/* ========================================
   Quiz Mode Styles
   Uses variables.css tokens
======================================== */

/* Quiz Keyframes */
@keyframes quiz-fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes quiz-slideInRight {
    from { opacity: 0; transform: translateX(30px); }
    to   { opacity: 1; transform: translateX(0); }
}

@keyframes quiz-scaleIn {
    from { opacity: 0; transform: scale(0.9); }
    to   { opacity: 1; transform: scale(1); }
}

@keyframes quiz-bounceIn {
    0%   { opacity: 0; transform: scale(0.3); }
    50%  { transform: scale(1.08); }
    70%  { transform: scale(0.95); }
    100% { opacity: 1; transform: scale(1); }
}

@keyframes quiz-shakeWrong {
    0%, 100% { transform: translateX(0); }
    15%  { transform: translateX(-6px); }
    30%  { transform: translateX(5px); }
    45%  { transform: translateX(-4px); }
    60%  { transform: translateX(3px); }
    75%  { transform: translateX(-2px); }
}

@keyframes quiz-pulseCorrect {
    0%   { transform: scale(1); }
    50%  { transform: scale(1.03); }
    100% { transform: scale(1); }
}

@keyframes quiz-shimmer {
    0%   { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes quiz-countReveal {
    from { opacity: 0; transform: scale(0.5) translateY(10px); }
    to   { opacity: 1; transform: scale(1) translateY(0); }
}

@keyframes quiz-ringDraw {
    from { stroke-dashoffset: 440; }
}

.quiz-section {
    position: relative;
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: safe center;
    overflow-y: auto;
    padding: var(--space-6);
    background: transparent;
}

.quiz-back-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    background: var(--bg-glass);
    border: 1px solid var(--border-default);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-spring);
    align-self: flex-start;
    margin-bottom: var(--space-4);
    flex-shrink: 0;
}

.quiz-back-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.quiz-panel {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

/* ========================================
   Setup Panel
======================================== */

.quiz-setup-card {
    position: relative;
    width: 100%;
    max-width: 780px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent 24%),
        var(--bg-panel);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-default);
    padding: clamp(24px, 4vw, 36px);
    box-shadow: var(--shadow-floating);
}

/* Quiz wizard steps — inherit layout from .setup-step via identical structure */
.quiz-step {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.quiz-step h2 {
    font-size: clamp(1.7rem, 3vw, 2.2rem);
    font-weight: 800;
    color: var(--text-primary);
    text-align: center;
    margin: 0;
    letter-spacing: -0.03em;
}

/* Generate button — extends .generate-btn from flashcards.css */
.quiz-generate-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.quiz-generate-btn:hover:not(:disabled) {
    transform: translateY(-2px) scale(1.02);
    box-shadow: var(--shadow-glow);
}

.quiz-generate-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.quiz-generate-spinner {
    animation: quizSpin 1s linear infinite;
    flex-shrink: 0;
}

@keyframes quizSpin {
    to { transform: rotate(360deg); }
}

.quiz-error {
    margin-top: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-sm);
    background: var(--destructive-subtle);
    color: var(--destructive);
    font-size: 13px;
}

/* ========================================
   Quiz Play Panel
======================================== */

.quiz-play-card {
    width: 100%;
    max-width: 760px;
    background: var(--bg-panel);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-default);
    padding: clamp(24px, 4vw, 36px);
    box-shadow: var(--shadow-floating);
}

.quiz-play-card.quiz-play-intro {
    animation: quiz-fadeInUp 0.4s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.quiz-play-card.quiz-question-transition {
    animation: quiz-slideInRight 0.35s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* Progress bar */
.quiz-progress {
    margin-bottom: var(--space-6);
}

.quiz-progress-info {
    display: flex;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.quiz-progress-track {
    width: 100%;
    height: 6px;
    border-radius: var(--radius-full);
    background: var(--bg-hover);
    overflow: hidden;
}

[data-theme="dark"] .quiz-progress-track {
    background: rgba(255, 255, 255, 0.06);
}

.quiz-progress-fill {
    height: 100%;
    width: 0%;
    border-radius: var(--radius-full);
    background: linear-gradient(90deg, var(--accent), var(--accent-hover), var(--accent));
    background-size: 200% 100%;
    transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1);
    animation: quiz-shimmer 3s linear infinite;
}

/* Question */
.quiz-question {
    font-size: 19px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.6;
    margin-bottom: var(--space-6);
}

/* Options */
.quiz-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-bottom: var(--space-5);
}

.quiz-option {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-4);
    border-radius: var(--radius-xl);
    border: 1.5px solid var(--border-default);
    background: var(--bg-glass);
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
    text-align: left;
    width: 100%;
    font-size: 14px;
    color: var(--text-primary);
    line-height: 1.5;
}

.quiz-option:hover:not(.disabled) {
    border-color: var(--accent);
    background: var(--accent-subtle);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.quiz-option:active:not(.disabled) {
    transform: scale(0.99);
    transition-duration: 0.1s;
}

.quiz-option.selected {
    border-color: var(--accent);
    background: var(--accent-subtle);
    transform: scale(1.01);
    box-shadow: 0 0 0 3px rgba(245, 184, 0, 0.08);
}

.quiz-option.correct {
    border-color: var(--success);
    background: var(--success-subtle);
    animation: quiz-pulseCorrect 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.quiz-option.incorrect {
    border-color: var(--destructive);
    background: var(--destructive-subtle);
    animation: quiz-shakeWrong 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.quiz-option.disabled {
    cursor: default;
    opacity: 0.85;
}

.quiz-option-letter {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: var(--bg-hover);
    font-size: 13px;
    font-weight: 700;
    color: var(--text-secondary);
}

[data-theme="dark"] .quiz-option-letter {
    background: rgba(255, 255, 255, 0.06);
}

.quiz-option.selected .quiz-option-letter {
    background: var(--accent);
    color: var(--accent-text);
    transform: scale(1.1);
}

.quiz-option.correct .quiz-option-letter {
    background: var(--success);
    color: #fff;
    transform: scale(1.15);
}

.quiz-option.incorrect .quiz-option-letter {
    background: var(--destructive);
    color: #fff;
    transform: scale(1.15);
}

.quiz-option-letter {
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.quiz-option-text {
    flex: 1;
    padding-top: 3px;
}

/* Explanation */
.quiz-explanation {
    padding: var(--space-4);
    border-radius: var(--radius-xl);
    background: var(--accent-subtle);
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: var(--space-5);
    border-left: 3px solid var(--accent);
}

/* Action buttons */
.quiz-actions {
    display: flex;
    gap: var(--space-3);
}

.quiz-submit-btn,
.quiz-next-btn {
    flex: 1;
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-xl);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}

.quiz-submit-btn {
    background: var(--brand-gradient);
    color: var(--accent-text);
}

.quiz-submit-btn:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow);
}

.quiz-submit-btn:active:not(:disabled) {
    transform: scale(0.97);
    transition-duration: 0.1s;
}

.quiz-submit-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.quiz-next-btn {
    background: var(--brand-gradient);
    color: var(--accent-text);
}

.quiz-next-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow);
}

.quiz-next-btn:active {
    transform: scale(0.97);
    transition-duration: 0.1s;
}

/* ========================================
   Results Panel
======================================== */

.quiz-results-card {
    width: 100%;
    max-width: 680px;
    background: var(--bg-panel);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-default);
    padding: clamp(24px, 4vw, 36px);
    box-shadow: var(--shadow-floating);
    text-align: center;
    animation: quiz-fadeInUp 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.quiz-results-header {
    margin-bottom: var(--space-8);
}

.quiz-score-circle {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 140px;
    height: 140px;
    border-radius: 50%;
    border: 4px solid var(--accent);
    margin: 0 auto var(--space-4);
    animation: quiz-bounceIn 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
    transition: border-color 0.5s ease;
}

.quiz-score-number {
    font-size: 48px;
    font-weight: 800;
    color: var(--accent);
    line-height: 1;
    animation: quiz-countReveal 0.5s 0.3s cubic-bezier(0.22, 1, 0.36, 1) both;
    transition: color 0.5s ease;
}

.quiz-score-total {
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 500;
    animation: quiz-fadeInUp 0.4s 0.4s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.quiz-score-label {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    animation: quiz-fadeInUp 0.4s 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* Missed questions */
.quiz-missed-section {
    text-align: left;
    margin-bottom: var(--space-6);
    animation: quiz-fadeInUp 0.4s 0.6s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.quiz-missed-section h3 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

.quiz-missed-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.quiz-missed-item {
    padding: var(--space-4);
    border-radius: var(--radius-xl);
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
    text-align: left;
    font-size: 13px;
    line-height: 1.6;
    animation: quiz-fadeInUp 0.35s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.quiz-missed-item:nth-child(1) { animation-delay: 0.65s; }
.quiz-missed-item:nth-child(2) { animation-delay: 0.72s; }
.quiz-missed-item:nth-child(3) { animation-delay: 0.79s; }
.quiz-missed-item:nth-child(4) { animation-delay: 0.86s; }
.quiz-missed-item:nth-child(5) { animation-delay: 0.93s; }

.quiz-missed-q {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-1);
}

.quiz-missed-your {
    color: var(--destructive);
}

.quiz-missed-correct {
    color: var(--success);
}

/* Results action buttons container */
.quiz-results-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    animation: quiz-fadeInUp 0.4s 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* Retry button */
.quiz-retry-btn {
    padding: var(--space-3) var(--space-8);
    border-radius: var(--radius-xl);
    background: var(--brand-gradient);
    color: var(--accent-text);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}

.quiz-retry-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.quiz-retry-btn:active {
    transform: scale(0.97);
    transition-duration: 0.1s;
}

/* Practice wrong answers button */
.quiz-practice-wrong-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-xl);
    background: var(--destructive-subtle);
    border: 1.5px solid var(--destructive);
    color: var(--destructive);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}

.quiz-practice-wrong-btn:hover {
    background: var(--destructive);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(239, 68, 68, 0.3);
}

.quiz-practice-wrong-btn:hover svg {
    stroke: #fff;
}

.quiz-practice-wrong-btn:active {
    transform: scale(0.97);
    transition-duration: 0.1s;
}

/* ========================================
   Responsive
======================================== */

@media (max-width: 640px) {
    .quiz-section {
        padding: var(--space-4);
    }

    .quiz-setup-card,
    .quiz-play-card,
    .quiz-results-card {
        padding: var(--space-5);
        border-radius: var(--radius-xl);
    }

    .quiz-subject-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .quiz-subject-btn {
        min-height: 52px;
    }

    .quiz-question {
        font-size: 15px;
        margin-bottom: var(--space-4);
    }

    .quiz-option {
        padding: var(--space-3);
        min-height: 52px;
    }

    .quiz-submit-btn,
    .quiz-next-btn {
        min-height: 48px;
    }

    .quiz-generate-btn {
        min-height: 52px;
    }

    .quiz-back-btn {
        min-height: 44px;
    }

    .quiz-retry-btn,
    .quiz-practice-wrong-btn {
        min-height: 48px;
        width: 100%;
        justify-content: center;
    }

    .quiz-step h2 {
        font-size: 1.5rem;
    }

    .quiz-explanation {
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    .quiz-section {
        padding-bottom: calc(60px + env(safe-area-inset-bottom, 0));
    }
}