body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 100vh;
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f9f9f9;
}

main, section, article, header, footer {
    width: 100%;
    max-width: 700px;
    margin: 20px 0;
    padding: 24px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    text-align: center;
}

h1, h2, h3, h4, h5, h6, p {
    text-align: center;
    margin-top: 0;
}

nav {
    margin-bottom: 24px;
}

a {
    color: #3366cc;
    text-decoration: none;
    margin: 0 8px;
}

a:hover {
    text-decoration: underline;
}