:root {
    --cell-size: 100px;
    --gap-size: 12px;
}

body {
    text-align: center;
    background-image: radial-gradient(
        rgb(21,21,69),
        rgb(13,13,44),
        rgb(9,9,32),
        rgb(5,5,17)
    );
    min-height: 100vh;
    margin: 0;
    padding: 30px 10px;
    color: white;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h1 {
    font-size: clamp(28px, 6vw, 48px);
    margin-bottom: 10px;
}

select {
    padding: 8px 14px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 16px;
}

.board {
    display: grid;
    grid-template-columns: repeat(3, var(--cell-size));
    gap: var(--gap-size);
    justify-content: center;
    margin: 20px auto;
}

.cell {
    width: var(--cell-size);
    height: var(--cell-size);
    background-color: #cbe8ff;
    font-size: calc(var(--cell-size) * 0.6);
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: black;
    border-radius: 12px;
}

.cell:hover {
    background-color: #a3d1ff;
}

.cell.win {
    background-color: #7dd3fc;
}

#status {
    font-size: clamp(16px, 4vw, 22px);
    margin-top: 15px;
}

button {
    border-radius: 20px;
    background-color: #cbe8ff;
    padding: 10px 24px;
    font-size: 16px;
    cursor: pointer;
    border: 3px solid black;
    margin-top: 15px;
}

button:hover {
    background-color: #a3d1ff;
}

@media (max-width: 480px) {
    :root {
        --cell-size: 80px;
        --gap-size: 8px;
    }

    button {
        width: 90%;
        max-width: 280px;
    }
}

@media (max-width: 360px) {
    :root {
        --cell-size: 70px;
    }
}