body {
    background-color: #f8f9fa;
}

#loading-overlay {
    display: flex !important; /* Override inline style when active */
}

.card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.nav-tabs .nav-link {
    color: #495057;
}

.nav-tabs .nav-link.active {
    color: #0d6efd;
    font-weight: bold;
}

/* Utilidad para ocultar/mostrar */
.d-none {
    display: none !important;
}

.balance-positive { color: #198754; }
.balance-negative { color: #dc3545; }

#loading-overlay.d-none {
    display: none !important;
}