body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f4f4;
    color: #222;
}
header {
    background: #222;
    color: #fff;
    padding: 1em 0;
    text-align: center;
}
nav a {
    color: #fff;
    margin: 0 1em;
    text-decoration: none;
    font-weight: bold;
}
nav a:hover {
    text-decoration: underline;
}
main {
    padding: 2em;
}
section {
    background: #fff;
    padding: 2em;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    margin-bottom: 2em;
}
footer {
    background: #222;
    color: #fff;
    text-align: center;
    padding: 1em 0;
    position: fixed;
    width: 100%;
    bottom: 0;
}
.responsive-img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1em auto;
}
form {
    display: flex;
    flex-direction: column;
    gap: 1em;
}
input, textarea {
    padding: 0.5em;
    border: 1px solid #ccc;
    border-radius: 4px;
}
button {
    background: #007bff;
    color: #fff;
    border: none;
    padding: 0.75em;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1em;
}
button:hover {
    background: #0056b3;
}
@media (max-width: 600px) {
    main, section {
        padding: 1em;
    }
    nav a {
        display: block;
        margin: 0.5em 0;
    }
    footer {
        position: static;
    }
}