body {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f4f4f4;
}
header {
    background: #2c3e50;
    color: #fff;
    text-align: center;
    padding: 1rem;
}
nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 1rem;
}
nav a {
    color: #fff;
    text-decoration: none;
}
nav a:hover {
    color: #3498db;
}
main {
    padding: 2rem;
    text-align: center;
}
footer {
    background: #2c3e50;
    color: #fff;
    text-align: center;
    padding: 1rem;
    width: 100%;
}
form {
    max-width: 300px;
    margin: 0 auto;
    }
input, textarea, button {
    padding: 0.5rem;
    margin: 0.5rem 0;
    width: 100%;
    border: 1px solid #333;
}
textarea {
    height: 100px;
}
button, .social-btn {
    background: #2c3e50;
    color: #fff;
    border: none;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    padding: 0.5rem 1rem;
}
button:hover, .social-btn:hover {
    background: #3498db;
    color: #fff;
}
img {
    max-width: 100%;
    height: auto;
}
@media (max-width: 600px) {
    nav ul {
        flex-direction: column;
        text-align: center;
    }
}