body {
    font-family: Arial, sans-serif;
    background: #f6f8fa;
    margin: 0;
    padding: 0;
    color: #222;
}

nav {
    background: #0f172a;
    padding: 12px 20px;
}

nav a {
    color: #fff;
    text-decoration: none;
    margin-right: 15px;
    font-weight: bold;
}

nav a:hover {
    text-decoration: underline;
}

.container {
    max-width: 1100px;
    margin: auto;
    padding: 30px 20px;
    background: white;
}

h1, h2, h3 {
    color: #0f172a;
}

button, .btn {
    background: #2563eb;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
}

button:hover, .btn:hover {
    background: #1d4ed8;
}