/**
 * Skeleton Loaders CSS
 * Design glassmorphism/gold cohérent avec N.O.G
 * Animations shimmer uniformes sur tous les éléments
 */

/* ==================== Base Skeleton Styles ==================== */

/* Animation shimmer avec effet vague gold */
@keyframes skeleton-shimmer {
  0% {
    background-position: -468px 0;
  }
  100% {
    background-position: 468px 0;
  }
}

/* Classe de base pour tous les skeletons */
.skeleton-loading {
  pointer-events: none;
  user-select: none;
}

/* Placeholder de base avec glassmorphism */
.skeleton-placeholder {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  pointer-events: none;
}

/* Effet shimmer subtil gris/blanc */
.skeleton-shimmer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.4) 20%,
    rgba(255, 255, 255, 0.6) 50%,
    rgba(255, 255, 255, 0.4) 80%,
    transparent 100%
  );
  background-size: 468px 100%;
  /* ✅ IMPORTANT: background-attachment: fixed pour shimmer uniforme */
  background-attachment: fixed;
  animation: skeleton-shimmer 2s linear infinite;
  pointer-events: none;
  z-index: 1;
}

/* ==================== Skeleton Cards (pour l'historique) ==================== */

.skeleton-card.history-conversation-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 20px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  position: relative;
  overflow: hidden;
  cursor: default;
  min-height: 70px;
}

/* Effet shimmer subtil sur les cartes */
.skeleton-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.4) 20%,
    rgba(255, 255, 255, 0.6) 50%,
    rgba(255, 255, 255, 0.4) 80%,
    transparent 100%
  );
  background-size: 468px 100%;
  background-attachment: fixed;
  animation: skeleton-shimmer 2s linear infinite;
  pointer-events: none;
  z-index: 1;
}

/* Contenu de la carte skeleton (au-dessus du shimmer) */
.skeleton-card > * {
  position: relative;
  z-index: 2;
}

/* Cercle skeleton (pour la checkbox) */
.skeleton-circle {
  width: 24px;
  height: 24px;
  background: rgba(0, 0, 0, 0.08);
  border-radius: 6px;
  flex-shrink: 0;
}

/* Ligne de texte skeleton */
.skeleton-text {
  height: 16px;
  background: rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}

.skeleton-text:last-child {
  margin-bottom: 0;
}

/* Variantes de largeur pour les lignes de texte */
.skeleton-title {
  width: 70%;
  height: 18px;
  margin-bottom: 8px;
}

.skeleton-subtitle {
  width: 50%;
  height: 14px;
}

/* Conteneur pour le contenu textuel */
.skeleton-content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* ==================== Skeleton Message (pour le chat) ==================== */

.skeleton-message.message-assistant {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-xl) 0;
  width: 100%;
  max-width: var(--chat-max-width);
  position: relative;
}

/* Avatar skeleton */
.skeleton-avatar {
  width: 48px;
  height: 48px;
  background: rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-md);
  flex-shrink: 0;
  position: relative;
  overflow: hidden;
}

.skeleton-avatar::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.4) 20%,
    rgba(255, 255, 255, 0.6) 50%,
    rgba(255, 255, 255, 0.4) 80%,
    transparent 100%
  );
  background-size: 468px 100%;
  background-attachment: fixed;
  animation: skeleton-shimmer 2s linear infinite;
  pointer-events: none;
}

/* Contenu du message skeleton */
.skeleton-message-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

/* Lignes de texte dans le message (largeurs variées) */
.skeleton-message-line {
  height: 18px;
  background: rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-sm);
  position: relative;
  overflow: hidden;
}

.skeleton-message-line::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.4) 20%,
    rgba(255, 255, 255, 0.6) 50%,
    rgba(255, 255, 255, 0.4) 80%,
    transparent 100%
  );
  background-size: 468px 100%;
  background-attachment: fixed;
  animation: skeleton-shimmer 2s linear infinite;
  pointer-events: none;
}

/* Variantes de largeur pour créer un effet naturel */
.skeleton-message-line:nth-child(1) {
  width: 100%;
}

.skeleton-message-line:nth-child(2) {
  width: 90%;
}

.skeleton-message-line:nth-child(3) {
  width: 60%;
}

/* ==================== Dark Mode ==================== */

[data-theme="dark"] .skeleton-card.history-conversation-card,
[data-theme="dark"] .skeleton-placeholder {
  background: var(--glass-bg);
  border-color: var(--glass-border);
}

[data-theme="dark"] .skeleton-circle,
[data-theme="dark"] .skeleton-text,
[data-theme="dark"] .skeleton-avatar,
[data-theme="dark"] .skeleton-message-line {
  background: rgba(255, 255, 255, 0.08);
}

/* Shimmer subtil en dark mode */
[data-theme="dark"] .skeleton-card::before,
[data-theme="dark"] .skeleton-shimmer::before,
[data-theme="dark"] .skeleton-avatar::before,
[data-theme="dark"] .skeleton-message-line::before {
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.05) 20%,
    rgba(255, 255, 255, 0.1) 50%,
    rgba(255, 255, 255, 0.05) 80%,
    transparent 100%
  );
}

/* ==================== Responsive Design ==================== */

@media (max-width: 768px) {
  .skeleton-card.history-conversation-card {
    padding: 12px 16px;
    min-height: 60px;
  }

  .skeleton-title {
    width: 80%;
    height: 16px;
  }

  .skeleton-subtitle {
    width: 60%;
    height: 12px;
  }

  .skeleton-message-line {
    height: 16px;
  }
}

/* ==================== Accessibility ==================== */

/* Screen readers */
.skeleton-loading[aria-busy="true"] {
  /* Announce loading state to screen readers */
}

.skeleton-loading[aria-label] {
  /* Use aria-label for meaningful description */
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  .skeleton-card::before,
  .skeleton-shimmer::before,
  .skeleton-avatar::before,
  .skeleton-message-line::before {
    animation: none;
    /* Fallback: static gradient */
    background: linear-gradient(
      90deg,
      transparent 0%,
      rgba(249, 228, 121, 0.1) 50%,
      transparent 100%
    );
  }
}

/* ==================== Utility Classes ==================== */

/* Opacité réduite pour effet fade (2 derniers skeleton cards) */
.skeleton-faded {
  opacity: 0.5;
}

/* Animation d'entrée smooth */
@keyframes skeleton-fade-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.skeleton-fade-in {
  animation: skeleton-fade-in 0.3s ease-out;
}

/* Animation de sortie smooth */
@keyframes skeleton-fade-out {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(-10px);
  }
}

.skeleton-fade-out {
  animation: skeleton-fade-out 0.3s ease-out forwards;
}