body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    color: #333;
}

header {
    background-color: #f4f4f4;
    padding: 1rem;
    text-align: center;
}

nav a {
    margin: 0 1rem;
    text-decoration: none;
    color: #007bff;
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

section {
    margin-bottom: 2rem;
}

h1, h2, h3 {
    color: #2c3e50;
}

table {
    border-collapse: collapse;
    width: 100%;
    margin: 1rem 0;
}

th, td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: center;
}

th {
    background-color: #f2f2f2;
}

.operator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
}

.example {
    margin-bottom: 2rem;
}

#calculator {
    border: 1px solid #ddd;
    padding: 1rem;
    border-radius: 5px;
}

form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 400px;
}

input, select, button {
    padding: 0.5rem;
    font-size: 1rem;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background-color: #0056b3;
}

#table-container {
    margin-top: 2rem;
}

footer {
    background-color: #f4f4f4;
    text-align: center;
    padding: 1rem;
    margin-top: 2rem;
}

@media (max-width: 768px) {
    nav a {
        display: block;
        margin: 0.5rem 0;
    }
    .operator-grid {
        grid-template-columns: 1fr;
    }
}