/*
 * Design inspired by Rossini Caviar (https://rossinicaviar.com/): an ivory page,
 * warm stone panels, near-black ink, gold reserved for hairlines and rims,
 * high-contrast Bodoni Moda headings, and small tracked Montserrat labels.
 */
@import url("https://fonts.googleapis.com/css2?family=Bodoni+Moda:ital,opsz,wght@0,6..96,400..700;1,6..96,400..700&family=Montserrat:wght@300;400;500;600&display=swap");

:root {
  --deck-ivory: #fdfaf3;
  --deck-stone: #e9e5db;
  --deck-ink: #141414;
  --deck-gold: #dac284;
  /* Gold dark enough for text on ivory and stone (WCAG AA). */
  --deck-gold-deep: #7d6020;
  --deck-muted: #5c574d;
  --deck-display: "Bodoni Moda", "Didot", "Bodoni 72", Georgia, serif;
  --deck-sans: "Montserrat", "Helvetica Neue", Arial, sans-serif;
  --deck-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --r-background-color: var(--deck-ivory);
  --r-main-color: var(--deck-ink);
  --r-heading-color: var(--deck-ink);
  --r-link-color: var(--deck-ink);
  --r-link-color-hover: var(--deck-gold-deep);
  --r-selection-background-color: var(--deck-gold);
  --r-selection-color: var(--deck-ink);
  --r-main-font: var(--deck-sans);
  --r-heading-font: var(--deck-display);
  --r-code-font: var(--deck-mono);
}

/* ---------- Canvas and typography ---------- */

.reveal-viewport {
  background: var(--deck-ivory);
}

.reveal {
  color: var(--deck-ink);
  font-family: var(--deck-sans);
  font-weight: 400;
}

.reveal h1,
.reveal h2 {
  font-family: var(--deck-display);
  font-variation-settings: "opsz" 28;
  font-weight: 500;
  color: var(--deck-ink);
  letter-spacing: -0.01em;
  line-height: 1.1;
  text-transform: none;
  text-wrap: balance;
}

.reveal h2 {
  font-size: 1.45em;
  margin-bottom: 0.35em;
}

.reveal .slides section.smaller h2 {
  font-size: 1.45em;
}

.reveal a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--deck-gold-deep);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

.reveal strong {
  font-weight: 600;
}

.reveal em {
  font-family: var(--deck-display);
  font-variation-settings: "opsz" 28;
  font-size: 1.08em;
}

.reveal .lede {
  display: block;
  font-size: 0.62em;
  font-weight: 300;
  line-height: 1.5;
  color: var(--deck-muted);
  margin-bottom: 0.9em;
}

.reveal .slides section.smaller .lede {
  font-size: 0.9em;
  margin-bottom: 0.6em;
}

.reveal .source {
  position: absolute;
  bottom: -0.6em;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 0.42em;
  color: var(--deck-muted);
}

.reveal .slides section.smaller .source {
  font-size: 0.6em;
}

/* ---------- Title slide: a centred wordmark ---------- */

.reveal .hero {
  text-align: center;
  margin-top: 1.4em;
}

.reveal .hero p {
  margin: 0;
}

.reveal .hero-kicker {
  display: inline-block;
  font-size: 0.42em;
  font-weight: 500;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  margin-bottom: 1em;
}

.reveal .hero-title,
.reveal .hero-title-italic {
  display: block;
  font-family: var(--deck-display);
  font-variation-settings: "opsz" 28;
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.01em;
}

.reveal .hero-title {
  font-size: 2.9em;
}

.reveal .hero-title-italic {
  font-size: 1.9em;
  font-style: italic;
  margin-top: 0.05em;
}

.reveal .hero-subtitle {
  display: inline-block;
  font-size: 0.48em;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-top: 1.4em;
  padding-top: 1em;
  border-top: 1px solid var(--deck-gold);
}

.reveal .hero-source {
  text-align: center;
  font-size: 0.38em;
  color: var(--deck-muted);
  margin-top: 3.5em;
}

/* ---------- Section slides ---------- */

.reveal .slides section.level1 {
  text-align: center;
}

.reveal .slides section.level1 h1 {
  font-size: 2.4em;
  font-style: italic;
  text-transform: lowercase;
}

.reveal .slides section.level1 > p {
  font-size: 0.6em;
  font-weight: 300;
  color: var(--deck-muted);
}

/* ---------- Rule slides ---------- */

.reveal .rule-tag {
  font-family: var(--deck-display);
  font-style: italic;
  font-size: 0.8em;
  color: var(--deck-gold-deep);
  margin-right: 0.35em;
  padding-right: 0.45em;
  border-right: 1px solid var(--deck-gold);
}

.reveal .slides section.rule-slide {
  text-align: center;
}

.reveal .slides section.rule-slide h2 {
  font-size: 1.3em;
}

.reveal .slides section.rule-slide .lede {
  font-size: 0.56em;
  margin-bottom: 0.6em;
}

.reveal img.illustration {
  background: var(--deck-ivory);
  border: 1px solid var(--deck-gold);
  padding: 6px;
  margin: 0.2em auto 0;
}

/* ---------- Cards ---------- */

.reveal .card {
  padding: 0.85em 1.05em;
  font-size: 0.6em;
  line-height: 1.5;
  text-align: left;
}

.reveal .slides section.smaller .card {
  font-size: 0.92em;
}

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

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

.reveal .card p,
.reveal .card ul {
  margin: 0.35em 0;
}

.reveal .card ul {
  padding-left: 1.1em;
  margin-left: 0;
  display: block;
}

.reveal .card li {
  margin: 0.2em 0;
}

.reveal .card li::marker {
  color: var(--deck-gold-deep);
}

.reveal .card-title {
  display: block;
  font-family: var(--deck-display);
  font-variation-settings: "opsz" 28;
  font-style: italic;
  font-weight: 500;
  font-size: 1.6em;
  line-height: 1.15;
  margin: 0.15em 0 0.35em;
}

.reveal .card-stone {
  background: var(--deck-stone);
}

.reveal .card-ink {
  background: var(--deck-ink);
  color: var(--deck-ivory);
}

.reveal .card-ink .eyebrow,
.reveal .card-ink li::marker {
  color: var(--deck-gold);
}

.reveal .card-ink code {
  color: var(--deck-ivory);
}

.reveal .card-ink a {
  text-decoration-color: var(--deck-gold);
}

.reveal .card-outline {
  border: 1px solid var(--deck-gold);
}

.reveal .card-wide {
  margin-top: 0.8em;
}

.reveal .card-tall {
  min-height: 9em;
}

.reveal .eyebrow {
  display: block;
  font-size: 0.7em;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--deck-gold-deep);
}

.reveal .card-grid {
  display: grid;
  gap: 0.6em;
  margin-top: 0.4em;
}

.reveal .card-grid > .card {
  margin: 0;
}

.reveal .card-grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.reveal .card-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.reveal .card-grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* Rule index: a spec-sheet grid of italic names under gold hairlines. */
.reveal .rule-index {
  row-gap: 0.45em;
}

.reveal .rule-index .card {
  border-top: 1px solid var(--deck-gold);
  padding: 0.4em 0.2em 0;
  min-height: 0;
  font-size: 0.75em;
}

.reveal .rule-index strong {
  font-family: var(--deck-display);
  font-variation-settings: "opsz" 28;
  font-style: italic;
  font-weight: 500;
  font-size: 1.35em;
  line-height: 1.2;
}

.reveal .rule-number {
  display: block;
  font-size: 0.75em;
  font-weight: 600;
  letter-spacing: 0.25em;
  color: var(--deck-gold-deep);
  margin-bottom: 0.4em;
}

.reveal .diagram-card {
  padding: 0.4em 0.6em;
  text-align: center;
}

/* Keep the workflow legible while leaving room for the text cards below. */
.reveal .diagram-card img.guardrails-workflow {
  display: block;
  width: 100%;
  height: auto;
  max-height: 260px;
  object-fit: contain;
  margin: 0 auto;
}

/* ---------- Tables, code, and lists ---------- */

.reveal .table-card {
  background: var(--deck-stone);
  padding: 0.6em 1em;
}

.reveal .table-card table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85em;
}

.reveal .table-card th,
.reveal .table-card td {
  border-bottom: 1px solid var(--deck-gold);
  padding: 0.4em 0.6em;
  text-align: left;
}

.reveal .table-card tr:last-child td {
  border-bottom: none;
}

.reveal .table-card thead th {
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.75em;
  color: var(--deck-gold-deep);
}

.reveal .table-card tbody td:first-child {
  font-family: var(--deck-display);
  font-variation-settings: "opsz" 28;
  font-style: italic;
  font-size: 1.15em;
}

.reveal .slides div.sourceCode {
  background: var(--deck-stone);
  border: none;
  border-radius: 0;
  margin: 0 0 0.6em;
}

.reveal div.sourceCode pre {
  background: transparent;
  border: none;
}

/* Syntax colours from the deck palette (contrast-checked on stone). */
.reveal div.sourceCode code,
.reveal div.sourceCode code span {
  color: var(--deck-ink);
}

.reveal div.sourceCode code span.co,
.reveal div.sourceCode code span.do,
.reveal div.sourceCode code span.cv {
  color: var(--deck-muted);
  font-style: italic;
}

.reveal div.sourceCode code span.dt,
.reveal div.sourceCode code span.kw,
.reveal div.sourceCode code span.cf {
  color: var(--deck-ink);
  font-weight: 600;
}

.reveal div.sourceCode code span.fu,
.reveal div.sourceCode code span.va,
.reveal div.sourceCode code span.at,
.reveal div.sourceCode code span.op,
.reveal div.sourceCode code span.er {
  color: var(--deck-ink);
}

.reveal div.sourceCode code span.st,
.reveal div.sourceCode code span.ch,
.reveal div.sourceCode code span.ss,
.reveal div.sourceCode code span.vs,
.reveal div.sourceCode code span.dv,
.reveal div.sourceCode code span.fl,
.reveal div.sourceCode code span.bn {
  color: var(--deck-gold-deep);
}

/* Filename header (```{.lang filename="..."}): an ink tab with a gold label. */
.reveal .code-with-filename {
  margin: 0 0 0.6em;
}

.reveal .code-with-filename .code-with-filename-file {
  background: var(--deck-ink);
  border: none;
  border-bottom: 1px solid var(--deck-gold);
  border-radius: 0;
  padding: 0.45em 0.9em;
}

.reveal .code-with-filename .code-with-filename-file pre {
  margin: 0;
  padding: 0;
  background: none;
  box-shadow: none;
  font-family: var(--deck-sans);
  font-size: 0.42em;
  line-height: 1.4;
}

/* Keep the filename's real case: filenames are case-sensitive. */
.reveal .code-with-filename .code-with-filename-file strong {
  font-family: var(--deck-mono);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--deck-gold);
}

.reveal .code-with-filename .slides div.sourceCode,
.reveal .code-with-filename div.sourceCode {
  margin: 0;
}

.reveal code,
.reveal pre,
.reveal pre code {
  font-family: var(--deck-mono);
}

.reveal code {
  color: inherit;
}

.reveal .reading-list ul {
  font-size: 1em;
  line-height: 1.45;
}

.reveal .reading-list li {
  margin-bottom: 0.35em;
}

.reveal .reading-list li::marker {
  color: var(--deck-gold-deep);
}

/* ---------- Reveal chrome ---------- */

.reveal .controls {
  color: var(--deck-gold-deep);
}

.reveal .progress {
  color: var(--deck-gold);
}

.reveal .slide-number {
  background: transparent;
  color: var(--deck-muted);
  font-family: var(--deck-sans);
  letter-spacing: 0.1em;
}

/* Quarto's menu icon is a navy SVG; recolour it to the deck's ink. */
.reveal .slide-menu-button .fa-bars::before {
  background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%23141414" viewBox="0 0 16 16"><path fill-rule="evenodd" d="M2.5 12a.5.5 0 0 1 .5-.5h10a.5.5 0 0 1 0 1H3a.5.5 0 0 1-.5-.5zm0-4a.5.5 0 0 1 .5-.5h10a.5.5 0 0 1 0 1H3a.5.5 0 0 1-.5-.5zm0-4a.5.5 0 0 1 .5-.5h10a.5.5 0 0 1 0 1H3a.5.5 0 0 1-.5-.5z"/></svg>');
}

/* Links in the closing slide's icon row. */
.reveal .deck-icon-link {
  color: var(--deck-ink);
}

/* Name dense slides for assistive technology without moving their content. */
.reveal .slides section.sr-only-heading > h2 {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* Mermaid's default blue edge labels are too light on their grey backing. */
.reveal svg .edgeLabel p {
  color: #1a1a1a !important;
}

/* Lightweight SVG masks using Font Awesome Free 6.7.2 paths. Icons: CC BY 4.0; https://fontawesome.com/license/free */

.deck-icon {
  --deck-icon-image: none;
  display: inline-block;
  width: 1em;
  height: 1em;
  background-color: currentColor;
  -webkit-mask: var(--deck-icon-image) center / contain no-repeat;
  mask: var(--deck-icon-image) center / contain no-repeat;
  vertical-align: -0.125em;
}

.deck-icon-2xl {
  width: 2em;
  height: 2em;
  vertical-align: -0.1875em;
}

.deck-icon-brands-github {
  --deck-icon-image: url("data:image/svg+xml;base64,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");
}

.deck-icon-brands-linkedin {
  --deck-icon-image: url("data:image/svg+xml;base64,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");
}

.deck-icon-solid-envelope {
  --deck-icon-image: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCA1MTIgNTEyIj48cGF0aCBkPSJNNDggNjRDMjEuNSA2NCAwIDg1LjUgMCAxMTJjMCAxNS4xIDcuMSAyOS4zIDE5LjIgMzguNEwyMzYuOCAzMTMuNmMxMS40IDguNSAyNyA4LjUgMzguNCAwTDQ5Mi44IDE1MC40YzEyLjEtOS4xIDE5LjItMjMuMyAxOS4yLTM4LjRjMC0yNi41LTIxLjUtNDgtNDgtNDhMNDggNjR6TTAgMTc2TDAgMzg0YzAgMzUuMyAyOC43IDY0IDY0IDY0bDM4NCAwYzM1LjMgMCA2NC0yOC43IDY0LTY0bDAtMjA4TDI5NC40IDMzOS4yYy0yMi44IDE3LjEtNTQgMTcuMS03Ni44IDBMMCAxNzZ6Ii8+PC9zdmc+");
}