body {
    font-family: 'Segoe UI', sans-serif;
    background-color: #0A2647;
    color: #ffffff;
    margin: 0;
    padding: 0;
}
header, footer {
    background-color: #144272;
    padding: 20px;
    text-align: center;
}
nav {
    background-color: #205295;
    text-align: center;
    padding: 12px;
}
nav a {
    color: white;
    margin: 0 12px;
    text-decoration: none;
    font-weight: bold;
}
main {
    padding: 40px;
    max-width: 1000px;
    margin: auto;
}
a.button {
    background-color: #28D17E;
    color: #fff;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: bold;
    display: inline-block;
    margin-top: 20px;
}
.whatsapp {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: #25D366;
    color: white;
    border-radius: 50%;
    padding: 16px;
    text-align: center;
    font-size: 24px;
    text-decoration: none;
}
img {
    width: 100%;
    max-width: 600px;
    display: block;
    margin: 20px auto;
}