/* ========================================
   FLASHCARD ACTIVITY COMPONENT
   ======================================== */

/* Container */
.flashcard-activity {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
    font-family: var(--font-family);
}

/* Progress indicator */
.flashcard-progress {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.flashcard-progress-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: #e0e0e0;
    transition: all 0.3s ease;
}

.flashcard-progress-dot.current {
    background-color: var(--primary-color);
    transform: scale(1.3);
}

.flashcard-progress-dot.correct {
    background-color: #28a745;
}

.flashcard-progress-dot.wrong {
    background-color: #dc3545;
}

/* Card counter */
.flashcard-counter {
    text-align: center;
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 1rem;
}

/* The flashcard */
.flashcard-card {
    background: var(--white-color);
    border-radius: 20px;
    padding: 2.5rem 3rem;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    position: relative;
    overflow: hidden;
    border: 2px solid transparent;
    max-width: 850px;
    margin: 0 auto;
}

.flashcard-difficulty {
    text-align: center;
    margin-bottom: 1rem;
}

.flashcard-difficulty .difficulty-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.flashcard-difficulty .difficulty-badge.easy {
    background: #d4edda;
    color: #155724;
}

.flashcard-difficulty .difficulty-badge.medium {
    background: #fff3cd;
    color: #856404;
}

.flashcard-difficulty .difficulty-badge.hard {
    background: #f8d7da;
    color: #721c24;
}

.flashcard-prompt {
    text-align: center;
    font-size: 1.1rem;
    color: var(--dark-color);
    margin-bottom: 1.5rem;
}

/* Graph container */
.flashcard-graph-container {
    display: flex;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.flashcard-graph-container svg {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    background: #fafafa;
}

/* Input and button */
.flashcard-input-group {
    display: flex;
    gap: 0.75rem;
}

/* MathLive math field styling */
.flashcard-math-input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 2px solid #e2e8f0;
    border-radius: 10px;
    font-size: 1.3rem;
    background: white;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.flashcard-math-input:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.2);
}

.flashcard-math-input.error {
    border-color: #dc3545;
}

.flashcard-math-input[disabled] {
    opacity: 0.7;
    pointer-events: none;
}

/* Hide MathLive menu button (hamburger with matrices/integrals) */
.flashcard-math-input::part(menu-toggle) {
    display: none !important;
}

.flashcard-submit-btn {
    padding: 0.875rem 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.flashcard-submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.flashcard-submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Attempts indicator */
.flashcard-attempts {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    justify-content: center;
}

.flashcard-attempt-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: #28a745;
    transition: background-color 0.3s ease;
}

.flashcard-attempt-dot.used {
    background-color: #dc3545;
}

/* Feedback message */
.flashcard-feedback {
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
}

.flashcard-feedback.hint {
    background: #fff3cd;
    color: #856404;
}

.flashcard-feedback.answer-reveal {
    background: #cce5ff;
    color: #004085;
}

/* ========================================
   FLASHCARD ANIMATIONS
   ======================================== */

/* Card rush in animation */
@keyframes cardRushIn {
    0% {
        opacity: 0;
        transform: translateX(100%) scale(0.8) rotate(5deg);
    }
    60% {
        opacity: 1;
        transform: translateX(-20px) scale(1.02) rotate(-1deg);
    }
    80% {
        transform: translateX(10px) scale(0.99) rotate(0.5deg);
    }
    100% {
        opacity: 1;
        transform: translateX(0) scale(1) rotate(0);
    }
}

.flashcard-card.entering {
    animation: cardRushIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

/* Shake animation (wrong answer) - subtle nudge */
@keyframes cardShake {
    0%, 100% { transform: translateX(0); }
    25%, 75% { transform: translateX(-3px); }
    50% { transform: translateX(3px); }
}

.flashcard-card.shaking {
    animation: cardShake 0.5s ease-in-out;
}

/* Wrong answer flash */
.flashcard-card.wrong-flash {
    background: linear-gradient(135deg, #fff5f5 0%, #ffe0e0 100%);
    border-color: #dc3545;
}

/* Put away animation (correct answer) */
@keyframes cardPutAway {
    0% {
        opacity: 1;
        transform: translateY(0) scale(1) rotate(0);
    }
    30% {
        opacity: 1;
        transform: translateY(-20px) scale(1.05) rotate(-2deg);
    }
    100% {
        opacity: 0;
        transform: translateY(-150%) scale(0.7) rotate(-10deg);
    }
}

.flashcard-card.exiting {
    animation: cardPutAway 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* Correct answer celebration flash */
.flashcard-card.correct-flash {
    background: linear-gradient(135deg, #f0fff4 0%, #c6f6d5 100%);
    border-color: #28a745;
}

/* ========================================
   FLASHCARD END SCREEN
   ======================================== */

.flashcard-end-screen {
    text-align: center;
    padding: 2rem;
    background: var(--white-color);
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.flashcard-score-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color) 0%, #764ba2 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin: 0 auto 1.5rem;
    color: white;
}

.flashcard-score-number {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1;
}

.flashcard-score-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

.flashcard-end-screen h2 {
    color: var(--dark-color);
    margin-bottom: 1rem;
}

.flashcard-results-summary {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin: 1.5rem 0;
}

.flashcard-result-stat {
    text-align: center;
}

.flashcard-result-stat .number {
    font-size: 1.5rem;
    font-weight: 700;
}

.flashcard-result-stat .label {
    font-size: 0.85rem;
    color: #666;
}

.flashcard-result-stat.correct .number {
    color: #28a745;
}

.flashcard-result-stat.wrong .number {
    color: #dc3545;
}

.flashcard-tricky-list {
    text-align: left;
    background: #f8f9fa;
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1.5rem;
}

.flashcard-tricky-list h4 {
    margin-bottom: 0.75rem;
    color: #fd7e14;
}

.flashcard-tricky-item {
    padding: 0.5rem 0;
    border-bottom: 1px solid #e9ecef;
    font-size: 0.9rem;
}

.flashcard-tricky-item:last-child {
    border-bottom: none;
}

.flashcard-tricky-item .correct-answer {
    font-weight: 600;
    color: var(--dark-color);
}

.flashcard-tricky-item .your-answer {
    color: #dc3545;
    font-size: 0.85rem;
}

.flashcard-restart-btn {
    margin-top: 1.5rem;
    padding: 1rem 2rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.flashcard-restart-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

/* ========================================
   FLASHCARD PAGE HEADER
   ======================================== */

.flashcard-page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 40px 0 30px;
    text-align: center;
    color: white;
    margin-bottom: 2rem;
}

.flashcard-page-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.flashcard-page-header p {
    opacity: 0.9;
    font-size: 1rem;
}

.flashcard-page-header .back-link {
    display: inline-block;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    transition: color 0.3s ease;
}

.flashcard-page-header .back-link:hover {
    color: white;
}

.flashcard-page-header .back-link::before {
    content: '\2190';
    margin-right: 0.5rem;
}

.flashcard-page-header .header-top-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.flashcard-page-header .header-top-row .back-link {
    margin-bottom: 0;
}

.flashcard-page-header .header-top-row .back-link::before {
    display: none;
}

/* Responsive */
@media (max-width: 500px) {
    .flashcard-activity {
        padding: 0 0.5rem;
    }

    .flashcard-card {
        padding: 1.5rem 1rem;
    }

    .flashcard-input-group {
        flex-direction: column;
    }

    .flashcard-submit-btn {
        width: 100%;
    }

    .flashcard-results-summary {
        gap: 1rem;
    }

    .flashcard-page-header .header-top-row {
        flex-direction: column;
        gap: 0.75rem;
    }

}