body {
    font-family: Arial, sans-serif;
    background-color: #ffffff;
    color: #201c3c;
    margin: 0;
}

.top-banner {
    width: 100%;
    text-align: center;
    background-color: transparent;
    margin: 10px 0; /*top&bottom left&right*/
}

.top-banner img {
    max-width: 100%;
    height: auto;
    max-height: 20vh;
    display: block;
    margin: auto;
}

header {
    display: flex;
    align-items: center;
    padding: 10px 20px;
    background-color: transparent;
}

nav {
    background-color: #201c3c;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

nav a {
    color: #ffffff;
    padding: 14px 20px;
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.3s, color 0.3s;
}

nav a:hover {
    background-color: #ffffff;
    color: #201c3c;
}

section {
    padding: 40px;
    max-width: 1000px;
    margin: auto;
}

.img-galerie {
    display: flex;
    justify-content: center;
    flex-direction: row;
    --img-nb : calc(3 + 1); /*+1 pour faire les marges*/
}

.img-galerie img {
    max-width: calc(100vw/(var(--img-nb)));
    aspect-ratio: 1;
    margin: 0  calc(100vw/(2*var(--img-nb)*var(--img-nb)));
}

footer {
    background-color: #201c3c;
    color: #ffffff;
    text-align: center;
    padding: 20px;
}

.social-links a {
    text-decoration: none;
    color: #201c3c;
}

.social-links a:hover {
    color: #66fcf1;
    text-decoration: underline;
}

.video-container {
    position: relative;
    width: 100%;
    max-width: 100%;
    padding-bottom: 56.25%;
    height: 0;
    margin: 20px auto;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

h2, h3 {
    color: #201c3c;
}

a {
    color: #201c3c;
}

a:hover {
    color: #66fcf1;
}

.cta-button {
    background-color: #201c3c;
    color: #ffffff;
    padding: 12px 24px;
    text-decoration: none;
    font-size: 1.1em;
    font-weight: bold;
    border-radius: 6px;
    display: inline-block;
    transition: background-color 0.3s, color 0.3s;
}

.cta-button:hover {
    background-color: #66fcf1;
    color: #201c3c;
}

.social-links ul {
    list-style: none;
    padding-left: 0;
}

.social-links li {
    margin: 5px 0;
}