/* ============================================================
   SwapxLearn – Quiz Styles
   ============================================================ */

.quiz-arena {
    max-width: 780px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* ── Category Select Screen ─────────────────────────── */
.quiz-start {
    text-align: center;
}

.quiz-start h1 {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.quiz-start p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 40px;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.cat-pick-card {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px 20px;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
}

.cat-pick-card:hover,
.cat-pick-card.selected {
    border-color: var(--primary);
    background: rgba(79, 142, 247, 0.08);
    transform: translateY(-4px);
    box-shadow: 0 0 20px rgba(79, 142, 247, 0.2);
}

.cat-pick-card .icon {
    font-size: 2.2rem;
    margin-bottom: 10px;
}

.cat-pick-card .name {
    font-size: 0.95rem;
    font-weight: 700;
}

.cat-pick-card .count {
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ── Quiz Header ────────────────────────────────────── */
.quiz-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    gap: 20px;
}

.quiz-category-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.quiz-timer {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: 'Fira Code', monospace;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-green);
    background: rgba(57, 255, 20, 0.1);
    border: 1px solid rgba(57, 255, 20, 0.25);
    padding: 8px 16px;
    border-radius: 50px;
    min-width: 100px;
    justify-content: center;
    transition: color 0.3s, border-color 0.3s;
}

.quiz-timer.warning {
    color: var(--accent-orange);
    border-color: rgba(255, 179, 71, 0.4);
    background: rgba(255, 179, 71, 0.1);
    animation: timerPulse 0.5s infinite;
}

.quiz-timer.danger {
    color: var(--accent-red);
    border-color: rgba(255, 107, 107, 0.4);
    background: rgba(255, 107, 107, 0.1);
}

@keyframes timerPulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

.quiz-progress-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

/* ── Question Card ──────────────────────────────────── */
.question-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 36px;
    margin-bottom: 24px;
    animation: fadeInUp 0.4s ease;
}

.question-num {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 16px;
}

.question-text {
    font-size: 1.2rem;
    font-weight: 700;
    line-height: 1.5;
    margin-bottom: 28px;
}

.options-grid {
    display: grid;
    gap: 12px;
}

.option-btn {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    background: var(--bg-surface);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    text-align: left;
    width: 100%;
    font-family: 'Inter', sans-serif;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.option-btn:hover:not(:disabled) {
    border-color: var(--primary);
    background: rgba(79, 142, 247, 0.08);
    transform: translateX(4px);
}

.option-letter {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    flex-shrink: 0;
    transition: all var(--transition);
}

.option-btn.correct {
    border-color: var(--accent-green);
    background: rgba(57, 255, 20, 0.08);
}

.option-btn.correct .option-letter {
    background: var(--accent-green);
    color: #000;
    border-color: var(--accent-green);
}

.option-btn.wrong {
    border-color: var(--accent-red);
    background: rgba(255, 107, 107, 0.08);
}

.option-btn.wrong .option-letter {
    background: var(--accent-red);
    color: #fff;
    border-color: var(--accent-red);
}

.option-btn:disabled {
    cursor: not-allowed;
}

/* ── Explanation Box ────────────────────────────────── */
.explanation-box {
    display: none;
    margin-top: 16px;
    padding: 16px 20px;
    background: rgba(79, 142, 247, 0.08);
    border: 1px solid rgba(79, 142, 247, 0.25);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    animation: fadeIn 0.3s ease;
}

.explanation-box.show {
    display: block;
}

.explanation-box strong {
    color: var(--primary);
}

/* ── Quiz Navigation ────────────────────────────────── */
.quiz-nav {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 8px;
}

/* ── Results Screen ─────────────────────────────────── */
.results-screen {
    text-align: center;
    animation: fadeInUp 0.5s ease;
}

.score-circle {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    border: 6px solid var(--primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto 32px;
    position: relative;
    background: radial-gradient(circle, rgba(79, 142, 247, 0.12), transparent);
    box-shadow: 0 0 40px rgba(79, 142, 247, 0.3);
}

.score-number {
    font-family: 'Outfit', sans-serif;
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.score-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

.result-badge {
    display: inline-block;
    padding: 8px 24px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.result-badge.pass {
    background: rgba(57, 255, 20, 0.15);
    border: 2px solid rgba(57, 255, 20, 0.4);
    color: var(--accent-green);
}

.result-badge.fail {
    background: rgba(255, 107, 107, 0.12);
    border: 2px solid rgba(255, 107, 107, 0.3);
    color: var(--accent-red);
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin: 32px 0;
}

.result-stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px 16px;
    text-align: center;
}

.result-stat-value {
    font-family: 'Outfit', sans-serif;
    font-size: 1.8rem;
    font-weight: 800;
}

.result-stat-label {
    font-size: 0.78rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ── Review Mode ────────────────────────────────────── */
.review-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 16px;
    text-align: left;
}

.review-item.correct-item {
    border-left: 4px solid var(--accent-green);
}

.review-item.wrong-item {
    border-left: 4px solid var(--accent-red);
}

.review-question {
    font-weight: 700;
    margin-bottom: 12px;
}

.review-answer {
    font-size: 0.9rem;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    display: inline-block;
    margin-bottom: 8px;
}

.review-answer.correct {
    background: rgba(57, 255, 20, 0.1);
    color: var(--accent-green);
}

.review-answer.wrong {
    background: rgba(255, 107, 107, 0.1);
    color: var(--accent-red);
}

.review-explanation {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 10px;
    line-height: 1.6;
}

/* ── Responsive ─────────────────────────────────────── */
@media (max-width: 600px) {
    .question-card {
        padding: 24px 20px;
    }

    .question-text {
        font-size: 1.05rem;
    }

    .result-stats {
        grid-template-columns: 1fr;
    }

    .quiz-header {
        flex-wrap: wrap;
    }
}