:root {
    --color-accent: #101cbc;
    --color-accent-contrast: #fff;
    --color-contrast: rgba(0, 0, 0, .85);;
    --color-contrast-hightlight: rgba(0, 0, 0, .95);
    --color-contrast-dim: rgba(0, 0, 0, .55);
    --color-border: rgba(0, 0, 0, .12);
    --color-base: #fff;
    --color-aside: #E9F2FF;
    --color-aside-contrast: rgba(0, 0, 0, .95);
}

*,
*:before,
*:after {
    box-sizing: inherit;
}

html {
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    text-size-adjust: 100%;
    /* scroll-behavior: smooth; */
}

body {
    background-color: var(--color-bar);
    color: var(--color-contrast);
    margin: 0;
    font-family: 'PT Sans', system-ui, sans-serif;
    font-weight: 400;
    font-size: 1.1625rem;
    line-height: 1.6;
    counter-reset: section;
}

[id] {
    scroll-margin-block-start: 1.5rem
}

img {
    max-width: 100%;
    height: auto;
    border: 2px solid var(--color-border);
    padding: 5px;
    display: block;
}

strong {
    font-weight: 700;
}

a:not([class]) {
    text-decoration: none;
    color: var(--color-accent);
    border-bottom: 2px solid var(--color-border);
    padding-block-end: 1px;
    transition: all .2s;
}

a:not([class]):hover {
    border-color: var(--color-accent);
}

h1, h2, h3, h4, h5, h6 {
    position: relative;
	color: var(--color-contrast-hightlight);
    font-weight: 700;
    line-height: 1.25;
    margin: 0;
    margin-block-end: 1rem;
}

h2:focus,
h3:focus { outline: none }

h1 {
    display: inline-block;
    padding-bottom: 10px;
    border-bottom: 5px solid var(--color-border);
}

h2 {
    --content-flow: 3em;
    margin-block-end: 2rem;
    font-size: 2rem;
    counter-reset: subsection;
    counter-increment: section;
}

h2::before {
    content: counter(section) ". ";
}

h2::after {
    content: '';
    position: absolute;
    inset-block-start: 0;
    inset-inline-start: -20px;
    block-size: 100%;
    inline-size: 7px;
    background: var(--color-border);
}

h3 {
	--content-flow: clamp(1.875rem, 5.9016vw + .4365rem, 4.125rem);
    color: var(--color-contrast);
	text-transform: uppercase;
    font-size: 1.25rem;
    counter-increment: subsection;
}

h3::before {
    content: counter(section) "." counter(subsection) ". ";
    display: inline-block;
    margin-right: 10px;
}

h4 {
    --content-flow: 2em;
    font-size: 1em;
    color: var(--color-contrast);
    counter-increment: subsubsection;
    text-transform: uppercase;
}

h4::before {
    content: counter(section) "." counter(subsection) ". " counter(subsubsection) ".";
    display: inline-block;
    margin-right: 10px;
}

h5 {
    font-size: 1em;
}

h1 + h2 { --content-flow: 1em }
h2 + h3 { --content-flow: 0 }

ul li,
ol li { margin: .5em 0 }

pre,
code {
    background-color: #f4f6f8;
    border-radius: 4px;
    font-size: 1rem;
    font-family: monospace;
    color: var(--color-accent);
    padding: .2em .5em;
}

pre {
    padding: .5em 1em;
    max-width: 100%;
    overflow: auto;
}

pre::-webkit-scrollbar {
    -webkit-appearance: none;
    height: 4px;
    width: 4px;
}

pre::-webkit-scrollbar-thumb {
    border-radius: 4px;
    background-color: rgba(0,0,0,.5);
}

aside {
    color: var(--color-aside-contrast);
    padding-block: 1rem;
    padding-inline: 1.5rem;
    background-color: var(--color-aside);
    border-radius: 4px;
    font-size: 1.0625rem;
}

/* Layout */

.sidebar {
    position: fixed;
    inset: 0;
    inset-inline-end: auto;
    inline-size: 250px;
    overflow: auto;
    background: #f4f6f8;
    border-inline-end: 1px solid #eee;
    display: none;

    @media (min-width: 760px) {
        display: block;
    }
}

.content {
    --content-padding: clamp(1.25rem, 4.5902vw + .1311rem, 3rem);
    max-inline-size: 680px;
    padding-block: var(--content-padding);
    margin-inline-end: var(--content-padding);
    margin-inline-start: var(--content-padding);

    @media (min-width: 760px) {
        margin-inline-start: calc(250px + var(--content-padding));
    }
}

.content > * + * {
    margin-block-start: var(--content-flow, 1em);
}

/* Table of Contents */

.toc ol {
    counter-reset: list;
}

.toc ol {
    list-style: none;
}

.toc > .toc-list {
    margin-block-start: .75rem;
    margin-block-end: 1.5rem;
}

.toc-list {
    position: relative;
    padding: 0;
    margin: 0;
}

.toc-list li {
    margin: 0;
    border-block-end: 1px solid #eee;
}

.toc-list ol {
    padding-block: 0.25rem;
    margin-block-end: -1px;
    background-color: #f9fafb;
    border-block: 2px solid #eee;
}

.toc-list ol li:last-child {
    border-bottom: none
}

.toc-link {
    position: relative;
    display: block;
    padding-block: 0.75rem;
    padding-inline-start: 1rem;
    color: currentColor;
    text-decoration: none;
}

.toc-list ol .toc-link {
    padding-block: .5rem;
    padding-inline-start: 2.625rem;
    font-size: 1rem;
}

.toc > ol > li > a::before {
    content: counter(list) ".";
    counter-increment: list;
    font-weight: bold;
    color: var(--color-contrast-dim);
    margin-right: 10px;
}

.toc-link::after {
    content: ' ';
    display: block;
    background-color: transparent;
    position: absolute;
    top: 0; left: 0;
    width: 4px;
    height: 100%;
}

.is-active-link {
    font-weight: 700
}

.is-active-link::after {
    background-color: var(--color-accent)
}