html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    width: 100%;
    overflow: hidden;
    font-family: Arial, sans-serif;
    background: black;
}

/* Fallback image plein écran */
.fallback-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('fallback.png') center center / cover no-repeat;
    z-index: 0;
}

/* Vidéo plein écran */
.video-background {
    position: fixed;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    transform: translate(-50%, -50%);
    object-fit: cover;
    z-index: 1;
}

/* Overlay semi-transparent */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.2);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    z-index: 2;
}

/* Logo centré */
.logo {
    width: 400px;
    height: auto;
    margin-bottom: 30px;
    filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.5));
}

/* Boutons FR/NL alignés */
.lang-buttons {
    display: flex;
    gap: 30px;
    justify-content: center;
}

/* Boutons stylisés et largeur réduite */
.btn {
    font-size: 1.6rem;
    padding: 10px 0;
    width: 120px;               /* largeur réduite */
    text-align: center;
    color: white;
    border: 2px solid white;
    border-radius: 40px;
    text-decoration: none;
    transition: 0.3s;
    backdrop-filter: blur(4px);
}

.btn:hover {
    background: white;
    color: black;
}

/* Animation fade-in */
.fade-in {
    opacity: 0;
    animation: fadeUp 1.5s ease forwards;
}

.fade-in:nth-child(1) {
    animation-delay: 0.3s;
}

.fade-in:nth-child(2) {
    animation-delay: 0.8s;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}