/* Quizzes — index cards + quiz engine */

/* The `hidden` attribute must always win over component display rules
   (e.g. .quiz-controls{display:flex}), otherwise JS-hidden elements linger. */
[hidden] { display: none !important; }

/* Local state colors (no success/danger tokens exist in :root) */
:root {
    --quiz-success: var(--color-primary);
    --quiz-success-bg: #f0fdf9;
    --quiz-danger: #dc2626;
    --quiz-danger-bg: #fef2f2;
}

main {
    margin-top: 6rem;
    padding: 2rem 0;
}

/* ---- Index grid ------------------------------------------------------- */
.quiz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.quiz-card {
    display: block;
    text-decoration: none;
    color: inherit;
}

.quiz-card .post-content h3 {
    margin-bottom: 8px;
    font-size: 1.2rem;
    font-weight: 700;
    font-family: var(--font-display);
    color: var(--color-text-body);
}

.quiz-card:hover .post-content h3 {
    color: var(--color-primary);
}

.quiz-card-meta {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--color-text-muted);
    font-size: 0.82rem;
    font-family: var(--font-body);
    font-weight: 500;
}

.quiz-card-meta i {
    color: var(--color-primary);
}

/* Quiz cards reuse tutorials' .post-card; meta sits above the CTA */
.post-card .quiz-card-meta {
    margin: 2px 0 14px;
}

/* Difficulty is a FILLED badge with a level icon; topic tags are OUTLINED
   ghosts. Distinction is by shape/treatment, so the green scheme stays intact. */
.tag-chip-difficulty {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: var(--color-primary);
    color: #fff;
    border: 1px solid var(--color-primary);
}

.tag-chip-difficulty i {
    font-size: 0.7em;
}

/* Topic tags on quiz cards: outlined/ghost, clearly secondary to the badge */
#quizzes-container .tag-chip:not(.tag-chip-difficulty) {
    background: transparent;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
}

/* ---- Filter groups (Level = OR, Topic = AND) -------------------------- */
.filter-group {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
    margin-bottom: 0.75rem;
}

.filter-group-label {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-weight: 800;
    color: var(--color-text-body);
    min-width: 3.5rem;
}

.level-filter,
.tag-filter {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* Levels as a brand-green intensity ramp: light -> dark = easy -> hard */
.tag-chip-difficulty.level-junior {
    background: #cdeee1;
    color: var(--color-primary-dark);
    border-color: #cdeee1;
}
.tag-chip-difficulty.level-middle {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}
.tag-chip-difficulty.level-senior {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: #fff;
}

/* Level filter buttons: legible green outline when unselected, filled with
   the level color when selected (so the ramp reads on selection). Higher
   specificity than tutorials' .filter-btn:hover so colors survive hover. */
.filter-btn.level-btn {
    background: #fff;
    border: 1px solid var(--color-primary);
    color: var(--color-primary-dark);
}
.filter-btn.level-btn i { font-size: 0.7em; }
.filter-btn.level-btn:hover { background: #f0fdf9; }

.filter-btn.level-btn.level-junior.active {
    background: #cdeee1;
    color: var(--color-primary-dark);
    border-color: #cdeee1;
}
.filter-btn.level-btn.level-middle.active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}
.filter-btn.level-btn.level-senior.active {
    background: var(--color-primary-dark);
    color: #fff;
    border-color: var(--color-primary-dark);
}
.filter-btn.level-btn.active {
    font-weight: 700;
    box-shadow: 0 0 0 2px rgba(29, 158, 117, 0.30);
}

/* ---- Quiz page shell -------------------------------------------------- */
.quiz-page {
    padding: 100px 0 60px;
}

.quiz-back {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    color: var(--color-text-muted);
    text-decoration: none;
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: color 0.2s ease, gap 0.2s ease;
}

.quiz-back:hover {
    color: var(--color-primary);
    gap: 0.7rem;
}

.quiz-header {
    margin: 1.5rem 0 2rem;
}

.quiz-title {
    font-family: var(--font-display);
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--color-text-body);
}

.quiz-subtitle {
    margin-top: 0.5rem;
    color: var(--color-text-muted);
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
}

/* ---- Quiz card -------------------------------------------------------- */
.quiz {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 1.75rem;
    max-width: 760px;
}

.quiz-topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-muted);
}

.quiz-score {
    color: var(--color-primary);
}

.quiz-progress {
    height: 6px;
    background: var(--color-border);
    border-radius: 999px;
    overflow: hidden;
    margin-bottom: 1.75rem;
}

.quiz-progress-bar {
    height: 100%;
    width: 0;
    background: var(--color-primary);
    border-radius: 999px;
    transition: width 0.35s ease;
}

/* ---- Question --------------------------------------------------------- */
.quiz-qtype {
    display: inline-block;
    background: var(--quiz-success-bg);
    color: var(--color-primary-dark);
    padding: 0.2rem 0.7rem;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    font-family: var(--font-body);
}

.quiz-qtext {
    margin: 0.85rem 0 1.35rem;
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.5;
    color: var(--color-text-body);
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 0.7rem;
}

.quiz-option {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    width: 100%;
    text-align: left;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 10px;
    padding: 0.9rem 1rem;
    cursor: pointer;
    font-family: var(--font-body);
    font-size: 0.97rem;
    line-height: 1.5;
    color: var(--color-text-body);
    transition: border-color 0.18s ease, background 0.18s ease, transform 0.12s ease;
}

.quiz-option:hover:not(:disabled) {
    border-color: var(--color-primary);
    background: var(--quiz-success-bg);
}

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

.quiz-option-key {
    flex-shrink: 0;
    width: 26px;
    height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-family: var(--font-code);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    background: var(--color-bg-page);
}

.quiz-option.selected {
    border-color: var(--color-primary);
    background: var(--quiz-success-bg);
}

.quiz-option.selected .quiz-option-key {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.quiz-option.correct {
    border-color: var(--quiz-success);
    background: var(--quiz-success-bg);
}

.quiz-option.correct .quiz-option-key {
    background: var(--quiz-success);
    border-color: var(--quiz-success);
    color: #fff;
}

.quiz-option.incorrect {
    border-color: var(--quiz-danger);
    background: var(--quiz-danger-bg);
}

.quiz-option.incorrect .quiz-option-key {
    background: var(--quiz-danger);
    border-color: var(--quiz-danger);
    color: #fff;
}

/* ---- Explanation ------------------------------------------------------ */
.quiz-explanation {
    margin-top: 1.25rem;
    padding: 1rem 1.1rem;
    background: var(--color-bg-page);
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-primary);
    border-radius: 0 8px 8px 0;
    font-family: var(--font-body);
    font-size: 0.92rem;
    line-height: 1.65;
    color: var(--color-text-muted);
}

.quiz-explanation p {
    margin-top: 0.4rem;
}

.quiz-verdict {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 700;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.quiz-verdict.is-wrong {
    color: var(--quiz-danger);
}

/* ---- Controls --------------------------------------------------------- */
.quiz-controls {
    margin-top: 1.5rem;
    display: flex;
    justify-content: flex-end;
}

.quiz-controls .btn-primary:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
}

/* ---- Result ----------------------------------------------------------- */
.quiz-result-card {
    text-align: center;
    padding: 1rem 0 0.5rem;
}

.quiz-result-ring {
    --pct: 0;
    width: 150px;
    height: 150px;
    margin: 0 auto 1rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background:
        radial-gradient(closest-side, var(--color-bg-card) 78%, transparent 79% 100%),
        conic-gradient(var(--color-primary) calc(var(--pct) * 1%), var(--color-border) 0);
}

.quiz-result-score {
    font-family: var(--font-display);
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--color-text-body);
}

.quiz-result-score small {
    font-size: 1.2rem;
    color: var(--color-text-muted);
    font-weight: 600;
}

.quiz-result-pct {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary);
}

.quiz-result-verdict {
    margin-top: 0.4rem;
    color: var(--color-text-muted);
    font-family: var(--font-body);
}

.quiz-result-actions {
    margin-top: 1.6rem;
    display: flex;
    gap: 0.8rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ---- Review ----------------------------------------------------------- */
#quiz-review {
    margin-top: 2rem;
    border-top: 1px solid var(--color-border);
    padding-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.quiz-review-item {
    border: 1px solid var(--color-border);
    border-left: 3px solid var(--color-border);
    border-radius: 0 8px 8px 0;
    padding: 1rem 1.1rem;
}

.quiz-review-item.is-correct {
    border-left-color: var(--quiz-success);
}

.quiz-review-item.is-wrong {
    border-left-color: var(--quiz-danger);
}

.quiz-review-q {
    font-family: var(--font-display);
    font-weight: 600;
    margin-bottom: 0.7rem;
    display: flex;
    gap: 0.5rem;
    line-height: 1.5;
}

.quiz-review-item.is-correct .quiz-review-q i {
    color: var(--quiz-success);
}

.quiz-review-item.is-wrong .quiz-review-q i {
    color: var(--quiz-danger);
}

.quiz-review-opts {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    margin-bottom: 0.75rem;
}

.quiz-review-opts li {
    font-family: var(--font-body);
    font-size: 0.9rem;
    color: var(--color-text-muted);
    padding: 0.35rem 0.6rem;
    border-radius: 6px;
}

.quiz-review-opts li.opt-correct {
    background: var(--quiz-success-bg);
    color: var(--color-primary-dark);
    font-weight: 600;
}

.quiz-review-opts li.opt-wrong {
    background: var(--quiz-danger-bg);
    color: var(--quiz-danger);
}

.quiz-review-tag {
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.1rem 0.45rem;
    border-radius: 999px;
    margin-left: 0.35rem;
}

.quiz-review-tag.correct {
    background: var(--quiz-success);
    color: #fff;
}

.quiz-review-tag.wrong {
    background: var(--quiz-danger);
    color: #fff;
}

.quiz-review-exp {
    font-family: var(--font-body);
    font-size: 0.88rem;
    line-height: 1.6;
    color: var(--color-text-muted);
}

/* ---- Responsive ------------------------------------------------------- */
@media (max-width: 768px) {
    .quiz-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .quiz-title {
        font-size: 1.8rem;
    }

    .quiz {
        padding: 1.25rem;
    }

    .quiz-qtext {
        font-size: 1.1rem;
    }

    .quiz-controls {
        justify-content: stretch;
    }

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

@media (max-width: 480px) {
    .quiz-page {
        padding: 90px 0 40px;
    }

    .quiz-option {
        padding: 0.8rem;
        font-size: 0.92rem;
    }

    .quiz-result-actions {
        flex-direction: column;
    }

    .quiz-result-actions .btn-primary,
    .quiz-result-actions .btn-secondary {
        width: 100%;
        text-align: center;
    }
}