.nkcdb-stl-viewer {
    position: relative;
    width: 100%;
    height: var(--nkcdb-stl-height, 500px);
    min-height: 220px;
    background: var(--nkcdb-stl-bg, #f4f4f4);
    overflow: hidden;
    border-radius: 8px;
}

.nkcdb-stl-stage,
.nkcdb-stl-stage canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.nkcdb-stl-status,
.nkcdb-stl-help {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.68);
    color: #fff;
    padding: 7px 10px;
    border-radius: 5px;
    font-size: 13px;
    line-height: 1.3;
    pointer-events: none;
    z-index: 3;
}

.nkcdb-stl-status { top: 14px; }
.nkcdb-stl-help { bottom: 14px; }

.nkcdb-stl-viewer.is-ready .nkcdb-stl-status { display: none; }
.nkcdb-stl-viewer.is-error .nkcdb-stl-status { background: rgba(120, 0, 0, 0.78); }

@media (max-width: 600px) {
    .nkcdb-stl-help { font-size: 12px; }
}