/* Overlay blanc */
#transition-overlay {
    position: fixed;
    inset: 0;
    background: white;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.45s ease-out;
}

/* Activation */
#transition-overlay.active {
    opacity: 1;
    pointer-events: all;
}

/* Logo au centre */
#transition-logo {
    width: 140px;
    opacity: 0;
    transform: translate(0, 0) scale(0.9);
    transition:
        opacity 0.6s ease-out,
        transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
}

/* Étape 1 : fade-in + léger zoom */
#transition-overlay.fadein #transition-logo {
    opacity: 1;
    transform: scale(1);
}

/* Étape 2 : déplacement vers le header */
#transition-overlay.moveup #transition-logo {
    transform: translate(var(--logo-x), var(--logo-y)) scale(0.55);
}