heydon best practice

heydon.css

@font-face {
    font-family: Barlow Condensed;
    src: url(/css/lib/fonts/barlowcondensed-bold.woff2) format("woff2"), url(/css/lib/fonts/barlowcondensed-bold.woff) format("woff");
    font-weight: 700;
    font-style: normal;
}
:root {
    --font-plain: Helvetica Neue, Helvetica, Arial, sans-serif;
    --font-special: Barlow Condensed, Helvetica, sans-serif;
    --font-mono: Menlo, Courier, Courier New, Andale Mono, monospace;
    --color-dark: #050505;
    --color-darkish: #404040;
    --color-lightish: #e6e6e6;
    --color-light: #fafafa;
    --color-mid: grey;
    --ratio: 1.4;
    --s-5: calc(var(--s0) / var(--ratio) / var(--ratio) / var(--ratio) / var(--ratio) / var(--ratio));
    --s-4: calc(var(--s0) / var(--ratio) / var(--ratio) / var(--ratio) / var(--ratio));
    --s-3: calc(var(--s0) / var(--ratio) / var(--ratio) / var(--ratio));
    --s-2: calc(var(--s0) / var(--ratio) / var(--ratio));
    --s-1: calc(var(--s0) / var(--ratio));
    --s0: 1rem;
    --s1: calc(var(--s0) * var(--ratio));
    --s2: calc(var(--s0) * var(--ratio) * var(--ratio));
    --s3: calc(var(--s0) * var(--ratio) * var(--ratio) * var(--ratio));
    --s4: calc(var(--s0) * var(--ratio) * var(--ratio) * var(--ratio) * var(--ratio));
    --s5: calc(var(--s0) * var(--ratio) * var(--ratio) * var(--ratio) * var(--ratio) * var(--ratio));
    --measure: 65ch;
    --line-height: var(--ratio);
    --line-height-small: calc(0.8 * var(--ratio));
    --border-thin: var(--s-5);
    --border-thick: var(--s-2);
    line-height: var(--ratio);
    font-size: calc(0.333vw + 1em);
    font-family: var(--font-plain);
    background-color: var(--color-light);
    color: var(--color-dark);
}
*,
:after,
:before {
    box-sizing: border-box;
    background-color: inherit;
    font-family: inherit;
    color: inherit;
    overflow-wrap: break-word;
    margin: 0;
    padding: 0;
    border: 0 solid;
}
[hidden] {
    display: none;
}
[hidden] + * {
    margin-top: 0 !important;
}
footer,
header,
main,
nav {
    display: block;
}
@media (prefers-reduced-motion: no-preference) {
    :root {
        scroll-behavior: smooth;
    }
}
:focus {
    outline: var(--border-thin) solid var(--color-mid);
    outline-offset: var(--border-thin);
}
[tabindex="-1"]:focus {
    outline: none;
}
.cta,
button {
    font-size: inherit;
    font-weight: 700;
    display: inline-block;
    cursor: pointer;
    font-family: var(--font-special);
    color: var(--color-light);
    background-color: var(--color-dark);
    padding: var(--s-1) var(--s2);
    border-width: var(--border-thin);
}
.cta {
    background-color: transparent;
    color: var(--color-dark);
}
.cta--big {
    display: block;
    font-size: var(--s2);
    text-align: center;
    text-decoration: none;
}
.cta--big span {
    text-decoration: underline;
}
[href="#main"] {
    display: inline-block;
    padding: var(--s-1);
    color: var(--color-light);
    background-color: var(--color-dark);
    position: absolute;
    top: -10rem;
}
[href="#main"]:focus {
    position: absolute;
    z-index: 1;
    top: 0;
    outline: none;
}
.docs-block-link {
    display: block;
}
img {
    width: 100%;
}
[role="figure"],
figure {
    text-align: center;
}
[role="figure"] img,
figure img {
    background-image: linear-gradient(var(--color-light), var(--color-light));
}
.figcaption,
figcaption {
    margin-top: var(--s-1);
    font-size: var(--s-1);
}
.docs-icon {
    width: 0.75em;
    height: 0.75em;
    stroke: currentColor;
    stroke-width: 4;
    fill: none;
    text-decoration-skip: objects;
}
noscript {
    padding: var(--s-1);
    background-color: var(--color-lightish);
}
kbd {
    line-height: 1;
    font-size: var(--s-1);
    color: var(--color-light);
    background-color: var(--color-dark);
    padding: 0.125em 0.5em;
    border-radius: 0.125em;
}
table {
    width: 100%;
    border-collapse: collapse;
}
table code {
    white-space: nowrap;
}
td,
th {
    border-width: var(--border-thin);
    padding: var(--s-1);
    text-align: left;
}
td:first-child {
    font-weight: 700;
}
.docs-props-table {
    overflow-x: auto;
}
.docs-props-table td:last-child {
    font-size: var(--s-1);
}
h1,
h2,
h3,
h4 {
    line-height: var(--line-height-small);
    font-family: var(--font-special);
    font-weight: 700;
    hyphens: auto;
}
.h1,
h1 {
    font-size: var(--s4);
}
.h2,
h2 {
    font-size: var(--s3);
}
.h3,
h3 {
    font-size: var(--s2);
}
.h4,
h4 {
    font-size: var(--s1);
}
aside > ol,
aside > ul,
main > ol,
main > ul {
    padding-left: 2em;
}
main > * + * {
    margin-top: var(--s3);
}
[class^="docs-note"] p + p,
main p + p {
    margin-top: var(--s-1);
}
hr {
    padding: var(--border-thin) 0 0;
    border-left-width: 0;
    border-bottom-width: var(--border-thin);
    border-right-width: 0;
    border-top-width: var(--border-thin);
}
button,
pre {
    outline: var(--border-thin) solid transparent;
    outline-offset: calc(var(--border-thin) * -1);
}
.docs-quote > span {
    font-size: 2.5rem;
    font-family: var(--font-special);
    font-weight: 700;
    background-color: var(--color-dark);
    color: var(--color-light);
    box-decoration-break: clone;
    -webkit-box-decoration-break: clone;
    padding: 0.5rem 1ch;
    line-height: var(--line-height);
}
.docs-logo svg {
    width: 100%;
}
.docs-nav-toggle {
    font-size: var(--s1);
    margin-top: var(--s1);
    font-weight: 700;
    width: 100%;
    text-align: center;
    display: none;
}
.docs-nav-toggle path {
    transition: d 0.25s;
}
.docs-nav-toggle[aria-expanded="true"] path {
    d: path("M3,3 29,29 M16,16 16,16 M3,29 29,3");
}
@media (max-width: 827px) {
    .with-js .docs-nav-toggle {
        display: block;
    }
    .with-js .docs-nav {
        display: none;
    }
    [aria-expanded="true"] + .docs-nav {
        display: block;
    }
}
.docs-nav {
    text-align: center;
    margin-top: var(--s0);
}
.docs-nav ul {
    list-style: none;
}
.docs-nav li + li {
    margin-top: var(--s-2);
}
.docs-nav h2 {
    font-size: var(--s2);
    text-transform: uppercase;
    line-height: var(--line-height);
}
.docs-nav * + h2 {
    margin-top: var(--s2);
}
.docs-nav * + * {
    margin-top: var(--s-3);
}
.docs-index-link {
    display: block;
    font-size: var(--s-1);
}
.docs-index-link .docs-icon {
    width: 1.25em;
    height: 1.25em;
    vertical-align: -0.25em;
}
.docs-nav a {
    display: inline-block;
    line-height: var(--line-height-small);
    font-weight: 700;
    text-decoration: none;
}
.docs-nav a:not([aria-current="true"]):hover {
    text-decoration: underline;
}
.docs-nav [aria-current="true"] {
    position: relative;
    text-indent: -1em;
}
.docs-feed-link {
    font-size: var(--s1);
    font-family: var(--font-special);
    margin-top: var(--s-1);
}
.docs-toc {
    position: relative;
    border-width: var(--s-3);
    font-weight: 700;
}
.docs-toc > [aria-hidden] {
    position: absolute;
    right: 1rem;
    top: -0.75em;
    text-transform: uppercase;
    font-family: var(--font-special);
    padding: 0 0.5rem;
    font-size: var(--s1);
    line-height: var(--line-height-small);
}
.docs-toc ul {
    padding: var(--s1) var(--s3);
    margin: 0;
}
.docs-toc li {
    line-height: var(--line-height-small);
}
.docs-toc li + li {
    margin-top: var(--s-2);
}
.docs-toc a {
    text-decoration: none;
}
.docs-section-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
}
.docs-section-header a {
    font-size: 2.25rem;
}
.docs-section-header > :first-child {
    margin-right: var(--s-2);
}
.docs-page {
    display: flex;
    flex-wrap: wrap;
}
.docs-header,
.docs-main {
    padding: var(--s2);
}
.docs-header {
    flex-basis: 15rem;
    flex-grow: 1;
    position: relative;
    outline: var(--border-thin) dashed;
    padding-top: var(--s3);
}
.docs-main {
    flex-basis: 0;
    flex-grow: 999;
    min-width: 66%;
    display: flex;
    flex-direction: column;
    padding-bottom: 0;
}
.docs-main > :last-child {
    margin-top: 0;
}
footer,
main > * {
    display: block;
    margin-left: auto;
    margin-right: auto;
    max-width: 35rem;
}
main > style,
script {
    display: none;
}
footer:before {
    content: "\220e";
    display: block;
    padding-bottom: var(--s-1);
}
[class^="docs-note"] {
    border-left-width: var(--s0);
    padding-left: var(--s0);
}
[class^="docs-note"] > * + * {
    margin-top: var(--s3);
}
.docs-note--warning {
    border-image: repeating-linear-gradient(-25deg, transparent, transparent 0.333rem, var(--color-dark) 0, var(--color-dark) 0.666rem) 25;
}
.docs-launcher {
    text-align: center;
    margin-top: 0;
}
.docs-launcher:before {
    content: "";
    width: 0;
    display: block;
    margin-left: auto;
    margin-right: auto;
    border-left-width: var(--border-thin);
    height: var(--s2);
}
.docs-demo-page {
    padding: var(--s1);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.docs-demo-page > h1 {
    text-align: center;
    font-size: var(--s3);
}
.docs-demo-page > h1 + * {
    margin-top: var(--s2);
}
.docs-demo-inline {
    max-width: none;
}
label {
    font-weight: 700;
}
label,
label small {
    display: block;
}
label small {
    font-weight: 400;
    font-style: italic;
}
.card-container,
[type="checkbox"] ~ svg,
input,
textarea {
    box-shadow: inset 0.25rem 0.25rem 0 #ddd;
}
.card-container,
[type="email"],
[type="text"],
textarea {
    width: 100%;
    font-size: inherit;
    border-width: var(--border-thin);
    padding: var(--s-1);
}
[type="checkbox"] ~ svg {
    stroke: transparent;
    border-width: var(--border-thin);
    vertical-align: middle;
    padding: 2px;
    box-sizing: content-box;
}
[type="checkbox"]:checked ~ svg {
    stroke: currentColor;
}
[type="checkbox"]:focus ~ svg {
    outline: var(--border-thin) solid var(--color-mid);
}
input:focus,
textarea:focus {
    outline-offset: 0;
}
.docs-field label + * {
    margin-top: var(--s-3);
}
form > * + * {
    margin-top: var(--s1);
}
.docs-generator {
    display: flex;
    flex-wrap: wrap;
    border-width: var(--border-thin);
}
.docs-generator[hidden] {
    display: none;
}
.docs-generator > * {
    flex: 1 0 auto;
    flex-basis: 15rem;
}
.docs-generator form {
    padding: var(--s1);
}
.docs-generator output {
    background-color: var(--color-dark);
    overflow-x: auto;
}
.docs-generator pre {
    overflow: hidden;
}
.docs-hl {
    background-color: var(--color-darkish);
    padding: var(--s-5) var(--s-4);
}
.docs-generator__switcher {
    font-family: var(--font-mono);
    color: var(--color-light);
    display: flex;
    text-align: center;
}
.docs-generator__switcher > * {
    flex-basis: 50%;
}
.docs-generator__switcher label > span {
    padding: var(--s-3);
    display: block;
    background-color: var(--color-light);
    color: var(--color-dark);
}
.docs-generator__switcher input:checked + span {
    filter: invert(100%);
}
.docs-generator__switcher input:focus + span {
    outline: var(--border-thin) solid var(--color-mid);
    outline-offset: calc(var(--border-thin) * -1);
}
@keyframes pinch {
    0% {
        transform: translateY(0.5rem);
    }
    25% {
        transform: translateY(-0.5rem);
    }
    50% {
        transform: translateY(0.25rem);
    }
    75% {
        transform: translateY(-0.25rem);
    }
    87.5% {
        transform: rotate(0.125rem);
    }
    to {
        transform: rotate(0);
    }
}
.docs-output--regenerated code {
    animation: pinch 0.25s ease-in;
}
h1 + .docs-blog-meta {
    font-weight: 700;
    margin-top: var(--s-3);
}
.docs-blog-meta > span {
    white-space: nowrap;
    margin-right: var(--s-3);
}
.docs-features {
    list-style: none;
    padding: 0;
    text-align: center;
}
.docs-features img {
    height: 7.5rem;
    width: auto;
    max-width: 100%;
}
.docs-picture-index [role="listitem"] {
    position: relative;
}
.docs-picture-index a {
    text-decoration: none;
}
.docs-picture-index a h2 {
    text-decoration: underline;
}
.docs-picture-index img {
    max-width: 12rem;
}
.docs-read-now {
    box-shadow: 0 0 0 var(--border-thin) var(--color-light);
    top: 0;
    right: 0;
    transform: rotate(20deg);
    background-color: var(--color-dark);
    color: var(--color-light);
    padding: var(--s-5) var(--s-2);
    line-height: var(--line-height-small);
}
.docs-read-now,
.loader {
    font-weight: 700;
    position: absolute;
}
.loader {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    padding: var(--s5) var(--s0);
    background: hsla(0, 0%, 98%, 0.95);
    z-index: 1;
}
.checkout-form {
    position: relative;
}
code {
    font-family: var(--font-mono);
    font-size: 0.85em;
}
pre code {
    background-color: var(--color-dark);
    display: block;
    padding: var(--s1);
}
pre[class*="language-"],
pre code {
    color: var(--color-light);
    overflow-x: auto;
}
pre[class*="language-"] {
    text-align: left;
    white-space: pre;
    word-spacing: normal;
    word-break: normal;
    word-wrap: normal;
    line-height: 1.4;
    -moz-tab-size: 2;
    -o-tab-size: 2;
    tab-size: 2;
    -webkit-hyphens: none;
    -moz-hyphens: none;
    -ms-hyphens: none;
    hyphens: none;
}
.token.cdata,
.token.comment,
.token.doctype,
.token.prolog {
    color: #cecece;
}
.token.punctuation {
    color: #fefefe;
}
.token.constant,
.token.deleted,
.token.property,
.token.symbol,
.token.tag {
    color: #b1b1b1;
}
.token.attr-name,
.token.builtin,
.token.char,
.token.inserted,
.token.selector,
.token.string {
    color: #cbcbcb;
}
.language-css .token.string,
.style .token.string,
.token.entity,
.token.operator,
.token.url,
.token.variable {
    color: #b8b8b8;
}
.token.atrule,
.token.attr-value,
.token.function {
    color: #d2d2d2;
}
.token.keyword {
    color: #b8b8b8;
}
.token.color,
.token.important,
.token.regex {
    color: #d2d2d2;
}
.token.bold,
.token.important {
    font-weight: 700;
}
.token.italic {
    font-style: italic;
}
.token.entity {
    cursor: help;
}
image-l {
    display: block;
}
image-l:after {
    content: "";
    display: block;
    border: var(--border-thin) solid var(--color-dark);
    background-image: paint(image-cross);
}
text-l {
    display: block;
}
text-l span {
    display: inline-block;
    color: transparent;
    position: relative;
    pointer-events: none;
}
text-l span:before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: calc(50% - var(--border-thin) / 2);
    bottom: calc(50% - var(--border-thin) / 2);
    background-color: var(--color-dark);
}
words-l {
    font-family: var(--font-plain);
}
shrink-grow {
    display: block;
    margin-left: 0;
    margin-right: 0;
    max-width: none;
    overflow: hidden;
    border-width: var(--border-thin);
    padding: var(--s1);
}
shrink-grow .test {
    display: inline-block;
}
switcher-l {
    display: block;
}
switcher-l > * {
    display: flex;
    flex-wrap: wrap;
    overflow: hidden;
}
switcher-l > * > * {
    flex-basis: calc((var(--measure) - 100%) * 999);
    flex-grow: 1;
}
center-l {
    display: block;
    box-sizing: content-box;
    margin-left: auto;
    margin-right: auto;
    max-width: var(--measure);
}
cover-l {
    min-height: 100vh;
    padding: var(--s1);
}
cover-l,
stack-l {
    display: flex;
    flex-direction: column;
}
stack-l {
    justify-content: flex-start;
}
stack-l > * + * {
    margin-top: var(--s1);
}
box-l {
    display: block;
    padding: var(--s1);
    border-width: var(--border-thin);
    outline: var(--border-thin) solid transparent;
    outline-offset: calc(var(--border-thin) * -1);
}
grid-l {
    display: grid;
    grid-gap: var(--s1);
    align-content: start;
    grid-template-columns: 100%;
}
sidebar-l > * {
    display: flex;
    flex-wrap: wrap;
}
sidebar-l > * > * {
    flex-grow: 1;
}
cluster-l > * {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-start;
    align-items: flex-start;
    margin: calc(var(--s1) / 2 * -1);
}
cluster-l > * > * {
    margin: calc(var(--s1) / 2);
}
frame-l {
    display: block;
    position: relative;
    padding-bottom: 66.66667%;
}
frame-l > * {
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
}
frame-l > img,
frame-l > video {
    height: 100%;
    width: 100%;
    object-fit: cover;
}
reel-l {
    display: flex;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-color: var(--color-light) var(--color-dark);
}
reel-l > * {
    flex: 0 0 var(--item-width);
}
reel-l > img {
    height: 100%;
    flex-basis: auto;
    width: auto;
}
reel-l::-webkit-scrollbar {
    height: 1rem;
}
reel-l::-webkit-scrollbar-thumb,
reel-l::-webkit-scrollbar-track {
    background-color: var(--color-dark);
}
reel-l::-webkit-scrollbar-thumb {
    background-image: linear-gradient(var(--color-dark), var(--color-dark) 0.25rem, var(--color-light) 0, var(--color-light) 0.75rem, var(--color-dark) 0);
}
imposter-l {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}
icon-l svg {
    height: 0.75em;
    height: 1cap;
    width: 0.75em;
    width: 1cap;
}
.vh {
    clip-path: inset(100%) !important;
    clip: rect(1px, 1px, 1px, 1px) !important;
    height: 1px !important;
    overflow: hidden !important;
    position: absolute !important;
    white-space: nowrap !important;
    width: 1px !important;
}
.display\:block {
    display: block !important;
}
.filter\:invert {
    filter: invert(100%) !important;
}
.text-align\:center {
    text-align: center !important;
}
.text-align\:left {
    text-align: left !important;
}
.font-size\:body {
    font-size: 1rem !important;
}
.font-size\:small {
    font-size: 0.75rem !important;
}
.font-size\:1 {
    font-size: var(--s1) !important;
}
.max-width\:quarter {
    max-width: calc(var(--measure) / 4) !important;
}
.height\:100\% {
    height: 100%;
}