/* ==========================================================================
   ذَرّة | ZARRA — Physical vs Chemical Change Styles
   أنماط موديول التغير الفيزيائي والتفاعل الكيميائي ومؤشراته
   ========================================================================== */

.pvc-concept-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.pvc-card {
  background: var(--color-bg-surface);
  border: 2px solid var(--color-border-soft);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.pvc-card.physical {
  border-top: 5px solid #4D96FF;
}

.pvc-card.chemical {
  border-top: 5px solid #E94B67;
}

.pvc-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
}

.pvc-card-title {
  font-size: 1.35rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
}

.pvc-rule-pill {
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 700;
}

.pvc-feature-list {
  list-style: none;
  padding: 0;
  margin: var(--spacing-md) 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.pvc-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--color-text-main);
}

.pvc-feature-item span.icon {
  font-size: 1.1rem;
}

/* لوحة علامات التفاعل الأربعة المصورة */
.signs-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
}

.sign-card {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  text-align: center;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-xs);
}

.sign-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.sign-icon-circle {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-circle);
  background: var(--color-bg-surface-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  margin: 0 auto var(--spacing-sm) auto;
  border: 1px solid var(--color-border-soft);
}

.sign-title {
  font-size: 0.95rem;
  font-weight: 800;
  margin-bottom: 4px;
  color: var(--color-text-main);
}

.sign-desc {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* معمل المقارنة البصرية التفاعلية */
.interactive-lab-theater {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
  box-shadow: var(--shadow-sm);
}

.scenario-tabs-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border-soft);
}

.btn-scenario-tab {
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border-medium);
  background: var(--color-bg-surface-soft);
  color: var(--color-text-muted);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.btn-scenario-tab.active,
.btn-scenario-tab:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(233, 75, 103, 0.08);
}

.stage-comparison-view {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  background: var(--color-bg-surface-soft);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  border: 1px solid var(--color-border-soft);
  margin-bottom: var(--spacing-lg);
}

.stage-display-box {
  background: var(--color-bg-surface);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  border: 1px solid var(--color-border-soft);
  text-align: center;
  position: relative;
  min-height: 240px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.stage-display-box svg {
  width: 150px;
  height: 140px;
  margin-bottom: var(--spacing-sm);
}

.stage-action-center {
  text-align: center;
  margin-top: var(--spacing-md);
}

/* ساحة تحدي التنبؤ بالمؤشرات */
.predictor-quiz-card {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
}

.quiz-scenario-card {
  background: var(--color-bg-surface-soft);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  border: 1px solid var(--color-border-soft);
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.quiz-scenario-icon {
  font-size: 3rem;
  background: var(--color-bg-surface);
  width: 80px;
  height: 80px;
  border-radius: var(--radius-circle);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border-soft);
  flex-shrink: 0;
}

.quiz-choices-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.btn-choice-predict {
  padding: 16px;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border-medium);
  background: var(--color-bg-surface);
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-choice-predict:hover:not(:disabled) {
  transform: translateY(-2px);
  border-color: var(--color-primary);
  background: rgba(233, 75, 103, 0.06);
}

.btn-choice-predict.choice-physical:hover:not(:disabled) {
  border-color: #4D96FF;
  background: rgba(77, 150, 255, 0.08);
}

.btn-choice-predict.choice-chemical:hover:not(:disabled) {
  border-color: #E94B67;
  background: rgba(233, 75, 103, 0.08);
}

.btn-choice-predict.correct {
  border-color: #6BCB77 !important;
  background: rgba(107, 203, 119, 0.15) !important;
  color: #2b7a37 !important;
}

.btn-choice-predict.incorrect {
  border-color: #FF6B6B !important;
  background: rgba(255, 107, 107, 0.15) !important;
  color: #c92a2a !important;
}

@media (max-width: 991px) {
  .pvc-concept-grid {
    grid-template-columns: 1fr;
  }
  .signs-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stage-comparison-view {
    grid-template-columns: 1fr;
  }
  .quiz-scenario-card {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 576px) {
  .signs-grid {
    grid-template-columns: 1fr;
  }
  .quiz-choices-group {
    grid-template-columns: 1fr;
  }
}