body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    display: flex;
	justify-content: center;
    align-items: center;
    flex-direction: column;
    min-height: 100vh;
}

.responsive-image {
    display: none;	/*keep hide all images by default*/
}

.large-image {
    display: block;	/*show - large screen image - on large screens*/
}

header {
    background: #333;
    color: #fff;
    padding: 10px 0;
    text-align: center;
}

footer {
    background: #333;
    color: #fff;
    padding: 10px 0;
    text-align: center;
}

header h1 {
    margin: 0;
}

nav ul {
    list-style: none;
    padding: 0;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

nav ul li {
    margin: 5px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    padding: 10px;
    display: block;
    background: #444;
    border-radius: 5px;
}

nav ul li a:hover {
    background: #555;
}

section ul li a {
    text-decoration: none
}

section ul li a:hover {
    background: #555;
}

footer a {
    text-decoration: none
}

footer a:hover {
    background: #555;
}


section {
    padding: 20px;
    margin: 20px;
    background: #fff;
    border-radius: 5px;
}

section img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
}

/* Styles spécifiques pour la section de contact */
section#contact {
    display: flex;
    flex-direction: column;
    align-items: center;
}

section#contact form {
    display: flex;
    flex-direction: column;
    max-width: 600px;
    width: 100%;
}

section#contact form label {
    margin-top: 10px;
}

section#contact form input,
section#contact form textarea {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

section#contact form button {
    margin-top: 20px;
    padding: 10px;
    background: #333;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

section#contact form button:hover {
    background: #555;
}


footer {
    text-align: center;
    padding: 10px 0;
    background: #333;
    color: #fff;
    margin-top: auto;
}

@media (max-width: 600px) {
    nav ul {
        flex-direction: column;
        align-items: center;
    }

    nav ul li {
        margin: 10px 0;
    }
}

main {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 20px;
}

@media (min-width: 768px) {
    main {
        grid-template-columns: repeat(2, 1fr);
    }
}


@media (max-width: 768px) {
    /*on little screen image*/
    .large-image {
        display: none;	/*hide - large screen image*/
    }
    .small-image {
        display: block;	/*show - little screen image*/
    }
}

@media (min-width: 1024px) {
    main {
        grid-template-columns: repeat(3, 1fr);
    }
}