/* ============================================================
   HTML slide template — mirrors the SimplePlusAIC Beamer look.
   Reference slide size: 1280 x 720 (16:9). All typography is
   expressed in `em` so the deck scales with --slide-scale.
   ============================================================ */

:root {
  /* Structure color = Brown University brown (Beamer "Brown"). */
  --c-structure:  #4E3629;
  --c-structure-soft: #8a6f5e;
  --c-light:      #E6CDBE;          /* LightBrown */

  /* User accent colors from your preamble.tex */
  --c-blue:       #0056B3;
  --c-red:        #FA2D19;
  --c-green:      #1E8449;
  --c-orange:     #E07B00;

  /* Block colors (Beamer "blocks") */
  --c-block-bg:        #f6efe8;
  --c-block-title-bg:  var(--c-structure);
  --c-alert-title-bg:  #C0392B;
  --c-alert-body-bg:   #fbecea;
  --c-example-title-bg:#2C7A6B;
  --c-example-body-bg: #eaf5f2;

  --c-bg:         #ffffff;
  --c-text:       #1a1a1a;
  --c-muted:      #6b6b6b;
  --c-rule:       #e2dcd6;

  --font-sans: "Helvetica Neue", "Arial", "Liberation Sans", sans-serif;
  --font-serif: "Latin Modern Roman", "Computer Modern", Cambria, Georgia, serif;
  --font-mono: "JetBrains Mono", "Menlo", "Consolas", monospace;
}

/* ---------- page chrome ---------- */
html, body {
  margin: 0;
  padding: 0;
  background: #2b2b2b;            /* dark surround so the slide pops */
  color: var(--c-text);
  font-family: var(--font-sans);
  overflow: hidden;
  height: 100%;
}

/* Stage: a fixed viewport-sized clipper. Each slide is absolutely
   anchored at 50/50 and then `translate(-50%,-50%) scale()`d. This
   keeps the slide center pinned to the viewport center even when the
   un-scaled 1280×720 box is larger than the viewport (which it usually
   is). The scale factor is set in JS as `--slide-scale` on :root. */
#stage {
  position: fixed;
  inset: 0;
  overflow: hidden;
}

.slide {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 1280px;
  height: 720px;
  transform: translate(-50%, -50%) scale(var(--slide-scale, 1));
  transform-origin: center center;
  background: var(--c-bg);
  color: var(--c-text);
  display: none;                  /* only .slide.active is shown */
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
  overflow: hidden;
  font-size: 22px;                /* base unit; everything below uses em */
  line-height: 1.35;
}
.slide.active { display: block; }

/* ---------- frame title + progress bar (content slides) ---------- */
.slide > .frame-title {
  font-weight: 700;
  font-size: 1.6em;
  color: var(--c-structure);
  padding: 0.9em 1.5em 0.2em;
  letter-spacing: -0.005em;
}

.slide > .progress {
  margin: 0 1.5em;
  height: 2px;
  background: #e8e2dc;
  position: relative;
}
.slide > .progress > .progress-fill {
  position: absolute;
  inset: 0 auto 0 0;
  background: var(--c-structure);
  width: var(--progress, 0%);
}
.slide > .progress > .progress-num {
  position: absolute;
  right: 0;
  bottom: 4px;
  font-size: 0.55em;
  color: var(--c-muted);
}

/* ---------- body ---------- */
.slide > .body {
  padding: 1.1em 2em 0;
  height: calc(720px - 6.5em);    /* leave room for title + footer */
  box-sizing: border-box;
  overflow: hidden;
}

.slide .subtitle {
  color: var(--c-blue);
  font-weight: 700;
  font-size: 1em;
  margin: 0 0 0.6em;
}

/* ---------- footer ---------- */
.slide > .foot {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0.45em 1.5em;
  font-size: 0.55em;
  color: white;
  background: var(--c-structure);
}
.slide > .foot .right { text-align: right; }

/* ---------- title slide variant ---------- */
.slide.title-slide > .body {
  padding: 9em 2.2em 0;
  height: 720px;
}
.slide.title-slide .title {
  font-size: 2.5em;
  font-weight: 700;
  color: var(--c-structure);
  margin: 0 0 0.3em;
  letter-spacing: -0.01em;
}
.slide.title-slide .subtitle-big {
  font-size: 1.5em;
  color: var(--c-structure-soft);
  margin: 0 0 1.5em;
  font-weight: 500;
}
.slide.title-slide .author {
  font-size: 1.3em;
  margin: 0 0 0.2em;
}
.slide.title-slide .author small { color: var(--c-muted); }
.slide.title-slide .institute {
  font-size: 0.8em;
  color: var(--c-muted);
  margin: 0.3em 0em 2em;
}
.slide.title-slide .collaborators {
  font-size: 0.8em;
  color: var(--c-muted);
  margin: 0.3em 0em 2em;
}
.slide.title-slide .date {
  font-size: 1em;
  color: var(--c-muted);
  margin: 0.3em 0;
}
.slide.title-slide .logos {
  position: absolute;
  right: 1.8em;
  bottom: 1.8em;
  display: flex;
  gap: 1.5em;
  align-items: center;
}
.slide.title-slide .logos img { height: 100px; width: auto; }
.slide.title-slide .corner-logo {
  position: absolute;
  top: 1.5em;
  left: 1.8em;
  height: 60px;
}

/* ---------- section divider slide ---------- */
.slide.section-slide { background: var(--c-structure); color: white; }
.slide.section-slide > .body {
  display: grid;
  place-content: center;
  text-align: center;
  height: 720px;
  padding: 0 3em;
}
.slide.section-slide .section-number {
  font-size: 1em;
  letter-spacing: 0.3em;
  color: var(--c-light);
  margin-bottom: 0.5em;
}
.slide.section-slide .section-title {
  font-size: 2.4em;
  font-weight: 700;
  letter-spacing: -0.01em;
}

/* ---------- text helpers (mirror \BLUE \RED \GREEN \ORANGE) ---------- */
.blue   { color: var(--c-blue); }
.red    { color: var(--c-red); }
.green  { color: var(--c-green); }
.orange { color: var(--c-orange); }
.muted  { color: var(--c-muted); }
.bold   { font-weight: 700; }
.center { text-align: center; }

/* ---------- itemize / enumerate ---------- */
.slide ul, .slide ol {
  padding-left: 1.2em;
  margin: 0.3em 0;
}
.slide ul > li, .slide ol > li {
  margin: 0.35em 0;
}
.slide ul { list-style: none; }
.slide ul > li::before {
  content: "•";
  color: var(--c-structure);
  font-weight: 700;
  display: inline-block;
  width: 1em;
  margin-left: -1em;
}

/* ---------- two/three column layout ---------- */
.cols {
  display: grid;
  gap: 1.5em;
}
.cols.c2 { grid-template-columns: 1fr 1fr; }
.cols.c2-55-45 { grid-template-columns: 55fr 45fr; }
.cols.c2-60-40 { grid-template-columns: 60fr 40fr; }
.cols.c3 { grid-template-columns: 1fr 1fr 1fr; }

/* ---------- blocks (\begin{block}, \begin{alertblock}, ...) ---------- */
.block {
  margin: 0.5em 0;
  border-radius: 4px;
  overflow: hidden;
}
.block > .block-title {
  background: var(--c-block-title-bg);
  color: white;
  padding: 0.35em 0.8em;
  font-weight: 600;
}
.block > .block-body {
  background: var(--c-block-bg);
  padding: 0.6em 0.8em;
}
.block.alert > .block-title { background: var(--c-alert-title-bg); }
.block.alert > .block-body  { background: var(--c-alert-body-bg); }
.block.example > .block-title { background: var(--c-example-title-bg); }
.block.example > .block-body  { background: var(--c-example-body-bg); }

/* ---------- figures ---------- */
.slide figure {
  margin: 0.5em auto;
  text-align: center;
}
.slide figure img,
.slide figure video {
  max-width: 100%;
  max-height: 420px;
  object-fit: contain;
}
.slide figcaption {
  font-size: 0.7em;
  color: var(--c-muted);
  margin-top: 0.3em;
}

/* ---------- math (MathJax serif) ---------- */
mjx-container { font-family: var(--font-serif) !important; }

/* ---------- code ---------- */
.slide code {
  font-family: var(--font-mono);
  background: #f4f0ec;
  padding: 0.05em 0.3em;
  border-radius: 3px;
  font-size: 0.9em;
}
.slide pre {
  background: #f4f0ec;
  padding: 0.7em 0.9em;
  border-left: 3px solid var(--c-structure);
  font-size: 0.8em;
  overflow: auto;
}

/* ---------- fragments (\uncover<n->) ---------- */
.fragment {
  opacity: 0;
  transition: opacity 0.15s linear;
}
.fragment.visible { opacity: 1; }

/* ---------- references / footnotes ---------- */
.slide .footnote {
  position: absolute;
  left: 1.8em;
  right: 1.8em;
  bottom: 2.2em;
  font-size: 0.55em;
  color: var(--c-muted);
  border-top: 1px solid var(--c-rule);
  padding-top: 0.3em;
}

/* ---------- HUD: slide counter + help ---------- */
#hud {
  position: fixed;
  bottom: 12px;
  right: 16px;
  color: #bbb;
  font-family: var(--font-mono);
  font-size: 12px;
  pointer-events: none;
  z-index: 10;
}
#help {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.78);
  color: white;
  display: none;
  place-items: center;
  z-index: 20;
  font-family: var(--font-sans);
}
#help.show { display: grid; }
#help kbd {
  background: #444;
  border: 1px solid #666;
  border-bottom-width: 2px;
  padding: 1px 7px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
}
#help table { border-spacing: 16px 8px; }

/* ---------- print: one slide per page, no chrome ---------- */
@media print {
  @page { size: 1280px 720px; margin: 0; }
  html, body { background: white; overflow: visible; height: auto; }
  #stage { position: static; overflow: visible; }
  #hud, #help { display: none !important; }
  .slide {
    display: block !important;
    position: static;
    transform: none !important;
    page-break-after: always;
    box-shadow: none;
  }
  .fragment { opacity: 1 !important; }   /* show all fragments when printing */
}