/* Fonts: MyriadPro-Regular 400, MyriadPro-Semibold(-SC700) 600,
   MyriadPro-Bold(-SC700) 700, MyriadPro-It 400 italic -> Source Sans 3.
   The manual fakes small caps with -SC700 subset faces, so the section heads
   use font-variant-caps rather than text-transform. */
@import url("https://fonts.googleapis.com/css2?family=Source+Sans+3:ital,wght@0,400;0,600;0,700;1,400;1,600&display=swap");

:root {
  --ink: #231f20; /* body ink, the manual's only text colour */
  --brand: #c42637; /* the DISASTER AREA DESIGNS oval; nothing else is this red */
  --rule: #d5d3d0;
  --paper: #ebebeb;
  --charcoal: #2a2e31; /* the enclosure */

  /* LED states. The manual carries this information in colour alone, so these
     are data, not decoration. */
  --led-red: #d22027;
  --led-green: #41b23b;
  --led-blue: #00adef;
  --led-orange: #f9a72b;
  /* darkened for text: the panel greens, blues and oranges fail on white */
  --ink-green: #2c7a28;
  --ink-blue: #0077a8;
  --ink-orange: #9a6100;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}
* {
  margin-top: 0;
}

body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: "Source Sans 3", system-ui, sans-serif;
  font-weight: 400;
  line-height: 1.5;
}

main {
  margin-left: 20vw;
  padding-bottom: 3em;
}

h1,
h2,
h3,
h4 {
  line-height: 1.2;
}

h2 {
  font-size: 2em;
  font-weight: 700;
  font-variant-caps: small-caps;
  letter-spacing: 0.01em;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.1em;
  margin-bottom: 0.7em;
}

h3 {
  font-size: 1.2em;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.6em;
}

/* The three figure panels on page 3 title themselves in plain centred caps */
h3.panel-title {
  font-weight: 400;
  text-align: center;
  letter-spacing: 0.09em;
  margin-bottom: 1em;
}

h4 {
  font-size: 1em;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 0.5em;
}

p,
li {
  break-inside: avoid;
}
h3,
h4,
h5,
h6 {
  break-after: avoid;
}

a {
  color: var(--brand);
}
a:hover {
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
  margin-bottom: 0.75em;
}
.topic > img,
li > img,
figure > img {
  display: block;
}

figure {
  margin: 0 0 1em;
}
figure > img {
  border: 1px solid var(--rule);
}
figcaption {
  font-size: 0.85em;
  font-style: italic;
  margin-bottom: 1em;
}

code,
.file {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  background: var(--paper);
  padding: 0.05em 0.3em;
}

/* MASTHEAD */
#masthead {
  text-align: center;
  padding: 2.5em 1.5em 2em;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 2.5em;
}
#masthead h1 {
  font-size: 2.8em;
  font-weight: 600;
  margin-bottom: 0.1em;
}
#masthead h1 img {
  display: block;
  width: 130px;
  margin: 0 auto 0.4em;
}
#masthead .subtitle {
  font-weight: 600;
  font-size: 1.05em;
  margin-bottom: 1.5em;
}
#masthead .pedal {
  max-width: 600px;
  width: 100%;
}
#masthead .doc-kind {
  font-size: 2.6em;
  font-weight: 700;
  margin-bottom: 0.1em;
}
#masthead .doc-version {
  font-size: 0.85em;
  margin: 0;
}

/* NAV */
#side-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 20vw;
  height: 100%;
  overflow-y: auto;
  background: #fff;
  border-right: 1px solid var(--rule);
  z-index: 5;
}
.nav-container {
  display: flex;
  flex-direction: column;
  margin: 1.5em 1em;
}
#side-nav h3 {
  font-size: 1em;
  margin-bottom: 0.8em;
}
#side-nav h4,
#side-nav h5 {
  font-weight: 600;
  text-transform: none;
  letter-spacing: 0;
  margin-bottom: 0.45em;
}
#side-nav h4 {
  font-size: 0.95em;
}
#side-nav h5 {
  font-size: 0.85em;
  font-weight: 400;
  margin-left: 1em;
}
#side-nav a {
  color: inherit;
  text-decoration: none;
}
#side-nav a:hover {
  color: var(--brand);
}

#toc-mobile h2 {
  font-size: 1.4em;
}
#toc-mobile ul {
  list-style: none;
  padding-left: 0;
}
#toc-mobile a {
  color: inherit;
}

/* SECTIONS */
section + section {
  margin-top: 3em;
}
.flex-container {
  display: flex;
  padding-left: 2em;
}
.half-container {
  width: 100%;
  padding: 0 1em;
  container-type: inline-size;
}
.half-container > header {
  column-span: all;
}
.topic {
  columns: 2 30rem;
  column-gap: 3em;
}
.no-columns {
  columns: auto !important;
}
.flow > * + * {
  margin-bottom: 1em;
}

.keep-together {
  break-inside: avoid;
}
:has(+ p > .menu-path:only-child) {
  break-after: avoid;
}
/* 63rem = the two-column threshold of `columns: 2 30rem` */
@container (min-width: 63rem) {
  .column-end {
    break-after: column;
  }
}

/* The page-3 and page-4 panels: figure beside its two short paragraphs */
.panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 0 2em;
  align-items: center;
}
.panel > h3 {
  grid-column: 1 / -1;
}
.panel img {
  width: 100%;
}
.panel p:last-child {
  margin-bottom: 0;
}

/* Changelog banner */
.doc-update {
  background: var(--paper);
  border-left: 4px solid var(--brand);
  padding: 1em 1.25em;
  font-size: 0.92em;
  margin-bottom: 1.5em;
}
.doc-update > strong {
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.4em;
}
.doc-update p:last-child {
  margin-bottom: 0;
}

/* TABLES — the manual rules nothing, but its columns are set far enough apart
   to read as columns; on screen that job falls to hairlines. */
.table-scroll {
  overflow-x: auto;
  margin-bottom: 1em;
}
.doc-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92em;
}
.doc-table th,
.doc-table td {
  padding: 0.45em 0.9em;
  text-align: left;
  vertical-align: top;
}
.doc-table th:first-child,
.doc-table td:first-child {
  padding-left: 0;
}
.doc-table th:last-child,
.doc-table td:last-child {
  padding-right: 0;
}
.doc-table:not(.led-table) th:not(:last-child),
.doc-table:not(.led-table) td:not(:last-child) {
  border-right: 1px solid var(--rule);
}
.doc-table thead th {
  font-weight: 700;
  border-bottom: 2px solid var(--ink);
}
.doc-table td,
.doc-table th[scope="row"] {
  border-bottom: 1px solid var(--rule);
}
.doc-table th[scope="row"] {
  font-weight: 400;
}
.doc-table .row-label {
  font-style: italic;
  font-weight: 400;
}

/* LED state table (Loop Selection Order). Columns run C, B, A, as on the lid. */
.led-table {
  width: auto;
  min-width: 18rem;
  margin-inline: auto;
}
.led-table th,
.led-table td {
  text-align: center;
  padding-right: 0.35em;
}
.led-table th:last-child,
.led-table td:last-child {
  text-align: left;
  padding-left: 1.5em;
  font-variant-caps: all-small-caps;
  letter-spacing: 0.05em;
  font-weight: 600;
  font-size: 1.1em;
}
.led {
  display: inline-block;
  width: 0.85em;
  height: 0.85em;
  border-radius: 50%;
  border: 1px solid var(--ink);
  background: #fff;
  vertical-align: -0.05em;
}
.led.on.a {
  background: var(--led-red);
}
.led.on.b {
  background: var(--led-green);
}
.led.on.c {
  background: var(--led-blue);
}

/* Colour words the manual prints in the colour they name */
.c-red {
  color: var(--led-red);
}
.c-green {
  color: var(--ink-green);
}
.c-blue {
  color: var(--ink-blue);
}
.c-orange {
  color: var(--ink-orange);
}

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

footer {
  margin-left: 20vw;
  border-top: 1px solid var(--rule);
  padding: 1.5em 3em;
  font-size: 0.85em;
}

@media (max-width: 900px) {
  .flex-container {
    flex-direction: column;
    padding-left: 0;
  }
  .half-container {
    width: 100%;
    padding: 0 1em;
  }
  nav {
    display: none;
  }
  main,
  footer {
    margin: 0 auto;
  }
  footer {
    padding: 1.5em 1em;
  }
  .panel {
    grid-template-columns: 1fr;
  }
  #toc-mobile {
    display: block;
  }
  /* the hook-up and rear-panel labels go to ~4px if these shrink to 390px */
  .wide-figure {
    overflow-x: auto;
  }
  .wide-figure img {
    min-width: 640px;
  }
}

/* 901, not 900: both queries match at exactly 900px, and the later one would
   hide the mobile TOC on the same width that hides the nav */
@media (min-width: 901px) {
  #toc-mobile {
    display: none;
  }
}