#puzzle {
    display: grid;
    border: 2px solid #333;
    background-color: #fff;
    padding: 10px;
    border-radius: 10px;
}

.grid-cell {
    width: 50px;
    height: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 24px;
    font-weight: bold;
    border-radius: 50%;
    cursor: pointer;
    user-select: none;
    transition: background-color 0.2s;
}

.grid-cell.selected {
    background-color: #b3d4fc;
}

.grid-cell.found {
    background-color: #a3e9a4;
    color: white;
}

#words-list li.found-word {
    text-decoration: line-through;
    color: #888;
}

@media (max-width: 600px) {
    .grid-cell {
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
}