body {
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    text-align: center;
    background: rgba(0, 0, 0, 0.6);
    padding: 20px;
    border-radius: 20px;
    width: 350px;
}

h1 {
    margin-bottom: 15px;
}

.mode-select button,
#resetBtn {
    padding: 10px 20px;
    margin: 5px;
    border: none;
    border-radius: 10px;
    background: #ff9800;
    color: white;
    cursor: pointer;
    font-size: 16px;
    transition: 0.3s;
}

.mode-select button:hover,
#resetBtn:hover {
    background: #e68900;
}

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

.cell {
    background: white;
    color: black;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 36px;
    font-weight: bold;
    cursor: pointer;
    border-radius: 10px;
    transition: background 0.3s;
}

.cell:hover {
    background: #ddd;
}

.winner {
    background: #4caf50 !important;
    color: white;
}

.status {
    margin: 15px 0;
    font-size: 18px;
    font-weight: bold;
}

.scoreboard {
    margin: 15px 0;
    font-size: 16px;
}