.navbar {
    transition: background-color 0.4s ease, backdrop-filter 0.4s ease;
    background-color: rgba(0, 0, 0, 0); /* komplett transparent */
    color: #000;
}

/* Zustand beim Scrollen */
.navbar.scrolled {
    background-color: #131a2ad1; /* wird sichtbar */
    backdrop-filter: blur(8px); /* optional sexy Effekt */
    color: #fff;
}