/* Keynote-like deck styling for a locked 1920×1080 frame.
   All sizes are literal slide pixels: the export pins Reveal to scale 1,
   so 1 CSS px here is 1 px in charm.pdf. */

:root {
  /* Ink */
  --ink: #111418;
  --muted: #71787f;
  --faint: #9aa1a8;
  --line: #dfe3e7;

  /* Accents, sampled from the Keynote deck */
  --ref: #1a56a8;
  --accent: #ff0a9b;
  --title-a: #357ee3;
  --title-b: #b932f9;

  /* Frame */
  --slide-w: 1920px;
  --slide-h: 1080px;
  --gutter-x: 104px;
  --gutter-top: 58px;
  --gutter-bottom: 62px;

  /* Type scale */
  --fs-body: 42px;
  --fs-title: 76px;
  --fs-subtitle: 46px;
  --fs-ref: 24px;
  --fs-caption: 30px;
  --fs-chrome: 24px;

  --canvas-bg: #eceef1;

  /* Take over Reveal's own font variables (the simple theme points headings
     at "News Cycle", which is not bundled and falls back to plain Helvetica). */
  --deck-font: "Helvetica Neue", HelveticaNeue, Helvetica, Arial, sans-serif;
  --r-main-font: var(--deck-font);
  --r-heading-font: var(--deck-font);
  --r-heading-font-weight: 700;
  --r-heading-line-height: 1.1;
  --r-heading-letter-spacing: -0.012em;
  --r-heading-text-transform: none;
  --r-heading-color: var(--ink);
  --r-heading-margin: 0;
}

html,
body {
  background: var(--canvas-bg);
  height: 100%;
  margin: 0;
}

.reveal-viewport {
  align-items: center;
  box-sizing: border-box;
  display: flex;
  justify-content: center;
  min-height: 100%;
  overflow: auto;
  padding: 1.25rem;
}

.reveal {
  aspect-ratio: 16 / 9;
  background: #fff;
  box-shadow: 0 8px 32px rgba(20, 30, 45, 0.08);
  box-sizing: border-box;
  color: var(--ink);
  font-family: var(--deck-font);
  font-size: var(--fs-body);
  font-weight: 400;
  overflow: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

.reveal .slides {
  background: transparent;
  margin: 0;
  text-align: left;
}

.reveal .slides > section,
.reveal .slides > section > section {
  box-sizing: border-box !important;
  height: calc(100% - var(--gutter-top) - var(--gutter-bottom)) !important;
  left: var(--gutter-x) !important;
  overflow: hidden;
  padding: 0 !important;
  top: var(--gutter-top) !important;
  width: calc(100% - 2 * var(--gutter-x)) !important;
}

/* Content slides are a column: title block, then a body that fills the rest. */
.reveal .slides > section:not(.section-title):not(.title-card):not(#title-slide) {
  align-items: stretch;
  display: flex !important;
  flex-direction: column;
}

/* ── Type ────────────────────────────────────────────────────── */

.reveal h1,
.reveal h2,
.reveal h3,
.reveal h4 {
  color: var(--ink);
  font-family: var(--deck-font);
  font-weight: 700;
  letter-spacing: -0.012em;
  text-transform: none;
}

.reveal h2 {
  flex: 0 0 auto;
  font-size: var(--fs-title);
  line-height: 1.1;
  margin: 0 0 0.05em;
}

.reveal h2:empty {
  display: none;
}

/* Keynote's bold second line under the title. */
.reveal .slides > section:not(.section-title) > .subtitle {
  color: var(--ink);
  flex: 0 0 auto;
  font-size: var(--fs-subtitle);
  font-weight: 700;
  letter-spacing: -0.008em;
  line-height: 1.18;
  margin: 0.14em 0 0;
}

.reveal .slides > section:not(.section-title) > .subtitle p {
  margin: 0;
}

.reveal h3 {
  font-size: 0.88em;
  font-weight: 700;
  margin: 0 0 0.35em;
}

.reveal p,
.reveal li {
  line-height: 1.34;
}

.reveal p {
  margin: 0 0 0.55em;
}

.reveal strong {
  font-weight: 700;
}

.reveal em {
  font-style: italic;
}

/* Bullets, Keynote-style: marker in the gutter, text hanging. */
.reveal ul {
  display: flex;
  flex-direction: column;
  gap: 0.5em;
  list-style: none;
  margin: 0.1em 0 0.3em;
  padding: 0;
}

.reveal ul > li {
  margin: 0;
  padding-left: 1.05em;
  position: relative;
}

.reveal ul > li::before {
  background: #4a5058;
  border-radius: 50%;
  content: "";
  height: 0.23em;
  left: 0.14em;
  position: absolute;
  top: 0.54em;
  width: 0.23em;
}

.reveal ul ul {
  gap: 0.3em;
  margin: 0.35em 0 0;
}

.reveal ul ul > li::before {
  background: var(--faint);
  border-radius: 0;
  height: 2px;
  top: 0.64em;
  width: 0.36em;
}

.reveal ol {
  display: flex;
  flex-direction: column;
  gap: 0.5em;
  margin: 0.1em 0 0.3em;
  padding-left: 1.1em;
}

.reveal ol > li {
  margin: 0;
  padding-left: 0.2em;
}

/* ── Math ────────────────────────────────────────────────────── */

.reveal .MathJax,
.reveal mjx-container {
  color: var(--ink);
}

/* Display equations read as part of the left column, not as centred islands. */
.reveal mjx-container[jax="CHTML"][display="true"] {
  margin: 0.5em 0 0.6em !important;
  text-align: left;
}

.reveal mjx-container[jax="CHTML"][display="true"] > mjx-math {
  margin: 0 !important;
  padding-left: 0.1em;
}

.reveal .eq-center mjx-container[jax="CHTML"][display="true"],
.reveal .eq-center mjx-container[jax="CHTML"][display="true"] > mjx-math {
  text-align: center;
  margin-left: auto !important;
  margin-right: auto !important;
}

/* ── References, top right ───────────────────────────────────── */

.slide-refs {
  align-items: flex-end;
  display: flex;
  flex-direction: column;
  font-size: var(--fs-ref);
  gap: 0.25em;
  left: auto;
  line-height: 1.3;
  margin: 0;
  max-width: 34%;
  pointer-events: auto;
  position: absolute;
  right: 0;
  top: 0.55em;
  z-index: 6;
}

.slide-refs p {
  margin: 0;
}

.slide-refs a {
  color: var(--ref);
  font-size: var(--fs-ref);
  text-align: right;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.reveal section:has(.slide-refs) > h2 {
  max-width: 64%;
  padding-right: 0.3em;
}

.reveal section.section-title .slide-refs,
.reveal section.title-card .slide-refs,
.reveal #title-slide .slide-refs {
  display: none;
}

/* ── Body region ─────────────────────────────────────────────── */

/* Injected by charm.qmd: everything after the title block. */
.slide-body {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  /* `safe` degrades to flex-start when the content is taller than the box,
     so a full slide never rides up over its own title. */
  justify-content: safe center;
  min-height: 0;
  /* Extra bottom padding pushes the centred block above the middle,
     the way a Keynote text box sits. */
  padding: 0.35em 0 1.6em;
}

/* When the body carries a block that wants to grow, let it grow instead. */
.slide-body:has(> .figure-side),
.slide-body:has(> .figure-slide),
.slide-body:has(> .two-figures),
.slide-body:has(> .three-figures),
.slide-body:has(> .plan-list) {
  justify-content: stretch;
  padding-bottom: 0.2em;
}

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

/* ── Title card ──────────────────────────────────────────────── */

.reveal section.title-card {
  text-align: center;
}

.reveal section.title-card h2 {
  background: linear-gradient(95deg, var(--title-a) 0%, var(--title-b) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: 112px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.08;
  margin: 2.55em 0 0;
  max-width: none;
}

.reveal section.title-card .title-lines {
  color: var(--ink);
  font-size: 44px;
  line-height: 1.85;
  margin-top: 0.75em;
}

.reveal section.title-card .title-lines p:first-child {
  font-size: 46px;
  margin-bottom: 0.7em;
}

.reveal section.title-card .title-lines p:last-child {
  color: var(--muted);
  font-size: 36px;
}

.reveal section.title-card .title-logo-rub,
.reveal section.title-card .title-logo-fsp,
.reveal section.title-card .title-logo-lhcb {
  border: 0;
  box-shadow: none;
  display: block;
  margin: 0;
  position: absolute;
}

.reveal section.title-card .title-logo-rub {
  height: 96px;
  left: 0;
  top: 0;
  width: auto;
}

.reveal section.title-card .title-logo-fsp {
  height: 82px;
  right: 208px;
  top: 8px;
  width: auto;
}

.reveal section.title-card .title-logo-lhcb {
  height: 84px;
  right: 0;
  top: 6px;
  width: auto;
}

/* ── Section divider ─────────────────────────────────────────── */

.reveal section.section-title {
  align-items: center;
  display: flex !important;
  flex-direction: column;
  justify-content: center;
  text-align: center;
}

.reveal section.section-title h2 {
  border: 0;
  color: var(--accent);
  font-size: 104px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0;
  max-width: none;
  padding: 0;
}

.reveal section.section-title h2 mjx-container {
  color: var(--accent);
}

.reveal section.section-title .subtitle {
  color: var(--muted);
  font-size: 38px;
  font-style: normal;
  font-weight: 400;
  margin: 0.7em 0 0;
  max-width: 24em;
}

.reveal section.section-title .subtitle p {
  margin: 0;
}

/* ── Layouts ─────────────────────────────────────────────────── */

.reveal img {
  background: transparent;
  border: 0;
  box-shadow: none;
  display: block;
  object-fit: contain;
}

.figure-side {
  align-items: stretch;
  display: grid;
  flex: 1 1 auto;
  gap: 52px;
  grid-template-columns: minmax(0, 0.47fr) minmax(0, 0.53fr);
  min-height: 0;
}

.figure-side.wide-text {
  grid-template-columns: minmax(0, 0.54fr) minmax(0, 0.46fr);
}

/* Short caption, big map: give the plot the width it needs to fill the height. */
.figure-side.wide-fig {
  gap: 44px;
  grid-template-columns: minmax(0, 0.38fr) minmax(0, 0.62fr);
}

.figure-side > p,
.figure-side > figure {
  align-items: center;
  display: flex;
  justify-content: center;
  margin: 0;
  min-height: 0;
  min-width: 0;
}

/* The text column centres; a live block stretches to the row. */
.figure-side > div:not(.frames):not(.widget) {
  align-self: center;
}

.figure-side > .frames {
  align-self: stretch;
}

.figure-side > div {
  min-width: 0;
}

.figure-side img {
  height: 100%;
  max-height: 100%;
  max-width: 100%;
  width: auto;
}

.figure-side ul {
  margin-top: 0.2em;
}

.two-col {
  align-items: start;
  display: grid;
  flex: 0 1 auto;
  gap: 72px;
  grid-template-columns: 1fr 1fr;
  min-height: 0;
}

.three-col {
  align-items: start;
  display: grid;
  gap: 40px;
  grid-template-columns: repeat(3, 1fr);
}

.two-figures,
.three-figures {
  display: grid;
  flex: 1 1 auto;
  gap: 40px;
  min-height: 0;
}

.two-figures {
  grid-template-columns: 1fr 1fr;
}

.three-figures {
  align-items: center;
  grid-template-columns: repeat(3, 1fr);
}

.two-figures > p,
.three-figures > p {
  align-items: center;
  display: flex;
  height: 100%;
  justify-content: center;
  margin: 0;
  min-height: 0;
  min-width: 0;
}

.two-figures img,
.three-figures img {
  height: auto;
  max-height: 100%;
  width: 100%;
}

.figure-slide {
  align-items: center;
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  justify-content: center;
  min-height: 0;
}

/* The image box takes the leftover height; the image letterboxes inside it.
   A percentage max-height would not resolve against an auto-height flex item. */
.figure-slide > p,
.figure-slide > figure {
  flex: 1 1 auto;
  margin: 0;
  min-height: 0;
  position: relative;
  width: 100%;
}

.figure-slide > p > img,
.figure-slide > figure img {
  height: 100%;
  left: 0;
  object-fit: contain;
  position: absolute;
  top: 0;
  width: 100%;
}

.figure-slide > .caption {
  flex: 0 0 auto;
}

.caption {
  color: var(--muted);
  flex: 0 0 auto;
  font-size: var(--fs-caption);
  line-height: 1.4;
  margin: 0.7em 0 0;
}

.figure-slide .caption,
.three-figures + .caption,
.two-figures + .caption {
  margin-left: auto;
  margin-right: auto;
  max-width: 52em;
  text-align: center;
}

.quiet {
  color: var(--muted);
  font-size: 0.78em;
}

/* Links in slide text, matching the reference colour. */
.reveal .slide-body a,
.reveal .slides > section > p a,
.reveal li a {
  color: var(--ref);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

.reveal table,
.reveal .slides table,
.reveal .slides section table {
  border-collapse: collapse;
  font-size: 0.86em;
  margin: 0.3em 0 0.5em;
  width: max-content !important;
}

.reveal th,
.reveal td {
  border-bottom: 1px solid var(--line);
  padding: 0.3em 1.4em 0.3em 0;
  white-space: nowrap;
}

.reveal thead th {
  border-bottom: 2px solid var(--ink);
  color: var(--muted);
  font-weight: 700;
}

.numbers {
  border-collapse: collapse;
  font-size: 0.8em;
  margin-top: 0.35em;
}

.numbers th,
.numbers td {
  border-bottom: 1px solid var(--line);
  padding: 0.3em 0.9em 0.3em 0;
  text-align: right;
}

.numbers th:first-child,
.numbers td:first-child {
  text-align: left;
}

.numbers th {
  color: var(--muted);
  font-weight: 700;
}

/* ── Plan and close ──────────────────────────────────────────── */

.plan-list {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 0.75em;
  justify-content: center;
  list-style: none;
  margin: 0;
  max-width: 32em;
  padding: 0;
}

.plan-list li {
  padding-left: 1.05em;
  position: relative;
}

.plan-list li::before {
  background: var(--accent);
  border-radius: 50%;
  content: "";
  height: 0.23em;
  left: 0.14em;
  position: absolute;
  top: 0.54em;
  width: 0.23em;
}

.plan-list strong {
  font-weight: 700;
}

.reveal section.close-card .slide-body {
  justify-content: center;
}

.reveal section.close-card p {
  font-size: 1.05em;
  line-height: 1.42;
  margin: 0 0 0.75em;
  max-width: 26em;
}

/* ── Animations ──────────────────────────────────────────────── */

/* A frame sequence with a scrub slider. The stage takes the height it is
   given; the frame letterboxes inside it, so the layout never jumps as
   frames of slightly different size go past. */
.frames {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 14px;
  min-height: 0;
  min-width: 0;
  width: 100%;
}

.frames-stage {
  flex: 1 1 auto;
  min-height: 0;
  position: relative;
}

.frames-stage img {
  height: 100%;
  left: 0;
  object-fit: contain;
  position: absolute;
  top: 0;
  width: 100%;
}

.frames-bar {
  align-items: center;
  display: flex;
  flex: 0 0 auto;
  gap: 18px;
}

.frames-static .frames-bar {
  display: none;
}

.frames-play {
  align-items: center;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--ink);
  cursor: pointer;
  display: flex;
  flex: 0 0 auto;
  font-size: 18px;
  height: 44px;
  justify-content: center;
  line-height: 1;
  padding: 0;
  width: 44px;
}

.frames-play:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.frames-range {
  accent-color: var(--accent);
  cursor: pointer;
  flex: 1 1 auto;
  height: 22px;
  min-width: 0;
}

.frames-readout {
  color: var(--muted);
  flex: 0 0 auto;
  font-size: var(--fs-caption);
  font-variant-numeric: tabular-nums;
  min-width: 7em;
  text-align: right;
}

/* A plain video figure: `<video class="video-figure" ...>` */
.video-figure {
  background: transparent;
  display: block;
  height: 100%;
  object-fit: contain;
  width: 100%;
}

.figure-slide > .frames,
.figure-slide > .widget,
.figure-slide > .video-figure {
  flex: 1 1 auto;
  min-height: 0;
  width: 100%;
}

/* ── Chrome ──────────────────────────────────────────────────── */

.reveal .footer {
  display: none !important;
}

.reveal .slide-number {
  background: transparent !important;
  bottom: 22px !important;
  color: var(--faint) !important;
  font-family: inherit;
  font-size: var(--fs-chrome) !important;
  line-height: 1.2;
  position: absolute !important;
  right: var(--gutter-x) !important;
  z-index: 21;
}

.reveal .controls,
.reveal .progress,
.slide-menu-button,
.reveal .slide-chalkboard-buttons,
.reveal .chalkboard-button {
  display: none !important;
}

.reveal:has(.slides > section.title-card.present) .slide-number {
  display: none !important;
}

/* Locked 1920×1080 frame for `make pdf` (?export=1). */
html.export-pdf,
html.export-pdf body {
  background: #fff;
  height: 1080px;
  overflow: hidden;
  width: 1920px;
}

html.export-pdf .reveal-viewport {
  align-items: stretch;
  height: 1080px;
  justify-content: stretch;
  min-height: 1080px;
  overflow: hidden;
  padding: 0;
  width: 1920px;
}

html.export-pdf .reveal {
  aspect-ratio: auto;
  box-shadow: none;
  height: 1080px !important;
  width: 1920px !important;
}