:root {

  --light-1: rgba(255, 255, 255, 0.1);
  --light-2: rgba(255, 255, 255, 0.2);
  --light-3: rgba(255, 255, 255, 0.3);
  --light-4: rgba(255, 255, 255, 0.4);
  --light-5: rgba(255, 255, 255, 0.5);
  --light-6: rgba(255, 255, 255, 0.6);
  --light-7: rgba(255, 255, 255, 0.7);
  --light-8: rgba(255, 255, 255, 0.8);
  --light-9: rgba(255, 255, 255, 0.9);
  --light: #fff;

  --shade-1: rgba(0, 0, 0, 0.1);
  --shade-2: rgba(0, 0, 0, 0.2);
  --shade-3: rgba(0, 0, 0, 0.3);
  --shade-4: rgba(0, 0, 0, 0.4);
  --shade-5: rgba(0, 0, 0, 0.5);
  --shade-6: rgba(0, 0, 0, 0.6);
  --shade-7: rgba(0, 0, 0, 0.7);
  --shade-8: rgba(0, 0, 0, 0.8);
  --shade-9: rgba(0, 0, 0, 0.9);
  --shade: #000;

  --codepen-gray: #555;
  --codepen-gray-dark: rgb(29, 31, 32);

  --prussian-blue-dark: #003153;
  --prussian-blue-dark-medium: #004880;
  --prussian-blue-medium: #005eaf;
  --prussian-blue-medium-light: #2090df;
  --prussian-blue-light: #40d0ff;
  --prussian-blue-light-white: #aadfea;
  --prussian-blue-white: #efefd0;

  --md-line-color: var(--shade-1);
  --md-fill-color: var(--shade-1);
  --md-em-fill-color: var(--shade-2);
  --md-em-line-color: var(--shade-2);

  --blink-duration: .1s;

  --bar-layout-gutter: 1em;

}

/* Layout */

.-bar-layout>button {
  display: block;
  line-height: 1;
  margin-right: var(--bar-layout-gutter);
}
.-bar-layout>button:last-child {
  margin-right: 0;
}
.-bar-layout {
  display: flex;
}
.-bar-layout>button {
  flex: 1 1 auto;
}
@supports not (display: flex) {
  .-bar-layout {
    display: block;
  }
  .-bar-layout>button {
    float: left;
  }
  .-bar-layout::before,
  .-bar-layout::after {
    content: ' ';
    display: table;
  }
  .-bar-layout::after {
    clear: both;
  }
}

.-centered {
  left: 50%;
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
}

.-clearfix::before,
.-clearfix::after {
  content: ' ';
  display: table;
}
.-clearfix::after {
  clear: both;
}

.-text-block {
  line-height: 1.5;
  padding: 1rem;
}

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

/* Type */

/* fix spaces (css-tricks.com/fighting-the-space-between-inline-block-elements) */
.-inline-block-context {
  font-size: 0;
}
.-inline-block-context > * {
  font-size: 1rem;
}

/* Animation */

@keyframes blink {
  50% {
    opacity: 0;
  }
}
.-blink {
  animation-name: blink;
  animation-duration: var(--blink-duration);
  animation-iteration-count: infinite;
  animation-timing-function: steps(1);
}
.-static .-blink {
  animation-play-state: paused;
}

/* Skin */

.-block-skin {
  background: #f2f2f2;
  border-bottom: 1px dashed lightgray;
  border-top: 1px dashed lightgray;
}

.-card-skin {
  background: var(--light-9);
  border: 1px solid var(--shade-5);
  border-radius: .3rem;
  box-shadow: 0 2px 4px 1px var(--shade-1),
              0 1px 2px var(--shade-2),
              inset 0 0 0 1px var(--light);
  padding: 1rem;
}

.-code-skin {
  background: #ffc;
  border-radius: 4px;
  box-shadow: inset 0 0 0 1px #ff3;
  display: inline-block;
  line-height: 1.5;
  margin: 0 0.3em;
  padding: 0 0.7em;
}

.-pane-skin {
  background: lightgray;
  border: 1px solid gray;
  box-shadow: inset 0 0 0 1px var(--light-5);
  padding: 1rem;
  transition: all 0.3s;
}
.-pane-skin:hover {
  background: yellow;
}

/* Appearance */

.-input-style-none *,
.-input-style-none {
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none;
}

.-show-on-hover,
.-show-on-ready {
  opacity: 0;
  transition: opacity .3s ease-in-out;
}
.-show-on-hover:hover,
.-show-on-ready[data-ready],
.-show-on-ready.ready {
  opacity: 1;
}

.-debug {
  border: 1px solid red;
}

.-invisible {
  opacity: 0;
  position: absolute;
  z-index: -9999;
}

/* UI */

.helper-button {
  background: var(--md-fill-color);
  border-radius: 3px;
  border: 1px solid var(--md-line-color);
  outline: 0;
  padding: .5em .7em;
}
.helper-button:hover {
  border-color: var(--md-em-line-color);
}

label.helper-radio-button,
label.helper-radio-button > span.helper-button {
  display: inline-block;
}
label.helper-radio-button > input[type=radio] {
  visibility: hidden;
  position: absolute;
}
label.helper-radio-button > input[type=radio]:checked + span.helper-button {
  background: var(--md-em-fill-color);
}

hr.helper {
  background: var(--md-line-color);
  border: 0;
  height: 1px;
  margin: 1rem 0;
}

.-graphic {
  user-select: none;
}

/* Prose */

.markdown {
  font-family: 'Helvetica', sans-serif;
  padding: 1rem 2rem;
}
.markdown li,
.markdown blockquote,
.markdown p {
  line-height: 1.333;
}
.markdown blockquote {
  border-left: 4px solid var(--md-line-color);
  margin-left: 18px;
  padding-left: 18px;
}
.markdown figure {
  margin: 0;
}
.markdown hr {
  background-color: var(--md-line-color);
  border: 0;
  height: 1px;
  margin: 2rem 0;
}
.markdown code,
.markdown pre {
  background: var(--md-fill-color);
}
.markdown code {
  padding: .2em .3em;
}
.markdown pre {
  font-size: .9rem;
  line-height: 1.5;
  overflow-x: auto;
  padding: 1rem;
}
.markdown pre code {
  background: transparent;
  padding: 0;
}
.markdown pre:hover,
.markdown pre:focus {
  min-width: min-content;
}
.markdown .-pass {
  color: green;
}
.markdown .-fail {
  color: red;
}

.console > div::before {
  content: '> ';
}

.swatches {
  font-size: 0;
}
.swatches > [data-color] {
  border: 1px solid transparent;
  display: inline-block;
  height: 1rem;
  width: 1rem;
}
.swatches > [data-color]:hover {
  border-color: var(--shade-3);
}

/* Swatch */

[data-palette=prussian-blues] [data-color=dark] {
  background-color: var(--prussian-blue-dark);
}
[data-palette=prussian-blues] [data-color=dark-medium] {
  background-color: var(--prussian-blue-dark-medium);
}
[data-palette=prussian-blues] [data-color=medium] {
  background-color: var(--prussian-blue-medium);
}
[data-palette=prussian-blues] [data-color=medium-light] {
  background-color: var(--prussian-blue-medium-light);
}
[data-palette=prussian-blues] [data-color=light] {
  background-color: var(--prussian-blue-light);
}
[data-palette=prussian-blues] [data-color=light-white] {
  background-color: var(--prussian-blue-light-white);
}
[data-palette=prussian-blues] [data-color=white] {
  background-color: var(--prussian-blue-white);
}