/* controls.css - Controles de navegación Atmos UI y Glassmorphism */

/* Barra de herramientas superior retráctil */
.top-nav {
  position: fixed;
  top: 1rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: 0.55rem 1.25rem;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-md);
  z-index: 100;
  width: min(92vw, 860px);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.top-nav.hidden-hud {
  opacity: 0;
  transform: translate(-50%, -20px);
  pointer-events: none;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  color: #fff;
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
}

.nav-brand .brand-badge {
  background: var(--color-rust);
  color: #fff;
  font-size: 0.65rem;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  letter-spacing: 0.08em;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

/* Botones estándar Atmos UI */
.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  color: #e2e8f0;
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.16);
  border-color: var(--color-rust);
  transform: scale(1.05);
}

.btn-icon:focus-visible {
  outline: 2px solid var(--color-gold);
  outline-offset: 2px;
}

.btn-icon svg {
  width: 1.15rem;
  height: 1.15rem;
  fill: currentColor;
}

.btn-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-full);
  color: #f1f5f9;
  font-size: 0.82rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-pill:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: var(--color-bronze);
}

/* Barra inferior de lectura */
.bottom-nav {
  position: fixed;
  bottom: 1.25rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: 0.6rem 1.4rem;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-lg);
  z-index: 100;
  width: min(92vw, 760px);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.bottom-nav.hidden-hud {
  opacity: 0;
  transform: translate(-50%, 20px);
  pointer-events: none;
}

/* Control deslizante de progreso */
.progress-group {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.progress-track {
  position: relative;
  flex: 1;
  height: 5px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-full);
  overflow: hidden;
  cursor: pointer;
}

.progress-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-rust), var(--color-gold));
  border-radius: var(--radius-full);
  transition: width 120ms ease;
}

.page-indicator-text {
  font-size: 0.78rem;
  color: #cbd5e1;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* Selectores de tema de lectura */
.theme-selector {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  background: rgba(0, 0, 0, 0.25);
  padding: 0.2rem;
  border-radius: var(--radius-full);
}

.theme-btn {
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.theme-btn:hover {
  transform: scale(1.15);
}

.theme-btn.active {
  border-color: var(--color-gold);
  box-shadow: 0 0 8px var(--color-gold);
}

.theme-bone { background: #f7f4ed; }
.theme-parchment { background: #eddcc2; }
.theme-noir { background: #14171c; }

/* Flechas flotantes de página lateral */
.nav-arrow {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  width: 3.2rem;
  height: 3.2rem;
  border-radius: 50%;
  background: rgba(20, 24, 30, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #f1f5f9;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 50;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-fast);
}

.nav-arrow:hover {
  background: rgba(40, 46, 56, 0.85);
  border-color: var(--color-rust);
  transform: translateY(-50%) scale(1.1);
  color: var(--color-gold);
}

.nav-arrow.arrow-prev { left: 1.25rem; }
.nav-arrow.arrow-next { right: 1.25rem; }

/* Menú lateral deslizante (Drawer) para Índice de Capítulos */
.toc-drawer {
  position: fixed;
  top: 0;
  left: 0;
  width: min(85vw, 380px);
  height: 100vh;
  background: rgba(14, 16, 20, 0.94);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-right: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow-lg);
  z-index: 300;
  transform: translateX(-100%);
  transition: transform 300ms cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
}

.toc-drawer.open {
  transform: translateX(0);
}

.toc-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(4px);
  z-index: 250;
  opacity: 0;
  pointer-events: none;
  transition: opacity 250ms ease;
}

.toc-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.toc-header {
  padding: 1.5rem 1.25rem 1rem 1.25rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.toc-header h2 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: 0.12em;
  color: var(--color-gold);
}

.toc-search {
  margin: 0.75rem 1.25rem;
  position: relative;
}

.toc-search input {
  width: 100%;
  padding: 0.55rem 0.85rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  color: #fff;
  font-size: 0.82rem;
  outline: none;
}

.toc-search input:focus {
  border-color: var(--color-rust);
  box-shadow: 0 0 10px var(--color-rust-glow);
}

.toc-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem 0.75rem;
  list-style: none;
}

.toc-item {
  display: flex;
  flex-direction: column;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast);
  margin-bottom: 0.25rem;
  border-left: 2px solid transparent;
}

.toc-item:hover {
  background: rgba(255, 255, 255, 0.06);
  border-left-color: var(--color-rust);
}

.toc-item.active {
  background: rgba(194, 139, 56, 0.15);
  border-left-color: var(--color-gold);
}

.toc-item-number {
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--color-bronze);
  text-transform: uppercase;
}

.toc-item-title {
  font-family: var(--font-serif);
  font-size: 0.88rem;
  color: #e2e8f0;
  margin-top: 0.15rem;
  line-height: 1.35;
}

.toc-item-meta {
  font-size: 0.72rem;
  color: #94a3b8;
  margin-top: 0.25rem;
}

/* Notificación de guardado o atajos */
.toast-notice {
  position: fixed;
  bottom: 5.5rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.5rem 1rem;
  background: rgba(15, 23, 42, 0.95);
  color: #f1f5f9;
  font-size: 0.8rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.15);
  z-index: 20000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease;
}

.toast-notice.show {
  opacity: 1;
}

@media (max-width: 768px) {
  .nav-arrow {
    display: none; /* En móvil se usa el swipe táctil directo sobre la pantalla */
  }
}

/* -------------------------------------------------------------
   MODAL & AUTH STYLES (ATMOS UI)
   ------------------------------------------------------------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(8, 10, 14, 0.78);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
  padding: 1rem;
}

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

.modal-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 440px;
  padding: 2.25rem 2rem;
  position: relative;
  transform: translateY(15px) scale(0.98);
  transition: transform var(--transition-normal);
  color: #f1f5f9;
}

.modal-backdrop.active .modal-card {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: none;
  border: none;
  color: #94a3b8;
  cursor: pointer;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-full);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.modal-close:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.modal-title {
  font-family: var(--font-display);
  font-size: 1.45rem;
  letter-spacing: 0.06em;
  color: #fff;
  margin-bottom: 0.35rem;
  text-align: center;
}

.modal-subtitle {
  font-size: 0.85rem;
  color: #94a3b8;
  text-align: center;
  margin-bottom: 1.5rem;
}

.form-group {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #cbd5e1;
  font-weight: 600;
}

.form-input {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  color: #fff;
  font-size: 0.95rem;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.form-input:focus {
  border-color: var(--color-rust);
  background: rgba(255, 255, 255, 0.08);
}

.btn-primary {
  width: 100%;
  padding: 0.85rem;
  background: var(--color-rust);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
  margin-top: 0.5rem;
}

.btn-primary:hover {
  background: hsl(28, 72%, 42%);
  transform: translateY(-1px);
}

.form-footer {
  margin-top: 1.25rem;
  text-align: center;
  font-size: 0.85rem;
  color: #94a3b8;
}

.form-link {
  color: var(--color-gold);
  background: none;
  border: none;
  cursor: pointer;
  font-weight: 600;
  text-decoration: underline;
  padding: 0;
  margin-left: 0.25rem;
}

/* -------------------------------------------------------------
   LIBRARY / HOME VIEW STYLES
   ------------------------------------------------------------- */
.library-overlay {
  position: fixed;
  inset: 0;
  background: var(--ambient-bg);
  z-index: 500;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  opacity: 1;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.library-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.library-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 2.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  position: sticky;
  top: 0;
  z-index: 50;
}

.library-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.library-logo {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.library-content {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 2rem 4rem;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

/* Hero "Continuar Leyendo" */
.continue-card {
  background: linear-gradient(135deg, rgba(30, 26, 22, 0.85) 0%, rgba(18, 20, 24, 0.95) 100%);
  border: 1px solid rgba(212, 175, 55, 0.25);
  border-radius: var(--radius-lg);
  padding: 2rem 2.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  box-shadow: var(--shadow-md);
}

.continue-info h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: #fff;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}

.continue-info p {
  color: #94a3b8;
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

.progress-bar-wrap {
  width: 280px;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 0.4rem;
}

.progress-bar-inner {
  height: 100%;
  background: var(--color-rust);
  border-radius: var(--radius-full);
  width: 0%;
}

.progress-label {
  font-size: 0.78rem;
  color: #cbd5e1;
}

/* Grid de Libros */
.section-title-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: 0.08em;
  color: #fff;
}

.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 2rem;
}

.book-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 1rem;
  cursor: pointer;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.book-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-rust);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5);
}

.book-card-cover {
  width: 100%;
  aspect-ratio: 2/3;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.2rem 1rem;
  color: #f8fafc;
  box-shadow: inset 4px 0 10px rgba(0, 0, 0, 0.3), var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.book-card-cover.native-cover {
  background: linear-gradient(135deg, #261f1a 0%, #151210 100%);
  border: 1px solid rgba(212, 175, 55, 0.3);
}

.book-card-cover.pdf-cover {
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.35;
  color: #fff;
}

.card-author {
  font-size: 0.8rem;
  color: #94a3b8;
}

/* Upload Dropzone Card */
.upload-card {
  border: 2px dashed rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-md);
  aspect-ratio: 2/3;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.5rem;
  color: #94a3b8;
  cursor: pointer;
  background: rgba(255, 255, 255, 0.01);
  transition: all var(--transition-normal);
}

.upload-card:hover {
  border-color: var(--color-rust);
  color: #fff;
  background: rgba(255, 255, 255, 0.04);
}

.upload-card svg {
  margin-bottom: 0.75rem;
  color: var(--color-rust);
}

.user-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255, 255, 255, 0.08);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.82rem;
  color: #f1f5f9;
}

/* -------------------------------------------------------------
   AUTH GATE SCREEN (PANTALLA DE ACCESO REQUERIDO)
   ------------------------------------------------------------- */
.auth-gate-screen {
  position: fixed;
  inset: 0;
  background: #0d0f13; /* Fondo obsidian completamente opaco para blindaje total */
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.auth-gate-screen.hidden {
  display: none !important;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.auth-gate-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 440px;
  padding: 2.5rem 2.2rem;
  position: relative;
  text-align: center;
  color: #f1f5f9;
}

.auth-brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: #fff;
  margin-bottom: 0.75rem;
}

.auth-gate-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: #fff;
  letter-spacing: 0.04em;
  margin-bottom: 0.4rem;
  line-height: 1.35;
}

.auth-gate-desc {
  font-size: 0.85rem;
  color: #94a3b8;
  margin-bottom: 1.75rem;
  line-height: 1.5;
}

.reader-viewport.hidden,
.library-overlay.hidden {
  display: none !important;
}

/* Blindaje contra filtrado visual antes de resolver autenticación */
body.unauthenticated .reader-viewport,
body.unauthenticated .top-nav,
body.unauthenticated .bottom-nav,
body.unauthenticated .nav-arrow,
body.unauthenticated .book-stage,
body.unauthenticated .library-overlay {
  display: none !important;
}