body, html {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100dvh;
    overflow: hidden; /* Prevents scrolling */
    background-color: #000;
    /* CRITICAL FOR MOBILE GAMES: Stops double-tap-to-zoom and pull-to-refresh */
    touch-action: none; 
    -webkit-user-select: none; /* Stops text highlighting */
    user-select: none;
}

#gameCanvas {
    display: block;
    width: 100%;
    height: 100%;
}

/* Hide the message by default */
#rotate-device {
    display: none;
    position: fixed;
    top: 0; 
    left: 0; 
    margin: auto;
    width: 100vw; 
    height: 100dvh;
    background-color: #0a0a1a;
    color: #00ffcc;
    z-index: 9999; /* Always on top */
    align-items: center; 
    justify-content: center;
    font-family: monospace; 
    font-size: 24px; 
    text-align: center;     
}

/* If the phone is held vertically (portrait), hide the game and show the message! */
@media screen and (orientation: portrait) and (max-width: 768px) {
    #gameCanvas {
        display: none;
    }
    #rotate-device {
        display: flex;
    }
}