/* ==========================================================================
   VARIABLES DE DISEÑO Y TEMAS (Soporte Nativo para Bootstrap 5)
   ========================================================================== */

/* Variables para Modo Claro (Por defecto) */
:root, [data-bs-theme="light"] {
    --bg-gradient-nav: linear-gradient(180deg, #0f172a 0%, #16213e 100%);
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --card-shadow-hover: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Variables para Modo Oscuro */
[data-bs-theme="dark"] {
    --bg-gradient-nav: linear-gradient(180deg, #0f172a 0%, #16213e 100%);
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --card-shadow-hover: 0 10px 20px -3px rgba(0, 0, 0, 0.7), 0 4px 12px -4px rgba(0, 0, 0, 0.5);

    body {
        background-color: #0b1329 !important;
    }
}

/* ==========================================================================
   ESTILOS GENERALES Y ANIMACIONES
   ========================================================================== */
body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.transition-all {
    transition: var(--transition-smooth);
}

/* Efecto de elevación sutil para tarjetas interactivas */
.card-interactive {
    transition: var(--transition-smooth);
    box-shadow: var(--card-shadow);
    border: 1px solid rgba(0,0,0,0.05) !important;
}

[data-bs-theme="dark"] .card-interactive {
    border: 1px solid rgba(255,255,255,0.05) !important;
}

.card-interactive:hover {
    transform: translateY(-3px);
    box-shadow: var(--card-shadow-hover);
}

/* ==========================================================================
   MENÚ LATERAL RESPONSIVE (NavMenu)
   ========================================================================== */
.sidebar-container {
    background: var(--bg-gradient-nav);
    min-height: 100vh;
    box-shadow: 2px 0 12px rgba(0,0,0,0.1);
    transition: var(--transition-smooth);
}

/* Estilos refinados para los enlaces de navegación */
.nav-pills .nav-link {
    color: rgba(255, 255, 255, 0.75) !important;
    font-weight: 500;
    border-left: 3px solid transparent;
    border-radius: 0 8px 8px 0 !important; /* Estilo pestaña moderna */
    transition: var(--transition-smooth);
}

    .nav-pills .nav-link:hover {
        color: #fff !important;
        background-color: rgba(255, 255, 255, 0.08) !important;
        border-left-color: rgba(255, 255, 255, 0.4);
        padding-left: 1.25rem !important;
    }

    .nav-pills .nav-link.active {
        color: #fff !important;
        background-color: #3b82f6 !important; /* Azul eléctrico moderno */
        border-left-color: #60a5fa;
        font-weight: 600;
        box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
    }

/* ==========================================================================
   DISEÑO EXCLUSIVO ENTORNO LECTURA Y EXAMEN
   ========================================================================== */
.contenido-lectura p {
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

/* Botones de respuesta del test */
.btn-test-option {
    border: 2px solid rgba(0,0,0,0.08) !important;
    background-color: var(--bs-card-bg);
    text-align: left;
    padding: 1rem 1.25rem;
    border-radius: 10px;
    transition: var(--transition-smooth);
}

[data-bs-theme="dark"] .btn-test-option {
    border: 2px solid rgba(255,255,255,0.08) !important;
}

.btn-test-option:hover:not([disabled]) {
    border-color: #3b82f6 !important;
    background-color: rgba(59, 130, 246, 0.04);
    transform: translateX(4px);
}

/* Adaptabilidad responsive estricta para tablas de datos masivos */
.table-responsive-custom {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

/* Color de los titulos de la barra de menu lateral */
.nav-title {
    color: #fff !important;
}