:root {
    --board-color: #2e8b57;
    --board-border: #1a5233;
    --cell-size: 50px;
    --piece-size: 40px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: #f0f2f5;
}

.container {
    text-align: center;
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

h1 {
    margin-top: 0;
    color: #333;
}

.controls {
    margin-bottom: 1.5rem;
    display: flex;
    justify-content: center;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.control-group {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

label {
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
    color: #666;
}

select, button {
    padding: 0.5rem;
    border-radius: 4px;
    border: 1px solid #ddd;
    font-size: 1rem;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    cursor: pointer;
    margin-top: 1.2rem; /* Align with inputs */
    transition: background-color 0.2s;
}

button:hover {
    background-color: #0056b3;
}

.game-info {
    margin-bottom: 1rem;
    display: flex;
    justify-content: space-around;
    align-items: center;
    width: 100%;
}

.score-board {
    display: flex;
    gap: 2rem;
}

.score-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: bold;
    font-size: 1.2rem;
}

.piece {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: inline-block;
    border: 1px solid #ccc;
}

.black-piece { background-color: black; }
.white-piece { background-color: white; }

.turn-indicator {
    font-weight: bold;
    font-size: 1.2rem;
}

#message-area {
    height: 1.5rem;
    color: #d9534f;
    font-weight: bold;
}

.board {
    display: grid;
    grid-template-columns: repeat(8, var(--cell-size));
    grid-template-rows: repeat(8, var(--cell-size));
    background-color: var(--board-color);
    border: 5px solid var(--board-border);
    margin: 0 auto;
    width: fit-content;
}

.cell {
    width: var(--cell-size);
    height: var(--cell-size);
    border: 1px solid var(--board-border);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    position: relative;
}

.cell.valid-move::after {
    content: '';
    width: 10px;
    height: 10px;
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: 50%;
}

.game-piece {
    width: var(--piece-size);
    height: var(--piece-size);
    border-radius: 50%;
    transition: transform 0.3s ease, background-color 0.3s ease;
    box-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.game-piece.black { background-color: black; }
.game-piece.white { background-color: white; }