.stroop-rules {
  margin: 0.75rem 0 0;
  max-width: 40rem;
  color: var(--color-text);
  font-size: 0.95rem;
  line-height: 1.45;
}

.stroop-rules__title {
  margin: 0 0 0.35rem;
  font-weight: 700;
}

.stroop-rules ul {
  margin: 0;
  padding-left: 1.2rem;
}

.stroop-rules li + li {
  margin-top: 0.2rem;
}

.stroop-stage {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 8rem;
  margin: 1.25rem 0 1rem;
  padding: 1.5rem 1rem;
  border: 1px solid var(--border-color, #d5dbe3);
  border-radius: 12px;
  background: var(--surface-elevated, #fff);
}

.stroop-stage.is-blank .stroop-word {
  visibility: hidden;
}

.stroop-word {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.25rem);
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 1.15;
  text-align: center;
  user-select: none;
}

.stroop-choices {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 1rem 0;
  max-width: 28rem;
}

@media (min-width: 520px) {
  .stroop-choices {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    max-width: 36rem;
  }
}

.stroop-choice {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
  padding: 0.75rem 0.5rem;
  border: 2px solid var(--border-color, #d5dbe3);
  border-radius: 10px;
  background: var(--surface-elevated, #fff);
  cursor: pointer;
  font: inherit;
  color: #1a1a1a;
}

.stroop-choice:disabled {
  cursor: default;
  opacity: 0.7;
}

.stroop-choice.is-selected {
  outline: 2px solid var(--accent, #2980b9);
  outline-offset: 2px;
}

.stroop-choice.is-correct {
  border-color: #1e8449;
  box-shadow: 0 0 0 2px rgba(30, 132, 73, 0.25);
}

.stroop-choice.is-wrong {
  border-color: #c0392b;
  box-shadow: 0 0 0 2px rgba(192, 57, 43, 0.2);
}

.stroop-choice__swatch {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 8px;
  border: 1px solid rgba(0, 0, 0, 0.12);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.25);
}

.stroop-choice__label {
  font-size: 0.95rem;
  font-weight: 600;
  color: #1a1a1a;
}

.stroop-summary {
  margin: 1rem 0;
  padding: 1rem 1.15rem;
  border-radius: 8px;
  background: var(--surface-muted, #f4f6f8);
  border-left: 4px solid var(--accent, #2980b9);
}

.stroop-summary__title {
  margin: 0 0 0.35rem;
  font-weight: 700;
}

.stroop-summary p {
  margin: 0;
  line-height: 1.45;
}

.stroop-detail-summary {
  margin: 1rem 0;
  padding: 1rem 1.15rem;
  border-radius: 8px;
  background: var(--surface-muted, #f4f6f8);
}

.stroop-detail-summary p {
  margin: 0.25rem 0;
}