/* Variables */

:root {
  --body-color: rgb(250,250,250);
  --body-background: rgb(30,40,60);
  --body-font-family: 'Oxygen', sans-serif;
  --body-scrollbar-color: dark;
  --body-margin: 10vw;
  --body-max-width: 1920px;
  --body-div-margin: 0;
  --body-div-padding: 0;
  --body-div-max-width: none;

  --a-color: white;
  --a-text-decoration-color: #09c5f4;

  --code-color: white;
  --code-background: rgba(0,0,0,0.25);
  --code-font-family: 'Oxygen Mono', monospace;

  --kbd-font-family: var(--code-font-family);
  --kbd-border: 1px solid white;

  --var-font-family: var(--code-font-family);
  --var--color: orange;

  --nav-color: black;
  --nav-background: rgba(255,255,255,0.75);
  --nav-padding: 1em 0.5em 1em 0.5em;

  --details-background: rgba(0,0,0,0.25);
  --details-padding: .75em;

  --mark-color: black;
  --mark-background: rgb(239,219,67);

  --img-margin-left: auto;
  --img-margin-right: auto;

  --table-max-width: 500px;
  --table-border: 1px solid white;
  --table-tr-even-background: rgba(255,255,255,0.1);

  --select-border-color: white;
  --select-glyph: url('data:image/svg+xml;charset=utf-8,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23FFFFFF%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E');

  --input-border: 1px solid white;
  --input-max-width: 500px;
  --input-font-size: 1em;
  --input-disabled-background: rgba(255,255,255,.1);

  --button-background: #09c5f4;
  --button-color: white;
}

/* Body */

body {
  margin: 0;
  margin-left: var(--body-margin);
  margin-right: var(--body-margin);
  max-width: var(--body-max-width);
  padding: 0;
  font-family: var(--body-font-family);
  color: var(--body-color);
  background: var(--body-background);
  scrollbar-color: var(--body-scrollbar-color);
  line-height: 1.5;
  text-rendering: optimizeLegibility;
}

body > div {
  margin-left: var(--body-div-margin);
  margin-right: var(--body-div-margin);
  padding-left: var(--body-div-padding);
  padding-right: var(--body-div-padding);
  max-width: var(--body-max-width);
}

@media (max-width: 960px) {
  body {
    margin-left: calc(var(--body-margin) / 2);
    margin-right: calc(var(--body-margin) / 2);
  }

  body > div {
    margin-left: calc(var(--body-div-margin) / 2);
    margin-right: calc(var(--body-div-margin) / 2);
  }
}

/* Text */

h1, h2, h3, h4, h5, h6 {}

pre > code {
  padding: 10px;
  display: block;
  overflow-x: auto;
}

code {
  user-select: all;
  background:  var(--code-background);
  color: var(--code-color);
  font-size: 1em;
  font-family: var(--code-font-family);
  padding: 0.5em;
  border-radius: 5px;
  display: inline-block;
}

kbd {
  font-family: var(--kbd-font-family);
  display: inline-block;
  user-select: all;
  padding: 0.5em;
  border-radius: 5px;
  border: var(--kbd-border);
  font-family: var(--body-font-family);
}

var {
  color: var(--var-color);
  font-style: normal;
  font-family: var(--var-font-family);
}

a {
  color: var(--a-color);
  scroll-behavior: smooth;
  text-decoration: underline;
  text-decoration-color: var(--a-text-decoration-color);
  transition: color .15s ease;
  text-decoration-skip: edges;
  text-decoration-skip-ink: auto;
}

a:hover {
  color: var(--a-text-decoration-color);
}

textarea {
  resize: vertical;
}

details {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  background-color: var(--details-background);
  padding: var(--details-padding) var(--details-padding) 0;
  margin-top: 1em;
  margin-bottom: 1em;
  border-radius: 5px;
  overflow: hidden;
}

details[open] {
  padding: var(--details-padding)
}

details > :last-child {
  margin-bottom: 0;
}

details[open] summary {
  margin-bottom: 10px;
}

summary {
  display: list-item;
  padding: var(--details-padding);
  margin: calc(-1 * var(--details-padding)) calc(-1 * var(--details-padding)) 0;
  user-select: none;
}

details > :not(summary) {
  margin-top: 0;
}

mark {
  background: var(--mark-background);
  color: var(--mark-color);
  padding: 0.15em;
}

/* Navigation */

nav {
  max-width: none;
  margin-left: calc(var(--body-margin) * -1);
  margin-right: calc(var(--body-margin) * -1);
  display: flex;
  flex-wrap: nowrap;
  justify-content: space-around;
  align-items: center;
  width: 100%;
  color: var(--nav-color);
  background: var(--nav-background);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  left: 0;
}

@media (max-width: 960px) {
  nav {
    margin-left: calc(var(--body-margin) * -1 / 2);
    margin-right: calc(var(--body-margin) * -1 / 2);
  }
}

nav * {
  display: block;
  padding: var(--nav-padding);
  color: var(--nav-color);
}

nav a {
  text-decoration: none;
  font-weight: bold;
}

/* Tables */

table {
  border-collapse: collapse;
  display: block;
  width: 100%;
  max-width: var(--table-max-width);
  overflow-x: auto;
}

table > tbody > tr > td, table > tbody > tr > th {
  border: var(--table-border);
  text-align: left;
  padding: 0.5em;
}

table > tbody > tr:nth-child(even) {
  background: var(--table-tr-even-background);
}

table > thead > tr > td, table > thead > tr > th, table > tfoot > tr > td, table > tfoot > tr > th {
  padding: 0.5em;
  border: none;
  text-align: center;
}

/* Images */

img {
  display: block;
  max-width: 100%;
  height: auto;
  margin-left: var(--img-margin-left);
  margin-right: var(--img-margin-right);
}

/* Forms */

fieldset {
  border-radius: 5px;
  border: 1px solid white;
  margin-inline-start: 0;
  margin-inline-end: 0;
  padding-block-start: 0;
  padding-block-end: 0;
  padding-inline-start: 0;
  padding-inline-end: 0;
  padding: 1em;
}

select {
  font-size: var(--input-font-size);
	display: inline-block;
	padding: .5em;
	width: 100%;
	max-width: 500px;
	box-sizing: border-box;
}

select option {
  background: var(--body-background);
	font-weight: normal;
}

select[multiple] {
  color: var(--body-color);
	display: inline-block;
	color: #444;
	padding: 0.5em;
  border-radius: 0;
	width: 100%;
	max-width: 250px;
	box-sizing: border-box;
	border: 1px solid var(--select-border-color);
	background: rgba(0,0,0,.25);
}

select[multiple] > option {
  color: var(--body-color);
  background: rgba(0,0,0,0);
}

@supports(-webkit-appearance: none) or (-moz-appearance: none) or (appearance: none) {
  input[type='checkbox'], input[type='radio'] {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
  }

  select {
    font-size: var(--input-font-size);
    display: inline-block;
    font-size: 1em;
    color: var(--body-color);
    padding: .5em;
    width: 100%;
    max-width: 500px;
    box-sizing: border-box;
    border: 1px solid var(--select-border-color);
    box-shadow: none;
    border-radius: .5em;
    -moz-appearance: none;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(0,0,0,.25);
    background-image: var(--select-glyph);
    background-repeat: no-repeat, repeat;
    background-position: right .7em top 50%, 0 0;
    background-size: .65em auto, 100%;
  }

  select::-ms-expand {
  	display: none;
  }

  select[multiple] {
    color: var(--body-color);
  	display: inline-block;
  	color: #444;
  	padding: 0.5em;
    border-radius: 0;
  	width: 100%;
  	max-width: 250px;
  	box-sizing: border-box;
  	border: 1px solid var(--select-border-color);
  	background: rgba(0,0,0,.25);
  }

  select[multiple] > option {
    color: var(--body-color);
  }
}

input:not([type="submit"]):not([type="checkbox"]):not([type="radio"]):not([type="range"]), textarea {
  font-size: var(--input-font-size);
  color: var(--body-color);
  font-family: var(--body-font-family);
  background: rgba(0,0,0,.25);
  padding: 0.5em;
  width: 100%;
  max-width: var(--input-max-width);
  margin-bottom: 1em;
  box-sizing: border-box;
  resize: none;
  border-radius: 0.5em;
  border: var(--input-border);
}

input:disabled:not([type="submit"]):not([type="checkbox"]):not([type="radio"]):not([type="range"]) {
  background: var(--input-disabled-background);
}

button, select, input[type='submit'], input[type='button'], input[type='checkbox'], input[type='range'], input[type='radio'] {
  cursor: pointer;
}

button, .button {
    display: inline-block;
    border: none;
    padding: 1rem 2rem;
    margin: 0;
    text-decoration: none;
    background: var(--button-background);
    color: var(--button-color);
    font-size: 1em;
    text-align: center;
    transition: background 250ms ease-in-out,
                transform 150ms ease;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

button:hover, button:focus, .button:hover, .button:focus {
    background: #0053ba;
}

button:focus, .button:focus {
    outline: 1px solid #fff;
    outline-offset: -4px;
}

button:active, .button:active {
    transform: scale(0.99);
}

/* Animations */

details[open] summary ~ * {
  animation: sweep 0.1s ease-in-out;
}

@keyframes sweep {
  0%    {opacity: 0; margin-top: -10px; margin-bottom: 10px;}
  90%   {opacity: 1; margin-top: -1px; margin-bottom: 1px;}
  100%  {opacity: 1; margin-top: 0px; margin-bottom: 0;}
}