body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.container {
    background-color: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    text-align: center;
}

h1 {
    color: #333;
}

.input-container {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

input {
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

button {
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
    margin: 10px 5px;
    display: inline-block;
}

button:hover {
    background-color: #45a049;
}

.game-board {
    display: grid;
    grid-template-columns: repeat(3, 100px);
    grid-gap: 5px;
    margin: 20px auto;
}

.cell {
    width: 100px;
    height: 100px;
    background-color: #f0f0f0;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 48px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.cell:hover {
    background-color: #e0e0e0;
}

.x {
    color: #ff4136;
}

.o {
    color: #0074d9;
}

.hidden {
    display: none;
}

.player-turn {
    margin-bottom: 10px;
    font-weight: bold;
}

.game-over {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 20px;
}

.button-container {
    display: flex;
    justify-content: center;
    align-items: center;
}