/* --- Barre de saut rapide entre groupes (ex. conjugaison 1er/2e/3e groupe) --- */
.conj-group-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  position: sticky;
  top: 65px;
  z-index: 40;
  background: var(--school-surface);
  backdrop-filter: var(--school-glass-blur);
  -webkit-backdrop-filter: var(--school-glass-blur);
  padding: 12px 18px;
  margin: -10px 0 24px 0;
  border-radius: var(--school-radius-md);
  border: 1px solid var(--school-border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.conj-group-btn {
  padding: 7px 16px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--school-radius-pill);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.conj-group-btn:hover,
.conj-group-btn.active {
  background: var(--school-primary);
  color: #fff !important;
  border-color: var(--school-primary);
  box-shadow: 0 2px 8px rgba(14, 165, 233, 0.3);
}

h2[id^="conj-group-"] {
  scroll-margin-top: 150px;
}

.lesson-toc {
  background: var(--school-surface-alt, #f5f7fb);
  border-radius: var(--school-radius-md);
  padding: 14px 18px;
}

.lesson-toc ul {
  margin: 6px 0 0;
  padding-left: 20px;
}

/* --- Navigation "livre" des cours façon Google Play Livres --- */
.lesson-book-layout {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  position: relative;
}

.lesson-sidebar {
  flex: 0 0 250px;
  min-width: 0;
  position: sticky;
  top: 16px;
  max-height: calc(100vh - 32px);
  overflow-y: auto;
  background: var(--school-surface);
  border: 1px solid var(--school-border);
  border-radius: var(--school-radius-md);
  padding: 16px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.03);
}

.lesson-sidebar-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  color: var(--school-primary-dark);
  text-transform: uppercase;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--school-primary-soft);
}

.lesson-chapter + .lesson-chapter {
  margin-top: 16px;
}

.lesson-chapter-title {
  font-weight: 700;
  color: var(--school-text);
  font-size: 13.5px;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.lesson-chapter-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.lesson-chapter-list li {
  margin: 3px 0;
}

.lesson-nav-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  border-radius: 8px;
  color: var(--school-text-muted);
  text-decoration: none;
  font-size: 13px;
  line-height: 1.35;
  transition: all 0.15s ease;
}

.lesson-nav-link:hover {
  background: var(--school-surface-alt, #f1f5f9);
  color: var(--school-primary);
  transform: translateX(2px);
}

.lesson-nav-link.active {
  background: var(--school-primary-soft);
  color: var(--school-primary-dark);
  font-weight: 700;
  border-left: 3px solid var(--school-primary);
}

/* Zone du livre StPageFlip (Livre physique & tourne-page réaliste) */
.lesson-page-container {
  flex: 1;
  min-width: 0;
  position: relative;
  display: flex;
  flex-direction: column;
}

.lesson-flip-book-wrapper {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  margin: 0 auto;
  min-height: 760px;
  position: relative;
  background: rgba(0, 0, 0, 0.02);
  border-radius: var(--school-radius-lg, 16px);
  padding: 12px 0;
}

.lesson-flip-book {
  width: 100%;
  max-width: 920px;
  min-height: 760px;
  margin: 0 auto;
}

/* Page individuelle du livre StPageFlip */
.lesson-flip-page {
  background-color: var(--school-card-bg, #ffffff);
  color: var(--school-text);
  border: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 
    -2px 0 6px rgba(0, 0, 0, 0.04),
    2px 2px 0 #f1f5f9,
    4px 4px 16px rgba(15, 23, 42, 0.08);
  box-sizing: border-box;
  height: 100%;
  overflow-y: auto !important;
  overflow-x: hidden !important;
  display: flex;
  flex-direction: column;
  border-radius: 4px 12px 12px 4px;
  user-select: text !important;
  -webkit-user-select: text !important;
}

.lesson-flip-page::-webkit-scrollbar {
  width: 6px;
}

.lesson-flip-page::-webkit-scrollbar-thumb {
  background: var(--school-border);
  border-radius: 9999px;
}

.lesson-flip-page-inner {
  padding: 28px 32px 36px;
  min-height: 100%;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
  /* Ombre subtile de pliure de la reliure intérieure */
  background-image: linear-gradient(to right, rgba(0, 0, 0, 0.05) 0px, rgba(0, 0, 0, 0.01) 16px, transparent 36px);
  font-size: var(--lesson-font-size, 16px);
  user-select: text !important;
  -webkit-user-select: text !important;
}

.lesson-sheet-body,
.lesson-sheet-title,
.lesson-flip-page p,
.lesson-flip-page li,
.lesson-flip-page span,
.lesson-flip-page strong,
.lesson-flip-page em,
.lesson-flip-page code,
.lesson-flip-page div {
  user-select: text !important;
  -webkit-user-select: text !important;
}

.lesson-flip-page.paper-sepia,
.lesson-flip-page.paper-sepia .lesson-flip-page-inner {
  background-color: #fcf6e8 !important;
  color: #433422 !important;
}

.lesson-flip-page.paper-oled,
.lesson-flip-page.paper-oled .lesson-flip-page-inner {
  background-color: #0b0f19 !important;
  color: #e2e8f0 !important;
}

/* Encart élégant « Cliquer ici » pour tourner la page au clic */
.book-corner-encart {
  position: absolute;
  top: 14px;
  z-index: 50;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 9999px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  border: 1.5px solid var(--school-primary, #14b8a6);
  background: var(--school-surface, #ffffff);
  color: var(--school-primary-dark, #0f766e);
  box-shadow: 0 3px 10px rgba(20, 184, 166, 0.18), 0 1px 3px rgba(0, 0, 0, 0.06);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none !important;
  -webkit-user-select: none !important;
  line-height: 1.2;
}

.book-corner-encart.book-corner-right {
  right: 14px;
}

.book-corner-encart.book-corner-left {
  left: 14px;
}

.book-corner-encart:hover {
  background: var(--school-primary, #14b8a6);
  color: #ffffff;
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 6px 16px rgba(20, 184, 166, 0.35);
}

.book-corner-encart:active {
  transform: translateY(0) scale(0.98);
}

/* En mode double page (landscape), masquer les encarts intérieurs (qui pointent vers la pliure centrale) */
.stf__wrapper.--landscape .stf__item.--left .book-corner-right,
.stf__wrapper.--landscape .stf__item.--right .book-corner-left {
  display: none !important;
}

/* Thème Sépia pour les encarts */
.lesson-flip-page.paper-sepia .book-corner-encart {
  background: #fcf6e8 !important;
  border-color: #b45309 !important;
  color: #78350f !important;
  box-shadow: 0 3px 8px rgba(180, 83, 9, 0.15) !important;
}
.lesson-flip-page.paper-sepia .book-corner-encart:hover {
  background: #b45309 !important;
  color: #ffffff !important;
}

/* Thème Sombre OLED pour les encarts */
.lesson-flip-page.paper-oled .book-corner-encart {
  background: #1e293b !important;
  border-color: #38bdf8 !important;
  color: #38bdf8 !important;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.4) !important;
}
.lesson-flip-page.paper-oled .book-corner-encart:hover {
  background: #38bdf8 !important;
  color: #0f172a !important;
}

/* Barre supérieure du livre (progression & pagination rapide) */
.lesson-book-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 16px;
  margin-bottom: 24px;
  border-bottom: 1px dashed var(--school-border);
}

.lesson-sheet-check-btn {
  border: 1px solid var(--school-border);
  background: var(--school-surface);
  color: var(--school-text-muted, #64748b);
  border-radius: 9999px;
  padding: 3px 10px;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.lesson-sheet-check-btn:hover {
  border-color: var(--school-primary);
  color: var(--school-primary-dark);
  background: var(--school-primary-soft);
}

.lesson-sheet-check-btn.is-done {
  background: #10b981 !important;
  color: #ffffff !important;
  border-color: #059669 !important;
  box-shadow: 0 2px 6px rgba(16, 185, 129, 0.25);
}

.lesson-book-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--school-text-muted);
}

.lesson-book-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 9999px;
  background: var(--school-surface-alt, #f1f5f9);
  font-weight: 600;
  font-size: 12px;
}

.lesson-book-quick-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.lesson-book-quick-btn {
  border: 1px solid var(--school-border);
  background: var(--school-surface);
  color: var(--school-text);
  border-radius: 8px;
  padding: 4px 10px;
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 0.15s ease;
}

.lesson-book-quick-btn:hover:not(:disabled) {
  background: var(--school-primary-soft);
  color: var(--school-primary-dark);
  border-color: var(--school-primary);
  transform: translateY(-1px);
}

.lesson-book-quick-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}