#board {
    display: grid;
    grid-template-columns: repeat(8, 60px);
    grid-template-rows: repeat(8, 60px);
    width: 480px;
    border: 2px solid #222;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.6);
    background-color: #111;
    margin: auto;
}

.square {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Segoe UI', sans-serif;
    transition: background-color 0.2s ease;
}

.white {
    background-color: #2e2e2e;
}

.black {
    background-color: #1a1a1a;
}

.square:hover {
    background-color: #444;
    cursor: pointer;
}

.square img {
    width: 50px;
    height: 50px;
    filter: drop-shadow(0 0 4px rgba(255, 255, 255, 0.15));
    pointer-events: none;
    user-select: none;
}

body {
    background: linear-gradient(135deg, #0e1f0e, #1e402e, #2f5e3e);
    background-attachment: fixed;
    color: white;
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    text-align: center;
}