html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
    /* Prevent mobile browser zoom — canvas handles its own pinch/zoom */
    touch-action: none;
    user-select: none;
    -webkit-user-select: none;
    overscroll-behavior: none;
}

body.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f5f7fb;
}

.boot-loader {
    display: flex;
    align-items: center;
    justify-content: center;
}