:root {
    --bg-dark: #0f172a;
    --panel-bg: rgba(30, 41, 59, 0.7);
    --primary: #3b82f6;
    --glass-border: rgba(255, 255, 255, 0.1);
    
    --p1-color: #333333; /* Black */
    --p2-color: #ef4444; /* Red */
    --board-light: #fef08a; /* Wood light */
    --board-dark: #854d0e;  /* Wood dark */
    
    --cell-size: 45px;
}

body {
    background-color: var(--bg-dark);
    color: white;
    font-family: 'Outfit', sans-serif;
    margin: 0;
    overflow-x: hidden;
}

.game-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 2rem 1rem;
    position: relative;
    z-index: 10;
    text-align: center;
}

.game-header h1 {
    font-size: 2.5rem;
    margin: 1rem 0 0 0;
}

.score-board {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 1.5rem 0;
}

.player-score {
    background: var(--panel-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 0.75rem 1.5rem;
    min-width: 120px;
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
    align-items: center;
    opacity: 0.5;
}

.player-score.active {
    opacity: 1;
    transform: scale(1.05);
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.1);
}

.player-score.player1.active {
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.5);
    border-color: var(--p1-color);
}
.player-score.player2.active {
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.5);
    border-color: var(--p2-color);
}

.player-score .name {
    font-size: 0.85rem;
    color: #94a3b8;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.25rem;
}

.player-score .score {
    font-size: 1.8rem;
    font-weight: 700;
}

#status-message {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: #cbd5e1;
    height: 1.5rem;
}

.panel {
    background: var(--panel-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    max-width: 400px;
    margin: 0 auto;
}

.btn-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.checkerboard {
    display: grid;
    margin: 0 auto;
    border: 4px solid var(--board-dark);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    width: fit-content;
    border-radius: 4px;
}

.cell {
    width: var(--cell-size);
    height: var(--cell-size);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    box-sizing: border-box;
}

.cell.light {
    background-color: var(--board-light);
}

.cell.dark {
    background-color: var(--board-dark);
}

.cell.dark.valid-move {
    box-shadow: inset 0 0 0 4px rgba(59, 130, 246, 0.8);
    cursor: pointer;
}

.piece {
    width: 80%;
    height: 80%;
    border-radius: 50%;
    box-shadow: 0 4px 6px rgba(0,0,0,0.5), inset 0 2px 5px rgba(255,255,255,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s, box-shadow 0.2s;
    user-select: none;
}

.piece.p1 {
    background: radial-gradient(circle at 30% 30%, #4a4a4a, #1a1a1a);
    border: 2px solid #000;
}

.piece.p2 {
    background: radial-gradient(circle at 30% 30%, #f87171, #b91c1c);
    border: 2px solid #7f1d1d;
}

.piece.selected {
    transform: scale(1.1);
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.8);
    border: 2px solid #fff;
}

.piece.king::after {
    content: "👑";
    font-size: 1.2rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

.hidden {
    display: none !important;
}

@media (max-width: 450px) {
    :root {
        --cell-size: 11.5vw;
    }
    .score-board {
        gap: 0.5rem;
    }
    .player-score {
        min-width: 100px;
        padding: 0.5rem 1rem;
    }
}