body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    margin: 0;
    padding: 20px;
}

h1 {
    margin: 20px;
}

#gameBoard {
    display: grid;
    grid-template-columns: repeat(7, 100px);
    gap: 5px;
    margin-bottom: 20px;
}

.cell {
    width: 100px;
    height: 100px;
    background: rgba(255, 255, 255, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.18);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    border-radius: 50%;
    cursor: pointer;
}

.cell.empty:hover {
    background: rgba(255, 255, 255, 0.4);
}

.cell.X {
    background: rgba(255, 0, 0, 0.5);
}

.cell.O {
    background: rgba(255, 255, 0, 0.5);
}

.cell.winning {
    animation: highlight 1s infinite;
}

@keyframes highlight {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
    }
}

#resetButton {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    background: rgba(0, 123, 255, 0.5);
    color: white;
    border: none;
    border-radius: 5px;
}

#resetButton:hover {
    background: rgba(0, 123, 255, 0.7);
}