#portal-overlay {
    position: fixed;
    inset: 0;
    z-index: 12000;
    pointer-events: none;
    opacity: 0;
    background: radial-gradient(circle at center, transparent 0%, rgba(0, 0, 0, 0.55) 70%);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.15s ease;
}

#portal-overlay.portal-active {
    opacity: 1;
    pointer-events: auto;
}

#portal-overlay .portal-ring {
    width: 40vmin;
    height: 40vmin;
    border-radius: 50%;
    border: 2px solid var(--accent-color, #e56b1f);
    box-shadow: 0 0 40px var(--accent-glow, rgba(229, 107, 31, 0.45));
    transform: scale(0.2);
    opacity: 0.9;
}

#portal-overlay .portal-core {
    position: absolute;
    width: 8vmin;
    height: 8vmin;
    border-radius: 50%;
    background: var(--accent-color, #e56b1f);
    box-shadow: 0 0 60px var(--accent-glow, rgba(229, 107, 31, 0.6));
    transform: scale(0.3);
}

#portal-overlay.portal-animate .portal-ring {
    animation: portal-tunnel 0.55s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

#portal-overlay.portal-animate .portal-core {
    animation: portal-core 0.55s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes portal-tunnel {
    0% {
        transform: scale(0.15);
        opacity: 0.4;
    }
    100% {
        transform: scale(8);
        opacity: 1;
    }
}

@keyframes portal-core {
    0% {
        transform: scale(0.2);
        opacity: 0.6;
    }
    100% {
        transform: scale(2.5);
        opacity: 1;
    }
}