/* Keep these tokens in step with public-site/templates/base.html. This layer
   uses mdBook's stock template so search, navigation, and code tools stay native. */
:root {
    --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", system-ui, sans-serif;
    --mono: ui-monospace, SFMono-Regular, "SF Mono", "Noto Sans Mono", Menlo, monospace;
    --mono-font: var(--mono);
    --sidebar-target-width: 280px;
    --content-max-width: 714px;
    --page-padding: 25px;
    --menu-bar-height: 50px;
    --site-header-height: 60px;
    --code-font-size: 13px;
}

html.light, html.rust, html:not(.js) {
    --bg: #FFFFFF;
    --bg-panel: #F6F6F6;
    --fg: #101010;
    --fg-2: #515151;
    --fg-3: #838383;
    --stroke: #B1B1B1;
    --divider: #DADADA;
    --accent: #207FDF;
    --wash: rgba(16, 16, 16, .05);
    --ink-fill: #101010;
    --ink-fill-text: #FFFFFF;
    --color-scheme: light;
}

html.coal, html.navy, html.ayu {
    --bg: #101010;
    --bg-panel: #1D1D1D;
    --fg: #FFFFFF;
    --fg-2: #B4B4B4;
    --fg-3: #8E8E8E;
    --stroke: #565656;
    --divider: #383838;
    --accent: #66B2FF;
    --wash: rgba(255, 255, 255, .05);
    --ink-fill: #FFFFFF;
    --ink-fill-text: #101010;
    --color-scheme: dark;
}

/* Map mdBook's controls to the website palette, including saved theme choices. */
html:root {
    --sidebar-bg: var(--bg);
    --sidebar-fg: var(--fg-2);
    --sidebar-active: var(--accent);
    --sidebar-non-existant: var(--fg-3);
    --sidebar-spacer: var(--divider);
    --sidebar-header-border-color: var(--divider);
    --scrollbar: var(--stroke);
    --icons: var(--fg-2);
    --icons-hover: var(--fg);
    --links: var(--accent);
    --inline-code-color: var(--fg);
    --theme-popup-bg: var(--bg-panel);
    --theme-popup-border: var(--divider);
    --theme-hover: var(--wash);
    --quote-bg: var(--bg-panel);
    --quote-border: var(--divider);
    --table-border-color: var(--divider);
    --table-header-bg: var(--bg-panel);
    --table-alternate-bg: var(--bg);
    --searchbar-border-color: var(--stroke);
    --searchbar-bg: var(--bg-panel);
    --searchbar-fg: var(--fg);
    --searchbar-shadow-color: var(--accent);
    --searchresults-header-fg: var(--fg-2);
    --searchresults-border-color: var(--divider);
    --searchresults-li-bg: var(--wash);
    --search-mark-bg: color-mix(in srgb, var(--accent) 22%, var(--bg));
    --footnote-highlight: var(--accent);
    font-family: var(--sans);
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body { font-size: 17px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
*, *::before, *::after { box-sizing: border-box; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

/* The website header spans both the contents rail and the article. */
.lb-site-header {
    position: fixed;
    inset: 0 0 auto;
    z-index: 200;
    height: var(--site-header-height);
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: saturate(1.4) blur(10px);
    -webkit-backdrop-filter: saturate(1.4) blur(10px);
    border-bottom: 1px solid var(--divider);
}
.lb-site-bar {
    width: 100%;
    height: 100%;
    margin: 0 auto;
    padding: 0 25px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
}
.lb-brand, .lb-brand:visited {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    color: var(--fg);
    font-size: 17px;
    font-weight: 600;
    letter-spacing: -.01em;
    text-decoration: none;
}
.lb-brand svg { width: 22px; height: 22px; color: var(--accent); }
.lb-site-nav, .lb-nav-links { display: flex; align-items: center; gap: 5px; }
.lb-nav-links a, .lb-mobile-links a {
    color: var(--fg-2);
    font-size: 15px;
    padding: 5px 10px;
    border-radius: 8px;
    text-decoration: none;
}
.lb-nav-links a:hover, .lb-nav-links a[aria-current], .lb-mobile-links a:hover {
    color: var(--fg);
    background: var(--wash);
}
.lb-download, .lb-download:visited {
    display: inline-flex;
    align-items: center;
    min-height: 34px;
    padding: 5px 10px;
    border: 1px solid var(--ink-fill);
    border-radius: 8px;
    background: var(--ink-fill);
    color: var(--ink-fill-text);
    font-size: 15px;
    font-weight: 500;
    line-height: 1.4;
    text-decoration: none;
}
.lb-download:hover { opacity: .84; }
.lb-mobile-menu { display: none; }
.lb-mobile-menu summary { cursor: pointer; list-style: none; padding: 5px; border-radius: 8px; }
.lb-mobile-menu summary::-webkit-details-marker { display: none; }
.lb-mobile-menu summary svg { display: block; }
.lb-mobile-menu summary:hover { background: var(--wash); }
.lb-mobile-links {
    position: absolute;
    top: 59px;
    right: 15px;
    min-width: 180px;
    padding: 10px;
    border: 1px solid var(--divider);
    border-radius: 12px;
    background: var(--bg);
}
.lb-mobile-links a { display: block; padding: 10px; }
.lb-skip-link {
    position: fixed;
    top: 10px;
    left: 15px;
    z-index: 201;
    padding: 5px 15px;
    background: var(--bg);
    color: var(--accent);
    transform: translateY(-200%);
}
.lb-skip-link:focus { transform: none; }

/* Keep the global header out of a transformed containing block. On small
   screens the sidebar overlays the article below the always-visible toolbar. */
#mdbook-body-container { padding-top: var(--site-header-height); }
#mdbook-page-wrapper.page-wrapper { transform: none; }
.sidebar { top: var(--site-header-height); border-right: 1px solid var(--divider); }
.sidebar .sidebar-scrollbox { padding: 25px 15px; }
.chapter { margin: 0; font-size: 14px; }
.chapter li.chapter-item { margin-top: 2px; }
.chapter li a { display: block; padding: 5px 10px; border-radius: 8px; }
.chapter-link-wrapper > a { flex: 1; }
.chapter li a:hover { background: var(--wash); color: var(--fg); }
.chapter li a.active { background: var(--wash); color: var(--accent); font-weight: 600; }
.chapter li.part-title {
    padding: 0 10px;
    margin: 25px 0 10px;
    font: 11px/1.5 var(--mono);
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--fg-3);
}
.chapter .section { padding-left: 15px; }
.on-this-page { border-left-width: 1px; margin-left: 10px; padding-left: 5px; }
.on-this-page a { font-size: 13px; }

#mdbook-menu-bar {
    position: sticky;
    top: var(--site-header-height) !important;
    align-items: center;
    border-bottom-color: var(--divider);
    background: var(--bg);
}
html.sidebar-visible #mdbook-menu-bar,
#mdbook-menu-bar.sticky,
#mdbook-menu-bar:hover,
#mdbook-menu-bar-hover-placeholder:hover + #mdbook-menu-bar {
    top: var(--site-header-height) !important;
}
.menu-title { font: 13px/var(--menu-bar-height) var(--mono); color: var(--fg-2); }
#mdbook-menu-bar .icon-button { border-radius: 8px; }
#mdbook-menu-bar .icon-button:hover { background: var(--wash); }
.theme-popup { border-radius: 8px; font-size: 14px; }
.theme-popup .theme { padding: 5px 15px; font: inherit; }
#mdbook-search-wrapper { padding: 15px 0; }
#mdbook-searchbar { border-radius: 8px; font: inherit; }
ul#mdbook-searchresults { padding-left: 0; }
ul#mdbook-searchresults li { padding: 10px; border-radius: 8px; }
#mdbook-help-popup { background: var(--bg-panel); border: 1px solid var(--divider); border-radius: 12px; }

.content { padding: 40px 0 65px; }
.content h1, .content h2, .content h3, .content h4 {
    font-weight: 600;
    letter-spacing: -.02em;
    line-height: 1.15;
    text-wrap: balance;
}
.content h1 { font-size: 34px; margin: 0 0 15px; }
.content h2 { font-size: 22px; margin: 40px 0 10px; }
.content h3 { font-size: 19px; margin: 25px 0 5px; }
.content h4 { font-size: 17px; margin: 25px 0 5px; }
.content p, .content ul, .content ol { margin: 0 0 15px; line-height: 1.6; }
.content li { margin-bottom: 5px; }
.content li > ul, .content li > ol { margin-bottom: 0; }
.content p, .content li { color: var(--fg-2); }
.content strong { color: var(--fg); font-weight: 600; }
.content a { text-underline-offset: 3px; }
.content hr { border: 0; border-top: 1px solid var(--divider); margin: 40px 0; }
.content pre { margin: 15px 0 25px; border: 1px solid var(--divider); border-radius: 8px; background: var(--bg-panel); }
.content pre > code { display: block; padding: 15px; border-radius: inherit; overflow-x: auto; line-height: 1.6; }
.content .hljs { background: var(--bg-panel); color: var(--fg); }
:not(pre) > code { background: var(--bg-panel); border-radius: 4px; padding: 2px 5px; }
pre:focus-within > .buttons { visibility: visible; opacity: 1; }
.content blockquote { margin: 25px 0; padding: 15px 25px; border: 0; border-left: 2px solid var(--accent); border-radius: 0 8px 8px 0; }
.content blockquote > :last-child { margin-bottom: 0; }
.content table { width: 100%; margin: 15px 0 25px; font-size: 15px; }
.content table th, .content table td { padding: 10px 15px; border: 1px solid var(--divider); text-align: left; }
.content table th { font-weight: 600; }
.content img { border-radius: 8px; }
:target { scroll-margin-top: calc(var(--site-header-height) + var(--menu-bar-height) + 15px); }
.nav-wide-wrapper { display: none; }
.nav-wrapper { display: block; max-width: var(--content-max-width); margin: 40px auto 0; padding-top: 15px; border-top: 1px solid var(--divider); }
.mobile-nav-chapters { width: auto; padding: 10px 15px; border: 1px solid var(--divider); border-radius: 8px; font-size: 17px; background: var(--bg); }
.mobile-nav-chapters:hover { background: var(--wash); text-decoration: none; }
.mobile-nav-chapters.previous::after { content: "Previous"; margin-left: 10px; }
.mobile-nav-chapters.next::before { content: "Next"; margin-right: 10px; }

@media (max-width: 859px) {
    .lb-nav-links { display: none; }
    .lb-mobile-menu { display: block; }
}
@media (max-width: 619px) {
    :root { --page-padding: 20px; }
    .lb-site-bar { padding: 0 20px; }
    .sidebar { top: calc(var(--site-header-height) + var(--menu-bar-height)); z-index: 100; box-shadow: 12px 0 25px rgba(0, 0, 0, .12); }
    #mdbook-sidebar-toggle-anchor:checked ~ #mdbook-page-wrapper { margin-inline-start: 0; transform: none; }
    .menu-title { font-size: 11px; }
    .content { padding-top: 25px; }
    .content h1 { font-size: 28px; }
}
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}
@media print {
    .lb-site-header, .lb-skip-link, #mdbook-menu-bar, .nav-wrapper { display: none; }
    #mdbook-body-container { padding-top: 0; }
    .page { margin-top: 0; }
    .content { padding: 0; }
    html:root { --bg: #FFFFFF; --bg-panel: #F6F6F6; --fg: #101010; --fg-2: #515151; --divider: #DADADA; }
}