* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.popup {
    position: absolute;
    top: 20%;
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
    text-align: center;
    z-index: 2;
}

.popup button {
    margin: 10px;
    padding: 12px 24px;
    font-size: 18px;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    background-color: #6c63ff;  /* Violet-blue base color */
    color: white;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.popup button:hover {
    background-color: #574b90;  /* Darker hover effect */
    transform: scale(1.05);
}

/* Icon selection buttons */
.icon-btn.x-btn {
    background-color: #007BFF;  /* Blue for X */
    color: white;
}

.icon-btn.o-btn {
    background-color: #FF3B30;  /* Red for O */
    color: white;
}

.icon-btn.x-btn:hover {
    background-color: #0056b3;  /* Darker blue for hover */
}

.icon-btn.o-btn:hover {
    background-color: #cc2e25;  /* Darker red for hover */
}

/* Hidden class for visibility control */
.hidden {
    display: none;
}

/* Main Game Container */
.game-container {
    text-align: center;
    background-color: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    max-width: 400px;
    width: 100%;
}

/* Board Layout */
.board {
    display: grid;
    grid-template-columns: repeat(3, 100px);
    grid-template-rows: repeat(3, 100px);
    gap: 10px;
    margin: 20px auto;
}

.cell {
    width: 100px;
    height: 100px;
    font-size: 36px;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #eee;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    border: 3px solid #333;
}

.cell.x {
    color: #007BFF; /* Blue for X */
}

.cell.o {
    color: #FF3B30; /* Red for O */
}

/* Status Text */
#status p {
    margin-top: 20px;
    font-size: 18px;
    color: #555;
}

/* Restart Button */
#restartBtn {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 16px;
    background-color: #28a745; /* Green background for restart */
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}

#restartBtn:hover {
    background-color: #218838; /* Darker green on hover */
}

/* Responsive Design for smaller screens */
@media (max-width: 480px) {
    .game-container {
        padding: 20px 30px;
        max-width: 100%;
    }

    .popup {
        top: 10%;
        padding: 20px;
    }

    .choice-btn {
        padding: 8px 16px;
        font-size: 16px;
    }

    .board {
        grid-template-columns: repeat(3, 90px);
        grid-template-rows: repeat(3, 90px);
    }

    .cell {
        font-size: 32px;
        width: 90px;
        height: 90px;
    }
}