/* Specific styles for index.html */
    #board{border:3px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow),0 0 0 1px var(--gold-dim);display:block;width:100%;max-width:500px;height:auto;margin:0 auto;touch-action:none;-ms-touch-action:none;user-select:none;-webkit-user-select:none;transition: border-color 0.4s ease, box-shadow 0.4s ease;}
    .piece-417db,.square-55d63{touch-action:none;-ms-touch-action:none}
    .board-hint{font-size:0.8rem;color:var(--text-muted);font-style:italic;text-align:center;max-width:480px;line-height:1.4;margin:4px 0;transition: color 0.4s ease;}