body {
    background-color: #f8f9fa;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.calculator-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: none;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.calculator-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.card-title {
    color: #2c3e50;
    font-weight: 600;
    margin-bottom: 1rem;
}

.card-text {
    color: #6c757d;
    margin-bottom: 1.5rem;
}

.btn-primary {
    background-color: #0d6efd;
    border: none;
    padding: 0.5rem 1.5rem;
    font-weight: 500;
}

.btn-primary:hover {
    background-color: #0b5ed7;
    transform: translateY(-1px);
}

.display-4 {
    color: #2c3e50;
    font-weight: 700;
}

.lead {
    color: #6c757d;
}

h2 {
	font-size: 21px;
}

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

@media (max-width: 768px) {
    .display-4 {
        font-size: 2.5rem;
    }
    
    .lead {
        font-size: 1.1rem;
    }
}