/* Fonts: HelveticaNeue -> system sans stack (closest free match: Helvetica Neue itself) */

:root {
  --ink: #1a1a1a;
  --accent: #e2000a;
  --paper: #f5f5f5;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: #fff;
  font-size: 16px;
  line-height: 1.5;
}

a {
  color: var(--accent);
}

img {
  max-width: 100%;
  height: auto;
  margin-bottom: 0.75em;
}

/* --- nav --- */

#side-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 20vw;
  height: 100%;
  overflow-y: auto;
  border-right: 1px solid var(--ink);
}

.nav-container {
  padding: 2em 1.5em;
}

.nav-container h3 {
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.85em;
  margin: 0 0 1em;
}

.nav-container h4 {
  font-weight: 400;
  font-size: 0.95em;
  margin: 0.6em 0;
}

#side-nav a {
  color: inherit;
  text-decoration: none;
}

#side-nav a:hover {
  color: var(--accent);
}

#toc-mobile {
  display: none;
}

/* --- layout --- */

main {
  margin-left: 20vw;
}

.flex-container {
  display: flex;
  padding-left: 2em;
  padding-right: 2em;
}

.half-container {
  width: 100%;
  padding: 0 1em;
}

.no-columns {
  columns: auto !important;
}

.half-container > header {
  column-span: all;
}

section + section {
  margin-top: 3em;
}

.flow > * + * {
  margin-bottom: 1em;
}

.keep-together {
  break-inside: avoid;
}

p,
li {
  break-inside: avoid;
}

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

/* --- masthead --- */

#masthead {
  padding: 3em 0 2.5em;
  border-bottom: 1px solid var(--ink);
}

#masthead .flex-container {
  align-items: center;
}

#masthead h1 {
  margin: 1.5em 0 0;
  line-height: 1.1;
}

#masthead h1 img {
  display: block;
  height: 2.5em;
  width: auto;
  margin-bottom: 0.75em;
}

#masthead h1 span {
  display: block;
  font-size: 1.8em;
  font-weight: 700;
}

.masthead-photo {
  max-width: 260px;
  margin: 0 auto;
  display: block;
}

/* --- headings --- */

h2 {
  font-size: 1.3em;
  font-weight: 700;
  margin: 0 0 1em;
  padding-top: 0.5em;
  border-top: 1px solid var(--ink);
}

h3 {
  font-size: 1.05em;
  font-weight: 700;
  margin: 1.2em 0 0.4em;
}

.url {
  margin-top: 2em;
}

/* --- external controls --- */

.controls-wrapper {
  column-span: all;
  display: grid;
  grid-template-columns: minmax(14em, 20em) 1fr;
  gap: 2em;
  align-items: center;
}

.controls-wrapper img {
  margin: 0;
}

.controls-list {
  padding-left: 1.4em;
  margin: 0;
}

.controls-list li {
  margin-bottom: 0.6em;
}

/* --- table --- */

.doc-table {
  width: 100%;
  border-collapse: collapse;
}

.doc-table th,
.doc-table td {
  text-align: left;
  font-weight: 400;
  padding: 0.5em 0;
  border-bottom: 1px solid var(--paper);
}

.doc-table th {
  width: 40%;
  font-weight: 700;
}

.table-scroll {
  overflow-x: auto;
}

footer {
  margin-left: 20vw;
  padding: 2em;
  font-size: 0.85em;
  color: #666;
  border-top: 1px solid var(--ink);
}

/* --- responsive --- */

@media (max-width: 900px) {
  #side-nav {
    display: none;
  }

  main,
  footer {
    margin-left: 0;
  }

  .flex-container {
    flex-direction: column;
    padding-left: 1.25em;
    padding-right: 1.25em;
  }

  .half-container {
    width: 100%;
    padding: 0;
  }

  #toc-mobile {
    display: block;
  }

  #masthead .flex-container {
    flex-direction: column-reverse;
  }

  .controls-wrapper {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 901px) {
  #toc-mobile {
    display: none;
  }
}