/* fonts */

@font-face {
    font-family: 'PT Sans';
    src: url('fonts/pt_sans-web-bold.woff2') format('woff2'),
         url('fonts/pt_sans-web-bold.woff') format('woff');
    font-weight: bold;
    font-style: normal;
}

@font-face {
    font-family: 'PT Sans';
    src: url('fonts/pt_sans-web-italic.woff2') format('woff2'),
         url('fonts/pt_sans-web-italic.woff') format('woff');
    font-weight: normal;
    font-style: italic;
}

@font-face {
    font-family: 'PT Sans';
    src: url('fonts/pt_sans-web-regular.woff2') format('woff2'),
         url('fonts/pt_sans-web-regular.woff') format('woff');
    font-weight: normal;
    font-style: normal;
}

@font-face {
    font-family: 'Miriam Libre';
    src: url('fonts/miriamlibre-bold.woff2') format('woff2'),
         url('fonts/miriamlibre-bold.woff') format('woff');
    font-weight: bold;
    font-style: normal;
}

*, *::before, *::after {
  font-family: inherit;
  color: inherit;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: calc(1em + 0.33vw);
  font-family: PT Sans, sans-serif;
  line-height: 1.5;
  color: #111;
}

* + * {
  margin-top: 2.25rem;
}

br,
dt,
dd,
th,
td,
option,
[hidden] + *,
li + li,
body,
.main-and-footer {
  margin-top: 0;
}

p + p {
  margin-top: 0.75rem;
}

a {
  text-decoration: none;
  border-bottom: 1px solid;
}

img {
  max-width: 100%;
}

p img {
  margin: 0.75rem 0;
}

figure p img {
  margin: 0;
}

:focus:not([tabindex="-1"]),
[data-expands]:focus svg,
.patterns a:focus .text {
  outline: 3px solid #ccc;
  outline-offset: 2px;
}

/* fix for IE :( */
div:not([tabindex]):focus {
  outline: none;
}

/* skip link */

[href="#main"] {
  display: block;
  width: 100%;
  padding: 0.75rem;
  color: #fff;
  background: #000;
  position: absolute;
  top: -3rem;
  text-align: center;
  z-index: 1;
}

[href="#main"]:focus {
  top: 0;
  outline: none;
}

/* text styles */

h1, h2, h3, h4 {
  font-family: Miriam Libre, serif;
  line-height: 1.125;
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.66rem;
}

h3 {
  font-size: 1.25rem;
}

h4 {
  font-size: 1rem;
  font-family: PT Sans, sans-serif;
}

kbd {
  line-height: 1;
  font-size: 0.66rem;
  padding: 0.1rem 0.33rem;
  border-radius: 0.25rem;
  border: 2px solid;
  box-shadow: 0.125rem 0.125rem 0 #111;
  vertical-align: 0.33em;
}

pre {
  overflow-x: auto;
  padding: 1.5rem;
  border: 1px solid;
}

code {
  font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
  font-size: 0.85em;
}

.cmd {
  padding: 0.75rem;
  background: #111;
}

.cmd code {
  color: #fff;
  white-space: nowrap;
}

.cmd code::before {
  content: '$';
  font-weight: bold;
  padding-right: 0.25em;
}

.cmd code::after {
  content: '';
  display: inline-block;
  width: 0.75em;
  height: 1.25em;
  background: #fff;
  margin-left: 0.25em;
}

/* Lists */

main ul {
  margin-left: 2.25rem;
}

main li + li {
  margin-top: 0.5rem;
}

main ul ul {
  margin-top: 0;
}

/* Buttons */

button {
  font-size: 1.25rem;
  font-family: inherit;
  font-weight: inherit;
  background: #111;
  color: #fff;
  padding: 0.75rem;
  border: 0;
}

/* Tables */

table {
  text-align: left;
  table-layout: fixed;
  width: 100%;
  border-collapse: collapse;
}

th, td {
  border: 2px solid;
  padding: 0.5rem;
  line-height: 1.25;
  margin: 0;
}

th {
  font-weight: bold;
}

th:empty {
  border: 0;
}

/* Tested using... table */

.tested {
  text-align: center;
}

.tested td {
  vertical-align: top;
}

.tested th {
  background-color: #111;
  border-color: #111;
  color: #fff;
}

.tested img {
  max-width: 3rem;
}

.tested span {
  display: block;
  margin: 0;
}

.tested .additional {
  font-size: 0.85rem;
}

caption {
  font-size: 1.125rem;
  padding-bottom: 0.25rem;
  font-style: italic;
}

/* Page structure */

.wrapper {
  position: relative;
  margin-top: 0;
}

.intro-and-nav {
  font-size: 0.85rem;
  width: 15rem;
  height: 100vh;
  position: fixed;
  top: 0;
  left: 0;
  border-right: 2px solid;
}

.intro-and-nav > div {
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.logo {
  border: 0;
}

.library-desc {
  font-style: italic;
  margin-top: 0.25rem;
  margin-left: auto;
  margin-right: auto;
  max-width: 30rem;
}

.main-and-footer {
  margin-left: 15rem;
}

.main-and-footer > div {
  max-width: 40rem;
  margin: 0 auto;
  padding: 2.25rem;
}

[role="contentinfo"] {
  font-size: 0.85rem;
  margin-top: 4rem;
  text-align: center;
}

/* Patterns navigation */

.patterns {
  overflow: auto;
  margin-top: 1rem;
}

.patterns * {
  margin-top: 0;
}

.patterns h3 {
  font-size: 1rem;
}


.patterns li {
  line-height: 1.125;
  margin-top: 0.75rem;
  list-style: none;
}

.patterns ul ul {
  margin-left: 0.75rem;
}

.pattern a {
  border: 0;
  display: flex;
  flex-wrap: nowrap;
  align-items: baseline;
  font-weight: bold;
}

.pattern a:focus {
  outline: none;
}

.pattern a:focus span {
  outline:
}

.pattern span {
  margin-left: 0.125rem;
}

.pattern [aria-current] span {
  text-decoration: underline;
  text-decoration-skip: ink;
}

/* menu button */

#menu-button {
  display: none;
  width: 100%;
  text-align: center;
}

#menu-button:focus {
  outline: none;
  box-shadow: inset 0 0 0 0.25rem #ccc;
}

/* Pattern lists */

.patterns-list {
  list-style: none;
  margin-left: 0;
}

.patterns-list h2 {
  font-size: 1.25rem;
}

.patterns-list li + li {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 2px solid;
}

.patterns-list a {
  border: 0;
}

/* Tags */

.tags {
  margin-top: 0;
  font-size: 0.85rem;
}

.tags * {
  display: inline;
  margin: 0;
}

.tag-icon {
  height: 1em;
  width: auto;
  vertical-align: middle;
}

.tags strong {
  margin-right: 0.25rem;
}

.tags li {
  white-space: nowrap;
  margin: 0 0.25rem 0 0;
}

/* Notes and warnings */

.note {
  border-left: 0.5rem solid;
  font-size: 0.85rem;
}

.note > div {
  margin-left: 0.75rem;
}

.note > div > img:first-child {
  height: 1.5rem;
}

.note > div > :first-child + * {
  margin-top: 0;
}

.note.warning {
  border-left: 0;
  background-image: url(images/stripe.svg);
  background-size: 0.5rem auto;
  background-repeat: repeat-y;
}

.note.warning > div {
  margin-left: 1.25rem;
}

/* Tick lists */

.ticks li {
  list-style: none;
  position: relative;
}

.ticks li::before {
  content: '';
  display: inline-block;
  width: 1rem;
  height: 1rem;
  margin-right: 0.25rem;
  background-image: url(images/icon-tick.svg);
  background-size: 100% auto;
  position: absolute;
  left: -1.25rem;
  top: 0.25rem;
}

/* Figures */

figure {
  text-align: center;
}

figcaption {
  font-size: 0.85rem;
  font-style: italic;
  margin-top: 0.5rem;
}

main {
  display: block;
  counter-reset: fig;
  min-height: 100vh;
}

figcaption::before {
  counter-increment: fig;
  content: 'Figure ' counter(fig) ':\0020';
  font-weight: bold;
}

/* Code blocks */

pre[class*=language-] {
  background: none;
  margin-top: 2.25rem;
  margin-bottom: 0;
  overflow-y: hidden;
  overflow-x: auto;
}

pre[class*=language-][data-line] {
  padding: 1em 0 0 2.25rem;
}

pre[class*=language-] code * {
  margin-top: 0 !important;
}

[data-codeblock-shortcode] {
  display: block;
  margin-top: -1rem;
}

*:not(pre) > code {
  white-space: nowrap;
}

.token.property,
.token.tag,
.token.boolean,
.token.number,
.token.constant,
.token.symbol,
.token.deleted {
	color: #888;
}

.token.selector,
.token.attr-name,
.token.string,
.token.char,
.token.builtin,
.token.inserted {
	color: #111;
}

.token.operator,
.token.entity,
.token.url,
.language-css .token.string,
.style .token.string {
	color: #333;
	background: none;
}

.token.atrule,
.token.attr-value,
.token.keyword {
	color: #666;
}

.token.function {
	color: #888;
}

.line-numbers code {
  padding-left: 3rem;
  margin-top: -1rem;
  overflow-x: auto;
  overflow-y: hidden;
}

.line-numbers {
  padding: 1.5rem !important;
}

.line-numbers .line-numbers-rows {
  margin-left: 2.25rem;
  left: -3.5em;
  top: 1.25rem;
  color: #111;
  border-color: #111;
}

.line-numbers-rows > span:before {
  color: inherit;
}

/* Expandable sections */

.expandable-section {
  border-top: 1px solid;
  border-bottom: 1px solid;
  padding: 0.75rem 0;
}

[id^="expandable-"] {
  margin: 0;
  padding: 1.5rem 0 0.75rem;
}

.expandable-section + .expandable-section {
  margin-top: 0;
  border-top: 0;
}

[data-expands] {
  text-align: left;
  color: #111;
  border: 0;
  background: none;
  width: 100%;
  padding: 0;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

[data-expands] svg {
  margin-top: 0;
  width: 1em;
  height: 1em;
}

[data-expands][aria-expanded="true"] svg .up-strut {
  display: none;
}

[data-expands]:focus {
  outline: none;
}

p:empty {
  display: none;
}

*:not(p) + p:empty + p {
  margin-top: 2.25rem;
}

/* WCAG and principles */

.wcag ul li {
  font-size: 0.85em;
}

.principles p {
  font-size: 0.85rem;
  margin-top: 0.75rem;
}

.principles.with-desc > li + li,
.wcag.with-desc > li + li {
  border-top: 1px solid;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
}

/* Site errors */

.site-error {
  padding: 1.5rem;
  background: #efefef;
}

.site-error strong {
  color: #C83737;
}

/* SVG icons */

a svg, button svg {
  height: 0.75em;
  width: auto;
  margin-right: 0.125rem;
}

h1 svg {
  vertical-align: -0.5rem;
}

/* color palettes */

.colors {
  display: flex;
  height: 5rem;
  margin: -0.25rem;
  list-style: none;
  flex-wrap: nowrap;
}

.colors li {
  margin: 0.25rem;
  flex: 1 0 auto;
  position: relative;
}

.colors span {
  line-height: 1;
  background-color: #111;
  color: #fff;
  font-size: 0.75rem;
  padding: 0.25rem;
  position: absolute;
  bottom: 0.25rem;
  right: 0.25rem;
}

/* cross references */

.pattern-link {
  font-weight: bold;
}

/* inline demos */

[id^="demo-"] {
  all: initial;
  display: block;
}

@media (max-width: 45em) {

  [role="banner"] {
    position: static;
    width: auto;
    height: auto;
  }

  .intro {
    text-align: center;
  }

  .intro-and-nav > div {
    padding: 1.5rem;
  }

  .logo img {
    max-width: 15rem;
  }

  .main-and-footer {
    margin: 0;
  }

  .patterns h3 {
    font-size: 1.125rem;
    border-top: 4px solid;
    border-bottom: 4px solid;
    padding: 0.75rem 0;
  }

  .patterns ul ul {
    margin: 0;
  }

  .patterns li {
    margin-top: 0;
  }

  .pattern {
    font-size: 1rem;
  }

  .pattern a {
    padding: 0.75rem 0;
  }

  .pattern + .pattern {
    border-top: 1px solid;
  }

  #menu-button {
    display: block;
  }

  #patterns-list {
    display: none;
  }

  [aria-expanded="true"] + #patterns-list {
    display: block;
  }

}
