body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -khtml-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.game-board {
    aspect-ratio: 1/1;
}

.tile {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    border-radius: 0.5rem;
    transition: all 0.1s ease-in-out;
}

.tile-2 {
    background-color: #fef3c7;
    color: #92400e;
}

.tile-4 {
    background-color: #fde68a;
    color: #92400e;
}

.tile-8 {
    background-color: #fcd34d;
    color: #92400e;
}

.tile-16 {
    background-color: #fbbf24;
    color: #92400e;
}

.tile-32 {
    background-color: #f59e0b;
    color: white;
}

.tile-64 {
    background-color: #d97706;
    color: white;
}

.tile-128 {
    background-color: #b45309;
    color: white;
    font-size: 1.2rem;
}

.tile-256 {
    background-color: #92400e;
    color: white;
    font-size: 1.2rem;
}

.tile-512 {
    background-color: #78350f;
    color: white;
    font-size: 1.2rem;
}

.tile-1024 {
    background-color: #451a03;
    color: white;
    font-size: 1rem;
}

.tile-2048 {
    background-color: #1e1e1e;
    color: #fbbf24;
    font-size: 1rem;
}

.empty {
    background-color: rgba(253, 230, 138, 0.3);
}

.game-over {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    z-index: 100;
    border-radius: 0.5rem;
}

@media (max-width: 480px) {
    .tile {
        font-size: 1rem;
    }
    .tile-128, .tile-256, .tile-512 {
        font-size: 0.9rem;
    }
    .tile-1024, .tile-2048 {
        font-size: 0.8rem;
    }
}