.pt-curtain {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: var(--pt-color, #000);
    z-index: 999999;
    pointer-events: none;
    transform: translateY(-100%);
    transition: transform var(--pt-duration) var(--pt-easing);
}

.pt-transitioning-curtain .pt-curtain {
    transform: translateY(0);
}

.pt-fade-in {
    opacity: 0;
    animation: ptFadeIn var(--pt-duration) var(--pt-easing) forwards;
}
@keyframes ptFadeIn {
    to { opacity: 1; }
}

.pt-transitioning-fade {
    opacity: 0;
    transition: opacity var(--pt-duration) var(--pt-easing);
}

/* Add other transition styles as needed (slide, zoom) */