.game-container{max-width:800px;margin:0 auto;padding:20px;text-align:center}.offline-message{background-color:gold;color:#333;padding:10px;margin-bottom:20px;border-radius:4px}.game-stats{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.card-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:15px;margin-top:20px}.card{height:120px;perspective:1000px;cursor:pointer}.card-inner{position:relative;width:100%;height:100%;text-align:center;transition:transform .6s;transform-style:preserve-3d}.card.flipped .card-inner{transform:rotateY(180deg)}.card-front,.card-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:8px;display:flex;align-items:center;justify-content:center}.card-front{background-color:var(--primary-color);border:2px solid #3a80d2}.card-back{background-color:#fff;transform:rotateY(180deg);border:2px solid var(--border-color);font-size:36px}.card.matched .card-back{background-color:#e6ffe6;border-color:#0c0}button{background-color:var(--primary-color);color:#fff;border:none;padding:10px 20px;border-radius:4px;cursor:pointer;font-size:16px}button:hover{background-color:#3a80d2}.win-message{margin-top:40px;padding:20px;background-color:#e6ffe6;border-radius:8px;border:2px solid #00cc00}@media (max-width: 600px){.card-grid{grid-template-columns:repeat(3,1fr)}.card{height:100px}}