/* Global variables. */
:root {
    --font-family: var(--sans-font);
    --serif-font:
        Constantia, "Lucida Bright", Lucidabright, "Lucida Serif", Lucida,
        "DejaVu Serif", "Bitstream Vera Serif", "Liberation Serif", Georgia,
        serif;
    --sans-font:
        -apple-system, "BlinkMacSystemFont", "Avenir", "Avenir Next",
        "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans",
        "Droid Sans", "Helvetica Neue", sans-serif;
    --mono-font:
        Consolas, "Andale Mono WT", "Andale Mono", "Lucida Console",
        "Lucida Sans Typewriter", "DejaVu Sans Mono",
        "Bitstream Vera Sans Mono", "Liberation Mono", "Nimbus Mono L", Monaco,
        "Courier New", Courier, monospace;
    --brand-font: "Bebas Neue";
    --fancy-font: "Pacifico";
    --slab-font: "Holtwood One SC", serif;

    /* Default (light) theme */
    --bg: var(--gradient);
    --accent-bg: #ccedf5;
    --text: var(--carbon);
    --text-light: var(--darkGrey);
    --border: var(--gray);
    --primary: var(--blue);
    --secondary: var(--slate);
    --primary-hover: var(--green);
    --accent-text: var(--bg);
    --code: var(--red);
    --preformatted: var(--graphite);
    --marked: var(--yellow);
    --disabled: var(--offWhite);

    --white: #f6f7f8;
    --offWhite: #efefef;
    --black: #191919;
    --carbon: #292929;
    --grey: #a4a5a6;
    --gray: var(--grey);
    --lightGrey: #c4c4c4;
    --lightGray: var(--lightGrey);
    --darkGrey: #585858;
    --darkGray: var(--darkGrey);
    --orange: #ff6900;
    --pink: #ffb3db;
    --purple: #5f52a1;
    --brown: #5d3c2f;
    --slate: #92a2b9;
    --maroon: #660105;
    --aqua: #4ecab8;
    --jade: #00adb9;
    --teal: #306c6d;
    --navy: #0b22a0;
    --graphite: #424242;
    --midnight: #190919;

    --gradient: linear-gradient(
        135deg,
        var(--blue),
        var(--pink),
        var(--yellow)
    );

    --grid-columns: 3;

    --container-width: min(42rem, 96%);

    --margin-unit: 0.5rem;
    --margin-xs: var(--margin-unit);
    --margin-s: calc(2 * var(--margin-unit));
    --margin-m: calc(3 * var(--margin-unit));
    --margin-l: calc(4 * var(--margin-unit));
    --margin-xl: calc(5 * var(--margin-unit));

    --padding-unit: 0.5rem;
    --padding-xs: var(--padding-unit);
    --padding-s: calc(2 * var(--padding-unit));
    --padding-m: calc(3 * var(--padding-unit));
    --padding-l: calc(4 * var(--padding-unit));
    --padding-xl: calc(5 * var(--padding-unit));

    --border-unit: 1px;
    --border-width-s: var(--border-unit);
    --border-width-m: calc(3 * var(--border-unit));
    --border-width-l: calc(6 * var(--border-unit));

    --radius-unit: 4px;
    --radius-s: var(--radius-unit);
    --radius-m: calc(2 * var(--radius-unit));
    --radius-l: calc(3 * var(--radius-unit));
}

/* Dark theme */
/* @media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;
        --bg: var(--black);
        --accent-bg: var(--graphite);
        --text: var(--lightGrey);
        --text-light: var(--grey);
        --primary: var(--pink);
        --primary-hover: var(--maroon);
        --secondary: var(--aqua);
        --accent-text: var(--bg);
        --code: var(--yellow);
        --preformatted: var(--lightGrey);
        --disabled: var(--black);
    }
    /* Add a bit of transparency so light media isn't so glaring in dark mode */
/* img,
    video {
        opacity: 0.8;
    } */
/* } */

/* Reset box-sizing */
*,
*::before,
*::after {
    box-sizing: border-box;
}

/* Reset default appearance */
textarea,
select,
input,
progress {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
}

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

/* Make the body a nice central block */
body {
    color: var(--text);
    font-size: 1.15rem;
    line-height: 1.5;
    margin: 0;
}
main {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr var(--container-width) 1fr;
}

main body > header h1 a {
    text-decoration: none;
}

body > header p {
    max-width: 40rem;
    margin: var(--margin-s) auto;
}

body > footer {
    margin-top: var(--margin-l);
    padding: var(--padding-xs) var(--padding-s) var(--padding-m)
        var(--padding-s);
    color: var(--text-light);
    font-size: 0.9rem;
    text-align: center;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--heading-font);
    text-align: center;
}

/* Format headers */
h1 {
    font-size: 3rem;
    margin-top: var(--margin-l);
    margin-bottom: var(--margin-s);
}

h2 {
    font-size: 2.6rem;
    margin-top: var(--margin-l);
}

h3 {
    font-size: 2rem;
    margin-top: var(--margin-l);
}

h4 {
    font-size: 1.44rem;
    margin-top: var(--margin-m);
}

h5 {
    font-size: 1.15rem;
    margin-top: var(--margin-m);
}

h6 {
    font-size: 0.96rem;
    margin-top: var(--margin-m);
}

p {
    margin: var(--margin-m) 0;
}

/* Prevent long strings from overflowing container */
p,
h1,
h2,
h3,
h4,
h5,
h6 {
    overflow-wrap: break-word;
}

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

/* Reduce header size on mobile */
@media only screen and (max-width: 720px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2.1rem;
    }

    h3 {
        font-size: 1.75rem;
    }

    h4 {
        font-size: 1.25rem;
    }
}

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

a:hover {
    text-decoration: none;
}

button,
  .button,
  a.button, /* extra specificity to override a */
  input[type="submit"],
  input[type="reset"],
  input[type="button"] {
    border: var(--border-width-s) solid var(--primary);
    background-color: var(--primary);
    color: white;
    padding: var(--padding-s);
    text-decoration: none;
    line-height: normal;
    font-weight: bold;
    text-transform: uppercase;
}

.button[aria-disabled="true"],
input:disabled,
textarea:disabled,
select:disabled,
button[disabled] {
    cursor: not-allowed;
    background-color: var(--disabled);
    border-color: var(--disabled);
    color: var(--text-light);
}

button.unbutton {
    border: none;
    background: none;
    display: inline;
    font-weight: normal;
    color: var(--primary);
    text-decoration: underline;
    margin: 0;
    padding: 0;
}

button.unbutton:enabled:hover,
.button.unbutton:not([aria-disabled="true"]):hover {
    border: none;
    background: none;
    display: inline;
    font-weight: normal;
    color: var(--primary);
    text-decoration: none;
}

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

/* Set the cursor to '?' on an abbreviation and style the abbreviation to show that there is more information underneath */
abbr[title] {
    cursor: help;
    text-decoration-line: underline;
    text-decoration-style: dotted;
}

button:enabled:hover,
.button:not([aria-disabled="true"]):hover,
input[type="submit"]:enabled:hover,
input[type="reset"]:enabled:hover,
input[type="button"]:enabled:hover {
    color: var(--accent-text);
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    cursor: pointer;
}

.button:focus-visible,
button:focus-visible:where(:enabled),
input:enabled:focus-visible:where(
        [type="submit"],
        [type="reset"],
        [type="button"]
    ) {
    outline: 2px solid var(--primary);
    outline-offset: 1px;
}

/* Format navigation */
header > nav,
.tabs {
    font-size: 1rem;
    line-height: 2;
    padding: var(--padding-s) 0 0 0;
}

/* Use flexbox to allow items to wrap, as needed */
header > nav ul,
header > nav ol,
.tabs ul,
.tabs ol {
    align-content: space-around;
    align-items: center;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    list-style-type: none;
    margin: 0;
    padding: 0;
}

/* List items are inline elements, make them behave more like blocks */
header > nav ul li,
header > nav ol li,
.tabs ul li,
.tabs ol li {
    display: inline-block;
}

header > nav a,
header > nav a:visited .tabs a,
.tabs a:visited {
    margin: 0 var(--margin-xs) var(--margin-s) var(--margin-xs);
    border: var(--border-width-s) solid var(--border);
    border-radius: var(--radius-m);
    color: var(--text);
    display: inline-block;
    padding: 0.1rem 1rem;
    text-decoration: none;
}

header > nav a:hover,
header > nav a.current,
header > nav a[aria-current="page"],
header > nav a[aria-current="true"],
.tabs a:hover,
.tabs a.current,
.tabs a[aria-current="page"],
.tabs a[aria-current="true"] {
    border-color: var(--primary);
    background-color: var(--primary);
    color: var(--bg);
    cursor: pointer;
}

/* Reduce nav side on mobile */
@media only screen and (max-width: 720px) {
    header > nav a {
        border: none;
        padding: 0;
        text-decoration: underline;
        line-height: 1;
    }

    header > nav a:hover {
        background: none;
        color: var(--primary);
    }
}

/* Consolidate box styling */
aside,
details,
pre,
progress {
    background-color: var(--accent-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-m);
    margin-bottom: var(--margin-s);
}

aside {
    font-size: 1rem;
    width: 30%;
    padding: 0 15px;
    margin-inline-start: 15px;
    float: right;
}
*[dir="rtl"] aside {
    float: left;
}

/* Make aside full-width on mobile */
@media only screen and (max-width: 720px) {
    aside {
        width: 100%;
        float: none;
        margin-inline-start: 0;
    }
}

/* Format forms */
textarea,
select,
input,
button,
.button {
    font-size: inherit;
    font-family: inherit;
    padding: var(--padding-xs);
    margin-bottom: var(--margin-xs);
    border-radius: var(--radius-m);
    box-shadow: none;
    max-width: 100%;
    display: inline-block;
}
textarea,
select,
input {
    color: var(--text);
    background-color: var(--bg);
    border: 1px solid var(--border);
    width: 100%;
    padding: var(--padding-s);
}
label {
    display: block;
}
textarea:not([cols]) {
    width: 100%;
}

/* Add arrow to drop-down */
select:not([multiple]) {
    background-image:
        linear-gradient(45deg, transparent 49%, var(--text) 51%),
        linear-gradient(135deg, var(--text) 51%, transparent 49%);
    background-position: calc(100% - 15px), calc(100% - 10px);
    background-size:
        5px 5px,
        5px 5px;
    background-repeat: no-repeat;
    padding-inline-end: 25px;
}
*[dir="rtl"] select:not([multiple]) {
    background-position: 10px, 15px;
}

/* checkbox and radio button style */
input[type="checkbox"],
input[type="radio"] {
    vertical-align: middle;
    position: relative;
    width: min-content;
}

input[type="checkbox"] + label,
input[type="radio"] + label {
    display: inline-block;
}

input[type="radio"] {
    border-radius: 100%;
}

input[type="radio"]:checked {
    background-color: var(--primary);
}

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: 0.18em;
    height: 0.32em;
    border-radius: 0;
    position: absolute;
    top: 0.05em;
    left: 0.17em;
    background-color: 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: 0.25em;
    height: 0.25em;
    border-radius: 100%;
    position: absolute;
    top: 0.125em;
    background-color: var(--bg);
    left: 0.125em;
    font-size: 32px;
}

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

/* Set a height for color input */
input[type="color"] {
    height: 2.5rem;
    padding: 0.2rem;
}

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

/* Utility classes for typography */
.display-l,
.display-m,
.display-s {
    font-family: var(--font-family);
    line-height: 1.2;
    font-weight: 300;
    font-size: 4rem;
}

.display-m {
    font-size: 3rem;
}

.display-s {
    font-size: 2.25rem;
}

.text-xl {
    font-size: 3.2rem;
}
.text-l {
    font-size: 2rem;
}
.text-m {
    font-size: 1.4rem;
}
.text-s {
    font-size: 1rem;
}
.text-xs {
    font-size: 0.8rem;
}

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.justify {
    text-align: justify;
}

.uppercase {
    text-transform: uppercase;
}

.lowercase {
    text-transform: lowercase;
}

.capitalize,
.capitalise {
    text-transform: capitalize;
}

.italic {
    font-style: italic;
}

.bold {
    font-weight: bold;
}

.underline {
    text-decoration: underline;
}

.no-underline,
.no-underline:hover {
    text-decoration: none !important;
}

.line-through,
.strike-through {
    text-decoration: line-through;
}

.sans-font {
    font-family: var(--sans-font);
}

.serif-font {
    font-family: var(--serif-font);
}

.mono-font {
    font-family: var(--mono-font);
}

.heading-font {
    font-family: var(--heading-font);
}

.fancy-font {
    font-family: var(--fancy-font);
}

.slab-font {
    font-family: var(--slab-font);
}

.brand-font {
    font-family: var(--brand-font);
}

.glow {
    text-shadow: 0 0 0.25em currentcolor;
}

/* Classes for layout */

.full-width {
    grid-column: 1 / -1;
}

.align-vertical {
    display: flex;
    align-items: center;
}

.align-horizontal {
    display: flex;
    justify-content: center;
}

.align-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.align-right {
    display: flex;
    align-items: right;
    justify-content: flex-end;
}

.align-left {
    display: flex;
    align-items: left;
    justify-content: flex-start;
}

.inline {
    display: inline;
}

.block {
    display: block;
}

.inline-block {
    display: inline-block;
}

.absolute {
    position: absolute;
}

.relative {
    position: relative;
}

.fixed {
    position: fixed;
}

.sticky {
    position: sticky;
    top: 0;
    z-index: 1000;
}

.padding {
    padding: var(--padding-m);
}

.padding-x {
    padding: 0 var(--padding-m);
}

.padding-y {
    padding: var(--padding-m) 0;
}

.no-padding {
    padding: 0 !important;
}

.no-padding-x {
    padding-left: 0 !important;
    padding-right: 0 !important;
}

.no-padding-y {
    padding-top: 0 !important;
    padding-bottom: 0 !important;
}

.margin {
    margin: var(--margin-m);
}

.margin-x {
    margin: 0 var(--margin-m);
}

.margin-y {
    margin: var(--margin-m) 0;
}

.margin-auto {
    margin: auto !important;
}

.margin-auto-x {
    margin-left: auto !important;
    margin-right: auto !important;
}

.no-margin {
    margin: 0 !important;
}

.no-margin-x {
    margin-left: 0 !important;
    margin-right: 0 !important;
}

.no-margin-y {
    margin-top: 0 !important;
    margin-bottom: 0 !important;
}

.dropshadow {
    box-shadow: 3px 3px 8px rgba(0, 0, 0, 0.4);
}

.clearfix {
    content: "";
    display: table;
    clear: both;
}

.hidden {
    display: none !important;
}

.muted {
    opacity: 0.7;
}

.no-bullet {
    list-style: none;
    padding-left: 0;
}

/* Classes for gradient text */

.gradient {
    background: var(--gradient);
}

.gradient-text {
    background-image: var(--gradient);
    background-clip: text;
    -webkit-background-clip: text;
    -moz-background-clip: text;
    text-fill-color: transparent;
    -webkit-text-fill-color: transparent;
    -moz-text-fill-color: transparent;
    background-size: 100%;
    -webkit-box-decoration-break: clone;
    display: inline-block;
}

/* Classes for notices */
.notice {
    background: var(--accent-bg);
    border: 2px solid var(--border);
    border-radius: var(--radius-m);
    padding: var(--padding-m);
    margin: var(--margin-m) 0;
}
/* Classes for tags */
.tag,
.tag:visited {
    font-size: 0.8rem;
    margin: 0 0.2rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-s);
    color: var(--text);
    display: inline-block;
    padding: 0.1rem var(--padding-xs);
    text-decoration: none;
}

.tag:hover,
.tag.current,
.tag[aria-current="page"],
.tag[aria-current="true"] {
    border-color: var(--secondary);
    color: var(--secondary);
}

/* Classes for colours */

.primary {
    background-color: var(--primary) !important;
}
.secondary {
    background-color: var(--secondary) !important;
}
.bg {
    background-color: var(--bg) !important;
}

.white {
    background-color: var(--white) !important;
}
.grey,
.gray {
    background-color: var(--grey) !important;
}
.black {
    background-color: var(--black) !important;
}

.red {
    background-color: var(--red) !important;
}
.orange {
    background-color: var(--orange) !important;
}
.yellow {
    background-color: var(--yellow) !important;
}
.green {
    background-color: var(--green) !important;
}
.blue {
    background-color: var(--blue) !important;
}
.purple {
    background-color: var(--purple) !important;
}
.pink {
    background-color: var(--pink) !important;
}
.brown {
    background-color: var(--brown) !important;
}
.slate {
    background-color: var(--slate) !important;
}
.aqua {
    background-color: var(--aqua) !important;
}
.maroon {
    background-color: var(--maroon) !important;
}
.teal {
    background-color: var(--teal) !important;
}
.jade {
    background-color: var(--jade) !important;
}

.primary-text {
    color: var(--primary) !important;
}
.secondary-text {
    color: var(--secondary) !important;
}
.red-text {
    color: var(--red) !important;
}
.orange-text {
    color: var(--orange) !important;
}
.yellow-text {
    color: var(--yellow) !important;
}
.green-text {
    color: var(--green) !important;
}
.blue-text {
    color: var(--blue) !important;
}
.purple-text {
    color: var(--purple) !important;
}
.pink-text {
    color: var(--pink) !important;
}
.brown-text {
    color: var(--brown) !important;
}
.slate-text {
    color: var(--slate) !important;
}
.aqua-text {
    color: var(--aqua) !important;
}
.maroon-text {
    color: var(--maroon) !important;
}
.teal-text {
    color: var(--teal) !important;
}
.jade-text {
    color: var(--jade) !important;
}

/* Classes for grids */

.grid {
    display: grid;
    gap: var(--margin-m);
    grid-template-columns: 1fr;
    grid-template-rows: 1fr auto;
}

@media screen and (min-width: 600px) {
    .grid {
        grid-template-columns: repeat(var(--grid-columns), minmax(0, 1fr));
    }

    .grid.no-gap {
        gap: 0;
    }
    .grid.gap-xs {
        gap: var(--margin-xs);
    }
    .grid.gap-s {
        gap: var(--margin-s);
    }
    .grid.gap-m {
        gap: var(--margin-m);
    }
    .grid.gap-l {
        gap: var(--margin-l);
    }
    .grid.gap-xl {
        gap: var(--margin-xl);
    }

    .one-column.grid {
        --grid-columns: 1;
    }
    .two-column.grid {
        --grid-columns: 2;
    }
    .three-column.grid {
        --grid-columns: 3;
    }
    .four-column.grid {
        --grid-columns: 4;
    }
    .five-column.grid {
        --grid-columns: 5;
    }
    .six-column.grid {
        --grid-columns: 6;
    }

    .grid .row-span-2 {
        grid-row: span 2;
    }
    .grid .row-span-3 {
        grid-row: span 3;
    }
    .grid .row-span-4 {
        grid-row: span 4;
    }
    .grid .row-span-5 {
        grid-row: span 5;
    }
    .grid .row-span-6 {
        grid-row: span 6;
    }

    .grid .col-span-2 {
        grid-column: span 2;
    }
    .grid .col-span-3 {
        grid-column: span 3;
    }
    .grid .col-span-4 {
        grid-column: span 4;
    }
    .grid .col-span-5 {
        grid-column: span 5;
    }
    .grid .col-span-6 {
        grid-column: span 6;
    }

    .grid .start-2 {
        grid-column-start: 2;
    }
    .grid .start-2.col-span-2 {
        grid-column: 2 / span 2;
    }
    .grid .start-2.col-span-3 {
        grid-column: 2 / span 3;
    }
    .grid .start-2.col-span-4 {
        grid-column: 2 / span 4;
    }
    .grid .start-2.col-span-5 {
        grid-column: 2 / span 5;
    }

    .grid .start-3 {
        grid-column-start: 3;
    }
    .grid .start-3.col-span-2 {
        grid-column: 3 / span 2;
    }
    .grid .start-3.col-span-3 {
        grid-column: 3 / span 3;
    }
    .grid .start-3.col-span-4 {
        grid-column: 3 / span 4;
    }

    .grid .start-4 {
        grid-column-start: 4;
    }
    .grid .start-4.col-span-2 {
        grid-column: 4 / span 2;
    }
    .grid .start-4.col-span-3 {
        grid-column: 4 / span 3;
    }

    .grid .start-5 {
        grid-column-start: 5;
    }
    .grid .start-5.col-span-2 {
        grid-column: 5 / span 2;
    }

    .grid .start-6 {
        grid-column-start: 6;
    }
}

/* Print */
@media print {
    @page {
        margin: 1cm;
    }
    body {
        display: block;
    }
    body > header {
        background-color: unset;
    }
    body > header nav,
    body > footer {
        display: none;
    }
    article {
        border: none;
        padding: 0;
    }
    a[href^="http"]::after {
        content: " <" attr(href) ">";
    }
    abbr[title]:after {
        content: " (" attr(title) ")";
    }
    a {
        text-decoration: none;
    }
    p {
        widows: 3;
        orphans: 3;
    }
    hr {
        border-top: 1px solid var(--border);
    }
    mark {
        border: 1px solid var(--border);
    }
    pre,
    table,
    figure,
    img,
    svg {
        break-inside: avoid;
    }
    pre code {
        white-space: pre-wrap;
    }
}