/* ==========================================================================
   Fijate Tools - Simulador Cuántico de la Doble Rendija y Colapso de Onda
   Estilos Canónicos y Paleta Cuántica Midnight Slate
   ========================================================================== */

:root {
  --font-main: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-heading: 'Outfit', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Paleta Cuántica Modo Oscuro (Predeterminado) */
  --bg-page: #07090e;
  --bg-card: #0d121d;
  --bg-card-subtle: #121926;
  --bg-input: #182234;
  --border-color: #1e293b;
  --border-focus: #00f5ff;

  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --primary-color: #00f5ff;
  --primary-glow: rgba(0, 245, 255, 0.25);
  --primary-light: rgba(0, 245, 255, 0.12);

  --accent-purple: #8b5cf6;
  --accent-purple-glow: rgba(139, 92, 246, 0.25);
  --accent-amber: #f59e0b;
  --accent-amber-glow: rgba(245, 158, 11, 0.28);
  --accent-rose: #f43f5e;
  --accent-emerald: #10b981;

  --color-phosphor: #00f5ff;
  --color-phosphor-glow: rgba(0, 245, 255, 0.6);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 22px;

  --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 20px rgba(0, 245, 255, 0.18);
  --transition-normal: 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Modo Claro Canónico */
[data-theme="light"],
body.light-theme {
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-subtle: #f1f5f9;
  --bg-input: #f8fafc;
  --border-color: #e2e8f0;
  --border-focus: #0284c7;

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;

  --primary-color: #0284c7;
  --primary-glow: rgba(2, 132, 199, 0.2);
  --primary-light: rgba(2, 132, 199, 0.1);

  --accent-purple: #7c3aed;
  --accent-purple-glow: rgba(124, 58, 237, 0.2);
  --accent-amber: #d97706;
  --accent-amber-glow: rgba(217, 119, 6, 0.2);
  --accent-rose: #e11d48;
  --accent-emerald: #059669;

  --color-phosphor: #0284c7;
  --color-phosphor-glow: rgba(2, 132, 199, 0.4);

  --shadow-card: 0 4px 20px rgba(15, 23, 42, 0.08);
  --shadow-glow: 0 0 15px rgba(2, 132, 199, 0.12);
}

/* Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

h1, h2, h3, h4, h5, h6,
.brand-title,
.section-title,
.panel-card-title {
  font-family: var(--font-heading);
  letter-spacing: -0.02em;
}

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

/* Sincronización de caja de logo temático con cabecera */
.brand-logo-box {
  background: linear-gradient(135deg, rgba(0, 245, 255, 0.18), rgba(139, 92, 246, 0.24));
  border: 1px solid rgba(0, 245, 255, 0.35);
  color: var(--primary-color);
  box-shadow: 0 0 16px rgba(0, 245, 255, 0.2);
}

/* Card principal */
.quantum-workbench {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

@media (max-width: 768px) {
  .quantum-workbench {
    padding: 1rem;
    gap: 1.25rem;
  }
}

/* ==========================================================================
   BANNER INTERACTIVO DEL OBSERVADOR CUÁNTICO
   ========================================================================== */
.quantum-observer-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(0, 245, 255, 0.06), rgba(139, 92, 246, 0.08));
  border: 1px solid rgba(0, 245, 255, 0.25);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.quantum-observer-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--primary-color);
  transition: background var(--transition-normal);
}

/* Estado cuando el sensor está ACTIVO (Colapso forzado) */
.quantum-observer-banner.observer-active {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.12), rgba(244, 63, 94, 0.1));
  border-color: rgba(245, 158, 11, 0.45);
  box-shadow: 0 0 25px rgba(245, 158, 11, 0.18);
}

.quantum-observer-banner.observer-active::before {
  background: var(--accent-amber);
}

.observer-content {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex: 1;
}

.observer-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 245, 255, 0.12);
  border: 1px solid rgba(0, 245, 255, 0.3);
  color: var(--primary-color);
  flex-shrink: 0;
  transition: all var(--transition-normal);
}

.observer-active .observer-icon-wrap {
  background: rgba(245, 158, 11, 0.18);
  border-color: rgba(245, 158, 11, 0.5);
  color: var(--accent-amber);
  box-shadow: 0 0 18px rgba(245, 158, 11, 0.35);
  animation: pulse-observer 2s infinite ease-in-out;
}

@keyframes pulse-observer {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.06); }
}

.observer-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.observer-title-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.observer-badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  background: rgba(0, 245, 255, 0.15);
  color: var(--primary-color);
  border: 1px solid rgba(0, 245, 255, 0.3);
}

.observer-active .observer-badge {
  background: rgba(245, 158, 11, 0.2);
  color: var(--accent-amber);
  border-color: rgba(245, 158, 11, 0.4);
}

.observer-status-text {
  font-weight: 700;
  font-size: 1rem;
  color: var(--text-main);
}

.observer-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin: 0;
}

.observer-action {
  flex-shrink: 0;
}

.btn-quantum-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  min-height: 48px;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  border: 1.5px solid var(--border-color);
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-quantum-toggle:hover {
  border-color: var(--primary-color);
  background: var(--bg-card-subtle);
}

.toggle-indicator {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--text-dim);
  box-shadow: none;
  transition: all var(--transition-normal);
}

.observer-active .btn-quantum-toggle {
  border-color: var(--accent-amber);
  background: rgba(245, 158, 11, 0.1);
  color: var(--accent-amber);
}

.observer-active .toggle-indicator {
  background: var(--accent-amber);
  box-shadow: 0 0 10px var(--accent-amber);
}

@media (max-width: 768px) {
  .quantum-observer-banner {
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
  }
  .btn-quantum-toggle {
    width: 100%;
    justify-content: center;
  }
}

/* ==========================================================================
   BARRA DE PRESETS HISTÓRICOS
   ========================================================================== */
.presets-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  padding: 0.75rem 1rem;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.presets-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-right: 0.25rem;
}

.presets-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  flex: 1;
}

.preset-pill {
  min-height: 38px;
  padding: 0.4rem 0.9rem;
  border-radius: 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.preset-pill:hover {
  color: var(--text-main);
  border-color: var(--primary-color);
  background: var(--primary-light);
}

.preset-pill.active {
  background: linear-gradient(135deg, rgba(0, 245, 255, 0.2), rgba(139, 92, 246, 0.2));
  color: var(--primary-color);
  border-color: var(--primary-color);
  font-weight: 600;
  box-shadow: 0 0 12px rgba(0, 245, 255, 0.2);
}

@media (max-width: 768px) {
  .presets-bar {
    flex-direction: column;
    align-items: stretch;
  }
  .presets-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.4rem;
  }
  .preset-pill {
    width: 100%;
    min-height: 40px;
    text-align: center;
    font-size: 0.76rem;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}

/* ==========================================================================
   CUADRÍCULA DE SIMULACIÓN Y PANELES (STAGE LAYOUT)
   ========================================================================== */
.simulation-stage-layout {
  display: grid;
  grid-template-columns: 1.55fr 1fr;
  gap: 1.25rem;
  align-items: start;
}

@media (max-width: 1100px) {
  .simulation-stage-layout {
    grid-template-columns: 1fr;
  }
}

/* Columna Canvas */
.canvas-panel {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.canvas-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.stage-labels {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.stage-tag {
  font-size: 0.72rem;
  padding: 0.25rem 0.5rem;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
}

.canvas-quick-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-canvas-tool {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  min-height: 34px;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-sm);
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-canvas-tool:hover {
  color: var(--text-main);
  border-color: var(--primary-color);
}

/* Contenedor del Canvas de simulación */
.quantum-canvas-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #04060a;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: inset 0 0 40px rgba(0, 0, 0, 0.8), var(--shadow-card);
}

#quantumCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Overlay animado de colapso */
.collapse-overlay-flash {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 45% 50%, rgba(245, 158, 11, 0.45), transparent 70%);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease-out;
}

.collapse-overlay-flash.flash {
  opacity: 1;
  transition: opacity 0.05s ease-in;
}

/* HUD sobreimpreso en el Canvas */
.canvas-hud-overlay {
  position: absolute;
  top: 12px;
  left: 12px;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.6rem 0.85rem;
  background: rgba(10, 15, 25, 0.75);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  pointer-events: none;
}

.hud-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
}

.hud-title {
  color: var(--text-dim);
}

.hud-val {
  color: var(--primary-color);
  font-weight: 600;
}

/* Barra de controles de emisión */
.emission-controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.85rem;
  padding: 0.85rem 1rem;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.emission-action-buttons {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  flex: 1;
}

.btn-action-primary,
.btn-action-success,
.btn-action-secondary,
.btn-action-danger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 42px;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  border: 1px solid transparent;
}

.btn-action-primary {
  background: var(--primary-color);
  color: #04060a;
  box-shadow: 0 2px 10px var(--primary-glow);
}

.btn-action-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.btn-action-success {
  background: #10b981;
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(16, 185, 129, 0.25);
}

.btn-action-success:hover {
  background: #059669;
  transform: translateY(-1px);
}

.btn-action-secondary {
  background: var(--bg-card);
  border-color: var(--border-color);
  color: var(--text-main);
}

.btn-action-secondary:hover {
  border-color: var(--text-muted);
  background: var(--bg-input);
}

.btn-action-danger {
  background: #ef4444;
  color: #ffffff;
}

.btn-action-danger:hover {
  background: #dc2626;
}

.rate-selector-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.rate-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
}

.rate-buttons {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  background: var(--bg-card);
  padding: 3px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.btn-rate-pill {
  min-height: 32px;
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-rate-pill:hover {
  color: var(--text-main);
}

.btn-rate-pill.active {
  background: var(--bg-card-subtle);
  color: var(--primary-color);
  border: 1px solid rgba(0, 245, 255, 0.3);
}

@media (max-width: 768px) {
  .emission-controls-bar {
    flex-direction: column;
    align-items: stretch;
  }
  .emission-action-buttons {
    display: flex;
    flex-direction: column;
    width: 100%;
  }
  .btn-action-primary,
  .btn-action-success,
  .btn-action-secondary {
    width: 100%;
    min-height: 44px;
  }
  .rate-selector-wrap {
    justify-content: space-between;
    width: 100%;
  }
  .rate-buttons {
    flex: 1;
    justify-content: space-around;
  }
}

/* ==========================================================================
   COLUMNA DERECHA: HISTOGRAMA Y PARÁMETROS
   ========================================================================== */
.controls-histogram-panel {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.panel-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.panel-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.card-title-group {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.panel-card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-main);
}

.panel-card-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Histograma */
.histogram-legend {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.72rem;
  color: var(--text-dim);
}

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

.legend-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.legend-dot.experimental {
  background: var(--primary-color);
  box-shadow: 0 0 6px var(--primary-glow);
}

.legend-dot.theoretical {
  background: #f43f5e;
}

.histogram-canvas-wrap {
  width: 100%;
  height: 140px;
  background: #04060a;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

#histogramCanvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Controles y Deslizadores */
.control-row {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

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

/* Select canónico con propiedades anti-ensanche obligatorias */
.quantum-select {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  min-height: 42px;
  padding: 0.5rem 2.5rem 0.5rem 0.85rem;
  border-radius: var(--radius-md);
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  font-family: var(--font-main);
  font-size: 0.85rem;
  cursor: pointer;
  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 0.85rem center;
  transition: all var(--transition-normal);
}

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

.quantum-select option {
  background: #0d121d;
  color: #f1f5f9;
}

[data-theme="light"] .quantum-select option,
body.light-theme .quantum-select option {
  background: #ffffff;
  color: #0f172a;
}

/* Sliders */
.slider-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.slider-val {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--primary-color);
}

.quantum-range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  outline: none;
  cursor: pointer;
  margin: 0.5rem 0;
}

.quantum-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary-color);
  box-shadow: 0 0 10px var(--primary-glow);
  cursor: pointer;
  border: 2px solid #0d121d;
  transition: transform 0.15s ease;
}

.quantum-range::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.slider-ticks {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.68rem;
  color: var(--text-dim);
}

/* Botones de conmutación de rendijas */
.slits-toggle-group {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
}

.btn-slit {
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-md);
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-dim);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-slit .slit-icon {
  width: 3px;
  height: 16px;
  background: var(--text-dim);
  border-radius: 2px;
  transition: background var(--transition-normal);
}

.btn-slit.active {
  background: rgba(0, 245, 255, 0.1);
  border-color: var(--primary-color);
  color: var(--text-main);
  font-weight: 600;
}

.btn-slit.active .slit-icon {
  background: var(--primary-color);
  box-shadow: 0 0 8px var(--primary-glow);
}

/* Telemetría */
.telemetry-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.6rem;
}

.telem-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.6rem 0.75rem;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.telem-label {
  font-size: 0.72rem;
  color: var(--text-dim);
}

.telem-val {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-main);
}

/* ==========================================================================
   SECCIONES EDUCATIVAS Y FAQ (SEO Y DIVULGACIÓN)
   ========================================================================== */
.quantum-education-section,
.quantum-faq-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

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

.quantum-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
}

@media (max-width: 768px) {
  .quantum-cards-grid {
    grid-template-columns: 1fr;
  }
}

.edu-card {
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  transition: border-color var(--transition-normal);
}

.edu-card.highlight {
  border-color: rgba(245, 158, 11, 0.4);
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.05), rgba(244, 63, 94, 0.03));
}

.edu-card:hover {
  border-color: var(--primary-color);
}

.edu-card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: rgba(0, 245, 255, 0.1);
  color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
}

.edu-card.highlight .edu-card-icon {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
}

.edu-card-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text-main);
}

.edu-card-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* Acordeón FAQ */
.faq-accordion-item {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card-subtle);
  overflow: hidden;
  transition: all var(--transition-normal);
}

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

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

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

.faq-question::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--text-dim);
  transition: transform var(--transition-normal);
}

.faq-accordion-item[open] .faq-question::after {
  content: '−';
  color: var(--primary-color);
}

.faq-answer {
  padding: 0 1.25rem 1rem;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   MODALES CANÓNICOS (SIN ALERTS)
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(4, 6, 10, 0.85);
  backdrop-filter: blur(10px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  animation: fadeIn 0.2s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-card {
  width: 100%;
  max-width: 620px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
  max-height: 90vh;
  overflow: hidden;
  animation: slideUp 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-card-sm {
  max-width: 440px;
}

@keyframes slideUp {
  from { transform: translateY(20px) scale(0.96); }
  to { transform: translateY(0) scale(1); }
}

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

.modal-title-group {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

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

.modal-subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.btn-modal-close {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-card-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-normal);
  flex-shrink: 0;
}

.btn-modal-close:hover {
  color: var(--text-main);
  border-color: var(--accent-rose);
  background: rgba(244, 63, 94, 0.1);
}

.modal-body {
  padding: 1.5rem;
  overflow-y: auto;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.modal-section-heading {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
}

.modal-formula-box {
  background: #04060a;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  color: var(--primary-color);
  font-size: 0.84rem;
  text-align: center;
}

.modal-steps-list {
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  background: var(--bg-card-subtle);
}