/**
 * Booklet Layout & Deck Presentation Styles
 * Proyecto Educativo del Programa (PEP) - Administración de Empresas
 * Universidad Libre Seccional Cartagena
 */

/* ==========================================================================
   Header & Brand Banner
   ========================================================================== */
.booklet-header {
  position: relative;
  width: 100%;
  background: linear-gradient(135deg, var(--color-unilibre-red-dark) 0%, var(--color-unilibre-red) 70%, var(--color-unilibre-red-deep) 100%);
  color: var(--color-unilibre-white);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  z-index: 100;
  border-bottom: 3px solid var(--color-unilibre-gold);
}

.header-inner {
  max-width: var(--booklet-max-width);
  margin: 0 auto;
  padding: var(--space-sm) var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  text-decoration: none;
  color: var(--color-unilibre-white);
}

.header-crest {
  width: 52px;
  height: 52px;
  object-fit: contain;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.25));
  transition: transform var(--transition-fast);
}

.header-crest:hover {
  transform: scale(1.05);
}

.header-titles {
  display: flex;
  flex-direction: column;
}

.header-institution {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-unilibre-gold-light);
}

.header-program {
  font-size: 1.15rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--color-unilibre-white);
}

.header-campus {
  font-size: 0.8rem;
  font-weight: 500;
  opacity: 0.9;
  display: flex;
  align-items: center;
  gap: 6px;
}

.header-campus-badge {
  display: inline-block;
  background-color: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.35);
  padding: 1px 8px;
  border-radius: var(--radius-pill);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* TOC Toggle Button */
.btn-toc-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.15);
  color: var(--color-unilibre-white);
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 8px 14px;
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  backdrop-filter: blur(4px);
}

.btn-toc-toggle:hover,
.btn-toc-toggle:focus-visible {
  background: var(--color-unilibre-white);
  color: var(--color-unilibre-red-dark);
  border-color: var(--color-unilibre-white);
  transform: translateY(-1px);
}

.btn-toc-toggle .toc-icon {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* ==========================================================================
   Reading Progress Bar
   ========================================================================== */
#reading-progress,
.reading-progress {
  width: 100%;
  height: 5px;
  background-color: rgba(0, 0, 0, 0.12);
  position: relative;
  overflow: hidden;
}

#reading-progress-bar,
.reading-progress-fill {
  height: 100%;
  width: 12.5%; /* Page 1 of 8 = 12.5% */
  background: linear-gradient(90deg, var(--color-unilibre-gold) 0%, var(--color-unilibre-gold-light) 100%);
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 0 8px rgba(191, 155, 52, 0.5);
}

/* ==========================================================================
   Table of Contents (TOC) Drawer
   ========================================================================== */
.toc-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(1, 1, 1, 0.5);
  backdrop-filter: blur(3px);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.toc-overlay.open {
  opacity: 1;
  visibility: visible;
}

#toc-drawer,
.toc-drawer {
  position: fixed;
  top: 0;
  right: -380px;
  width: 360px;
  max-width: 90vw;
  height: 100vh;
  background-color: var(--color-unilibre-white);
  box-shadow: -8px 0 32px rgba(0, 0, 0, 0.2);
  z-index: 1001;
  display: flex;
  flex-direction: column;
  transition: right 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  overflow-y: auto;
}

.toc-drawer.open {
  right: 0;
}

.toc-drawer-header {
  padding: var(--space-lg);
  background: linear-gradient(135deg, var(--color-unilibre-red-dark) 0%, var(--color-unilibre-red) 100%);
  color: var(--color-unilibre-white);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 3px solid var(--color-unilibre-gold);
}

.toc-title {
  font-size: 1.15rem;
  font-weight: 800;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-close-toc {
  background: transparent;
  border: none;
  color: var(--color-unilibre-white);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.btn-close-toc:hover {
  background-color: rgba(255, 255, 255, 0.2);
}

.toc-list {
  list-style: none;
  padding: var(--space-md) 0;
  margin: 0;
}

.toc-item {
  border-bottom: 1px solid var(--color-border-light);
}

.toc-link {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  color: var(--color-text-main);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
  transition: all var(--transition-fast);
  cursor: pointer;
  border-left: 4px solid transparent;
}

.toc-link:hover,
.toc-item.active .toc-link,
.toc-link.active {
  background-color: var(--color-unilibre-bg-light);
  color: var(--color-unilibre-red);
  border-left-color: var(--color-unilibre-red);
  padding-left: calc(var(--space-lg) + 4px);
}

.toc-page-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-circle);
  background-color: var(--color-unilibre-gray-light);
  color: var(--color-unilibre-gray-dark);
  font-size: 0.78rem;
  font-weight: 700;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.toc-item.active .toc-page-num,
.toc-link:hover .toc-page-num {
  background-color: var(--color-unilibre-red);
  color: var(--color-unilibre-white);
}

.toc-meta {
  display: flex;
  flex-direction: column;
}

.toc-meta-subtitle {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Booklet Deck Container & Book Simulation
   ========================================================================== */
.booklet-main-container {
  width: 100%;
  max-width: var(--booklet-max-width);
  margin: var(--space-lg) auto;
  padding: 0 var(--space-md);
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
}

#booklet-deck,
.booklet-deck {
  position: relative;
  width: 100%;
  min-height: var(--booklet-min-height);
  background-color: var(--color-unilibre-white);
  border-radius: var(--booklet-border-radius);
  box-shadow: var(--booklet-shadow);
  border: 1px solid rgba(0, 0, 0, 0.08);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* Editorial Book Spine Simulation */
.booklet-deck::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 18px;
  background: linear-gradient(90deg, 
    rgba(0, 0, 0, 0.18) 0%, 
    rgba(0, 0, 0, 0.08) 35%, 
    rgba(255, 255, 255, 0.6) 60%, 
    rgba(0, 0, 0, 0.04) 100%);
  pointer-events: none;
  z-index: 10;
  border-top-left-radius: var(--booklet-border-radius);
  border-bottom-left-radius: var(--booklet-border-radius);
}

/* Page Texture / Book Depth */
.booklet-deck::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 8px;
  background: linear-gradient(270deg, rgba(0, 0, 0, 0.06) 0%, transparent 100%);
  pointer-events: none;
  z-index: 10;
}

/* ==========================================================================
   Booklet Pages (8 Semantic Pages)
   ========================================================================== */
.booklet-page,
article.page,
.page-sheet {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  padding: var(--space-xl) calc(var(--space-2xl) + 10px) var(--space-xl) calc(var(--space-2xl) + 20px);
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateX(30px) scale(0.985);
  transition: opacity var(--transition-normal), transform var(--transition-normal), visibility var(--transition-normal);
  background-color: var(--color-unilibre-white);
  box-sizing: border-box;
}

/* Active Page State */
.booklet-page.active,
article.page.active,
.page-sheet.active {
  position: relative;
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(0) scale(1);
  z-index: 5;
}

/* Exit Transition classes for script controller */
.booklet-page.exiting-left {
  transform: translateX(-30px) scale(0.985);
  opacity: 0;
}

.booklet-page.exiting-right {
  transform: translateX(30px) scale(0.985);
  opacity: 0;
}

/* Reduce Motion Accessibility */
@media (prefers-reduced-motion: reduce) {
  .booklet-page,
  .reading-progress-fill,
  .toc-drawer {
    transition: none !important;
    transform: none !important;
  }
}

/* Page Header & Meta */
.page-header {
  margin-bottom: var(--space-lg);
  border-bottom: 2px solid var(--color-border-light);
  padding-bottom: var(--space-md);
  position: relative;
}

.page-badge-category {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: rgba(208, 46, 40, 0.08);
  color: var(--color-unilibre-red-dark);
  border: 1px solid rgba(208, 46, 40, 0.2);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-xs);
}

.page-title {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--color-unilibre-charcoal);
  line-height: 1.2;
  margin: 0 0 var(--space-xs) 0;
}

.page-subtitle {
  font-size: 1rem;
  color: var(--color-text-muted);
  margin: 0;
  font-weight: 500;
}

/* ==========================================================================
   Footer Navigation Bar
   ========================================================================== */
.booklet-footer {
  width: 100%;
  max-width: var(--booklet-max-width);
  margin: var(--space-md) auto var(--space-xl) auto;
  padding: var(--space-sm) var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  background: var(--color-unilibre-white);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  border: 1px solid var(--color-border-light);
}

.nav-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 2px solid transparent;
}

.btn-prev {
  background-color: var(--color-unilibre-bg-light);
  color: var(--color-text-main);
  border-color: var(--color-border-light);
}

.btn-prev:hover:not(:disabled) {
  background-color: var(--color-unilibre-gray-light);
  color: var(--color-unilibre-charcoal);
  transform: translateX(-2px);
}

.btn-next {
  background: linear-gradient(135deg, var(--color-unilibre-red) 0%, var(--color-unilibre-red-dark) 100%);
  color: var(--color-unilibre-white);
  box-shadow: 0 4px 12px rgba(208, 46, 40, 0.3);
}

.btn-next:hover:not(:disabled) {
  transform: translateX(2px);
  box-shadow: 0 6px 16px rgba(208, 46, 40, 0.4);
}

.nav-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

.nav-btn svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

.page-indicator-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

#page-indicator,
.page-indicator {
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--color-unilibre-charcoal);
  letter-spacing: -0.01em;
}

.page-indicator-sub {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 900px) {
  .booklet-page,
  article.page,
  .page-sheet {
    padding: var(--space-lg) var(--space-md);
  }

  .header-inner {
    padding: var(--space-xs) var(--space-md);
  }

  .header-institution {
    font-size: 0.72rem;
  }

  .header-program {
    font-size: 1rem;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .nav-btn {
    padding: 8px 14px;
    font-size: 0.85rem;
  }
}

@media (max-width: 600px) {
  .header-titles .header-campus {
    display: none;
  }

  .btn-toc-toggle span {
    display: none;
  }

  .booklet-footer {
    padding: var(--space-xs) var(--space-sm);
  }

  .nav-btn span {
    display: none;
  }

  .nav-btn {
    padding: 8px 12px;
  }
}