* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background-color: #000000;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
}

/* Master canvas: 12,800px wide by 12,960px tall */
.grid-container {
    width: 7680px !important;
    min-width: 7680px !important;
    height: 7680px !important;
    min-height: 7680px !important;
    display: block !important;
    margin: 0;
    padding: 0;
}

/* Strict horizontal rows */
.canvas-row {
    display: flex !important;
    flex-direction: row !important;
    flex-wrap: nowrap !important;
    width: 7680px !important;
    min-width: 7680px !important;
    height: 1440px !important;
    min-height: 1440px !important;
    margin: 0;
    padding: 0;
}

/* Rigid panel cell */
.panel {
    flex: 0 0 2560px !important;
    width: 2560px !important;
    min-width: 2560px !important;
    max-width: 2560px !important;
    height: 1440px !important;
    min-height: 1440px !important;
    max-height: 1440px !important;
    margin: 0;
    padding: 0;
    position: relative;
    overflow: hidden;
}

.panel img {
    display: block;
    width: 2560px !important;
    height: 1440px !important;
    min-width: 2560px !important;
    min-height: 1440px !important;
    object-fit: fill;
    margin: 0;
    padding: 0;
}