body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    overflow: hidden;
    background: #000;
}

/* Background scrolling infini */
.scrolling-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 200%; /* Largeur double pour la répétition */
    height: 100%;
    background: url('fond.png') repeat-x;
    background-size: contain;
    animation: scroll 20s linear infinite;
    z-index: 1;
}

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* Logo en bas */
.bottom-logo {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    max-width: 150px;
    height: auto;
}

/* Overlay pour le démarrage du son */
#overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 20;
}

#play-button {
    padding: 15px 30px;
    background: #fff;
    border: none;
    cursor: pointer;
    font-family: sans-serif;
    font-weight: bold;
}