/* ================================================
     MAIN.CSS CONSOLIDADO Y OPTIMIZADO - VERSIÓN 3.0
     ================================================ */

  /* ================================================
     1. VARIABLES CSS GLOBALES
     ================================================ */
  :root {
    /* Colores principales */
    --primary-color: #0d6efd;
    --primary-gradient: linear-gradient(45deg, #007bff, #00c6ff);
    --success-color: #198754;
    --success-gradient: linear-gradient(45deg, #198754, #20c997);
    --warning-color: #ffc107;
    --warning-gradient: linear-gradient(45deg, #ffc107, #ffeb3b);
    --danger-color: #dc3545;
    --danger-gradient: linear-gradient(45deg, #dc3545, #f1556c);

    /* Fondos y bordes */
    --bg-light: #f8f9fa;
    --bg-gradient: linear-gradient(135deg, rgba(224, 247, 250, 0.3) 0%, rgba(8, 112, 33, 0.05) 50%, rgba(8, 112, 33, 0.2) 70%);
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 15px;

    /* Sombras */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 15px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 25px rgba(0, 0, 0, 0.15);

    /* Transiciones y dimensiones */
    --transition: all 0.3s ease;
    --header-height-desktop: 90px;
    --header-height-mobile: 140px;

    /* Navbar universal */
  --universal-navbar-height: 70px;
  --universal-navbar-height-mobile: 120px;
  --universal-navbar-bg: #ffffff;
  --universal-brand-color: #087021;
  --universal-brand-hover: #065d1a;

    /* Colores plata premium */
    --platinum-gradient: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 25%, #cbd5e1 50%, #94a3b8 75%, #64748b 100%);
    --platinum-gradient-hover: linear-gradient(135deg, #ffffff 0%, #f1f5f9 25%, #e2e8f0 50%, #cbd5e1 75%, #94a3b8 100%);
    --platinum-shimmer: linear-gradient(45deg, transparent 30%, rgba(255, 255, 255, 0.8) 50%, transparent 70%);
    --platinum-shadow: rgba(100, 116, 139, 0.2);
    --platinum-shadow-hover: rgba(100, 116, 139, 0.3);
    --platinum-glow: rgba(148, 163, 184, 0.4);
  }

  /* ================================================
     2. BASE RESET Y CONFIGURACIÓN GLOBAL
     ================================================ */
  html { scroll-behavior: smooth; }

  body {
    background: var(--bg-gradient);
    background-color: var(--bg-light);
    background-attachment: fixed;
    min-height: 100vh;
    margin: 0;
    position: relative;
  }

  /* Configuración por defecto del header */
  html { scroll-padding-top: var(--header-height-desktop); }
  body { padding-top: var(--header-height-desktop); }

  /* Zona de protección superior por defecto */
  body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height-desktop);
    background: linear-gradient(135deg, rgba(248, 249, 250, 0.95) 0%, rgba(224, 247, 250, 0.95) 100%);
    backdrop-filter: blur(8px);
    z-index: 1000;
    pointer-events: none;
  }

  /* ================================================
     3. LAYOUTS ESPECIALES
     ================================================ */

  /* Landing Page Reset */
  body.landing-page,
  body.register-page,
  body.esquema-landing-page {
    padding-top: 0 !important;
  }

  body.landing-page .top-right-buttons,
  body.landing-page::before,
  body.register-page .top-right-buttons,
  body.register-page::before,
  body.esquema-landing-page .top-right-buttons,
  body.esquema-landing-page::before {
    display: none !important;
  }

  /* Login Page Reset */
  body.bg-login {
    background-color: var(--bg-light);
    min-height: 100vh;
    padding-top: 0 !important;
    display: flex;
    justify-content: center;
    align-items: center;
  }

  /* Universal Navbar Pages */
  body.universal-navbar-page {
    padding-top: var(--universal-navbar-height) !important;
  }

  body.universal-navbar-page .top-right-buttons,
  body.universal-navbar-page::before {
    display: none !important;
  }

  body.universal-navbar-page > *:first-child:not(.universal-navbar) {
    margin-top: 0 !important;
  }

  /* Duplicates Page */
  .duplicates-page {
    background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%) !important;
    min-height: 100vh;
  }

  /* ================================================
     5. NAVBAR UNIVERSAL
     ================================================ */
  .universal-navbar {
    background: var(--universal-navbar-bg);
    padding: 0;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--universal-navbar-height);
    border-bottom: 1px solid rgba(8, 112, 33, 0.1);
    backdrop-filter: blur(8px);
    transition: var(--transition);
  }

  .universal-nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
  }

  .universal-nav-brand {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--universal-brand-color);
    font-weight: 800;
    font-size: 1.5rem;
    transition: var(--transition);
  }

  .universal-nav-brand:hover {
    color: var(--universal-brand-hover);
    text-decoration: none;
    transform: translateY(-1px);
  }

  .universal-nav-brand i { margin-right: 8px; font-size: 1.8rem; }

  .universal-nav-left {
    display: flex;
    align-items: center;
    gap: 30px;
  }

  .universal-nav-left a {
    text-decoration: none;
    color: #333;
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition);
    padding: 8px 0;
    position: relative;
  }

  .universal-nav-left a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--universal-brand-color);
    transition: width 0.3s ease;
  }

  .universal-nav-left a:hover {
    color: var(--universal-brand-color);
    text-decoration: none;
  }

  .universal-nav-left a:hover::after { width: 100%; }

  .universal-nav-right {
    display: flex;
    align-items: center;
    gap: 15px;
  }

  /* Botones del navbar universal */
  .universal-btn {
    padding: 8px 20px;
    border: none;
    border-radius: var(--border-radius-sm);
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    white-space: nowrap;
  }

  .universal-btn i { font-size: 1.1rem; }

  .universal-btn-outline {
    border: 2px solid var(--universal-brand-color);
    color: var(--universal-brand-color);
    background: transparent;
  }

  .universal-btn-outline:hover {
    background: var(--universal-brand-color);
    color: white;
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(8, 112, 33, 0.2);
  }

  .universal-btn-primary {
    background: var(--universal-brand-color);
    color: white;
    border: 2px solid var(--universal-brand-color);
  }

  .universal-btn-primary:hover {
    background: var(--universal-brand-hover);
    border-color: var(--universal-brand-hover);
    color: white;
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(8, 112, 33, 0.3);
  }

  .universal-btn-danger {
    background: var(--danger-color);
    color: white;
    border: 2px solid var(--danger-color);
  }

  .universal-btn-danger:hover {
    background: #c82333;
    border-color: #c82333;
    color: white;
    text-decoration: none;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(220, 53, 69, 0.3);
  }

  /* ================================================
     6. LANDING PAGE NAVBARS
     ================================================ */
  .landing-navbar {
    background: #fff;
    padding: 1rem 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
  }

  .landing-nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .landing-nav-left {
    display: flex;
    align-items: center;
  }

  .landing-nav-left a {
    text-decoration: none;
    color: #333;
    margin-right: 30px;
    font-weight: 600;
    font-size: 16px;
    transition: var(--transition);
  }

  .landing-nav-left a:hover { color: var(--universal-brand-color); }

  .landing-nav-right {
    display: flex;
    gap: 15px;
  }

  .landing-btn {
    padding: 8px 20px;
    border: none;
    border-radius: var(--border-radius-sm);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
  }

  .landing-btn-outline {
    border: 2px solid var(--universal-brand-color);
    color: var(--universal-brand-color);
    background: transparent;
  }

  .landing-btn-outline:hover {
    background: var(--universal-brand-color);
    color: white;
    text-decoration: none;
  }

  .landing-btn-primary {
    background: var(--universal-brand-color);
    color: white;
    border: 2px solid var(--universal-brand-color);
  }

  .landing-btn-primary:hover {
    background: var(--universal-brand-hover);
    border-color: var(--universal-brand-hover);
    color: white;
    text-decoration: none;
  }

  .landing-btn-white {
    background: white;
    color: var(--universal-brand-color);
    border: 2px solid white;
    font-weight: 700;
  }

  .landing-btn-white:hover {
    background: #f8f9fa;
    border-color: #f8f9fa;
    color: var(--universal-brand-hover);
    text-decoration: none;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  }

  .landing-btn-large {
    padding: 15px 40px;
    font-size: 1.1rem;
    border-radius: var(--border-radius-md);
  }

  /* ================================================
     7. LANDING PAGE SECCIONES
     ================================================ */
  .landing-hero {
    background: linear-gradient(60deg, rgba(224, 247, 250, 0.9) 0%, rgba(8, 112, 33, 0.9) 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
  }

  .landing-hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }

  .landing-hero h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    font-weight: 700;
  }

  .landing-hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
  }

  .landing-stats {
    display: inline-block;
    background: rgba(255,255,255,0.2);
    padding: 15px 30px;
    border-radius: 50px;
    margin: 20px 0;
    backdrop-filter: blur(5px);
  }

  .landing-features {
    padding: 80px 0;
    background: linear-gradient(180deg, #e0f7fa 0%, #f1f8e9 100%);
  }

  .landing-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }

  .landing-section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 50px;
    color: #333;
  }

  .landing-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
  }

  .landing-feature-card {
    background: white;
    padding: 30px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition);
  }

  .landing-feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
  }

  .landing-feature-card h3 {
    color: #333;
    margin-bottom: 15px;
    font-size: 1.5rem;
    font-weight: 700;
  }

  .landing-feature-card p {
    color: #666;
    line-height: 1.6;
  }

  .landing-cta {
    background: linear-gradient(135deg, var(--universal-brand-color) 0%, var(--universal-brand-hover) 100%);
    color: white;
    padding: 60px 0;
    text-align: center;
  }

  .landing-cta h2 {
    font-size: 2rem;
    margin-bottom: 20px;
  }

  .landing-cta p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    opacity: 0.9;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
  }

  .landing-footer {
    background: linear-gradient(135deg, var(--universal-brand-hover) 0%, #043d11 100%);
    color: white;
    padding: 40px 0;
    text-align: center;
  }

  /* ================================================
     8. COMPONENTES UI
     ================================================ */

  /* Títulos */
  .title-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
  }

  .page-title-label {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: block;
    text-align: center;
    margin-top: 0.5rem;
    margin-bottom: 3rem;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  }

  /* Cards */
  .card-custom,
  .card-login {
    border: none;
    box-shadow: var(--shadow-md);
    border-radius: var(--border-radius-md);
    transition: var(--transition);
  }

  .card-custom:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
  }

  .card-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
  }

  /* Botones */
  .btn-gradient-primary {
    background: var(--primary-gradient);
    border: none;
    color: white;
    transition: var(--transition);
  }

  .btn-gradient-primary:hover {
    background: linear-gradient(45deg, #0056b3, #008ecc);
    color: #e0e0e0;
    transform: translateY(-1px);
  }

  .btn-outline-secondary {
    transition: var(--transition);
  }

  .btn-outline-secondary:hover {
    background-color: #6c757d;
    color: white;
    transform: translateY(-1px);
  }

  /* Texto con gradiente */
  .text-gradient-primary {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  .text-gradient-success {
    background: var(--success-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  /* Alerts */
  .alert {
    font-size: 1rem;
    box-shadow: var(--shadow-sm);
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    border: none;
  }

  .alert-success {
    background: linear-gradient(135deg, rgba(25, 135, 84, 0.1), rgba(25, 135, 84, 0.05));
    border-left: 4px solid var(--success-color);
  }

  .alert-danger {
    background: linear-gradient(135deg, rgba(220, 53, 69, 0.1), rgba(220, 53, 69, 0.05));
    border-left: 4px solid var(--danger-color);
  }

  .alert-info {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(59, 130, 246, 0.05));
    border-left: 4px solid #3b82f6;
  }

  .alert-warning {
    background: linear-gradient(135deg, rgba(255, 193, 7, 0.1), rgba(255, 193, 7, 0.05));
    border-left: 4px solid var(--warning-color);
  }

  /* ================================================
     9. COMPONENTE QUIZ
     ================================================ */
  /* Contenedor principal de pregunta y respuestas con ancho fijo */
  .contenido-quiz {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    overflow: hidden;
  }

  /* Área de pregunta con altura flexible */
  .pregunta-contenedor {
    min-height: 120px;
    max-height: 300px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-bottom: 2px solid #dee2e6;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
  }

  .pregunta-area {
    height: 100%;
    width: 100%;
    overflow-y: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
  }

  .pregunta-texto {
    font-size: 1.1rem;
    line-height: 1.6;
    color: #2c3e50;
    font-weight: 500;
    word-wrap: break-word;
    hyphens: auto;
    max-width: 100%;
  }

  /* Área de respuestas con altura fija */
  .respuestas-contenedor {
    height: 250px;
    padding: 1.5rem;
    overflow-y: auto;
    background: white;
  }

  /* Contenedor con espacio reservado para el mensaje de feedback */
  .feedback-container {
    min-height: 70px;
    margin: 0 1rem 1rem 1rem;
    transition: var(--transition);
  }

  .feedback-container .alert {
    margin-bottom: 0;
  }

  .feedback-container:empty {
    min-height: 70px;
  }

  /* Estilos para respuesta correcta */
  .respuesta-correcta {
    font-weight: bold !important;
    color: var(--success-color) !important;
    background-color: rgba(40, 167, 69, 0.1) !important;
    border-left: 4px solid var(--success-color) !important;
    padding-left: 12px !important;
  }

  .respuesta-correcta strong {
    color: var(--success-color) !important;
    font-weight: bold !important;
  }

  .list-group-item strong {
    margin-right: 8px;
  }

  .list-group-item {
    border: 1px solid #dee2e6;
    margin-bottom: 2px;
    border-radius: 4px;
    word-wrap: break-word;
    transition: var(--transition);
  }

  .list-group-item:hover {
    background-color: #f8f9fa;
  }

  /* Scrollbar personalizado */
  .pregunta-area::-webkit-scrollbar,
  .respuestas-contenedor::-webkit-scrollbar {
    width: 8px;
  }

  .pregunta-area::-webkit-scrollbar-track,
  .respuestas-contenedor::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
  }

  .pregunta-area::-webkit-scrollbar-thumb,
  .respuestas-contenedor::-webkit-scrollbar-thumb {
    background: #cbd5e0;
    border-radius: 4px;
  }

  .pregunta-area::-webkit-scrollbar-thumb:hover,
  .respuestas-contenedor::-webkit-scrollbar-thumb:hover {
    background: #a0aec0;
  }

  /* Estilos para información adicional */
  .info-adicional {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-top: 1px solid #dee2e6;
    padding: 1.2rem;
    margin-top: 1rem;
    border-radius: 0.5rem;
  }

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

  .info-item {
    background: white;
    padding: 0.8rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  }

  .info-label {
    font-weight: 600;
    color: #495057;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.3rem;
    display: block;
  }

  .info-value {
    color: #212529;
    font-size: 0.9rem;
    line-height: 1.4;
    word-wrap: break-word;
  }

  .explicacion-item {
    grid-column: 1 / -1;
    border-left-color: var(--success-color);
  }

  .explicacion-texto {
    background-color: rgba(40, 167, 69, 0.05);
    padding: 0.8rem;
    border-radius: 6px;
    border: 1px solid rgba(40, 167, 69, 0.2);
    font-style: italic;
    margin-top: 0.5rem;
    word-wrap: break-word;
    hyphens: auto;
  }

  .temas-lista {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-top: 0.5rem;
  }

  .tema-badge {
    background: var(--primary-gradient);
    color: white;
    padding: 0.3rem 0.6rem;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 500;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
  }

  .ia-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
  }

  .ia-badge.creada-ia {
    background: linear-gradient(45deg, #17a2b8, #138496);
    color: white;
  }

  .ia-badge.no-ia {
    background: linear-gradient(45deg, #6c757d, #545b62);
    color: white;
  }

  .revision-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
  }

  .revision-badge.revisada {
    background: var(--success-gradient);
    color: white;
  }

  .revision-badge.no-revisada {
    background: var(--warning-gradient);
    color: #212529;
  }

  .probabilidad-item {
    border-left-color: var(--warning-color);
  }

  .probabilidad-valor {
    font-size: 1.1rem;
    font-weight: bold;
    color: #e0a800;
  }

  .probabilidad-texto {
    background-color: rgba(255, 193, 7, 0.1);
    padding: 0.6rem;
    border-radius: 6px;
    border: 1px solid rgba(255, 193, 7, 0.3);
    margin-top: 0.5rem;
    font-size: 0.85rem;
    word-wrap: break-word;
  }

  .fechas-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem;
  }

  .fecha-item {
    background: rgba(108, 117, 125, 0.05);
    padding: 0.6rem;
    border-radius: 6px;
    border: 1px solid rgba(108, 117, 125, 0.2);
  }

  .fecha-label {
    font-size: 0.75rem;
    color: #6c757d;
    text-transform: uppercase;
    font-weight: 600;
    margin-bottom: 0.2rem;
  }

  .fecha-valor {
    font-size: 0.85rem;
    color: #495057;
    font-weight: 500;
  }

  .text-blue {
    color: var(--primary-color) !important;
  }

  .text-blue .bi {
    margin-right: 4px;
  }

  /* Contenedor de mensajes del sistema */
  .messages-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    max-width: 400px;
  }

  .alert-dismissible .btn-close {
    padding: 0.75rem 0.75rem;
  }

  /* ================================================
     10. HERRAMIENTAS CARD PLATINUM
     ================================================ */
  .card-herramientas {
    background: var(--platinum-gradient);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
    box-shadow: 0 8px 25px var(--platinum-shadow),
                inset 0 1px 0 rgba(255, 255, 255, 0.6),
                inset 0 -1px 0 rgba(100, 116, 139, 0.15);
  }

  /* Borde y efectos animados */
  .card-herramientas::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg,
      #f8fafc, #e2e8f0, #cbd5e1, #94a3b8,
      #64748b, #94a3b8, #cbd5e1, #e2e8f0, #f8fafc);
    background-size: 300% 300%;
    border-radius: inherit;
    z-index: -1;
    animation: platinum-border-flow 3s ease-in-out infinite;
    opacity: 0.7;
  }

  .card-herramientas::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--platinum-shimmer);
    z-index: 1;
    transition: left 0.6s ease;
    pointer-events: none;
  }

  .card-herramientas:hover {
    transform: translateY(-5px) rotateX(3deg);
    box-shadow: 0 12px 35px var(--platinum-shadow-hover),
                inset 0 2px 0 rgba(255, 255, 255, 0.8),
                inset 0 -2px 0 rgba(100, 116, 139, 0.25);
    background: var(--platinum-gradient-hover);
  }

  .card-herramientas:hover::before {
    opacity: 1;
    animation-duration: 2s;
  }

  .card-herramientas:hover::after {
    left: 100%;
  }

  /* Elementos platinum */
  .card-herramientas .icon-herramientas {
    font-size: 3.5rem !important;
    background: linear-gradient(145deg, #374151, #4b5563, #6b7280, #9ca3af);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 3px 6px rgba(31, 41, 55, 0.3));
    animation: platinum-pulse 2.5s ease-in-out infinite;
    position: relative;
    z-index: 2;
  }

  .card-herramientas .title-herramientas {
    background: linear-gradient(145deg, #1f2937, #374151, #4b5563, #64748b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700 !important;
    position: relative;
    z-index: 2;
    letter-spacing: 0.3px;
  }

  .card-herramientas .btn-herramientas {
    background: linear-gradient(145deg, #f8fafc, #e2e8f0, #cbd5e1) !important;
    border: 2px solid rgba(148, 163, 184, 0.3) !important;
    color: #1f2937 !important;
    font-weight: 700 !important;
    text-transform: uppercase !important;
    letter-spacing: 0.8px !important;
    padding: 0.75rem 1.5rem !important;
    border-radius: 8px !important;
    position: relative !important;
    overflow: hidden !important;
    z-index: 2 !important;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) !important;
    box-shadow: 0 6px 20px var(--platinum-shadow),
                inset 0 1px 0 rgba(255, 255, 255, 0.7),
                inset 0 -1px 0 rgba(100, 116, 139, 0.15) !important;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.6) !important;
  }

  .card-herramientas .btn-herramientas::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
      transparent,
      rgba(255, 255, 255, 0.3),
      rgba(255, 255, 255, 0.6),
      rgba(255, 255, 255, 0.3),
      transparent);
    transition: left 0.5s ease;
    z-index: -1;
  }

  .card-herramientas .btn-herramientas:hover {
    background: linear-gradient(145deg, #ffffff, #f1f5f9, #e2e8f0) !important;
    transform: translateY(-2px) scale(1.02) !important;
    box-shadow: 0 8px 25px var(--platinum-shadow-hover),
                inset 0 2px 0 rgba(255, 255, 255, 0.9),
                inset 0 -2px 0 rgba(100, 116, 139, 0.2),
                0 0 15px var(--platinum-glow) !important;
    border-color: rgba(148, 163, 184, 0.5) !important;
    color: #111827 !important;
  }

  .card-herramientas .btn-herramientas:hover::before {
    left: 100%;
  }

  .card-herramientas .text-muted {
    color: #374151 !important;
    font-weight: 500;
    position: relative;
    z-index: 2;
  }

  .card-herramientas .text-muted.fw-medium {
    color: #1f2937 !important;
    font-weight: 600 !important;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.4);
  }

  /* Animaciones platinum */
  @keyframes platinum-border-flow {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
  }

  @keyframes platinum-pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.95; transform: scale(1.02); }
  }

  /* ================================================
     11. FORMULARIOS
     ================================================ */
  .form-login {
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
  }

  .cambiar-contraseña-form {
    max-width: 480px;
    margin: 0 auto;
    padding: 2.5rem 2rem;
    background-color: #fff;
    border-radius: var(--border-radius-md);
    box-shadow: 0 8px 20px rgba(0, 123, 255, 0.1), 0 4px 10px rgba(0, 198, 255, 0.15);
    transition: var(--transition);
  }

  .cambiar-contraseña-form:hover {
    box-shadow: 0 12px 30px rgba(0, 123, 255, 0.15), 0 6px 15px rgba(0, 198, 255, 0.2);
  }

  .cambiar-contraseña-form h2 {
    margin-bottom: 20px;
  }

  .cambiar-contraseña-form input.form-control {
    border: 2px solid #00bfff;
    border-radius: var(--border-radius-sm);
    padding: 0.5rem 1rem;
    transition: var(--transition);
  }

  .cambiar-contraseña-form input.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 8px rgba(0, 123, 255, 0.5);
    outline: none;
  }

  /* ================================================
     12. PÁGINAS ESPECÍFICAS
     ================================================ */

  /* Página de registro */
  .register-container {
    width: 100% !important;
    max-width: 900px !important;
    padding: 2rem !important;
    margin: 30px auto 0 auto !important;
  }

  .register-container .page-title-label {
    background: var(--success-gradient) !important;
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    background-clip: text !important;
    font-size: 3rem !important;
    margin-bottom: 2rem !important;
  }

  .register-container .card-login {
    box-shadow: 0 8px 25px rgba(25, 135, 84, 0.15) !important;
    border-radius: var(--border-radius-lg) !important;
    max-height: none !important;
    overflow-y: visible !important;
  }

  .register-container .card-login .card-header {
    background: var(--success-gradient) !important;
  }

  .register-container .step-item {
    display: flex !important;
    align-items: flex-start !important;
    padding: 1.2rem !important;
    border-radius: var(--border-radius-md) !important;
    background: linear-gradient(135deg, var(--bg-light), #e9ecef) !important;
    border-left: 4px solid var(--success-color) !important;
    margin-bottom: 1rem !important;
    transition: var(--transition) !important;
    box-shadow: var(--shadow-sm) !important;
  }

  .register-container .step-item:hover {
    transform: translateX(5px) !important;
    box-shadow: 0 4px 15px rgba(25, 135, 84, 0.1) !important;
  }

  .register-container .step-number {
    background: var(--success-gradient) !important;
    color: white !important;
    width: 35px !important;
    height: 35px !important;
    border-radius: 50% !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    font-weight: bold !important;
    margin-right: 1rem !important;
    flex-shrink: 0 !important;
    box-shadow: 0 2px 8px rgba(25, 135, 84, 0.3) !important;
  }

  .register-container .btn-success {
    background: var(--success-gradient) !important;
    border: none !important;
    padding: 0.8rem 1.5rem !important;
    font-weight: 600 !important;
    border-radius: 10px !important;
    transition: var(--transition) !important;
    box-shadow: 0 4px 15px rgba(25, 135, 84, 0.3) !important;
  }

  .register-container .btn-success:hover {
    background: linear-gradient(45deg, #157347, #1aa179) !important;
    transform: translateY(-2px) !important;
    box-shadow: 0 6px 20px rgba(25, 135, 84, 0.4) !important;
  }

  /* Página de estadísticas */
  .bg-gradient-success {
    background: var(--success-gradient) !important;
  }

  .table-striped > tbody > tr:nth-of-type(odd) {
    background-color: #e3f2fd;
  }

  .table-primary {
    background-color: var(--primary-color) !important;
  }

  .table-success {
    background-color: var(--success-color) !important;
  }

  .table-info {
    background-color: #0dcaf0 !important;
  }

  .progress {
    background-color: #d1e7dd;
  }

  /* Carga de preguntas */
  .upload-page {
    padding-top: 20px !important;
  }

  .upload-zone {
    border: 3px dashed var(--primary-color);
    border-radius: var(--border-radius-md);
    padding: 3rem;
    text-align: center;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    transition: var(--transition);
    cursor: pointer;
  }

  .upload-zone:hover {
    border-color: #0056b3;
    background: linear-gradient(135deg, #e9ecef, #dee2e6);
  }

  .upload-zone.dragover {
    border-color: var(--success-color);
    background: linear-gradient(135deg, #d1e7dd, #f8f9fa);
  }

  .info-card {
    border-left: 4px solid var(--primary-color);
  }

  .warning-card {
    border-left: 4px solid var(--warning-color);
  }

  .success-card {
    border-left: 4px solid var(--success-color);
  }

  .estructura-json {
    max-height: 300px;
    overflow-y: auto;
    border-radius: var(--border-radius-sm);
  }

  .estructura-json pre {
    margin: 0;
    font-size: 0.85rem;
    line-height: 1.4;
  }

  .pregunta-card {
    border-left: 4px solid var(--primary-color);
    transition: var(--transition);
  }

  .pregunta-card.error {
    border-left-color: var(--danger-color);
  }

  .pregunta-card.warning {
    border-left-color: var(--warning-color);
  }

  .pregunta-card.success {
    border-left-color: var(--success-color);
  }

  .respuesta-item {
    background-color: #f8f9fa;
    border-radius: var(--border-radius-sm);
    padding: 0.5rem 0.75rem;
    margin-bottom: 0.25rem;
    transition: var(--transition);
  }

  .respuesta-item:hover {
    background-color: #e9ecef;
  }

  .estadisticas {
    position: sticky;
    top: 110px;
  }

  .badge-custom {
    font-size: 0.8rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--border-radius-sm);
  }

  .resultado-card {
    border: none;
    box-shadow: var(--shadow-lg);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
  }

  .stats-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    font-weight: bold;
    color: white;
    margin: 0 auto 1rem;
    box-shadow: var(--shadow-md);
  }

  .success-circle {
    background: var(--success-gradient);
  }

  .error-circle {
    background: var(--danger-gradient);
  }

  .info-circle {
    background: linear-gradient(45deg, #0dcaf0, #6edff6);
  }

  /* Animaciones */
  .animation-success {
    animation: bounceIn 1s ease-out;
  }

  @keyframes bounceIn {
    0% {
      transform: scale(0.3);
      opacity: 0;
    }
    50% {
      transform: scale(1.05);
    }
    70% {
      transform: scale(0.9);
    }
    100% {
      transform: scale(1);
      opacity: 1;
    }
  }

  /* Esquemas */
  .esquema-landing-page .hero-section {
    background: var(--primary-gradient);
    color: white;
    position: relative;
    overflow: hidden;
  }

  .esquema-landing-page .hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 20%, rgba(255,255,255,0.1), transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(255,255,255,0.1), transparent 50%);
    opacity: 0.6;
  }

  .esquema-landing-page .min-vh-75 {
    min-height: 75vh;
  }

  .esquema-landing-page .hero-content {
    position: relative;
    z-index: 2;
  }

  .esquema-landing-page .hero-icon {
    font-size: 8rem;
    color: rgba(255,255,255,0.2);
    margin-bottom: 2rem;
    animation: esquema-float 3s ease-in-out infinite;
  }

  .esquema-landing-page .hero-buttons .btn {
    box-shadow: var(--shadow-md);
    transition: var(--transition);
  }

  .esquema-landing-page .hero-buttons .btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
  }

  .esquema-landing-page .generator-section {
    background: linear-gradient(135deg, var(--bg-light) 0%, rgba(224, 247, 250, 0.3) 100%);
  }

  .esquema-landing-page .card {
    border: none;
    box-shadow: var(--shadow-md);
    border-radius: var(--border-radius-md);
    transition: var(--transition);
    overflow: hidden;
  }

  .esquema-landing-page .card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
  }

  .esquema-landing-page .card-header.bg-info {
    background: linear-gradient(135deg, #17a2b8, #20c997) !important;
  }

  .esquema-landing-page .card-header.bg-warning {
    background: var(--warning-gradient) !important;
  }

  .esquema-landing-page .card-header.bg-success {
    background: var(--success-gradient) !important;
  }

  .esquema-landing-page .form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
  }

  .esquema-landing-page .form-control-lg {
    border-radius: var(--border-radius-sm);
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  }

  .esquema-landing-page .example-text {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.85rem;
    line-height: 1.4;
    border-radius: var(--border-radius-sm);
  }

  .esquema-landing-page .btn-warning {
    background: var(--warning-gradient);
    border: none;
    font-weight: 600;
    transition: var(--transition);
  }

  .esquema-landing-page .btn-warning:hover {
    background: linear-gradient(45deg, #e0a800, #f39c12);
    transform: translateY(-1px);
  }

  .esquema-landing-page .btn-success {
    background: var(--success-gradient);
    border: none;
  }

  .esquema-landing-page .btn-success:hover {
    background: linear-gradient(45deg, #157347, var(--success-color));
  }

  .esquema-landing-page .btn-outline-success:hover {
    background: var(--success-color);
    border-color: var(--success-color);
  }

  .esquema-landing-page .btn-outline-info:hover {
    background: #17a2b8;
    border-color: #17a2b8;
  }

  .esquema-landing-page #charCount {
    font-weight: bold;
  }

  .esquema-landing-page .text-warning {
    color: var(--warning-color) !important;
  }

  .esquema-landing-page .results-section {
    background: linear-gradient(135deg, rgba(25, 135, 84, 0.05) 0%, rgba(25, 135, 84, 0.1) 100%);
  }

  .esquema-landing-page .result-image-container {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius-sm);
  }

  .esquema-landing-page .result-image {
    max-height: 600px;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
  }

  .esquema-landing-page .result-image:hover {
    transform: scale(1.02);
  }

  .esquema-landing-page .modal-content {
    border: none;
    border-radius: var(--border-radius-md);
  }

  .esquema-landing-page .modal-fullscreen .modal-body {
    background: linear-gradient(135deg, #000, #1a1a1a);
  }

  .esquema-landing-page #modalImage {
    border-radius: var(--border-radius-sm);
    box-shadow: 0 4px 20px rgba(255,255,255,0.1);
  }

  .esquema-landing-page .btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
  }

  .esquema-landing-page .spinner-border {
    width: 1rem;
    height: 1rem;
  }

  @keyframes esquema-float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
  }

  .esquema-landing-page .result-card {
    animation: esquema-slideInUp 0.6s ease-out;
  }

  @keyframes esquema-slideInUp {
    from {
      opacity: 0;
      transform: translateY(30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* Duplicadas */
  .duplicates-page .container {
    --green-primary: #10b981;
    --green-dark: #047857;
    --green-light: #d1fae5;
    --red-primary: #ef4444;
    --red-light: #fef2f2;
  }

  .duplicates-page .page-header {
    background: linear-gradient(135deg, rgba(255,255,255,0.95), rgba(255,255,255,0.9));
    backdrop-filter: blur(10px);
    border: 1px solid rgba(16, 185, 129, 0.1);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  }

  .duplicates-page .page-title {
    background: linear-gradient(135deg, var(--green-primary), var(--green-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
  }

  .duplicates-page .page-title i {
    color: var(--red-primary) !important;
    -webkit-text-fill-color: var(--red-primary) !important;
  }

  .duplicates-page .oposicion-card {
    border: 1px solid rgba(16, 185, 129, 0.1);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .duplicates-page .oposicion-card:hover {
    border-color: rgba(16, 185, 129, 0.3);
    box-shadow: 0 20px 25px -5px rgba(16, 185, 129, 0.1);
  }

  .duplicates-page .oposicion-icon {
    background: linear-gradient(135deg, var(--green-primary), var(--green-dark));
  }

  .duplicates-page .toggle-btn {
    background: rgba(16, 185, 129, 0.1);
    color: var(--green-primary);
    border: 1px solid rgba(16, 185, 129, 0.2);
  }

  .duplicates-page .toggle-btn:hover {
    background: rgba(16, 185, 129, 0.2);
  }

  .duplicates-page .temas-container {
    background: linear-gradient(135deg, #f8fdf9, #f0fdf4);
    border-top: 1px solid rgba(16, 185, 129, 0.1);
  }

  .duplicates-page .btn-primary {
    background: linear-gradient(135deg, var(--green-primary), var(--green-dark));
    border: none;
    box-shadow: 0 4px 6px -1px rgba(16, 185, 129, 0.2);
  }

  .duplicates-page .btn-primary:hover {
    background: var(--green-dark);
    box-shadow: 0 10px 15px -3px rgba(16, 185, 129, 0.3);
  }

  .duplicates-page .tema-card {
    transition: all 0.2s ease;
    border: 1px solid #e5e7eb;
  }

  .duplicates-page .tema-card:hover {
    background: rgba(16, 185, 129, 0.05);
    border-color: var(--green-primary);
    transform: translateY(-1px);
  }

  .duplicates-page .tema-card.selected {
    background: rgba(16, 185, 129, 0.1);
    border-color: var(--green-primary);
    border-width: 2px;
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
  }

  .duplicates-page .tema-numero {
    background: linear-gradient(135deg, var(--green-primary), var(--green-dark));
  }

  .duplicates-page .btn-analyze {
    background: linear-gradient(135deg, var(--green-primary), var(--green-dark));
    box-shadow: 0 10px 15px -3px rgba(16, 185, 129, 0.2);
  }

  .duplicates-page .btn-analyze:hover {
    background: var(--green-dark);
    box-shadow: 0 20px 25px -5px rgba(16, 185, 129, 0.3);
  }

  .duplicates-page .btn-delete {
    background: var(--danger-gradient);
    box-shadow: 0 10px 15px -3px rgba(239, 68, 68, 0.2);
  }

  .duplicates-page .btn-delete:hover {
    background: linear-gradient(135deg, #dc2626, #b91c1c);
    box-shadow: 0 20px 25px -5px rgba(239, 68, 68, 0.3);
  }

  .duplicates-page .duplicate-card {
    background: linear-gradient(135deg, var(--red-light), rgba(239, 68, 68, 0.05));
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-left: 4px solid var(--red-primary);
  }

  .duplicates-page .duplicate-themes {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(245, 158, 11, 0.05));
    border: 1px solid rgba(245, 158, 11, 0.2);
  }

  .duplicates-page .selection-counter {
    background: linear-gradient(135deg, var(--green-primary), var(--green-dark));
    box-shadow: 0 20px 25px -5px rgba(16, 185, 129, 0.2), 0 10px 10px -5px rgba(16, 185, 129, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
  }

  .duplicates-page .selection-counter:hover {
    transform: translateY(-2px);
    box-shadow: 0 25px 35px -5px rgba(16, 185, 129, 0.3);
  }

  .duplicates-page .loading-overlay {
    backdrop-filter: blur(8px);
  }

  .duplicates-page .loading-content {
    background: linear-gradient(135deg, rgba(255,255,255,0.95), rgba(255,255,255,0.9));
    backdrop-filter: blur(10px);
    border: 1px solid rgba(16, 185, 129, 0.1);
  }

  .duplicates-page .spinner {
    border-top-color: var(--green-primary);
  }

  .duplicates-page .btn-action {
    position: relative;
    overflow: hidden;
  }

  .duplicates-page .btn-action::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
  }

  .duplicates-page .btn-action:hover::before {
    left: 100%;
  }

  @keyframes duplicatesFadeIn {
    from {
      opacity: 0;
      transform: translateY(20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .duplicates-page .oposicion-card {
    animation: duplicatesFadeIn 0.5s ease-out;
  }

  .duplicates-page .oposicion-card:nth-child(2) { animation-delay: 0.1s; }
  .duplicates-page .oposicion-card:nth-child(3) { animation-delay: 0.2s; }
  .duplicates-page .oposicion-card:nth-child(4) { animation-delay: 0.3s; }

  /* ================================================
     13. PROTECCIONES Y RESETS
     ================================================ */

  /* Protección platinum - resetear en páginas específicas */
  .upload-page .card-herramientas,
  .register-page .card-herramientas,
  .quiz-page .card-herramientas,
  .exam-page .card-herramientas,
  body.bg-login .card-herramientas {
    background: linear-gradient(135deg, #f8fafc, #f1f5f9) !important;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1) !important;
    border: 1px solid #e2e8f0 !important;
  }

  .upload-page .card-herramientas::before,
  .upload-page .card-herramientas::after,
  .register-page .card-herramientas::before,
  .register-page .card-herramientas::after,
  .quiz-page .card-herramientas::before,
  .quiz-page .card-herramientas::after,
  .exam-page .card-herramientas::before,
  .exam-page .card-herramientas::after,
  body.bg-login .card-herramientas::before,
  body.bg-login .card-herramientas::after {
    display: none !important;
  }

  .upload-page .card-herramientas .icon-herramientas,
  .register-page .card-herramientas .icon-herramientas,
  .quiz-page .card-herramientas .icon-herramientas,
  .exam-page .card-herramientas .icon-herramientas,
  body.bg-login .card-herramientas .icon-herramientas,
  .upload-page .card-herramientas .title-herramientas,
  .register-page .card-herramientas .title-herramientas,
  .quiz-page .card-herramientas .title-herramientas,
  .exam-page .card-herramientas .title-herramientas,
  body.bg-login .card-herramientas .title-herramientas {
    background: linear-gradient(145deg, var(--primary-color), #0ea5e9) !important;
    -webkit-background-clip: text !important;
    -webkit-text-fill-color: transparent !important;
    animation: none !important;
    filter: none !important;
  }

  .upload-page .card-herramientas .btn-herramientas,
  .register-page .card-herramientas .btn-herramientas,
  .quiz-page .card-herramientas .btn-herramientas,
  .exam-page .card-herramientas .btn-herramientas,
  body.bg-login .card-herramientas .btn-herramientas {
    background: var(--primary-color) !important;
    color: white !important;
    animation: none !important;
    border: 1px solid var(--primary-color) !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1) !important;
    text-shadow: none !important;
    text-transform: none !important;
    letter-spacing: normal !important;
    font-weight: 500 !important;
  }

  .upload-page .card-herramientas .btn-herramientas:hover,
  .register-page .card-herramientas .btn-herramientas:hover,
  .quiz-page .card-herramientas .btn-herramientas:hover,
  .exam-page .card-herramientas .btn-herramientas:hover,
  body.bg-login .card-herramientas .btn-herramientas:hover {
    background: #0056b3 !important;
    transform: translateY(-1px) !important;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15) !important;
  }

  .upload-page .card-herramientas .btn-herramientas::before,
  .register-page .card-herramientas .btn-herramientas::before,
  .quiz-page .card-herramientas .btn-herramientas::before,
  .exam-page .card-herramientas .btn-herramientas::before,
  body.bg-login .card-herramientas .btn-herramientas::before {
    display: none !important;
  }

  /* Resetear estilos específicos de página en otras páginas */
  body:not(.duplicates-page) .duplicates-container,
  body:not(.duplicates-page) .page-header,
  body:not(.duplicates-page) .temas-container,
  body:not(.duplicates-page) .selection-counter {
    background: inherit !important;
    border: inherit !important;
    box-shadow: inherit !important;
  }

  .content-wrapper {
    min-height: calc(100vh - var(--header-height-desktop));
    padding-top: 0;
  }

  .universal-content {
    padding-top: 20px;
    min-height: calc(100vh - var(--universal-navbar-height));
  }

  .universal-container {
    width: 100%;
    max-width: 1200px;
    padding: 2rem;
    margin: 0 auto;
  }

  /* ================================================
     14. UTILIDADES GENERALES
     ================================================ */
  .bi {
    vertical-align: -.125em;
  }

  .quiz-page,
  .exam-page,
  .home-page {
    padding-top: 20px !important;
  }

  .actualizar-fijo {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1040;
  }

  .modal-aviso .modal-header {
    background-color: var(--warning-color);
    color: #212529;
  }

  .modal-aviso .modal-body {
    font-size: 1.25rem;
  }

  .logout-btn,
  .logout-btn2 {
    position: static;
    margin: 0;
    padding: 0;
  }

  .logout-btn form {
    margin: 0;
  }

  /* Ejemplo section para esquemas */
  .example-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
  }

  .example-image-container {
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  }

  .example-image {
    transition: transform 0.3s ease;
  }

  .example-image:hover {
    transform: scale(1.02);
  }

  .rate-limit-warning {
    border-left: 4px solid var(--warning-color);
    background-color: #fff3cd;
    color: #856404;
  }

  .rate-limit-error {
    border-left: 4px solid var(--danger-color);
    background-color: #f8d7da;
    color: #721c24;
  }

  #loadingSpinner {
    animation: spin 1s linear infinite;
  }

  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }

  /* ================================================
     15. RESPONSIVE DESIGN
     ================================================ */

  /* Mobile (768px y menos) */
  @media (max-width: 768px) {
    :root {
      --header-height-desktop: var(--header-height-mobile);
      --universal-navbar-height: 60px;
    }

    html { scroll-padding-top: var(--header-height-mobile); }
    body { padding-top: var(--header-height-mobile); }
    body::before { height: var(--header-height-mobile); }

    body > *:first-child:not(.top-right-buttons) {
      margin-top: var(--header-height-mobile);
    }

    .content-wrapper {
      min-height: calc(100vh - var(--header-height-mobile));
    }

    .top-right-buttons {
      right: 10px;
      left: 10px;
      top: 10px;
      justify-content: center;
      padding: 10px;
    }

    .top-right-buttons a.btn,
    .top-right-buttons button {
      min-width: 90px;
      font-size: 0.7rem;
      padding: 0.4rem 0.6rem;
      height: 34px;
    }

    .page-title-label {
      font-size: 2.5rem;
    }

    .pregunta-contenedor {
      min-height: 100px;
      max-height: 250px;
      padding: 1rem;
    }

    .pregunta-texto {
      font-size: 1rem;
    }

    .respuestas-contenedor {
      height: 250px;
      padding: 1rem;
    }

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

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

    .upload-zone {
      padding: 2rem 1rem;
    }

    .estadisticas {
      position: static;
      margin-bottom: 2rem;
    }

    .stats-circle {
      width: 100px;
      height: 100px;
      font-size: 2rem;
    }

    .estructura-json {
      max-height: 200px;
    }

    .card-herramientas .icon-herramientas {
      font-size: 3rem !important;
    }

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

    .card-herramientas:hover {
      transform: translateY(-3px) rotateX(1deg);
    }

    .card-herramientas .btn-herramientas {
      padding: 0.7rem 1.3rem !important;
      font-size: 0.9rem !important;
    }

    .universal-nav-container {
      padding: 0 15px;
    }

    .universal-nav-left {
      gap: 15px;
    }

    .universal-nav-left a {
      font-size: 14px;
    }

    .universal-nav-brand {
      font-size: 1.3rem;
    }

    .universal-nav-brand i {
      font-size: 1.6rem;
    }

    .universal-btn {
      padding: 6px 16px;
      font-size: 13px;
    }

    .universal-container {
      padding: 1.5rem;
    }

    .landing-nav-container {
      flex-direction: column;
      gap: 20px;
    }

    .landing-nav-left {
      flex-direction: column;
      gap: 15px;
      text-align: center;
    }

    .landing-nav-left a {
      margin-right: 0;
    }

    .landing-hero h1 {
      font-size: 2rem;
    }

    .landing-hero p {
      font-size: 1.1rem;
    }

    .landing-features-grid {
      grid-template-columns: 1fr;
    }

    .landing-stats {
      padding: 12px 25px;
      font-size: 0.95rem;
    }

    .landing-btn-large {
      padding: 12px 30px;
      font-size: 1rem;
    }

    .landing-section-title {
      font-size: 1.75rem;
    }

    .landing-cta h2 {
      font-size: 1.75rem;
    }

    .landing-cta p {
      font-size: 1rem;
    }

    .register-container {
      padding: 1.5rem !important;
      max-width: 95% !important;
      margin-top: 20px !important;
    }

    .register-container .page-title-label {
      font-size: 2.5rem !important;
    }

    .esquema-landing-page .hero-icon {
      font-size: 4rem;
    }

    .esquema-landing-page .display-4 {
      font-size: 2rem;
    }

    .esquema-landing-page .result-image {
      max-height: 400px;
    }

    .esquema-landing-page .result-image-container {
      min-height: 250px;
    }

    .esquema-landing-page .hero-buttons {
      text-align: center;
    }

    .esquema-landing-page .hero-buttons .btn {
      width: 100%;
      max-width: 280px;
      margin-bottom: 10px;
    }

    .duplicates-page .page-title {
      font-size: 2rem;
    }

    .duplicates-page .page-title i {
      font-size: 2.5rem;
    }

    .duplicates-page .btn-action {
      width: 100%;
      max-width: 280px;
      justify-content: center;
    }
  }

  /* Pequeño Mobile (480px y menos) */
  @media (max-width: 480px) {
    .top-right-buttons {
      flex-direction: column;
      align-items: stretch;
      gap: 6px;
      padding: 12px;
    }

    .top-right-buttons a.btn,
    .top-right-buttons button {
      min-width: 100%;
      height: 36px;
    }

    .page-title-label {
      font-size: 2rem;
    }

    .upload-zone {
      padding: 1.5rem 1rem;
    }

    .upload-zone i {
      font-size: 2rem !important;
    }

    .upload-zone h4 {
      font-size: 1.25rem;
    }

    .stats-circle {
      width: 80px;
      height: 80px;
      font-size: 1.5rem;
    }

    .card-herramientas .icon-herramientas {
      font-size: 2.5rem !important;
    }

    .card-herramientas .btn-herramientas {
      font-size: 0.85rem !important;
      padding: 0.65rem 1.1rem !important;
      letter-spacing: 0.5px !important;
    }

    .card-herramientas:hover {
      transform: translateY(-2px);
    }

    .universal-nav-container {
      flex-direction: column;
      height: auto;
      padding: 10px 15px;
    }

    .universal-navbar {
      height: auto;
      min-height: var(--universal-navbar-height);
    }

    body.universal-navbar-page {
      padding-top: calc(var(--universal-navbar-height) + 20px);
    }

    .universal-nav-left {
      order: 2;
      margin-top: 10px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .universal-nav-right {
      order: 1;
      margin-top: 8px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .universal-btn {
      margin: 2px;
      flex: 1;
      min-width: 120px;
      justify-content: center;
    }

    .universal-container {
      padding: 1rem;
    }

    .landing-hero {
      padding: 60px 0;
    }

    .landing-hero h1 {
      font-size: 1.75rem;
    }

    .landing-features {
      padding: 60px 0;
    }

    .landing-feature-card {
      padding: 25px;
    }

    .landing-cta {
      padding: 50px 0;
    }

    .landing-btn {
      padding: 10px 15px;
      font-size: 0.9rem;
    }

    .landing-btn-large {
      padding: 12px 25px;
      font-size: 0.95rem;
    }

    .landing-nav-right {
      flex-direction: column;
      width: 100%;
      gap: 10px;
    }

    .landing-nav-right .landing-btn {
      text-align: center;
      width: 100%;
    }

    .register-container {
      padding: 1rem !important;
      margin-top: 15px !important;
    }

    .register-container .page-title-label {
      font-size: 2rem !important;
    }

    .register-container .step-item {
      flex-direction: column !important;
      text-align: center !important;
    }

    .register-container .step-number {
      margin-right: 0 !important;
      margin-bottom: 0.5rem !important;
    }

    .esquema-landing-page .hero-icon {
      font-size: 3rem;
    }

    .esquema-landing-page .card-body {
      padding: 1rem;
    }

    .esquema-landing-page .example-text {
      font-size: 0.8rem;
    }
  }

  /* Large Mobile (992px y menos) */
  @media (max-width: 992px) {
    .universal-nav-left {
      gap: 20px;
    }

    .universal-nav-left a {
      font-size: 15px;
    }

    .universal-nav-brand {
      font-size: 1.4rem;
    }
  }

  /* Tablet (576px y menos) */
  @media (max-width: 576px) {
    .example-image-container {
      margin-bottom: 1rem;
    }

    .results-section {
      scroll-margin-top: 10px;
    }
  }

  /* ================================================
     FIN DEL CSS CONSOLIDADO
     ================================================ */
  /* ================================================
     FIX NAVBAR UNIVERSAL EN MÓVILES
     ================================================ */

  /* Actualizar variables base del navbar */
  :root {
    /* Navbar universal - alturas actualizadas */
    --universal-navbar-height: 70px;
    --universal-navbar-height-mobile: 70px; /* Nueva variable para móviles */
    --universal-navbar-bg: #ffffff;
    --universal-brand-color: #087021;
    --universal-brand-hover: #065d1a;
  }

  /* ================================================
     NAVBAR UNIVERSAL BASE (Desktop)
     ================================================ */
  .universal-navbar {
    background: var(--universal-navbar-bg);
    padding: 0;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--universal-navbar-height);
    border-bottom: 1px solid rgba(8, 112, 33, 0.1);
    backdrop-filter: blur(8px);
    transition: var(--transition);
  }

  /* Páginas con navbar universal - padding base */
  body.universal-navbar-page {
    padding-top: var(--universal-navbar-height) !important;
  }

  /* Contenido universal con margen adicional */
  .universal-content {
    padding-top: 0px;
    min-height: calc(100vh - var(--universal-navbar-height));
  }

  .modern-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;  /* Reducido el padding vertical */
    min-height: calc(100vh - var(--universal-navbar-height) - 40px);
  }

  /* ================================================
     RESPONSIVE MÓVILES - NAVBAR FIXES
     ================================================ */

  /* Tablets y móviles grandes (768px y menos) */
  @media (max-width: 768px) {
    :root {
      --universal-navbar-height: var(--universal-navbar-height-mobile);
    }

    /* Navbar más alto en móviles */
    .universal-navbar {
      height: var(--universal-navbar-height-mobile);
      min-height: var(--universal-navbar-height-mobile);
    }

    /* Contenedor del navbar - layout vertical */
    .universal-nav-container {
      flex-direction: column;
      height: 100%;
      padding: 10px 15px;
      justify-content: center;
      gap: 8px;
    }

    /* Marca del navbar */
    .universal-nav-brand {
      font-size: 1.3rem;
      order: 1;
    }

    .universal-nav-brand i {
      font-size: 1.5rem;
    }

    /* Enlaces de navegación */
    .universal-nav-left {
      order: 3;
      gap: 15px;
      flex-wrap: wrap;
      justify-content: center;
      margin: 0;
    }

    .universal-nav-left a {
      font-size: 13px;
      padding: 4px 0;
    }

    /* Botones del navbar */
    .universal-nav-right {
      order: 2;
      gap: 8px;
      flex-wrap: wrap;
      justify-content: center;
      margin: 0;
    }

    /* Ajuste de padding para páginas con navbar universal */
    body.universal-navbar-page {
      padding-top: var(--universal-navbar-height-mobile) !important;
    }

    /* Contenido universal con altura ajustada */
    .universal-content {
    min-height: calc(100vh - var(--universal-navbar-height-mobile));
    padding-top: 5px;
  }

    /* Container moderno ajustado */
    .modern-container {
      padding: 1.5rem;
      margin-top: 0;
      min-height: calc(100vh - var(--universal-navbar-height-mobile) - 30px);
    }

    /* Botones universales más pequeños */
    .universal-btn {
      padding: 6px 12px;
      font-size: 12px;
      min-width: 80px;
      white-space: nowrap;
    }

    .universal-btn i {
      font-size: 1rem;
    }
  }

  /* Móviles pequeños (576px y menos) */
  @media (max-width: 576px) {
    :root {
      --universal-navbar-height-mobile: 140px;
    }

    .universal-navbar {
      height: var(--universal-navbar-height-mobile);
      min-height: var(--universal-navbar-height-mobile);
    }

    .universal-nav-container {
      padding: 8px 10px;
      gap: 6px;
    }

    .universal-nav-brand {
      font-size: 1.2rem;
    }

    .universal-nav-brand i {
      font-size: 1.4rem;
    }

    .universal-nav-left a {
      font-size: 12px;
    }

    .universal-btn {
      padding: 5px 10px;
      font-size: 11px;
      min-width: 70px;
    }

    /* Ajuste de padding */
    body.universal-navbar-page {
      padding-top: var(--universal-navbar-height-mobile) !important;
    }

    .universal-content {
      min-height: calc(100vh - var(--universal-navbar-height-mobile));
      padding-top: 10px;
    }

    .modern-container {
      padding: 1rem;
      min-height: calc(100vh - var(--universal-navbar-height-mobile) - 20px);
    }
  }

  /* Móviles muy pequeños (480px y menos) */
  @media (max-width: 480px) {
    :root {
      --universal-navbar-height-mobile: 160px;
    }

    .universal-navbar {
      height: var(--universal-navbar-height-mobile);
      min-height: var(--universal-navbar-height-mobile);
    }

    .universal-nav-container {
      padding: 6px 8px;
      gap: 4px;
    }

    .universal-nav-left {
      gap: 10px;
    }

    .universal-nav-left a {
      font-size: 11px;
    }

    .universal-nav-right {
      gap: 6px;
    }

    .universal-btn {
      padding: 4px 8px;
      font-size: 10px;
      min-width: 60px;
    }

    /* Botones en dos filas si es necesario */
    .universal-nav-right {
      flex-direction: column;
      width: 100%;
    }

    .universal-nav-right .universal-btn {
      width: 100%;
      max-width: 200px;
      margin: 1px 0;
    }

    /* Ajuste de padding */
    body.universal-navbar-page {
      padding-top: var(--universal-navbar-height-mobile) !important;
    }

    .universal-content {
      min-height: calc(100vh - var(--universal-navbar-height-mobile));
      padding-top: 8px;
    }

    .modern-container {
      padding: 0.8rem;
      min-height: calc(100vh - var(--universal-navbar-height-mobile) - 16px);
    }
  }

  /* ================================================
     PROTECCIÓN PARA SCROLL Y CONTENIDO
     ================================================ */

  /* Ajuste de scroll padding para móviles */
  @media (max-width: 768px) {
    html {
      scroll-padding-top: var(--universal-navbar-height-mobile);
    }
  }

  /* Asegurar que el primer elemento tenga margen */
  body.universal-navbar-page > *:first-child:not(.universal-navbar) {
    margin-top: 0 !important;
    padding-top: 0 !important;
  }

  /* Protección adicional para contenido que pueda quedar oculto */
  .universal-navbar-page .main-header,
  .universal-navbar-page .page-title-label,
  .universal-navbar-page .container:first-of-type {
    position: relative;
    z-index: 1;
  }

  /* ================================================
     ORIENTACIÓN LANDSCAPE EN MÓVILES
     ================================================ */
  @media (max-width: 767px) and (orientation: landscape) {
    :root {
      --universal-navbar-height-mobile: 100px;
    }

    .universal-navbar {
      height: var(--universal-navbar-height-mobile);
    }

    .universal-nav-container {
      flex-direction: row;
      justify-content: space-between;
      padding: 5px 15px;
    }

    .universal-nav-left {
      order: 2;
      gap: 20px;
    }

    .universal-nav-right {
      order: 3;
      flex-direction: row;
      gap: 8px;
    }

    .universal-btn {
      padding: 4px 10px;
      font-size: 11px;
    }

    body.universal-navbar-page {
      padding-top: var(--universal-navbar-height-mobile) !important;
    }

    .modern-container {
      padding: 1rem;
      min-height: calc(100vh - var(--universal-navbar-height-mobile) - 20px);
    }
  }

  /* ================================================
     DEBUGGING Y VERIFICACIÓN
     ================================================ */

  /* Solo para debugging - remover en producción */
  /*
  .universal-navbar::after {
    content: 'Navbar Height: ' attr(style);
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    background: red;
    color: white;
    padding: 2px 8px;
    font-size: 10px;
    border-radius: 4px;
    z-index: 9999;
  }
  */