/* ============================================================
   🤖 مساعد الطالب الذكي — زر عائم داخل الدرس + نافذة السؤال
   ============================================================ */

/* زر عائم يظهر فقط داخل صفحة "الدرس النشط" */
.ai-assistant-fab {
  position: fixed;
  bottom: calc(78px + env(safe-area-inset-bottom));
  right: var(--space-4);
  z-index: 60;
  display: none; /* يُفعَّل عبر JS فقط أثناء عرض الدرس */
  align-items: center;
  gap: var(--space-2);
  padding: 12px 18px;
  border: none;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.92rem;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  transition: transform var(--transition-base), box-shadow var(--transition-base), opacity var(--transition-base);
}
.ai-assistant-fab.visible { display: inline-flex; }
.ai-assistant-fab:hover { transform: translateY(-2px); box-shadow: 0 20px 44px rgba(27, 75, 67, 0.22); }
.ai-assistant-fab .emoji { font-size: 1.15rem; }
@media (min-width: 1024px) {
  .ai-assistant-fab { bottom: var(--space-5); }
}

/* الخلفية المعتمة خلف نافذة السؤال */
.ai-assistant-overlay {
  position: fixed;
  inset: 0;
  background: rgba(18, 56, 50, 0.45);
  backdrop-filter: blur(2px);
  z-index: 80;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}
.ai-assistant-overlay.open { opacity: 1; pointer-events: auto; }

@media (min-width: 640px) {
  .ai-assistant-overlay { align-items: center; }
}

/* لوحة السؤال — تنزلق من الأسفل في الجوال، وتظهر كنافذة في الشاشات الكبيرة */
.ai-assistant-panel {
  width: 100%;
  max-width: 480px;
  max-height: 82vh;
  background: var(--color-surface);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  transform: translateY(24px);
  transition: transform var(--transition-base);
}
.ai-assistant-overlay.open .ai-assistant-panel { transform: translateY(0); }
@media (min-width: 640px) {
  .ai-assistant-panel { border-radius: var(--radius-lg); max-height: 78vh; }
}

.ai-assistant-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
}
.ai-assistant-header h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--color-primary-dark);
}
.ai-assistant-header .lesson-name {
  display: block;
  margin-top: 2px;
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--color-text-muted);
}
.ai-assistant-close {
  border: none;
  background: var(--color-surface-2);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  font-size: 1rem;
  cursor: pointer;
  color: var(--color-text-muted);
  flex-shrink: 0;
}
.ai-assistant-close:hover { background: var(--color-border); }

.ai-assistant-body {
  padding: var(--space-5);
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.ai-assistant-hint {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.ai-assistant-form { display: flex; flex-direction: column; gap: var(--space-3); }
.ai-assistant-form textarea {
  width: 100%;
  min-height: 72px;
  resize: vertical;
  padding: 12px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  background: var(--color-surface-2);
  color: var(--color-text);
}
.ai-assistant-form textarea:focus {
  outline: none;
  border-color: var(--color-primary-light);
  background: var(--color-surface);
}
.ai-assistant-form button[type="submit"] { align-self: flex-end; }

/* سجل الأسئلة والأجوبة داخل الجلسة الحالية */
.ai-assistant-thread {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.ai-qa-item { display: flex; flex-direction: column; gap: var(--space-2); }
.ai-qa-question {
  align-self: flex-end;
  max-width: 90%;
  background: var(--color-primary);
  color: #fff;
  padding: 10px 14px;
  border-radius: var(--radius-md) var(--radius-md) 4px var(--radius-md);
  font-size: 0.9rem;
  line-height: 1.6;
}
.ai-qa-answer {
  align-self: flex-start;
  max-width: 92%;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  padding: 12px 14px;
  border-radius: var(--radius-md) var(--radius-md) var(--radius-md) 4px;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--color-text);
}
.ai-qa-answer.not-found { border-color: var(--color-accent-light); background: #FBF6E9; }
.ai-qa-sources {
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: 1px dashed var(--color-border);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.ai-source-chip {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  background: rgba(201, 162, 75, 0.18);
  border: 1px solid rgba(201, 162, 75, 0.35);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}
.ai-qa-loading {
  align-self: flex-start;
  display: flex;
  gap: 6px;
  padding: 12px 14px;
}
.ai-qa-loading span {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--color-primary-light);
  animation: aiDotBounce 1.1s infinite ease-in-out;
}
.ai-qa-loading span:nth-child(2) { animation-delay: 0.15s; }
.ai-qa-loading span:nth-child(3) { animation-delay: 0.3s; }
@keyframes aiDotBounce {
  0%, 80%, 100% { transform: translateY(0); opacity: 0.5; }
  40% { transform: translateY(-6px); opacity: 1; }
}
.ai-qa-error {
  align-self: flex-start;
  color: var(--color-danger);
  font-size: 0.85rem;
  background: rgba(181, 71, 58, 0.08);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
}