/* ==========================================================================
   BIBLIOTECA DIGITAL ESPECIALIZADA - HOJA DE ESTILOS PRINCIPAL
   ========================================================================== */

:root {
  /* Paleta Claro (Clásica & Editorial) */
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-surface: #ffffff;
  --bg-modal: #ffffff;
  --bg-overlay: rgba(15, 23, 42, 0.75);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;

  --accent-primary: #0d5c3a;
  --accent-primary-hover: #083c25;
  --accent-secondary: #c25e00;
  --accent-light: #e8f5e9;
  --accent-amber-light: #fffbeb;

  --border-color: #e2e8f0;
  --border-subtle: #f1f5f9;
  --border-focus: #0d5c3a;

  --badge-bg: #ecfdf5;
  --badge-text: #065f46;
  --badge-border: #a7f3d0;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
  --shadow-book: 0 12px 24px -6px rgba(15, 23, 42, 0.15), 0 4px 8px -2px rgba(15, 23, 42, 0.1);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-primary: #090d16;
  --bg-secondary: #0f172a;
  --bg-card: #131d31;
  --bg-surface: #1e293b;
  --bg-modal: #131d31;
  --bg-overlay: rgba(3, 7, 18, 0.88);

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --text-inverse: #0f172a;

  --accent-primary: #10b981;
  --accent-primary-hover: #34d399;
  --accent-secondary: #f59e0b;
  --accent-light: rgba(16, 185, 129, 0.12);
  --accent-amber-light: rgba(245, 158, 11, 0.12);

  --border-color: #1e293b;
  --border-subtle: #131d31;
  --border-focus: #10b981;

  --badge-bg: rgba(16, 185, 129, 0.15);
  --badge-text: #6ee7b7;
  --badge-border: rgba(16, 185, 129, 0.3);

  --shadow-book: 0 14px 28px -6px rgba(0, 0, 0, 0.5), 0 6px 12px -2px rgba(0, 0, 0, 0.4);
}

/* Base & Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.6;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--transition-normal), color var(--transition-normal);
  background-image: 
    radial-gradient(at 0% 0%, rgba(13, 92, 58, 0.03) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(194, 94, 0, 0.03) 0px, transparent 50%);
}

.container {
  width: 100%;
  max-width: 1320px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Material Symbols icon helper */
.material-symbols-outlined {
  font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
  vertical-align: middle;
  line-height: 1;
}

/* ==========================================================================
   HEADER PRINCIPAL
   ========================================================================== */
.site-header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: all var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  gap: 1.5rem;
}

.brand-area {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--accent-primary), #064e3b);
  color: white;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(13, 92, 58, 0.25);
}

.brand-icon .material-symbols-outlined {
  font-size: 28px;
}

.brand-titles h1 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  line-height: 1.2;
}

.brand-titles p {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle-btn,
.stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  background: var(--accent-light);
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

.stat-pill {
  cursor: default;
  background: var(--accent-light);
  color: var(--accent-primary);
  border-color: var(--badge-border);
}

/* ==========================================================================
   HERO / BANNER DE INTRODUCCIÓN
   ========================================================================== */
.hero-section {
  padding: 2.75rem 0 1.5rem;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  background: var(--accent-light);
  color: var(--accent-primary);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
  border: 1px solid var(--badge-border);
}

.hero-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 2.4rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--text-primary);
  max-width: 820px;
  margin: 0 auto 0.75rem;
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
}

/* ==========================================================================
   BARRA DE HERRAMIENTAS: BÚSQUEDA Y FILTROS
   ========================================================================== */
.toolbar-section {
  padding: 1.5rem 0 1rem;
  position: sticky;
  top: 73px;
  z-index: 30;
  background: rgba(248, 250, 252, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2rem;
}

[data-theme="dark"] .toolbar-section {
  background: rgba(9, 13, 22, 0.92);
}

.search-and-controls {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.search-row {
  display: flex;
  gap: 1rem;
  align-items: center;
  width: 100%;
}

.search-box {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 1.1rem;
  color: var(--text-muted);
  pointer-events: none;
  font-size: 22px;
}

.search-input {
  width: 100%;
  padding: 0.85rem 2.8rem 0.85rem 3rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  font-size: 0.95rem;
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  outline: none;
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.search-clear-btn {
  position: absolute;
  right: 1rem;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  display: none;
  padding: 4px;
  border-radius: 50%;
  transition: color var(--transition-fast);
}

.search-clear-btn:hover {
  color: var(--text-primary);
}

.search-clear-btn.visible {
  display: flex;
  align-items: center;
  justify-content: center;
}

.view-toggles {
  display: flex;
  background: var(--bg-card);
  padding: 3px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.view-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0.75rem;
  background: transparent;
  border: none;
  border-radius: calc(var(--radius-md) - 4px);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.view-btn.active {
  background: var(--accent-primary);
  color: white;
  box-shadow: var(--shadow-sm);
}

/* Categorías Tabs */
.categories-scroll {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding: 0.25rem 0 0.5rem;
  scrollbar-width: thin;
}

.categories-scroll::-webkit-scrollbar {
  height: 4px;
}

.categories-scroll::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

.category-tab {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
}

.category-tab .material-symbols-outlined {
  font-size: 18px;
}

.category-tab .tab-count {
  font-size: 0.75rem;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-full);
  background: var(--bg-secondary);
  color: var(--text-muted);
}

.category-tab:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: var(--accent-light);
}

.category-tab.active {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
  box-shadow: 0 4px 10px rgba(13, 92, 58, 0.25);
}

.category-tab.active .tab-count {
  background: rgba(255, 255, 255, 0.25);
  color: white;
}

/* Información de resultados */
.results-info-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding: 0 0.5rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.results-info-bar strong {
  color: var(--text-primary);
}

/* ==========================================================================
   GRID DE LIBROS
   ========================================================================== */
.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.75rem;
  margin-bottom: 3.5rem;
}

/* Tarjeta individual de Libro */
.book-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  cursor: pointer;
  position: relative;
}

.book-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-book);
  border-color: var(--accent-primary);
}

.book-cover-container {
  position: relative;
  aspect-ratio: 3/4;
  background: linear-gradient(135deg, #1e293b, #0f172a);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}

.book-cover-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 4px;
  filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.35));
  transition: transform var(--transition-normal);
}

.book-card:hover .book-cover-img {
  transform: scale(1.04);
}

.book-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(15, 23, 42, 0.85);
  color: #a7f3d0;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.15);
  z-index: 2;
}

.book-content {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.book-category-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}

.book-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.book-author {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.book-author .material-symbols-outlined {
  font-size: 16px;
  color: var(--accent-primary);
}

.book-synopsis-snippet {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.book-footer-btn {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.65rem 1rem;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  color: var(--accent-primary);
  font-size: 0.85rem;
  font-weight: 700;
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.book-card:hover .book-footer-btn {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
}

.book-footer-btn .material-symbols-outlined {
  font-size: 18px;
  transition: transform var(--transition-fast);
}

.book-card:hover .book-footer-btn .material-symbols-outlined {
  transform: translateX(3px);
}

/* ==========================================================================
   VISTA EN LISTA (COMPACTA)
   ========================================================================== */
.books-grid.list-view {
  grid-template-columns: 1fr;
  gap: 1rem;
}

.books-grid.list-view .book-card {
  flex-direction: row;
  height: auto;
  align-items: stretch;
}

.books-grid.list-view .book-cover-container {
  width: 140px;
  min-width: 140px;
  aspect-ratio: auto;
  padding: 0.75rem;
}

.books-grid.list-view .book-content {
  padding: 1.25rem 1.5rem;
  justify-content: center;
}

.books-grid.list-view .book-title {
  -webkit-line-clamp: 1;
  font-size: 1.2rem;
}

.books-grid.list-view .book-footer-btn {
  align-self: flex-start;
  margin-top: 0.5rem;
}

/* ==========================================================================
   ESTADO VACÍO (SIN RESULTADOS)
   ========================================================================== */
.empty-state {
  text-align: center;
  padding: 4rem 1.5rem;
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  border: 1px dashed var(--border-color);
  margin-bottom: 3rem;
  display: none;
}

.empty-state.visible {
  display: block;
}

.empty-icon {
  font-size: 54px;
  color: var(--accent-secondary);
  margin-bottom: 1rem;
}

.empty-state h3 {
  font-family: 'Playfair Display', serif;
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.empty-state p {
  color: var(--text-muted);
  max-width: 420px;
  margin: 0 auto 1.5rem;
}

.btn-reset-filters {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-full);
  background: var(--accent-primary);
  color: white;
  border: none;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.btn-reset-filters:hover {
  background: var(--accent-primary-hover);
}

/* ==========================================================================
   MODAL DE DETALLE Y TEMAS PRINCIPALES
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-container {
  background: var(--bg-modal);
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-color);
  max-width: 960px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-container {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.75rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.modal-header-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.8rem;
  border-radius: var(--radius-full);
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.modal-close-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background: #fee2e2;
  color: #dc2626;
  border-color: #fca5a5;
  transform: rotate(90deg);
}

.modal-body {
  padding: 2rem;
  overflow-y: auto;
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 2.25rem;
}

.modal-cover-side {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.modal-cover-wrapper {
  background: linear-gradient(145deg, #1e293b, #0f172a);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  aspect-ratio: 3/4;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-book);
}

.modal-cover-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 6px;
  filter: drop-shadow(0 12px 20px rgba(0, 0, 0, 0.4));
}

.modal-meta-box {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 1rem;
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.85rem;
}

.meta-item {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
}

.meta-label {
  color: var(--text-muted);
  font-weight: 500;
}

.meta-value {
  color: var(--text-primary);
  font-weight: 600;
  text-align: right;
}

.modal-info-side {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.modal-book-title {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.85rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--text-primary);
}

.modal-book-author {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent-primary);
}

.modal-section-title {
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.5rem;
}

.modal-synopsis {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--accent-primary);
}

/* Temas Principales Lista */
.modal-topics-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.modal-topic-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.92rem;
  color: var(--text-primary);
  line-height: 1.5;
  padding: 0.5rem 0.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.modal-topic-item:hover {
  border-color: var(--accent-primary);
  transform: translateX(4px);
}

.topic-bullet-icon {
  color: var(--accent-primary);
  font-size: 20px;
  flex-shrink: 0;
  margin-top: 1px;
}

.modal-footer {
  padding: 1rem 1.75rem;
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.btn-nav-book,
.btn-action-copy {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-nav-book:hover,
.btn-action-copy:hover {
  background: var(--accent-light);
  color: var(--accent-primary);
  border-color: var(--accent-primary);
}

.modal-nav-group {
  display: flex;
  gap: 0.5rem;
}

/* ==========================================================================
   TOAST NOTIFICACIONES
   ========================================================================== */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 200;
  pointer-events: none;
}

.toast {
  background: var(--text-primary);
  color: var(--text-inverse);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  opacity: 0;
  transform: translateY(12px);
  transition: all var(--transition-normal);
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
  padding: 2.5rem 0;
  text-align: center;
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.footer-brand {
  font-family: 'Playfair Display', serif;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* ==========================================================================
   RESPONSIVIDAD
   ========================================================================== */
@media (max-width: 900px) {
  .modal-body {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .modal-cover-wrapper {
    max-width: 240px;
    margin: 0 auto;
  }

  .hero-title {
    font-size: 1.9rem;
  }
}

@media (max-width: 640px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-actions {
    align-self: flex-end;
  }

  .books-grid {
    grid-template-columns: 1fr;
  }

  .books-grid.list-view .book-card {
    flex-direction: column;
  }

  .books-grid.list-view .book-cover-container {
    width: 100%;
    aspect-ratio: 3/4;
  }

  .modal-footer {
    flex-direction: column;
    align-items: stretch;
  }

  .modal-nav-group {
    justify-content: space-between;
  }
}


/* ==========================================================================
   MEJORAS UNIFICADAS: LIBRO 3D, FILTROS DE ÁREA, CITAS, GESTIÓN Y PORTADAS
   ========================================================================== */

.btn-primary-action {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  border: 1px solid var(--accent-primary);
  background: var(--accent-primary);
  color: #ffffff;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(13, 92, 58, 0.25);
  transition: all var(--transition-fast);
}

.btn-primary-action:hover {
  background: var(--accent-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(13, 92, 58, 0.35);
}

.btn-secondary-action {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-secondary-action:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: var(--accent-light);
}

/* Píldoras de Departamento / Gran Área en el Hero */
.department-pills {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
  padding: 0.35rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
}

.dept-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.dept-pill .material-symbols-outlined {
  font-size: 18px;
}

.dept-pill:hover {
  color: var(--accent-primary);
  background: var(--accent-light);
}

.dept-pill.active {
  background: var(--accent-primary);
  color: #ffffff;
  box-shadow: var(--shadow-sm);
}

/* Selector de ordenamiento */
.sort-box {
  display: flex;
  align-items: center;
}

.sort-select {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition-fast);
}

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

/* Efecto de Libro 3D con Lomo Realista (Inspirado en Carpeta 2) */
.book-3d-frame {
  position: relative;
  height: 100%;
  max-width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px 8px 8px 4px;
  overflow: hidden;
  box-shadow: 
    -4px 0 8px rgba(0, 0, 0, 0.35),
    0 12px 24px -4px rgba(0, 0, 0, 0.45),
    4px 0 0 rgba(255, 255, 255, 0.15);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.book-card:hover .book-3d-frame {
  transform: perspective(800px) rotateY(-4deg) scale(1.04);
  box-shadow: 
    -6px 4px 12px rgba(0, 0, 0, 0.45),
    0 18px 30px -6px rgba(0, 0, 0, 0.55),
    5px 0 0 rgba(255, 255, 255, 0.25);
}

.book-spine-effect {
  position: absolute;
  inset: 0 auto 0 0;
  width: 14px;
  background: linear-gradient(
    90deg,
    rgba(0, 0, 0, 0.55) 0%,
    rgba(255, 255, 255, 0.28) 22%,
    rgba(0, 0, 0, 0.32) 48%,
    rgba(255, 255, 255, 0.12) 75%,
    transparent 100%
  );
  z-index: 3;
  pointer-events: none;
}

.book-3d-frame .book-cover-img,
.book-3d-frame .modal-cover-img {
  border-radius: 3px 7px 7px 3px;
  filter: none;
  display: block;
}

/* Botón flotante para editar/mejorar portada en la tarjeta */
.card-quick-edit-btn {
  position: absolute;
  bottom: 0.85rem;
  right: 0.85rem;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: rgba(15, 23, 42, 0.88);
  color: #fbbf24;
  border: 1px solid rgba(251, 191, 36, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 4;
  opacity: 0;
  transform: translateY(4px);
  transition: all var(--transition-fast);
  backdrop-filter: blur(6px);
}

.book-card:hover .card-quick-edit-btn {
  opacity: 1;
  transform: translateY(0);
}

.card-quick-edit-btn:hover {
  background: #d97706;
  color: #ffffff;
  border-color: #f59e0b;
}

/* Elementos adicionales en el Modal de Detalle */
.modal-header-left {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.modal-header-subtag {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
}

.modal-header-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.btn-modal-edit {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-modal-edit:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  background: var(--accent-light);
}

.modal-book-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 0.35rem;
}

.modal-quote-box {
  position: relative;
  padding: 1rem 1.25rem 1rem 2.75rem;
  border-radius: var(--radius-md);
  background: var(--accent-amber-light);
  border-left: 4px solid var(--accent-secondary);
  color: var(--text-primary);
  font-family: 'Playfair Display', Georgia, serif;
  font-style: italic;
  font-size: 0.96rem;
  line-height: 1.55;
}

.quote-icon {
  position: absolute;
  left: 0.75rem;
  top: 0.85rem;
  color: var(--accent-secondary);
  font-size: 24px;
}

.modal-links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 0.65rem;
}

.modal-reading-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  text-decoration: none;
  font-size: 0.84rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.modal-reading-link:hover {
  border-color: var(--accent-primary);
  background: var(--accent-light);
  color: var(--accent-primary);
}

.modal-footer-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-action-delete {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-action-delete:hover {
  background: #fee2e2;
  color: #dc2626;
  border-color: #fca5a5;
}

/* ==========================================================================
   MODAL DE CARGA / EDICIÓN DE LIBROS Y ESTUDIO DE PORTADA
   ========================================================================== */

.form-modal-container {
  max-width: 1020px;
}

.form-modal-heading {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.book-form-body {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex: 1;
}

.form-grid-layout {
  padding: 1.5rem 1.75rem;
  overflow-y: auto;
  display: grid;
  grid-template-columns: 290px 1fr;
  gap: 1.75rem;
}

.form-cover-column {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.cover-studio-preview {
  background: linear-gradient(145deg, #1e293b, #0f172a);
  border-radius: var(--radius-lg);
  padding: 1rem;
  aspect-ratio: 3/4;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
}

.preview-3d {
  max-height: 100%;
  max-width: 100%;
}

#form-cover-preview {
  max-width: 100%;
  max-height: 280px;
  object-fit: contain;
  display: block;
}

.cover-upload-actions {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.btn-upload-cover {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius-md);
  background: var(--accent-light);
  color: var(--accent-primary);
  border: 1px dashed var(--accent-primary);
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-upload-cover:hover {
  background: var(--accent-primary);
  color: #ffffff;
}

.cover-enhancer-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.enhancer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-secondary);
}

.rotate-btns {
  display: flex;
  gap: 0.25rem;
}

.btn-icon-small {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-icon-small .material-symbols-outlined {
  font-size: 17px;
}

.btn-icon-small:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.slider-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.slider-row input[type="range"] {
  flex: 1;
  accent-color: var(--accent-primary);
}

.form-fields-column {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.form-row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
}

.form-row-3 {
  display: grid;
  grid-template-columns: 1.2fr 1.2fr 0.8fr;
  gap: 0.9rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.form-label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input-sm {
  padding: 0.45rem 0.7rem;
  font-size: 0.8rem;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.new-category-inline {
  padding: 0.85rem;
  border-radius: var(--radius-md);
  background: var(--accent-light);
  border: 1px dashed var(--accent-primary);
}

.form-footer-note {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Modal de Servidor / Exportación */
.server-modal-container {
  max-width: 680px;
}

.server-modal-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.server-intro {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.server-steps-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.server-step-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.step-badge {
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
}

.server-step-card h4 {
  font-size: 1.05rem;
  color: var(--text-primary);
}

.server-step-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

@media (max-width: 900px) {
  .form-grid-layout {
    grid-template-columns: 1fr;
  }
  .form-row-2,
  .form-row-3,
  .server-steps-grid {
    grid-template-columns: 1fr;
  }
  .hide-mobile {
    display: none;
  }
}