/* ============================================================
   library.css — Bibliothèque & Détail œuvre
   Kalamundi — La Plume du Monde
   Normes : BISAC (catégories), Dublin Core (métadonnées), Dewey 896 (Afrique)
   ============================================================ */

/* ============================================================
   EN-TÊTE BIBLIOTHÈQUE
   ============================================================ */

.lib-header {
  background: linear-gradient(160deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  padding-top: var(--spacing-xl);
  padding-bottom: 0;
  color: var(--text-inverse);
}

.lib-header__inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
  padding-bottom: var(--spacing-lg);
}

.lib-header__title {
  font-size: var(--font-size-2xl);
  color: var(--text-inverse);
  margin-bottom: var(--spacing-xs);
}

.lib-header__sub {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.65);
  letter-spacing: 0.03em;
}

.lib-header__search {
  flex: 0 1 420px;
}

.lib-header__search .search-bar {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.25);
}

.lib-header__search .search-bar__input {
  color: var(--text-inverse);
}

.lib-header__search .search-bar__input::placeholder {
  color: rgba(255,255,255,0.5);
}

/* ============================================================
   ONGLETS CATÉGORIES — classification BISAC
   ============================================================ */

.lib-tabs-bar {
  background: rgba(0,0,0,0.18);
  border-top: 1px solid rgba(255,255,255,0.08);
}

.lib-tabs {
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 0;
}

.lib-tabs::-webkit-scrollbar { display: none; }

.lib-tab {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 12px 18px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: rgba(255,255,255,0.65);
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  font-family: inherit;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.lib-tab:hover {
  color: rgba(255,255,255,0.9);
}

.lib-tab.is-active {
  color: var(--text-inverse);
  border-bottom-color: var(--color-accent);
  font-weight: var(--font-weight-bold);
}

.lib-tab--africa.is-active  { border-bottom-color: #FF8F00; }
.lib-tab--heritage.is-active { border-bottom-color: #A1887F; }

/* ============================================================
   BANNIÈRE DESCRIPTION CATÉGORIE
   ============================================================ */

.lib-cat-desc {
  padding: var(--spacing-sm) 0;
}

.lib-cat-banner {
  background: var(--bg-secondary);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-block: var(--spacing-sm);
}

.lib-cat-banner strong {
  color: var(--text-primary);
}

/* ============================================================
   RAYONNAGE — entrée façon vraie bibliothèque
   ============================================================ */

.library-shelves {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--spacing-sm);
  padding-block: var(--spacing-md);
  border-bottom: 10px solid rgba(83, 56, 32, 0.20);
  box-shadow: 0 18px 26px rgba(31, 38, 27, 0.08);
}

.library-shelf {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 88px;
  padding: var(--spacing-md);
  border-radius: var(--border-radius-md);
  color: #fff;
  text-decoration: none;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(0,0,0,0.22), transparent 34%),
    repeating-linear-gradient(90deg, #1B4332 0 18px, #2D6A4F 18px 36px, #A97C0E 36px 50px, #37474F 50px 66px);
  box-shadow: var(--shadow-sm);
}

.library-shelf::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 8px;
  background: rgba(42,27,15,0.55);
}

.library-shelf__label {
  position: relative;
  z-index: 1;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-md);
  text-shadow: 0 1px 8px rgba(0,0,0,0.45);
}

.library-shelf__hint {
  position: relative;
  z-index: 1;
  margin-top: 3px;
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.76);
}

.library-shelf--featured {
  background:
    linear-gradient(90deg, rgba(0,0,0,0.18), transparent 34%),
    repeating-linear-gradient(90deg, #184E77 0 18px, #1E6091 18px 34px, #2D6A4F 34px 52px, #A97C0E 52px 66px);
}

.library-shelf--heritage {
  background:
    linear-gradient(90deg, rgba(0,0,0,0.28), transparent 34%),
    repeating-linear-gradient(90deg, #4E342E 0 18px, #6D4C41 18px 36px, #795548 36px 54px, #37474F 54px 68px);
}

/* ============================================================
   LAYOUT PRINCIPAL
   ============================================================ */

.lib-layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--spacing-xl);
  padding-block: var(--spacing-lg);
  align-items: start;
}

/* ============================================================
   SIDEBAR FILTRES
   ============================================================ */

.lib-sidebar {
  position: sticky;
  top: 72px;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  scrollbar-width: thin;
  padding-right: var(--spacing-xs);
}

.lib-filter-group {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
}

.lib-filter-group:last-of-type {
  border-bottom: none;
}

.lib-filter-group__title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--spacing-sm);
}

.lib-filter-options {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.lib-radio {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 8px;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  transition: background-color var(--transition-fast), color var(--transition-fast);
  user-select: none;
}

.lib-radio input[type="radio"] {
  accent-color: var(--color-primary);
  flex-shrink: 0;
}

.lib-radio:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}

.lib-radio.is-active {
  background-color: var(--bg-secondary);
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
}

.lib-select {
  width: 100%;
  padding: 7px var(--spacing-sm);
  border: 1.5px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-sm);
  font-family: inherit;
  color: var(--text-primary);
  background-color: var(--bg-main);
  cursor: pointer;
  outline: none;
}

.lib-select:focus {
  border-color: var(--color-primary);
}

/* ============================================================
   TOOLBAR RÉSULTATS
   ============================================================ */

.lib-main {}

.lib-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--border-color);
}

.lib-count {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.lib-mobile-filter-btn {
  display: none;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: 6px 12px;
  font-size: var(--font-size-sm);
  font-family: inherit;
  cursor: pointer;
  color: var(--text-primary);
}

/* ============================================================
   FILTRES ACTIFS — chips
   ============================================================ */

.lib-active-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.active-filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  background-color: var(--color-primary);
  color: var(--text-inverse);
  border: none;
  border-radius: var(--border-radius-full);
  font-size: var(--font-size-xs);
  font-family: inherit;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.active-filter-chip:hover {
  background-color: var(--color-primary-dark);
}

/* ============================================================
   GRILLE LIVRES — layout façon bibliothèque (3 colonnes)
   ============================================================ */

.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(178px, 1fr));
  gap: 28px 18px;
  align-items: end;
  padding: 8px 0 26px;
  border-bottom: 12px solid rgba(91, 60, 35, 0.18);
  box-shadow: inset 0 -1px 0 rgba(255,255,255,0.6);
}

/* ============================================================
   CARTE LIVRE — notice bibliographique
   Dublin Core : titre, auteur, langue, genre, date, droits
   ============================================================ */

.book-card {
  display: flex;
  flex-direction: column;
  background:
    linear-gradient(90deg, rgba(0,0,0,0.035), transparent 18px),
    var(--bg-card);
  border: 1px solid rgba(52, 60, 47, 0.14);
  border-radius: 6px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: box-shadow var(--transition-normal), transform var(--transition-fast);
  cursor: pointer;
  box-shadow:
    0 14px 26px rgba(32,38,30,0.12),
    10px 0 18px rgba(52, 36, 21, 0.08);
  transform-origin: bottom center;
}

.book-card:hover {
  box-shadow:
    0 20px 38px rgba(32,38,30,0.18),
    14px 0 22px rgba(52, 36, 21, 0.10);
  transform: translateY(-6px) rotateZ(-0.5deg);
}

.book-card--original {
  border-color: color-mix(in srgb, var(--color-primary) 35%, var(--border-color));
}

/* Couverture — ratio 2:3 comme un vrai livre */
.book-card__cover {
  position: relative;
  aspect-ratio: 2 / 3;
  background: linear-gradient(
    160deg,
    var(--genre-color, var(--color-primary)) 0%,
    color-mix(in srgb, var(--genre-color, var(--color-primary)) 60%, #000) 100%
  );
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
  border-left: 8px solid rgba(0,0,0,0.22);
  box-shadow:
    inset 10px 0 12px rgba(0,0,0,0.18),
    inset -1px 0 0 rgba(255,255,255,0.26);
}

.book-card__cover::after {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(0,0,0,0.20), transparent 14%, transparent 86%, rgba(255,255,255,0.16)),
    linear-gradient(180deg, rgba(255,255,255,0.18), transparent 32%, rgba(0,0,0,0.10));
  mix-blend-mode: soft-light;
}

.book-card__cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.book-card__cover-icon {
  font-size: 2.8rem;
  opacity: 0.35;
  user-select: none;
}

/* Badges superposés sur la couverture */
.book-card__cover-badges {
  position: absolute;
  top: var(--spacing-xs);
  left: var(--spacing-xs);
  display: flex;
  flex-direction: column;
  gap: 3px;
}

/* Corps notice bibliographique */
.book-card__body {
  padding: var(--spacing-sm) var(--spacing-md) var(--spacing-md);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

/* Genre (BISAC) */
.book-card__genre {
  font-size: 10px;
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: 2px;
}

/* Titre (dc:title) */
.book-card__title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin: 0;
}

/* Auteur + pays (dc:creator) */
.book-card__author {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  line-height: 1.4;
}

.book-card__pays {
  color: var(--text-light);
}

/* Résumé (dc:description) */
.book-card__resume {
  font-size: var(--font-size-xs);
  color: var(--text-light);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin: 2px 0 0;
  flex: 1;
}

/* Métadonnées en bas (dc:language, lectures, note, date) */
.book-card__meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 10px;
  color: var(--text-light);
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: var(--spacing-xs);
  border-top: 1px solid var(--border-color);
}

/* Langue ISO (dc:language) — mise en valeur */
.book-card__langue {
  font-weight: var(--font-weight-bold);
  color: var(--text-secondary);
  background-color: var(--bg-secondary);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 10px;
}

.book-card__annee {
  color: var(--text-light);
  margin-left: auto;
}

/* ============================================================
   BADGES sur couverture
   ============================================================ */

.book-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: var(--font-weight-bold);
  padding: 2px 6px;
  border-radius: 3px;
  line-height: 1.4;
  white-space: nowrap;
}

.book-badge--free {
  background: rgba(45, 158, 95, 0.9);
  color: #fff;
}

.book-badge--premium {
  background: rgba(212, 160, 23, 0.95);
  color: #1A1A1A;
}

.book-badge--africa {
  background: rgba(230, 81, 0, 0.9);
  color: #fff;
  font-size: 9px;
}

.book-badge--import {
  background: rgba(65, 48, 39, 0.9);
  color: #fff;
}

/* ============================================================
   PAGINATION
   ============================================================ */

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding-block: var(--spacing-xl);
  flex-wrap: wrap;
}

.pagination__btn {
  min-width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-sm);
  font-family: inherit;
  color: var(--text-secondary);
  background: var(--bg-main);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.pagination__btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.pagination__btn--active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--text-inverse);
  font-weight: var(--font-weight-bold);
  cursor: default;
}

.pagination__ellipsis {
  color: var(--text-light);
  padding: 0 4px;
}

/* ============================================================
   PAGE DÉTAIL ŒUVRE (work.html) — inchangé
   ============================================================ */

.work-hero {
  background-color: var(--color-primary-dark);
  color: var(--text-inverse);
  padding-block: var(--spacing-xl);
}

.work-hero__inner {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: var(--spacing-xl);
  align-items: start;
  max-width: var(--container-lg);
  margin-inline: auto;
  padding-inline: var(--spacing-md);
}

.work-cover {
  width: 180px;
  aspect-ratio: 2 / 3;
  border-radius: var(--border-radius-md);
  object-fit: cover;
  box-shadow: var(--shadow-lg);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 56px;
  color: rgba(255,255,255,0.3);
  flex-shrink: 0;
  overflow: hidden;
}

.work-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--border-radius-md);
}

.work-info__genre {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent-light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--spacing-sm);
}

.work-info__title {
  font-size: clamp(var(--font-size-xl), 4vw, var(--font-size-3xl));
  color: var(--text-inverse);
  margin-bottom: var(--spacing-sm);
}

.work-info__author {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.75);
}

.work-info__author a { color: var(--color-accent-light); }

.work-info__stats {
  display: flex;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.work-stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.work-stat__value {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-inverse);
}

.work-stat__label {
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.55);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.work-info__actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.work-body {
  max-width: var(--container-lg);
  margin-inline: auto;
  padding: var(--spacing-xl) var(--spacing-md);
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--spacing-xl);
  align-items: start;
}

.work-resume {
  font-size: var(--font-size-md);
  color: var(--text-secondary);
  line-height: var(--line-height-loose);
  margin-bottom: var(--spacing-xl);
  white-space: pre-line;
}

.work-chapitres { margin-bottom: var(--spacing-xl); }

.chapitre-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-color);
  margin-bottom: var(--spacing-sm);
  text-decoration: none;
  color: inherit;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.chapitre-item:hover {
  background-color: var(--bg-secondary);
  border-color: var(--color-primary);
}

.chapitre-item__num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  flex-shrink: 0;
}

.chapitre-item__titre {
  flex: 1;
  font-size: var(--font-size-sm);
  color: var(--text-primary);
}

.work-sidebar-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  position: sticky;
  top: 80px;
}

.work-sidebar-card__title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
}

.author-mini {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  text-decoration: none;
  color: inherit;
}

.author-mini__nom {
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-sm);
  color: var(--text-primary);
}

.author-mini__pays {
  font-size: var(--font-size-xs);
  color: var(--text-light);
}

.work-report {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

.comments-section { margin-top: var(--spacing-xl); }

.comment-item {
  display: flex;
  gap: var(--spacing-md);
  padding-block: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
}

.comment-item__body { flex: 1; }

.comment-item__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-xs);
}

.comment-item__nom {
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-sm);
}

.comment-item__date {
  font-size: var(--font-size-xs);
  color: var(--text-light);
}

.comment-item__texte {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: var(--line-height-normal);
}

.comment-reply-btn {
  border: none;
  background: transparent;
  color: var(--color-primary);
  font: inherit;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  padding: 0;
  cursor: pointer;
}

.comment-replies {
  margin-top: var(--spacing-sm);
  padding-left: var(--spacing-md);
  border-left: 2px solid var(--border-color);
}

.comment-reply {
  padding: var(--spacing-sm) 0;
}

.reply-target {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
  padding: 6px 10px;
  border-radius: var(--border-radius-sm);
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
}

.reply-target button {
  border: none;
  background: transparent;
  color: var(--color-primary);
  cursor: pointer;
  font: inherit;
  font-weight: var(--font-weight-medium);
}

.comment-form {
  background-color: var(--bg-secondary);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.star-rating {
  display: flex;
  gap: 4px;
  margin-bottom: var(--spacing-md);
}

.star-rating__star {
  font-size: 24px;
  cursor: pointer;
  color: var(--border-color);
  transition: color var(--transition-fast);
  background: none;
  border: none;
  padding: 0;
  line-height: 1;
}

.star-rating__star.is-active,
.star-rating__star:hover { color: var(--color-accent); }

/* ============================================================
   RESPONSIVE
   ============================================================ */

/* Tablette : 2 colonnes livres */
@media (max-width: 1024px) {
  .library-shelves { grid-template-columns: repeat(3, 1fr); }
  .books-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .lib-layout  { grid-template-columns: 180px 1fr; }
}

/* Tablette portrait */
@media (max-width: 768px) {
  .library-shelves { grid-template-columns: repeat(2, 1fr); }

  .lib-layout { grid-template-columns: 1fr; }

  .lib-sidebar {
    display: none;
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    background: var(--bg-main);
    padding: var(--spacing-lg);
    overflow-y: auto;
    max-height: 100vh;
    top: unset;
  }

  .lib-sidebar.is-open { display: block; }

  .lib-mobile-filter-btn { display: inline-flex; }

  .lib-header__inner { flex-direction: column; align-items: flex-start; }
  .lib-header__search { flex: 1; width: 100%; }

  /* 2 colonnes livres sur mobile large */
  .books-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--spacing-sm); }

  .work-body { grid-template-columns: 1fr; }
  .work-sidebar-card { position: static; }
  .work-hero__inner { grid-template-columns: 100px 1fr; gap: var(--spacing-md); }
  .work-cover { width: 100px; }
}

/* Mobile petit : 1 colonne livres */
@media (max-width: 400px) {
  .library-shelves { grid-template-columns: 1fr; }
  .books-grid { grid-template-columns: repeat(2, 1fr); }
  .book-card__resume { display: none; }
}