body {
    font-family: Arial, sans-serif;
    text-align: center;
    background: linear-gradient(to right, #ff7e5f, #feb47b);
    color: white;
}
.container {
    margin-top: 50px;
}
.board {
    display: grid;
    grid-template-columns: repeat(3, 100px);
    grid-template-rows: repeat(3, 100px);
    gap: 5px;
    justify-content: center;
}
.cell {
    width: 100px;
    height: 100px;
    background: white;
    color: #ff7e5f;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2em;
    font-weight: bold;
    border-radius: 10px;
    cursor: pointer;
}
.cell.taken {
    pointer-events: none;
}
.message {
    margin-top: 20px;
    font-size: 1.5em;
}
.reset {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 1em;
    background: white;
    color: #ff7e5f;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}
.popup {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    color: black;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
}
.popup button {
    margin-top: 10px;
    padding: 10px;
    cursor: pointer;
}