html, body {
    height: 100%;
    margin: 0;
    font-family: 'Rubik', sans-serif;
    background-color: #f5f5f5;
}

.heading {
    font-size: 2.5rem;
    color: #333;
}

.game {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.difficulty-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.tile-container {
    display: grid;
    grid-template-columns: repeat(2, 150px);
    gap: 20px;
    justify-content: center;
    align-items: center;
}

.tile {
    width: 150px;
    height: 150px;
    border-radius: 10px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.3s;
}

.tile-red { background-color: #f25022; }
.tile-green { background-color: #7fba00; }
.tile-yellow { background-color: #ffb900; }
.tile-blue { background-color: #00a4ef; }

.tile:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
}

.tile.activated {
    animation: pulse 0.5s;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.info-section {
    font-size: 1.2rem;
    font-weight: bold;
}

.credit-section {
    font-size: 0.9rem;
    text-align: center;
    color: #555;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .tile-container {
        grid-template-columns: repeat(2, 100px);
        gap: 15px;
    }
    .tile {
        width: 100px;
        height: 100px;
    }
    .heading {
        font-size: 2rem;
    }
}