/* ==========================================================================
   Calculadora y simulador de par de apriete para tornillos y conversor de torque
   Estilos específicos de la herramienta
   ========================================================================== */

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

  /* Colores temáticos */
  --torque-accent: #2563eb;
  --torque-accent-hover: #1d4ed8;
  --torque-accent-light: rgba(37, 99, 235, 0.1);
  --torque-accent-border: rgba(37, 99, 235, 0.3);

  --torque-success: #10b981;
  --torque-success-light: rgba(16, 185, 129, 0.12);
  --torque-warning: #f59e0b;
  --torque-warning-light: rgba(245, 158, 11, 0.12);
  --torque-danger: #ef4444;
  --torque-danger-light: rgba(239, 68, 68, 0.12);

  /* Variables base del tema claro */
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --bg-subcard: #f1f5f9;
  --bg-subcard-hover: #e2e8f0;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --border-strong: #cbd5e1;
  --input-bg: #ffffff;
  --input-border: #cbd5e1;
  --shadow-sm: 0 1px 3px 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, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.08);
}

/* Modo oscuro */
[data-theme="dark"],
body.dark-mode {
  --bg-page: #0b0f17;
  --bg-card: #131b2a;
  --bg-subcard: #1a2436;
  --bg-subcard-hover: #223046;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: #24334a;
  --border-strong: #334766;
  --input-bg: #101725;
  --input-border: #2a3c56;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 20px -3px rgba(0, 0, 0, 0.5);
}

/* --------------------------------------------------------------------------
   Reset y layout corporativo
   -------------------------------------------------------------------------- */
body {
  margin: 0;
  padding: 0;
  font-family: var(--font-main);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.5;
  overflow-x: clip;
  width: 100%;
  max-width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

.bold {
  font-weight: 700;
}

.text-accent {
  color: var(--torque-accent) !important;
}

.text-success {
  color: var(--torque-success) !important;
}

.text-warning {
  color: var(--torque-warning) !important;
}

.text-danger {
  color: var(--torque-danger) !important;
}

.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 y pestañas
   -------------------------------------------------------------------------- */
.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
  padding: 1.75rem;
  margin-bottom: 2.5rem;
  box-sizing: border-box;
}

.tool-card-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.25rem;
  margin-bottom: 1.5rem;
}

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

.tool-card-title {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 0.4rem 0;
  color: var(--text-main);
}

.tool-card-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin: 0;
  max-width: 740px;
  line-height: 1.5;
}

.tool-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--torque-accent-light);
  color: var(--torque-accent);
  padding: 0.4rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
  border: 1px solid var(--torque-accent-border);
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--torque-success);
  display: inline-block;
  box-shadow: 0 0 8px var(--torque-success);
}

/* Pestañas */
.tool-tabs-nav {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.35rem;
  margin-top: 0.5rem;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.tool-tabs-nav::-webkit-scrollbar {
  height: 4px;
}

.tool-tabs-nav::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 4px;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-subcard);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  padding: 0.6rem 1rem;
  border-radius: 10px;
  font-family: var(--font-main);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
  min-height: 40px;
}

.tab-btn:hover {
  background: var(--bg-subcard-hover);
  color: var(--text-main);
}

.tab-btn.active {
  background: var(--torque-accent);
  color: #ffffff;
  border-color: var(--torque-accent);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.tab-panel {
  display: none;
  animation: fadeInTab 0.25s ease-out;
}

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

@keyframes fadeInTab {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --------------------------------------------------------------------------
   Controles y subtarjetas
   -------------------------------------------------------------------------- */
.tool-subcard {
  background: var(--bg-subcard);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  box-sizing: border-box;
}

.tool-subcard h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 0 0.4rem 0;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-main);
}

.panel-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0 0 1.25rem 0;
  line-height: 1.5;
}

.form-group {
  margin-bottom: 1.15rem;
}

.form-group label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.form-input {
  width: 100%;
  box-sizing: border-box;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 8px;
  padding: 0.65rem 0.85rem;
  font-family: var(--font-main);
  font-size: 0.95rem;
  color: var(--text-main);
  min-height: 42px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-input:focus {
  outline: none;
  border-color: var(--torque-accent);
  box-shadow: 0 0 0 3px var(--torque-accent-light);
}

.custom-select {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  box-sizing: border-box;
  background-color: var(--input-bg);
  color: var(--text-main);
  border: 1px solid var(--input-border);
  border-radius: 8px;
  padding: 0.65rem 40px 0.65rem 0.85rem;
  font-family: var(--font-main);
  font-size: 0.92rem;
  min-height: 42px;
  appearance: none;
  -webkit-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='%2364748b' 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 14px center;
  background-size: 16px;
  cursor: pointer;
  transition: border-color 0.2s;
}

.custom-select:focus {
  outline: none;
  border-color: var(--torque-accent);
  box-shadow: 0 0 0 3px var(--torque-accent-light);
}

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

.field-hint {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

/* --------------------------------------------------------------------------
   Pestaña 1: Calculadora principal
   -------------------------------------------------------------------------- */
.torque-calc-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 860px) {
  .torque-calc-grid {
    grid-template-columns: 1fr;
  }
}

.torque-hero-card {
  background: linear-gradient(145deg, var(--bg-card), var(--bg-subcard));
  border: 2px solid var(--torque-accent-border);
  border-radius: 14px;
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.hero-top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.65rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.hero-badge {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text-main);
}

.wrench-rec-badge {
  background: var(--torque-accent);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  white-space: nowrap;
}

.hero-display-box {
  text-align: center;
  padding: 1.25rem 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  margin-bottom: 1rem;
}

.hero-sublabel {
  display: block;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 0.4rem;
}

.hero-nm-value {
  font-size: 3.25rem;
  font-weight: 800;
  color: var(--torque-accent);
  line-height: 1.1;
}

.hero-alt-units {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-top: 0.4rem;
}

.torque-metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.t-metric-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.65rem 0.85rem;
}

.t-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}

.t-val {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.t-sub {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.lube-alert-box {
  display: flex;
  gap: 0.75rem;
  background: var(--torque-warning-light);
  border: 1px solid rgba(245, 158, 11, 0.4);
  border-radius: 10px;
  padding: 0.85rem 1rem;
  align-items: flex-start;
}

.lube-icon {
  color: var(--torque-warning);
  flex-shrink: 0;
  margin-top: 2px;
}

.lube-text strong {
  display: block;
  font-size: 0.88rem;
  color: var(--text-main);
  margin-bottom: 0.2rem;
}

.lube-text p {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   Pestaña 2: Conversor de unidades de torque
   -------------------------------------------------------------------------- */
.torque-converter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.t-conv-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1.15rem;
}

.t-conv-item label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.t-conv-input-wrap {
  display: flex;
  align-items: center;
  position: relative;
}

.t-conv-input-wrap .form-input {
  font-size: 1.25rem;
  font-weight: 700;
  padding-right: 58px;
}

.t-conv-unit {
  position: absolute;
  right: 12px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-muted);
  pointer-events: none;
}

.t-conv-desc {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
}

.conversion-factors-box h4 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  margin: 1.25rem 0 0.75rem 0;
  color: var(--text-main);
}

.factors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.85rem;
}

.factor-mini-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.85rem 1rem;
  font-size: 0.85rem;
}

.factor-mini-card strong {
  display: block;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.factor-mini-card ul {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--text-muted);
}

.factor-mini-card li {
  margin-bottom: 0.25rem;
}

/* --------------------------------------------------------------------------
   Pestaña 3: Simulador de fricción y lubricación
   -------------------------------------------------------------------------- */
.friction-comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.f-col-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  box-sizing: border-box;
}

.f-col-card.dry { border-top: 4px solid var(--torque-accent); }
.f-col-card.oiled { border-top: 4px solid var(--torque-success); }
.f-col-card.copper { border-top: 4px solid var(--torque-warning); }
.f-col-card.zinc { border-top: 4px solid #64748b; }

.f-badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  background: var(--bg-subcard);
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.f-col-card h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin: 0 0 0.35rem 0;
  color: var(--text-main);
}

.f-col-card p {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin: 0 0 0.85rem 0;
  line-height: 1.4;
  min-height: 48px;
}

.f-torque-val {
  font-size: 1.85rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.1;
}

.f-sub {
  display: block;
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-top: 0.3rem;
  font-weight: 600;
}

.friction-warning-note {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--torque-danger);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  font-size: 0.88rem;
}

.friction-warning-note strong {
  display: block;
  color: var(--torque-danger);
  margin-bottom: 0.35rem;
}

.friction-warning-note p {
  margin: 0;
  color: var(--text-muted);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   Pestaña 4: Tabla ISO 898-1
   -------------------------------------------------------------------------- */
.table-header-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.table-filter-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.table-filter-group label {
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
}

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

.iso-torque-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  background: var(--bg-card);
  border-radius: 8px;
  overflow: hidden;
}

.iso-torque-table th,
.iso-torque-table td {
  padding: 0.65rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.iso-torque-table th {
  background: var(--bg-subcard);
  color: var(--text-muted);
  font-weight: 600;
  white-space: nowrap;
}

.iso-torque-table tr:hover {
  background: var(--bg-subcard);
}

/* --------------------------------------------------------------------------
   Pestaña 5: Presets de taller
   -------------------------------------------------------------------------- */
.presets-gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.preset-card-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.15s, border-color 0.15s;
}

.preset-card-item:hover {
  border-color: var(--torque-accent);
  transform: translateY(-2px);
}

.p-card-header {
  margin-bottom: 0.5rem;
}

.p-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.35rem;
}

.p-tag.auto { background: rgba(37, 99, 235, 0.15); color: #2563eb; }
.p-tag.moto { background: rgba(245, 158, 11, 0.15); color: #d97706; }
.p-tag.bici { background: rgba(16, 185, 129, 0.15); color: #059669; }

.preset-card-item h4 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0;
  color: var(--text-main);
}

.p-card-torque {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--torque-accent);
  margin: 0.65rem 0 0.4rem 0;
}

.preset-card-item p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin: 0 0 1rem 0;
  flex-grow: 1;
}

.btn-load-preset {
  background: var(--bg-subcard);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.55rem 0.85rem;
  border-radius: 6px;
  font-family: var(--font-main);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  width: 100%;
}

.btn-load-preset:hover {
  background: var(--torque-accent);
  color: #ffffff;
  border-color: var(--torque-accent);
}

/* --------------------------------------------------------------------------
   Pestaña 6: Memoria técnica y exportación
   -------------------------------------------------------------------------- */
.report-header-flex {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1rem;
}

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

.btn-action-icon {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0.55rem 0.9rem;
  border-radius: 8px;
  font-family: var(--font-main);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  min-height: 40px;
}

.btn-action-icon:hover {
  background: var(--bg-subcard-hover);
  border-color: var(--border-strong);
}

.project-title-input-row label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.report-textarea {
  width: 100%;
  height: 280px;
  box-sizing: border-box;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 8px;
  padding: 1rem;
  font-size: 0.88rem;
  color: var(--text-main);
  line-height: 1.5;
  resize: vertical;
}

/* --------------------------------------------------------------------------
   Sección SEO, guías y FAQ acordeón
   -------------------------------------------------------------------------- */
.seo-guide-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  margin-top: 2.5rem;
  margin-bottom: 2.5rem;
  box-sizing: border-box;
}

.seo-guide-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1.25rem;
  margin-bottom: 1.5rem;
}

.seo-guide-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0 0 0.5rem 0;
  color: var(--text-main);
}

.seo-guide-subtitle {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}

.seo-guide-content h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  margin: 1.5rem 0 0.6rem 0;
  color: var(--text-main);
}

.seo-guide-content p {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0 0 1rem 0;
}

.seo-guide-content ul {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0 0 1rem 0;
  padding-left: 1.4rem;
}

.seo-guide-content li {
  margin-bottom: 0.5rem;
}

.formula-box {
  background: var(--bg-subcard);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.85rem 1.2rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--torque-accent);
  margin: 1rem 0;
  overflow-x: auto;
}

/* Acordeón FAQ */
.seo-faq-accordion {
  margin-top: 2rem;
  border-top: 1px solid var(--border-color);
  padding-top: 1rem;
}

.seo-faq-item {
  border-bottom: 1px solid var(--border-color);
}

.seo-faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-main);
  cursor: pointer;
  list-style: none;
  user-select: none;
}

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

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

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

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

.seo-faq-answer p {
  margin: 0;
}

/* --------------------------------------------------------------------------
   Modal accesible
   -------------------------------------------------------------------------- */
.custom-modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  box-sizing: border-box;
}

.custom-modal-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  width: 100%;
  max-width: 440px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modalScaleUp 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

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

.btn-close-modal {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  padding: 0;
}

.modal-body {
  padding: 1.25rem;
  font-size: 0.92rem;
  color: var(--text-main);
  line-height: 1.5;
}

.modal-footer {
  padding: 0.85rem 1.25rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  background: var(--bg-subcard);
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 640px) {
  .tool-card {
    padding: 1.15rem;
    border-radius: 12px;
  }

  .tool-title-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-nm-value {
    font-size: 2.5rem;
  }

  .torque-metrics-grid {
    grid-template-columns: 1fr;
  }

  .torque-converter-grid {
    grid-template-columns: 1fr;
  }

  .friction-comparison-grid {
    grid-template-columns: 1fr;
  }
}