/*
 * Claude Code Quiz System — PKA-STYLE rewrite (dual-theme, default dark).
 *
 * Consumes the SAME pka tokens defined in ../../assets/css/styles.css (loaded
 * BEFORE this file on both quiz pages), so the quiz UI re-skins for free across
 * [data-theme="dark"] / [data-theme="light"] and inherits the shared atmosphere
 * (no background override here — the body texture shows through glassy panels).
 *
 * Legacy quiz token names (--text-primary, --success-green, …) are KEPT and
 * remapped to pka tokens, because the quiz ENGINE injects some of them inline
 * (e.g. quiz-engine.js writes `color: var(--success-green)`), so the names must
 * keep resolving. They reference styles.css vars via var(), so they stay
 * theme-aware automatically.
 *
 * Status colours (correct = green / incorrect = red) are ALWAYS paired with an
 * icon and/or a ✓/✗ glyph so colour is never the only signal (WCAG 1.4.1).
 */

/* ============================================ */
/* Token remap (theme-aware via styles.css vars) + quiz-local spacing */
/* ============================================ */
:root {
    /* colour aliases → pka tokens (resolved lazily, so they follow the theme) */
    --text-primary: var(--heading);
    --text-secondary: var(--secondary-text-color);
    --background: var(--background-color);
    --border: var(--border-color);
    --link-blue: var(--accent-color);

    --success-green: var(--lamp);    /* status GREEN (engine references this inline) */
    --error-red: var(--crimson);     /* status RED */
    --warning-yellow: var(--gold);
    --progress-blue: var(--gold);
    --card-hover: rgba(var(--gold-rgb), .07);

    /* layout (quiz-local; not colour) */
    --container-max-width: 820px;
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 20px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
}

/* ============================================ */
/* Icon Styles                                  */
/* ============================================ */
.icon {
    display: inline-block;
    width: 20px;
    height: 20px;
    vertical-align: middle;
    stroke: currentColor;
    stroke-width: 1.5;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.icon-sm { width: 16px; height: 16px; }
.icon-md { width: 20px; height: 20px; }
.icon-lg { width: 24px; height: 24px; }

/* ============================================ */
/* Base                                         */
/* ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--sans);
    color: var(--text-color);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* NOTE: no background here — let the shared pka atmosphere (styles.css) show. */
}

/* override the inherited .container{display:flex} from styles.css — the quiz
   dashboard centres a single column, it is NOT the tutorial's two-pane flex. */
.container {
    display: block;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

/* ============================================ */
/* Header                                       */
/* ============================================ */
.quiz-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.quiz-header h1 {
    font-family: var(--serif);
    font-size: 2.6rem;
    font-weight: 400;
    letter-spacing: .2px;
    color: var(--heading);
    margin-bottom: var(--spacing-sm);
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--gold-text);
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s ease, color 0.2s ease;
}

.back-link:hover {
    transform: translateX(-4px);
    color: var(--gold-soft);
}

/* theme + atmosphere toggles in the quiz header (centered row) */
.quiz-header-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: var(--spacing-md);
}

/* ============================================ */
/* Progress Overview                            */
/* ============================================ */
.progress-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--panel-solid);
    border-radius: 16px;
    border: 1px solid var(--panel-edge);
    box-shadow: inset 0 1px 0 var(--inset-hi), var(--card-shadow);
}

.stat-value {
    font-family: var(--serif);
    font-size: 2.6rem;
    font-weight: 400;
    color: var(--gold-text);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-family: var(--mono);
    font-size: 0.75rem;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--text-secondary);
    font-weight: 600;
}

/* ============================================ */
/* Section Headers                              */
/* ============================================ */
.section-header {
    grid-column: 1 / -1;
    margin: var(--spacing-xl) 0 var(--spacing-md) 0;
}

.section-header:first-child {
    margin-top: 0;
}

.section-header h2 {
    font-family: var(--serif);
    font-size: 1.85rem;
    font-weight: 400;
    color: var(--heading);
    margin-bottom: var(--spacing-xs);
}

.section-header p {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* ============================================ */
/* Chapter Grid                                 */
/* ============================================ */
.chapter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

/* ============================================ */
/* Chapter Cards — glassy gold-edged panels     */
/* ============================================ */
.chapter-card {
    display: block;
    padding: var(--spacing-lg);
    background: var(--panel-solid);
    border: 1px solid var(--panel-edge);
    border-radius: 16px;
    text-decoration: none;
    color: var(--text-color);
    transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
    cursor: pointer;
    box-shadow: inset 0 1px 0 var(--inset-hi), var(--card-shadow);
}

.chapter-card:hover {
    transform: translateY(-4px);
    border-color: var(--edge-strong);
    box-shadow: var(--hover-glow);
}

/* completed — gold left accent + soft tint */
.chapter-card.completed {
    border-left: 3px solid var(--gold);
    background-image: radial-gradient(420px 220px at 0% 0%, rgba(var(--gold-rgb), .08), transparent 70%);
}

.chapter-card.completed:hover {
    transform: translateY(-6px);
    box-shadow: var(--hover-glow);
}

/* perfect score — gold ring + non-emoji mono badge */
.chapter-card.perfect-score {
    border-color: var(--gold);
    box-shadow: 0 0 0 1px rgba(var(--gold-rgb), .4), 0 0 28px -8px rgba(var(--gold-rgb), .5);
    position: relative;
}

.chapter-card.perfect-score::after {
    content: "100%";
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    font-family: var(--mono);
    font-size: 0.62rem;
    font-weight: 600;
    letter-spacing: .12em;
    color: var(--on-gold);
    background: var(--gold-fill);
    padding: 3px 8px;
    border-radius: 999px;
}

/* bonus + master quiz — gold-edged feature cards */
.chapter-card.bonus,
.chapter-card.master-quiz {
    border: 1px solid var(--gold);
    background-image: radial-gradient(520px 260px at 100% 0%, rgba(var(--gold-rgb), .10), transparent 70%);
    position: relative;
}

.chapter-card.bonus:hover,
.chapter-card.master-quiz:hover {
    transform: translateY(-6px);
    box-shadow: var(--hover-glow);
    border-color: var(--gold-soft);
}

.chapter-card.master-quiz .chapter-number {
    color: var(--gold-text);
    font-size: 0.875rem;
    font-weight: 700;
}

.chapter-number {
    font-family: var(--mono);
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--gold-label);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-xs);
}

.chapter-title {
    font-family: var(--serif);
    font-size: 1.35rem;
    font-weight: 400;
    color: var(--heading);
    margin-bottom: var(--spacing-xs);
}

.chapter-desc {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.chapter-status {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 999px;
    font-family: var(--mono);
    font-size: 0.7rem;
    letter-spacing: .08em;
    text-transform: uppercase;
    font-weight: 600;
}

.status-badge.not-started {
    background: rgba(var(--gold-rgb), .08);
    border: 1px solid var(--panel-edge);
    color: var(--text-secondary);
}

.status-badge.completed {
    background: var(--gold-fill);
    color: var(--on-gold);
    font-weight: 700;
}

/* ============================================ */
/* Footer                                       */
/* ============================================ */
.quiz-footer {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-family: var(--mono);
    font-size: 0.8rem;
    letter-spacing: .04em;
}

.quiz-footer p {
    margin: var(--spacing-xs) 0;
}

.btn-clear-progress {
    margin-top: var(--spacing-lg);
    padding: 10px 20px;
    background: transparent;
    border: 1px solid var(--crimson);
    border-radius: 999px;
    color: var(--crimson);
    font-family: var(--mono);
    font-size: 0.8rem;
    letter-spacing: .06em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-clear-progress:hover {
    background: var(--crimson);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px -8px var(--crimson);
}

.btn-clear-progress:active {
    transform: translateY(0);
}

.btn-clear-progress:focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 2px;
}

/* ============================================ */
/* Quiz Page (quiz.html)                        */
/* ============================================ */
.quiz-wrapper {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

.quiz-progress {
    margin-bottom: var(--spacing-lg);
}

.progress-text {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    font-family: var(--mono);
    font-size: 0.8rem;
    letter-spacing: .04em;
    color: var(--text-secondary);
}

.progress-bar-container {
    width: 100%;
    height: 8px;
    background: rgba(var(--gold-rgb), .12);
    border-radius: 999px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--gold-deep), var(--gold));
    transition: width 0.5s ease;
    border-radius: 999px;
}

.keyboard-hint {
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-sm);
}

.keyboard-hint kbd {
    display: inline-block;
    padding: 2px 6px;
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: var(--mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gold-soft);
    margin: 0 2px;
}

/* ============================================ */
/* Question Card                                */
/* ============================================ */
.question-card {
    background: var(--panel-solid);
    border: 1px solid var(--panel-edge);
    border-radius: 16px;
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: inset 0 1px 0 var(--inset-hi), var(--card-shadow);
}

.question-number {
    font-family: var(--mono);
    font-size: 0.75rem;
    letter-spacing: .12em;
    text-transform: uppercase;
    font-weight: 600;
    color: var(--gold-label);
    margin-bottom: var(--spacing-md);
}

.question-text {
    font-family: var(--serif);
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--heading);
    margin-bottom: var(--spacing-lg);
    line-height: 1.4;
}

.options-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.option {
    background: var(--panel);
    border: 1px solid var(--panel-edge);
    border-radius: 10px;
    padding: var(--spacing-md) var(--spacing-lg);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1rem;
    text-align: left;
    width: 100%;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--text-color);
}

.option-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: rgba(var(--gold-rgb), .12);
    border-radius: 8px;
    font-family: var(--mono);
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--gold-text);
    flex-shrink: 0;
}

.option-separator {
    color: var(--text-secondary);
    font-weight: 400;
    flex-shrink: 0;
    opacity: 0.5;
}

.option-text {
    flex: 1;
}

.option:hover {
    background: var(--card-hover);
    border-color: var(--gold-label);
}

.option:focus {
    outline: none;
    border-color: var(--gold);
    box-shadow: 0 0 0 3px rgba(var(--gold-rgb), .3);
}

.option:focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 2px;
}

.option:hover .option-number {
    background: var(--gold-fill);
    color: var(--on-gold);
}

.option.selected {
    background: var(--gold-fill);
    border-color: var(--gold-fill);
    color: var(--on-gold);
    font-weight: 600;
}

.option.selected .option-number {
    background: var(--on-gold);
    color: var(--gold-deep);
}

.option.selected .option-text {
    color: var(--on-gold);
}

/* correct/incorrect — colour PAIRED with a coloured left border + a ✓/✗ glyph,
   so the state is never signalled by colour alone (WCAG 1.4.1). */
.option.correct {
    background: rgba(var(--gold-rgb), .04);
    border-color: var(--success-green);
    border-left-width: 3px;
    color: var(--success-green);
    font-weight: 600;
}

.option.correct .option-text {
    color: var(--success-green);
}

.option.correct::after {
    content: "\2713";   /* ✓ */
    margin-left: auto;
    flex-shrink: 0;
    font-weight: 700;
    color: var(--success-green);
}

.option.incorrect {
    background: transparent;
    border-color: var(--error-red);
    border-left-width: 3px;
    color: var(--error-red);
    font-weight: 600;
}

.option.incorrect .option-text {
    color: var(--error-red);
}

.option.incorrect::after {
    content: "\2717";   /* ✗ */
    margin-left: auto;
    flex-shrink: 0;
    font-weight: 700;
    color: var(--error-red);
}

.option:disabled {
    cursor: not-allowed;
    opacity: 0.6;
}

/* ============================================ */
/* Feedback Messages                            */
/* ============================================ */
.feedback {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    border-radius: 12px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feedback.correct {
    background: rgba(var(--gold-rgb), .04);
    border: 1px solid var(--success-green);
    border-left: 3px solid var(--success-green);
}

.feedback.incorrect {
    background: var(--panel-solid);
    border: 1px solid var(--error-red);
    border-left: 3px solid var(--error-red);
}

.feedback-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-family: var(--serif);
    font-size: 1.2rem;
    font-weight: 400;
}

.feedback.correct .feedback-header {
    color: var(--success-green);
}

.feedback.incorrect .feedback-header {
    color: var(--error-red);
}

.feedback-explanation {
    font-size: 0.9375rem;
    color: var(--text-color);
    line-height: 1.6;
}

/* ============================================ */
/* Buttons — gold (primary) / gold-outline      */
/* ============================================ */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border: 1px solid transparent;
    border-radius: 999px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--sans);
}

.btn:focus {
    outline: none;
}

.btn:focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 2px;
}

.btn-primary {
    background: var(--gold-fill);
    color: var(--on-gold);
    border: 1px solid var(--gold-fill);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 26px -10px rgba(var(--gold-rgb), .7);
}

.btn-primary:disabled {
    background: var(--panel);
    border-color: var(--panel-edge);
    color: var(--dim);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    background: transparent;
    color: var(--gold-text);
    border: 1px solid var(--edge-strong);
}

.btn-secondary:hover {
    background: rgba(var(--gold-rgb), .08);
    transform: translateY(-2px);
}

.btn-group {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}

/* ============================================ */
/* Results Page                                 */
/* ============================================ */
.results-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
}

.results-header {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--panel-solid);
    border: 1px solid var(--panel-edge);
    border-radius: 16px;
    margin-bottom: var(--spacing-lg);
    box-shadow: inset 0 1px 0 var(--inset-hi), var(--card-shadow);
}

.results-title {
    font-family: var(--serif);
    font-size: 2.2rem;
    font-weight: 400;
    color: var(--heading);
    margin-bottom: var(--spacing-md);
}

.score-display {
    font-family: var(--serif);
    font-size: 3rem;
    font-weight: 400;
    color: var(--gold-text);
    margin-bottom: var(--spacing-sm);
}

.score-percentage {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

.results-list {
    list-style: none;
}

.result-item {
    background: var(--panel-solid);
    border: 1px solid var(--panel-edge);
    border-left: 3px solid var(--panel-edge);
    border-radius: 12px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: inset 0 1px 0 var(--inset-hi), var(--card-shadow);
}

/* correct/incorrect distinguished by left bar colour AND the result icon */
.result-item.correct {
    border-left-color: var(--success-green);
}

.result-item.correct .result-icon {
    color: var(--success-green);
}

.result-item.incorrect {
    border-left-color: var(--error-red);
}

.result-item.incorrect .result-icon {
    color: var(--error-red);
}

.result-header {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.result-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.result-question {
    font-weight: 600;
    color: var(--heading);
    flex: 1;
}

.result-answer {
    margin-left: calc(1.5rem + var(--spacing-md));
    font-size: 0.9375rem;
}

.result-answer.user-answer {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.result-answer.correct-answer {
    color: var(--success-green);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.result-explanation {
    margin-left: calc(1.5rem + var(--spacing-md));
    margin-top: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--code-bg);
    border: 1px solid var(--panel-edge);
    border-radius: 8px;
    font-size: 0.875rem;
    color: var(--text-color);
    line-height: 1.5;
}

.export-options {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
    justify-content: center;
}

.btn-export {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 10px 20px;
    background: var(--panel);
    border: 1px solid var(--panel-edge);
    border-radius: 999px;
    color: var(--text-color);
    font-size: 0.9375rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-export:hover {
    border-color: var(--gold-label);
    color: var(--gold-text);
    background: rgba(var(--gold-rgb), .06);
}

.btn-export:focus-visible {
    outline: 3px solid var(--focus);
    outline-offset: 2px;
}

/* ============================================ */
/* Responsive Design                            */
/* ============================================ */
@media (max-width: 768px) {
    .quiz-header h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .chapter-grid {
        grid-template-columns: 1fr;
    }

    .progress-overview {
        grid-template-columns: 1fr;
    }

    .btn-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .export-options {
        flex-direction: column;
    }

    .btn-export {
        width: 100%;
        justify-content: center;
    }

    .question-card {
        padding: var(--spacing-md);
    }

    .score-display {
        font-size: 2.5rem;
    }

    /* keep header toggles compact, never full-width */
    .quiz-header-actions .theme-toggle,
    .quiz-header-actions .atmo-toggle { width: auto; }
    #atmo-toggle-label { display: none; }
}

@media (max-width: 480px) {
    .container,
    .quiz-wrapper {
        padding: var(--spacing-md) var(--spacing-sm);
    }

    .quiz-header h1 {
        font-size: 1.75rem;
    }

    .question-text {
        font-size: 1.25rem;
    }

    .chapter-card {
        padding: var(--spacing-md);
    }

    .stat {
        padding: var(--spacing-md);
    }

    .stat-value {
        font-size: 2rem;
    }
}

/* ============================================ */
/* Loading Animation                            */
/* ============================================ */
.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-xl);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(var(--gold-rgb), .15);
    border-top-color: var(--gold);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* respect reduced motion for the spinner + card transitions */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: .01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: .01ms !important;
    }
}

/* ============================================ */
/* Hidden Class                                 */
/* ============================================ */
.hidden {
    display: none !important;
}