/* ==========================================================================
   ذَرّة | ZARRA — Chemical Activity Series Styles
   أنماط متسلسلة النشاط الكيميائي وتفاعلات الإزاحة البسيطة
   ========================================================================== */

.activity-series-layout {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: var(--spacing-xl);
  align-items: start;
}

/* عمود سلم النشاط الكيميائي */
.activity-ladder-card {
  background: var(--color-bg-surface);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

.ladder-header {
  margin-bottom: var(--spacing-md);
  text-align: center;
}

.activity-direction-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 6px 12px;
  background: linear-gradient(135deg, rgba(233, 75, 103, 0.1), rgba(255, 217, 106, 0.1));
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.ladder-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.ladder-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  background: var(--color-bg-surface-soft);
  border: 1px solid var(--color-border-soft);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.ladder-item:hover {
  transform: translateX(-4px);
  border-color: var(--color-primary);
}

.ladder-item.selected {
  border-color: var(--color-primary);
  background: rgba(233, 75, 103, 0.08);
}

.ladder-elem-symbol {
  font-family: var(--font-chem-code);
  font-weight: 800;
  font-size: 1.1rem;
  width: 32px;
}

.ladder-elem-name {
  flex: 1;
  font-size: 0.85rem;
  padding: 0 8px;
  color: var(--color-text-main);
}

.ladder-elem-potential {
  font-family: var(--font-chem-code);
  font-size: 0.72rem;
  color: var(--color-text-muted);
  direction: ltr;
}

.ladder-badge-hydrogen {
  border: 1.5px dashed var(--color-primary);
  background: rgba(233, 75, 103, 0.05);
}

/* ساحة اختبار تفاعلات الإزاحة */
.reaction-arena-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);
  margin-bottom: var(--spacing-xl);
}

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

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

.arena-select-group label {
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--color-text-muted);
}

.arena-select {
  padding: 10px 14px;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--color-border-medium);
  background: var(--color-bg-surface);
  color: var(--color-text-main);
  font-family: var(--font-primary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.arena-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(233, 75, 103, 0.15);
}

/* المحاكاة البصرية للكأس والمعدن */
.beaker-simulation-display {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2xl);
  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-xl);
  min-height: 220px;
}

.sim-beaker {
  width: 140px;
  height: 180px;
  border: 3px solid rgba(150, 170, 190, 0.5);
  border-top: none;
  border-radius: 0 0 16px 16px;
  position: relative;
  background: rgba(255, 255, 255, 0.4);
  box-shadow: inset 0 -4px 12px rgba(0, 0, 0, 0.05);
  overflow: hidden;
}

[data-theme="dark"] .sim-beaker {
  background: rgba(30, 20, 20, 0.4);
  border-color: rgba(180, 200, 220, 0.3);
}

.sim-liquid {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 120px;
  background: rgba(77, 171, 247, 0.4);
  transition: background 0.6s ease;
}

.sim-liquid-meniscus {
  position: absolute;
  top: -6px;
  left: 0;
  right: 0;
  height: 12px;
  border-radius: 50%;
  background: inherit;
  filter: brightness(1.1);
}

.sim-metal-strip {
  width: 24px;
  height: 130px;
  background: #cbd5e1;
  border: 1px solid #94a3b8;
  position: absolute;
  left: 50%;
  top: 15px;
  transform: translateX(-50%) rotate(4deg);
  border-radius: 2px;
  transition: all 0.5s ease;
  z-index: 2;
  box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.15);
}

.sim-gas-bubbles {
  position: absolute;
  bottom: 10px;
  left: 0;
  right: 0;
  height: 100px;
  pointer-events: none;
  display: none;
}

.sim-gas-bubbles.active {
  display: block;
}

.bubble {
  position: absolute;
  bottom: 0;
  width: 6px;
  height: 6px;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 50%;
  animation: riseUp 1.2s infinite ease-in;
}

@keyframes riseUp {
  0% { transform: translateY(0) scale(0.6); opacity: 0; }
  50% { opacity: 0.9; }
  100% { transform: translateY(-100px) scale(1.2); opacity: 0; }
}

/* بطاقة نتائج التفاعل والمعادلة */
.arena-result-banner {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: 12px;
}

.arena-result-banner.success {
  background: rgba(184, 216, 194, 0.2);
  border: 1px solid var(--color-mint-dark);
  color: var(--color-mint-dark);
}

.arena-result-banner.no-reaction {
  background: rgba(233, 75, 103, 0.1);
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
}

.arena-equation-display {
  background: var(--color-bg-surface-soft);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-soft);
  font-family: var(--font-chem-code);
  font-size: 1.2rem;
  font-weight: 700;
  text-align: center;
  direction: ltr;
  color: var(--color-text-main);
  margin-bottom: var(--spacing-md);
}

/* وضع التحدي واختبار الذكاء الكيميائي */
.activity-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-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

@media (max-width: 991px) {
  .activity-series-layout {
    grid-template-columns: 1fr;
  }
  .arena-controls {
    grid-template-columns: 1fr;
  }
}