#part-zoom {
    display: none;
    position: fixed;
    z-index: 4000;
    pointer-events: none;
    padding: 6px;
    background: var(--surface, #1c1c21);
    border: 1px solid var(--border, #2c2c33);
    border-radius: 10px;
    box-shadow: 0 10px 32px rgba(0, 0, 0, 0.45);
}
#part-zoom.is-on { display: block; }
#part-zoom img {
    display: block;
    max-width: min(72vw, 560px);
    max-height: min(72vh, 560px);
    width: auto;
    height: auto;
    object-fit: contain;
}
img.thumb { cursor: zoom-in; }