{$token-color-a-var});
}

.token.punctuation {
  color: var(#{$token-color-b-var});
}

.namespace {
  opacity: .7;
}

.token.property,
.token.tag,
.token.boolean,
.token.constant,
.token.symbol,
.token.deleted,
.token.function {
  color: var(#{$token-color-c-var});
}


.token.number,
.token.class-name {
  color: var(#{$token-color-d-var});
}

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted {
  color: var(#{$token-color-e-var});
}

.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string,
.token.atrule,
.token.attr-value,
.token.keyword {
  color: var(#{$token-color-f-var});
}

.token.regex {
  color: var(#{$token-color-g-var});
}
.token.important,
.token.variable {
  color: var(#{$token-color-h-var});
}

.token.important,
.token.bold {
  font-weight: 500;
}
.token.italic {
  font-style: italic;
}

.token.entity {
  cursor: help;
}

/*
blockquote {}
sup {}
sub {}
figure {}
figcaption {}
*/

// ===================================================
// Layout
// ===================================================
$grid-medium-breakpoint: 768px;
$grid-large-breakpoint: 768px;
// Grid container
.container {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  grid-column-gap: calc(0.5 * var(#{$universal-margin-var}));
}
// Generic centered column
.col-centered {
  grid-column: span 12;
  max-width: 100%;
  @media screen and (min-width: #{$grid-medium-breakpoint}) {
    grid-column: 2/12;
  }
  @media screen and (min-width: #{$grid-large-breakpoint}) {
    grid-column: 3/11;
  }
}
// 25% width - For the 'in numbers' section
.col-quarter {
  grid-column: span 3;
}

.col-full-width {
  grid-column: span 12;
}
// For the contributors section
.flex-row {
  display: flex;
  flex: 0 1 auto;
  flex-flow: row wrap;
  .flex-item {
    flex: 0 0 auto;
    max-width: 50%;
    flex-basis: 50%;
    @media screen and (min-width: #{$grid-medium-breakpoint}) {
      max-width: 25%;
      flex-basis: 25%;
    }
    @media screen and (min-width: #{$grid-large-breakpoint}) {
      max-width: 100%;
      flex-grow: 1;
      flex-basis: 0;
    }
  }
}
// TODO: Missing the menu system layout - probably all JS, effects and slide over
// TODO: Redesign cards from scratch

.card {
  &.code-card {
    margin-top: calc(2.5 * var(#{$universal-margin-var}));
    background: #263238;
    .section.card-content{
      background: var(#{$back-color-var});
    }
  }
  overflow: hidden;
  position: relative;
  margin: var(#{$universal-margin-var});
  border-radius: calc(4 * var(#{$universal-border-radius-var}));
  box-shadow: 0 2px 2px 0 rgba(0,0,0,0.14),0 3px 1px -2px rgba(0,0,0,0.12),0 1px 5px 0 rgba(0,0,0,0.2);
  .section {
    &.card-content{
      padding: calc(1.5 * var(#{$universal-padding-var}));
    }
  }
  .collapse {
    background: #263238;
    background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23607D8B' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-plus-square'%3E%3Crect x='3' y='3' width='18' height='18' rx='2' ry='2'%3E%3C/rect%3E%3Cline x1='12' y1='8' x2='12' y2='16'%3E%3C/line%3E%3Cline x1='8' y1='12' x2='16' y2='12'%3E%3C/line%3E%3C/svg%3E");
      background-position: 0.25rem 0.9rem;
      background-repeat: no-repeat;
    text-transform: uppercase;
    padding: calc(1.5 * var(#{$universal-padding-var}));
    padding-left: calc(2.25 * var(#{$universal-padding-var}));
    display: block;
    font-size: 0.75rem;
    padding-bottom: calc(2 * var(#{$universal-padding-var}));
    color: #607D8B;
    cursor: pointer;
    + pre.card-examples {
      position: absolute;
      transform: scaleY(0);    
      transform-origin: top;
      transition: transform 0.2s ease;
    }
    &.toggled{
      background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23607D8B' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-minus-square'%3E%3Crect x='3' y='3' width='18' height='18' rx='2' ry='2'%3E%3C/rect%3E%3Cline x1='8' y1='12' x2='16' y2='12'%3E%3C/line%3E%3C/svg%3E");
      padding-bottom: calc(0.125 * var(#{$universal-padding-var}));
      + pre.card-examples {
        position: relative;
        transform: scaleY(1);
      }
    }
  }
  pre.section {
    &.card-code {
      position: relative;
      margin-bottom: 0;
      padding-bottom: 0;
    }
    &.card-examples {
      margin-top: 0;
      margin-bottom: 0;
      border-radius: 0 0 calc(4 * var(#{$universal-border-radius-var})) calc(4 * var(#{$universal-border-radius-var}));
      padding-top: 0;
      &:before {
        content: '';
        display: block;
        position: absolute;
        top: 0;
        left: 9px;
        border-left: 1px solid #607D8B;
        height: calc(100% - 18px);
      }
    }
  }
  h4 {
    text-align: center;
    padding-bottom: calc(0.75 * var(#{$universal-padding-var}));
    margin-bottom: calc(2 * var(#{$universal-margin-var}));
    border-bottom: $__1px solid var(#{$border-color-var});
  }
  .copy-button-container {
    position: relative;
    z-index: 2;
    .copy-button {
      background: #1E88E5;
      background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23f0f0f0' stroke-width='2' stroke-linecap='round' stroke-linejoin='round' class='feather feather-clipboard'%3E%3Cpath d='M16 4h2a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h2'%3E%3C/path%3E%3Crect x='8' y='2' width='8' height='4' rx='1' ry='1'%3E%3C/rect%3E%3C/svg%3E");
      background-position: center center;
      background-repeat: no-repeat;
      box-sizing: border-box;
      padding: calc(2.5 * var(#{$universal-padding-var}));
      border-radius: 50%;
      position: absolute;
      border: 0;
      top: -1.75rem;
      right: 0;
      margin: calc(2 * var(#{$universal-margin-var}));
      box-shadow: 0 2px 2px 0 rgba(0,0,0,0.14),0 3px 1px -2px rgba(0,0,0,0.12),0 1px 5px 0 rgba(0,0,0,0.2);
      transition: all 0.3s ease;
      cursor: pointer;
      &:hover {
        background-color: #2196F3;
        box-shadow: 0 4px 5px 0 rgba(0,0,0,0.14),0 1px 10px 0 rgba(0,0,0,0.12),0 2px 4px -1px rgba(0,0,0,0.3);
      }
      &:before {
        background: #fff;
        position: absolute;
        top: -4px;
        right: -4px;
        content: '';
        display: block;
        box-sizing: border-box;
        padding: calc(2.5 * var(#{$universal-padding-var}));
        border-radius: 50%;
        border: 4px solid #fff;
        z-index: -1;
      }
    }
  }
}

.advanced-corner {
    text-align: center;
    //text-transform: uppercase;
    box-sizing: border-box;
    padding-top: 32px;
    font-size: 0.75rem;
    position: absolute;
    top: -8px;
    right: -34px;
    transform: rotate(45deg);
    color: #fff;
    font-weight: 500;
    width: 104px;
    height: 52px;
    background: #E53935;
    box-shadow: 0 2px 2px 0 rgba(0,0,0,0.07),0 3px 1px -2px rgba(0,0,0,0.06),0 1px 5px 0 rgba(0,0,0,0.1);
}

.toast {
  position: fixed;
  bottom: calc(var(#{$universal-margin-var}) * 2);
  margin-bottom: 0;
  font-size: 0.8125rem;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1111;
  color: #fff;
  background: #212121;
  border-radius: calc(var(#{$universal-border-radius-var}) * 16);
  padding: var(#{$universal-padding-var}) calc(var(#{$universal-padding-var}) * 2);
  box-shadow: 0 2px 2px 0 rgba(0,0,0,0.14),0 3px 1px -2px rgba(0,0,0,0.12),0 1px 5px 0 rgba(0,0,0,0.2);
  }

// TODO: Links colors

// TODO: Buttons and search form only
// TODO: Top bar - header
// TODO: Side bar - nav
// TODO: Bottom area - footer
// TODO: JS + CSS for side bar functionality
// TODO: New toast
// TODO: New marks
// TODO: Components for statistics

header h1.logo {
  margin-top: 0rem;
  font-size: 1.625rem;
  text-align: center;
  position: relative;
  top: 0;
  transition: top 0.3s;
  color: #111;
}

h1 a, h1 a:link, h1 a:visited {
  text-decoration:none;
  color: #111;
  &:hover, &:focus {
    text-decoration:none;
    color: #111;
  }
}

header #title {
  position:relative;
  top: -1.125rem;
  @media screen and (max-width: 768px) { display: none; }
}

header {
  z-index: 5;
  position: fixed;
  width: 110%;
  left: -5%;
  background: linear-gradient(
    135deg,
    #ffb300 0%,
    #ec407a 100%
  );
  box-shadow: 0 2px 4px rgba(0,0,0,.5);
}

header h1 small {
  display:block;
  font-size: 0.875rem;
  color: #888;
  margin-top: 0.75rem;
}

.github-corner:hover .octo-arm{animation:octocat-wave 560ms ease-in-out}@keyframes octocat-wave{0%,100%{transform:rotate(0)}20%,60%{transform:rotate(-25deg)}40%,80%{transform:rotate(10deg)}}@media (max-width:500px){.github-corner:hover .octo-arm{animation:none}.github-corner .octo-arm{animation:octocat-wave 560ms ease-in-out}}

header {
  background: #202124;
  h1 a, h1 a:link, h1 a:visited {
    color: #fff;
    &:hover, &:focus {
      color: #fff;
    }
  }
}
footer {
  color: #616161;
  * {
    font-size: 0.875rem;
  }
  padding-top: calc(2 * var(#{$universal-padding-var}));
  padding-bottom: calc(3 * var(#{$universal-padding-var}));
  margin-top: calc(6 * var(#{$universal-margin-var}));
  background: #e0e0e0;
}