/* ==========================================================================
   موديول الأكسدة والاختزال والخلايا الكهروكيميائية | ZARRA Redox CSS
   ========================================================================== */

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

@media (max-width: 992px) {
  .redox-grid {
    grid-template-columns: 1fr;
  }
}

.redox-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);
  transition: all var(--transition-base);
}

.redox-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}

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

.redox-card-title {
  font-size: 1.2rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text-main);
  margin: 0;
}

/* محاكي الخلية الجلفانية */
.cell-simulation-container {
  background: var(--color-bg-surface-soft);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-soft);
  padding: var(--spacing-lg);
  position: relative;
  overflow: hidden;
}

.cell-visual-stage {
  width: 100%;
  height: 280px;
  background: linear-gradient(180deg, rgba(20, 25, 35, 0.95) 0%, rgba(10, 15, 25, 0.98) 100%);
  border-radius: var(--radius-md);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border-soft);
}

.cell-meters-bar {
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: var(--spacing-md);
  background: var(--color-bg-surface);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-md);
  border: 1px solid var(--color-border-soft);
}

.voltmeter-display {
  font-family: var(--font-chem-code);
  font-size: 1.6rem;
  font-weight: 800;
  color: #10b981;
  background: rgba(16, 185, 129, 0.1);
  padding: 6px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(16, 185, 129, 0.3);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.electrode-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.electrode-select-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.electrode-select-group label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text-muted);
}

/* بطاقات المعادلات وتدفق الشحنات */
.half-reaction-box {
  background: var(--color-bg-surface-soft);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border-right: 4px solid var(--color-primary);
  margin-top: var(--spacing-md);
}

.half-reaction-box.cathode-box {
  border-right-color: #3b82f6;
}

.half-reaction-box.anode-box {
  border-right-color: #ef4444;
}

/* حاسبة أعداد التأكسد */
.ox-presets-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: var(--spacing-sm) 0 var(--spacing-md) 0;
}

.ox-preset-btn {
  background: var(--color-bg-surface-soft);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  font-size: 0.8rem;
  font-family: var(--font-chem-code);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.ox-preset-btn:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.ox-step-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--color-bg-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-soft);
  margin-bottom: 6px;
  font-size: 0.9rem;
}

.ox-badge {
  font-family: var(--font-chem-code);
  font-weight: 800;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
}

.ox-badge.positive {
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
}

.ox-badge.negative {
  background: rgba(59, 130, 246, 0.15);
  color: #3b82f6;
}

.ox-badge.zero {
  background: rgba(156, 163, 175, 0.15);
  color: #9ca3af;
}

/* أداة تحدي الأكسدة والاختزال */
.challenge-box {
  background: linear-gradient(135deg, rgba(233, 75, 103, 0.05) 0%, rgba(20, 25, 35, 0.05) 100%);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}