/* Раздел «Книги» в библиотеке знаний. Отдельный файл, чтобы не трогать общий
   styles.css: он большой, и правки в нём тяжело переживают слияния веток. */

.kb-book-crumbs {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--color-text-muted, #64748b);
  margin: 4px 0 12px;
}
.kb-book-crumbs button {
  border: 0;
  background: transparent;
  color: var(--color-primary, #6d28d9);
  font: inherit;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 6px;
}
.kb-book-crumbs button:hover { background: var(--color-primary-soft-bg, rgba(109, 40, 217, .08)); }

.kb-book-folders {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 8px;
  margin-bottom: 16px;
}
.kb-book-folder {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  text-align: left;
  border: 1px solid var(--color-border, #e2e8f0);
  border-radius: 10px;
  background: var(--color-bg-card, #fff);
  color: inherit;
  font: inherit;
  padding: 10px 12px;
  cursor: pointer;
}
.kb-book-folder:hover { border-color: var(--color-primary, #6d28d9); }
.kb-book-folder-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.kb-book-folder-count { font-size: 12px; color: var(--color-text-muted, #64748b); }
.kb-book-folder-menu {
  opacity: 0;
  font-size: 12px;
  padding: 2px 4px;
  border-radius: 6px;
}
.kb-book-folder:hover .kb-book-folder-menu { opacity: .7; }
.kb-book-folder-menu:hover { opacity: 1; background: var(--color-bg-hover, #f1f5f9); }

.kb-books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 16px;
}

.kb-book-card { position: relative; display: flex; flex-direction: column; gap: 8px; }

.kb-book-cover {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 3 / 4;
  border-radius: 8px;
  overflow: hidden;
  background: var(--color-bg-secondary, #f1f5f9);
  box-shadow: 0 2px 10px rgba(15, 23, 42, .14);
  text-decoration: none;
}
.kb-book-cover img { width: 100%; height: 100%; object-fit: cover; }
.kb-book-cover-fallback { font-size: 38px; }

.kb-book-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 4px;
  background: rgba(15, 23, 42, .18);
}
.kb-book-progress i { display: block; height: 100%; background: var(--color-primary, #6d28d9); }

.kb-book-meta { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.kb-book-title {
  font-size: 13px;
  font-weight: 600;
  color: inherit;
  text-decoration: none;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.kb-book-title:hover { color: var(--color-primary, #6d28d9); }
.kb-book-author, .kb-book-sub { font-size: 11px; color: var(--color-text-muted, #64748b); }

.kb-book-actions {
  position: absolute;
  top: 6px;
  right: 6px;
  display: flex;
  gap: 2px;
  opacity: 0;
  background: var(--color-bg-card, #fff);
  border-radius: 8px;
  padding: 2px;
  box-shadow: 0 2px 8px rgba(15, 23, 42, .18);
  transition: opacity .15s ease;
}
.kb-book-card:hover .kb-book-actions, .kb-book-actions:focus-within { opacity: 1; }
.kb-book-actions button {
  border: 0;
  background: transparent;
  color: inherit;
  font-size: 12px;
  cursor: pointer;
  padding: 3px 5px;
  border-radius: 6px;
}
.kb-book-actions button:hover { background: var(--color-bg-hover, #f1f5f9); }

.kb-book-upload-btn { cursor: pointer; }

.kb-book-uploads { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.kb-book-upload {
  position: relative;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 12px;
  padding: 8px 10px;
  border-radius: 8px;
  background: var(--color-bg-secondary, #f1f5f9);
  overflow: hidden;
}
.kb-book-upload span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.kb-book-upload i {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  background: var(--color-primary, #6d28d9);
}
.kb-book-upload.is-error { background: rgba(239, 68, 68, .12); }
.kb-book-upload.is-error i { background: var(--color-danger, #ef4444); }

/* На телефоне обложки мельче: иначе в ряд влезает одна книга */
@media (max-width: 640px) {
  .kb-books-grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: 12px; }
  .kb-book-actions { opacity: 1; }
}

/* Свой тост: хелперы knowledge.js закрыты в его IIFE и отсюда недоступны. */
.kb-book-toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  z-index: 2000;
  background: rgba(15, 23, 42, .92);
  color: #fff;
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 14px;
}
.kb-book-toast.mfc-toast-error { background: #b91c1c; }