.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-secondary) 25%,
    var(--border-color) 50%,
    var(--bg-secondary) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 8px;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Skeleton variants */
.skeleton-text {
  height: 16px;
  margin-bottom: 8px;
}

.skeleton-title {
  height: 24px;
  width: 70%;
  margin-bottom: 12px;
}

.skeleton-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
}

.skeleton-card {
  background: var(--card-bg);
  border-radius: 16px;
  padding: var(--space-4);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.skeleton-book-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.skeleton-cover {
  width: 100%;
  aspect-ratio: 2/3;
  border-radius: 8px;
}