:root {
    --brand-light-green: #e9f5ec;
    --transition-speed: 0.3s;
}



.calculator-card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    overflow: hidden;
}

    .calculator-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 8px 30px rgba(0,0,0,0.12);
    }

.nav-tabs {
    border-bottom: 2px solid #e9f5ec;
}

    .nav-tabs .nav-link {
        color: #666;
        border: none;
        padding: 1rem 1.5rem;
        font-weight: 600;
        transition: all var(--transition-speed);
    }

        .nav-tabs .nav-link.active {
            color: var(#1a5e2b);
            background: transparent;
            border-bottom: 3px solid #1a5e2b;
        }

.btn-calculate {
    background-color: #1a5e2b;
    color: white;
    border: none;
    padding: 10px 25px;
    font-weight: 500;
    border-radius: 6px;
    transition: opacity var(--transition-speed);
}

    .btn-calculate:hover {
        opacity: 0.9;
        color: white;
    }

.result-box {
    display: none;
    background-color: #e9f5ec;
    border-radius: 8px;
    padding: 1.5rem;
    margin-top: 1.5rem;
    border-left: 5px solid #1a5e2b;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}