style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
}

body {
    min-height: 100vh;
    background: linear-gradient(135deg, #1e3c72, #2a5298);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
}

h1 {
    font-size: 3rem;
    margin-bottom: 2rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.board {
    display: grid;
    grid-template-columns: repeat(3, 100px);
    gap: 10px;
    background: rgba(255,255,255,0.1);
    padding: 20px;
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}

.cell {
    width: 100px;
    height: 100px;
    background: rgba(255,255,255,0.1);
    border: none;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.cell:hover {
    background: rgba(255,255,255,0.2);
    transform: scale(1.05);
}

.status {
    text-align: center;
    font-size: 1.5rem;
    margin: 2rem 0;
    padding: 1rem;
    background: rgba(255,255,255,0.1);
    border-radius: 10px;
    width: 80%;
    max-width: 400px;
}

.restart {
    background: #4CAF50;
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.restart:hover {
    background: #45a049;
    transform: translateY(-2px);
}

@media (max-width: 480px) {
    .board {
        grid-template-columns: repeat(3, 80px);
        gap: 8px;
    }
    
    .cell {
        width: 80px;
        height: 80px;
        font-size: 36px;
    }
    
    h1 {
        font-size: 2rem;
    }
}