/* ============================================
   FLASHCARD STYLES
   ============================================ */

/* Flashcard Button in Header */
.flashcard-toggle-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 25px;
    background: var(--badge-bg);
    color: var(--badge-text);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.flashcard-toggle-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.flashcard-icon {
    font-size: 16px;
}

/* Flashcard Container */
.flashcard-container {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    z-index: 10000;
    padding: 20px;
    overflow-y: auto;
}

.flashcard-container.active {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* Flashcard Modal */
.flashcard-modal {
    background: var(--card-bg);
    border-radius: 20px;
    max-width: 800px;
    width: 100%;
    padding: 30px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    position: relative;
}

/* Close Button */
.flashcard-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 32px;
    color: var(--card-text);
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.3s ease;
    padding: 5px 10px;
    line-height: 1;
}

.flashcard-close:hover {
    opacity: 1;
}

/* Flashcard Header */
.flashcard-header {
    text-align: center;
    margin-bottom: 25px;
}

.flashcard-title {
    color: var(--header-color);
    font-size: 1.8em;
    margin-bottom: 10px;
}

.flashcard-category {
    display: inline-block;
    padding: 6px 16px;
    background: var(--section-bg);
    color: var(--section-text);
    border-radius: 20px;
    font-size: 0.9em;
    font-weight: 600;
    margin-bottom: 10px;
}

.flashcard-progress {
    color: var(--card-text);
    font-size: 0.95em;
    opacity: 0.8;
    margin-top: 5px;
}

/* Flashcard Display Area */
.flashcard-display {
    perspective: 1000px;
    margin: 25px 0;
    min-height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.flashcard {
    position: relative;
    width: 100%;
    min-height: 250px;
    transform-style: preserve-3d;
    transition: transform 0.6s ease;
    cursor: pointer;
}

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

.flashcard-face {
    position: absolute;
    width: 100%;
    min-height: 250px;
    backface-visibility: hidden;
    border-radius: 12px;
    padding: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--card-bg);
    border: 2px solid var(--section-bg);
    transition: border-color 0.3s ease;
}

.flashcard:hover .flashcard-face {
    border-color: var(--badge-bg);
}

.flashcard-front {
    background: var(--card-bg);
}

.flashcard-back {
    background: var(--card-bg);
    transform: rotateY(180deg);
}

.flashcard-label {
    display: inline-block;
    padding: 6px 16px;
    background: var(--section-bg);
    color: var(--section-text);
    border-radius: 20px;
    font-size: 0.85em;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 20px;
}

.flashcard-content {
    font-size: 1.2em;
    color: var(--card-text);
    text-align: center;
    line-height: 1.6;
}

.flashcard-hint {
    margin-top: 20px;
    font-size: 0.85em;
    color: var(--card-text);
    opacity: 0.6;
}

/* Flashcard Controls */
.flashcard-controls {
    display: flex;
    gap: 15px;
    justify-content: center;
    align-items: center;
    margin-top: 25px;
    flex-wrap: wrap;
}

.flashcard-btn {
    padding: 12px 24px;
    border: none;
    border-radius: 25px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.flashcard-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.flashcard-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.flashcard-btn-primary {
    background: var(--badge-bg);
    color: var(--badge-text);
}

.flashcard-btn-secondary {
    background: var(--section-bg);
    color: var(--section-text);
}

.flashcard-btn-nav {
    background: var(--section-bg);
    color: var(--section-text);
    border: none;
    padding: 10px 20px;
}

/* Flashcard Options */
.flashcard-options {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
    flex-wrap: wrap;
}

.flashcard-option-btn {
    padding: 8px 16px;
    border: 2px solid var(--section-bg);
    border-radius: 20px;
    background: transparent;
    color: var(--card-text);
    font-size: 0.9em;
    cursor: pointer;
    transition: all 0.3s ease;
}

.flashcard-option-btn:hover {
    background: var(--section-bg);
    color: var(--section-text);
}

.flashcard-option-btn.active {
    background: var(--badge-bg);
    color: var(--badge-text);
    border-color: var(--badge-bg);
}

/* Flashcard Quantity Selector */
.flashcard-quantity-selector {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid var(--section-bg);
}

.flashcard-quantity-label {
    font-size: 0.9em;
    color: var(--card-text);
    opacity: 0.8;
    margin-bottom: 10px;
    font-weight: 600;
}

.flashcard-quantity-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: center;
}

.flashcard-quantity-btn {
    padding: 8px 18px;
    border: 2px solid var(--section-bg);
    border-radius: 15px;
    background: var(--card-bg);
    color: var(--card-text);
    font-size: 0.9em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 50px;
}

.flashcard-quantity-btn:hover {
    background: var(--section-bg);
    border-color: var(--badge-bg);
    transform: translateY(-1px);
}

.flashcard-quantity-btn.active {
    background: var(--badge-bg);
    color: var(--badge-text);
    border-color: var(--badge-bg);
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

/* Keyboard Hint */
.keyboard-hint {
    text-align: center;
    margin-top: 20px;
    font-size: 0.85em;
    color: var(--card-text);
    opacity: 0.6;
}

.keyboard-hint kbd {
    display: inline-block;
    padding: 3px 8px;
    background: var(--section-bg);
    border-radius: 5px;
    font-family: monospace;
    font-size: 0.9em;
    margin: 0 2px;
}

/* Progress Bar */
.flashcard-progress-bar {
    width: 100%;
    height: 6px;
    background: var(--section-bg);
    border-radius: 10px;
    overflow: hidden;
    margin-top: 15px;
}

.flashcard-progress-fill {
    height: 100%;
    background: var(--badge-bg);
    border-radius: 10px;
    transition: width 0.3s ease;
}

/* Stats Display */
.flashcard-stats {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 20px;
    font-size: 0.9em;
}

.flashcard-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 10px 20px;
    background: var(--section-bg);
    border-radius: 10px;
}

.flashcard-stat-value {
    font-size: 1.4em;
    font-weight: 700;
    color: var(--header-color);
}

.flashcard-stat-label {
    font-size: 0.85em;
    color: var(--card-text);
    opacity: 0.7;
    margin-top: 5px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .flashcard-modal {
        padding: 20px;
        margin: 10px;
    }

    .flashcard-title {
        font-size: 1.4em;
    }

    .flashcard-face {
        min-height: 200px;
        padding: 25px 20px;
    }

    .flashcard-content {
        font-size: 1.1em;
    }

    .flashcard-controls {
        gap: 10px;
    }

    .flashcard-btn {
        padding: 10px 18px;
        font-size: 0.9em;
    }

    .flashcard-stats {
        gap: 10px;
    }

    .flashcard-stat {
        padding: 8px 15px;
    }
}

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

    .flashcard-modal {
        padding: 15px;
    }

    .flashcard-face {
        min-height: 200px;
        padding: 20px 15px;
    }

    .flashcard-content {
        font-size: 1em;
    }

    .flashcard-btn {
        padding: 8px 15px;
        font-size: 0.85em;
    }

    .flashcard-toggle-btn {
        padding: 8px 15px;
        font-size: 12px;
    }
}

/* Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.flashcard-container.active .flashcard-modal {
    animation: fadeIn 0.3s ease;
}