:root {
  --cardinal: #8C1515;
  --coolgrey: #4D4F53;
  --sandstone: #FAF6F0;
  --paloalto: #175E54;
  --slide-base: 20px;
  --content-scale: 1.45;
  --meta-scale: 1;
}

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

.reveal {
  font-family: "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
  color: rgba(0, 0, 0, 0.85);
  font-size: var(--slide-base);
}

.reveal .slides section {
  text-align: left;
  line-height: 1.32;
}

.reveal .textsc {
  font-variant: small-caps;
  text-transform: none;
  letter-spacing: 0.04em;
}

/* Title slide: cardinal banner + sandstone body */
.reveal .slides > section.title-slide-section {
  display: flex !important;
  flex-direction: column;
  height: 100%;
  max-height: 100%;
  overflow: hidden;
  box-sizing: border-box;
  padding: 0 !important;
  background: var(--sandstone);
  text-align: center;
}

.reveal .title-slide-banner {
  flex: 0 0 15%;
  min-height: 15%;
  background: var(--cardinal);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 1.2em;
}

.reveal .title-slide-banner h1 {
  color: #fff;
  font-family: "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
  font-size: calc(1.6em * 1.5);
  font-weight: 700;
  margin: 0;
  line-height: 1.15;
}

.reveal .title-slide-body {
  flex: 1 1 85%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  color: rgba(0, 0, 0, 0.85);
  padding: 1.5em 1.2em 1em;
  background: var(--sandstone);
}

.reveal .title-slide-body .title-slide-meta {
  margin: 0.25em 0 0.5em;
}

.reveal .title-slide-body .author {
  margin: 0.9em 0 0.35em;
}

.reveal .title-slide-body .institute,
.reveal .title-slide-body .date {
  margin: 0.25em 0;
}

.reveal .title-slide-body a {
  color: var(--cardinal);
  text-decoration: underline;
}

/* Title banner pinned; only slide body scrolls when content overflows */
.reveal .slides > section:has(.slide-title) {
  display: flex !important;
  flex-direction: column;
  height: 100%;
  max-height: 100%;
  overflow: hidden;
  box-sizing: border-box;
  padding-top: 0 !important;
  background: var(--sandstone);
}

.reveal .slide-title {
  background: var(--cardinal);
  color: #fff;
  padding: 0.28em 0.6em;
  margin: 0 calc(-1 * var(--r-block-padding, 0.6em)) 0.35em;
  padding-left: calc(var(--r-block-padding, 0.6em) + 0.6em);
  padding-right: calc(var(--r-block-padding, 0.6em) + 0.6em);
  font-size: calc(1.05em * 1.5);
  font-weight: 700;
  flex: 0 0 auto;
  position: relative;
  z-index: 20;
  font-variant: small-caps;
  text-transform: none;
  letter-spacing: 0.04em;
}

.reveal .slide-body {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
}

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

/* Main bullet/equation columns — 2.5× prior compact scale */
.reveal .slide-content {
  font-size: calc(var(--slide-base) * var(--content-scale));
}

.reveal .slide-content p,
.reveal .slide-content li,
.reveal .slide-content ol,
.reveal .slide-content ul {
  font-size: 1em;
}

.reveal .slide-content .meta-text {
  font-size: 1em;
}

/* Lecture map, outline — readable full size */
.reveal .meta-text,
.reveal .lecture-map,
.reveal .toc-list {
  font-size: calc(var(--slide-base) * var(--meta-scale));
}

.reveal .slide-content .toc-list,
.reveal .slide-content .lecture-map {
  font-size: 1em;
}

.reveal .slide-content .fbox,
.reveal .slide-content .gbox,
.reveal .slide-content .kbox {
  font-size: 0.9em;
}

.reveal .slide-content .katex {
  font-size: 1em;
}

.reveal ul,
.reveal ol {
  display: block;
  margin-left: 1.1em;
}

.reveal li {
  margin-bottom: 0.22em;
}

.reveal p {
  margin: 0.3em 0;
}

.reveal a {
  color: var(--cardinal);
}

.reveal .cols {
  display: grid;
  grid-template-columns: 0.84fr 1.16fr;
  gap: 0.7rem;
  align-items: center;
}

.reveal .cols-text-wide {
  grid-template-columns: 0.88fr 1.12fr;
}

.reveal .cols-33 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.55rem;
}

.reveal .cols-top {
  align-items: start;
}

.reveal .diagram-wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 280px;
}

.reveal .fig-full .diagram-wrap {
  min-height: auto;
  margin-top: 0.35rem;
}

.reveal .slide-fig {
  display: block;
  max-width: 100%;
  max-height: 400px;
  width: auto;
  height: auto;
  margin: 0 auto;
  object-fit: contain;
}

.reveal .fig-full .slide-fig {
  max-height: 340px;
}

.reveal .figcap {
  text-align: center;
  font-size: 0.88em;
  color: rgba(0, 0, 0, 0.7);
  margin-top: 0.3em;
  line-height: 1.25;
}

.reveal .fig-row {
  display: flex;
  gap: 0.55rem;
  align-items: flex-start;
  justify-content: center;
}

.reveal .fig-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.45rem 0.65rem;
}

.reveal .fig-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.reveal .fig-cell .slide-fig {
  max-height: 200px;
}

.reveal .fig-label {
  font-size: calc(var(--slide-base) * var(--content-scale) * 0.88);
  line-height: 1.28;
  margin-top: 0.25em;
  color: rgba(0, 0, 0, 0.82);
}

.reveal .fig-label strong {
  color: var(--cardinal);
}

.reveal .fig-label .katex {
  font-size: 1em;
}

.reveal .fbox .katex,
.reveal .gbox .katex,
.reveal .kbox .katex,
.reveal .flow-row .katex {
  font-size: 1em;
}

.reveal .katex-error {
  color: var(--cardinal);
}

.reveal .lec-badge {
  display: inline-block;
  color: var(--cardinal);
  font-size: 0.92em;
  margin-top: 0.35em;
}

.reveal .example-block {
  background: rgba(23, 94, 84, 0.07);
  border-left: 4px solid var(--paloalto);
  padding: 0.45em 0.65em;
  margin-top: 0.45em;
  font-size: calc(var(--slide-base) * var(--meta-scale));
}

.reveal .example-block strong {
  color: var(--paloalto);
}

.reveal .sym-note {
  margin-top: 0.45em;
  padding-top: 0.4em;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
  line-height: 1.38;
  color: rgba(0, 0, 0, 0.68);
}

.reveal .slide-content .sym-note {
  font-size: 0.72em;
}

.reveal .flow-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  margin: 0.4rem 0;
}

.reveal .fbox,
.reveal .gbox,
.reveal .kbox {
  border-radius: 4px;
  padding: 0.35em 0.45em;
  font-size: calc(var(--slide-base) * 0.9);
  font-weight: 600;
  text-align: center;
  min-width: 6em;
  line-height: 1.2;
  font-variant: small-caps;
  text-transform: none;
  letter-spacing: 0.03em;
}

.reveal .fbox {
  border: 2px solid var(--cardinal);
  background: rgba(140, 21, 21, 0.07);
}

.reveal .gbox {
  border: 2px solid var(--paloalto);
  background: rgba(23, 94, 84, 0.07);
}

.reveal .kbox {
  border: 2px solid var(--coolgrey);
  background: rgba(77, 79, 83, 0.08);
}

.reveal .arrow {
  color: var(--coolgrey);
  font-size: 1em;
  font-weight: 700;
}

.reveal .toc-list {
  columns: 2;
  column-gap: 1.25rem;
}

.reveal .toc-list h4 {
  color: rgba(0, 0, 0, 0.85);
  margin-bottom: 0.3em;
  font-weight: 700;
  text-transform: none;
}

.reveal .lecture-map {
  line-height: 1.22;
}

.reveal .lecture-map h4 {
  color: rgba(0, 0, 0, 0.85);
  font-size: 1.05em;
  margin-bottom: 0.35em;
  font-weight: 700;
  text-transform: none;
}

.reveal .lecture-map ol,
.reveal .lecture-map ul {
  margin-left: 1.2em;
}

.reveal .lecture-map li {
  margin-bottom: 0.15em;
}

/* Consistent KaTeX sizing relative to surrounding text */
.reveal .katex {
  font-size: 1em;
}

.reveal .slide-content .katex-display {
  font-size: 1em;
  margin: 0.2em 0 0.3em;
}

.reveal .meta-text .katex,
.reveal .lecture-map .katex,
.reveal .toc-list .katex {
  font-size: 1em;
}

.reveal .progress span {
  background: var(--cardinal);
}

.reveal .controls button {
  color: var(--cardinal);
}

@media (max-width: 900px) {
  :root {
    --slide-base: 18px;
  }

  .reveal .cols,
  .reveal .cols-33,
  .reveal .cols-text-wide {
    grid-template-columns: 1fr;
  }

  .reveal .diagram-wrap {
    min-height: 220px;
  }

  .reveal .fig-cell .slide-fig {
    max-height: 160px;
  }

  .reveal .fig-row {
    flex-direction: column;
  }
}