/* Общие стили */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background-color: #2c3e50;
    color: #ecf0f1;
    padding: 1em 0;
}

header nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
}

header nav ul li {
    margin: 0 1em;
}

header nav ul li a {
    color: #ecf0f1;
    text-decoration: none;
}

main {
    padding: 2em;
}

section {
    margin-bottom: 2em;
}

footer {
    background-color: #2c3e50;
    color: #ecf0f1;
    text-align: center;
    padding: 1em 0;
    position: fixed;
    width: 100%;
    bottom: 0;
}

/* Адаптивность */
@media (max-width: 768px) {
    header nav ul {
        flex-direction: column;
        align-items: center;
    }

    header nav ul li {
        margin: 0.5em 0;
    }
}