.board { display: flex; justify-content: center; margin: 12px auto 10px; }
.board canvas { display: block; border-radius: 22px; border: 1px solid var(--line); box-shadow: 0 20px 50px -24px rgba(0, 0, 0, 0.7); touch-action: manipulation; cursor: pointer; }
.board canvas:focus-visible { outline: 2px solid #a78bfa; outline-offset: 3px; }
.tip { text-align: center; color: var(--muted); font-size: 13px; margin: 0 0 8px; }