/**
 * CampusQCM — Empty / Error / Loading states unifiés
 *
 * Usage:
 *   <div class="cq-empty">
 *     <div class="cq-empty__icon" aria-hidden="true">📚</div>
 *     <h3 class="cq-empty__title">Pas encore de QCM</h3>
 *     <p class="cq-empty__text">Lance ton premier QCM pour démarrer.</p>
 *     <a class="cq-empty__cta" href="/generer">Découvrir les QCM</a>
 *   </div>
 *
 * Variantes : .cq-empty--error, .cq-empty--success, .cq-empty--compact
 *
 * @package CampusQCM
 * @version 1.0.0 — 20 avril 2026
 */

.cq-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 56px 32px;
  background: var(--cq-bg-elevated, #fff);
  border: 1px dashed var(--cq-border-subtle, rgba(99, 102, 241, 0.18));
  border-radius: var(--cq-radius-card, 16px);
  color: var(--cq-text-secondary, #475569);
  gap: 12px;
}

.cq-empty--compact {
  padding: 32px 24px;
  gap: 8px;
}

.cq-empty__icon {
  width: 72px;
  height: 72px;
  border-radius: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.10), rgba(168, 85, 247, 0.10));
  color: #6366f1;
  margin-bottom: 8px;
  box-shadow: 0 8px 24px -8px rgba(99, 102, 241, 0.25);
}

.cq-empty__icon svg {
  width: 36px;
  height: 36px;
  stroke: currentColor;
  stroke-width: 1.6;
  fill: none;
}

.cq-empty__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--cq-text-primary, #0f172a);
  margin: 0;
  letter-spacing: -0.01em;
}

.cq-empty__text {
  font-size: 15px;
  line-height: 1.55;
  max-width: 440px;
  margin: 0;
  color: var(--cq-text-secondary, #475569);
}

.cq-empty__cta {
  margin-top: 12px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff;
  font-weight: 600;
  font-size: 14px;
  padding: 12px 22px;
  border-radius: 12px;
  text-decoration: none;
  transition: transform var(--cq-dur-fast, 120ms) ease, box-shadow var(--cq-dur-fast, 120ms) ease;
  box-shadow: var(--cq-glow-sm);
  border: 0;
  cursor: pointer;
}

.cq-empty__cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--cq-glow);
}

.cq-empty__cta--ghost {
  background: transparent;
  color: var(--cq-primary, #6366f1);
  border: 1px solid rgba(99, 102, 241, 0.25);
  box-shadow: none;
}

.cq-empty__hint {
  font-size: 13px;
  color: var(--cq-text-muted, #64748b);
  margin-top: 4px;
}

/* Variantes contextuelles */
.cq-empty--error {
  border-color: rgba(239, 68, 68, 0.25);
  background: rgba(239, 68, 68, 0.04);
}
.cq-empty--error .cq-empty__icon {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.12), rgba(249, 115, 22, 0.12));
  color: #dc2626;
}

.cq-empty--success {
  border-color: rgba(16, 185, 129, 0.25);
  background: rgba(16, 185, 129, 0.04);
}
.cq-empty--success .cq-empty__icon {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.14), rgba(6, 182, 212, 0.14));
  color: #059669;
}

/* Inline empty (à l'intérieur d'un panel existant) */
.cq-empty--inline {
  background: transparent;
  border: 0;
  padding: 32px 16px;
}

/* Dark mode */
body.qcm-dark .cq-empty {
  background: rgba(255, 255, 255, 0.02);
  border-color: rgba(255, 255, 255, 0.08);
}
body.qcm-dark .cq-empty__title { color: #f1f5f9; }
body.qcm-dark .cq-empty__text { color: #cbd5e1; }
body.qcm-dark .cq-empty__hint { color: #94a3b8; }

/* Responsive */
@media (max-width: 640px) {
  .cq-empty { padding: 40px 20px; }
  .cq-empty__title { font-size: 18px; }
  .cq-empty__text { font-size: 14px; }
}