/* Общие стили */
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f9f9f9;
    color: #333;
}

header {
    background-color: #333;
    color: #fff;
    padding: 20px;
    text-align: center;
}

header h1 {
    margin: 0;
    font-size: 2em;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
    gap: 20px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}

nav ul li a:hover {
    text-decoration: underline;
}

section {
    padding: 20px;
    margin: 20px auto;
    max-width: 800px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

section h2 {
    font-size: 1.8em;
    margin-bottom: 20px;
    color: #333;
}

section h3 {
    font-size: 1.4em;
    margin-top: 20px;
    color: #555;
}

section h4 {
    font-size: 1.2em;
    margin-top: 15px;
    color: #666;
}

section p {
    margin: 10px 0;
    color: #444;
}

section ul {
    margin: 10px 0;
    padding-left: 20px;
}

section ul li {
    margin: 5px 0;
}

footer {
    text-align: center;
    padding: 20px;
    background-color: #333;
    color: #fff;
    margin-top: 20px;
}

/* Адаптив для мобильных устройств */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.5em;
    }

    nav ul {
        flex-direction: column;
        gap: 10px;
    }

    section {
        padding: 15px;
        margin: 15px;
    }

    section h2 {
        font-size: 1.5em;
    }

    section h3 {
        font-size: 1.2em;
    }

    section h4 {
        font-size: 1.1em;
    }
}