body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f4f4;
    color: #222;
}
header {
    background: #222;
    color: #fff;
    padding: 2rem 0 1rem 0;
    text-align: center;
}
nav {
    background: #444;
    text-align: center;
}
nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: inline-block;
}
nav ul li {
    display: inline;
    margin: 0 1.5rem;
}
nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.2s;
}
nav ul li a:hover {
    color: #ffd700;
}
section {
    background: #fafbfc;
    color: #222;
    margin: 2.5rem auto;
    padding: 2.2rem 2rem 2rem 2rem;
    max-width: 750px;
    border-radius: 14px;
    box-shadow: 0 4px 24px 0 rgba(34,34,34,0.08), 0 1.5px 4px 0 rgba(34,34,34,0.04);
    transition: box-shadow 0.2s;
}
section:hover {
    box-shadow: 0 8px 32px 0 rgba(34,34,34,0.13), 0 2px 8px 0 rgba(34,34,34,0.07);
}
h1, h2 {
    margin-top: 0;
}
footer {
    text-align: center;
    padding: 0.05rem 0;
    background: rgba(34,34,34,0.7);
    color: #fff;
    position: fixed;
    width: 100%;
    bottom: 0;
    z-index: 10;
}

footer p {
    font-size: 0.18rem;
    margin: 0;
    letter-spacing: 0.5px;
    opacity: 0.7;
}
@media (max-width: 600px) {
    section {
        padding: 1rem;
    }
    nav ul li {
        margin: 0 0.5rem;
    }
}