/**
 * Estilos principales - Conversor de EPUB a AZW3 (Kindle KF8)
 * Fijate Tools
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Outfit:wght@500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* Paleta Base Oscura (Predeterminada) */
  --bg-app: #080c14;
  --bg-surface: #0f172a;
  --bg-surface-elevated: #1e293b;
  --bg-surface-hover: #334155;
  --bg-input: #0b1120;
  --bg-code: #070b12;

  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: #3b82f6;
  --border-strong: rgba(255, 255, 255, 0.16);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-inverse: #0f172a;

  --bg-card: #0f172a;

  --accent-primary: #3b82f6;
  --accent-primary-hover: #2563eb;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-emerald-hover: #059669;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --accent-purple: #8b5cf6;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px -5px rgba(59, 130, 246, 0.35);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Outfit', var(--font-sans);
  --font-mono: 'JetBrains Mono', monospace;

  --header-height: 68px;
}

[data-theme="light"] {
  --bg-app: #f1f5f9;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f8fafc;
  --bg-surface-hover: #e2e8f0;
  --bg-input: #ffffff;
  --bg-code: #f8fafc;

  --border-subtle: rgba(0, 0, 0, 0.08);
  --border-color: #e2e8f0;
  --border-focus: #2563eb;
  --border-strong: rgba(0, 0, 0, 0.16);

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

  --bg-card: #ffffff;

  --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, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-glow: 0 0 25px -5px rgba(37, 99, 235, 0.2);
}

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

html {
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--bg-app);
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: radial-gradient(circle at 50% 0%, rgba(59, 130, 246, 0.07) 0%, transparent 50%), var(--bg-app);
}

/* Cabecera Principal */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  height: var(--header-height);
  backdrop-filter: blur(12px);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  height: 100%;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.btn-back-tools {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-surface-elevated);
  transition: all 0.15s ease;
}

.btn-back-tools:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
  transform: translateX(-2px);
}

.brand-area {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  color: inherit;
}

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.brand-text h1 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

.brand-text span {
  font-size: 0.76rem;
  color: var(--text-muted);
  display: block;
}

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

.privacy-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-full);
  background-color: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: var(--accent-emerald);
  font-size: 0.78rem;
  font-weight: 600;
}

/* Botones y etiquetas interactivas */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.18s ease;
  white-space: nowrap;
  user-select: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary), #2563eb);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.45);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--bg-surface-elevated);
  border-color: var(--border-strong);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: var(--bg-surface-hover);
  border-color: var(--border-focus);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface-hover);
}

.btn-success {
  background: linear-gradient(135deg, var(--accent-emerald), var(--accent-emerald-hover));
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.35);
}

.btn-success:hover {
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.45);
  transform: translateY(-1px);
}

.btn-danger {
  background: linear-gradient(135deg, var(--accent-rose), #e11d48);
  color: #ffffff;
}

.btn-sm {
  padding: 0.4rem 0.8rem;
  font-size: 0.82rem;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-md);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-purple {
  background-color: rgba(139, 92, 246, 0.15);
  color: var(--accent-purple);
  border: 1px solid rgba(139, 92, 246, 0.3);
}

.badge-primary {
  background-color: rgba(59, 130, 246, 0.15);
  color: var(--accent-primary);
  border: 1px solid rgba(59, 130, 246, 0.3);
}

.badge-neutral {
  background-color: var(--bg-surface-hover);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

/* Contenido Principal */
.app-main {
  flex: 1;
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
  padding: 2.2rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

/* Hero Section */
.hero-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background-color: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.25);
  color: var(--accent-primary);
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 0.9rem;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  letter-spacing: -0.02em;
}

.hero-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Zona Drag & Drop */
.dropzone-container {
  background-color: var(--bg-surface);
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-xl);
  padding: 3rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.22s ease;
  position: relative;
  overflow: hidden;
}

.dropzone-container:hover,
.dropzone-container.dragover {
  border-color: var(--accent-primary);
  background-color: rgba(59, 130, 246, 0.03);
  box-shadow: var(--shadow-glow);
}

.dropzone-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  background-color: rgba(59, 130, 246, 0.12);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
  transition: transform 0.2s ease;
}

.dropzone-container:hover .dropzone-icon {
  transform: scale(1.08) translateY(-2px);
}

.dropzone-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.dropzone-subtitle {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.dropzone-buttons-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Cola de Archivos y Tarjetas */
.queue-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.queue-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.queue-title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

/* Control de Multitarea / Hilos en Paralelo */
.concurrency-control-group {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.65rem;
  background-color: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  color: var(--accent-primary);
  font-weight: 500;
}

.concurrency-control-group label {
  color: var(--text-secondary);
  cursor: pointer;
}

.select-concurrency {
  background-color: transparent;
  color: var(--text-primary);
  border: none;
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  outline: none;
  padding: 0.15rem 0.25rem;
}

.select-concurrency option {
  background-color: var(--bg-surface);
  color: var(--text-primary);
}

/* Panel de Progreso Global Multitarea */
.multitask-progress-panel {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.12), rgba(139, 92, 246, 0.08));
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.3rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.1);
  animation: fadeIn 0.3s ease;
}

.multitask-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.multitask-status-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
}

.multitask-pulse-dot {
  width: 9px;
  height: 9px;
  border-radius: var(--radius-full);
  background-color: var(--accent-primary);
  box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.7);
  animation: pulse-ring 1.5s cubic-bezier(0.45, 0, 0.55, 1) infinite;
}

@keyframes pulse-ring {
  0% {
    box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.7);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(59, 130, 246, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(59, 130, 246, 0);
  }
}

.multitask-stats-badge {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  background-color: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius-sm);
  color: var(--accent-primary);
}

.multitask-progress-bar {
  width: 100%;
  height: 8px;
  background-color: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  overflow: hidden;
}

[data-theme="light"] .multitask-progress-bar {
  background-color: rgba(0, 0, 0, 0.08);
}

.multitask-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-cyan));
  border-radius: var(--radius-full);
  transition: width 0.25s ease;
  position: relative;
  overflow: hidden;
}

.multitask-progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 1.5s infinite;
}

.multitask-panel-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Banner de Descarga Masiva */
.batch-download-banner {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.12), rgba(59, 130, 246, 0.1));
  border: 1px solid rgba(16, 185, 129, 0.35);
  border-radius: var(--radius-lg);
  padding: 1.25rem 1.4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  flex-wrap: wrap;
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.12);
}

.batch-banner-content {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.batch-banner-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--accent-emerald), var(--accent-emerald-hover));
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.35);
}

.batch-banner-text h4 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 0.2rem;
}

.batch-banner-text p {
  font-size: 0.84rem;
}

.batch-banner-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.files-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.book-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.book-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.book-card-main {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
}

/* Portada del libro */
.book-cover-container {
  width: 90px;
  height: 125px;
  flex-shrink: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.book-cover-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.5rem;
  text-align: center;
  color: var(--text-muted);
}

.book-cover-placeholder svg {
  width: 28px;
  height: 28px;
}

.book-cover-placeholder span {
  font-size: 0.68rem;
  line-height: 1.2;
}

/* Info del libro */
.book-info-container {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.book-header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}

.book-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-remove-item {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.btn-remove-item:hover {
  color: var(--accent-rose);
  background-color: rgba(244, 63, 94, 0.1);
}

.book-author {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.book-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.1rem;
}

/* Opciones de acordeón */
.book-options-accordion {
  margin-top: 0.4rem;
}

.btn-toggle-options {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.2rem 0;
  transition: color 0.15s ease;
}

.btn-toggle-options:hover,
.btn-toggle-options.active {
  color: var(--accent-primary);
}

.btn-toggle-options .chevron-icon {
  transition: transform 0.2s ease;
}

.btn-toggle-options.active .chevron-icon {
  transform: rotate(180deg);
}

.options-drawer {
  margin-top: 0.75rem;
  padding: 0.9rem;
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
}

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

.form-group label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.input-option {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.45rem 0.65rem;
  font-size: 0.82rem;
  color: var(--text-primary);
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s ease;
}

.input-option:focus {
  border-color: var(--border-focus);
}

/* Barra de progreso */
.progress-wrapper {
  margin-top: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.progress-bar-bg {
  width: 100%;
  height: 8px;
  background-color: var(--bg-input);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-purple));
  border-radius: var(--radius-full);
  transition: width 0.3s ease;
}

.progress-status-text {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

/* Caja de Resultado */
.result-box {
  margin-top: 0.85rem;
  padding: 0.85rem 1rem;
  background-color: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.result-details {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.result-icon-check {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background-color: var(--accent-emerald);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.result-text {
  display: flex;
  flex-direction: column;
}

.result-text strong {
  font-size: 0.88rem;
  color: var(--text-primary);
}

.result-stats {
  font-size: 0.76rem;
  color: var(--text-muted);
}

.result-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* Columna de Acción */
.book-action-col {
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

/* Guía Kindle Informativa */
.kindle-guide-section {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.guide-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.guide-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.guide-card {
  background-color: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.guide-card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background-color: rgba(59, 130, 246, 0.12);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.guide-card h4 {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
}

.guide-card p {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.text-muted {
  color: var(--text-muted);
}

/* Responsividad */
@media (max-width: 768px) {
  .header-container {
    padding: 0 1rem;
  }
  
  .privacy-badge span {
    display: none;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .book-card-main {
    flex-direction: column;
    align-items: stretch;
  }

  .book-cover-container {
    width: 70px;
    height: 98px;
  }

  .book-action-col {
    margin-top: 0.5rem;
    justify-content: stretch;
  }

  .book-action-col .btn {
    width: 100%;
  }

  .result-box {
    flex-direction: column;
    align-items: stretch;
  }

  .result-actions .btn {
    width: 100%;
  }
}