body {
    background-color: #222;
    color: #eee;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    text-align: center;
}

h1 {
    color: #ffcc00;
    text-shadow: 2px 2px 4px #000000;
}

#board {
    margin: 20px auto;
    border: 5px solid #444;
}

.controls {
    margin-top: 20px;
}

button {
    background-color: #444;
    color: white;
    border: 1px solid #666;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
    margin: 0 5px;
    transition: background 0.3s;
}

button:hover {
    background-color: #666;
}

#status {
    margin-bottom: 10px;
    font-size: 1.2em;
    font-weight: bold;
}

#fen {
    margin-top: 10px;
    font-family: monospace;
    font-size: 0.8em;
    color: #888;
}

/* Modal Styling */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.8);
}

.modal-content {
    background-color: #333;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 300px;
    text-align: center;
    border-radius: 8px;
}

.promotion-pieces img {
    width: 60px;
    height: 60px;
    cursor: pointer;
    margin: 5px;
    transition: transform 0.2s;
}

.promotion-pieces img:hover {
    transform: scale(1.1);
    background-color: #444;
    border-radius: 5px;
}