body{
    margin:0;
    padding:0;
    background:#0b4f8a;
    font-family:Arial, Helvetica, sans-serif;
    color:white;
    text-align:center;
}

.contenedor{
    margin:20px auto;
    width:95%;
    max-width:900px;
}

h1{
    font-size:42px;
    margin-bottom:10px;
}

#turno{
    margin-bottom:20px;
}

#mensaje{
    margin-top:20px;
    color:#FFD700;
    min-height:40px;
}

#tablero{
    display:grid;
    grid-template-columns:repeat(7,80px);
    grid-template-rows:repeat(6,80px);
    gap:8px;
    justify-content:center;

    background:#003d80;
    padding:15px;
    border-radius:15px;

    box-shadow:0px 0px 20px rgba(0,0,0,.4);
}

.casilla{
    width:80px;
    height:80px;

    background:white;

    border-radius:50%;

    cursor:pointer;

    transition:.2s;
}

.casilla:hover{
    transform:scale(1.08);
}

.roja{
    background:#e60000;
}

.amarilla{
    background:#ffd400;
}

.botones{
    margin-top:25px;
}

button{

    background:#28a745;
    color:white;

    border:none;

    padding:15px 35px;

    border-radius:10px;

    font-size:20px;

    cursor:pointer;
}

button:hover{
    background:#218838;
}

@media(max-width:700px){

    #tablero{

        grid-template-columns:repeat(7,45px);
        grid-template-rows:repeat(6,45px);

        gap:5px;
    }

    .casilla{

        width:45px;
        height:45px;
    }

}