/* =========================================================================
   Attentional Blink — tool-specific styling
   -------------------------------------------------------------------------
   Shared page furniture comes from components/tool-kit.css. What is specific
   here is the RSVP stream box, the digit keypad and the lag chart.

   PRESENTATION SAFETY
   -------------------
   Only the character inside the box changes. The box, its background, its
   size and its position stay constant, so there is no large-area luminance
   change of the kind associated with photosensitive reactions — the changing
   region is a single glyph. No CSS animation or transition is used; the text
   node is replaced, nothing fades or moves.
   ---------------------------------------------------------------------- */

/* Absolutely positioned visually-hidden <caption> elements have no positioned
   ancestor inside a scroller, which adds ~30px to the document's scrollable
   width at 320px. Candidate for components/tool-kit.css. */
.table-scroll {
  position: relative;
}

#blink .interactive__controls,
#blink .interactive__stage {
  min-width: 0;
}

@media (min-width: 52em) {
  #blink .interactive__body {
    grid-template-columns: minmax(0, 18rem) minmax(0, 1fr);
  }
}

#blink .control + .control {
  margin-top: var(--space-4);
}

/* -------------------------------------------------------------------------
   The stream
   ---------------------------------------------------------------------- */

.stream {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 10rem;
  padding: var(--space-5);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-md);
  background-color: var(--colour-surface);
}

.stream__item {
  font-family: var(--font-mono);
  font-size: 4.5rem;
  line-height: 1;
  font-weight: 700;
  color: var(--colour-text);
  /* A fixed box, so a wide glyph never nudges the layout mid-stream. */
  display: inline-block;
  min-width: 3.5rem;
  text-align: center;
}

.display__caption {
  margin: 0;
  min-height: 2.5rem;
  font-size: var(--text-sm);
  color: var(--colour-text-muted);
  text-align: center;
}

/* -------------------------------------------------------------------------
   Answers
   ---------------------------------------------------------------------- */

.stage__form {
  display: grid;
  gap: var(--space-4);
}

.stage__form > * {
  min-width: 0;
}

.digits {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.digits .button {
  flex: 1 1 3.5rem;
  min-height: 3.25rem;
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
}

.responses {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.response {
  flex: 1 1 11rem;
  min-height: 3.25rem;
  font-size: var(--text-base);
  font-weight: 650;
}

/* -------------------------------------------------------------------------
   Lag chart
   -------------------------------------------------------------------------
   Two series: second-target accuracy conditioned on the first, and
   first-target accuracy. They differ by line style, marker shape and an
   inline label, so none of the three is load-bearing on its own.
   ---------------------------------------------------------------------- */

.blink-chart {
  max-width: 28rem;
}

.blink__line--t2 {
  fill: none;
  stroke: var(--colour-accent);
  stroke-width: 2.5;
}

.blink__line--t1 {
  fill: none;
  stroke: var(--colour-text-muted);
  stroke-width: 2.5;
  stroke-dasharray: 7 4;
}

.blink__point--t2 {
  fill: var(--colour-accent);
}

.blink__point--t1 {
  fill: var(--colour-page);
  stroke: var(--colour-text-muted);
  stroke-width: 2.5;
}

/* -------------------------------------------------------------------------
   Challenge
   ---------------------------------------------------------------------- */

.challenge select {
  width: 100%;
  min-width: 12rem;
  min-height: 2.75rem;
  padding: 0.35rem 0.6rem;
  font: inherit;
  font-size: var(--text-sm);
  color: var(--colour-text);
  background-color: var(--colour-surface-raised);
  border: 1px solid var(--colour-border-strong);
  border-radius: var(--radius-sm);
}

.challenge th[scope="row"] {
  min-width: 15rem;
  font-weight: 400;
}

.challenge__mark {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  color: var(--colour-text-muted);
}

/* -------------------------------------------------------------------------
   Forced colours
   ---------------------------------------------------------------------- */

@media (forced-colors: active) {
  .stream {
    border: 1px solid CanvasText;
  }

  .stream__item {
    color: CanvasText;
  }

  .blink__line--t2,
  .blink__point--t2 {
    stroke: CanvasText;
    fill: CanvasText;
  }

  .blink__line--t2 {
    fill: none;
  }

  .blink__line--t1 {
    stroke: Highlight;
  }

  .blink__point--t1 {
    fill: Canvas;
    stroke: Highlight;
  }

  .challenge select {
    border: 1px solid ButtonText;
  }
}