/* --- Flashcard Mode Specific Styles --- */

.perspective-container {
    perspective: 1500px;
    /* height is set via tailwind utility in html (h-96) */
}

.flashcard {
    transform-style: preserve-3d;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.2s ease-in-out;
    box-shadow: var(--shadow-lg);
    border-radius: var(--border-radius-card);
}

@media (pointer: coarse) {
    .flashcard {
        touch-action: none; /* Prevent scrolling on swipe (mobile only) */
    }
}

/* This class disables the flip animation temporarily */
.flashcard.no-flip-animation {
    transition: opacity 0.2s ease-in-out;
}

.flashcard.is-flipped {
    transform: rotateX(180deg);
}

.card-face {
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    background-color: var(--color-card-bg);
    border-radius: var(--border-radius-card);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 2.5rem;
    border: 1px solid var(--color-border);
    overflow-wrap: break-word;
    word-break: break-word;
    text-align: center;
    /* Compositing fix */
    transform: translateZ(0);
}

.card-face.image-only {
    gap: 0;
    justify-content: center;
}

.card-face.image-only .flashcard-media-slot {
    max-height: 70%;
}

#flashcard-front p {
    font-size: 2.5rem;
    font-weight: 800;
}

#flashcard-back p {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--color-text-secondary);
}

.flashcard-media-slot {
    width: 100%;
    max-height: 50%;
    display: none;
    align-items: center;
    justify-content: center;
}

.flashcard-media-slot img {
    max-height: 100%;
    width: 100%;
    object-fit: contain;
    border-radius: 0.5rem;
}

#share-images-modal-overlay,
#missing-images-modal-overlay,
#quizlet-import-details-modal-overlay {
    z-index: 3000;
}

#quizlet-import-details-modal-content {
    text-align: center;
}

#quizlet-import-details-body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    text-align: center;
    margin-bottom: 20px;
}

.quizlet-import-modal-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-text-primary);
    line-height: 1.3;
    margin: 0;
}

.quizlet-import-modal-line {
    margin: 0;
    font-size: 0.95rem;
    color: var(--color-text-secondary);
}

#quizlet-import-details-modal-ack {
    margin: 0 auto;
    display: block;
}

.card-back {
    /* Combine rotation with translateZ for stabilization */
    transform: rotateX(180deg) translateZ(0);
}

/* --- Settings Language Select Dropdowns --- */
.settings-select {
    background-color: var(--color-card-bg);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-button);
    padding: 0.65rem 2.5rem 0.65rem 0.75rem;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
}
.settings-select:hover {
    border-color: var(--color-text-secondary);
}
.settings-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px var(--color-primary-light);
}

/* --- TTS Button --- */
.tts-button {
    position: absolute;
    top: 1.5rem;
    left: 1.5rem;
    z-index: 10;
    padding: 0.5rem;
    border-radius: 9999px;
    background-color: rgba(0,0,0,0.1);
    color: var(--color-text-secondary);
    transition: all 0.2s ease;
}
.tts-button:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary);
}
body.light-mode .tts-button:hover {
    color: var(--color-primary);
}
.tts-button:active {
    transform: scale(0.95);
}

/* --- Navigation Controls --- */
#flashcard-nav {
    margin-top: 2rem;
    align-items: center;
}

#flashcard-nav button {
    background-color: var(--color-card-bg);
    color: var(--color-text-primary);
    font-weight: 700;
    font-size: 1.25rem;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

#flashcard-nav button:hover {
    background-color: var(--color-primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--color-primary);
}

body.light-mode #flashcard-nav button:hover {
    border-color: transparent;
}

#card-counter {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-text-secondary);
}

/* --- Slide Animations --- */
@keyframes slide-out-left {
    from { transform: translateX(0); opacity: 1; }
    to { transform: translateX(-100%); opacity: 0; }
}
@keyframes slide-in-right {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}
@keyframes slide-out-right {
    from { transform: translateX(0); opacity: 1; }
    to { transform: translateX(100%); opacity: 0; }
}
@keyframes slide-in-left {
    from { transform: translateX(-100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

.slide-out-left { animation: slide-out-left 0.1s ease-out forwards; }
.slide-in-right { animation: slide-in-right 0.1s ease-out forwards; }
.slide-out-right { animation: slide-out-right 0.1s ease-out forwards; }
.slide-in-left { animation: slide-in-left 0.1s ease-out forwards; }