/* ==========================================================================
   Entrenador de Flashcards y Repaso Espaciado - Fijate Tools
   Estilos Canónicos, Tarjeta 3D Flip, Cajas de Leitner y Temas
   ========================================================================== */

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #151c2c;
  --bg-card-hover: #1c2538;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: #3b82f6;

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

  --accent-primary: #3b82f6;
  --accent-hover: #2563eb;
  --accent-glow: rgba(59, 130, 246, 0.25);

  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --color-purple: #8b5cf6;
  --color-teal: #14b8a6;

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

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.5);
}

[data-theme="light"],
body.light-theme {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --border-color: rgba(0, 0, 0, 0.08);
  --border-focus: #2563eb;

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

  --accent-primary: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-glow: rgba(37, 99, 235, 0.15);

  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.06);
}

/* Layout */
body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  overflow-x: clip;
  width: 100%;
  max-width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.tool-layout {
  max-width: 1200px;
  margin: 1.5rem auto 3rem;
  padding: 0 1rem;
  box-sizing: border-box;
  flex: 1 0 auto;
}

.tool-with-sidebar {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
}

.tool-main-content {
  flex: 1 1 0%;
  min-width: 0;
  max-width: 100%;
}

.card-main {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 1.5rem;
  box-sizing: border-box;
  margin-bottom: 2rem;
}

/* Presets */
.presets-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.presets-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.presets-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.preset-chip {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 34px;
}

.preset-chip:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
  border-color: var(--accent-primary);
}

.preset-chip.active {
  background: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
}

.preset-chip.chip-clear {
  color: var(--color-warning);
  border-color: rgba(245, 158, 11, 0.3);
}

.preset-chip.chip-clear:hover {
  background: rgba(245, 158, 11, 0.15);
  border-color: var(--color-warning);
}

/* Cuadrícula de 2 columnas */
.workspace-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

@media (max-width: 960px) {
  .workspace-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

.workspace-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-sizing: border-box;
  min-width: 0;
}

.card-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.card-title-sub {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  margin: 0;
  color: var(--text-primary);
}

.label-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Formularios */
.form-group {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
}

.form-control {
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  min-height: 42px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.textarea-card-field {
  resize: vertical;
  line-height: 1.5;
}

.btn-primary-action {
  width: 100%;
  min-height: 44px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-hover));
  color: #ffffff;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  cursor: pointer;
  box-shadow: 0 4px 12px var(--accent-glow);
  transition: transform 0.15s, box-shadow 0.15s;
}

.btn-primary-action:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px var(--accent-glow);
}

/* Importación rápida */
.import-details {
  margin-top: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.import-summary {
  padding: 0.65rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
}

.import-summary:hover {
  color: var(--text-primary);
}

.import-body {
  padding: 0.85rem;
  border-top: 1px solid var(--border-color);
}

.import-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0 0 0.5rem 0;
}

.textarea-import {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  min-height: 80px;
}

.btn-secondary-action {
  width: 100%;
  min-height: 38px;
  margin-top: 0.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
}

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

/* Panel de Cajas de Leitner */
.leitner-boxes-panel {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-color);
}

.leitner-panel-title {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  margin: 0 0 0.85rem 0;
  color: var(--text-primary);
}

.boxes-track-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.4rem;
}

@media (max-width: 480px) {
  .boxes-track-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.box-stat-pill {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.3rem;
  text-align: center;
  display: flex;
  flex-direction: column;
}

.box-tag {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-muted);
}

.box-count {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 800;
  margin: 0.2rem 0;
}

.box-desc {
  font-size: 0.68rem;
  color: var(--text-secondary);
}

.box-1 .box-count { color: var(--color-danger); }
.box-2 .box-count { color: var(--color-warning); }
.box-3 .box-count { color: var(--accent-primary); }
.box-4 .box-count { color: var(--color-purple); }
.box-5 .box-count { color: var(--color-success); }

/* ==========================================================================
   COLUMNA DERECHA: Escenario de Estudio con Flashcard 3D
   ========================================================================== */
.deck-meta-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.deck-title-badge {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.card-index-counter {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  background: var(--bg-card);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
}

.study-actions-top {
  display: flex;
  gap: 0.4rem;
}

.btn-icon-study {
  width: 34px;
  height: 34px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s;
}

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

/* Escenario 3D */
.flashcard-3d-scene {
  perspective: 1200px;
  margin-bottom: 1.25rem;
  cursor: pointer;
  user-select: none;
  outline: none;
}

.flashcard-3d-card {
  width: 100%;
  min-height: 290px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.45s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: var(--radius-lg);
}

.flashcard-3d-card.flipped {
  transform: rotateY(180deg);
}

.flashcard-face {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border: 1px solid var(--border-color);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.35);
}

.flashcard-front {
  background: linear-gradient(180deg, var(--bg-card) 0%, var(--bg-secondary) 100%);
}

.flashcard-back {
  background: linear-gradient(180deg, rgba(59, 130, 246, 0.12) 0%, var(--bg-card) 100%);
  border-color: rgba(59, 130, 246, 0.4);
  transform: rotateY(180deg);
}

.card-side-badge {
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
}

.badge-back {
  color: var(--accent-primary);
}

.card-body-text {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.5;
  text-align: center;
  margin: 1.5rem 0;
  overflow-y: auto;
  max-height: 180px;
}

.card-flip-prompt {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Botones de valoración Leitner */
.rating-controls-bar {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.btn-rate {
  min-height: 52px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.6rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
  background: var(--bg-card);
}

.btn-rate:hover {
  transform: translateY(-2px);
}

.rate-key {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 800;
  background: var(--bg-secondary);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--border-color);
  margin-bottom: 0.15rem;
}

.rate-name {
  font-family: var(--font-heading);
  font-size: 0.88rem;
  font-weight: 700;
}

.rate-sub {
  font-size: 0.68rem;
  color: var(--text-muted);
}

.btn-rate-fail { border-color: rgba(239, 68, 68, 0.3); }
.btn-rate-fail:hover { background: rgba(239, 68, 68, 0.15); border-color: var(--color-danger); }
.btn-rate-fail .rate-name { color: var(--color-danger); }

.btn-rate-hard { border-color: rgba(245, 158, 11, 0.3); }
.btn-rate-hard:hover { background: rgba(245, 158, 11, 0.15); border-color: var(--color-warning); }
.btn-rate-hard .rate-name { color: var(--color-warning); }

.btn-rate-easy { border-color: rgba(16, 185, 129, 0.3); }
.btn-rate-easy:hover { background: rgba(16, 185, 129, 0.15); border-color: var(--color-success); }
.btn-rate-easy .rate-name { color: var(--color-success); }

/* Barra de sesión */
.session-stats-bar {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  margin-bottom: 1.25rem;
  font-size: 0.82rem;
}

.stat-pill {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.stat-pill-label {
  color: var(--text-secondary);
}

.stat-pill-val {
  font-family: var(--font-mono);
}

.actions-hero-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.btn-action-outline {
  min-height: 42px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.88rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-action-outline:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

/* Modal */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: 1rem;
  box-sizing: border-box;
}

.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  max-width: 440px;
  width: 100%;
  padding: 1.5rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
}

.modal-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.modal-icon-alert { color: var(--color-warning); }
.modal-title { font-family: var(--font-heading); font-size: 1.15rem; margin: 0; color: var(--text-primary); }
.modal-body p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.5; margin: 0 0 1.25rem 0; }
.modal-footer { display: flex; justify-content: flex-end; gap: 0.75rem; }

.btn-modal-secondary {
  min-height: 40px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  padding: 0 1rem;
  font-weight: 600;
  cursor: pointer;
}

.btn-modal-danger {
  min-height: 40px;
  background: var(--color-warning);
  color: #000000;
  border: none;
  border-radius: var(--radius-sm);
  padding: 0 1.2rem;
  font-weight: 700;
  cursor: pointer;
}

/* Guía SEO */
.seo-guide-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  margin-top: 2rem;
}

.seo-guide-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-primary);
  background: rgba(59, 130, 246, 0.15);
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.seo-guide-title {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  margin: 0 0 0.5rem 0;
}

.seo-guide-lead {
  font-size: 1rem;
  color: var(--text-secondary);
  margin: 0 0 1.75rem 0;
  max-width: 900px;
}

.seo-guide-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

@media (max-width: 800px) {
  .seo-guide-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}

.seo-guide-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.seo-card-title {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 0.75rem 0;
}

.seo-guide-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0 0 0.85rem 0;
}

.seo-list-checked {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--text-secondary);
  font-size: 0.88rem;
  line-height: 1.7;
}

.seo-table-box {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-bottom: 2rem;
}

.seo-table-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 1rem 0;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
}

.seo-guide-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.seo-guide-table th {
  background: var(--bg-card);
  padding: 0.75rem 0.85rem;
  color: var(--text-secondary);
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.82rem;
}

.seo-guide-table td {
  padding: 0.75rem 0.85rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
}

.seo-faq-block {
  margin-top: 1.5rem;
}

.seo-faq-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 1rem 0;
  color: var(--text-primary);
}

.faq-item {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
}

.faq-question {
  padding: 0.85rem 1rem;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  color: var(--text-primary);
}

.faq-answer {
  padding: 0.85rem 1rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.faq-answer p { margin: 0; }

/* ==========================================================================
   Vista Documental A4 para Impresión (.print-sheet)
   ========================================================================== */
@media print {
  body * {
    visibility: hidden !important;
  }

  .print-sheet,
  .print-sheet * {
    visibility: visible !important;
  }

  .print-sheet {
    display: block !important;
    position: absolute !important;
    left: 0 !important;
    top: 0 !important;
    width: 100% !important;
    max-width: 210mm !important;
    margin: 0 auto !important;
    padding: 15mm !important;
    background: #ffffff !important;
    color: #000000 !important;
    font-family: Arial, Helvetica, sans-serif !important;
    box-sizing: border-box !important;
  }

  .print-header {
    border-bottom: 2px solid #000000;
    padding-bottom: 10px;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
  }

  .print-brand h2 { font-size: 16pt; margin: 0; }
  .print-sub { font-size: 9pt; color: #444; }
  .print-meta { text-align: right; font-size: 9pt; }

  .print-cards-grid {
    display: grid !important;
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 15px !important;
  }

  .print-card-item {
    border: 1px dashed #444 !important;
    padding: 10px !important;
    box-sizing: border-box !important;
    page-break-inside: avoid !important;
  }

  .print-card-front {
    border-bottom: 1px dotted #888 !important;
    padding-bottom: 8px !important;
    margin-bottom: 8px !important;
  }

  .print-tag { font-size: 7pt; text-transform: uppercase; color: #666; font-weight: bold; }
  .print-text { font-size: 10pt; font-weight: bold; color: #000; margin-top: 4px; }
  .print-answer { font-size: 9pt; color: #222; margin-top: 4px; }

  .print-footer {
    font-size: 8pt;
    color: #666;
    border-top: 1px solid #ccc;
    padding-top: 8px;
    margin-top: 30px;
  }
}