/**
 * Taller de Origami Paso a Paso - Fijate Tools
 * Estilos canónicos corporativos (Midnight Slate & Tema Claro)
 */

:root {
  --bg-primary: #0b0f17;
  --bg-card: #111827;
  --bg-card-hover: #172033;
  --bg-surface: #1e293b;
  --bg-input: #0f172a;
  --border-color: #1f293d;
  --border-focus: #3b82f6;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --origami-accent: #38bdf8;
  --origami-accent-hover: #0284c7;
  --origami-glow: rgba(56, 189, 248, 0.25);
  
  --badge-easy-bg: rgba(16, 185, 129, 0.15);
  --badge-easy-text: #34d399;
  --badge-easy-border: rgba(16, 185, 129, 0.3);

  --badge-medium-bg: rgba(245, 158, 11, 0.15);
  --badge-medium-text: #fbbf24;
  --badge-medium-border: rgba(245, 158, 11, 0.3);

  --badge-hard-bg: rgba(239, 68, 68, 0.15);
  --badge-hard-text: #f87171;
  --badge-hard-border: rgba(239, 68, 68, 0.3);

  --paper-shadow: 0 20px 35px -10px rgba(0, 0, 0, 0.5), 0 0 15px rgba(56, 189, 248, 0.1);
  --radius-card: 16px;
  --radius-btn: 10px;
  --radius-pill: 9999px;
  --transition-fast: 0.2s ease;
}

[data-theme="light"],
body.light-theme {
  --bg-primary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-surface: #e2e8f0;
  --bg-input: #ffffff;
  --border-color: #cbd5e1;
  --border-focus: #2563eb;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  
  --origami-accent: #0284c7;
  --origami-accent-hover: #0369a1;
  --origami-glow: rgba(2, 132, 199, 0.15);

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

  --badge-medium-bg: #fffbeb;
  --badge-medium-text: #92400e;
  --badge-medium-border: #fde68a;

  --badge-hard-bg: #fef2f2;
  --badge-hard-text: #991b1b;
  --badge-hard-border: #fecaca;

  --paper-shadow: 0 12px 28px -8px rgba(0, 0, 0, 0.15), 0 4px 10px rgba(0, 0, 0, 0.05);
}

/* Base del layout */
body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  overflow-x: clip;
  width: 100%;
  max-width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 0;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Outfit', sans-serif;
  color: var(--text-primary);
  margin-top: 0;
  letter-spacing: -0.015em;
}

.mono-num {
  font-family: 'JetBrains Mono', monospace;
}

.tool-layout {
  max-width: 1200px;
  margin: 1.5rem auto 3.5rem;
  padding: 0 1rem;
  width: 100%;
  box-sizing: border-box;
}

.tool-with-sidebar {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  width: 100%;
}

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

/* Tarjeta principal */
.card-main {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 1.75rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  margin-bottom: 2rem;
}

/* Navegación por pestañas */
.tool-tabs-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

.tool-tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  font-family: 'Outfit', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.65rem 1.15rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 42px;
}

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

.tool-tab-btn.active {
  background-color: var(--origami-accent);
  color: #ffffff;
  border-color: var(--origami-accent);
  box-shadow: 0 4px 14px var(--origami-glow);
}

.tool-tab-btn svg {
  flex-shrink: 0;
}

/* Secciones de contenido */
.tool-tab-pane {
  display: none;
}

.tool-tab-pane.active {
  display: block;
  animation: fadeInPane 0.25s ease-out;
}

@keyframes fadeInPane {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   1. VISTA: VISOR INTERACTIVO PASO A PASO
   ========================================================================== */
.viewer-workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.95fr);
  gap: 1.75rem;
  align-items: stretch;
}

/* Escenario visual del papel */
.viewer-canvas-card {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.4), rgba(15, 23, 42, 0.8));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  position: relative;
  min-height: 420px;
}

.paper-stage-wrapper {
  width: 100%;
  max-width: 380px;
  aspect-ratio: 1 / 1;
  margin: auto;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  filter: drop-shadow(0 15px 25px rgba(0,0,0,0.35));
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.paper-stage-svg-box {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.paper-stage-svg-box svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

/* Indicador flotante de tipo de acción */
.step-action-badge {
  position: absolute;
  top: 1rem;
  left: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-pill);
  font-size: 0.8rem;
  font-weight: 700;
  font-family: 'Outfit', sans-serif;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(6px);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  z-index: 10;
}

.step-action-badge.valley {
  border-color: #38bdf8;
  color: #38bdf8;
}

.step-action-badge.mountain {
  border-color: #f43f5e;
  color: #f43f5e;
}

.step-action-badge.squash {
  border-color: #34d399;
  color: #34d399;
}

.step-action-badge.finish {
  border-color: #fbbf24;
  color: #fbbf24;
}

/* Barra de progreso de pasos */
.viewer-progress-bar-wrap {
  width: 100%;
  margin-top: 1rem;
}

.progress-track {
  width: 100%;
  height: 6px;
  background-color: var(--bg-surface);
  border-radius: var(--radius-pill);
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #38bdf8, #818cf8);
  border-radius: var(--radius-pill);
  transition: width 0.3s ease;
}

.step-dots-list {
  display: flex;
  justify-content: space-between;
  gap: 4px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: thin;
}

.step-dot-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-secondary);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}

.step-dot-btn:hover {
  color: var(--text-primary);
  border-color: var(--origami-accent);
}

.step-dot-btn.completed {
  background-color: rgba(56, 189, 248, 0.15);
  color: #38bdf8;
  border-color: #38bdf8;
}

.step-dot-btn.active {
  background-color: var(--origami-accent);
  color: #ffffff;
  border-color: var(--origami-accent);
  transform: scale(1.15);
  box-shadow: 0 0 10px var(--origami-glow);
}

/* Panel lateral del visor */
.viewer-info-panel {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.25rem;
}

.figure-header-block {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

.figure-title-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.35rem;
}

.figure-name-main {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0;
}

.figure-kanji {
  font-family: 'Outfit', sans-serif;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.figure-meta-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  font-family: 'Outfit', sans-serif;
}

.badge-easy {
  background-color: var(--badge-easy-bg);
  color: var(--badge-easy-text);
  border: 1px solid var(--badge-easy-border);
}

.badge-medium {
  background-color: var(--badge-medium-bg);
  color: var(--badge-medium-text);
  border: 1px solid var(--badge-medium-border);
}

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

/* Bloque del paso actual */
.step-content-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  flex: 1 1 auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.step-badge-counter {
  font-family: 'Outfit', sans-serif;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--origami-accent);
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.step-title-text {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.step-instruction-text {
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--text-secondary);
  margin: 0 0 0.85rem 0;
}

.step-tip-box {
  background-color: rgba(56, 189, 248, 0.08);
  border-left: 3px solid var(--origami-accent);
  padding: 0.65rem 0.85rem;
  border-radius: 0 8px 8px 0;
  font-size: 0.85rem;
  color: var(--text-primary);
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.step-tip-box svg {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--origami-accent);
}

/* Controles de navegación táctiles */
.viewer-controls-cluster {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

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

.btn-nav-step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 46px;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-btn);
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  width: 100%;
  box-sizing: border-box;
}

.btn-nav-prev {
  background-color: var(--bg-surface);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.btn-nav-prev:hover:not(:disabled) {
  background-color: var(--bg-card-hover);
  border-color: var(--origami-accent);
}

.btn-nav-next {
  background-color: var(--origami-accent);
  color: #ffffff;
  box-shadow: 0 4px 14px var(--origami-glow);
}

.btn-nav-next:hover:not(:disabled) {
  background-color: var(--origami-accent-hover);
}

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

.secondary-actions-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.btn-utility-action {
  flex: 1 1 0%;
  min-width: 0;
  min-height: 40px;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-btn);
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: 'Outfit', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-utility-action:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface);
  border-color: var(--origami-accent);
}

.btn-utility-action.active {
  background-color: rgba(56, 189, 248, 0.15);
  border-color: #38bdf8;
  color: #38bdf8;
}

/* ==========================================================================
   2. VISTA: CATÁLOGO DE FIGURAS
   ========================================================================== */
.catalog-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.filter-pills-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.pill-filter-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-family: 'Outfit', sans-serif;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.45rem 0.9rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 38px;
}

.pill-filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--origami-accent);
}

.pill-filter-btn.active {
  background-color: var(--origami-accent);
  color: #ffffff;
  border-color: var(--origami-accent);
}

.catalog-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 1.25rem;
}

.origami-card-item {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  cursor: pointer;
  position: relative;
}

.origami-card-item:hover {
  transform: translateY(-4px);
  border-color: var(--origami-accent);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.25);
}

.card-item-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.card-preview-thumb {
  width: 70px;
  height: 70px;
  border-radius: 12px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px;
  box-sizing: border-box;
}

.card-preview-thumb svg {
  width: 100%;
  height: 100%;
}

.card-item-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.card-item-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.45;
  margin-bottom: 1rem;
  flex: 1 1 auto;
}

.card-item-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  padding-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.btn-open-figure {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--origami-accent);
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-pill);
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.origami-card-item:hover .btn-open-figure {
  background-color: var(--origami-accent);
  color: #ffffff;
  border-color: var(--origami-accent);
}

/* ==========================================================================
   3. VISTA: GENERADOR DE LÁMINAS IMPRIMIBLES (A4)
   ========================================================================== */
.print-generator-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: 2rem;
  align-items: flex-start;
}

.print-options-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 1.5rem;
}

.form-group-custom {
  margin-bottom: 1.25rem;
}

.form-label-custom {
  display: block;
  font-family: 'Outfit', sans-serif;
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.select-custom {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  min-height: 42px;
  height: 42px;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  box-sizing: border-box;
  background-color: var(--bg-input);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-btn);
  padding: 0 40px 0 1rem;
  font-family: inherit;
  font-size: 0.95rem;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2338bdf8' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 16px;
  outline: none;
  cursor: pointer;
}

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

.select-custom option,
.select-custom optgroup {
  background-color: var(--bg-card);
  color: var(--text-primary);
}

/* Patrones de papel */
.pattern-swatches-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.pattern-swatch-item {
  border: 2px solid var(--border-color);
  border-radius: 8px;
  padding: 0.6rem;
  background-color: var(--bg-card);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  text-align: center;
  transition: all var(--transition-fast);
}

.pattern-swatch-item:hover {
  border-color: var(--origami-accent);
}

.pattern-swatch-item.active {
  border-color: var(--origami-accent);
  background-color: rgba(56, 189, 248, 0.12);
}

.swatch-circle {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.swatch-name {
  font-size: 0.75rem;
  font-weight: 600;
}

/* Vista previa de lámina A4 */
.print-preview-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.a4-sheet-preview-mockup {
  width: 100%;
  max-width: 340px;
  aspect-ratio: 1 / 1.414; /* Proporción A4 */
  background: #ffffff;
  border: 1px solid #cbd5e1;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  padding: 1rem;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: #0f172a;
  position: relative;
}

.a4-square-cut-area {
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 1.5px dashed #ef4444;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #f8fafc;
}

.cut-scissors-icon {
  position: absolute;
  top: -10px;
  left: 10px;
  background: #ffffff;
  padding: 0 4px;
  color: #ef4444;
}

.btn-print-trigger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  width: 100%;
  padding: 0.75rem 1.25rem;
  background-color: #10b981;
  color: #ffffff;
  border: none;
  border-radius: var(--radius-btn);
  font-family: 'Outfit', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  margin-top: 1rem;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
  transition: background-color var(--transition-fast);
}

.btn-print-trigger:hover {
  background-color: #059669;
}

/* ==========================================================================
   4. VISTA: GLOSARIO Y SIMBOLOGÍA
   ========================================================================== */
.symbols-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.25rem;
}

.symbol-card-item {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  display: flex;
  gap: 1rem;
  align-items: center;
}

.symbol-icon-box {
  width: 68px;
  height: 52px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.symbol-name-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.symbol-desc-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.45;
  margin: 0;
}

/* ==========================================================================
   5. SECCIÓN DIDÁCTICA Y BENEFICIOS
   ========================================================================== */
.educational-section {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  padding: 1.75rem;
  margin-top: 2rem;
}

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

.educational-feature-box {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
}

.feature-icon-bubble {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(56, 189, 248, 0.12);
  color: #38bdf8;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.75rem;
}

.educational-feature-box h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
}

.educational-feature-box p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0;
}

/* ==========================================================================
   6. MODALES CANÓNICOS (CORRECCIÓN 251)
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.88);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: all 0.25s ease;
  padding: 1rem;
  box-sizing: border-box;
}

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

.modal-content-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-card);
  max-width: 520px;
  width: 100%;
  padding: 1.75rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  position: relative;
  max-height: 90vh;
  overflow-y: auto;
}

.btn-close-modal {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-close-modal:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface);
  border-color: var(--origami-accent);
}

/* ==========================================================================
   7. HOJA EXCLUSIVA DE IMPRESIÓN A4 (CORRECCIÓN 238)
   ========================================================================== */
.print-sheet-a4 {
  display: none;
}

@media print {
  /* Ocultar interfaz web completa, cabeceras, anuncios y navegación */
  body {
    background: #ffffff !important;
    color: #000000 !important;
    font-size: 12pt;
    margin: 0 !important;
    padding: 0 !important;
  }

  .app-header,
  .fijate-footer,
  .tools-ad-banner-section,
  .tool-ad-sidebar,
  .tool-tabs-nav,
  .viewer-controls-cluster,
  .catalog-toolbar,
  .educational-section,
  .card-main,
  .modal-overlay {
    display: none !important;
  }

  /* Activar hoja A4 limpia */
  .print-sheet-a4 {
    display: block !important;
    width: 210mm;
    height: 297mm;
    margin: 0 auto;
    padding: 15mm;
    box-sizing: border-box;
    page-break-after: always;
    background: #ffffff;
    color: #000000;
  }

  .print-header-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    border-bottom: 2px solid #000000;
    padding-bottom: 6mm;
    margin-bottom: 10mm;
  }

  .print-square-wrapper {
    width: 170mm;
    height: 170mm;
    margin: 0 auto 10mm;
    border: 1.5mm dashed #000000;
    position: relative;
    box-sizing: border-box;
  }

  .print-instructions-footer {
    font-size: 9pt;
    line-height: 1.4;
    border-top: 1px solid #999999;
    padding-top: 4mm;
  }
}

/* ==========================================================================
   8. MEDIA QUERIES RESPONSIVAS
   ========================================================================== */
@media (max-width: 900px) {
  .viewer-workspace {
    grid-template-columns: minmax(0, 1fr);
  }

  .print-generator-layout {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  .tool-layout {
    margin-top: 1rem;
    padding: 0 0.75rem;
  }

  .card-main {
    padding: 1.25rem;
  }

  .tool-tabs-nav {
    flex-direction: column;
  }

  .tool-tab-btn {
    width: 100%;
    justify-content: center;
  }

  .main-nav-buttons-row {
    grid-template-columns: 1fr;
  }

  .secondary-actions-row {
    flex-direction: column;
  }

  .btn-utility-action {
    width: 100%;
  }

  .pattern-swatches-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}