/* ============================================================================
   COURS - LECTURE (page unité -> leçons + blocks)
   ============================================================================
   Design inspiré de la maquette fournie (menu latéral + contenu).
   ATTENTION : ne pas confondre avec le builder admin (classes .lesson-*)
   NOTE :
   - Les valeurs d’offset (top / scroll-margin-top) sont alignées avec
     `public/js/course_reader.js` qui calcule le scroll en tenant compte
     de la navbar.
   ============================================================================ */
.course-reader {
    padding: 170px 0 80px;
    background:
        radial-gradient(circle at top left, #e5f2ff 0, transparent 55%),
        radial-gradient(circle at bottom right, #fee2e2 0, transparent 55%),
        #f7f8fb;
    min-height: 100vh;
}
.course-reader-container {
    max-width: 1200px;
}
.course-breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.35rem;
    font-size: 0.92rem;
    color: #6b7280;
    margin-bottom: 0.35rem;
}
.course-breadcrumb a {
    color: var(--blue);
    font-weight: 700;
    text-decoration: none;
    transition: color 0.2s ease;
}
.course-breadcrumb a:hover {
    color: var(--red);
}
.course-breadcrumb__sep {
    display: inline-flex;
    align-items: center;
    font-size: 0;
    line-height: 0;
}
.course-breadcrumb__sep::before {
    content: "\f054"; /* chevron-right (Font Awesome) */
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    font-size: 0.65rem;
    color: #c2c8d4;
}
.course-breadcrumb__current {
    color: #111827;
    font-weight: 700;
}
.course-reader-title h1 {
    color: var(--primary);
    margin: 0.2rem 0 0.6rem;
    letter-spacing: -0.02em;
}

.course-reader-layout {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 1.2rem 0 0;
}

.course-lesson-nav {
    position: sticky;
    top: 110px;
    flex: 0 0 260px;
    align-self: flex-start;
}
.course-lesson-nav__inner {
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    background: rgba(249, 250, 251, 0.95);
    border: 1px solid rgba(209, 213, 219, 0.8);
    border-radius: 18px;
    position: relative;
    padding: 0.9rem 0.85rem 0.85rem;
    box-shadow: 0 14px 30px rgba(15, 23, 42, 0.06);
}
.course-lesson-nav__label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: #9ca3af;
    margin-bottom: 0.45rem;
}
.course-lesson-nav__list {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.45rem;
    padding: 0;
    margin: 0;
    list-style: none;
}
.course-lesson-nav__link {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 0.6rem;
    font-size: 0.92rem;
    padding: 0.45rem 0.75rem;
    border-radius: 999px;
    color: #4b5563;
    border: 1px solid transparent;
    background: transparent;
    transition: all 0.25s ease;
    width: 100%;
}
.course-lesson-nav__link:hover {
    border-color: rgba(148, 163, 184, 0.7);
    background: #e5f0ff;
    color: #1f2937;
}
.course-lesson-nav__link.is-active {
    background: #111827;
    color: #f9fafb;
    border-color: #111827;
    font-weight: 700;
    transform: translateY(-1px);
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.18);
}
.course-lesson-nav__index {
    width: 28px;
    height: 28px;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    background: rgba(15, 23, 42, 0.06);
    flex: 0 0 28px;
}
.course-lesson-nav__link.is-active .course-lesson-nav__index {
    background: rgba(255, 255, 255, 0.14);
}

/* -------------------- Nouveau menu de navigation (lesson-nav) -------------------- */
.lesson-nav {
    --bg: #f4f7ff;
    --panel: #ffffff;
    --ink: #101828;
    --muted: #667085;
    --line: #d9e2ff;
    --soft: #edf2ff;
    --active: #0b1220;
    --activeText: #ffffff;
    --badge: #2f6bff;

    position: sticky;
    top: 110px;
    flex: 0 0 280px;
    align-self: flex-start;
    width: 280px;
    background: var(--bg);
    border: 1px solid rgba(16, 24, 40, 0.08);
    border-radius: 18px;
    padding: 14px;
    box-shadow: 0 14px 30px rgba(16, 24, 40, 0.10);
}

.lesson-nav__head {
    padding: 6px 6px 12px 6px;
}
.lesson-nav__level {
    font: 600 12px/1.2 "Montserrat", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    color: var(--muted);
    letter-spacing: 0.06em;
}
.lesson-nav__title {
    margin-top: 4px;
    font: 800 12px/1.2 "Montserrat", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    color: rgba(16, 24, 40, 0.55);
    letter-spacing: 0.10em;
    text-transform: uppercase;
}

.conjugation-main-items,
.conjugation-section__items {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.conjugation-section {
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(15, 23, 42, 0.10);
    border-radius: 20px;
    box-shadow: 0 18px 38px rgba(15, 23, 42, 0.08);
    overflow: hidden;
}
.conjugation-section--group {
    border-left: 5px solid #0f766e;
}
.conjugation-section--entry {
    border-left: 5px solid #1d4ed8;
}
.conjugation-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.conjugation-group__header {
    padding: 0.2rem 0.1rem 0;
}
.conjugation-group__eyebrow {
    margin: 0 0 0.35rem;
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #0f766e;
}
.conjugation-group__title {
    margin: 0;
    font-size: clamp(1.45rem, 2vw, 1.85rem);
    font-weight: 900;
    line-height: 1.1;
    color: #0f172a;
}
.conjugation-group__description {
    margin: 0.55rem 0 0;
    color: #475569;
}
.conjugation-section__summary {
    list-style: none;
    cursor: pointer;
}
.conjugation-section__summary::-webkit-details-marker {
    display: none;
}
.conjugation-section__summary {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.1rem 1.2rem;
}
.conjugation-section__summary-copy {
    min-width: 0;
}
.conjugation-section__eyebrow {
    display: inline-block;
    margin-bottom: 0.4rem;
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #64748b;
}
.conjugation-section__title {
    margin: 0;
    font-size: 1.08rem;
    color: #0f172a;
}
.conjugation-section__description {
    margin: 0.45rem 0 0;
    color: #475569;
}
.conjugation-section__summary-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}
.conjugation-section__chip {
    display: inline-flex;
    align-items: center;
    padding: 0.35rem 0.65rem;
    border-radius: 999px;
    background: #eff6ff;
    color: #1d4ed8;
    font-size: 0.8rem;
    font-weight: 700;
}
.conjugation-section__caret {
    width: 32px;
    height: 32px;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #eef2ff;
    color: #334155;
    transition: transform 0.2s ease;
}
.conjugation-section[open] > .conjugation-section__summary .conjugation-section__caret {
    transform: rotate(180deg);
}
.conjugation-section__panel {
    padding: 0 1.2rem 1.2rem;
}
.conjugation-block {
    border: 1px solid rgba(15, 23, 42, 0.10);
    border-radius: 16px;
    background: #f8fafc;
    overflow: hidden;
}
.conjugation-block__panel {
    padding: 1rem;
}
.conjugation-block__title {
    margin: 0 0 0.85rem;
    font-size: 1rem;
    font-weight: 800;
    color: #0f172a;
}
.conjugation-block-note {
    margin: 0;
}
.conjugation-block-warning {
    margin: 0;
}
.conjugation-richcontent {
    color: #334155;
}
.conjugation-richcontent__paragraph {
    margin: 0 0 0.8rem;
    line-height: 1.75;
}
.conjugation-richcontent__paragraph:last-child {
    margin-bottom: 0;
}
.conjugation-richcontent__list {
    margin: 0 0 0.9rem 1.1rem;
    padding-left: 1rem;
}
.conjugation-richcontent__list:last-child {
    margin-bottom: 0;
}
.conjugation-richcontent__list-item {
    margin-bottom: 0.55rem;
    line-height: 1.75;
}
.conjugation-richcontent__list-item:last-child {
    margin-bottom: 0;
}
.conjugation-richcontent__paragraph--accent,
.conjugation-richcontent__list-item--accent {
    color: #dc2626;
    font-weight: 800;
}
.conjugation-richcontent__paragraph--emphasis,
.conjugation-richcontent__list-item--emphasis {
    color: #0f172a;
    font-weight: 700;
}
.conjugation-richcontent__paragraph--warning,
.conjugation-richcontent__list-item--warning {
    color: #b91c1c;
    font-weight: 800;
}
.conjugation-richtext {
    padding: 0.15rem 0.1rem;
    color: #334155;
}
.conjugation-richtext__title {
    margin: 0 0 0.75rem;
    font-size: 1rem;
    color: #0f172a;
}
.lesson-steps {
    list-style: none;
    padding: 0;
    margin: 0;
    position: relative;
}

.lesson-step {
    display: grid;
    grid-template-columns: 30px 1fr;
    gap: 10px;
    align-items: start;
    position: relative;
    padding: 6px 0;
}

/* ligne verticale (timeline) */
.lesson-step::before {
    content: "";
    position: absolute;
    left: 14px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--line);
}
.lesson-step:first-child::before {
    top: 20px;
}
.lesson-step:last-child::before {
    bottom: 20px;
}

.lesson-step__dot {
    width: 28px;
    height: 28px;
    border-radius: 999px;
    display: grid;
    place-items: center;
    background: var(--soft);
    color: var(--muted);
    font: 700 12px/1 "Montserrat", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    border: 1px solid rgba(16, 24, 40, 0.08);
    position: relative;
    z-index: 1;
}

.lesson-step__card {
    background: var(--panel);
    border: 1px solid rgba(16, 24, 40, 0.08);
    border-radius: 16px;
    padding: 12px 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    color: var(--ink);
    text-decoration: none;
    transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease;
}

.lesson-step__card:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 18px rgba(16, 24, 40, 0.10);
    border-color: rgba(47, 107, 255, 0.25);
}

.lesson-step__text {
    display: flex;
    flex-direction: column;
    gap: 3px;
    min-width: 0;
}
.lesson-step__kicker {
    font: 700 12px/1.1 "Montserrat", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    color: rgba(16, 24, 40, 0.70);
}
.lesson-step__name {
    font: 700 14px/1.2 "Montserrat", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    color: var(--ink);
    white-space: normal;
    word-break: break-word;
}

/* Badge (DRAFT, etc.) */
.lesson-badge {
    flex: 0 0 auto;
    font: 800 11px/1 "Montserrat", system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    padding: 6px 10px;
    border-radius: 999px;
    letter-spacing: 0.04em;
}
.lesson-badge.is-draft {
    color: var(--badge);
    background: rgba(47, 107, 255, 0.10);
    border: 1px solid rgba(47, 107, 255, 0.25);
}

/* état actif */
.lesson-step.is-active .lesson-step__dot {
    background: rgba(11, 18, 32, 0.12);
    color: rgba(11, 18, 32, 0.85);
    border-color: rgba(11, 18, 32, 0.18);
}

.lesson-step.is-active .lesson-step__card {
    background: var(--active);
    border-color: rgba(255, 255, 255, 0.08);
    box-shadow: 0 16px 30px rgba(11, 18, 32, 0.25);
}

.lesson-step.is-active .lesson-step__kicker,
.lesson-step.is-active .lesson-step__name {
    color: var(--activeText);
}

.lesson-step.is-active .lesson-badge.is-draft {
    color: #a9c2ff;
    background: rgba(47, 107, 255, 0.16);
    border-color: rgba(169, 194, 255, 0.25);
}

.course-lesson-main {
    flex: 1;
    min-width: 0;
}
.course-lesson {
    background: #fff;
    border-radius: 18px;
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.12);
    padding: 1.8rem 1.6rem 2rem;
    margin-bottom: 2rem;
    border: 1px solid rgba(209, 213, 219, 0.7);
    scroll-margin-top: 110px;
}
.course-lesson-header h2 {
    color: #111827;
    border-bottom: 1px solid rgba(209, 213, 219, 0.9);
    padding-bottom: 0.55rem;
    margin-bottom: 0.5rem;
    font-size: 1.55rem;
    letter-spacing: -0.02em;
}
.course-lesson-subtitle {
    font-size: 0.95rem;
    color: #6b7280;
    margin-bottom: 0.8rem;
}
.course-lesson-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem 1rem;
    font-size: 0.9rem;
    color: #6b7280;
}
.course-lesson-meta__item i {
    color: var(--blue);
    margin-right: 0.35rem;
}
.course-lesson-content {
    margin-top: 1.4rem;
}

.course-lesson--questions {
    border-style: dashed;
}

.course-question-form {
    background: #f8fafc;
    border: 1px solid #e5e7eb;
    border-radius: 14px;
    padding: 1rem;
    margin-bottom: 0;
}

.course-question-search__bar {
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    gap: 0.5rem;
}

.course-question-search__input.form-control {
    flex: 1;
    min-width: 0;
    max-width: 100%;
    height: 2.5rem;
    padding: 0.5rem 0.85rem;
    font-size: 0.9375rem;
    border: 2px solid #94a3b8 !important;
    border-radius: 10px;
    background-color: #e2e8f0 !important;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

.course-question-search__input.form-control::placeholder {
    color: #64748b;
}

.course-question-search__input.form-control:focus {
    border-color: var(--accent) !important;
    background-color: #fff !important;
    box-shadow: 0 0 0 3px rgba(0, 71, 160, 0.15);
    outline: none;
}

.course-question-search__actions {
    display: flex;
    flex-wrap: wrap;
    align-items: stretch;
    gap: 0.35rem;
}

.course-question-search__btn {
    height: 2.5rem;
    padding: 0 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    white-space: nowrap;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    text-decoration: none;
    transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.course-question-search__btn.btn-primary {
    border: 1px solid var(--accent);
    background: var(--accent);
    color: #fff;
}

.course-question-search__btn.btn-primary:hover {
    border-color: #003a82;
    background: #003a82;
    color: #fff;
}

.course-question-search__btn.btn-outline-secondary {
    border: 1px solid rgba(0, 0, 0, 0.15);
    color: #4b5563;
}

.course-question-search__btn.btn-outline-secondary:hover {
    background: #f3f4f6;
    border-color: rgba(0, 0, 0, 0.2);
    color: #1f2937;
}

.course-question-results {
    margin-top: 0.4rem;
}

.course-question-list {
    display: grid;
    gap: 1.75rem;
}

.course-question-item {
    border: 1px solid #e2e8f0;
    border-radius: 16px;
    padding: 1.25rem 1.35rem;
    background: #ffffff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.course-question-item__head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 0.85rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid #eef2f7;
}

.course-question-item__author {
    font-weight: 700;
    color: #111827;
}

.course-question-item__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 0.5rem;
    align-items: center;
}

.course-question-item__question {
    margin: 0;
    color: #1f2937;
    line-height: 1.65;
}

.course-question-item__question-block {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 0.85rem 1rem;
    margin-bottom: 0.85rem;
}

.course-question-item__label {
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    color: #4b5563;
    margin-bottom: 0.35rem;
}

.course-question-item__answer {
    background: #f8fafc;
    border-left: 4px solid var(--accent);
    border-radius: 12px;
    margin-top: 0.5rem;
    padding: 0.9rem 1rem;
    color: #111827;
}

.course-question-item__answer-body {
    border-top: 1px solid #e0e7ff;
    margin-top: 0.5rem;
    padding-top: 0.6rem;
}

.course-question-item__answer-complement {
    margin-top: 1rem;
    padding: 0.75rem 0.9rem;
    background: rgba(255, 255, 255, 0.7);
    border-radius: 10px;
    border-left: 3px solid #94a3b8;
}

.course-question-item__answer-complement-label {
    display: block;
    font-weight: 800;
    color: #1e293b;
    margin-bottom: 0.35rem;
}

.course-question-item__answer-complement-body {
    color: #334155;
    line-height: 1.6;
}

.course-question-item__answer-credit {
    font-size: 0.83rem;
    color: #475569;
    margin-top: 0.1rem;
    margin-bottom: 0.3rem;
}

.course-question-proposal-form {
    background: #f8fafc;
    border: 1px solid #dbeafe;
    border-radius: 10px;
    padding: 0.7rem;
}

.course-question-proposal-submit {
    font-weight: 700;
    padding: 0.38rem 0.95rem;
    border-color: #198754;
    background: #198754;
    color: #ffffff;
}

.course-question-proposal-submit:hover,
.course-question-proposal-submit:focus {
    border-color: #157347;
    background: #157347;
    color: #ffffff;
}

.course-question-ask-toggle {
    border-radius: 999px;
    padding-inline: 1rem;
    font-weight: 700;
}

.course-question-ask .collapse.show {
    animation: questionAskReveal 0.2s ease-out;
}

@keyframes questionAskReveal {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.unit-question-admin-filters {
    display: inline-flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    background: linear-gradient(180deg, #f8f9ff 0%, #eef2ff 100%);
    border: 1px solid #dbe3ff;
    border-radius: 999px;
    padding: 0.35rem;
}

.unit-question-admin-filter {
    color: #1d4ed8;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.88rem;
    border-radius: 999px;
    padding: 0.4rem 0.8rem;
    border: 1px solid transparent;
    transition: all 0.14s ease;
}

.unit-question-admin-filter:hover {
    background: #ffffff;
    border-color: #bfdbfe;
    color: #1d4ed8;
}

.unit-question-admin-filter.is-active {
    background: linear-gradient(135deg, #1d4ed8 0%, #3b82f6 100%);
    border-color: #2563eb;
    color: #ffffff;
    box-shadow: 0 8px 16px rgba(37, 99, 235, 0.25);
}