:root {
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Outfit', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Colores tema oscuro (predeterminado) */
  --bg-page: #0b0f17;
  --bg-card: #111827;
  --bg-card-hover: #1f2937;
  --bg-subtle: #1e293b;
  --bg-input: #0f172a;

  --accent-primary: #3b82f6;
  --accent-hover: #2563eb;
  --accent-emerald: #10b981;
  --accent-lime: #84cc16;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --accent-indigo: #6366f1;

  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --border-subtle: #1e293b;
  --border-card: #334155;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;

  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.4);
}

[data-theme="light"] {
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-subtle: #f8fafc;
  --bg-input: #ffffff;

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;
  --border-subtle: #e2e8f0;
  --border-card: #cbd5e1;

  --shadow-card: 0 4px 18px -2px rgba(0, 0, 0, 0.07);
}

/* Base y contención */
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-page);
  color: var(--text-main);
  margin: 0;
  padding: 0;
  overflow-x: clip;
  width: 100%;
  max-width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6,
.brand-title,
.section-title,
.card-title,
.distance-title,
.simulator-title,
.matrix-title,
.faq-section-title {
  font-family: var(--font-heading);
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Layout canónico */
.tool-layout {
  max-width: 1200px;
  margin: 1.5rem auto 3rem;
  padding: 0 1rem;
  box-sizing: border-box;
  flex: 1 0 auto;
  width: 100%;
}

.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: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
  margin-bottom: 2rem;
}

@media (max-width: 768px) {
  .card-main {
    padding: 1.25rem 1rem;
    border-radius: var(--radius-lg);
  }
}

.card-header {
  margin-bottom: 1.5rem;
}

.card-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 0 0 0.5rem;
  line-height: 1.3;
}

.card-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}

/* Pestañas de modo de cálculo */
.calc-tabs {
  display: flex;
  gap: 0.5rem;
  background: var(--bg-subtle);
  padding: 0.35rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  overflow-x: auto;
  scrollbar-width: none;
}

.calc-tabs::-webkit-scrollbar {
  display: none;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
  min-height: 40px;
}

.tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.05);
}

.tab-btn.active {
  color: #ffffff;
  background: var(--accent-primary);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.35);
}

/* Paneles de pestañas */
.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

/* Cuadrículas de inputs */
.inputs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

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

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-field,
.select-field {
  width: 100%;
  min-width: 0;
  height: 44px;
  padding: 0.5rem 0.85rem;
  font-family: var(--font-main);
  font-size: 1rem;
  color: var(--text-main);
  background: var(--bg-input);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-field.mono {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.05rem;
}

.input-field:focus,
.select-field:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.input-wrapper .input-field {
  padding-right: 48px;
}

.input-suffix {
  position: absolute;
  right: 12px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dim);
  pointer-events: none;
}

.inline-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  height: 44px;
}

.btn-action-sm {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.85rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  min-height: 40px;
  transition: all 0.2s;
}

.btn-action-sm:hover {
  background: var(--border-subtle);
  border-color: var(--accent-primary);
}

.badge-ratio {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.75rem;
  background: rgba(59, 130, 246, 0.12);
  color: var(--accent-primary);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 700;
}

/* Selectores */
.select-field {
  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='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
  cursor: pointer;
}

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

.calculated-preview {
  display: flex;
  align-items: center;
  height: 44px;
  padding: 0 1rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-primary);
}

/* Chips de presets */
.presets-container {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.presets-title {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-weight: 600;
}

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

.chip-preset {
  padding: 0.4rem 0.8rem;
  font-family: var(--font-main);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border-card);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s;
  min-height: 36px;
}

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

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

/* Dropzone de subida local */
.upload-dropzone {
  border: 2px dashed var(--border-card);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.5rem;
  text-align: center;
  background: var(--bg-subtle);
  cursor: pointer;
  transition: all 0.25s ease;
}

.upload-dropzone:hover,
.upload-dropzone.dragover {
  border-color: var(--accent-primary);
  background: rgba(59, 130, 246, 0.05);
}

.file-input-hidden {
  display: none;
}

.dropzone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.dropzone-icon {
  color: var(--accent-primary);
}

.dropzone-text {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.dropzone-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-main);
}

.btn-browse-link {
  background: none;
  border: none;
  padding: 0;
  color: var(--accent-primary);
  font-weight: 700;
  text-decoration: underline;
  cursor: pointer;
  font-size: inherit;
}

.dropzone-subtitle {
  font-size: 0.85rem;
  color: var(--text-dim);
}

.uploaded-file-meta {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1rem 1.25rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  margin-top: 1rem;
}

.file-thumb-container {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #000;
  flex-shrink: 0;
}

.file-thumb-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.file-info-box {
  flex: 1;
  min-width: 0;
}

.file-name {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-specs {
  font-size: 0.85rem;
  color: var(--accent-primary);
  font-weight: 700;
  margin: 0.2rem 0;
}

.file-status-tag {
  font-size: 0.75rem;
  color: var(--accent-emerald);
}

.btn-remove-file {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(244, 63, 94, 0.12);
  border: none;
  color: var(--accent-rose);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.btn-remove-file:hover {
  background: var(--accent-rose);
  color: #fff;
}

/* Modo inverso */
.inline-inputs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.inline-sep {
  font-weight: 700;
  color: var(--text-dim);
}

.reverse-result-banner {
  margin-top: 1.25rem;
  padding: 1.25rem;
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.25);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.reverse-result-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
}

.reverse-kpis {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
}

.reverse-kpi-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.reverse-kpi-val {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent-primary);
}

.reverse-kpi-lbl {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.btn-use-calculated {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  background: var(--accent-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-use-calculated:hover {
  background: var(--accent-hover);
}

/* Control de distancia */
.distance-control-section {
  margin: 2rem 0;
  padding: 1.5rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
}

.distance-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.distance-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 0 0 0.25rem;
}

.distance-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}

.distance-display-badge {
  text-align: right;
  flex-shrink: 0;
}

.distance-val {
  display: block;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent-primary);
  line-height: 1.2;
}

.distance-sub {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.slider-row {
  margin: 0.75rem 0 1.25rem;
}

.distance-slider {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: var(--border-card);
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
}

.distance-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-primary);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  cursor: pointer;
  border: 2px solid #ffffff;
  transition: transform 0.15s ease;
}

.distance-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.distance-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.chip-dist {
  padding: 0.35rem 0.75rem;
  font-family: var(--font-main);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s;
  min-height: 36px;
}

.chip-dist:hover {
  border-color: var(--accent-primary);
  color: var(--text-main);
}

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

.snellen-formula-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-md);
}

.snellen-info {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-main);
}

.snellen-info svg {
  color: var(--accent-emerald);
  flex-shrink: 0;
}

.snellen-badge {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--accent-emerald);
  padding: 0.25rem 0.75rem;
  background: rgba(16, 185, 129, 0.15);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

/* Tarjetas Bento de resultados */
.results-bento-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.bento-card {
  padding: 1.35rem;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s, box-shadow 0.2s;
  position: relative;
  overflow: hidden;
}

.bento-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.2);
}

.bento-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
}

.bento-optimal::before { background: var(--accent-emerald); }
.bento-good::before { background: var(--accent-primary); }
.bento-fair::before { background: var(--accent-amber); }
.bento-custom::before { background: var(--accent-indigo); }

.bento-badge {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

.bento-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.bento-dpi {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-main);
}

.bento-tag {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
  color: var(--text-muted);
}

.bento-optimal .bento-tag { background: rgba(16, 185, 129, 0.15); color: var(--accent-emerald); }
.bento-good .bento-tag { background: rgba(59, 130, 246, 0.15); color: var(--accent-primary); }
.bento-fair .bento-tag { background: rgba(245, 158, 11, 0.15); color: var(--accent-amber); }
.bento-custom .bento-tag { background: rgba(99, 102, 241, 0.15); color: var(--accent-indigo); }

.bento-size {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.3;
  margin-bottom: 0.2rem;
}

.bento-size-in {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 0.75rem;
}

.bento-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-top: auto;
}

/* Simulador de marco y encuadre */
.frame-simulator-section {
  background: var(--bg-subtle);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.simulator-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.simulator-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 0 0 0.25rem;
}

.simulator-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}

.select-frame-sm {
  min-height: 40px;
  padding: 0.4rem 2rem 0.4rem 0.85rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  background-color: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  cursor: pointer;
}

.simulator-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  align-items: center;
}

@media (max-width: 820px) {
  .simulator-body {
    grid-template-columns: 1fr;
  }
}

.canvas-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.frame-canvas {
  width: 100%;
  max-width: 440px;
  height: auto;
  aspect-ratio: 500 / 340;
  display: block;
}

.simulator-metrics {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.metric-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border-card);
  font-size: 0.9rem;
}

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

.metric-val {
  font-weight: 700;
  color: var(--text-main);
}

.metric-badge {
  font-size: 0.8rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
}

.sim-advice-box {
  margin-top: 0.5rem;
  padding: 0.85rem;
  background: rgba(59, 130, 246, 0.08);
  border-left: 3px solid var(--accent-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.85rem;
  color: var(--text-main);
  line-height: 1.4;
}

/* Semáforos de calidad */
.status-optimal {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
}

.status-good {
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-primary);
}

.status-fair {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
}

.status-poor {
  background: rgba(244, 63, 94, 0.15);
  color: var(--accent-rose);
}

/* Matriz comparativa */
.matrix-section {
  margin-bottom: 2rem;
}

.matrix-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.matrix-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 0 0 0.25rem;
}

.matrix-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}

.matrix-filters {
  display: flex;
  gap: 0.4rem;
}

.btn-filter-tag {
  padding: 0.35rem 0.75rem;
  font-family: var(--font-main);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-sm);
  cursor: pointer;
  min-height: 36px;
  transition: all 0.2s;
}

.btn-filter-tag:hover {
  color: var(--text-main);
}

.btn-filter-tag.active {
  color: #fff;
  background: var(--accent-primary);
  border-color: var(--accent-primary);
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
}

.table-matrix {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.table-matrix th {
  background: var(--bg-subtle);
  padding: 0.85rem 1rem;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-card);
  white-space: nowrap;
}

.table-matrix td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-card);
  color: var(--text-main);
  white-space: nowrap;
}

.table-matrix tr:last-child td {
  border-bottom: none;
}

.table-matrix tr:hover td {
  background: var(--bg-card-hover);
}

.format-name {
  font-weight: 700;
  color: var(--text-main);
}

.format-cat {
  font-size: 0.75rem;
  color: var(--text-dim);
  display: block;
}

.matrix-legend {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 0.85rem;
  flex-wrap: wrap;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.legend-title {
  font-weight: 600;
}

.legend-items {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.legend-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.dot-status {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.dot-optimal { background: var(--accent-emerald); }
.dot-good { background: var(--accent-primary); }
.dot-fair { background: var(--accent-amber); }
.dot-poor { background: var(--accent-rose); }

/* Acciones finales */
.actions-footer-bar {
  display: flex;
  justify-content: flex-end;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-card);
}

.btn-primary-action {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1.4rem;
  background: var(--accent-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  min-height: 44px;
  transition: all 0.2s ease;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

.btn-primary-action:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

/* Guía didáctica y FAQ */
.seo-guide-section {
  margin: 3rem 0;
}

.section-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 0 0 1.25rem;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}

.guide-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.4rem;
  box-shadow: var(--shadow-card);
}

.guide-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 0 0 0.6rem;
}

.guide-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin: 0;
}

.faq-section-title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
  margin: 2rem 0 1rem;
}

.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s;
}

.faq-item[open] {
  border-color: var(--accent-primary);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-arrow {
  color: var(--text-dim);
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.faq-item[open] .faq-arrow {
  transform: rotate(180deg);
  color: var(--accent-primary);
}

.faq-answer {
  padding: 0 1.25rem 1.25rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.faq-answer p {
  margin: 0;
}

/* Modal accesible */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 9999;
}

.modal-container {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-xl);
  max-width: 620px;
  width: 100%;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  max-height: 90vh;
  overflow: hidden;
  animation: modalIn 0.2s ease-out;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-card);
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0;
  color: var(--text-main);
}

.btn-close-modal {
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s;
}

.btn-close-modal:hover {
  color: var(--text-main);
}

.modal-body {
  padding: 1.5rem;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.modal-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}

.report-box {
  background: var(--bg-subtle);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 1rem;
  max-height: 280px;
  overflow-y: auto;
}

.report-code {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-main);
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

.modal-status-feedback {
  padding: 0.6rem 0.85rem;
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-card);
}

.btn-secondary {
  padding: 0.6rem 1rem;
  background: var(--bg-subtle);
  color: var(--text-main);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  min-height: 40px;
  transition: all 0.2s;
}

.btn-secondary:hover {
  background: var(--border-card);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  background: var(--accent-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  min-height: 40px;
  transition: background 0.2s;
}

.btn-primary:hover {
  background: var(--accent-hover);
}