:root {
    --bg: #f7f8fa;
    --fg: #20262e;
    --muted-fg: #5c6673;
    --color-1: #edf1f7;
    --color-2: #2857a5;
    --color-2-text: #fff;
    --code-bg: #e9edf2;
    --border-color: #c8d0da;
    --badge-bg: #d8e2f0;
    --badge-fg: #20262e;
    --draft-bg: #fff4dc;
    --draft-fg: #76520a;
    --draft-border: #b48731;

    --border: 1px solid var(--border-color);
    --radius: 0.25rem;
    --image-border-radius: 0.5rem;
    --spacing-s: 0.5rem;
    --spacing-m: 1rem;
    --spacing-l: 2rem;
    --list-content-inset: 1.5rem;
    --list-marker-offset: -1.35rem;
    --sticky-header-block-size: calc(
        var(--spacing-m) + var(--spacing-m) + 1.6rem + 1px
    );
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #15191f;
        --fg: #e8edf3;
        --muted-fg: #aeb8c5;
        --color-1: #283341;
        --color-2: #91b9ff;
        --color-2-text: #111827;
        --code-bg: #282f39;
        --border-color: #465363;
        --badge-bg: #3a4b60;
        --badge-fg: #f4f7fb;
        --draft-bg: #453919;
        --draft-fg: #f1d28a;
        --draft-border: #c9a24f;
    }
}

@font-face {
    font-family: "STIX Two Math";
    src: url("../fonts/STIXTwoMath-Regular.woff2") format("woff2");
    font-style: normal;
    font-weight: 400;
    font-display: swap;
}

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

[hidden] {
    display: none !important;
}

body {
    margin: 0;
    background-color: var(--bg);
    color: var(--fg);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.6;
}

main,
header,
footer {
    max-width: 42rem;
    margin: auto;
}

main {
    padding: var(--spacing-m);
}

header {
    background-color: var(--bg);
    padding: var(--spacing-m);
    border-bottom: var(--border);
    position: static;
}

.site-header,
.site-links,
.site-navigation,
.language-navigation {
    display: flex;
    align-items: baseline;
}

.site-header {
    justify-content: space-between;
    gap: var(--spacing-m);
}

.site-name {
    color: var(--fg);
    font-weight: bold;
}

.site-links,
.site-navigation,
.language-navigation {
    gap: var(--spacing-m);
}

.site-navigation {
    align-items: center;
}

@media (min-width: 45rem) {
    header {
        position: sticky;
        top: 0;
        z-index: 1;
    }

    html {
        scroll-padding-block-start: var(--sticky-header-block-size);
    }
}

@media (width < 45rem) {
    .site-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .site-links {
        width: 100%;
        justify-content: space-between;
    }

    .site-navigation {
        flex-wrap: wrap;
    }
}

.language-navigation a {
    display: inline-flex;
    align-items: center;
    line-height: 1;
}

.navigation-icon {
    display: inline-flex;
    align-items: center;
    line-height: 1;
}

.navigation-icon img {
    display: block;
    width: 1.4rem;
    height: 1.4rem;
}

.navigation-icon:hover img,
.navigation-icon:focus-visible img {
    filter: brightness(0) invert(1);
}

@media (prefers-color-scheme: dark) {
    .navigation-icon:hover img,
    .navigation-icon:focus-visible img {
        filter: brightness(0);
    }
}

.language-navigation img {
    display: block;
    box-sizing: border-box;
    width: 1.5rem;
    height: auto;
    border: var(--border);
    border-radius: 0.1rem;
}

.page-navigation,
.page-local-navigation {
    display: flex;
    flex-wrap: wrap;
    justify-content: end;
    gap: var(--spacing-s) var(--spacing-m);
}

.page-navigation {
    margin-top: var(--spacing-s);
}

main > .page-local-navigation {
    margin-block: 0 var(--spacing-m);
}

.page-navigation a,
.page-local-navigation a {
    display: inline-flex;
    gap: 0.3rem;
    align-items: center;
}

.series-navigation {
    margin-top: var(--spacing-m);
    padding: var(--spacing-s) var(--spacing-m);
    background-color: var(--color-1);
    border: var(--border);
    border-radius: var(--radius);
}

.series-navigation-links {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--spacing-m);
    margin-top: var(--spacing-s);
    padding-top: var(--spacing-s);
    position: relative;
    border-top: var(--border);
}

.series-navigation-details p {
    margin: 0;
}

.series-navigation-details p + p {
    margin-top: 0.15rem;
}

.series-navigation-details p:last-child {
    color: var(--muted-fg);
}

.series-navigation-links::before {
    position: absolute;
    inset-block: var(--spacing-s) 0;
    inset-inline-start: 50%;
    border-inline-start: 1px dashed var(--border-color);
    content: "";
}

.series-navigation-links a {
    display: inline-flex;
    gap: 0.3rem;
    align-items: center;
    min-width: 0;
}

.navigation-arrow {
    flex: 0 0 1em;
    width: 1em;
    height: 1em;
}

html[dir="rtl"] .navigation-arrow {
    transform: scaleX(-1);
}

.series-navigation-links a span:last-child {
    min-width: 0;
    overflow-wrap: anywhere;
}

.series-navigation-previous {
    grid-column: 1;
    justify-self: start;
}

.series-navigation-next {
    grid-column: 2;
    justify-self: end;
    text-align: end;
}

.page-meta {
    color: var(--muted-fg);
    font-size: 0.95rem;
}

.page-meta p {
    margin: 0;
}

.post-meta {
    display: flex;
    flex-wrap: wrap;
    column-gap: var(--spacing-m);
    row-gap: 0.15rem;
    margin-block: var(--spacing-m);
    padding: var(--spacing-s) var(--spacing-m);
    border: var(--border);
    border-radius: var(--radius);
    background-color: var(--color-1);
    color: var(--muted-fg);
    font-size: 0.95rem;
}

.post-meta div,
.post-meta dt,
.post-meta dd {
    margin: 0;
}

.post-meta dt,
.post-meta dd {
    display: inline;
}

.post-meta dt::after {
    content: " ";
}

.post-meta-facts,
.post-meta-tags {
    flex-basis: 100%;
}

.post-meta-publication dd,
.post-meta-facts dd {
    display: inline-flex;
    flex-wrap: wrap;
    column-gap: var(--spacing-m);
    row-gap: 0.15rem;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

.series-list {
    display: grid;
    gap: var(--spacing-s);
    list-style-type: decimal;
}

.series-list-summary {
    display: block;
    margin-top: 0.15rem;
    color: var(--muted-fg);
    font-size: 0.9rem;
}

.draft-marker {
    display: inline-block;
    margin-inline-end: 0.35em;
    padding: 0 0.3em;
    border: 1px solid var(--draft-border);
    border-radius: var(--radius);
    background-color: var(--draft-bg);
    color: var(--draft-fg);
    font-size: 0.7em;
    font-weight: 650;
    letter-spacing: 0.05em;
    line-height: 1;
    text-decoration: none;
    vertical-align: middle;
    white-space: nowrap;
}

.page-title,
.page-label {
    display: inline-flex;
    align-items: center;
    gap: 0.35em;
    max-inline-size: 100%;
}

.page-title .draft-marker,
.page-label .draft-marker {
    margin-inline-end: 0;
}

.page-title-text,
.page-label-text {
    min-inline-size: 0;
}

.compact-index,
.series-list,
.page-list {
    margin: var(--spacing-m) 0;
}

.prose :is(ul, ol),
.compact-index,
.series-list {
    padding-inline-start: var(--list-content-inset);
    list-style-position: outside;
}

.attribution-list li + li {
    margin-block-start: var(--spacing-s);
}

.compact-index li::marker {
    color: var(--muted-fg);
}

.pagination {
    display: flex;
    justify-content: end;
    align-items: center;
    gap: 0.3rem;
}

.pagination a,
.pagination [aria-current="page"] {
    display: inline-block;
    min-width: 2rem;
    padding-inline: 0.35rem;
    border-radius: var(--radius);
    text-align: center;
}

.pagination [aria-current="page"] {
    background-color: var(--badge-bg);
    color: var(--badge-fg);
    font-weight: 600;
}

footer {
    padding: var(--spacing-m);
    font-size: 0.9rem;
    color: var(--muted-fg);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem var(--spacing-m);
    margin-bottom: var(--spacing-s);
}

.prose code {
    background-color: var(--code-bg);
    border: var(--border);
    border-radius: var(--radius);
    padding: 0.15em 0.25em;
    -webkit-box-decoration-break: clone;
    box-decoration-break: clone;
    font-size: 0.95rem;
    line-height: 1.2;
}

.prose input[type="checkbox"][disabled] {
    appearance: none;
    inline-size: 1rem;
    block-size: 1rem;
    margin: 0;
    border: var(--border);
    border-radius: var(--radius);
    background-color: var(--color-1);
    opacity: 1;
}

.prose input[type="checkbox"][disabled]:checked {
    border-color: var(--badge-bg);
    background-color: var(--badge-bg);
}

.prose input[type="checkbox"][disabled]:checked::after {
    content: "";
    display: block;
    inline-size: 0.45rem;
    block-size: 0.25rem;
    margin: 0.2rem 0 0 0.2rem;
    border-block-end: 0.15rem solid var(--fg);
    border-inline-start: 0.15rem solid var(--fg);
    transform: rotate(-45deg);
}

.prose img {
    display: block;
    max-inline-size: 100%;
    block-size: auto;
}

@supports selector(li:has(> input[type="checkbox"][disabled])) {
    .prose li:has(> input[type="checkbox"][disabled]) {
        position: relative;
        list-style: none;
    }

    .prose li:has(> input[type="checkbox"][disabled]) > input {
        position: absolute;
        inset-block-start: 0.3em;
        inset-inline-start: var(--list-marker-offset);
    }
}

.prose .heine-table-scroll[role="region"][aria-label][tabindex="0"] {
    max-inline-size: 100%;
    margin-block: var(--spacing-m);
    overflow-x: auto;
}

.prose .heine-table-scroll[role="region"][aria-label][tabindex="0"]:focus-visible {
    outline: 2px solid var(--color-2);
    outline-offset: 2px;
}

.prose table {
    min-inline-size: 100%;
    border-collapse: collapse;
}

.prose th,
.prose td {
    padding: 0.35rem var(--spacing-s);
    border-bottom: var(--border);
    text-align: start;
    vertical-align: top;
}

.prose th {
    background-color: var(--color-1);
}

a {
    color: var(--color-2);
    border-radius: var(--radius);
    text-decoration: none;
    transition: background-color 120ms ease, box-shadow 120ms ease, color 120ms ease;
}

a:hover,
a:focus-visible {
    color: var(--color-2-text);
    background-color: var(--color-2);
    box-shadow: 0 0 0 0.1em var(--color-2);
}

a:focus-visible {
    outline: 2px solid var(--color-2);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    a {
        transition: none;
    }
}

.sections {
    margin-top: var(--spacing-l);
}

.featured-image img {
    display: block;
    max-inline-size: 100%;
    block-size: auto;
    margin: var(--spacing-m) auto;
    border-radius: var(--image-border-radius);
}

.prose picture {
    display: block;
    margin: var(--spacing-m) auto;
}

.prose picture img {
    margin-inline: auto;
    border-radius: var(--image-border-radius);
}

.prose figure {
    margin: var(--spacing-m) auto;
}

.prose figure picture {
    margin: 0 auto;
}

.prose figcaption {
    margin-top: var(--spacing-s);
    color: var(--muted-fg);
    font-size: 0.9rem;
    text-align: center;
}

.guide-article > h1 {
    margin-bottom: var(--spacing-s);
}

.table-of-contents {
    margin-block: var(--spacing-m) var(--spacing-l);
    padding: var(--spacing-s) var(--spacing-m);
    border: var(--border);
    border-radius: var(--radius);
    background-color: var(--color-1);
}

.table-of-contents ul {
    margin: 0;
    padding-inline-start: var(--spacing-m);
}

.table-of-contents li::marker {
    color: var(--muted-fg);
}

.table-of-contents .toc-depth-2,
.table-of-contents .toc-depth-3,
.table-of-contents .toc-depth-4,
.table-of-contents .toc-depth-5,
.table-of-contents .toc-depth-6 {
    list-style-type: circle;
}

.table-of-contents .toc-depth-2 {
    margin-inline-start: var(--spacing-m);
}

.table-of-contents .toc-depth-3,
.table-of-contents .toc-depth-4,
.table-of-contents .toc-depth-5,
.table-of-contents .toc-depth-6 {
    margin-inline-start: var(--spacing-l);
}

.section {
    display: block;
    max-width: 30rem;
    padding-block: var(--spacing-m);
    padding-inline: var(--spacing-l);
    margin-block: var(--spacing-m);
    margin-inline: auto;
    border: var(--border);
    border-radius: var(--radius);
    color: var(--fg);
}

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

.section h2 {
    color: var(--color-2);
    text-align: center;
}

.section:hover,
.section:focus-visible {
    background-color: transparent;
    border-color: var(--color-2);
    box-shadow: none;
    color: var(--fg);
}

.prose blockquote {
    margin-block: var(--spacing-m);
    margin-inline: 0;
    padding: var(--spacing-s) var(--spacing-m);
    border-inline-start: 0.25rem solid var(--border-color);
    border-start-start-radius: 0;
    border-end-start-radius: 0;
    border-start-end-radius: var(--radius);
    border-end-end-radius: var(--radius);
    background-color: var(--color-1);
    color: var(--muted-fg);
    font-style: italic;
}

.prose blockquote > :first-child {
    margin-top: 0;
}

.prose blockquote > :last-child {
    margin-bottom: 0;
}

.prose sup.footnote-reference {
    margin-inline: 0.1em;
    font-size: 0.75rem;
    line-height: 0;
    vertical-align: super;
}

.prose .footnote-reference a,
.prose .heine-footnote-marker label {
    display: inline-flex;
    box-sizing: border-box;
    min-inline-size: 1.45em;
    min-block-size: 1.45em;
    align-items: center;
    justify-content: center;
    padding-inline: 0.2em;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    color: var(--muted-fg);
    font-weight: 600;
    line-height: 1;
}

.prose .footnote-reference a:hover,
.prose .footnote-reference a:focus-visible {
    border-color: var(--color-2);
    background-color: var(--badge-bg);
    color: var(--color-2);
    box-shadow: none;
}

.prose .footnote-definition:nth-child(1 of .footnote-definition) {
    position: relative;
    margin-top: var(--spacing-l);
    padding-top: var(--spacing-m);
}

.prose .footnote-definition:nth-child(1 of .footnote-definition)::before {
    position: absolute;
    inset-block-start: 0;
    inset-inline-start: 0;
    width: 4rem;
    border-top: var(--border);
    content: "";
}

.prose .footnote-definition {
    display: grid;
    grid-template-columns: max-content minmax(0, 1fr);
    column-gap: var(--spacing-s);
    align-items: start;
    margin-top: var(--spacing-s);
    color: var(--muted-fg);
    font-size: 0.9rem;
}

.prose .footnote-definition-label {
    color: var(--color-2);
    font-size: 0.8em;
    line-height: 1.6;
}

.prose .footnote-definition p {
    grid-column: 2;
    margin: 0;
}

.prose .footnote-definition p + p {
    margin-top: var(--spacing-s);
}

.prose .heine-annotated-block {
    position: relative;
}

.prose .heine-footnote-marker {
    margin-inline: 0.1em;
    font-size: 0.75rem;
    line-height: 0;
    vertical-align: super;
}

.prose .heine-footnote-marker label {
    cursor: pointer;
}

.prose .heine-footnote-toggle:checked + .heine-footnote {
    display: block;
}

.prose .heine-footnote {
    display: none;
    margin-top: var(--spacing-s);
    padding: var(--spacing-s) var(--spacing-m);
    border-inline-start: 0.2rem solid var(--border-color);
    border-start-start-radius: 0;
    border-end-start-radius: 0;
    border-start-end-radius: var(--radius);
    border-end-end-radius: var(--radius);
    background-color: var(--color-1);
    color: var(--muted-fg);
    font-size: 0.9rem;
}

.prose .heine-footnote-number {
    display: inline-flex;
    float: inline-start;
    box-sizing: border-box;
    min-inline-size: 1.45em;
    min-block-size: 1.45em;
    align-items: center;
    justify-content: center;
    margin-block-start: 0.1em;
    margin-inline-end: var(--spacing-s);
    padding-inline: 0.2em;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    color: var(--muted-fg);
    font-size: 0.8em;
    font-weight: 600;
    line-height: 1;
}

.prose .heine-footnote > :nth-child(2) {
    margin-top: 0;
}

.prose .heine-footnote > :last-child {
    margin-bottom: 0;
}

@supports selector(.heine-annotated-block:has(.heine-footnote-toggle:focus-visible)) {
    .prose .heine-footnote-toggle {
        position: absolute;
        width: 1px;
        height: 1px;
        overflow: hidden;
        clip-path: inset(50%);
    }

    .prose .heine-annotated-block:has(.heine-footnote-toggle:focus-visible)
        .heine-footnote-marker label {
        outline: 2px solid var(--color-2);
        outline-offset: 2px;
    }

    .prose .heine-footnote-marker label:hover {
        border-color: var(--color-2);
        background-color: var(--badge-bg);
        color: var(--color-2);
    }

    @media (min-width: 84rem) {
        .has-margin-footnotes .prose .heine-annotated-block {
            display: grid;
            grid-template-columns: minmax(0, 1fr) minmax(14rem, 20rem);
            column-gap: var(--spacing-l);
            width: calc(100% + 22rem);
        }

        .has-margin-footnotes .prose .heine-annotated-block > p,
        .has-margin-footnotes .prose .heine-annotated-block > h1,
        .has-margin-footnotes .prose .heine-annotated-block > h2,
        .has-margin-footnotes .prose .heine-annotated-block > h3,
        .has-margin-footnotes .prose .heine-annotated-block > h4,
        .has-margin-footnotes .prose .heine-annotated-block > h5,
        .has-margin-footnotes .prose .heine-annotated-block > h6 {
            grid-column: 1;
        }

        .has-margin-footnotes .prose .heine-footnote-toggle:checked + .heine-footnote {
            grid-column: 2;
            margin-top: 0;
        }
    }
}

@media print {
    .prose .heine-annotated-block {
        display: block !important;
    }

    .prose .heine-footnote-toggle {
        display: none;
    }

    .prose .heine-footnote {
        display: block !important;
    }
}

.prose pre,
.prose code {
    direction: ltr;
    text-align: left;
}

.prose pre {
    padding: var(--spacing-s) var(--spacing-m);
    border-radius: var(--radius);
    overflow-x: auto;
}

.prose pre:not(.giallo) {
    background-color: var(--code-bg);
}

.prose pre > code {
    background-color: transparent;
    border: 0;
    border-radius: 0;
    padding: 0;
}

.prose math {
    font-family: "STIX Two Math";
}

.prose math[display="block"] {
    font-size: 1.25em;
}

.page-list {
    padding: 0;
    list-style: none;
}

.page-list-item {
    margin-block: var(--spacing-s);
    padding: 0.7rem var(--spacing-m);
    border: var(--border);
    border-radius: var(--radius);
    line-height: 1.35;
}

.page-list-item:hover,
.page-list-item:focus-within {
    background-color: transparent;
    border-color: var(--color-2);
    box-shadow: none;
}

.page-list-heading,
.page-list-title,
.page-list-summary {
    display: block;
}

.page-list-heading,
.series-list-heading {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
}

.page-list-heading .draft-marker,
.series-list-heading .draft-marker {
    flex: none;
}

.page-list-heading > a {
    color: var(--fg);
}

.page-list-item:hover .page-list-heading > a,
.page-list-item:focus-within .page-list-heading > a {
    color: var(--color-2);
}

.page-list-heading > a:hover,
.page-list-heading > a:focus-visible {
    background-color: transparent;
    box-shadow: none;
}

.page-list-title {
    font-weight: 600;
}

.page-list-summary {
    margin-top: 0.15rem;
    color: var(--muted-fg);
    font-size: 0.9rem;
}

.item-count {
    display: inline-block;
    min-width: 1.5em;
    padding-inline: 0.35em;
    border-radius: var(--radius);
    background-color: var(--badge-bg);
    color: var(--badge-fg);
    font-size: 0.85em;
    line-height: 1.4;
    text-align: center;
}

.search-form-controls {
    display: flex;
    gap: var(--spacing-s);
    margin-block: var(--spacing-s) var(--spacing-m);
}

.search-form input {
    min-width: 0;
    flex: 1;
    padding: var(--spacing-s);
    border: var(--border);
    border-radius: var(--radius);
    color: var(--fg);
    background: var(--bg);
    font: inherit;
}

.search-form button {
    padding: var(--spacing-s) var(--spacing-m);
    border: var(--border);
    border-radius: var(--radius);
    color: var(--fg);
    background: var(--color-1);
    font: inherit;
}

.search-form button:hover,
.search-form button:focus-visible {
    color: var(--color-2-text);
    background: var(--color-2);
}

.search-form input:focus-visible,
.search-form button:focus-visible {
    outline: 2px solid var(--color-2);
    outline-offset: 2px;
}

.search-status:empty {
    display: none;
}