/* Set the global variables for everything. Change these to use your own fonts and colours. */
:root {

  /* Set sans-serif & mono fonts */
  --sans-font: -apple-system, BlinkMacSystemFont, "Avenir Next", Avenir, "Nimbus Sans L", Roboto, Noto, "Segoe UI", Arial, Helvetica, "Helvetica Neue", sans-serif;
  --mono-font: Consolas, Menlo, Monaco, "Andale Mono", "Ubuntu Mono", monospace;

  /* Body font size. By default, effectively 18.4px, based on 16px as 'root em' */
  --base-fontsize: 1.15rem;

  /* Major third scale progression - see https://type-scale.com/ */
  --header-scale: 1.25;

  /* Line height is set to the "Golden ratio" for optimal legibility */
  --line-height: 1.618;

  /* Default (light) theme */
  --bg: #FFF;
  --accent-bg: #F5F7FF;
  --text: #212121;
  --text-light: #585858;
  --border: #D8DAE1;
  --accent: #0D47A1;
  --accent-light: #90CAF9;
  --code: #D81B60;
  --preformatted: #444;
  --marked: #FFDD33;
  --disabled: #EFEFEF;
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #212121;
    --accent-bg: #2B2B2B;
    --text: #DCDCDC;
    --text-light: #ABABAB;
    --border: #666;
    --accent: #FFB300;
    --accent-light: #FFECB3;
    --code: #F06292;
    --preformatted: #CCC;
    --disabled: #111;
  }

  img, video {
    opacity: .6;
  }
}

html {
  /* Set the font globally */
  font-family: var(--sans-font);
}

/* Make the body a nice central block */
body {
  color: var(--text);
  background: var(--bg);
  font-size: var(--base-fontsize);
  line-height: var(--line-height);
  display: flex;
  min-height: 100vh;
  flex-direction: column;
  flex: 1;
  margin: 0 auto;
  max-width: 45rem;
  padding: 0 .5rem;
  overflow-x: hidden;
  word-break: break-word;
  overflow-wrap: break-word;
}

/* Make the header bg full width, but the content inline with body */
header {
  background: var(--accent-bg);
  border-bottom: 1px solid var(--border);
  text-align: center;
  padding: 2rem .5rem;
  width: 100vw;
  position: relative;
  box-sizing: border-box;
  left: 50%;
  right: 50%;
  margin-left: -50vw;
  margin-right: -50vw;
}


/* Remove margins for header text */
header h1,
header p {
  margin: 0;
}

/* Fix line height when title wraps */
h1, h2, h3 {
  line-height: 1.1;
}

/* Format navigation */
nav {
  font-size: 1rem;
  line-height: 2;
  padding: 1rem 0;
}

nav a {
  margin: 1rem 1rem 0 0;
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text) !important;
  display: inline-block;
  padding: .1rem 1rem;
  text-decoration: none;
  transition: .4s;
}

nav a:hover {
  color: var(--accent) !important;
  border-color: var(--accent);
}

nav a.current:hover {
  text-decoration: none;
}

footer {
  margin-top: 4rem;
  padding: 2rem 1rem 1.5rem 1rem;
  color: var(--text-light);
  font-size: .9rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

/* Format headers */
h1 {
  font-size: calc(var(--base-fontsize) * var(--header-scale) * var(--header-scale) * var(--header-scale) * var(--header-scale));
  margin-top: calc(var(--line-height) * 1.5rem);
}

h2 {
  font-size: calc(var(--base-fontsize) * var(--header-scale) * var(--header-scale) * var(--header-scale));
  margin-top: calc(var(--line-height) * 1.5rem);
}

h3 {
  font-size: calc(var(--base-fontsize) * var(--header-scale) * var(--header-scale));
  margin-top: calc(var(--line-height) * 1.5rem);
}

h4 {
  font-size: calc(var(--base-fontsize) * var(--header-scale));
  margin-top: calc(var(--line-height) * 1.5rem);
}

h5 {
  font-size: var(--base-fontsize);
  margin-top: calc(var(--line-height) * 1.5rem);
}

h6 {
  font-size: calc(var(--base-fontsize) / var(--header-scale));
  margin-top: calc(var(--line-height) * 1.5rem);
}

/* Format links & buttons */
a,
a:visited {
  color: var(--accent);
}

a:hover {
  text-decoration: none;
}

a button,
button,
input[type="submit"],
input[type="reset"],
input[type="button"] {
  border: none;
  border-radius: 5px;
  background: var(--accent);
  font-size: 1rem;
  color: var(--bg);
  padding: .7rem .9rem;
  margin: .5rem 0;
  transition: .4s;
}

a button[disabled],
button[disabled],
input[type="submit"][disabled],
input[type="reset"][disabled],
input[type="button"][disabled],
input[type="checkbox"][disabled],
input[type="radio"][disabled],
select[disabled] {
  cursor: default;
  opacity: .5;
  cursor: not-allowed;
}

input:disabled,
textarea:disabled,
select:disabled {
  cursor: not-allowed;
  background-color: var(--disabled);
}

input[type="range"] {
  padding: 0;
}

/* Set the cursor to '?' while hovering over an abbreviation */
abbr {
  cursor: help;
}

button:focus,
button:enabled:hover,
input[type="submit"]:focus,
input[type="submit"]:enabled:hover,
input[type="reset"]:focus,
input[type="reset"]:enabled:hover,
input[type="button"]:focus,
input[type="button"]:enabled:hover,
input[type="checkbox"]:focus,
input[type="checkbox"]:enabled:hover,
input[type="radio"]:focus,
input[type="radio"]:enabled:hover{
  opacity: .8;
  cursor: pointer;
}

/* Format the expanding box */
details {
  background: var(--accent-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  margin-bottom: 1rem;
}

summary {
  cursor: pointer;
  font-weight: bold;
  padding: .6rem 1rem;
}

details[open] {
  padding: .6rem 1rem .75rem 1rem;
}

details[open] summary {
  margin-bottom: .5rem;
  padding: 0;
}

details[open]>*:last-child {
  margin-bottom: 0;
}

/* Format tables */
table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.5rem 0;
}

td,
th {
  border: 1px solid var(--border);
  text-align: left;
  padding: .5rem;
}

th {
  background: var(--accent-bg);
  font-weight: bold;
}

tr:nth-child(even) {
  /* Set every other cell slightly darker. Improves readability. */
  background: var(--accent-bg);
}

table caption {
  font-weight: bold;
  margin-bottom: .5rem;
}

/* Lists */
ol,
ul {
  padding-left: 3rem;
}

/* Format forms */
textarea,
select,
input {
  font-size: inherit;
  font-family: inherit;
  padding: .5rem;
  margin-bottom: .5rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  box-shadow: none;
  box-sizing: border-box;
  width: 60%;
  -moz-appearance: none;
  -webkit-appearance: none;
  appearance: none;
}

/* Add arrow to  */
select {
  background-image:
    linear-gradient(45deg, transparent 49%, var(--text) 51%),
    linear-gradient(135deg, var(--text) 51%, transparent 49%);
  background-position:
    calc(100% - 20px),
    calc(100% - 15px);
  background-size:
    5px 5px,
    5px 5px;
  background-repeat: no-repeat;
}

select[multiple] {
  background-image: none !important;
}

/* checkbox and radio button style */
input[type="checkbox"], input[type="radio"]{
  vertical-align: bottom;
  position: relative;
}
input[type="radio"]{
  border-radius: 100%;
}

input[type="checkbox"]:checked,
input[type="radio"]:checked {
  background: var(--accent);
}

input[type="checkbox"]:checked::after {
  /* Creates a rectangle with colored right and bottom borders which is rotated to look like a check mark */
  content: ' ';
  width: 0.1em;
  height: 0.25em;
  border-radius: 0;
  position: absolute;
  top: 0.05em;
  left: 0.18em;
  background: transparent;
  border-right: solid var(--bg) 0.08em;
  border-bottom: solid var(--bg) 0.08em;
  font-size: 1.8em;
  transform: rotate(45deg);
}
input[type="radio"]:checked::after {
  /* creates a colored circle for the checked radio button  */
  content: ' ';
  width: .25em;
  height: .25em;
  border-radius: 100%;
  position: absolute;
  top: 0.125em;
  background: var(--bg);
  left: 0.125em;
  font-size: 32px;
}

/* Make the textarea wider than other inputs */
textarea {
  width: 80%
}

/* Makes input fields wider on smaller screens */
@media only screen and (max-width: 720px) {
  textarea,
  select,
  input {
    width: 100%;
  }
}

/* Ensures the checkbox and radio inputs do not have a set width like other input fields */
input[type="checkbox"], input[type="radio"]{
  width: auto;
}

/* do not show border around file selector button */
input[type="file"] {
  border: 0;
}

/* Without this any HTML using <fieldset> shows ugly borders and has additional padding/margin. (Issue #3) */
fieldset {
  border: 0;
  padding: 0;
  margin: 0;
}

/* Misc body elements */

hr {
  color: var(--border);
  border-top: 1px;
  margin: 1rem auto;
}

mark {
  padding: 2px 5px;
  border-radius: 4px;
  background: var(--marked);
}

main img, main video {
  max-width: 100%;
  height: auto;
  border-radius: 5px;
}

figure {
  margin: 0;
}

figcaption {
  font-size: .9rem;
  color: var(--text-light);
  text-align: center;
  margin-bottom: 1rem;
}

blockquote {
  margin: 2rem 0 2rem 2rem;
  padding: .4rem .8rem;
  border-left: .35rem solid var(--accent);
  opacity: .8;
  font-style: italic;
}

cite {
  font-size: 0.9rem;
  color: var(--text-light);
  font-style: normal;
}

/* Use mono font for code like elements */
code,
pre,
pre span,
kbd,
samp {
  font-size: 1.075rem;
  font-family: var(--mono-font);
  color: var(--code);
}

kbd {
  color: var(--preformatted);
  border: 1px solid var(--preformatted);
  border-bottom: 3px solid var(--preformatted);
  border-radius: 5px;
  padding: .1rem;
}

pre {
  padding: 1rem 1.4rem;
  max-width: 100%;
  overflow: auto;
  overflow-x: auto;
  color: var(--preformatted);
  background: var(--accent-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
}

/* Fix embedded code within pre */
pre code {
  color: var(--preformatted);
  background: none;
  margin: 0;
  padding: 0;
}