/* ==========================================================================
   ذَرّة | ZARRA — Matter Classification Styles
   أنماط معرض تصنيف المادة للمبتدئين (الذرة، العنصر، المركب، المخلوط)
   ========================================================================== */

.classification-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
}

.class-card {
  background: var(--color-bg-surface);
  border: 1.5px solid var(--color-border-soft);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.class-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: transparent;
  transition: background var(--transition-fast);
}

.class-card.active,
.class-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.class-card.card-atom.active::before { background: #E94B67; }
.class-card.card-element.active::before { background: #4D96FF; }
.class-card.card-compound.active::before { background: #6BCB77; }
.class-card.card-mixture.active::before { background: #FFD93D; }

.class-illustration {
  width: 140px;
  height: 120px;
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
}

.class-illustration svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.08));
}

.class-title {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 6px;
  color: var(--color-text-main);
}

.class-desc {
  font-size: var(--font-size-xs);
  line-height: 1.6;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
  flex: 1;
}

.class-examples-box {
  background: var(--color-bg-surface-soft);
  border-radius: var(--radius-md);
  padding: 8px 12px;
  width: 100%;
  font-size: 0.75rem;
  font-family: var(--font-chem-code);
  color: var(--color-primary);
  font-weight: 700;
  border: 1px solid var(--color-border-soft);
}

/* بطاقة استعراض النموذج المجهري التفاعلي */
.interactive-microscope-box {
  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);
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--spacing-xl);
  align-items: center;
}

.microscope-viewport {
  background: radial-gradient(circle at center, #1b263b 0%, #0d1b2a 100%);
  border-radius: var(--radius-lg);
  height: 280px;
  position: relative;
  overflow: hidden;
  border: 2px solid var(--color-border-medium);
  box-shadow: inset 0 0 20px rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
}

.microscope-viewport canvas {
  width: 100%;
  height: 100%;
}

.microscope-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.microscope-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 700;
  width: fit-content;
}

/* بطاقة لعبة التصنيف التفاعلية (The Sorter Arena) */
.sorter-game-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);
}

.sorter-hud-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border-soft);
}

.sorter-stats-row {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.sorter-stat-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 700;
}

.sorter-question-display {
  display: grid;
  grid-template-columns: 200px 1fr;
  align-items: center;
  gap: var(--spacing-xl);
  background: var(--color-bg-surface-soft);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  border: 1px solid var(--color-border-soft);
}

.sorter-visual-box {
  width: 180px;
  height: 150px;
  background: var(--color-bg-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-xs);
  padding: 10px;
}

.sorter-visual-box svg {
  width: 100%;
  height: 100%;
}

.sorter-question-text h3 {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 8px;
  color: var(--color-text-main);
}

.sorter-question-formula {
  display: inline-block;
  font-family: var(--font-chem-code);
  font-size: 1.1rem;
  color: var(--color-primary);
  background: rgba(233, 75, 103, 0.1);
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  direction: ltr;
}

.sorter-question-hint {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.sorter-options-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
}

.btn-sorter-choice {
  padding: 16px;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border-medium);
  background: var(--color-bg-surface);
  color: var(--color-text-main);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.btn-sorter-choice .choice-icon {
  font-size: 1.4rem;
}

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

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

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

.sorter-feedback-panel {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  display: none;
  animation: fadeIn 0.3s ease;
}

.sorter-feedback-panel.active {
  display: block;
}

@media (max-width: 991px) {
  .classification-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .interactive-microscope-box {
    grid-template-columns: 1fr;
  }
  .sorter-question-display {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .sorter-visual-box {
    margin: 0 auto;
  }
  .sorter-options-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .classification-grid {
    grid-template-columns: 1fr;
  }
  .sorter-options-grid {
    grid-template-columns: 1fr;
  }
}