button { font: inherit; border: 0; cursor: pointer; }
button:focus-visible, a:focus-visible { outline: 3px solid #5c4635; outline-offset: 4px; }
.score-container::after { content: "得分"; }
.best-container::after { content: "最高"; }
.game-explanation { line-height: 1.8; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }