body {
    font-family: Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
}

#game-board-container {
    position: relative;
    /* make sure board is centered inside its shell */
    display: block;
}

.board-space {
    position: absolute;
    box-sizing: border-box;
    cursor: pointer;
    background: transparent;
    border: 0;
}

.board-space:hover {
    background: rgba(255,255,255,0.02);
}

/* ensure the page fills viewport so centering works */
html, body, .page { height: 100%; }

/* center the board shell vertically in the viewport */
.full-center-wrapper { min-height: calc(100vh - 120px); }