body {
    margin: 0;
    min-height: 100vh;
    background: radial-gradient(circle at top, #3007e8, #0f0c29);
    display: flex;
    justify-content: center;
}


.game-container {
    text-align: center;
    margin: 2rem auto;
    max-width: 400px;
}

/* Scoreboard */
.scoreboard {
    display: flex;
    justify-content: space-around;
    margin-bottom: 1rem;
    font-size: 1.2rem;
    color: #5cffd4;
    text-shadow: 0 0 5px rgba(122, 92, 255, 0.7), 0 0 10px rgba(122, 92, 255, 0.6);
}

/* Board */
.board {
    display: grid;
    grid-template-columns: repeat(3, 100px);
    grid-gap: 15px;
    justify-content: center;
    margin: 1rem 0 2rem;
}

.cell {
    width: 100px;
    height: 100px;
    background: #1b262f;
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.5rem;
    color: #01f2fa;
    cursor: pointer;
    transition: transform 0.2s ease;
    text-shadow: 0 0 5px rgba(0,198,255,0.7);
}

.cell:hover {
    transform: translateY(-5px);
    animation: glowing 1.6s infinite alternate;
}

.cell.taken {
    cursor: not-allowed;
}

/* Neon animation for symbols */
.cell.x {
    color: #ff007f;
    text-shadow: 0 0 5px #ff007f, 0 0 10px #ff007f, 0 0 20px #ff007f;
    animation: glowingX 1.6s infinite alternate;
}

.cell.o {
    color: #00fff2;
    text-shadow: 0 0 5px #00fff2, 0 0 10px #00fff2, 0 0 20px #00fff2;
    animation: glowingO 1.6s infinite alternate;
}

/* Neon animation keyframes */
@keyframes glowing {
    from { box-shadow: 0 0 5px rgba(170,0,255,0.6), 0 0 15px rgba(170,0,255,0.7); }
    to { box-shadow: 0 0 20px rgba(0,198,255,0.7), 0 0 40px rgba(0,198,255,0.9); }
}

@keyframes glowingX {
    from { text-shadow: 0 0 5px #ff007f, 0 0 10px #ff007f; }
    to { text-shadow: 0 0 15px #ff007f, 0 0 25px #ff007f; }
}

@keyframes glowingO {
    from { text-shadow: 0 0 5px #00fff2, 0 0 10px #00fff2; }
    to { text-shadow: 0 0 15px #00fff2, 0 0 25px #00fff2; }
}

/* Buttons */
#restart, .back-link {
    display: block;
    width: max-content;
    padding: 0.6rem 1.2rem;
    background: linear-gradient(45deg, #7a5cff, #00c6ff);
    color: #000;
    font-weight: 600;
    border-radius: 6px;
    text-decoration: none;
    margin: 1rem auto;
    transition: transform 0.3s ease;
    cursor: pointer;
}

#restart:hover, .back-link:hover {
    transform: scale(1.05);
    animation: glowing 1.6s infinite alternate;
}