/* franka-rs guide: mdBook restyled to match the landing page (docs/site/site.css).
   Loaded after mdBook's own stylesheets through additional-css; overrides only, the
   template is untouched. Sizes are in px because mdBook's root font size is 62.5 %.

   Markup for guide pages. Links stay Markdown (.md, rewritten to .html by mdBook) so the
   same source also reads on GitHub; the class goes on a wrapper element, with a blank line
   after the opening tag so the Markdown inside is still parsed.

     <div class="setup-path">

     1. [**Hardware**](./pi-hardware.md)\
        What to buy and how to put it together.

     </div>

     <nav class="guide-nav" aria-label="Guide steps">

     [← Overview](./raspberry-pi.md)

     [2. System and network →](./pi-system.md)

     </nav>

     <div class="parts-table">          <table class="parts-table"> works too

     | part | qty | note |               (blank line before and after the table)
     |---|---|---|

     </div>

     <figure class="hardware-figure">
       <img src="../img/pi-case.jpg" alt="…">      several images: wrap them in one <div>
       <figcaption>…</figcaption>
     </figure>
*/

/* Palette. The light theme is the landing page; ayu (the automatic dark theme) is the
   landing page's dark section. navy, coal and rust keep mdBook's colours and take the
   guide-* values from them, so every custom block stays readable there. */

:root {
  --guide-serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --guide-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --guide-mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --mono-font: var(--guide-mono);
  --content-max-width: 760px;
  --sidebar-width: 290px;
  --page-padding: 24px;
  --guide-accent: var(--links);
  --guide-muted: var(--icons);
  --guide-line: var(--table-border-color);
  --guide-surface: var(--quote-bg);
  --guide-surface-2: var(--sidebar-bg);
  --guide-code-bg: var(--quote-bg);
}

.light {
  --bg: #f4efe6;
  --fg: #221f1c;
  --sidebar-bg: #ebe4d7;
  --sidebar-fg: #221f1c;
  --sidebar-non-existant: #8a8377;
  --sidebar-active: #a8300f;
  --sidebar-spacer: #d6cdbd;
  --scrollbar: #b6ae9f;
  --icons: #5d5750;
  --icons-hover: #221f1c;
  --links: #a8300f;
  --inline-code-color: #4a2a12;
  --theme-popup-bg: #f4efe6;
  --theme-popup-border: #d6cdbd;
  --theme-hover: #e2dac9;
  --quote-bg: #ebe4d7;
  --quote-border: #d6cdbd;
  --warning-border: #bc3b18;
  --table-border-color: #d6cdbd;
  --table-header-bg: #ebe4d7;
  --table-alternate-bg: #f0eadf;
  --searchbar-border-color: #d6cdbd;
  --searchbar-bg: #fbf8f2;
  --searchbar-fg: #221f1c;
  --searchbar-shadow-color: #d6cdbd;
  --searchresults-header-fg: #5d5750;
  --searchresults-border-color: #d6cdbd;
  --searchresults-li-bg: #ebe4d7;
  --search-mark-bg: #f3c9b8;
  --color-scheme: light;
  --guide-accent: #a8300f;
  --guide-muted: #5d5750;
  --guide-line: #d6cdbd;
  --guide-surface: #ebe4d7;
  --guide-surface-2: #fbf8f2;
  --guide-code-bg: #ece5d6;
}

.ayu {
  --bg: #16140f;
  --fg: #f1ebe0;
  --sidebar-bg: #100e0a;
  --sidebar-fg: #d8d0c2;
  --sidebar-non-existant: #6d675c;
  --sidebar-active: #f19a7d;
  --sidebar-spacer: #3a362e;
  --scrollbar: #3a362e;
  --icons: #b6ae9f;
  --icons-hover: #f1ebe0;
  --links: #f19a7d;
  --inline-code-color: #f1ebe0;
  --theme-popup-bg: #22201a;
  --theme-popup-border: #3a362e;
  --theme-hover: #2c2922;
  --quote-bg: #22201a;
  --quote-border: #3a362e;
  --table-border-color: #3a362e;
  --table-header-bg: #22201a;
  --table-alternate-bg: #1b1913;
  --searchbar-border-color: #3a362e;
  --searchbar-bg: #22201a;
  --searchbar-fg: #f1ebe0;
  --searchbar-shadow-color: #100e0a;
  --searchresults-header-fg: #b6ae9f;
  --searchresults-border-color: #3a362e;
  --searchresults-li-bg: #2c2922;
  --search-mark-bg: #7a3a22;
  --guide-accent: #f19a7d;
  --guide-muted: #b6ae9f;
  --guide-line: #3a362e;
  --guide-surface: #22201a;
  --guide-surface-2: #1b1913;
  --guide-code-bg: #100e0a;
}

/* Frame */

html { font-family: var(--guide-sans); }
:focus-visible { outline: 2px solid var(--guide-accent); outline-offset: 2px; }

#menu-bar { border-bottom: 1px solid var(--guide-line); }
.menu-title {
  font-family: var(--guide-serif);
  font-size: 21px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.sidebar {
  font-family: var(--guide-sans);
  font-size: 14px;
  border-right: 1px solid var(--guide-line);
}
.sidebar .sidebar-scrollbox { padding: 12px 14px 48px; }
.chapter { line-height: 1.4; }
.chapter li.chapter-item { margin-block-start: 2px; line-height: 1.4; }
.chapter li a {
  padding: 4px 8px;
  border-radius: 5px;
  color: var(--sidebar-fg);
}
.chapter li a:hover { background: var(--theme-hover); color: var(--sidebar-fg); }
.chapter li a.active { color: var(--sidebar-active); font-weight: 600; }
.chapter li > a.toggle { padding: 0 8px; opacity: 0.6; }
.chapter li > a.toggle:hover { background: none; opacity: 1; }
.chapter li.part-title {
  margin: 20px 0 4px;
  padding: 0 8px;
  font-family: var(--guide-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--guide-accent);
}
.chapter li.affix + li.part-title { margin-top: 16px; }
.chapter .section { padding-inline-start: 14px; line-height: 1.4; }
.chapter .spacer { height: 1px; margin: 14px 8px 6px; background: var(--sidebar-spacer); }

/* Collapsible groups, added by guide.js */
.chapter li.part-title > .guide-part-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  padding: 2px 0;
  border: 0;
  background: none;
  font: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
  text-align: left;
  color: inherit;
  cursor: pointer;
}
.chapter li.part-title > .guide-part-toggle::after {
  content: "";
  width: 6px;
  height: 6px;
  border: solid currentColor;
  border-width: 0 1.5px 1.5px 0;
  transform: rotate(45deg);
  transition: transform 0.2s;
  opacity: 0.7;
}
.chapter li.part-title > .guide-part-toggle[aria-expanded="false"]::after { transform: rotate(-45deg); }
.chapter li.guide-hidden { display: none; }
@media (prefers-reduced-motion: reduce) {
  .chapter li.part-title > .guide-part-toggle::after { transition: none; }
}

/* Content */

.content { padding: 0 8px 64px; }
.content main {
  font-family: var(--guide-sans);
  font-size: 16.5px;
  line-height: 1.6;
  padding-top: 8px;
}
.content p, .content ol, .content ul { line-height: 1.6; }
.content p { margin: 0 0 1em; }
.content li { margin-bottom: 0.3em; }
.content li > p { margin-bottom: 0.5em; }

.content h1, .content h2, .content h3 {
  font-family: var(--guide-serif);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.15;
  text-wrap: balance;
}
.content h1 { font-size: 2em; margin: 0.5em 0 0.75em; }
.content h1::after {
  content: "";
  display: block;
  width: 40px;
  height: 3px;
  margin-top: 14px;
  background: var(--guide-accent);
}
.content h2 { font-size: 1.45em; margin: 1.9em 0 0.55em; }
.content h3 { font-size: 1.15em; margin: 1.6em 0 0.45em; }
.content h4, .content h5, .content h6 {
  font-family: var(--guide-sans);
  font-size: 1em;
  font-weight: 650;
  margin: 1.4em 0 0.4em;
}
.content .header + .header h3, .content .header + .header h4 { margin-top: 0.6em; }
.content h1 code, .content h2 code, .content h3 code { font-size: 0.85em; }

.content a { color: var(--links); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 0.15em; text-decoration-color: color-mix(in srgb, currentColor 40%, transparent); }
.content a:hover { text-decoration-color: currentColor; }
.content .header:link, .content .header:visited { text-decoration: none; }

.content :not(pre) > code {
  padding: 0.1em 0.35em;
  border-radius: 4px;
  background: var(--guide-surface);
  color: var(--inline-code-color);
  font-size: 0.88em;
}
.content pre { margin: 1.1em 0 1.3em; }
.content pre > code {
  padding: 14px 16px;
  border-radius: 8px;
  line-height: 1.55;
}
.light pre > code.hljs, .ayu pre > code.hljs { background: var(--guide-code-bg); }

.content blockquote {
  margin: 1.3em 0;
  padding: 0.7em 1em;
  border: 0;
  border-left: 3px solid var(--guide-accent);
  border-radius: 0 6px 6px 0;
  background: var(--quote-bg);
}
.content blockquote p { margin: 0.35em 0; }

.content hr { margin: 2em 0; border: 0; border-top: 1px solid var(--guide-line); }
.content img { max-width: 100%; height: auto; }

/* Tables scroll sideways on a narrow screen instead of breaking the page. */
.content table {
  display: block;
  width: max-content;
  max-width: 100%;
  overflow-x: auto;
  margin: 1.2em 0;
  border: 1px solid var(--guide-line);
  border-radius: 6px;
  font-size: 0.94em;
  line-height: 1.45;
}
.content table th, .content table td {
  padding: 7px 12px;
  border: 0;
  border-bottom: 1px solid var(--guide-line);
  vertical-align: top;
  text-align: left;
}
.content table thead { background: var(--table-header-bg); }
.content table thead th, .content table thead td { font-weight: 650; }
.content table thead tr { border: 0; }
.content table tbody tr:nth-child(2n) { background: transparent; }
.content table tbody tr:last-child td { border-bottom: 0; }

/* Parts lists: full width, first column is the part. */
.content .parts-table { margin: 1.2em 0; overflow-x: auto; }
.content .parts-table table, .content table.parts-table {
  display: table;
  width: 100%;
  min-width: 480px;
  margin: 0;
}
.content .parts-table td:first-child, .content table.parts-table td:first-child { font-weight: 600; }
.content .parts-table td:nth-child(2), .content table.parts-table td:nth-child(2) { white-space: nowrap; }

/* Ordered setup cards. The card is the list item: the linked title on the first line, the
   description beneath it after a hard line break. */
.content .setup-path { margin: 1.4em 0; }
.content .setup-path ol {
  list-style: none;
  counter-reset: setup-step;
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
}
.content .setup-path li {
  counter-increment: setup-step;
  position: relative;
  margin: 0;
  padding: 13px 16px 14px 50px;
  border: 1px solid var(--guide-line);
  border-radius: 8px;
  background: var(--guide-surface-2);
  color: var(--guide-muted);
  font-size: 0.94em;
}
/* Absolute, not a grid column: a grid container would blockify the title link and the
   description into separate items and break the hard line break between them. */
.content .setup-path li::before {
  content: counter(setup-step);
  position: absolute;
  left: 17px;
  top: 12px;
  font-family: var(--guide-serif);
  font-size: 1.5em;
  line-height: 1.3;
  color: var(--guide-accent);
}
/* Only the title is a link, so the card lights up for the title's hover, not the whole
   card: no affordance where a click would do nothing. */
.content .setup-path li:has(a:hover) { border-color: var(--guide-accent); }
.content .setup-path li > p { margin: 0; }
.content .setup-path a {
  display: inline-block;
  font-family: var(--guide-serif);
  font-size: 1.22em;
  line-height: 1.35;
  color: var(--fg);
  text-decoration: none;
}
.content .setup-path a:hover { text-decoration: underline; }
.content .setup-path strong { font-weight: 500; }

/* Previous / next inside a guide. Each link is its own paragraph, so the flex row lays
   out the paragraphs; the arrows are part of the link text and read on GitHub too. */
.content nav.guide-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin: 2.5em 0 0.5em;
  padding-top: 1.2em;
  border-top: 1px solid var(--guide-line);
  font-size: 0.95em;
}
.content .guide-nav p { margin: 0; }
.content .guide-nav p:last-child { margin-left: auto; }
.content .guide-nav a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border: 1.5px solid var(--fg);
  border-radius: 999px;
  color: var(--fg);
  font-weight: 600;
  text-decoration: none;
}
.content .guide-nav a:hover { background: var(--fg); color: var(--bg); }

/* Photos and drawings of the build */
.content figure.hardware-figure { margin: 1.5em 0; padding: 0; }
.content .hardware-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--guide-line);
  border-radius: 8px;
  background: var(--guide-surface);
}
.content .hardware-figure > div {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
}
.content .hardware-figure figcaption { margin-top: 8px; font-size: 0.9em; color: var(--guide-muted); }

/* Small screens */
@media (max-width: 720px) {
  :root { --page-padding: 16px; }
  .content main { font-size: 16px; }
  .content h1 { font-size: 1.7em; }
  .content h2 { font-size: 1.3em; }
  .content .setup-path li { padding: 11px 14px 12px 44px; }
  .content .setup-path li::before { left: 15px; top: 10px; }
  .content .guide-nav a { padding: 7px 13px; }
}

@media print {
  .content nav.guide-nav { display: none; }
  .content h1::after { display: none; }
}

/* Flow diagrams keep readable type on phones; only the figure scrolls. */
.content figure.flow-figure { margin: 1.5em 0; }
.content .flow-scroll { overflow-x: auto; border-radius: 12px; }
.content .flow-scroll:focus-visible { outline: 2px solid var(--fg); outline-offset: 3px; }
.content .flow-scroll img { display: block; width: 100%; min-width: 660px; max-width: none; height: auto; }
.content .flow-figure figcaption { margin-top: 10px; font-size: 0.9em; color: var(--guide-muted); }
@media print {
  .content .flow-scroll { overflow: visible; }
  .content .flow-scroll img { min-width: 0; }
}