/* Flashcard Styles */
.flashcard-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    position: relative;
}

.flashcard {
    perspective: 1500px;
    width: 100%;
    max-width: 650px;
    height: 350px;
    transition: transform var(--transition-standard);
    position: relative;
    touch-action: pan-y;
    -webkit-tap-highlight-color: transparent;
}

.flashcard-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform var(--transition-slow);
    transform-style: preserve-3d;
    cursor: pointer;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    will-change: transform;
}

.flashcard:hover .flashcard-inner {
    box-shadow: var(--card-shadow-raised);
}

.flashcard.flipped .flashcard-inner {
    transform: rotateY(180deg);
}

.flashcard-front,
.flashcard-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    padding: 2.5rem;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.flashcard-front::before,
.flashcard-back::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: var(--parchment-texture), var(--ink-splatter);
    background-position: center;
    opacity: 1;
    z-index: -1;
}

.flashcard-front {
    background-color: var(--parchment);
    border: var(--border-style);
}

.flashcard-back {
    background-color: var(--parchment-dark);
    transform: rotateY(180deg);
    border: var(--border-style);
}

/* When card is flipped, update aria-hidden values */
.flashcard.flipped .flashcard-front {
    aria-hidden: true;
}

.flashcard.flipped .flashcard-back {
    aria-hidden: false;
}

.flashcard h3 {
    margin-bottom: 1.5rem;
    color: var(--ink);
    font-size: 1.3rem;
    font-weight: 700;
    font-family: var(--font-serif);
    text-align: center;
    position: relative;
    padding-bottom: 0.75rem;
}

.flashcard h3::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 30%;
    right: 30%;
    height: 1px;
    background-color: var(--ink-light);
    opacity: 0.3;
}

.flashcard p {
    flex-grow: 1;
    overflow-y: auto;
    white-space: pre-line;
    padding-right: 10px;
    line-height: 1.7;
    font-size: 1.05rem;
    color: var(--ink);
}

/* Swiping hint indicators */
.flashcard::before,
.flashcard::after {
    content: "";
    position: absolute;
    top: 50%;
    height: 50px;
    width: 50px;
    background-color: var(--swipe-hint);
    border-radius: 50%;
    transform: translateY(-50%) scale(0);
    opacity: 0;
    transition: transform var(--transition-standard), opacity var(--transition-standard);
    z-index: 10;
    pointer-events: none;
}

.flashcard::before {
    left: -15px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' width='24' height='24' stroke='%23f9f5ed' fill='none' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='15 18 9 12 15 6'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
}

.flashcard::after {
    right: -15px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' width='24' height='24' stroke='%23f9f5ed' fill='none' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='9 18 15 12 9 6'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
}

/* Help hint for double-tap */
.help-hint {
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%) translateY(-100%);
    background-color: var(--ink);
    color: var(--parchment-light);
    padding: 0.7rem 1.2rem;
    border-radius: 20px;
    font-size: 0.9rem;
    opacity: 0;
    transition: transform var(--transition-standard), opacity var(--transition-standard);
    z-index: 100;
    pointer-events: none;
    text-align: center;
    white-space: nowrap;
}

.help-hint.visible {
    transform: translateX(-50%) translateY(0);
    opacity: 0.9;
}

/* Scrollbar for flashcards */
.flashcard p::-webkit-scrollbar {
    width: 6px;
}

.flashcard p::-webkit-scrollbar-track {
    background: rgba(42, 37, 34, 0.05);
    border-radius: 10px;
}

.flashcard p::-webkit-scrollbar-thumb {
    background: rgba(42, 37, 34, 0.2);
    border-radius: 10px;
}

.flashcard-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 650px;
    margin-top: 1rem;
}

#card-progress {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--ink-faded);
}