.site-header {
    position: sticky;
    top: 0;
    z-index: 4;
    width: 100%;
    background-color: var(--background-color);
    border-top: 5px solid var(--border-color-03);
    border-bottom: 1px solid var(--border-color-01);
}

.site-header .wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    min-height: var(--header-height);
    position: relative;
}

.site-title {
    margin-right: auto;
    min-width: 0;
    font-size: var(--step-3);
    font-weight: var(--base-font-weight);
    letter-spacing: -0.02em;
    line-height: 1.2;

    &,
    &:visited {
        color: var(--site-title-color);
    }
}

.header-search {
    display: flex;
    align-items: center;
    flex: 0 1 12rem;
    min-width: 0;
    height: 1.75rem;
    margin: 0;
    border: 1px solid var(--border-color-01);
    border-radius: 5px;
    background-color: var(--background-color);
}

.header-search:focus-within {
    outline: 2px solid var(--link-base-color);
    outline-offset: 2px;
}

.header-search button {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 1.75rem;
    height: 100%;
    margin: 0;
    padding: 0;
    border: 0;
    background: transparent;
    color: inherit;
    cursor: pointer;
}

.header-search .icon-span {
    padding-right: 0;
    font-size: 0.8rem;
    line-height: 1;
}

.header-search input {
    flex: 1 1 auto;
    width: 100%;
    min-width: 0;
    height: 100%;
    margin: 0;
    padding: 0 0.4rem 0 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: var(--text-color);
    font: inherit;
    font-size: var(--small-font-size);
    line-height: 1;
    appearance: none;
}

.header-search input:focus {
    outline: none;
}

.header-search input::-webkit-search-decoration,
.header-search input::-webkit-search-cancel-button,
.header-search input::-webkit-search-results-button,
.header-search input::-webkit-search-results-decoration {
    display: none;
}

.nav-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 2.25rem;
    height: 2.25rem;
    padding: 0;
    border: 1px solid var(--border-color-01);
    border-radius: 5px;
    background-color: var(--background-color);
    color: var(--text-color);
    cursor: pointer;
}

.nav-toggle:focus-visible,
.site-settings-toggle:focus-visible {
    outline: 2px solid var(--link-base-color);
    outline-offset: 2px;
}

.nav-toggle-icon {
    position: relative;
    display: block;
    width: 1rem;
    height: 2px;
    background: var(--text-color);
    border-radius: 1px;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
    content: "";
    position: absolute;
    left: 0;
    width: 1rem;
    height: 2px;
    background: var(--text-color);
    border-radius: 1px;
}

.nav-toggle-icon::before {
    top: -6px;
}

.nav-toggle-icon::after {
    top: 6px;
}

.site-header.nav-open .nav-toggle-icon {
    background: transparent;
}

.site-header.nav-open .nav-toggle-icon::before {
    top: 0;
    transform: rotate(45deg);
}

.site-header.nav-open .nav-toggle-icon::after {
    top: 0;
    transform: rotate(-45deg);
}

.site-nav {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.nav-group {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.site-nav a {
    display: inline-flex;
    align-items: center;
    min-height: var(--header-height);
    color: var(--text-color);
}

.site-settings {
    position: relative;
}

.site-settings-toggle {
    display: flex;
    align-items: center;
    min-height: var(--header-height);
    list-style: none;
    cursor: pointer;
    color: var(--text-color);

    &::-webkit-details-marker {
        display: none;
    }

    &::marker {
        content: "";
    }
}

.site-settings-menu {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    z-index: 2;
    box-sizing: border-box;
    width: max-content;
    max-width: min(24rem, calc(100vw - 1.5rem));
    max-height: calc(100dvh - var(--header-height) - 1rem);
    overflow: auto;
    padding: var(--spacing-unit-half);
    background-color: var(--background-color);
    border: 1px solid var(--border-color-01);
    border-radius: 5px;
    line-height: var(--base-line-height);
    text-align: left;
}

.site-settings[open] > .site-settings-menu {
    display: block;
}

.site-settings-section + .site-settings-section {
    margin-top: var(--space-3);
    padding-top: var(--space-3);
    border-top: 1px solid var(--border-color-01);
}

.site-settings-choice {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    color: var(--text-color);
}

.site-settings-choice + .site-settings-choice {
    margin-top: var(--space-3);
}

.site-settings-radios {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--space-1);
}

.site-settings-radios label {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 2rem;
    padding: 0.15em 0.45em;
    border: 1px solid var(--border-color-01);
    border-radius: 4px;
    cursor: pointer;
    white-space: nowrap;
    color: var(--text-color);
}

.site-settings-radios input {
    position: absolute;
    opacity: 0;
    width: 1px;
    height: 1px;
    margin: 0;
}

.site-settings-radios label:has(input:checked) {
    background-color: color-mix(in oklab, var(--link-base-color), var(--background-color) 84%);
    border-color: var(--link-base-color);
}

.site-settings-radios label:has(input:focus-visible) {
    outline: 2px solid var(--link-base-color);
    outline-offset: 2px;
}

.site-settings-choice[data-apparatus-kind="see"] .site-settings-radios label:first-child {
    font-size: var(--small-font-size);
}

.site-settings-choice[data-apparatus-kind="del"] .site-settings-radios label:first-child {
    text-decoration: line-through;
}

.site-settings-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-2);
    cursor: pointer;
    color: var(--text-color);
    font: inherit;
    font-weight: var(--base-font-weight);
    white-space: normal;
}

.site-settings-item + .site-settings-item {
    margin-top: var(--space-2);
}

@media screen and (max-width: 600px) {
    .nav-toggle {
        display: inline-flex;
    }

    .site-nav {
        display: none;
        position: absolute;
        top: 100%;
        right: 0;
        z-index: 2;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        min-width: 12rem;
        padding: var(--space-2) 0;
        background-color: var(--background-color);
        border: 1px solid var(--border-color-01);
        border-radius: 5px;
    }

    .site-header.nav-open .site-nav {
        display: flex;
    }

    .nav-group {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
    }

    .site-nav a {
        min-height: 0;
        padding: var(--space-1) var(--space-3);
        line-height: var(--base-line-height);
    }

    .site-nav .icon-span {
        flex: 0 0 1.25em;
        width: 1.25em;
        padding-right: 0.4em;
        text-align: center;
    }
}

.site-footer {
    border-top: 1px solid var(--border-color-01);
    padding: var(--spacing-unit) 0;
}

.contact-list,
.social-media-list {
    list-style: none;
    margin: 0;
}

.footer-col > :first-child,
.footer-description,
.footer-license,
.footer-feed {
    margin: 0;
    padding: 0;
}

.footer-about {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    column-gap: 0.6rem;
    row-gap: 0.25rem;
    align-items: center;
}

.footer-description {
    grid-column: 1;
    grid-row: 1;
}

.footer-feed {
    grid-column: 2;
    grid-row: 1;
    display: block;
    width: fit-content;
    line-height: inherit;
    text-decoration: none;
}

.footer-license {
    grid-column: 1 / -1;
    grid-row: 2;
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    column-gap: 0.5em;
}

.footer-feed:link,
.footer-feed:visited {
    color: inherit;
}

.footer-feed .icon-span {
    padding-right: 0;
}

.footer-feed .grey {
    color: inherit;
}

.footer-feed:hover {
    color: var(--text-color);
    text-decoration: none;
}

.footer-col-wrapper,
.social-links {
    font-size: 0.9375rem;
    color: var(--brand-color-dimmed);
}

.footer-col-wrapper {
    display: grid;
    gap: var(--space-4);
}

@media screen and (min-width: 600px) {
    .footer-col-wrapper {
        grid-template-columns: 1.1fr 0.8fr 1.4fr;
    }
}

.social-media-list a:hover {
    text-decoration: none;

    .username {
        text-decoration: underline;
    }
}

.page-content {
    padding: var(--spacing-unit) 0;
    flex: 1 0 auto;
}

/* Collection indexes only. Header/footer `.wrapper`s keep `--content-width`. */
html.wide .page-content > .wrapper {
    --content-width: 1800px;
}

.page-header {
    margin-bottom: var(--spacing-unit);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-color-01);
}

.page-title {
    margin-bottom: var(--space-2);
    font-size: var(--step-5);
    font-weight: var(--base-font-weight);
    letter-spacing: -0.02em;
    line-height: 1.15;
}

.page-meta,
.post-list .post-meta {
    font-size: var(--small-font-size);
    color: var(--brand-color-dimmed);
}

.page-meta .bullet-divider {
    padding-inline: var(--space-4);
}

.page-meta .meta-label {
    font-weight: 600;
}

.page-body {
    margin-bottom: var(--spacing-unit);
}

/* Prose pages that already have a TOC. Not collection indexes (`html.wide` is the table width). */
@media screen and (min-width: 1100px) {
    .page-content > .wrapper:has(.toc) {
        max-width: 68rem;
    }

    article.page:has(.toc) {
        display: grid;
        grid-template-columns: 14rem minmax(0, 1fr);
        column-gap: 2.5rem;
        align-items: start;
    }

    article.page:has(.toc) > .page-header {
        grid-column: 2;
    }

    article.page:has(.toc) > .page-body,
    article.page:has(.toc) > .page-body > :has(> .toc) {
        display: contents;
    }

    article.page:has(.toc) > .page-body > :has(> .toc) > .toc {
        grid-column: 1;
        /* `1 / -1` stops at the explicit grid. These rows are implicit, so span past them. */
        grid-row: 1 / span 999;
        position: sticky;
        top: calc(var(--header-height) + 6px + 0.75rem);
        max-height: calc(100dvh - var(--header-height) - 6px - 1.5rem);
        overflow: auto;
        align-self: start;
    }

    article.page:has(.toc) > .page-body > :has(> .toc) > :not(.toc),
    article.page:has(.toc) > .page-body > :not(:has(> .toc)) {
        grid-column: 2;
    }
}

.post-list-heading {
    font-size: var(--step-3);
}

.post-list {
    margin-left: 0;
    list-style: none;

    > li {
        margin-bottom: var(--spacing-unit);
    }
}

.post-link {
    display: block;
    font-size: var(--step-3);
}

.post-excerpt {
    margin-top: var(--space-1);
    margin-bottom: 0;
}

.page-body h3.post-link {
    margin-top: 0;
}

.tree-index ul {
    list-style-type: none;
    margin-bottom: var(--space-4);
    margin-left: 0;
}

.tree-index ul li {
    margin-left: var(--space-4);
}

.year-index ul {
    list-style-type: none;
    margin-left: 0;
    padding-left: 0;
}

.year-index summary {
    cursor: pointer;
}

.year-index > details > summary {
    font-weight: 600;
}

.year-index details details {
    margin-inline-start: var(--space-4);
    margin-top: var(--space-2);
}

.year-index .day-heading {
    margin-bottom: 0;
    margin-top: var(--space-3);
    font-weight: 600;
}

.year-index .date {
    margin-inline-end: var(--space-4);
}

.year-index .description {
    color: var(--brand-color-dimmed);
}

.store-name {
    font-style: italic;
}

.store-name + .store-name::before {
    content: " / ";
    font-style: normal;
}

.store-header l {
    display: block;
}

.store-path-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: space-between;
    column-gap: 1.5em;
    row-gap: 0.25em;
    margin: 0 0 var(--space-2);
}

.store-path {
    margin: 0;
    flex: 1 1 auto;
    min-width: 12em;
    font-size: var(--small-font-size);
    line-height: var(--base-line-height);
    color: var(--text-color);
}

.store-path a,
.store-path a:visited {
    color: var(--text-color);
    text-decoration: none;
}

.store-path a:hover,
.store-path a:focus-visible {
    color: var(--link-base-color);
    text-decoration: underline;
    text-underline-offset: 0.15em;
}

.store-path-sep {
    padding-inline: 0.4em;
    color: var(--brand-color);
}

.store-path-current {
    font-weight: 600;
}

.document-links {
    margin: 0 0 0 auto;
    font-size: var(--small-font-size);
    line-height: var(--base-line-height);
}

.document-links a,
.document-links a:visited,
.page-meta a.source-link,
.page-meta a.source-link:visited {
    color: var(--text-color);
    text-decoration: none;
}

.document-links a:hover,
.document-links a:focus-visible,
.page-meta a.source-link:hover,
.page-meta a.source-link:focus-visible {
    color: var(--link-base-color);
    text-decoration: underline;
    text-underline-offset: 0.15em;
}

button.citation-copy {
    margin: 0;
    padding: 0.1em 0.5em;
    font: inherit;
    font-size: var(--small-font-size);
    color: var(--text-color);
    background: transparent;
    border: 1px solid var(--border-color-01);
    border-radius: 0.25em;
    cursor: pointer;
}

.store-header l.store-current {
    font-size: var(--step-3);
    font-weight: 700;
    line-height: 1.25;
    color: var(--heading-color);
}

table.document-header {
    width: 100%;
    margin-top: var(--space-2);
    padding: var(--space-2);
    background-color: var(--table-header-bg-color);
    border: none;

    td {
        border: none;
        vertical-align: top;
        background: none;
        position: static;
        font-weight: normal;
    }

    .heading {
        width: 18%;
        font-style: italic;
    }
}

.collection-scroll {
    max-width: 100%;
    margin-top: var(--space-2);
}

/* 56rem table plus 2rem wrapper padding on each side. overflow-x: auto is a scrollport,
   so the column titles stick inside the table, one site-header lower than their row. */
@media screen and (max-width: 960px) {
    .collection-scroll {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    table.collection-index th {
        top: 0;
    }
}

/* Beat the 800px `table { display: block; overflow-x: auto }`, which shrinks percentage
   columns and becomes the sticky scrollport. */
table.collection-index {
    display: table;
    overflow: visible;
    width: 100%;
    min-width: 56rem;
    margin-top: 0;

    .description { width: 44%; }
    .date        { width:  8%; }
    .author      { width: 10%; }
    .addressee   { width: 10%; }
    .language    { width:  4%; }
    .document    { width:  5%; }
    .pages       { width:  8%; }

    .date,
    .document,
    .language {
        white-space: nowrap;
    }

    td, th {
        vertical-align: top;
    }

    tr:has(.part-title) td {
        padding-top: var(--space-4);
        border: none;
        border-top: 1px solid var(--border-color-01);
        background: transparent;
    }

    .part-title {
        font-weight: 700;
        font-size: var(--step-1);
        color: var(--heading-color);
    }
}

.store-by {
    margin: var(--space-2) 0;
}

nav.pagination {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: var(--space-2) var(--space-3);
    margin: var(--spacing-unit) 0;
}

nav.pagination a,
nav.pagination .pagination-current {
    padding: 0.15em 0.4em;
}

nav.pagination .pagination-current {
    font-weight: 600;
}