body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #FDFBF6; 
    color: #3A3B3C; 
}

.container {
    max-width: 1000px;
    background-color: #ffffff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
}

header h1 {
    color: #0D2F4F; 
}

section h2 {
    color: #1E507A; 
    margin-bottom: 1rem;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
}

.icon {
    width: 24px;
    height: 24px;
    margin-right: 8px;
}

.button-icon {
    width: 20px;
    height: 20px;
    margin-right: 8px;
    filter: invert(100%) sepia(0%) saturate(0%) hue-rotate(0deg) brightness(200%) contrast(100%); 
}

.form-label {
    font-weight: 500;
}

.form-control:focus {
    border-color: #B08D57; 
    box-shadow: 0 0 0 0.2rem rgba(176, 141, 87, .25); 
}

.btn-primary {
    background-color: #B08D57; 
    border-color: #B08D57;
    padding: 10px 20px;
    font-size: 1.1rem;
    color: #FFFFFF; 
}

.btn-primary:hover {
    background-color: #937047; 
    border-color: #937047;
    color: #FFFFFF;
}

#resultsArea h2 {
    color: #1E507A; 
}

.card-header {
    background-color: #F0F0F0; 
    font-weight: bold;
    color: #0D2F4F; 
}

.list-group-item span.badge {
    font-size: 0.9rem;
    padding: 0.5em 0.8em;
}

#resInversionInicialTotal, #resGastosOperativosAnuales, #resGastosFinanciacionAnuales { background-color: #C0392B !important; } 
#resIngresosAnualesNetos { background-color: #27AE60 !important; } 
#resFlujoCajaAnualNeto, #resBeneficioNetoTotalSinReventa, #resBeneficioNetoTotalConReventa { background-color: #2980B9 !important; } 
#resRoiAnual, #resRoiTotalSinReventa, #resRoiTotalConReventa { background-color: #8E44AD !important; } 
#resPaybackPeriod { background-color: #F39C12 !important; color: #FFFFFF !important; } 

.needs-validation input:invalid {
    border-color: #C0392B; 
}

.needs-validation input:valid {
    border-color: #27AE60; 
}

footer {
    padding-top: 20px;
    border-top: 1px solid #dee2e6; 
}