* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1e3a8a 0%, #0f172a 100%);
    color: #f8fafc;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    backdrop-filter: blur(10px);
}

h1 {
    font-size: 2.5rem;
    color: #fbbf24;
    margin-bottom: 10px;
}

.subtitle {
    color: #94a3b8;
    font-size: 1rem;
}

.game-controls {
    background: rgba(15, 23, 42, 0.8);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 25px;
    border: 1px solid #334155;
}

.game-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.turn {
    padding: 12px 25px;
    border-radius: 8px;
    font-weight: bold;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.turn::before {
    content: '';
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: inline-block;
}

.white-turn {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid #f8fafc;
}

.white-turn::before {
    background: #f8fafc;
}

.black-turn {
    background: rgba(0, 0, 0, 0.3);
    border: 2px solid #475569;
}

.black-turn::before {
    background: #0f172a;
}

.status {
    font-size: 1.3rem;
    color: #4ade80;
    font-weight: bold;
}

.buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.btn-primary {
    background: #3b82f6;
    color: white;
}

.btn-secondary {
    background: #94a3b8;
    color: white;
}

.btn-danger {
    background: #ef4444;
    color: white;
}

.btn-sound {
    background: #8b5cf6;
    color: white;
}

.btn-install {
    background: #10b981;
    color: white;
}

.btn-cancel {
    background: #64748b;
    color: white;
}

.btn-small {
    padding: 8px 16px;
    font-size: 0.9rem;
}

.chess-board {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    grid-template-rows: repeat(8, 1fr);
    width: 100%;
    max-width: 600px;
    aspect-ratio: 1 / 1;
    margin: 0 auto 30px;
    border: 3px solid #475569;
    border-radius: 5px;
    overflow: hidden;
}

.square {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    cursor: pointer;
    user-select: none;
    transition: all 0.2s ease;
}

.square:hover {
    filter: brightness(1.2);
}

.light {
    background: #f0d9b5;
}

.dark {
    background: #b58863;
}

.selected {
    background: rgba(59, 130, 246, 0.5) !important;
}

.possible-move {
    position: relative;
}

.possible-move::after {
    content: '';
    position: absolute;
    width: 30%;
    height: 30%;
    background: rgba(34, 197, 94, 0.6);
    border-radius: 50%;
}

.piece {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.8rem;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
}

.white-piece {
    color: #f8fafc;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.black-piece {
    color: #0f172a;
    text-shadow: 1px 1px 2px rgba(255, 255, 255, 0.3);
}

.captured {
    opacity: 0.7;
    transform: scale(0.8);
}

.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 25px;
    background: rgba(15, 23, 42, 0.8);
    padding: 20px;
    border-radius: 12px;
}

.stat {
    background: rgba(255, 255, 255, 0.05);
    padding: 15px;
    border-radius: 8px;
    text-align: center;
}

.stat-label {
    display: block;
    color: #94a3b8;
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: bold;
    color: #fbbf24;
}

.instructions {
    background: rgba(255, 255, 255, 0.05);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 25px;
}

.instructions h3 {
    color: #fbbf24;
    margin-bottom: 10px;
}

.instructions ul {
    padding-left: 20px;
    color: #cbd5e1;
}

.instructions li {
    margin-bottom: 8px;
    line-height: 1.5;
}

.pwa-install {
    background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 25px;
    text-align: center;
    border: 2px solid #3b82f6;
}

.pwa-install p {
    margin-bottom: 15px;
    font-size: 1.1rem;
    color: #fbbf24;
}

footer {
    text-align: center;
    padding: 20px;
    color: #94a3b8;
    border-top: 1px solid #334155;
    margin-top: 20px;
}

footer p {
    margin-bottom: 15px;
}

/* मोबाइल रेस्पॉन्सिव */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }
    
    .chess-board {
        max-width: 95vw;
    }
    
    .piece {
        font-size: 2.2rem;
    }
    
    .buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .game-info {
        flex-direction: column;
        text-align: center;
    }
    
    .stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .piece {
        font-size: 1.8rem;
    }
    
    .stats {
        grid-template-columns: 1fr;
    }
    
    .turn {
        font-size: 1rem;
        padding: 10px 20px;
    }
      }