.app{text-align:center;font-family:Arial,sans-serif}.start-button,.end-button{margin-top:1.25rem;padding:1rem 1.1rem;color:#fff;border:none;cursor:pointer;background-color:var(--primary-color)}.board-container{display:flex;flex-direction:column;align-items:center;justify-content:center}.container{display:flex;justify-content:center;align-items:center;flex-direction:column;gap:1.25rem}.input-container{display:flex;flex-direction:column;align-items:center;gap:1rem}.h1__header{font-size:1.5rem;color:#3498db}:root{--primary-color: #3498db;--secondary-color: #2ecc71;--font-color: #333;--card-size: 100px;--card-border-radius: 10px}.card{width:6.25rem;height:6.25rem;background-color:#3498db;border-radius:.625rem;display:flex;justify-content:center;align-items:center;font-size:1.5rem;color:#fff;cursor:pointer;transition:transform .3s,background-color .3s}.card.flipped{background-color:#2ecc71;transform:rotateY(180deg)}.card.matched{background-color:#2ecc71;cursor:not-allowed}.card:hover{background-color:#75b9e7}@media (max-width: 768px){.card{width:4.25rem;height:4.25rem}}.board{display:grid;max-width:93.75rem;grid-template-columns:repeat(6,1fr);gap:1.25rem;padding:1.25rem}@media (max-width: 1200px){.board{grid-template-columns:repeat(4,1fr)}}@media (max-width: 800px){.board{grid-template-columns:repeat(4,1fr)}}.game-stats p{margin:.5rem}.round-history{width:100%;border-collapse:collapse;margin:1rem 0}.round-history th,.round-history td{border:1px solid #ddd;padding:.5rem;text-align:left}.round-history th{background-color:#f2f2f2}.round-history tbody tr:nth-child(2n){background-color:#f9f9f9}.round-history tbody tr:nth-child(odd){background-color:#fff}