body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #222; /* Fond sombre */
    color: #ddd;
    text-align: center;
}
header, footer {
    background: #111; /* Noir */
    color: white;
    padding: 20px;
}
nav {
    display: flex;
    justify-content: center;
    background: #333; /* Gris foncé */
    padding: 15px 0;
    margin-bottom: 20px;
}
nav a {
    text-decoration: none;
    color: white;
    margin: 0 15px;
    font-weight: bold;
    font-size: 18px;
    background: #444; /* Boutons gris foncés */
    padding: 10px 20px;
    border-radius: 5px;
    transition: 0.3s ease;
}
nav a:hover {
    background: #666; /* Survol gris clair */
}
section {
    margin: 20px auto;
    padding: 20px;
    background: #333; /* Fond des sections */
    border-radius: 10px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
    max-width: 800px;
    text-align: center;
}
.btn {
    display: inline-block;
    margin-top: 60px; /* Positionne le bouton plus bas */
    background: #555; /* Gris foncé */
    color: white;
    padding: 15px 30px;
    font-size: 18px;
    font-weight: bold;
    text-decoration: none;
    border-radius: 5px;
    transition: 0.3s ease;
}
.btn:hover {
    background: #777; /* Gris clair */
}
img {
    max-width: 100%;
    height: auto;
    margin: 20px auto;
    display: block; /* Centre les images */
}
footer p {
    font-size: 14px;
    margin: 5px 0;
}
@media (max-width: 600px) {
    nav {
        flex-direction: column;
    }
    nav a {
        margin: 5px 0;
    }
}