:root {
    --background-colour: #f9f9f9;
    --foreground-colour: #424242;
    --foreground-colour-titles: #000000;
    --half-way-shade: #7f7f7f;
    
    --smallest-size: 2px;
    --smaller-size: 8px;
    --small-size: 12px;
    --font-size: 16px;
    --line-height-size: 24px;
    --large-size: 48px;
    --body-max-width: 702px;
    --narrow-content-margin: var(--line-height-size);
}

* {
    margin: 0;
}

html {
    font-family: ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Consolas, 'DejaVu Sans Mono', monospace;
    font-weight: 400;
    font-size: var(--font-size);
    line-height: var(--line-height-size);
    color: var(--foreground-colour);
}

body {
    background-color: var(--background-colour);
    max-width: var(--body-max-width);
    margin: var(--large-size) auto;
}

h1, h2, h3, p, ol, ul, details {
    margin: var(--small-size) var(--narrow-content-margin);
}

ol, ul {
    padding-inline-start: 36px;
}

li + li {
    margin-top: var(--smaller-size);
}

.list-style-inside {
    list-style-position: inside;
    padding-inline-start: 0;
}

img, blockquote, .container {
    display: block;
    max-width: var(--body-max-width);
    margin: var(--line-height-size) auto;
    border: 1px solid var(--half-way-shade);
    box-sizing: border-box;
}

img {
    background-color: var(--half-way-shade);
}

blockquote > * {
    margin: var(--line-height-size);
}

blockquote > footer > a {
    word-break: break-all;
}

h1, h2, h3 {
    font-size: inherit;
    font-weight: 600;
    margin-top: var(--large-size);
    color: var(--foreground-colour-titles);
}

a, a:visited {
    color: inherit;
}

summary {
    cursor: pointer;
}

strong {
    font-weight: 600;
}

details summary::-webkit-details-marker, details summary::marker {
    display: none;
}


details > ol {
    margin-left: 0;
    margin-right: 0;
}

details > summary::after {
    content: 'More ↓]';
}

details[open] > summary::after {
    content: 'Less ↑]';
}

::selection {
    background-color: var(--foreground-colour);
    color: var(--background-colour);
}

.signature {
    background-image: url('files/signature-black.svg');
    width: 300px;
    height: 62px;
    background-size: cover;
    display: block;
    text-indent: 100%;
    white-space: nowrap;
    overflow: hidden;
}

.back-navigation {
    margin-top: var(--large-size);
}

@media (max-width: 720px) {
    :root {
        --body-max-width: calc(100vw - (var(--smaller-size) * 2));
        --narrow-content-margin: 0px;
    }
    
    .signature {
        width: calc(300px * 0.9);
        height: calc(62px * 0.9);
    }
}

@media (prefers-color-scheme: dark) {
    :root {
        --background-colour: #131414;
        --foreground-colour: #b6c2cc;
        --foreground-colour-titles: #ffffff;
        --half-way-shade: #878787;
    }
    
    html {
        font-weight: 300;
    }
    
    h1, h2, h3 {
        font-weight: 500;
    }
    
    .signature {
        background-image: url('files/signature-white.svg');
    }
}