:root {
    --primary-color: #4CAF50;
    --secondary-color: #2196F3;
    --background-color: #f8f9fa;
    --text-color: #333;
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--background-color);
}

.hero-section {
    background: linear-gradient(rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.9)),
                url('https://images.unsplash.com/photo-1512621776951-a57141f2eefd');
    background-size: cover;
    background-position: center;
    padding: 4rem 0;
}

.calculator-section {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    margin: 2rem 0;
}

.result-box {
    text-align: center;
    padding: 1.5rem;
    background-color: var(--background-color);
    border-radius: 8px;
    margin: 1rem 0;
}

.result-box h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.info-card {
    border-left: 4px solid var(--primary-color);
    padding: 1rem;
    margin: 1rem 0;
    background-color: white;
}

footer {
    background-color: #333;
    color: white;
    padding: 2rem 0;
    margin-top: 4rem;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(76, 175, 80, 0.25);
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: #388E3C;
    border-color: #388E3C;
}