h2 {
            color: #3d5a80;
            text-align: center;
            font-size: 2.5rem;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
            margin-bottom: 30px;
        }

        .game-container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 15px;
            max-width: 500px;
            margin: 0 auto;
            padding: 20px;
            background: rgba(255, 255, 255, 0.9);
            border-radius: 20px;
            box-shadow: 0 8px 32px rgba(0,0,0,0.1);
        }

        .card {
            aspect-ratio: 1;
            background: #fff;
            border-radius: 15px;
            cursor: pointer;
            position: relative;
            transform-style: preserve-3d;
            transition: transform 0.6s;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }

        .card:hover {
            transform: scale(1.05);
        }

        .card.flipped {
            transform: rotateY(180deg);
        }

        .card.matched {
            animation: celebration 0.5s ease infinite;
        }

        .card-face {
            position: absolute;
            width: 100%;
            height: 100%;
            backface-visibility: hidden;
            border-radius: 15px;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .card-front {
            background: #3d5a80;
            background-image: linear-gradient(45deg, #3d5a80 25%, #2b4057 25%, #2b4057 50%, #3d5a80 50%, #3d5a80 75%, #2b4057 75%, #2b4057 100%);
            background-size: 56.57px 56.57px;
            font-size: 2em;
            color: white;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
        }

        .card-back {
            transform: rotateY(180deg);
            background: #fff;
            font-size: 2.5em;
            font-weight: bold;
            color: #2b4057;
        }

        @keyframes celebration {
            0%, 100% { transform: rotateY(180deg) scale(1); }
            50% { transform: rotateY(180deg) scale(1.1); }
        }

        .button-85 {
            padding: 15px 30px;
            font-size: 1.2rem;
            font-family: 'Comic Sans MS', cursive, sans-serif;
            margin-top: 30px;
            background: #3d5a80;
            border: none;
            border-radius: 25px;
            color: white;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(0,0,0,0.2);
        }

        .button-85:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(0,0,0,0.25);
        }

        @media (max-width: 768px) {
            .game-container {
                gap: 10px;
                padding: 15px;
            }

            h2 {
                font-size: 1.8rem;
            }
        }

        @media (max-width: 480px) {
            .game-container {
                gap: 8px;
                padding: 10px;
            }

            h2 {
                font-size: 1.5rem;
            }

            .button-85 {
                padding: 12px 24px;
                font-size: 1rem;
            }

            .card-front {
                font-size: 1.5em;
            }

            .card-back {
                font-size: 2em;
            }
        }