body {
    font-family: 'Orbitron', sans-serif;
    background-color: #1a1a1a;
    color: #00ff00;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    text-align: center;
    border: 2px solid #00ff00;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 0 20px #00ff00;
}

.tic-tac-toe {
    margin-top: 20px;
}

.scoreboard {
    display: flex;
    justify-content: space-around;
    margin-bottom: 20px;
    font-size: 1.5em;
}

.board {
    display: grid;
    grid-template-columns: repeat(3, 100px);
    grid-gap: 10px;
    justify-content: center;
}

.cell {
    width: 100px;
    height: 100px;
    background-color: #333;
    border: 2px solid #00ff00;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 4em;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.cell:hover {
    background-color: #444;
    box-shadow: 0 0 10px #00ff00;
}

.cell.x::before {
    content: 'X';
    color: #ff00ff;
    text-shadow: 0 0 10px #ff00ff;
}

.cell.o::before {
    content: 'O';
    color: #00ffff;
    text-shadow: 0 0 10px #00ffff;
}

.winning-message {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.9);
    font-size: 5rem;
    color: #00ff00;
}

.winning-message.show {
    display: flex;
}

#restartButton {
    font-family: 'Orbitron', sans-serif;
    font-size: 2rem;
    padding: 10px 20px;
    margin-top: 20px;
    cursor: pointer;
    background-color: #1a1a1a;
    color: #00ff00;
    border: 2px solid #00ff00;
    border-radius: 10px;
    transition: background-color 0.3s, box-shadow 0.3s;
}

#restartButton:hover {
    background-color: #333;
    box-shadow: 0 0 15px #00ff00;
}