/* SCB-specific styles, layered on the shared Nerfies/MathVista template. */
:root {
  --scb-navy: #24427c;
  --scb-green: #2e7d4f;
  --scb-red: #b3261e;
  --scb-line: #dbdfe6;
  --scb-soft: #f4f6fa;
}

/* two-stage walkthrough */
.walkthrough {
  border: 1px solid var(--scb-line);
  border-radius: 10px;
  padding: 1.25rem 1.25rem 1.5rem;
  background: #fff;
}
.wt-stage {
  text-align: center;
  font-size: 1.05rem;
  color: var(--scb-navy);
  margin-bottom: 0.6rem;
}
.wt-question {
  border: 1px solid var(--scb-line);
  border-radius: 8px;
  background: var(--scb-soft);
  padding: 0.8rem 1rem;
  margin: 0 auto 0.9rem;
  max-width: 720px;
  text-align: center;
  font-weight: 600;
}
.wt-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  max-width: 720px;
  margin: 0 auto;
}
@media (max-width: 560px) { .wt-grid { grid-template-columns: 1fr; } }
.wt-tile {
  border: 1.5px solid var(--scb-line);
  border-radius: 8px;
  overflow: hidden;
  cursor: pointer;
  background: #fff;
  padding: 0;
  width: 100%;
  text-align: left;
  font: inherit;
  transition: border-color 120ms ease;
}
.wt-tile:hover { border-color: var(--scb-navy); }
.wt-tile .tile-label {
  display: block;
  padding: 0.3rem 0.7rem;
  font-size: 0.92rem;
  border-bottom: 1px solid var(--scb-line);
  background: var(--scb-soft);
}
.wt-tile .tile-media { display: block; aspect-ratio: 4 / 3; background: #eef0f4; }
.wt-tile .tile-media img { display: block; width: 100%; height: 100%; object-fit: cover; }
.wt-revealed .wt-tile { cursor: default; }
.wt-revealed .wt-tile.is-correct { border-color: var(--scb-green); }
.wt-revealed .wt-tile.is-correct .tile-label { background: #eef7f1; font-weight: 700; }
.wt-revealed .wt-tile.is-wrong { opacity: 0.5; }
.wt-hint { text-align: center; font-size: 0.85rem; color: #6a6f7a; margin-top: 0.75rem; }

.wt-stage2 { border-top: 1px solid var(--scb-line); margin-top: 1.4rem; padding-top: 1.2rem; }
.wt-verdict { text-align: center; margin-bottom: 0.9rem; }
.wt-verdict.is-right { color: var(--scb-green); font-weight: 600; }
.wt-verdict.is-wrong { color: var(--scb-red); }
.wt-mask-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  max-width: 720px;
  margin: 0 auto;
}
@media (max-width: 560px) { .wt-mask-row { grid-template-columns: 1fr; } }
.wt-mask-row figure { margin: 0; }
.wt-mask-row img { display: block; width: 100%; border-radius: 6px; border: 1px solid var(--scb-line); }
.wt-mask-row figcaption { font-size: 0.85rem; color: #4a4f58; margin-top: 0.45rem; text-align: center; }
.wt-source-note { font-size: 0.8rem; color: #6a6f7a; text-align: center; margin-top: 0.9rem; }

/* Inline SVG icons (the FontAwesome script is no longer loaded) */
.svg-icon { display: inline-block; width: 1em; height: 1em; vertical-align: -0.125em; fill: currentColor; }