body {
    background: linear-gradient(135deg, #e0f2fe 0%, #f8fafc 100%);
    overflow-x: hidden;
}

.fade-in {
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Estilos específicos para las cartas del memorama */
.card-ft {
    width: 100%;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    background-color: #bae6fd; /* Azul pastel cerrado */
    border-radius: 0.75rem;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.3s;
    user-select: none;
}

.card-ft.flipped {
    background-color: white;
    border: 2px solid #7dd3fc;
}