body{
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    text-align: center;
    color: #e0f7fa;
    font-family: 'Segoe UI', Tahoma, Verdana, sans-serif;
    height:100vh;
}

h1{
    text-align: center;
    color:#00e5ff;
}

.container{
    height:70vh;
    display:flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
}

.GameBox{
    height:60vmin;
    width:60vmin;
    display:flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap:1.5vmin;
}

.cell{
    height:18vmin;
    width:18vmin;
    border-radius:1rem;
    font-size:8vmin;
    background-color:rgba(255, 255, 255, 0.08);
    color: #00e5ff;
    border: 1px solid rgba(0, 229, 255, 0.3);
    transition: transform 0.15s ease, box-shadow 0.3s ease;
}

.cell:hover{
    transform:scale(1.1);
    box-shadow: 0 0 10px #00e5ff;
}

.Restart{
    padding: 1rem 2rem;
    background-color: transparent;
    color: #00e5ff;
    border-radius: 1.5rem;
    border: 2px solid #00e5ff; 
    transition: transform 0.25s ease-in-out, box-shadow 0.3s ease;
}

.Restart:hover{
    transform: scale(1.1);
    box-shadow: 0 0 15px #00e5ff; 
}

.Message{
    text-align: center;
    font-size:1.5rem;
    font-weight:700;
    color:#00ffea; 
    opacity:0;
    transition: opacity 0.5s ease-in-out;
}

.Message.show {
    opacity: 1;
}

.hide{
    display:none;
}

@keyframes winnerGlow {
    0% { box-shadow: 0 0 5px #00e5ff, 0 0 10px #00e5ff; }
    50% { box-shadow: 0 0 20px #00e5ff, 0 0 40px #00e5ff; }
    100% { box-shadow: 0 0 5px #00e5ff, 0 0 10px #00e5ff; }
}

.winner-cell {
    animation: winnerGlow 1s infinite;
    background-color: rgba(0, 229, 255, 0.1) ;
}

@media (max-width: 600px) {
    .GameBox {
        height: 90vmin;
        width: 90vmin;
    }
    .cell {
        height: 25vmin;
        width: 25vmin;
        font-size: 10vmin;
    }
}