body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f4f4f9;
}

.container {
    text-align: center;
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

.controls {
    margin-bottom: 20px;
}

.btn {
    padding: 10px 20px;
    margin: 0 5px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    background-color: #ddd;
    transition: background-color 0.2s;
}

.btn.active {
    background-color: #007bff;
    color: white;
}

.btn:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

.status {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 20px;
    min-height: 24px;
    color: #333;
}

.board {
    display: grid;
    grid-template-columns: repeat(3, 100px);
    grid-gap: 5px;
    margin: 0 auto 20px auto;
    width: 310px;
    background-color: #333;
    border: 5px solid #333;
    border-radius: 10px;
}

.cell {
    width: 100px;
    height: 100px;
    background-color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 48px;
    font-weight: bold;
    cursor: pointer;
}

.cell.x { color: #dc3545; }
.cell.o { color: #007bff; }