/* ==========================================================================
   Calculadora Eléctrica y Caída de Tensión - Fijate Tools
   Estilos CSS con sistema de variables, soporte tema claro/oscuro y diseño responsivo
   ========================================================================== */

:root,
[data-theme="dark"] {
  color-scheme: dark;
  --bg-page: #080c14;
  --bg-surface: #0f172a;
  --bg-card: #131d31;
  --bg-card-hover: #1a2742;
  --bg-input: #0b1322;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-focus: #00e5ff;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --accent-cyan: #00e5ff;
  --accent-cyan-rgb: 0, 229, 255;
  --accent-amber: #ff8507;
  --accent-amber-rgb: 255, 133, 7;
  --accent-emerald: #10b981;
  --accent-emerald-rgb: 16, 185, 129;
  --accent-rose: #f43f5e;
  
  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.4), 0 2px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 25px rgba(0, 229, 255, 0.15);
  
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-heading: 'Outfit', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

[data-theme="light"] {
  color-scheme: light;
  --bg-page: #f1f5f9;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-input: #f8fafc;
  --border-color: #cbd5e1;
  --border-color-focus: #0284c7;
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;
  
  --accent-cyan: #0284c7;
  --accent-cyan-rgb: 2, 132, 199;
  --accent-amber: #d97706;
  --accent-amber-rgb: 217, 119, 6;
  --accent-emerald: #059669;
  --accent-emerald-rgb: 5, 150, 105;
  --accent-rose: #e11d48;
  
  --shadow-card: 0 4px 16px -2px rgba(15, 23, 42, 0.08), 0 2px 4px -1px rgba(15, 23, 42, 0.04);
  --shadow-glow: 0 0 20px rgba(2, 132, 199, 0.12);
}

/* Reset básico */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: clip;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Tipografía de cabeceras */
h1, h2, h3, h4, .brand-title, .card-section-title {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
}

/* Contenedor principal con soporte para anchos de pantalla >= 1536px */
.main-wrapper {
  width: 100% !important;
  max-width: 1320px !important;
  margin: 0 auto !important;
  padding: 24px 16px 40px;
  flex: 1;
  box-sizing: border-box;
}

.tool-with-sidebar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 24px;
  align-items: start;
  width: 100%;
}

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

/* Publicidad */
.tools-ad-banner-section {
  margin-bottom: 20px;
  width: 100%;
}

.ad-banner-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
}

.ad-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.ad-banner-card {
  width: 100%;
  min-height: 90px;
  background: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tool-ad-sidebar {
  width: 300px;
  height: auto;
  align-self: stretch;
}

.ad-sticky-box {
  position: sticky;
  top: 85px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.ad-unit-card {
  width: 300px;
  min-height: 600px;
  background: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Hero Section */
.tool-hero {
  margin-bottom: 24px;
}

.tool-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 9999px;
  background: rgba(var(--accent-amber-rgb), 0.12);
  color: var(--accent-amber);
  border: 1px solid rgba(var(--accent-amber-rgb), 0.25);
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.tool-hero h2 {
  font-size: 1.75rem;
  color: var(--text-main);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}

.tool-hero p {
  color: var(--text-muted);
  font-size: 0.98rem;
  max-width: 780px;
}

/* Pestañas de Navegación */
.tool-nav-tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 12px;
  margin-bottom: 20px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s ease;
  min-height: 42px;
  user-select: none;
}

.tab-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-main);
  border-color: rgba(var(--accent-cyan-rgb), 0.3);
}

.tab-btn.active {
  background: linear-gradient(135deg, rgba(var(--accent-cyan-rgb), 0.15), rgba(var(--accent-cyan-rgb), 0.05));
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  box-shadow: 0 0 16px rgba(var(--accent-cyan-rgb), 0.15);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.25s ease;
}

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

/* Tarjeta de Cálculo Principal */
.calc-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 24px;
  box-shadow: var(--shadow-card);
  margin-bottom: 24px;
}

.section-title-wrap {
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 14px;
}

.card-section-title {
  font-size: 1.25rem;
  color: var(--text-main);
  margin-bottom: 4px;
}

.section-subtext {
  font-size: 0.86rem;
  color: var(--text-muted);
}

/* Formularios e Inputs */
.form-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.form-group-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.field-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
}

.input-field-wrap {
  display: flex;
  align-items: stretch;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
  min-height: 42px;
}

.input-field-wrap:focus-within {
  border-color: var(--border-color-focus);
  box-shadow: 0 0 0 2px rgba(var(--accent-cyan-rgb), 0.2);
}

.form-input {
  flex: 1 1 0%;
  width: 0;
  min-width: 0;
  background: transparent;
  border: none;
  padding: 8px 12px;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 500;
  outline: none;
  min-height: 40px;
}

.form-select {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px 12px;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 500;
  outline: none;
  min-height: 42px;
  cursor: pointer;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-select:focus {
  border-color: var(--border-color-focus);
  box-shadow: 0 0 0 2px rgba(var(--accent-cyan-rgb), 0.2);
}

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

.unit-suffix {
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  background: rgba(255, 255, 255, 0.04);
  border-left: 1px solid var(--border-color);
  color: var(--text-dim);
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
  user-select: none;
}

.unit-select {
  background: rgba(255, 255, 255, 0.04);
  border: none;
  border-left: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 0 10px;
  font-size: 0.82rem;
  font-weight: 600;
  outline: none;
  cursor: pointer;
}

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

/* Botones de acción */
.btn-primary-full,
.btn-secondary-full {
  width: 100%;
  min-height: 42px;
  padding: 10px 16px;
  border-radius: 8px;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-primary-full {
  background: linear-gradient(135deg, var(--accent-amber), #e06f00);
  border: 1px solid #ff9d33;
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(var(--accent-amber-rgb), 0.3);
}

.btn-primary-full:hover {
  background: linear-gradient(135deg, #ff9520, #e06f00);
  box-shadow: 0 4px 16px rgba(var(--accent-amber-rgb), 0.4);
}

.btn-secondary-full {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
}

.btn-secondary-full:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
}

.btn-row-flex {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.btn-align-bottom {
  justify-content: flex-end;
}

/* Panel de Resultados Caída de Tensión */
.results-banner {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.res-card-highlight {
  background: linear-gradient(145deg, rgba(var(--accent-cyan-rgb), 0.12), rgba(var(--accent-cyan-rgb), 0.03));
  border: 1px solid rgba(var(--accent-cyan-rgb), 0.35);
  border-radius: 12px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  box-shadow: var(--shadow-glow);
}

.res-badge-status {
  position: absolute;
  top: 14px;
  right: 14px;
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: rgba(var(--accent-emerald-rgb), 0.15);
  color: var(--accent-emerald);
  border: 1px solid rgba(var(--accent-emerald-rgb), 0.3);
}

.res-badge-status.warning {
  background: rgba(var(--accent-rose), 0.15);
  color: var(--accent-rose);
  border-color: rgba(244, 63, 94, 0.3);
}

.res-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.res-value-hero {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--accent-cyan);
  line-height: 1.1;
  margin-bottom: 8px;
}

.res-subtext {
  font-size: 0.78rem;
  color: var(--text-dim);
  line-height: 1.35;
}

.res-grid-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.metric-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.metric-label {
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 4px;
}

.metric-val {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.metric-tag {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-amber);
}

.metric-sub {
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-top: 2px;
}

/* Tabla de datos de secciones */
.commercial-table-wrap {
  margin-top: 16px;
}

.table-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  text-align: left;
}

.data-table th {
  background: var(--bg-surface);
  color: var(--text-muted);
  font-weight: 600;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table td {
  padding: 8px 12px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
  white-space: nowrap;
}

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

.data-table tr.row-recommended {
  background: rgba(var(--accent-cyan-rgb), 0.08);
  font-weight: 600;
}

.data-table tr.row-recommended td {
  color: var(--accent-cyan);
}

.badge-tag-pass {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  background: rgba(var(--accent-emerald-rgb), 0.15);
  color: var(--accent-emerald);
}

.badge-tag-fail {
  display: inline-block;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 700;
  background: rgba(244, 63, 94, 0.15);
  color: var(--accent-rose);
}

/* ==========================================
   Módulo 2: Ley de Ohm
   ========================================== */
.ohm-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}

.ohm-input-box {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.ohm-visual-box {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.ohm-formula-display {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
}

.formula-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 10px;
}

.formula-body {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-main);
  line-height: 1.6;
}

.ohm-wheel-mini-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.ohm-metric-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 14px;
  position: relative;
  transition: all 0.2s ease;
}

.ohm-metric-card.calculated {
  border-color: rgba(var(--accent-cyan-rgb), 0.4);
  background: rgba(var(--accent-cyan-rgb), 0.05);
}

.ohm-metric-letter {
  position: absolute;
  top: 10px;
  right: 12px;
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-dim);
}

.ohm-metric-name {
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--text-dim);
  display: block;
  margin-bottom: 4px;
}

.ohm-metric-val {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

/* ==========================================
   Módulo 3: Resistencias
   ========================================== */
.bands-selector-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

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

.bands-toggle-group {
  display: inline-flex;
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 3px;
  gap: 4px;
}

.band-tab-btn {
  background: transparent;
  border: none;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
}

.band-tab-btn.active {
  background: var(--bg-card-hover);
  color: var(--accent-cyan);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.resistor-canvas-wrapper {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.resistor-graphic-svg-wrap {
  width: 100%;
  max-width: 480px;
  margin-bottom: 16px;
}

.resistor-svg {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.4));
}

.resistor-result-banner {
  text-align: center;
}

.resistor-val-main {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--accent-cyan);
  line-height: 1.1;
  margin-bottom: 4px;
}

.resistor-val-sub {
  font-size: 0.86rem;
  color: var(--text-muted);
}

.resistor-val-temp {
  font-size: 0.78rem;
  color: var(--accent-amber);
  margin-top: 4px;
}

.resistor-band-selectors {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.band-control-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.band-control-title {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-dim);
}

.inverse-resistor-wrap {
  border-top: 1px solid var(--border-color);
  padding-top: 20px;
}

.inverse-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.inverse-grid {
  display: grid;
  grid-template-columns: 1.5fr 1.2fr 1fr;
  gap: 14px;
  align-items: flex-end;
}

/* ==========================================
   Módulo 4: Consumo y Coste
   ========================================== */
.preset-devices-bar {
  margin-bottom: 20px;
}

.preset-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  display: block;
  margin-bottom: 8px;
}

.preset-pills-row {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: thin;
}

.preset-pill {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 6px 12px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.2s ease;
}

.preset-pill:hover {
  background: var(--bg-card-hover);
  color: var(--text-main);
  border-color: var(--accent-amber);
}

.cost-summary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.cost-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
  text-align: center;
}

.cost-card.highlight {
  background: linear-gradient(145deg, rgba(var(--accent-amber-rgb), 0.12), rgba(var(--accent-amber-rgb), 0.02));
  border-color: rgba(var(--accent-amber-rgb), 0.35);
}

.cost-period {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
  display: block;
}

.cost-val {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-amber);
  line-height: 1.1;
  margin-bottom: 4px;
}

.cost-kwh {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ==========================================
   Módulo 5: Conversor y Potencia
   ========================================== */
.converter-box-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.conv-column {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 18px;
}

.conv-col-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
}

.conv-results-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}

.conv-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px;
  background: var(--bg-card);
  border-radius: 6px;
  border: 1px solid var(--border-color);
}

.conv-item-label {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.conv-item-val {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
}

.pf-results-card {
  background: var(--bg-card);
  border: 1px solid rgba(var(--accent-emerald-rgb), 0.3);
  border-radius: 10px;
  padding: 16px;
  margin-top: 16px;
}

.pf-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 4px;
  display: block;
}

.pf-val {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--accent-emerald);
  margin-bottom: 4px;
}

.pf-sub {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ==========================================
   Sección Educativa (SEO)
   ========================================== */
.percent-edu-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
}

.edu-card h4 {
  font-size: 1rem;
  color: var(--text-main);
  margin-bottom: 10px;
}

.edu-card p {
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 8px;
}

.edu-card p:last-child {
  margin-bottom: 0;
}

.edu-card code {
  font-family: var(--font-mono);
  background: rgba(255, 255, 255, 0.06);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--accent-cyan);
  font-size: 0.82rem;
}

/* ==========================================
   Adaptabilidad Móvil (Responsive)
   ========================================== */
@media (max-width: 1024px) {
  .tool-with-sidebar {
    grid-template-columns: 1fr;
  }
  .tool-ad-sidebar {
    width: 100%;
    margin-top: 20px;
  }
  .ad-unit-card {
    width: 100%;
    min-height: 250px;
    height: auto;
  }
}

@media (max-width: 768px) {
  .main-wrapper {
    padding: 16px 12px 32px;
  }

  .form-grid-3 {
    grid-template-columns: 1fr;
  }

  .results-banner {
    grid-template-columns: 1fr;
  }

  .ohm-grid,
  .converter-box-grid,
  .percent-edu-grid {
    grid-template-columns: 1fr;
  }

  .cost-summary-grid {
    grid-template-columns: 1fr;
  }

  .resistor-band-selectors {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .inverse-grid {
    grid-template-columns: 1fr;
  }

  .res-value-hero {
    font-size: 1.85rem;
  }

  .resistor-val-main {
    font-size: 1.6rem;
  }
}