body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    background-color: #fff;
    color: #222;
}

header, footer {
    background-color: #1a1a1a;
    color: #f1f1f1;
    padding: 20px;
    text-align: center;
}

main {
    padding: 20px;
    max-width: 1000px;
    margin: auto;
}

h1, h2, h3 {
    color: #175f27;
    margin-top: 30px;
    margin-bottom: 15px;
}

ul, ol {
    padding-left: 20px;
    margin-bottom: 20px;
}

li {
    margin-bottom: 10px;
}

a {
    color: #0077cc;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 20px auto;
    border-radius: 8px;
}

section {
    margin-bottom: 40px;
}

details {
    background-color: #f7f7f7;
    padding: 10px 15px;
    border-radius: 5px;
    margin-bottom: 10px;
    cursor: pointer;
}

details summary {
    font-weight: bold;
    margin-bottom: 5px;
}

@media (max-width: 768px) {
    main {
        padding: 15px;
    }

    img {
        margin: 15px auto;
    }
}