body {
    background: #111;
    color: #fff;
    font-family: Arial, sans-serif;
    text-align: center;
    padding: 30px;
}

h1 {
    font-size: 3rem;
    margin-bottom: 10px;
}

.subtitle {
    opacity: 0.7;
    margin-bottom: 30px;
}

#game {
    width: 600px;
    max-width: 90%;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.tile {
    background: #1a1a1a;
    border: 2px solid #333;
    border-radius: 10px;
    height: 120px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    transition: transform 0.2s ease, background 0.2s ease;
}

.tile.flipped {
    background: #4CAF50;
    transform: scale(1.05);
}

.tile.matched {
    background: #2196F3;
    cursor: default;
}

#win-screen {
    margin-top: 40px;
}

.hidden {
    display: none;
}

button {
    padding: 12px 25px;
    font-size: 1.2rem;
    border: none;
    border-radius: 10px;
    background: #4CAF50;
    color: white;
    cursor: pointer;
    margin-top: 20px;
}

button:hover {
    background: #45a049;
}