/* Research-design teaching guides.
   Components inherit the Clean theme's light/dark colors. */

:root,
html[data-clean-theme="light"] {
  --fb-good: #1f6f6a;
  --fb-warn: #93560f;
  --fb-bad: #b5452b;
  --fb-good-bg: rgba(31, 111, 106, .13);
  --fb-warn-bg: rgba(214, 150, 46, .2);
  --fb-bad-bg: rgba(181, 69, 43, .13);
}

html[data-clean-theme="dark"] {
  --fb-good: #a9ded2;
  --fb-warn: #f2c27b;
  --fb-bad: #ff8d78;
  --fb-good-bg: rgba(169, 222, 210, .15);
  --fb-warn-bg: rgba(242, 194, 123, .15);
  --fb-bad-bg: rgba(255, 141, 120, .15);
}

/* Card grids. */
.reveal .fb-grid-2,
.reveal .fb-grid-3,
.reveal .fb-grid-4 {
  display: grid;
  gap: .55em;
  margin: .35em 0;
}

.reveal .fb-grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.reveal .fb-grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.reveal .fb-grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.reveal .fb-card {
  background: var(--clean-surface);
  border: 1px solid var(--clean-line);
  border-left: 6px solid var(--clean-accent);
  border-radius: 6px;
  font-size: .72em;
  line-height: 1.35;
  padding: .5em .75em;
}

.reveal .fb-card.good {
  border-left-color: var(--fb-good);
}

.reveal .fb-card.warn {
  border-left-color: var(--fb-warn);
}

.reveal .fb-card.bad {
  border-left-color: var(--fb-bad);
}

.reveal .fb-card.plain {
  border-left-width: 1px;
}

.reveal .fb-card p {
  margin: .2em 0;
}

.reveal .fb-card ul,
.reveal .fb-card ol {
  margin: .15em 0 0 1.05em;
}

.reveal .fb-card li {
  margin: .12em 0;
}

.reveal .fb-card code {
  font-size: .92em;
  overflow-wrap: anywhere;
}

.reveal .fb-kicker {
  color: var(--clean-muted);
  display: block;
  font-size: .82em;
  font-weight: 700;
  letter-spacing: .07em;
  margin-bottom: .15em;
  text-transform: uppercase;
}

.reveal .fb-big {
  color: var(--clean-heading);
  display: block;
  font-size: 1.9em;
  font-weight: 600;
  line-height: 1.1;
}

/* Text helpers. */
.reveal .fb-note {
  color: var(--clean-muted);
  display: block;
  font-size: .64em;
  line-height: 1.35;
  margin-top: .35em;
}

.reveal .fb-small {
  font-size: .8em;
}

.reveal .fb-quote {
  border-left: 4px solid var(--fb-bad);
  font-size: .78em;
  font-style: italic;
  margin: .35em 0;
  padding: .15em .8em;
}

.reveal .fb-good-text {
  color: var(--fb-good);
  font-weight: 600;
}

.reveal .fb-bad-text {
  color: var(--fb-bad);
  font-weight: 600;
}

/* Tighter code on slides that carry starter code. */
.reveal section.fb-code div.sourceCode,
.reveal section.fb-code pre {
  margin: .25em 0;
}

/* The Clean theme fixes code at 20px; starter-code slides need more lines. */
.reveal section.fb-code pre code,
.reveal section.fb-code pre code.sourceCode {
  font-size: 15px;
  line-height: 1.32;
  max-height: none;
}

/* One table size across both decks (Reveal already makes cells "smaller"). */
.reveal .slides section table {
  font-size: .7em;
}

/* Inline code and citation links stay legible on the dark header row. */
.reveal .slides table thead code,
.reveal .slides table thead a {
  background: transparent;
  color: inherit;
}

/* Reference lists fit on one slide, including in print. */
.reveal .slides div#refs {
  font-size: .82em;
  line-height: 1.25;
}

/* Horizontal chain of boxes (question links, pipelines). */
.reveal .fb-flow {
  align-items: stretch;
  display: grid;
  gap: .35em;
  grid-template-columns: minmax(0, 1fr) 3.4em minmax(0, 1fr) 3.4em minmax(0, 1fr);
  margin: .45em 0;
}

.reveal .fb-flow.four {
  grid-template-columns: minmax(0, 1fr) 1.6em minmax(0, 1fr) 1.6em minmax(0, 1fr) 1.6em minmax(0, 1fr);
}

.reveal .fb-node {
  background: var(--clean-surface);
  border: 1px solid var(--clean-line);
  border-radius: 8px;
  border-top: 6px solid var(--clean-accent);
  font-size: .64em;
  line-height: 1.32;
  padding: .5em .7em;
}

.reveal .fb-flow.four .fb-node strong:first-child {
  font-size: .98em;
  overflow-wrap: anywhere;
}

.reveal .fb-node.alt {
  border-top-color: var(--clean-accent-2);
}

.reveal .fb-node strong:first-child {
  color: var(--clean-heading);
  display: block;
  font-size: 1.12em;
  margin-bottom: .2em;
}

.reveal .fb-arrow {
  align-self: center;
  color: var(--clean-accent-2);
  font-size: 1.15em;
  line-height: 1;
  text-align: center;
}

.reveal .fb-arrow small {
  color: var(--clean-muted);
  display: block;
  font-size: .42em;
  font-weight: 700;
  letter-spacing: .05em;
  margin-top: .25em;
  text-transform: uppercase;
}

/* Year strip (sample-period slide). */
.reveal .fb-years {
  display: grid;
  gap: 4px;
  grid-template-columns: repeat(20, minmax(0, 1fr));
  margin: 1.1em 0 .4em;
}

.reveal .fb-years .yr,
.reveal .fb-legend .sw {
  background: var(--clean-surface);
  border: 1px solid var(--clean-line);
  border-radius: 4px;
  box-sizing: border-box;
}

.reveal .fb-years .yr {
  font-size: .42em;
  padding: .7em 0;
  position: relative;
  text-align: center;
}

.reveal .fb-years .yr.window,
.reveal .fb-legend .sw.window {
  border: 3px solid var(--clean-accent);
}

.reveal .fb-years .yr.covid,
.reveal .fb-legend .sw.covid {
  background: repeating-linear-gradient(135deg, var(--fb-bad-bg) 0 5px, transparent 5px 10px);
}

.reveal .fb-years .yr.covid {
  color: var(--clean-muted);
  text-decoration: line-through;
}

.reveal .fb-years .yr.smoke::after,
.reveal .fb-legend .dot {
  background: var(--clean-accent-2);
  border-radius: 50%;
  content: "";
  display: inline-block;
  height: 11px;
  width: 11px;
}

.reveal .fb-years .yr.smoke::after {
  left: 50%;
  position: absolute;
  top: -17px;
  transform: translateX(-50%);
}

.reveal .fb-legend {
  color: var(--clean-muted);
  display: flex;
  flex-wrap: wrap;
  font-size: .52em;
  gap: .4em 1.4em;
  margin-bottom: .6em;
}

.reveal .fb-legend > span {
  align-items: center;
  display: inline-flex;
  gap: .4em;
}

.reveal .fb-legend .sw {
  display: inline-block;
  height: 16px;
  width: 22px;
}

/* Cross-validation diagram: one row per fold, one cell per year. */
.reveal .fb-cv {
  align-items: center;
  display: grid;
  font-size: .62em;
  gap: 3px;
  grid-template-columns: 7em repeat(12, minmax(0, 1fr));
  margin: .3em 0 .45em;
}

.reveal .fb-cv .lab {
  color: var(--clean-muted);
  padding-right: .4em;
  text-align: right;
  white-space: nowrap;
}

.reveal .fb-cv .head {
  color: var(--clean-muted);
  text-align: center;
}

.reveal .fb-cv .c {
  border-radius: 3px;
  height: 1.35em;
}

.reveal .fb-cv .tr {
  background: color-mix(in srgb, var(--clean-accent) 38%, transparent);
}

.reveal .fb-cv .te {
  background: var(--clean-accent-2);
}

.reveal .fb-cv .na {
  background: var(--clean-surface-soft);
}

.reveal .fb-legend .sw.tr {
  background: color-mix(in srgb, var(--clean-accent) 38%, transparent);
}

.reveal .fb-legend .sw.te {
  background: var(--clean-accent-2);
}

.reveal .fb-legend .sw.na {
  background: var(--clean-surface-soft);
}

.reveal .fb-cv-title {
  color: var(--clean-heading);
  display: block;
  font-size: .62em;
  font-weight: 600;
  margin: .2em 0 .25em;
}

/* Season strip for the forecast-date slide. */
.reveal .fb-season {
  display: grid;
  gap: 4px;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  margin: 1.7em 0 .5em;
}

.reveal .fb-season .m {
  background: var(--clean-surface);
  border: 1px solid var(--clean-line);
  border-radius: 4px;
  font-size: .62em;
  padding: .45em 0;
  position: relative;
  text-align: center;
}

.reveal .fb-season .m.known {
  background: color-mix(in srgb, var(--clean-accent) 22%, var(--clean-surface));
}

.reveal .fb-season .m.cut::before {
  background: var(--clean-accent-2);
  bottom: -6px;
  content: "";
  left: -5px;
  position: absolute;
  top: -6px;
  width: 4px;
}

.reveal .fb-season .m.cut::after {
  color: var(--clean-accent-2);
  content: "Forecast date: June 1";
  font-size: .95em;
  font-weight: 700;
  left: -5px;
  position: absolute;
  top: -1.9em;
  white-space: nowrap;
}

/* Inline SVG diagrams. */
.reveal svg.fb-dag {
  display: block;
  height: auto;
  margin: .2em auto 0;
  max-width: 100%;
}

.reveal svg.fb-dag .node rect {
  fill: var(--clean-surface);
  stroke: var(--clean-line);
  stroke-width: 1.5;
}

.reveal svg.fb-dag .node.confounder rect {
  stroke: var(--fb-good);
  stroke-width: 3.5;
}

.reveal svg.fb-dag .node.mediator rect {
  stroke: var(--fb-bad);
  stroke-width: 3.5;
}

.reveal svg.fb-dag text {
  fill: var(--clean-ink);
  font-family: Optima, "Optima Web", "DM Sans", system-ui, sans-serif;
  font-size: 22px;
}

.reveal svg.fb-dag text.lab {
  fill: var(--clean-muted);
  font-size: 17px;
  font-style: italic;
}

.reveal svg.fb-dag text.good {
  fill: var(--fb-good);
  font-size: 17px;
  font-weight: 700;
}

.reveal svg.fb-dag text.bad {
  fill: var(--fb-bad);
  font-size: 17px;
  font-weight: 700;
}

.reveal svg.fb-dag .edge {
  fill: none;
  marker-end: url(#fb-arrow);
  stroke: var(--clean-ink);
  stroke-width: 2.5;
}

.reveal svg.fb-dag .edge.dashed {
  stroke-dasharray: 7 6;
}

.reveal svg.fb-dag .edge.blocked {
  stroke: var(--clean-muted);
  stroke-dasharray: 3 6;
}

.reveal svg.fb-dag .arrowhead {
  fill: var(--clean-ink);
}

/* Figure from a student report, framed like a card. */
.reveal .fb-figure img {
  background: #ffffff;
  border: 1px solid var(--clean-line);
  border-radius: 6px;
  padding: 6px;
}

/* Incremental reveals (with incremental-content.html): a card or code frame
   stays hidden until its first step appears, so no empty box shows early. */
.reveal .slides section.slide.level2 .fb-card:has(.fragment):not(:has(.fragment.visible)),
.reveal .slides section.slide.level2 div.sourceCode:has(pre.fragment):not(:has(pre.fragment.visible)) {
  visibility: hidden;
}

/* A highlight ring drawn over a diagram node at a later step. */
.reveal svg.fb-dag .ring-bad {
  fill: none;
  stroke: var(--fb-bad);
  stroke-width: 3.5;
}

/* In a flow, an arrow appears together with the box it points to. */
.reveal .slides section.slide.level2 .fb-arrow:has(+ .fb-node.fragment:not(.visible)) {
  visibility: hidden;
}