:root {
    --bg-color: #1e1e3f; /* Deep blue fallback */
}

body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

canvas {
    display: block;
    width: 100vw;
    height: 100vh;
    /* GPU acceleration optimizations */
    transform: translateZ(0);
    will-change: contents;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* Screen reader only class */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}