body {
            box-sizing: border-box;
        }
        
        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        @keyframes slideIn {
            from { opacity: 0; transform: translateX(-30px); }
            to { opacity: 1; transform: translateX(0); }
        }
        
        @keyframes bounce {
            0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
            40% { transform: translateY(-10px); }
            60% { transform: translateY(-5px); }
        }
        
        @keyframes chessPieceMove {
            0% { transform: translate(0, 0); }
            50% { transform: translate(10px, -10px); }
            100% { transform: translate(0, 0); }
        }
        
        .animate-fadeInUp { animation: fadeInUp 0.8s ease-out; }
        .animate-slideIn { animation: slideIn 0.8s ease-out; }
        .animate-bounce-custom { animation: bounce 2s infinite; }
        .animate-chess-piece { animation: chessPieceMove 3s ease-in-out infinite; }
        
        .chessboard-bg {
            background-image: 
                linear-gradient(45deg, #f0d9b5 25%, transparent 25%), 
                linear-gradient(-45deg, #f0d9b5 25%, transparent 25%), 
                linear-gradient(45deg, transparent 75%, #f0d9b5 75%), 
                linear-gradient(-45deg, transparent 75%, #f0d9b5 75%);
            background-size: 60px 60px;
            background-position: 0 0, 0 30px, 30px -30px, -30px 0px;
        }
        
        .chess-piece {
            font-size: 2rem;
            display: inline-block;
        }
        
        .modal {
            display: none;
            position: fixed;
            z-index: 1000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0,0,0,0.5);
        }
        
        .modal.show {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .card-hover {
            transition: all 0.3s ease;
        }
        
        .card-hover:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
        }
        
        .nav-link {
            position: relative;
            transition: color 0.3s ease;
        }
        
        .nav-link::after {
            content: '';
            position: absolute;
            width: 0;
            height: 2px;
            bottom: -5px;
            left: 0;
            background-color: #d4af37;
            transition: width 0.3s ease;
        }
        
        .nav-link:hover::after {
            width: 100%;
        }
        
        .page {
            display: none;
        }
        
        .page.active {
            display: block;
        }
        
        .stats-counter {
            font-size: 2.5rem;
            font-weight: bold;
            color: #d4af37;
        }