:root {
    --color-bg: #fff;
    --color-fg: #333;
    --color-bg-tint: #f5f5f5;
    --color-border: #888;
    --color-link: #26c;
    --color-link-focus: #248;
    --color-shadow: #0005;

    --padding: 0.5em;
    --spacer: 1em;
    --indentation: 1.5rem;

    overflow-y: scroll;
    background-color: var(--color-bg);
    color: var(--color-fg);
    font-family: sans-serif;
    line-height: 1.5;
    accent-color: var(--color-link);
}

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

[hidden] {
    display: none !important;
}

img,
video {
    max-inline-size: 100%;
    block-size: auto;
}

p, address, blockquote, pre, table, dl, ul, ol, hr, figure, fieldset {
    margin-block: 0 var(--spacer);
}

h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    margin-block: 0 0.8rem;
    break-after: avoid;
}
* + h1, * + h2, * + h3, * + h4, * + h5, * + h6 {
    margin-block-start: calc(1.5 * var(--spacer));
}

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

hr {
    border: 0;
    border-block-end: 1px solid var(--color-border);
}

pre, code {
    font-size: 90%;
    font-family: monospace;
    background-color: var(--color-bg-tint);
}
code {
    padding-inline: 0.25em;
}
pre {
    padding: var(--padding);
    overflow: auto;
    border: 1px solid var(--color-border);
}
pre code {
    all: revert;
}

ol, ul {
    padding-inline-start: var(--indentation);
}
dt {
    font-weight: bold;
}
dd {
    margin-inline-start: var(--indentation);
}

blockquote {
    font-style: italic;
    margin-inline: var(--indentation) 0;
}

table {
    border-collapse: collapse;
    border-spacing: 0;
}
tr {
    border-bottom: 1px solid var(--color-border);
}
td, th {
    text-align: start;
    padding: calc(var(--padding) * 0.5);
    vertical-align: top;
}

textarea,
select[multiple] {
    resize: vertical;
}

/* Prevent sub and sup affecting line-height. */
sub, sup {
    line-height: 0;
}

dialog {
    box-shadow: 0 0 0.5em var(--color-shadow);
    border: 1px solid var(--color-border);
    padding: var(--padding);
}

@media print {
    :root {
        --color-fg: #000;
        --color-bg: #fff;
    }
}