.canvas-container {
    position: relative;
    width: 100%;
    max-width: 100%;
    height: auto;
    margin-bottom: 20px;
}

.viewer3d-canvas {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    touch-action: none;
    display: block;
    padding: 4px;
    margin-bottom: 5px;
    line-height: 1.42857143;
    background-color: #fff;
    border: 1px solid #ddd;
    border-radius: 4px;
    cursor: grab;
    transition: border .2s ease-in-out;
}

/* Полноэкранный режим */
:fullscreen .viewer3d-canvas,
:-webkit-full-screen .viewer3d-canvas {
    width: 100vw !important;
    height: 100vh !important;
    max-width: none !important;
    max-height: none !important;
    position: fixed !important;
    top: 0;
    left: 0;
    z-index: 9999;
    padding: 0;
    margin: 0;
}

/* Возврат после fullscreen */
html:not(:fullscreen) .viewer3d-canvas,
body:not(:-webkit-full-screen) .viewer3d-canvas {
    position: relative !important;
    width: 100% !important;
    height: auto !important;
}