.border {
  border: 1px solid #dee2e6;
}

.smaller {
  font-size: 0.85em;
}

.source-note {
  font-size: 0.55em;
  color: #999;
  margin-top: 0.5em;
}

figcaption {
  text-align: center !important;
}

.highlight-box {
  background: rgba(255, 255, 255, 0.07);
  border-left: 3px solid #f39c12;
  padding: 0.5em 0.8em;
  margin-top: 0.5em;
  border-radius: 4px;
}

.center-title h2 {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  text-align: center;
  font-size: 2em;
}

.compact-table table {
  font-size: 0.8em;
}

/* Row highlighting for truth tables that verify a Boolean encoding row by row.
   Green rows are admitted by the inequalities; red rows are cut off. Used on
   the AND / OR slides in `_04-logic.qmd`. */
.compact-table tr.row-ok td { background: rgba(80, 160, 80, 0.22); }
.compact-table tr.row-bad td { background: rgba(200, 70, 70, 0.20); }

/* Platypus callout boxes — mirrors cpsat-primer style for RevealJS.
   Usage: ::: {.platypus-tip} / .platypus-warning / .platypus-info / .platypus-question / .platypus-confucypus
   The platypus appears on the left via ::before background-image. */
/* Grid layout (not flex): every paragraph in the body would otherwise become
   a separate flex item and render side-by-side. Grid pins the platypus image
   to its column and lets content paragraphs stack as rows in the other column. */
.platypus-tip,
.platypus-warning,
.platypus-info,
.platypus-question,
.platypus-confucypus,
.platypus-book,
.platypus-video,
.callout-warning {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  column-gap: 0.3em;
  border: 2px solid rgba(255,255,255,0.15);
  border-radius: 8px;
  padding: 0.4em 0.8em;
  margin: 0.5em 0;
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
}

.platypus-tip::before,
.platypus-warning::before,
.platypus-info::before,
.platypus-question::before,
.platypus-confucypus::before,
.platypus-book::before,
.platypus-video::before,
.callout-warning::before {
  content: "";
  width: 120px;
  height: 140px;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  grid-column: 1;
  grid-row: 1 / span 100;
  align-self: center;
}

/* Book/Video variants: platypus on the right via ::after */
.platypus-book,
.platypus-video {
  grid-template-columns: 1fr auto;
}

.platypus-book::after,
.platypus-video::after {
  grid-column: 2;
  grid-row: 1 / span 100;
  align-self: center;
}

.platypus-tip { background: rgba(80, 160, 80, 0.12); border-color: #5a9e5a; }
.platypus-tip::before { background-image: url('assets/idea_platypus.webp'); }

.platypus-warning,
.callout-warning { background: rgba(200, 120, 40, 0.12); border-color: #c87828; }
.platypus-warning::before,
.callout-warning::before { background-image: url('assets/warning_platypus.webp'); }

.callout-warning .callout-title { display: none; }

.platypus-info { background: rgba(60, 140, 200, 0.12); border-color: #3c8cc8; }
.platypus-info::before { background-image: url('assets/info_platypus.webp'); }

.platypus-question { background: rgba(180, 140, 60, 0.12); border-color: #b48c3c; }
.platypus-question::before { background-image: url('assets/platypus-thinking.png'); }

.platypus-confucypus { background: rgba(140, 110, 80, 0.12); border-color: #8c6e50; font-style: italic; }
.platypus-confucypus::before {
  background-image: url('assets/confucypus.png');
  width: 180px;
  height: 210px;
}

.platypus-book { background: rgba(140, 100, 200, 0.12); border-color: #8c64c8; }
.platypus-book::before { display: none; }
.platypus-book::after {
  content: "";
  flex-shrink: 0;
  width: 150px;
  height: 180px;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  background-image: url('assets/book_platypus.webp');
}

.platypus-video { background: rgba(200, 60, 80, 0.12); border-color: #c83c50; }
.platypus-video::before { display: none; }
.platypus-video::after {
  content: "";
  flex-shrink: 0;
  width: 150px;
  height: 180px;
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  background-image: url('assets/tv_platypus.webp');
}

/* Output / terminal output blocks — visually distinct from source code.
   Quarto renders ```text as: pre.sourceCode.text > code.sourceCode
   (language is a class on <pre>, not on <code>) */
pre.sourceCode.text {
  background: #0d1a26 !important;
  border-left: 3px solid #4fc3f7;
  border-radius: 4px;
  position: relative;
  padding-top: 1.6em !important;
}

pre.sourceCode.text::before {
  content: "▶ output";
  position: absolute;
  top: 0.3em;
  left: 0.8em;
  font-size: 0.65em;
  font-family: monospace;
  color: #4fc3f7;
  opacity: 0.75;
  letter-spacing: 0.06em;
}

pre.sourceCode.text code {
  color: #a8c8a0 !important;
  background: transparent !important;
}

/* Slide-scoped code shrink — apply with `## Title {.smaller-code}` when a
   side-by-side code comparison would otherwise overflow its column.
   Theme default is .reveal pre { font-size: .55em }; this drops it ~10%. */
.smaller-code pre.sourceCode {
  font-size: 0.5em;
}

/* Centered red banner — for a slide-wide punchline that needs to land harder
   than the standard orange platypus-warning (e.g. an NP-hardness twist on
   what looked like a valid LP). Apply with `::: {.red-banner}`. */
.red-banner {
  background: rgba(200, 50, 50, 0.18);
  border-left: 4px solid #d94545;
  padding: 0.5em 0.9em;
  margin-top: 0.6em;
  text-align: center;
  font-weight: 600;
  color: #ffb0b0;
  border-radius: 4px;
}

/* Instantaneous fragment swaps — used for step-by-step walkthroughs
   (e.g. Bloom filter in action) where the fade distracts from the
   visible state change. Apply with `.fragment.hard-swap`. */
.reveal .fragment.hard-swap {
  transition: none !important;
}