/* Utility Classes */

/* Page turn animation when switching modes */
.mode-container.active {
    animation: pageTurn 0.7s ease-in-out;
}

@keyframes pageTurn {
    0% {
        opacity: 0;
        transform: rotateY(-30deg) translateX(-30px);
    }

    100% {
        opacity: 1;
        transform: rotateY(0) translateX(0);
    }
}

/* Enhanced utility classes for themes */
.fade-in {
    animation: fadeIn var(--transition-standard);
}

/* Prevent text selection during touch interactions */
.no-select {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* Empty state styling */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 1rem;
    text-align: center;
    background-color: var(--parchment);
    background-image: var(--parchment-texture);
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    height: 350px;
    width: 100%;
    max-width: 650px;
    margin: 0 auto; /* Center horizontally */
    border: var(--border-style);
    position: relative;
}

.empty-state p {
    margin-bottom: 1.5rem;
    color: var(--ink-faded);
    font-style: italic;
    font-size: 1.1rem;
    max-width: 80%;
}

.empty-state button {
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
}

/* Ensure the flashcard mode container properly centers content */
#flashcard-mode.mode-container.active {
    display: flex;
    flex-direction: column;
    align-items: center;
}