* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

nav {
    background: #333;
    color: #fff;
    padding: 15px 0;
    text-align: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    width: 100%;
}

nav a {
    color: #fff;
    text-decoration: none;
    padding: 10px 20px;
    display: inline-block;
    transition: 0.3s;
}

nav a:hover {
    background: #555; 
    color: #ff0;
}

a {
    color: #007BFF; 
    text-decoration: none;
    transition: 0.3s;
}

a:hover {
    color: #0056b3; 
    text-decoration: underline;
}

a:visited {
    color: #007BFF;
}

.container {
    max-width: 1100px; 
    margin: 0 auto; 
    padding: 20px;
}

button {
    background: #007BFF;
    color: white;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background: #0056b3;
}

footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 20px 0;
    margin-top: 40px;
}

@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    nav a {
        display: block;
        margin: 5px 0;
    }
    .container {
        padding: 10px;
    }
}