/* ultra11y documentation site — one stylesheet, no framework, no remote resource.
   Light and dark themes: prefers-color-scheme by default, overridable by the toggle
   (html[data-theme]). The blues are the presentation's: #000091 and its tints (#6a6af4,
   #cacafb, #e3e3fd), on neutral greys. Every text colour pair below is at least 4.5:1 on its
   background, every line or arrow at least 3:1. */

:root {
  color-scheme: light;
  --page: #f6f6f6;
  --surface: #ffffff;
  --text: #161616;
  --text-2: #3a3a3a;
  --muted: #5e5e5e;
  --grid: #dddddd;
  --axis: #8c8c8c;
  --ring: rgba(22, 22, 22, 0.14);
  --link: #000091;
  --focus: #0a76f6;
  /* the four automation levels, strongest first */
  --o1: #000091;
  --o2: #2323b4;
  --o3: #6a6af4;
  --o4: #cacafb;
  --on-o1: #fff;
  --on-o2: #fff;
  --on-o3: #000;
  --on-o4: #000091;
  /* diagrams: lines and arrows, titles, the pale and grey boxes */
  --line: #000091;
  --title: #000091;
  --pale: #e3e3fd;
  --on-pale: #000091;
  --box-grey: #f6f6f6;
  --box-border: #c8c8c8;
  --warn: #e1000f;
  --on-warn: #fff;
  --dim: #eeeeee;
  --code-bg: #eeeeee;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --page: #101010;
    --surface: #1c1c1c;
    --text: #f0f0f0;
    --text-2: #d2d2d2;
    --muted: #ababab;
    --grid: #333333;
    --axis: #7a7a7a;
    --ring: rgba(255, 255, 255, 0.16);
    --link: #b1b1f9;
    --focus: #8585f6;
    --o1: #cacafb;
    --o2: #9898f8;
    --o3: #6a6af4;
    --o4: #2f2f8a;
    --on-o1: #000091;
    --on-o2: #000;
    --on-o3: #000;
    --on-o4: #fff;
    --line: #b1b1f9;
    --title: #cacafb;
    --pale: #23234d;
    --on-pale: #e3e3fd;
    --box-grey: #262626;
    --box-border: #4a4a4a;
    --warn: #ff6f61;
    --on-warn: #000;
    --dim: #2a2a2a;
    --code-bg: #2a2a2a;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --page: #101010;
  --surface: #1c1c1c;
  --text: #f0f0f0;
  --text-2: #d2d2d2;
  --muted: #ababab;
  --grid: #333333;
  --axis: #7a7a7a;
  --ring: rgba(255, 255, 255, 0.16);
  --link: #b1b1f9;
  --focus: #8585f6;
  --o1: #cacafb;
  --o2: #9898f8;
  --o3: #6a6af4;
  --o4: #2f2f8a;
  --on-o1: #000091;
  --on-o2: #000;
  --on-o3: #000;
  --on-o4: #fff;
  --line: #b1b1f9;
  --title: #cacafb;
  --pale: #23234d;
  --on-pale: #e3e3fd;
  --box-grey: #262626;
  --box-border: #4a4a4a;
  --warn: #ff6f61;
  --on-warn: #000;
  --dim: #2a2a2a;
  --code-bg: #2a2a2a;
}

:root {
  /* arrow shapes, drawn as clip-paths on a filled pseudo-element (shaft + head) */
  --ar-r: polygon(0 40%, 62% 40%, 62% 0, 100% 50%, 62% 100%, 62% 60%, 0 60%);
  --ar-l: polygon(100% 40%, 38% 40%, 38% 0, 0 50%, 38% 100%, 38% 60%, 100% 60%);
  --ar-d: polygon(40% 0, 60% 0, 60% 62%, 100% 62%, 50% 100%, 0 62%, 40% 62%);
  --ar-u: polygon(50% 0, 100% 100%, 0 100%);
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--text);
  font: 1rem/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

a {
  color: var(--link);
  text-underline-offset: 0.15em;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip {
  position: absolute;
  left: 0.5rem;
  top: -4rem;
  z-index: 20;
  background: var(--surface);
  color: var(--link);
  padding: 0.5rem 1rem;
  border: 2px solid var(--focus);
  border-radius: 6px;
}

.skip:focus {
  top: 0.5rem;
}

/* ---- header / nav ---- */

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--ring);
}

.site-header .bar {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0.6rem 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.5rem;
}

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  text-decoration: none;
}

.site-header nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-header nav a {
  display: inline-block;
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  color: var(--text-2);
  text-decoration: none;
}

.site-header nav a:hover {
  color: var(--text);
  text-decoration: underline;
}

.site-header nav a[aria-current="page"] {
  color: var(--text);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.35em;
}

.theme-toggle {
  margin-left: auto;
  font: inherit;
  font-size: 0.875rem;
  padding: 0.35rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--axis);
  background: transparent;
  color: var(--text);
  cursor: pointer;
}

/* ---- layout ---- */

main {
  display: block;
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

h1 {
  font-size: clamp(1.7rem, 1.2rem + 2vw, 2.3rem);
  line-height: 1.2;
  margin: 0 0 0.75rem;
  letter-spacing: -0.01em;
  max-width: 30ch;
}

h2 {
  font-size: 1.45rem;
  line-height: 1.3;
  margin: 3rem 0 0.75rem;
}

h3 {
  font-size: 1.15rem;
  margin: 2rem 0 0.5rem;
}

h4 {
  font-size: 1rem;
  margin: 1.25rem 0 0.4rem;
}

p,
li,
dd {
  color: var(--text-2);
  max-width: 72ch;
}

strong,
b {
  color: var(--text);
}

.lede {
  font-size: 1.15rem;
  margin: 0 0 1.75rem;
}

code,
pre {
  font: 0.875rem/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

code {
  background: var(--code-bg);
  color: var(--text);
  padding: 0.05rem 0.3rem;
  border-radius: 4px;
  overflow-wrap: anywhere;
}

pre {
  background: var(--code-bg);
  color: var(--text);
  padding: 0.9rem 1.1rem;
  border-radius: 8px;
  overflow-x: auto;
  border: 1px solid var(--ring);
  max-width: 100%;
}

pre code {
  background: none;
  padding: 0;
  overflow-wrap: normal;
}

.card {
  background: var(--surface);
  border: 1px solid var(--ring);
  border-radius: 12px;
  padding: 1.25rem 1.4rem;
  margin: 1rem 0;
}

.card > :first-child {
  margin-top: 0;
}

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

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

.callout {
  border-left: 4px solid var(--o2);
  background: var(--surface);
  padding: 0.9rem 1.2rem;
  margin: 1.25rem 0;
  border-radius: 0 8px 8px 0;
}

.callout > :first-child {
  margin-top: 0;
}

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

.two {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
  gap: 1rem;
}

.two > .card {
  margin: 0;
}

/* ---- tiles ---- */

.tiles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr));
  gap: 0.75rem;
  margin: 1rem 0;
  padding: 0;
  list-style: none;
}

.tile {
  background: var(--surface);
  border: 1px solid var(--ring);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  max-width: none;
}

.tile .v {
  display: block;
  font-size: 2rem;
  font-weight: 650;
  line-height: 1.1;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.tile .v small {
  font-size: 1rem;
  font-weight: 400;
  color: var(--muted);
}

.tile .l {
  display: block;
  font-size: 0.9rem;
  color: var(--text-2);
  margin-top: 0.3rem;
}

/* ---- process diagram ---- */

.flow {
  list-style: none;
  padding: 0;
  margin: 1rem 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr));
  gap: 0.6rem;
  counter-reset: step;
}

.flow li {
  max-width: none;
  background: var(--surface);
  border: 2px solid var(--o2);
  border-radius: 10px;
  padding: 0.8rem 0.9rem;
  counter-increment: step;
  position: relative;
}

.flow li::before {
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 50%;
  background: var(--o2);
  color: var(--on-o2);
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 0.4rem;
}

.flow li.machine {
  background: var(--o1);
  border-color: var(--o1);
  color: var(--on-o1);
}

.flow li.machine strong,
.flow li.machine span {
  color: var(--on-o1);
}

.flow li.machine::before {
  background: var(--on-o1);
  color: var(--o1);
}

.flow strong {
  display: block;
}

.flow span {
  display: block;
  font-size: 0.9rem;
  color: var(--text-2);
}

/* ---- figures (slide images, drawn on white) ---- */

figure {
  margin: 1.25rem 0;
}

figure img {
  display: block;
  width: 100%;
  height: auto;
  background: #fff;
  border-radius: 10px;
  border: 1px solid var(--ring);
  padding: 0.75rem;
}

figcaption {
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 0.5rem;
  max-width: 72ch;
}

/* ---- tables ---- */

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.95rem;
}

caption {
  text-align: left;
  font-weight: 600;
  color: var(--text);
  padding: 0 0 0.6rem;
}

th,
td {
  text-align: left;
  padding: 0.5rem 0.7rem;
  border-bottom: 1px solid var(--grid);
  vertical-align: top;
}

thead th {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
}

td {
  color: var(--text-2);
}

tbody th {
  color: var(--text);
  font-weight: 600;
}

.scroll {
  overflow-x: auto;
  max-width: 100%;
}

.crit-table th[scope="row"] {
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.crit-table tr:target {
  background: var(--dim);
  outline: 2px solid var(--focus);
}

.crit-table code {
  font-size: 0.75rem;
}

.crit-table td:nth-child(2) {
  min-width: 16rem;
}

.crit-table td:nth-child(5),
.crit-table td:nth-child(6) {
  min-width: 12rem;
}

/* ---- stacked bars ---- */

.stack {
  display: flex;
  gap: 2px;
  height: 2.5rem;
  margin: 0.5rem 0 1rem;
}

.stack > div {
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  min-width: 1.6rem;
  overflow: hidden;
  white-space: nowrap;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
  margin: 0 0 1rem;
  padding: 0;
  list-style: none;
  font-size: 0.9rem;
}

.legend li {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  max-width: none;
}

.legend-col {
  flex-direction: column;
}

.sw {
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 3px;
  flex: none;
  position: relative;
  top: 0.1rem;
  box-shadow: inset 0 0 0 1px var(--ring);
}

.c-det { background: var(--o1); color: var(--on-o1); }
.c-nc { background: var(--o2); color: var(--on-o2); }
.c-hint { background: var(--o3); color: var(--on-o3); }
.c-llm { background: var(--o4); color: var(--on-o4); }

.a-caught { background: var(--o1); color: var(--on-o1); }
.a-missed { background: var(--warn); color: var(--on-warn); }
.a-rendered { background: var(--o3); color: var(--on-o3); }
.a-judgment { background: var(--o4); color: var(--on-o4); }
.a-other { background: var(--dim); color: var(--text); box-shadow: inset 0 0 0 1px var(--axis); }

.t-static { background: var(--o1); color: var(--on-o1); }
.t-rendered { background: var(--o3); color: var(--on-o3); }
.t-judgment { background: var(--o4); color: var(--on-o4); }

/* ---- criteria grid ---- */

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0 0 1rem;
  align-items: center;
}

.filters[hidden] {
  display: none;
}

.filters .flabel {
  font-size: 0.9rem;
  color: var(--muted);
  margin-right: 0.25rem;
}

.filters button {
  font: inherit;
  font-size: 0.875rem;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--axis);
  background: transparent;
  color: var(--text);
  cursor: pointer;
}

.filters button[aria-pressed="true"] {
  background: var(--text);
  color: var(--surface);
  border-color: var(--text);
}

.mrow {
  display: grid;
  grid-template-columns: 15rem 1fr;
  align-items: center;
  gap: 0.75rem;
  padding: 0.2rem 0;
}

.mrow .th {
  margin: 0;
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--text-2);
  text-align: right;
}

.cells {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.cells li {
  max-width: none;
}

.cell {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 3.25rem;
  padding: 0 0.25rem;
  height: 1.75rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  text-decoration: none;
  transition: opacity 0.12s;
}

.cell:hover {
  text-decoration: underline;
}

.cell.hit {
  box-shadow: 0 0 0 2px var(--page), 0 0 0 4px var(--text);
}

/* ---- per-source bars ---- */

.bars th small {
  display: block;
  font-weight: 400;
  color: var(--muted);
  font-size: 0.8rem;
}

.bars .num {
  text-align: right;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.bars .barcell {
  width: 40%;
  vertical-align: middle;
}

.track {
  display: flex;
  gap: 2px;
  height: 1.25rem;
}

.track > div {
  height: 100%;
  border-radius: 3px;
}

.seg-nc { background: var(--o2); }
.seg-hint { background: var(--o4); box-shadow: inset 0 0 0 1px var(--axis); }

/* ---- footer ---- */

.site-footer {
  border-top: 1px solid var(--ring);
  background: var(--surface);
  padding: 1.5rem;
  font-size: 0.875rem;
}

.site-footer p {
  max-width: 1100px;
  margin: 0.3rem auto;
  color: var(--muted);
}

/* ---- small screens ---- */

@media (max-width: 760px) {
  .mrow {
    grid-template-columns: 1fr;
    gap: 0.3rem;
    padding: 0.4rem 0;
  }

  .mrow .th {
    text-align: left;
  }

  .bars .barcell {
    display: none;
  }

  .bars th,
  .bars td {
    padding: 0.45rem 0.35rem;
  }

  .bars .num {
    white-space: normal;
  }

  .theme-toggle {
    margin-left: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}

@media print {
  .site-header nav,
  .theme-toggle,
  .filters {
    display: none;
  }
}

.two.pairs {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr));
}

.flow .tag {
  display: inline-block;
  font-style: normal;
  font-size: 0.75rem;
  font-weight: 600;
  margin: 0 0 0.3rem 0.4rem;
  padding: 0.05rem 0.45rem;
  border-radius: 999px;
  border: 1px solid currentColor;
}

.flow li.machine code {
  background: transparent;
  color: var(--on-o1);
}

/* The level of a criterion is never given by colour alone: each cell carries a shape,
   repeated in the legend. The shape is decorative for assistive technologies (the level is
   in the cell's text), hence the empty alternative after the slash. */
.cell::after,
.mark::before {
  margin-left: 0.15rem;
  font-size: 0.7rem;
}

.cell[data-level="det"]::after,
.mark-det::before {
  content: "★" / "";
}

.cell[data-level="nc"]::after,
.mark-nc::before {
  content: "▲" / "";
}

.cell[data-level="hint"]::after,
.mark-hint::before {
  content: "◆" / "";
}

.mark::before {
  margin: 0 0.3rem 0 0;
}

.quote blockquote {
  margin: 0;
}

.quote blockquote p {
  font-size: 1.05rem;
  color: var(--text);
}

.quote blockquote p::before {
  content: "«\00a0";
}

.quote blockquote p::after {
  content: "\00a0»";
}

/* The lightest fill sits below 3:1 against the card: outline it so the shape stays visible. */
.c-llm,
.a-judgment,
.t-judgment {
  box-shadow: inset 0 0 0 1px var(--axis);
}

.stack-lg {
  height: 4rem;
}

.stack-lg > div {
  font-size: 1.1rem;
}

/* =======================================================================================
   Diagrams — the presentation's schemas, rebuilt in HTML and CSS. Every label is real
   text; only lines and arrows are drawn. Wide screens get the slide layout, narrow screens
   the same boxes stacked top to bottom, with the arrows turned downwards.
   ======================================================================================= */

.dia {
  background: var(--surface);
  border: 1px solid var(--ring);
  border-radius: 12px;
  padding: 1.5rem;
  margin: 1.25rem 0 1.5rem;
}

.dia figcaption {
  margin-top: 1.25rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.dia p,
.dia li {
  max-width: none;
}

/* ---- boxes ---- */

.bx {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.2rem;
  min-height: 6.5rem;
  margin: 0;
  padding: 0.85rem 0.75rem;
  text-align: center;
  background: var(--surface);
  border: 2px solid var(--box-border);
  color: var(--text);
}

.bx strong {
  display: block;
  font-size: 1.05rem;
  line-height: 1.3;
  color: var(--text);
}

.bx span {
  display: block;
  font-size: 0.875rem;
  line-height: 1.4;
  color: var(--text-2);
}

.bx code {
  background: none;
  padding: 0;
  color: inherit;
}

.bx-fill {
  background: var(--o1);
  border-color: var(--o1);
}

.bx-fill strong,
.bx-fill span,
.bx-fill code {
  color: var(--on-o1);
}

.bx-line {
  border-color: var(--line);
}

.bx-line strong {
  color: var(--title);
}

.bx-pale {
  background: var(--pale);
  border-color: var(--line);
}

.bx-pale strong {
  color: var(--on-pale);
}

.bx-pale span {
  color: var(--text);
}

.bx-grey {
  background: var(--box-grey);
  border-width: 1px;
}

.bx-plain {
  border-width: 1px;
}

/* ---- arrows (pseudo-elements; decorative, the order is in the markup) ---- */

.ar-r::after,
.ar-l::after,
.ar-d::after {
  content: "";
  position: absolute;
  background: var(--line);
}

/* ---- bands above a group of steps ---- */

.band {
  margin: 0;
  text-align: center;
  font-weight: 700;
  color: var(--title);
  padding-bottom: 0.55rem;
  border-bottom: 3px solid var(--line);
}

.band-dashed {
  border-bottom-style: dashed;
}

/* ---------------------------------------------------------------------------------------
   Process (slide 3)
   --------------------------------------------------------------------------------------- */

.proc {
  --gap: 2rem;
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  column-gap: var(--gap);
  row-gap: 0.9rem;
}

.proc-b1 {
  grid-column: 2 / 4;
  grid-row: 1;
}

.proc-b2 {
  grid-column: 4 / 6;
  grid-row: 1;
}

.proc-steps {
  grid-column: 1 / -1;
  grid-row: 2;
  display: grid;
  grid-template-columns: subgrid;
  list-style: none;
  margin: 0;
  padding: 0;
}

.proc-steps > li:not(:last-child)::after {
  content: "";
  position: absolute;
  background: var(--line);
  top: 50%;
  left: calc(100% + 4px);
  width: calc(var(--gap) - 8px);
  height: 16px;
  transform: translateY(-50%);
  clip-path: var(--ar-r);
}

.proc-loop {
  grid-column: 4 / 6;
  grid-row: 3;
  margin: 0;
  text-align: center;
  color: var(--title);
}

.proc-loop .loop-line {
  display: block;
  position: relative;
  height: 2.6rem;
  margin: -0.9rem calc((100% - var(--gap)) / 4) 0.55rem;
  border: 2px dashed var(--line);
  border-top: 0;
  border-radius: 0 0 50% 50% / 0 0 100% 100%;
}

.proc-loop .loop-line::before {
  content: "";
  position: absolute;
  left: -9px;
  top: 0;
  width: 16px;
  height: 14px;
  background: var(--line);
  clip-path: var(--ar-u);
}

.proc figcaption {
  grid-column: 1 / -1;
  grid-row: 4;
}

/* ---------------------------------------------------------------------------------------
   Workflow timeline (slide 4)
   --------------------------------------------------------------------------------------- */

.tl {
  --gap: 1.5rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  column-gap: var(--gap);
  row-gap: 1.75rem;
}

.tl-band {
  margin: 0;
  padding: 0.85rem 1rem;
  text-align: center;
  font-weight: 700;
}

.tl-band code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: 1em;
}

.tl-b1 {
  grid-column: 1 / 4;
  grid-row: 1;
  background: var(--pale);
  color: var(--on-pale);
  border-block: 1px solid var(--line);
}

.tl-b2 {
  grid-column: 4;
  grid-row: 1;
  background: var(--o1);
  color: var(--on-o1);
  border-block: 1px solid var(--o1);
}

.tl-steps {
  grid-column: 1 / -1;
  grid-row: 2;
  display: grid;
  grid-template-columns: subgrid;
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: tl;
}

.tl-steps li {
  position: relative;
  counter-increment: tl;
  text-align: center;
}

.tl-steps li::before {
  content: counter(tl) / "";
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  margin: 0 auto 0.9rem;
  border-radius: 50%;
  background: var(--o1);
  color: var(--on-o1);
  font-weight: 700;
  font-size: 1.15rem;
}

.tl-steps li:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 1.5rem;
  left: 50%;
  width: calc(100% + var(--gap));
  height: 3px;
  transform: translateY(-50%);
  background: var(--line);
}

.tl-steps strong {
  display: block;
  font-size: 1.1rem;
  line-height: 1.3;
}

.tl-steps strong code {
  font-size: 0.95em;
}

.tl-steps span {
  display: block;
  font-size: 0.9rem;
  color: var(--text-2);
  margin-top: 0.3rem;
}

.tl-note {
  grid-column: 1 / -1;
  grid-row: 3;
  margin: 0;
  text-align: center;
  color: var(--muted);
}

.tl figcaption {
  grid-column: 1 / -1;
  grid-row: 4;
}

/* ---------------------------------------------------------------------------------------
   The two skills (slide 5)
   --------------------------------------------------------------------------------------- */

.skills {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

.skill {
  background: var(--surface);
  border: 1px solid var(--ring);
  border-radius: 12px;
  overflow: hidden;
}

.skill h3 {
  margin: 0;
  padding: 1rem 1.25rem;
  font-size: 1.2rem;
}

.skill h3 code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: 1.05em;
}

.skill h3 span {
  display: block;
  font-size: 0.95rem;
  font-weight: 500;
}

.skill-review h3 {
  background: var(--pale);
  color: var(--on-pale);
  border-bottom: 1px solid var(--line);
}

.skill-audit h3 {
  background: var(--o1);
  color: var(--on-o1);
}

.skill dl {
  margin: 0;
  padding: 0.25rem 1.25rem 1.1rem;
}

.skill dt {
  margin-top: 0.85rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.skill dd {
  margin: 0.15rem 0 0;
  color: var(--text);
}

/* ---------------------------------------------------------------------------------------
   The audit loop (slide 6)
   --------------------------------------------------------------------------------------- */

.lp {
  --gap: 2.5rem;
  --rgap: 3rem;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  column-gap: var(--gap);
  row-gap: var(--rgap);
}

.lp-steps,
.lp-out {
  grid-column: 1 / -1;
  grid-row: 1 / 3;
  display: grid;
  grid-template-columns: subgrid;
  grid-template-rows: subgrid;
  list-style: none;
  margin: 0;
  padding: 0;
}

.lp-steps > li:nth-child(1) { grid-area: 1 / 1; }
.lp-steps > li:nth-child(2) { grid-area: 1 / 2; }
.lp-steps > li:nth-child(3) { grid-area: 1 / 3; }
.lp-steps > li:nth-child(4) { grid-area: 2 / 3; }
.lp-steps > li:nth-child(5) { grid-area: 2 / 2; }
.lp-out > li:nth-child(1) { grid-area: 1 / 4; }
.lp-out > li:nth-child(2) { grid-area: 1 / 5; }

.lp-steps > li:nth-child(1)::after,
.lp-steps > li:nth-child(2)::after,
.lp-out > li:nth-child(1)::after {
  content: "";
  position: absolute;
  background: var(--line);
  top: 50%;
  left: calc(100% + 4px);
  width: calc(var(--gap) - 8px);
  height: 16px;
  transform: translateY(-50%);
  clip-path: var(--ar-r);
}

.lp-steps > li:nth-child(3)::after {
  content: "";
  position: absolute;
  background: var(--line);
  left: 50%;
  top: calc(100% + 4px);
  width: 16px;
  height: calc(var(--rgap) - 8px);
  transform: translateX(-50%);
  clip-path: var(--ar-d);
}

.lp-steps > li:nth-child(4)::after {
  content: "";
  position: absolute;
  background: var(--line);
  top: 50%;
  right: calc(100% + 4px);
  width: calc(var(--gap) - 8px);
  height: 16px;
  transform: translateY(-50%);
  clip-path: var(--ar-l);
}

.lp-back,
.lp-exit {
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  margin: 0;
  padding-bottom: 0.25rem;
  text-align: center;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--title);
}

.lp-back {
  grid-area: 2 / 1;
}

.lp-exit {
  grid-area: 2 / 4;
}

/* « ré-audit »: dashed, from the correction box back up to the audit box */
.lp-back::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  right: calc(-1 * var(--gap));
  border-top: 2px dashed var(--line);
}

.lp-back::after {
  content: "";
  position: absolute;
  left: 50%;
  top: calc(-1 * var(--rgap) + 12px);
  bottom: 50%;
  border-left: 2px dashed var(--line);
}

/* « tout est prouvé »: solid, from the counter-check box up into the deliverables */
.lp-exit::before {
  content: "";
  position: absolute;
  top: 50%;
  left: calc(-1 * var(--gap));
  right: 50%;
  border-top: 2px solid var(--line);
}

.lp-exit::after {
  content: "";
  position: absolute;
  left: 50%;
  top: calc(-1 * var(--rgap) + 12px);
  bottom: 50%;
  border-left: 2px solid var(--line);
}

.lp-head {
  position: absolute;
  left: calc(50% - 7px);
  top: calc(-1 * var(--rgap) + 2px);
  width: 16px;
  height: 14px;
  background: var(--line);
  clip-path: var(--ar-u);
}

.lp-label {
  display: block;
  padding: 0 0.25rem;
  background: var(--surface);
  position: relative;
}

.lp figcaption {
  grid-column: 1 / -1;
  grid-row: 3;
}

/* ---------------------------------------------------------------------------------------
   Judge, then be contradicted (slide 7)
   --------------------------------------------------------------------------------------- */

.trial {
  --gap: 3rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: var(--gap);
  row-gap: 1rem;
}

.tr-col h3 {
  margin: 0 0 0.75rem;
  font-size: 1.2rem;
  color: var(--title);
}

.tr-head {
  min-height: 5.5rem;
}

.tr-mid {
  width: min(100%, 15rem);
  margin: 1.75rem auto 0;
  min-height: 5rem;
}

/* head → middle box */
.tr-col:first-child .tr-head::after {
  content: "";
  position: absolute;
  background: var(--line);
  left: 50%;
  top: calc(100% + 3px);
  width: 16px;
  height: calc(1.75rem - 6px);
  transform: translateX(-50%);
  clip-path: var(--ar-d);
}

/* the stem from the parent box down to the fork */
.tr-mid::after,
.tr-col + .tr-col .tr-head::after {
  content: "";
  position: absolute;
  left: 50%;
  top: calc(100% + 2px);
  width: 2px;
  height: calc(1rem - 2px);
  transform: translateX(-50%);
  background: var(--line);
}

/* arbitrage → counter-check */
.tr-col + .tr-col .tr-head::before {
  content: "";
  position: absolute;
  background: var(--line);
  top: 50%;
  right: calc(100% + 4px);
  width: calc(var(--gap) - 8px);
  height: 16px;
  transform: translateY(-50%);
  clip-path: var(--ar-r);
}

.tr-kids {
  --kgap: 0.6rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--kgap);
  list-style: none;
  margin: 2.25rem 0 0;
  padding: 0;
}

.tr-kids > li {
  min-height: 5.5rem;
  padding: 0.7rem 0.4rem;
}

.tr-kids > li strong {
  font-size: 0.98rem;
}

.tr-kids > li span {
  font-size: 0.82rem;
}

/* the fork: a bar across the children, an arrow down into each */
.tr-kids > li::before {
  content: "";
  position: absolute;
  top: calc(-1.25rem - 2px);
  left: calc(-1 * var(--kgap) / 2 - 2px);
  right: calc(-1 * var(--kgap) / 2 - 2px);
  border-top: 2px solid var(--line);
}

.tr-kids > li:first-child::before {
  left: 50%;
}

.tr-kids > li:last-child::before {
  right: 50%;
}

.tr-kids > li::after {
  content: "";
  position: absolute;
  background: var(--line);
  top: calc(-1.25rem - 2px);
  left: 50%;
  width: 16px;
  height: calc(1.25rem - 2px);
  transform: translateX(-50%);
  clip-path: var(--ar-d);
}

.trial figcaption {
  grid-column: 1 / -1;
}

/* ---------------------------------------------------------------------------------------
   Coverage waffle (slide 8)
   --------------------------------------------------------------------------------------- */

.waffle {
  display: grid;
  grid-template-columns: repeat(14, minmax(0, 1fr));
  gap: 5px;
  max-width: 36rem;
  margin: 0.5rem 0 1.25rem;
}

.sq {
  aspect-ratio: 1;
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  line-height: 1;
}

.sq.c-det::after {
  content: "★" / "";
}

.sq.c-nc::after {
  content: "▲" / "";
}

.sq.c-hint::after {
  content: "◆" / "";
}

/* ---------------------------------------------------------------------------------------
   W3C ACT score (slide 9): the slide's dark-blue panel, in both themes
   --------------------------------------------------------------------------------------- */

.act-score {
  background: #000091;
  border: 1px solid #6a6af4;
  border-radius: 12px;
  padding: 1.5rem 1.5rem 0.25rem;
  margin: 1rem 0 1.5rem;
}

.act-score p,
.act-score strong {
  color: #fff;
  max-width: none;
  margin: 0;
}

.act-score .as-h {
  margin-bottom: 0.5rem;
}

.act-score .as-h strong {
  font-size: 1.3rem;
}

.as-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 16rem;
  column-gap: 1.25rem;
  align-items: center;
  margin: 0 0 1.5rem;
}

.as-track {
  grid-area: 1 / 1;
  height: 3.25rem;
  background: #6a6af4;
  border-radius: 4px;
  overflow: hidden;
}

.as-fill {
  height: 100%;
  background: #fff;
}

.act-score .as-in {
  grid-area: 1 / 1;
  padding-left: 1rem;
}

.act-score .as-in strong {
  color: #000091;
  font-size: 1.1rem;
}

.act-score .as-side {
  grid-area: 1 / 2;
  color: #cacafb;
  font-size: 0.95rem;
}

.act-score code {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
}

/* ---------------------------------------------------------------------------------------
   Home hero (slide 1)
   --------------------------------------------------------------------------------------- */

.hero {
  background: #000091;
  border-radius: 16px;
  padding: clamp(1.5rem, 1rem + 3vw, 3rem);
  margin: 0 0 2rem;
}

.hero .kicker {
  margin: 0 0 0.75rem;
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
  color: #cacafb;
}

.hero h1 {
  color: #fff;
  max-width: 24ch;
}

.hero p,
.hero strong {
  color: #fff;
}

.hero .lede {
  max-width: 62ch;
}

.hero abbr {
  text-decoration-color: #cacafb;
}

.hero a {
  color: #fff;
}

.hero :focus-visible {
  outline-color: #fff;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.5rem;
  margin: 1.5rem 0 0;
}

.hero a.cta {
  display: inline-block;
  padding: 0.8rem 1.3rem;
  border-radius: 8px;
  background: #fff;
  color: #000091;
  font-weight: 700;
  text-decoration: none;
}

.hero a.cta:hover {
  text-decoration: underline;
}

/* ---------------------------------------------------------------------------------------
   Installation page: numbered steps, OS panels, expected output, copy buttons
   --------------------------------------------------------------------------------------- */

.steps {
  list-style: none;
  margin: 1rem 0 1.5rem;
  padding: 0;
  counter-reset: st;
}

.steps > li {
  position: relative;
  counter-increment: st;
  padding: 0.1rem 0 0 3.1rem;
  margin: 0 0 1.1rem;
  max-width: 72ch;
}

.steps > li::before {
  content: counter(st) / "";
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 50%;
  background: var(--o1);
  color: var(--on-o1);
  font-weight: 700;
}

.steps > li > p {
  margin: 0.2rem 0 0.5rem;
}

.os {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr));
  gap: 1rem;
}

.os > section {
  background: var(--surface);
  border: 1px solid var(--ring);
  border-radius: 12px;
  padding: 1.1rem 1.25rem 0.25rem;
}

.os > section > h3 {
  margin-top: 0;
}

kbd {
  font: 600 0.85rem/1.3 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  padding: 0.05rem 0.4rem;
  border: 1px solid var(--axis);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--surface);
  color: var(--text);
  white-space: nowrap;
}

.expect {
  font-size: 0.95rem;
}

pre.out {
  background: var(--surface);
  border-style: dashed;
}

pre.out samp {
  font: inherit;
}

.codebox {
  position: relative;
}

.codebox > pre {
  padding-right: 6.5rem;
}

.copy {
  position: absolute;
  top: 0.45rem;
  right: 0.45rem;
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--title);
  cursor: pointer;
}

.copy:hover {
  background: var(--pale);
}

.trouble dt {
  font-weight: 700;
  color: var(--text);
  margin-top: 1.25rem;
}

.trouble dd {
  margin: 0.35rem 0 0;
}

/* ---------------------------------------------------------------------------------------
   Narrow screens: every diagram stacks top to bottom
   --------------------------------------------------------------------------------------- */

@media (max-width: 880px) {
  .proc {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 1.6rem;
  }

  .proc-steps {
    grid-column: 1;
    grid-row: 1 / 10;
    grid-template-rows: subgrid;
  }

  .proc-steps > li { grid-column: 1; }
  .proc-steps > li:nth-child(1) { grid-row: 1; }
  .proc-steps > li:nth-child(2) { grid-row: 3; }
  .proc-steps > li:nth-child(3) { grid-row: 4; }
  .proc-steps > li:nth-child(4) { grid-row: 6; }
  .proc-steps > li:nth-child(5) { grid-row: 7; }
  .proc-steps > li:nth-child(6) { grid-row: 9; }

  .proc-b1,
  .proc-b2 {
    grid-column: 1;
    text-align: left;
  }

  .proc-b1 { grid-row: 2; }
  .proc-b2 { grid-row: 5; }

  .proc .bx {
    min-height: 0;
  }

  .proc-steps > li:not(:last-child)::after {
    left: 50%;
    top: calc(100% + 4px);
    width: 16px;
    height: calc(1.6rem - 8px);
    transform: translateX(-50%);
    clip-path: var(--ar-d);
  }

  .proc-loop {
    grid-column: 1;
    grid-row: 8;
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-align: left;
    padding: 0.6rem 0.8rem;
    border: 2px dashed var(--line);
    border-radius: 8px;
  }

  .proc-loop .loop-line {
    flex: none;
    width: 16px;
    height: 1.4rem;
    margin: 0;
    border: 0;
    border-radius: 0;
    background: var(--line);
    clip-path: polygon(50% 0, 100% 45%, 62% 45%, 62% 100%, 38% 100%, 38% 45%, 0 45%);
  }

  .proc-loop .loop-line::before {
    content: none;
  }

  .proc-loop::after {
    content: "";
    position: absolute;
    background: var(--line);
    left: 50%;
    top: calc(100% + 4px);
    width: 16px;
    height: calc(1.6rem - 8px);
    transform: translateX(-50%);
    clip-path: var(--ar-d);
  }

  .proc figcaption {
    grid-column: 1;
    grid-row: 10;
  }

  /* timeline */
  .tl {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 1.25rem;
  }

  .tl-b1 { grid-column: 1; grid-row: 1; }
  .tl-b2 { grid-column: 1; grid-row: 5; }

  .tl-steps {
    grid-column: 1;
    grid-row: 2 / 7;
    grid-template-rows: subgrid;
  }

  .tl-steps > li { grid-column: 1; }
  .tl-steps > li:nth-child(1) { grid-row: 1; }
  .tl-steps > li:nth-child(2) { grid-row: 2; }
  .tl-steps > li:nth-child(3) { grid-row: 3; }
  .tl-steps > li:nth-child(4) { grid-row: 5; }

  .tl-steps li {
    text-align: left;
    min-height: 3rem;
    padding-left: 4rem;
  }

  .tl-steps li::before {
    position: absolute;
    left: 0;
    top: 0;
    margin: 0;
  }

  .tl-steps li:not(:last-child)::after {
    top: 3rem;
    left: 1.5rem;
    width: 3px;
    height: calc(100% - 3rem + 1.25rem);
    transform: translateX(-50%);
  }

  .tl-steps li:nth-child(3)::after {
    content: none;
  }

  .tl-band {
    text-align: left;
  }

  .tl-note { grid-row: 7; text-align: left; }
  .tl figcaption { grid-column: 1; grid-row: 8; }

  /* audit loop */
  .lp {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 1.6rem;
  }

  .lp-steps,
  .lp-out {
    grid-column: 1;
    grid-row: 1 / 10;
  }

  .lp-steps > li:nth-child(1) { grid-area: 1 / 1; }
  .lp-steps > li:nth-child(2) { grid-area: 2 / 1; }
  .lp-steps > li:nth-child(3) { grid-area: 3 / 1; }
  .lp-steps > li:nth-child(4) { grid-area: 4 / 1; }
  .lp-steps > li:nth-child(5) { grid-area: 5 / 1; }
  .lp-out > li:nth-child(1) { grid-area: 8 / 1; }
  .lp-out > li:nth-child(2) { grid-area: 9 / 1; }

  .lp .bx {
    min-height: 0;
  }

  .lp-steps > li:nth-child(1)::after,
  .lp-steps > li:nth-child(2)::after,
  .lp-steps > li:nth-child(3)::after,
  .lp-steps > li:nth-child(4)::after,
  .lp-steps > li:nth-child(5)::after,
  .lp-out > li:nth-child(1)::after {
    content: "";
    position: absolute;
    background: var(--line);
    left: 50%;
    right: auto;
    top: calc(100% + 4px);
    width: 16px;
    height: calc(1.6rem - 8px);
    transform: translateX(-50%);
    clip-path: var(--ar-d);
  }

  .lp-back,
  .lp-exit {
    justify-content: flex-start;
    padding: 0.6rem 0.8rem;
    text-align: left;
  }

  .lp-back {
    grid-area: 6 / 1;
    border: 2px dashed var(--line);
    border-radius: 8px;
  }

  .lp-exit {
    grid-area: 7 / 1;
    padding: 0;
  }

  .lp-back::before,
  .lp-back::after,
  .lp-exit::before,
  .lp-head {
    display: none;
  }

  .lp-exit::after {
    content: "";
    left: 50%;
    top: calc(100% + 4px);
    bottom: auto;
    width: 16px;
    height: calc(1.6rem - 8px);
    border: 0;
    transform: translateX(-50%);
    background: var(--line);
    clip-path: var(--ar-d);
  }

  .lp figcaption {
    grid-column: 1;
    grid-row: 10;
  }

  /* judge, then be contradicted */
  .trial {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 2.75rem;
  }

  .tr-kids {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 2rem;
    position: relative;
  }

  .tr-kids > li::before,
  .tr-kids > li::after,
  .tr-mid::after,
  .tr-col + .tr-col .tr-head::after {
    content: none;
  }

  .tr-kids::before {
    content: "";
    position: absolute;
    background: var(--line);
    left: 50%;
    top: calc(-2rem + 3px);
    width: 16px;
    height: calc(2rem - 6px);
    transform: translateX(-50%);
    clip-path: var(--ar-d);
  }

  .tr-col + .tr-col .tr-head::before {
    content: none;
  }

  .tr-col + .tr-col {
    position: relative;
  }

  .tr-col + .tr-col::before {
    content: "";
    position: absolute;
    background: var(--line);
    left: 50%;
    top: calc(-2.75rem + 3px);
    width: 16px;
    height: calc(2.75rem - 6px);
    transform: translateX(-50%);
    clip-path: var(--ar-d);
  }

  /* ACT panel */
  .as-row {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 0.5rem;
  }

  .act-score .as-side {
    grid-area: 2 / 1;
  }
}

@media print {
  .copy {
    display: none;
  }
}

/* ---- in-page table of contents ---- */

.toc .toc-title {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.toc ol {
  margin: 0;
  padding-left: 1.4rem;
  columns: 2 16rem;
  column-gap: 2rem;
}

.toc li {
  margin: 0.15rem 0;
}

/* With the copy button on, a long command wraps instead of scrolling under the button. */
.codebox > pre {
  white-space: pre-wrap;
}

.codebox > pre code {
  overflow-wrap: anywhere;
}

@media (max-width: 600px) {
  .codebox {
    display: flex;
    flex-direction: column-reverse;
  }

  .codebox > pre {
    padding-right: 1.1rem;
    margin-top: 0.35rem;
  }

  .copy {
    position: static;
    align-self: flex-end;
  }

  .steps > li {
    padding-left: 2.6rem;
  }

  .os > section {
    padding: 1rem 0.9rem 0.25rem;
  }
}

.codebox .nw {
  white-space: nowrap;
}

.copy-msg {
  position: absolute;
  top: 0.75rem;
  right: 5.6rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--title);
}

.copy-msg:empty {
  display: none;
}

@media (max-width: 600px) {
  .copy-msg {
    position: static;
    order: 2;
    align-self: flex-end;
  }
}