/*
 * An open field guide: a contents leaf, a quiet reading leaf, and blue ink.
 * mdBook still owns content, search, chapter links, and public URLs.
 */
:root {
    --book-width: 1240px;
    --book-margin: clamp(20px, 4.8vw, 88px);
    --sidebar-target-width: 340px;
    --sidebar-width: min(var(--sidebar-target-width), 84vw);
    --sidebar-resize-indicator-width: 0px;
    --content-max-width: 72rem;
    --menu-bar-height: 66px;
    --page-padding: clamp(30px, 5vw, 78px);
    --searchbar-margin-block-start: 24px;
    --mono-font: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace;
    --code-font-size: 0.78em;
    --book-serif: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
    --book-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --desk: #e9e6df;
    --paper: #fbf9f2;
    --paper-left: #f5f2e9;
    --ink: #292b29;
    --muted: #76766c;
    --rule: #d8d5c9;
    --blue: #245bba;
    --blue-hover: #17428e;
    --wash: #eeece3;
    --mark: #ece2b8;
    --fold: rgb(69 58 33 / 9%);
    --book-shadow: rgb(54 47 31 / 12%);
    --book-color-scheme: light;
    --book-scrollbar: #b7b4a7;
}

.light, .rust, .coal, .navy, .ayu, html:not(.js) {
    --bg: var(--paper);
    --fg: var(--ink);
    --sidebar-bg: var(--paper-left);
    --sidebar-fg: var(--ink);
    --sidebar-non-existant: var(--muted);
    --sidebar-active: var(--blue);
    --sidebar-spacer: var(--rule);
    --scrollbar: var(--book-scrollbar);
    --icons: var(--muted);
    --icons-hover: var(--blue);
    --links: var(--blue);
    --inline-code-color: var(--ink);
    --theme-popup-bg: var(--paper);
    --theme-popup-border: var(--rule);
    --theme-hover: var(--wash);
    --quote-bg: var(--paper-left);
    --quote-border: var(--rule);
    --warning-border: #b58b3c;
    --table-border-color: var(--rule);
    --table-header-bg: var(--wash);
    --table-alternate-bg: transparent;
    --searchbar-border-color: var(--rule);
    --searchbar-bg: var(--paper);
    --searchbar-fg: var(--ink);
    --searchbar-shadow-color: transparent;
    --searchresults-header-fg: var(--muted);
    --searchresults-border-color: var(--rule);
    --searchresults-li-bg: var(--wash);
    --search-mark-bg: var(--mark);
    --overlay-bg: rgb(20 20 18 / 45%);
    --sidebar-header-border-color: var(--rule);
    --color-scheme: var(--book-color-scheme);
}

html {
    color: var(--ink);
    background: var(--desk);
    font-family: var(--book-serif);
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    background: var(--desk);
    color: var(--ink);
    font-size: 1.8rem;
    line-height: 1.7;
}

::selection { color: var(--ink); background: var(--mark); }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 4px; }

/* The quiet publisher's line above the book. */
.site-masthead {
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    max-width: var(--book-width);
    height: 100px;
    margin-inline: auto;
    width: calc(100% - var(--book-margin) * 2);
}
.brand, .brand img { display: block; }
.brand .brand-logo-dark { display: none; }
.brand { flex-shrink: 0; }
.masthead-caption { color: var(--muted); font-size: 1.4rem; }
.site-link, .site-link:visited {
    color: var(--ink);
    font: 1.2rem var(--book-ui);
    text-decoration: none;
}
.site-link span { margin-left: 10px; color: var(--blue); }
.site-link:hover { color: var(--blue); }
.skip-to-content {
    position: fixed;
    z-index: 1000;
    top: 12px;
    left: 20px;
    padding: 8px 16px;
    background: var(--paper);
    color: var(--blue);
    transform: translateY(-160%);
}
.skip-to-content:focus { transform: none; }

/* The two leaves share a cover, with a soft shadow at the binding. */
#mdbook-body-container {
    position: relative;
    display: grid;
    grid-template-columns: 0 minmax(0, 1fr);
    grid-template-areas: "contents reading";
    width: calc(100% - var(--book-margin) * 2);
    max-width: var(--book-width);
    min-height: calc(100vh - 150px);
    margin: 0 auto 50px;
    border: 1px solid var(--rule);
    border-radius: 3px 7px 7px 3px;
    background: var(--paper-left);
    box-shadow: 0 2px 0 var(--paper), 0 3px 0 var(--rule),
        0 5px 0 var(--paper), 0 6px 0 var(--rule),
        0 16px 38px -12px var(--book-shadow);
}
#mdbook-body-container:has(#mdbook-sidebar-toggle-anchor:checked) {
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
}
.sidebar {
    grid-area: contents;
    position: sticky;
    align-self: start;
    inset: 20px auto auto 0;
    height: calc(100vh - var(--contents-top, 20px));
    height: calc(100dvh - var(--contents-top, 20px));
    border: 0;
    background: transparent;
    font-size: 1.5rem;
}
.book-title-page { padding: 38px 34px 0; }
.contents-heading, .chapter-kicker, .nav-direction {
    font-family: var(--mono-font);
    font-weight: 400;
    font-size: 1.05rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}
.book-title, .book-title:visited {
    display: inline-block;
    color: var(--blue);
    font-size: 3.7rem;
    font-weight: 400;
    line-height: 1.12;
    letter-spacing: -0.045em;
    text-decoration: none;
}
.contents-heading {
    display: flex;
    justify-content: space-between;
    margin-top: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--rule);
    color: var(--muted);
}
.contents-heading > :last-child { color: var(--blue); font: italic 1.8rem var(--book-serif); }
.sidebar .sidebar-scrollbox {
    inset: 156px 0 0;
    padding: 6px 26px 6px 30px;
    scrollbar-width: thin;
    scrollbar-color: var(--rule) transparent;
}
.sidebar .sidebar-scrollbox::-webkit-scrollbar { width: 4px; }
.sidebar .sidebar-scrollbox::-webkit-scrollbar-thumb { background: var(--rule); }
.sidebar-iframe-outer { top: 156px; bottom: 0; width: 100%; height: calc(100% - 156px); }
.noscript-contents { color: var(--muted); cursor: pointer; font: 1.1rem var(--book-ui); }
.sidebar .sidebar-resize-handle { display: none; }
.contents-close { display: none; }
.chapter { margin: 0; line-height: 1.4; }
.chapter li.chapter-item { margin-top: 2px; }
.chapter-link-wrapper { align-items: baseline; }
.chapter li a {
    position: relative;
    display: block;
    flex: 1;
    padding: 7px 4px;
    color: var(--ink);
    font-size: 1.55rem;
    line-height: 1.4;
    text-decoration: none;
}
.chapter li a strong {
    display: inline-block;
    min-width: 28px;
    color: var(--muted);
    font: 1.05rem var(--mono-font);
    font-weight: 400;
}
.chapter li a:hover { color: var(--blue); }
.chapter li a.active { color: var(--blue); font-weight: 600; }
.chapter li a.active::before {
    position: absolute;
    left: -13px;
    top: 14px;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--blue);
    content: "";
}
.chapter li a.active strong { color: var(--blue); }
.chapter li ol { margin: 0 0 9px 20px; padding-left: 12px; border-left: 1px solid var(--rule); }
.chapter li ol a { padding-block: 5px; font-size: 1.3rem; color: var(--muted); }
.chapter li ol a strong { min-width: 29px; font-size: 0.95rem; }
.chapter li ol li ol { margin-left: 4px; }
.chapter-fold-toggle { flex: 0 0 24px !important; padding: 7px 0 !important; text-align: center; opacity: 1; }
.chapter-fold-toggle div { font-size: 0; transition: none; }
.chapter-fold-toggle div::after { content: "+"; font: 1.3rem var(--mono-font); color: var(--muted); }
.chapter li.expanded > span > .chapter-fold-toggle div { transform: none; }
.chapter li.expanded > span > .chapter-fold-toggle div::after { content: "−"; }
.on-this-page { margin-left: 32px; padding-left: 8px; border-left: 1px solid var(--rule); }
.chapter .spacer { height: 1px; margin-block: 14px; background: var(--rule); }

.page-wrapper {
    grid-area: reading;
    position: relative;
    min-width: 0;
    min-height: calc(100vh - 150px);
    border-radius: 0 6px 6px 0;
    background: var(--paper);
    box-shadow: inset 16px 0 22px -22px rgb(56 48 30 / 30%);
}
#mdbook-sidebar-toggle-anchor:checked ~ .page-wrapper { transform: none; margin-inline-start: 0; }
.js:not(.sidebar-resizing) .page-wrapper { transition: none; }
.page { margin: 0; padding-inline: var(--page-padding); }
#mdbook-menu-bar-hover-placeholder { display: none; }
#mdbook-menu-bar,
#mdbook-menu-bar.sticky,
#mdbook-menu-bar:hover,
html.sidebar-visible #mdbook-menu-bar {
    position: sticky;
    top: 0 !important;
    height: var(--menu-bar-height);
    box-sizing: border-box;
    flex-wrap: nowrap;
    gap: 12px;
    margin: 0;
    align-items: center;
    border-bottom: 1px solid var(--rule);
    background: var(--paper);
    box-shadow: none;
}
.left-buttons { position: relative; gap: 18px; margin: 0; }
.right-buttons { display: flex; align-items: center; gap: 18px; margin: 0; }
.right-buttons a { display: inline-flex; align-items: center; min-height: 44px; }
#mdbook-menu-bar .icon-button, .right-buttons a {
    padding: 0;
    color: var(--muted);
    font: 1.1rem var(--book-ui);
    text-decoration: none;
    white-space: nowrap;
}
#mdbook-menu-bar .icon-button { line-height: var(--menu-bar-height); }
#mdbook-menu-bar .icon-button:hover, .right-buttons a:hover { color: var(--blue); text-decoration: none; }
#mdbook-menu-bar .fa-svg { display: none; }
#mdbook-menu-bar #mdbook-theme-toggle { min-width: 20px; }
#mdbook-menu-bar #mdbook-theme-toggle .fa-svg {
    display: inline-block;
    padding: 0;
    font-size: 1.6rem;
    line-height: 1;
    vertical-align: middle;
}
#mdbook-theme-list {
    top: 100%;
    left: 48px;
    min-width: 140px;
    padding: 6px;
    border: 1px solid var(--rule);
    border-radius: 3px;
    color: var(--ink);
    background: var(--paper);
    box-shadow: 0 8px 24px var(--book-shadow);
    font: 1.3rem var(--book-ui);
}
#mdbook-theme-list .theme { min-height: 40px; padding: 6px 22px; }
#mdbook-sidebar-toggle::after { content: "Contents"; }
#mdbook-search-toggle::after { content: "Search /"; }
.right-buttons a[title="Print this book"]::after { content: "Print"; }
.right-buttons a[title="Git repository"]::after { content: "GitHub ↗"; }
.menu-title {
    min-width: 0;
    color: var(--muted);
    font: 1.25rem var(--book-serif);
    letter-spacing: 0;
}

/* Chapter typography: a generous opening and a comfortable measure. */
.content { padding: 42px 0 0; overflow: visible; }
.content:focus { outline: none; }
.chapter-kicker {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--content-max-width);
    margin: 0 auto 19px;
    color: var(--blue);
}
.chapter-ornament { font: 2.5rem var(--book-serif); }
.content main { max-width: var(--content-max-width); margin-inline: auto; }
.content main > :first-child { margin-top: 0; }
.content h1, .content h2, .content h3, .content h4, .content h5, .content h6 {
    color: var(--ink);
    font-family: var(--book-serif);
    font-weight: 400;
    text-wrap: balance;
}
.content h1 { margin: 0 0 30px; font-size: clamp(3.8rem, 4.3vw, 6rem); line-height: 1.08; letter-spacing: -0.055em; }
.content h2 { margin: 44px 0 16px; font-size: 3rem; line-height: 1.2; letter-spacing: -0.025em; }
.content h3 { margin: 32px 0 12px; font-size: 2.3rem; line-height: 1.3; }
.content h4, .content h5, .content h6 { margin: 28px 0 12px; font-size: 1.9rem; font-weight: 600; }
.content .header:link, .content .header:visited { color: var(--ink); text-decoration: none; }
.content .header:hover { color: var(--blue); }
.content p, .content ol, .content ul { line-height: 1.75; }
.content p, .content ol, .content ul, .content dl { margin: 0 0 20px; }
.content ul, .content ol { padding-left: 24px; }
.content li { padding-left: 4px; margin: 8px 0; }
.content li::marker { color: var(--ink); font-size: 0.85em; }
.content strong { font-weight: 700; }
.content a:link:not(.header), .content a:visited:not(.header) {
    color: var(--blue);
    text-decoration: underline;
    text-decoration-color: color-mix(in srgb, var(--blue), transparent 60%);
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}
.content a:hover:not(.header) { color: var(--blue-hover); text-decoration-color: currentColor; }
#introduction + p::first-letter {
    float: left;
    margin: 4px 7px 0 0;
    color: var(--blue);
    font-size: 6.2rem;
    font-weight: 400;
    line-height: 0.85;
}
.content hr { margin: 32px 0 24px; border: 0; border-top: 1px solid var(--rule); }
.content img, .content video { height: auto; border: 1px solid var(--rule); border-radius: 2px; }

/* Technical material stays crisp on the paper. */
:not(pre) > code, :not(pre) > .hljs {
    padding: 2px 4px;
    border-radius: 2px;
    color: var(--ink);
    background: var(--wash);
}
pre { margin: 24px 0; border: 1px solid var(--rule); border-radius: 3px; background: var(--wash); }
pre > code { padding: 18px 20px; line-height: 1.65; overflow-x: auto; }
pre > .hljs { background: var(--wash); }
pre > .buttons { top: 4px; right: 4px; }
pre:focus-within > .buttons { visibility: visible; opacity: 1; }
pre > .buttons button { color: var(--blue); border: 1px solid var(--rule); border-radius: 2px; background: var(--paper); }
.table-wrapper { margin: 24px 0; }
table { width: 100%; margin: 0; font: 1.35rem/1.6 var(--book-ui); }
table th, table td, table thead th, table thead td { padding: 11px 13px; border: 1px solid var(--rule); text-align: left; }
table th, table thead td { background: var(--wash); font-weight: 600; }
table tbody tr:nth-child(2n) { background: transparent; }
blockquote { margin: 26px 0; padding: 18px 24px; border: 0; border-left: 2px solid var(--blue); background: var(--paper-left); }
blockquote > :first-child { margin-top: 0; }
blockquote > :last-child { margin-bottom: 0; }
.warning { margin: 24px 0; padding: 18px 24px; border-left: 2px solid var(--warning-border); background: var(--wash); }
.warning::before { display: none; }
mark { color: var(--ink); background: var(--mark); }
kbd { padding: 2px 5px; border: 1px solid var(--rule); border-radius: 2px; background: var(--paper-left); font: 0.78em var(--mono-font); }
details { margin: 24px 0; padding: 16px 20px; border: 1px solid var(--rule); }
summary { cursor: pointer; font-weight: 600; }

/* Search and the lower page furniture. */
#mdbook-search-wrapper { margin-inline: auto; max-width: var(--content-max-width); font-family: var(--book-ui); }
#mdbook-searchbar { box-sizing: border-box; border-radius: 2px; font: 1.5rem var(--book-ui); }
#mdbook-searchbar:focus { outline: 2px solid var(--blue); outline-offset: 2px; box-shadow: none; }
#mdbook-searchresults { padding-left: 0; }
#mdbook-searchresults li { padding: 12px 0; margin: 0; border-bottom: 1px solid var(--rule); }
#mdbook-searchresults .teaser { margin-left: 0; }
.nav-wide-wrapper { display: none; }
.nav-wrapper {
    display: flex !important;
    justify-content: space-between;
    gap: 24px;
    max-width: var(--content-max-width);
    margin: 48px auto 0;
    padding: 24px 0;
    border-top: 1px solid var(--rule);
}
.content .nav-wrapper .mobile-nav-chapters,
.content .nav-wrapper .mobile-nav-chapters:link,
.content .nav-wrapper .mobile-nav-chapters:visited {
    display: flex;
    flex-direction: column;
    gap: 7px;
    width: auto;
    max-width: 47%;
    float: none;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: none;
    text-decoration: none;
    line-height: 1.4;
}
.mobile-nav-chapters.next { margin-left: auto; text-align: right; }
.nav-direction { color: var(--muted); font-size: 0.95rem; }
.nav-chapter-title { font-size: 1.65rem; }
.mobile-nav-chapters:hover .nav-chapter-title { text-decoration: underline; text-underline-offset: 3px; }
#mdbook-help-popup { border: 1px solid var(--rule); border-radius: 3px; color: var(--ink); background: var(--paper); font-family: var(--book-ui); }

@media screen and (min-width: 1080px) {
    /* The binding belongs to the full book, not the sticky contents panel. */
    #mdbook-body-container:has(#mdbook-sidebar-toggle-anchor:checked)::before {
        position: absolute;
        top: 0;
        bottom: 0;
        left: calc(var(--sidebar-width) - 20px);
        width: 20px;
        background: linear-gradient(90deg, transparent, var(--fold));
        content: "";
        pointer-events: none;
    }
    /* A ribbon tucked into the top of the contents leaf. */
    .book-title-page::after {
        position: absolute;
        top: 0;
        right: 28px;
        width: 19px;
        height: 42px;
        background: var(--blue);
        clip-path: polygon(0 0, 100% 0, 100% 100%, 50% 80%, 0 100%);
        content: "";
    }
}

@media (max-width: 1079px) {
    :root { --page-padding: clamp(24px, 6vw, 64px); }
    #mdbook-body-container:has(#mdbook-sidebar-toggle-anchor:checked) { grid-template-columns: 0 minmax(0, 1fr); }
    .sidebar {
        position: fixed;
        z-index: 200;
        top: 18px;
        bottom: 18px;
        left: var(--book-margin);
        height: calc(100dvh - 36px);
        max-height: none;
        border: 1px solid var(--rule);
        border-radius: 3px;
        background: var(--paper-left);
        box-shadow: 0 12px 60px rgb(0 0 0 / 25%);
    }
    .sidebar::after {
        position: absolute;
        inset: 0 0 0 auto;
        width: 20px;
        background: linear-gradient(90deg, transparent, var(--fold));
        content: "";
        pointer-events: none;
    }
    #mdbook-sidebar-toggle-anchor:not(:checked) ~ .sidebar { transform: translateX(calc(-100% - var(--book-margin) - 20px)); }
    .contents-close {
        display: block;
        position: absolute;
        top: 12px;
        right: 16px;
        width: 44px;
        height: 44px;
        border: 0;
        background: transparent;
        color: var(--muted);
        font: 2.4rem var(--book-ui);
        cursor: pointer;
    }
    .page-wrapper { box-shadow: none; }
    .masthead-caption { font-size: 1.25rem; }
}

@media (max-width: 620px) {
    :root { --book-margin: 16px; --page-padding: 24px; --menu-bar-height: 58px; }
    body { font-size: 1.7rem; }
    .site-masthead { height: 78px; gap: 16px; }
    .brand img { width: 119px; height: 28px; }
    .masthead-caption, .menu-title { display: none; }
    .site-link { font-size: 1.1rem; }
    #mdbook-body-container { margin-bottom: 28px; }
    #mdbook-menu-bar { justify-content: space-between; gap: 10px; }
    .left-buttons, .right-buttons { gap: 10px; }
    #mdbook-menu-bar .icon-button, .right-buttons a { font-size: 1.05rem; }
    .content { padding-top: 30px; }
    .chapter-kicker { margin-bottom: 15px; font-size: 0.95rem; }
    .content h1 { font-size: clamp(3.2rem, 9vw, 4.1rem); margin-bottom: 25px; }
    .content h2 { font-size: 2.7rem; }
    .content p, .content ol, .content ul { line-height: 1.7; }
    pre > code { padding: 14px; }
    .nav-wrapper { gap: 16px; }
    .nav-chapter-title { font-size: 1.45rem; }
}

@media (max-height: 600px) {
    .book-title-page { padding: 20px 30px 0; }
    .book-title-page::after { display: none; }
    .book-title { font-size: 2.6rem; }
    .contents-heading { margin-top: 16px; }
    .sidebar .sidebar-scrollbox { top: 110px; }
    .sidebar-iframe-outer { top: 110px; height: calc(100% - 110px); }
}

/* mdBook applies the selected theme class and follows system changes in Auto. */
html:is(.navy, .coal, .ayu) {
    --desk: #1c1e20;
    --paper: #272927;
    --paper-left: #232523;
    --ink: #e1dfd4;
    --muted: #a5a69a;
    --rule: #43463e;
    --blue: #8fb5f5;
    --blue-hover: #b7d0ff;
    --wash: #30332f;
    --mark: #585036;
    --fold: rgb(0 0 0 / 18%);
    --book-shadow: rgb(0 0 0 / 40%);
    --book-color-scheme: dark;
    --book-scrollbar: #55594e;
}
html:is(.navy, .coal, .ayu) .brand-logo-light { display: none; }
html:is(.navy, .coal, .ayu) .brand-logo-dark { display: block; }
html:is(.navy, .coal, .ayu) .hljs { color: #dddccf; background: var(--wash); }
html:is(.navy, .coal, .ayu) :is(.hljs-comment, .hljs-quote) { color: #a5a69a; }
html:is(.navy, .coal, .ayu) :is(.hljs-keyword, .hljs-selector-tag) { color: #c4afe4; }
html:is(.navy, .coal, .ayu) :is(.hljs-string, .hljs-symbol, .hljs-bullet) { color: #b5c695; }
html:is(.navy, .coal, .ayu) :is(.hljs-title, .hljs-section, .hljs-attribute, .hljs-attr) { color: #91bde0; }
html:is(.navy, .coal, .ayu) :is(.hljs-number, .hljs-literal, .hljs-type, .hljs-built_in) { color: #e5b68c; }

/* Without JavaScript there is no switch, so follow the device's appearance. */
@media (prefers-color-scheme: dark) {
    html:not(.js) {
        --desk: #1c1e20;
        --paper: #272927;
        --paper-left: #232523;
        --ink: #e1dfd4;
        --muted: #a5a69a;
        --rule: #43463e;
        --blue: #8fb5f5;
        --blue-hover: #b7d0ff;
        --wash: #30332f;
        --mark: #585036;
        --fold: rgb(0 0 0 / 18%);
        --book-shadow: rgb(0 0 0 / 40%);
        --book-color-scheme: dark;
        --book-scrollbar: #55594e;
    }
    html:not(.js) .brand-logo-light { display: none; }
    html:not(.js) .brand-logo-dark { display: block; }
}

@media (prefers-reduced-motion: reduce) {
    /* Keep a transition event so mdBook can finish hiding its sidebar. */
    html:not(.sidebar-resizing) .sidebar { transition-duration: 0.01ms; }
}

@media print {
    html:is(.light, .rust, .navy, .coal, .ayu), html:not(.js) {
        --paper: #fff; --paper-left: #fff; --ink: #000; --muted: #555;
        --rule: #ccc; --blue: #245bba; --wash: #f3f3f3; --mark: #eee;
        --book-color-scheme: light;
    }
    html, body { color: #000; background: #fff; }
    .site-masthead, .sidebar, .chapter-kicker, .skip-to-content, .nav-wrapper { display: none !important; }
    #mdbook-body-container, #mdbook-body-container:has(#mdbook-sidebar-toggle-anchor:checked) {
        display: block; width: 100%; max-width: none; margin: 0; border: 0; border-radius: 0; box-shadow: none;
    }
    .page-wrapper { min-height: 0; border-radius: 0; box-shadow: none; }
    .page { padding: 0; }
    .content { padding: 0; }
    .content main { max-width: none; }
    .content h1 { font-size: 3.6rem; }
    pre, blockquote, table { break-inside: avoid; }
    .content pre code, .content pre code * { color: #000 !important; background: transparent !important; }
    .content h1, .content h2, .content h3 { break-after: avoid; }
    #introduction + p::first-letter { float: none; margin: 0; font-size: inherit; color: inherit; }
}