/* ==========================================================================
   CAT manual
   Light and dark themes are defined as custom properties. The theme follows
   the operating system unless the reader picks one with the toggle, which
   sets data-theme="light|dark" on <html> (see the inline script in head).
   ========================================================================== */

@font-face {
  font-family: "Inter";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("../webfonts/inter-latin-wght-normal.woff2") format("woff2");
}

@font-face {
  font-family: "Inter";
  font-style: italic;
  font-weight: 100 900;
  font-display: swap;
  src: url("../webfonts/inter-latin-wght-italic.woff2") format("woff2");
}

/* ─── Design tokens ──────────────────────────────────────────── */

:root {
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --header-h: 3.5rem;
  --sidebar-w: 18rem;
  --content-w: 48rem;
  --radius: 10px;
  --radius-sm: 6px;

  --brand: #4f9be6;                       /* blue of the CAT logo, for lines (as on the CAT website) */
  --bg: #ffffff;
  --bg-soft: #f5f7fa;
  --bg-hover: #edf1f5;
  --border: #e0e6ed;
  --border-strong: #cbd4de;
  --text: #1f2731;
  --text-soft: #4b5664;
  --text-muted: #687483;
  --heading: #0d131a;
  --link: #1c6dcc;
  --link-hover: #1659a8;
  --link-line: rgba(28, 109, 204, 0.3);
  --action: #0b6f8a;                      /* links that run MATLAB code */
  --accent-bg: #eaf3fc;
  --tag-bg: #a8d8e8;                      /* cyan bar of the CAT logo */
  --tag-text: #0e2c52;
  --row-alt: #f4f7fb;
  --code-bg: #f3f5f7;
  --mark: #fcef9c;
  --img-bg: transparent;
  --img-filter: none;
  --header-bg: rgba(255, 255, 255, 0.85);
  --backdrop: rgba(13, 19, 26, 0.35);
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.05), 0 10px 28px rgba(16, 24, 40, 0.1);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --brand: #4f9be6;
    --bg: #0e1216;
    --bg-soft: #12171c;
    --bg-hover: #1b222a;
    --border: #27303a;
    --border-strong: #36414d;
    --text: #d3dae2;
    --text-soft: #a9b4c0;
    --text-muted: #8893a0;
    --heading: #f1f4f7;
    --link: #79b8ff;
    --link-hover: #9ccaff;
    --link-line: rgba(121, 184, 255, 0.35);
    --action: #8fd3e3;
    --accent-bg: #10233a;
    --row-alt: #151b22;
    --code-bg: #1a2027;
    --mark: rgba(250, 204, 21, 0.3);
    --img-bg: #f2f4f6;
    --img-filter: brightness(0.92);
    --header-bg: rgba(14, 18, 22, 0.85);
    --backdrop: rgba(0, 0, 0, 0.55);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 28px rgba(0, 0, 0, 0.45);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --brand: #4f9be6;
  --bg: #0e1216;
  --bg-soft: #12171c;
  --bg-hover: #1b222a;
  --border: #27303a;
  --border-strong: #36414d;
  --text: #d3dae2;
  --text-soft: #a9b4c0;
  --text-muted: #8893a0;
  --heading: #f1f4f7;
  --link: #79b8ff;
  --link-hover: #9ccaff;
  --link-line: rgba(121, 184, 255, 0.35);
  --action: #8fd3e3;
  --accent-bg: #10233a;
  --row-alt: #151b22;
  --code-bg: #1a2027;
  --mark: rgba(250, 204, 21, 0.3);
  --img-bg: #f2f4f6;
  --img-filter: brightness(0.92);
  --header-bg: rgba(14, 18, 22, 0.85);
  --backdrop: rgba(0, 0, 0, 0.55);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 10px 28px rgba(0, 0, 0, 0.45);
  color-scheme: dark;
}

/* ─── Base ───────────────────────────────────────────────────── */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 1.25rem);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.7;
  font-feature-settings: "cv05", "cv08";   /* l and I distinguishable from 1 */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

button, input {
  font: inherit;
  color: inherit;
}

::selection {
  background: rgba(79, 155, 230, 0.28);
}

:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 100;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius-sm);
  background: var(--heading);
  color: var(--bg);
  font-weight: 600;
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: none;
}

.icon {
  width: 1.125rem;
  height: 1.125rem;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ─── Top bar ────────────────────────────────────────────────── */

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  height: var(--header-h);
  padding: 0 1rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

@supports ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
  .topbar {
    background: var(--header-bg);
    -webkit-backdrop-filter: saturate(180%) blur(12px);
    backdrop-filter: saturate(180%) blur(12px);
  }
}

.brand {
  display: flex;
  align-items: center;
  flex: none;
  margin-right: 1.25rem;
  color: var(--heading);
  font-size: 1rem;
  font-weight: 650;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.brand img {
  display: block;
  width: auto;
  height: 1.875rem;
  margin-right: 0.6rem;
  border-radius: 4px;
}

.brand-sub {
  margin-left: 0.3rem;
  color: var(--text-muted);
  font-weight: 500;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-soft);
  cursor: pointer;
  transition: background-color 0.15s, color 0.15s;
}

.icon-btn:hover {
  background: var(--bg-hover);
  color: var(--heading);
}

.icon-btn + .icon-btn {
  margin-left: 0.25rem;
}

.icon-fill {
  fill: currentColor;
  stroke: none;
}

.menu-btn {
  margin: 0 0.5rem 0 -0.375rem;
}

/* Theme toggle shows the theme it switches to. */
.theme-toggle .icon-sun {
  display: none;
}

:root[data-theme="dark"] .theme-toggle .icon-sun {
  display: block;
}

:root[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun {
    display: block;
  }

  :root:not([data-theme="light"]) .theme-toggle .icon-moon {
    display: none;
  }
}

/* ─── Search ─────────────────────────────────────────────────── */

.search {
  position: relative;
  flex: 1 1 auto;
  min-width: 0;
  max-width: 28rem;
  margin: 0 0.5rem 0 auto;
}

.search .icon {
  position: absolute;
  top: 50%;
  left: 0.7rem;
  width: 1rem;
  height: 1rem;
  margin-top: -0.5rem;
  color: var(--text-muted);
  pointer-events: none;
}

.search input {
  width: 100%;
  height: 2.25rem;
  padding: 0 2.4rem 0 2.2rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  font-size: 0.875rem;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  transition: border-color 0.15s, box-shadow 0.15s, background-color 0.15s;
}

.search input::placeholder {
  color: var(--text-muted);
}

.search input:focus {
  border-color: var(--brand);
  background: var(--bg);
  box-shadow: 0 0 0 3px var(--accent-bg);
}

.search input::-webkit-search-cancel-button {
  display: none;
}

.search kbd {
  position: absolute;
  top: 50%;
  right: 0.55rem;
  margin-top: -0.6rem;
  padding: 0 0.4rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  line-height: 1.1rem;
  pointer-events: none;
}

.search input:focus ~ kbd {
  display: none;
}

.search-results {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  z-index: 50;
  width: 36rem;
  max-width: calc(100vw - 2rem);
  max-height: calc(100vh - var(--header-h) - 2rem);
  overflow-y: auto;
  padding: 0.375rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  box-shadow: var(--shadow);
}

.search-results[hidden] {
  display: none;
}

.search-result {
  display: block;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text);
}

.search-result:hover,
.search-result.selected {
  background: var(--bg-hover);
}

.search-result-title {
  display: block;
  color: var(--heading);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.4;
}

.search-result-path {
  display: block;
  margin-top: 0.1rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  line-height: 1.4;
}

.search-result-snippet {
  display: block;
  margin-top: 0.2rem;
  color: var(--text-soft);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.search-badge {
  display: inline-block;
  margin-right: 0.4rem;
  padding: 0 0.4rem;
  border-radius: 4px;
  background: var(--bg-hover);
  color: var(--text-soft);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.25rem;
  text-transform: uppercase;
  vertical-align: 0.05em;
}

.search-badge.faq {
  background: var(--tag-bg);
  color: var(--tag-text);
}

.search-no-result {
  margin: 0;
  padding: 0.75rem;
  color: var(--text-muted);
  font-size: 0.875rem;
}

mark {
  padding: 0 0.1em;
  border-radius: 2px;
  background: var(--mark);
  color: inherit;
}

/* ─── Layout ─────────────────────────────────────────────────── */

.layout {
  display: flex;
  align-items: flex-start;
}

.sidebar {
  position: -webkit-sticky;
  position: sticky;
  top: var(--header-h);
  flex: none;
  width: var(--sidebar-w);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 1.5rem 0.75rem 2.5rem;
  border-right: 1px solid var(--border);
  background: var(--bg-soft);
  scrollbar-width: thin;
}

.content {
  flex: 1 1 auto;
  min-width: 0;
  padding: 0 2.5rem 2rem;
}

.doc {
  max-width: var(--content-w);
  margin: 0 auto;
  overflow-wrap: break-word;   /* long file names, URLs and code must not widen the page */
  word-wrap: break-word;
}

.backdrop {
  display: none;
}

/* ─── Sidebar navigation ─────────────────────────────────────── */

.nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-title {
  margin: 0 0 0.5rem;
  padding: 0 0.75rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav a {
  display: block;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.4;
  transition: background-color 0.15s, color 0.15s;
}

.nav a:hover {
  background: var(--bg-hover);
  color: var(--heading);
}

.nav a.active {
  background: var(--accent-bg);
  color: var(--link);
  font-weight: 600;
}

.nav-group.has-active > .nav-row > a {
  color: var(--heading);
  font-weight: 600;
}

.nav-row {
  display: flex;
  align-items: center;
}

.nav-row > a {
  flex: 1 1 auto;
  min-width: 0;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  width: 1.75rem;
  height: 1.75rem;
  margin-left: 0.125rem;
  padding: 0;
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}

.nav-toggle:hover {
  background: var(--bg-hover);
  color: var(--heading);
}

.nav-toggle .icon {
  width: 0.875rem;
  height: 0.875rem;
  transition: transform 0.2s;
}

.nav-group.open > .nav-row .nav-toggle .icon {
  transform: rotate(90deg);
}

.nav li > ul {
  margin: 0.125rem 0 0.5rem 0.95rem;
  padding-left: 0.5rem;
  border-left: 1px solid var(--border);
}

.nav li > ul a {
  padding: 0.3rem 0.6rem;
  font-size: 0.8125rem;
  font-weight: 400;
}

.js .nav-group:not(.open) > ul {
  display: none;
}

/* ─── Document header ────────────────────────────────────────── */

.doc-header {
  padding: 3rem 0 0.5rem;
}

.doc .eyebrow {
  margin: 0 0 0.5rem;
  color: var(--link);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.doc .lead {
  max-width: 40rem;
  margin: 1rem 0 0;
  color: var(--text-soft);
  font-size: 1.125rem;
  line-height: 1.6;
}

.doc .doc-version {
  margin: 0.75rem 0 0;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.doc .callout {
  margin: 2rem 0 0;
  padding: 0.875rem 1.1rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--brand);
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  color: var(--text-soft);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.doc .toc {
  margin: 2.5rem 0 0;
}

.doc .toc-title {
  margin: 0 0 0.75rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.doc .toc ol {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(14rem, 1fr));
  grid-gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: toc;
}

.doc .toc li {
  margin: 0;
}

.doc .toc a {
  display: flex;
  align-items: baseline;
  height: 100%;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.4;
  text-decoration: none;
  transition: border-color 0.15s, background-color 0.15s;
}

.doc .toc a::before {
  flex: none;
  width: 1.6rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  counter-increment: toc;
  content: counter(toc, decimal-leading-zero);
}

.doc .toc a:hover {
  border-color: var(--brand);
  background: var(--accent-bg);
  color: var(--heading);
}

/* ─── Typography ─────────────────────────────────────────────── */

.doc h1,
.doc h2,
.doc h3,
.doc h4,
.doc h5,
.doc h6 {
  margin: 0;
  color: var(--heading);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.doc h1 {
  font-size: 2.5rem;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.doc h2 {
  position: relative;
  clear: both;
  margin: 4.5rem 0 1.25rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border);
  font-size: 1.75rem;
  letter-spacing: -0.022em;
}

.doc h2::before {
  position: absolute;
  top: -2px;
  left: 0;
  width: 2.5rem;
  height: 3px;
  border-radius: 3px;
  background: var(--brand);
  content: "";
}

.doc h3 {
  clear: both;
  margin: 2.75rem 0 0.875rem;
  font-size: 1.3rem;
}

.doc h4 {
  margin: 2.25rem 0 0.625rem;
  font-size: 1.0625rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.doc h5 {
  margin: 2rem 0 0.5rem;
  font-size: 1rem;
  font-weight: 650;
  letter-spacing: -0.005em;
}

.doc h6 {
  margin: 1.75rem 0 0.5rem;
  color: var(--text-soft);
  font-size: 0.8125rem;
  font-weight: 650;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.doc h2 + h3,
.doc h3 + h4,
.doc h4 + h5 {
  margin-top: 1.25rem;
}

.doc h2:target,
.doc h3:target,
.doc h4:target,
.doc h5:target,
.doc details:target {
  -webkit-animation: target-flash 1.6s ease-out;
  animation: target-flash 1.6s ease-out;
}

/* Permalinks added to headings by manual.js */
.doc .anchor {
  margin-left: 0.4rem;
  color: var(--text-muted);
  font-weight: 400;
  text-decoration: none;
  opacity: 0;
  transition: opacity 0.15s, color 0.15s;
}

.doc h2:hover .anchor,
.doc h3:hover .anchor,
.doc h4:hover .anchor,
.doc h5:hover .anchor,
.doc .anchor:focus {
  opacity: 1;
}

.doc .anchor:hover {
  color: var(--link);
}

/* "Details" links of the quick start steps */
.doc a.details {
  display: block;
  width: max-content;
  max-width: 100%;
  margin-top: 0.15rem;
  font-size: 0.875rem;
  font-weight: 500;
}

.doc a.details::before {
  content: "\2192\00a0";
}

/* "Contrasts for this design" links at the end of the model examples */
.doc .xref {
  margin-top: 1.25rem;
  font-size: 0.9375rem;
  font-weight: 500;
}

@-webkit-keyframes target-flash {
  from { background-color: var(--mark); }
  to { background-color: transparent; }
}

@keyframes target-flash {
  from { background-color: var(--mark); }
  to { background-color: transparent; }
}

.doc p,
.doc ul,
.doc ol {
  margin: 0 0 1rem;
}

.doc ul,
.doc ol {
  padding-left: 1.5rem;
}

.doc li {
  margin: 0.35rem 0;
}

.doc li > ul,
.doc li > ol {
  margin: 0.35rem 0 0.5rem;
}

.doc li::marker {
  color: var(--text-muted);
}

.doc b,
.doc strong {
  color: var(--heading);
  font-weight: 650;
}

.subhead {
  color: var(--heading);
  font-weight: 650;
}

.doc sup,
.doc sub {
  position: relative;
  font-size: 0.75em;
  line-height: 0;
  vertical-align: baseline;
}

.doc sup {
  top: -0.5em;
}

.doc sub {
  bottom: -0.25em;
}

.doc hr {
  margin: 2rem 0;
  border: 0;
  border-top: 1px solid var(--border);
}

.doc code,
.doc kbd,
.doc pre {
  font-family: var(--font-mono);
}

.doc code {
  padding: 0.1em 0.35em;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--code-bg);
  font-size: 0.85em;
  word-wrap: break-word;
}

.doc pre {
  overflow-x: auto;
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--code-bg);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* ─── Links ──────────────────────────────────────────────────── */

.doc a {
  text-decoration: underline;
  -webkit-text-decoration-color: var(--link-line);
  text-decoration-color: var(--link-line);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color 0.15s, text-decoration-color 0.15s;
}

.doc a:hover {
  color: var(--link-hover);
  -webkit-text-decoration-color: currentColor;
  text-decoration-color: currentColor;
}

/* Links that run CAT/SPM functions inside MATLAB, marked with a play icon. */
.doc a.function,
.doc .function {
  color: var(--action);
  font-weight: 550;
  text-decoration: none;
}

.doc a.function:hover {
  color: var(--action);
  text-decoration: underline;
}

/* On the help website the MATLAB links are removed (see Makefile), only their text remains. */
.doc a.function:not([href]):hover {
  text-decoration: none;
}

.doc a.function::before,
.doc .function::before {
  display: inline-block;
  width: 0.62em;
  height: 0.62em;
  margin: 0 0.3em 0 0.1em;
  background-color: currentColor;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 10'%3E%3Cpath d='M1.5 0.8 9.2 5 1.5 9.2z'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 10'%3E%3Cpath d='M1.5 0.8 9.2 5 1.5 9.2z'/%3E%3C/svg%3E") center / contain no-repeat;
  content: "";
}

/* ─── Figures and images ─────────────────────────────────────── */

.doc img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  background-color: var(--img-bg);
  vertical-align: middle;
  -webkit-filter: var(--img-filter);
  filter: var(--img-filter);
}

.doc img.border {
  border: 1px solid var(--border-strong);
}

/* Figures with a separate version for the dark theme (img-light / img-dark). */
.doc img.img-dark {
  display: none;
  background-color: transparent;
  -webkit-filter: none;
  filter: none;
}

:root[data-theme="dark"] .doc img.img-light {
  display: none;
}

:root[data-theme="dark"] .doc img.img-dark {
  display: inline;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .doc img.img-light {
    display: none;
  }

  :root:not([data-theme="light"]) .doc img.img-dark {
    display: inline;
  }
}

.doc figure {
  margin: 1.75rem 0 2rem;
  text-align: center;
}

.doc figcaption {
  max-width: 40rem;
  margin: 0.75rem auto 0;
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.55;
}

.doc figcaption b {
  color: var(--text-soft);
}

.doc .figure-row {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: center;
  margin: 1.75rem -0.75rem 2rem;
}

.doc .figure-row figure {
  flex: 1 1 15rem;
  margin: 0 0.75rem 1rem;
}

.doc .image {
  display: block;
  margin: 0;
}

.doc .image img {
  display: block;
  width: 100%;
}

.doc .image.right {
  float: right;
  width: 50%;
  margin: 0.35rem 0 1rem 1.75rem;
}

.doc .image.left {
  float: left;
  width: 28%;
  margin: 0.35rem 1.75rem 1rem 0;
}

/* Notes and tips within the text. */
.doc .note {
  margin: 1rem 0;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--brand);
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  color: var(--text-soft);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.doc li > .note {
  margin: 0.6rem 0 0.4rem;
}

/* ─── Tables ─────────────────────────────────────────────────── */

.doc table {
  width: 100%;
  margin: 1.5rem 0 2rem;
  border-collapse: collapse;
  font-size: 0.9375rem;
  line-height: 1.55;
}

.doc td,
.doc th {
  padding: 0.6rem 0.875rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.doc tr:first-child > td,
.doc tr:first-child > th {
  border-top: 1px solid var(--border);
}

.doc td > p {
  margin: 0 0 0.25rem;
}

.doc td > :last-child {
  margin-bottom: 0;
}

.doc td > ul {
  margin: 0;
  padding-left: 1.1rem;
}

.doc td > ul > li {
  margin: 0;
}

.doc tr.grey {
  background: var(--row-alt);
}

.doc tr[style*="font-weight"] {
  background: var(--bg-soft);
  color: var(--heading);
}

/* ─── Collapsible blocks (FAQ, release notes) ────────────────── */

.doc details {
  margin: 0.5rem 0;
  padding: 0 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.doc details:hover {
  border-color: var(--border-strong);
}

.doc details[open] {
  padding-bottom: 0.9rem;
  border-color: var(--border-strong);
}

.doc summary {
  position: relative;
  display: block;
  margin: 0 -1.1rem;
  padding: 0.75rem 1.1rem 0.75rem 2.6rem;
  border-radius: var(--radius);
  color: var(--heading);
  font-weight: 550;
  line-height: 1.5;
  list-style: none;
  cursor: pointer;
}

.doc summary::-webkit-details-marker {
  display: none;
}

.doc summary::before {
  position: absolute;
  top: 1.15rem;
  left: 1.1rem;
  width: 0.45rem;
  height: 0.45rem;
  border-right: 2px solid var(--text-muted);
  border-bottom: 2px solid var(--text-muted);
  transform: rotate(-45deg);
  transition: transform 0.2s;
  content: "";
}

.doc details[open] > summary {
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
  border-radius: var(--radius) var(--radius) 0 0;
}

.doc details[open] > summary::before {
  transform: rotate(45deg);
}

.doc summary:hover {
  background: var(--bg-soft);
}

.doc summary .subhead {
  font-weight: inherit;
}

/* ─── Buttons (standalone downloads) ─────────────────────────── */

.doc ul.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-gap: 0.5rem;
  margin: 0 0 0.5rem;
  padding: 0;
  list-style: none;
}

.doc ul.actions li {
  margin: 0;
}

.doc .button {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0.55rem 0.9rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--heading);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.35;
  text-decoration: none;
  transition: border-color 0.15s, background-color 0.15s;
}

.doc .button::before {
  flex: none;
  width: 1rem;
  height: 1rem;
  margin-right: 0.6rem;
  background-color: var(--text-muted);
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 3v12m-5-5 5 5 5-5M4 21h16'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 3v12m-5-5 5 5 5-5M4 21h16'/%3E%3C/svg%3E") center / contain no-repeat;
  content: "";
}

.doc ul.actions li:first-child .button {
  border-color: var(--brand);
  background: var(--accent-bg);
}

.doc .button:hover {
  border-color: var(--brand);
  background: var(--accent-bg);
  color: var(--heading);
}

/* ─── Footer and back-to-top ─────────────────────────────────── */

.doc-footer {
  max-width: var(--content-w);
  margin: 5rem auto 0;
  padding: 1.5rem 0 1rem;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.8125rem;
}

.doc-footer p {
  margin: 0;
}

.doc-footer p + p {
  margin-top: 0.4rem;
}

.doc-footer a {
  color: var(--text-soft);
}

.doc-footer a:hover {
  color: var(--link);
}

.back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 20;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--bg);
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(0.5rem);
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

/* ─── Small screens ──────────────────────────────────────────── */

@media (min-width: 1024px) {
  .menu-btn {
    display: none;
  }
}

@media (max-width: 1023.98px) {
  .sidebar {
    position: fixed;
    top: var(--header-h);
    bottom: 0;
    left: 0;
    z-index: 40;
    width: 20rem;
    max-width: 86vw;
    height: auto;
    border-right: 1px solid var(--border);
    box-shadow: var(--shadow);
    visibility: hidden;
    transform: translateX(-100%);
    transition: transform 0.25s ease, visibility 0.25s;
  }

  .nav-open .sidebar {
    visibility: visible;
    transform: none;
  }

  .backdrop {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 35;
    display: block;
    background: var(--backdrop);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s, visibility 0.25s;
  }

  .nav-open .backdrop {
    opacity: 1;
    visibility: visible;
  }

  .content {
    padding: 0 1.5rem 2rem;
  }
}

@media (max-width: 720px) {
  .content {
    padding: 0 1rem 2rem;
  }

  .doc-header {
    padding-top: 2rem;
  }

  .doc h1 {
    font-size: 2rem;
  }

  .doc h2 {
    margin-top: 3.5rem;
    font-size: 1.5rem;
  }

  .doc h3 {
    font-size: 1.2rem;
  }

  .doc .image.right,
  .doc .image.left {
    float: none;
    width: auto;
    margin: 1rem 0;
  }

  .doc .image.left {
    max-width: 12rem;
  }

  .doc table {
    display: block;
    overflow-x: auto;
  }

  .doc ul.actions {
    grid-template-columns: 1fr;
  }

  .search kbd,
  .brand-sub {
    display: none;
  }

  .search-results {
    position: fixed;
    top: calc(var(--header-h) + 0.5rem);
    right: 1rem;
    left: 1rem;
    width: auto;
    max-width: none;
  }
}

@media (max-width: 480px) {
  .topbar {
    padding: 0 0.75rem;
  }

  .github-link {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    -webkit-animation: none !important;
    animation: none !important;
    transition: none !important;
  }
}

/* ─── Print ──────────────────────────────────────────────────── */

@media print {
  .topbar,
  .sidebar,
  .backdrop,
  .back-to-top,
  .skip-link,
  .callout {
    display: none !important;
  }

  .content {
    padding: 0;
  }

  .doc,
  .doc-footer {
    max-width: none;
  }

  .doc h2,
  .doc h3,
  .doc h4 {
    page-break-after: avoid;
  }

  .doc figure,
  .doc img,
  .doc tr {
    page-break-inside: avoid;
  }

  .doc details {
    border: 0;
    padding: 0;
  }

  .doc summary::before {
    display: none;
  }

  .doc img.img-light {
    display: inline !important;
  }

  .doc img.img-dark {
    display: none !important;
  }
}