/* ============================================================
   main.css v2 — Design System Avancé
   Tokens → Reset → Typo → Layout → Nav → Boutons → Cards →
   Forms → Sidebar → Stats → Progress → Tabs → Quiz → Doc →
   Tree → RTE → DragDrop → Callout → Modal → Table →
   Homepage → Footer → Builder → Course → Utilitaires
   ============================================================ */

/* ══════════════════════════════════════════════
   1. DESIGN TOKENS
══════════════════════════════════════════════ */
:root {
  /* Couleurs principales */
  --c-primary:        #3B82F6;   /* blue-500 */
  --c-primary-hov:    #2563EB;   /* blue-600 */
  --c-primary-light:  #EFF6FF;   /* blue-50 */
  --c-primary-mid:    #BFDBFE;   /* blue-200 */

  /* Rôles */
  --c-admin:         #8B5CF6;   /* violet-500 */
  --c-admin-light:   #F5F3FF;
  --c-formateur:     #0EA5E9;   /* sky-500 */
  --c-formateur-light:#F0F9FF;
  --c-learner:       #10B981;   /* emerald-500 */
  --c-learner-light: #ECFDF5;

  /* États */
  --c-success:  #10B981;
  --c-danger:   #EF4444;
  --c-warning:  #F59E0B;
  --c-info:     #3B82F6;
  --c-accent:   #F59E0B;

  /* Gris (palette Slate) */
  --c-bg:       #F1F5F9;
  --c-white:    #FFFFFF;
  --c-gray-50:  #F8FAFC;
  --c-gray-100: #F1F5F9;
  --c-gray-200: #E2E8F0;
  --c-gray-300: #CBD5E1;
  --c-gray-400: #94A3B8;
  --c-gray-500: #64748B;
  --c-gray-600: #475569;
  --c-gray-700: #334155;
  --c-gray-800: #1E293B;
  --c-gray-900: #0F172A;

  /* Typographie */
  --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Consolas','JetBrains Mono','Monaco',monospace;

  /* Rayons */
  --r-xs:  4px;
  --r-sm:  6px;
  --r:     10px;
  --r-lg:  14px;
  --r-xl:  20px;
  --r-full:9999px;

  /* Ombres */
  --s-xs: 0 1px 2px rgba(0,0,0,.05);
  --s-sm: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --s:    0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.04);
  --s-lg: 0 10px 25px rgba(0,0,0,.10), 0 4px 10px rgba(0,0,0,.06);
  --s-xl: 0 20px 40px rgba(0,0,0,.12), 0 8px 16px rgba(0,0,0,.06);

  /* Layout */
  --nav-h:    68px;
  --sidebar-w:264px;
  --t:        .18s ease;
}

/* ══════════════════════════════════════════════
   2. RESET
══════════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--c-gray-900); background: var(--c-bg); line-height: 1.6; font-size: 15px; -webkit-font-smoothing: antialiased; }
a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; font-family: var(--font); }
input, textarea, select { font-family: var(--font); }
ul { list-style: none; }
code { font-family: var(--font-mono); background: var(--c-gray-100); border: 1px solid var(--c-gray-200); padding: 2px 6px; border-radius: var(--r-xs); font-size: .82em; color: #BE185D; }
pre { background: var(--c-gray-900); color: #E2E8F0; padding: 1.25rem; border-radius: var(--r); overflow-x: auto; font-family: var(--font-mono); font-size: .875rem; line-height: 1.6; }
pre code { background: none; border: none; padding: 0; color: inherit; font-size: 1em; }
hr { border: none; border-top: 1px solid var(--c-gray-200); margin: 1.5rem 0; }

/* ══════════════════════════════════════════════
   3. TYPOGRAPHIE
══════════════════════════════════════════════ */
h1 { font-size: 2.5rem; font-weight: 800; line-height: 1.15; letter-spacing: -.02em; }
h2 { font-size: 1.875rem; font-weight: 700; letter-spacing: -.01em; }
h3 { font-size: 1.25rem; font-weight: 600; }
h4 { font-size: 1rem; font-weight: 600; }
.text-xs   { font-size: .75rem; }
.text-sm   { font-size: .875rem; }
.text-lg   { font-size: 1.125rem; }
.text-muted{ color: var(--c-gray-500); }
.text-center { text-align: center; }
.font-bold { font-weight: 700; }
.font-semi { font-weight: 600; }

/* ══════════════════════════════════════════════
   4. LAYOUT
══════════════════════════════════════════════ */
.container    { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.container-sm { max-width: 760px;  margin: 0 auto; padding: 0 1.5rem; }
.flex         { display: flex; }
.flex-col     { display: flex; flex-direction: column; }
.flex-center  { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.items-center { align-items: center; }
.gap-1 { gap: .5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }
.grid-2 { display: grid; grid-template-columns: repeat(2,1fr); gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4,1fr); gap: 1.5rem; }
@media(max-width:900px){ .grid-3,.grid-4 { grid-template-columns: repeat(2,1fr); } }
@media(max-width:600px){ .grid-2,.grid-3,.grid-4 { grid-template-columns:1fr; } h1{font-size:1.875rem;} }

/* ══════════════════════════════════════════════
   5. NAVIGATION
══════════════════════════════════════════════ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; height: var(--nav-h);
  background: rgba(255,255,255,.95); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-gray-200); display: flex;
  align-items: center; z-index: 100; box-shadow: var(--s-sm);
}
.nav__inner   { width:100%; max-width:1200px; margin:0 auto; padding:0 1.5rem; display:flex; align-items:center; justify-content:space-between; }
.nav__logo    { font-size:1.375rem; font-weight:800; color:var(--c-gray-900); display:flex; align-items:center; gap:.5rem; letter-spacing:-.02em; }
.nav__logo em { color:var(--c-primary); font-style:normal; }
.nav__logo span{ color:var(--c-accent); }
.nav__links   { display:flex; align-items:center; gap:1.5rem; }
.nav__link    { color:var(--c-gray-600); font-weight:500; font-size:.9rem; transition:color var(--t); }
.nav__link:hover{ color:var(--c-primary); text-decoration:none; }
.nav__actions { display:flex; align-items:center; gap:.625rem; }

/* ══════════════════════════════════════════════
   6. BOUTONS
══════════════════════════════════════════════ */
.btn {
  display:inline-flex; align-items:center; gap:.5rem;
  padding:.625rem 1.25rem; border-radius:var(--r-sm);
  font-size:.875rem; font-weight:600; transition:var(--t);
  border:2px solid transparent; white-space:nowrap; line-height:1.4;
}
.btn:hover { text-decoration:none; transform:translateY(-1px); }
.btn:active { transform:translateY(0); }
.btn--primary { background:var(--c-primary); color:#fff; box-shadow:0 2px 8px rgba(59,130,246,.3); }
.btn--primary:hover { background:var(--c-primary-hov); box-shadow:0 4px 12px rgba(59,130,246,.4); }
.btn--outline { border-color:var(--c-primary); color:var(--c-primary); background:transparent; }
.btn--outline:hover { background:var(--c-primary-light); }
.btn--ghost  { color:var(--c-gray-600); background:transparent; }
.btn--ghost:hover { background:var(--c-gray-100); }
.btn--danger { background:var(--c-danger); color:#fff; }
.btn--danger:hover { background:#DC2626; }
.btn--success{ background:var(--c-success); color:#fff; }
.btn--warning{ background:var(--c-warning); color:#fff; }
.btn--dark   { background:var(--c-gray-800); color:#fff; }
.btn--formateur { background:var(--c-formateur); color:#fff; }
.btn--sm  { padding:.375rem .875rem; font-size:.8rem; }
.btn--lg  { padding:.875rem 1.75rem; font-size:1rem; }
.btn--xl  { padding:1.125rem 2.25rem; font-size:1.1rem; }
.btn--icon{ padding:.5rem; border-radius:var(--r-sm); }
.btn--round{ border-radius:var(--r-full); }
.btn[disabled]{ opacity:.45; cursor:not-allowed; pointer-events:none; transform:none !important; }

/* ══════════════════════════════════════════════
   7. CARTES
══════════════════════════════════════════════ */
.card  { background:var(--c-white); border-radius:var(--r-lg); box-shadow:var(--s-sm); border:1px solid var(--c-gray-200); overflow:hidden; }
.card__body   { padding:1.5rem; }
.card__header { padding:1.125rem 1.5rem; border-bottom:1px solid var(--c-gray-200); display:flex; align-items:center; justify-content:space-between; }
.card__footer { padding:1rem 1.5rem; border-top:1px solid var(--c-gray-200); background:var(--c-gray-50); }

/* Course card */
.course-card { background:var(--c-white); border-radius:var(--r-xl); box-shadow:var(--s-sm); border:1px solid var(--c-gray-200); overflow:hidden; transition:transform var(--t), box-shadow var(--t); }
.course-card:hover { transform:translateY(-5px); box-shadow:var(--s-lg); }
.course-card__thumb { height:168px; display:flex; align-items:center; justify-content:center; font-size:3.25rem; position:relative; }
.course-card__thumb::after { content:''; position:absolute; inset:0; background:linear-gradient(to top, rgba(0,0,0,.35) 0%, transparent 60%); }
.course-card__level { position:absolute; bottom:12px; right:12px; z-index:1; }
.course-card__body  { padding:1.25rem; }
.course-card__cat   { font-size:.72rem; font-weight:700; text-transform:uppercase; letter-spacing:.08em; color:var(--c-primary); margin-bottom:.5rem; }
.course-card__title { font-size:1rem; font-weight:700; margin-bottom:.5rem; color:var(--c-gray-900); line-height:1.3; }
.course-card__desc  { font-size:.84rem; color:var(--c-gray-500); margin-bottom:1rem; display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden; }
.course-card__meta  { display:flex; align-items:center; justify-content:space-between; font-size:.8rem; color:var(--c-gray-500); }

/* ══════════════════════════════════════════════
   8. BADGES
══════════════════════════════════════════════ */
.badge           { display:inline-flex; align-items:center; gap:.3rem; padding:.2rem .7rem; border-radius:var(--r-full); font-size:.72rem; font-weight:700; letter-spacing:.02em; }
.badge--published{ background:#DCFCE7; color:#15803D; }
.badge--draft    { background:var(--c-gray-100); color:var(--c-gray-600); border:1px solid var(--c-gray-200); }
.badge--primary  { background:var(--c-primary-light); color:var(--c-primary); }
.badge--admin    { background:var(--c-admin-light); color:var(--c-admin); }
.badge--formateur{ background:var(--c-formateur-light); color:var(--c-formateur); }
.badge--learner  { background:var(--c-learner-light); color:var(--c-learner); }
.badge--beginner    { background:#DCFCE7; color:#15803D; }
.badge--intermediate{ background:#FEF9C3; color:#A16207; }
.badge--advanced    { background:#FEE2E2; color:#B91C1C; }

/* ══════════════════════════════════════════════
   9. FORMULAIRES
══════════════════════════════════════════════ */
.form-group   { margin-bottom:1.25rem; }
.form-label   { display:block; font-size:.8rem; font-weight:700; color:var(--c-gray-600); margin-bottom:.375rem; text-transform:uppercase; letter-spacing:.04em; }
.form-hint    { font-size:.75rem; color:var(--c-gray-400); margin-top:.3rem; font-weight:400; text-transform:none; letter-spacing:0; }
.form-input, .form-textarea, .form-select {
  width:100%; padding:.625rem 1rem;
  border:2px solid var(--c-gray-200); border-radius:var(--r-sm);
  font-size:.9rem; color:var(--c-gray-900); background:var(--c-white);
  transition:border-color var(--t), box-shadow var(--t);
}
.form-input:focus, .form-textarea:focus, .form-select:focus {
  outline:none; border-color:var(--c-primary);
  box-shadow:0 0 0 3px rgba(59,130,246,.12);
}
.form-textarea { resize:vertical; min-height:100px; line-height:1.6; }
.form-row { display:grid; grid-template-columns:1fr 1fr; gap:1rem; }
.form-row-3 { display:grid; grid-template-columns:1fr 1fr 1fr; gap:1rem; }
@media(max-width:600px){ .form-row,.form-row-3 { grid-template-columns:1fr; } }

/* ══════════════════════════════════════════════
   10. SIDEBAR DASHBOARD
══════════════════════════════════════════════ */
.app-layout   { display:flex; min-height:100vh; padding-top:var(--nav-h); }
.sidebar {
  width:var(--sidebar-w); flex-shrink:0;
  background:var(--c-gray-900); color:#fff;
  position:fixed; top:var(--nav-h); left:0; bottom:0;
  overflow-y:auto; z-index:50; display:flex; flex-direction:column;
  border-right:1px solid rgba(255,255,255,.05);
}
.sidebar__brand { padding:1.5rem 1.25rem; border-bottom:1px solid rgba(255,255,255,.08); }
.sidebar__brand-name { font-weight:800; font-size:1rem; letter-spacing:-.01em; }
.sidebar__brand-role { display:block; font-size:.72rem; opacity:.5; margin-top:.25rem; }
.sidebar__brand-user { display:flex; align-items:center; gap:.625rem; margin-top:1rem; }
.sidebar__brand-info { min-width:0; }
.sidebar__brand-email{ font-size:.72rem; opacity:.5; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.sidebar__section-title { padding:.625rem 1.25rem .375rem; font-size:.68rem; font-weight:700; text-transform:uppercase; letter-spacing:.1em; opacity:.4; }
.sidebar__nav a {
  display:flex; align-items:center; gap:.75rem;
  padding:.7rem 1.25rem; color:rgba(255,255,255,.65);
  font-size:.875rem; font-weight:500; transition:var(--t);
  border-left:3px solid transparent; margin:.1rem 0;
}
.sidebar__nav a:hover, .sidebar__nav a.active { color:#fff; background:rgba(255,255,255,.08); text-decoration:none; }
.sidebar__nav a.active { border-left-color:var(--c-primary); background:rgba(59,130,246,.15); color:#fff; }
.sidebar__icon { width:18px; text-align:center; flex-shrink:0; opacity:.7; }
.sidebar__footer { padding:1rem 1.25rem; border-top:1px solid rgba(255,255,255,.08); margin-top:auto; }
.main-content { margin-left:var(--sidebar-w); flex:1; padding:2rem; min-width:0; }
.page-header  { margin-bottom:2rem; }
.page-header h1 { font-size:1.625rem; font-weight:800; margin-bottom:.25rem; }

/* ══════════════════════════════════════════════
   11. STAT CARDS
══════════════════════════════════════════════ */
.stat-card { background:var(--c-white); border-radius:var(--r-lg); padding:1.5rem; border:1px solid var(--c-gray-200); box-shadow:var(--s-xs); position:relative; overflow:hidden; }
.stat-card::before { content:''; position:absolute; top:0; left:0; right:0; height:3px; background:var(--stat-color, var(--c-primary)); }
.stat-card__icon  { width:44px; height:44px; border-radius:var(--r); display:flex; align-items:center; justify-content:center; font-size:1.375rem; margin-bottom:1rem; background:var(--stat-bg, var(--c-primary-light)); }
.stat-card__value { font-size:2rem; font-weight:800; color:var(--c-gray-900); letter-spacing:-.03em; }
.stat-card__label { font-size:.8rem; color:var(--c-gray-500); margin-top:.25rem; font-weight:500; }
.stat-card__trend { font-size:.75rem; font-weight:600; margin-top:.5rem; }
.stat--blue   { --stat-color:var(--c-primary);    --stat-bg:var(--c-primary-light); }
.stat--green  { --stat-color:var(--c-success);    --stat-bg:#DCFCE7; }
.stat--amber  { --stat-color:var(--c-warning);    --stat-bg:#FEF9C3; }
.stat--purple { --stat-color:var(--c-admin);      --stat-bg:var(--c-admin-light); }
.stat--sky    { --stat-color:var(--c-formateur);  --stat-bg:var(--c-formateur-light); }

/* ══════════════════════════════════════════════
   12. PROGRESS
══════════════════════════════════════════════ */
.progress      { background:var(--c-gray-200); border-radius:var(--r-full); height:7px; overflow:hidden; }
.progress__bar { height:100%; background:var(--c-primary); border-radius:var(--r-full); transition:width .6s cubic-bezier(.4,0,.2,1); }
.progress--success .progress__bar { background:var(--c-success); }
.progress--amber  .progress__bar  { background:var(--c-warning); }
.progress-lg   { height:10px; }

/* ══════════════════════════════════════════════
   13. ONGLETS (navigation)
══════════════════════════════════════════════ */
.tabs     { border-bottom:2px solid var(--c-gray-200); display:flex; gap:0; margin-bottom:0; }
.tab-btn  { padding:.75rem 1.375rem; font-size:.875rem; font-weight:600; color:var(--c-gray-500); background:transparent; border:none; border-bottom:3px solid transparent; margin-bottom:-2px; transition:var(--t); cursor:pointer; }
.tab-btn:hover  { color:var(--c-gray-900); }
.tab-btn.active { color:var(--c-primary); border-bottom-color:var(--c-primary); }
.tab-panel       { display:none; }
.tab-panel.active{ display:block; }

/* ══════════════════════════════════════════════
   14. COMPOSANT ONGLETS CONTENU
══════════════════════════════════════════════ */
.content-tabs           { border:1px solid var(--c-gray-200); border-radius:var(--r-lg); overflow:hidden; margin-bottom:1.25rem; box-shadow:var(--s-xs); }
.content-tabs__header   { display:flex; flex-wrap:wrap; background:var(--c-gray-50); border-bottom:1px solid var(--c-gray-200); }
.content-tabs__btn      { padding:.625rem 1.125rem; font-size:.85rem; font-weight:600; background:transparent; border:none; cursor:pointer; color:var(--c-gray-500); border-bottom:3px solid transparent; transition:var(--t); }
.content-tabs__btn:hover { color:var(--c-gray-900); background:var(--c-gray-100); }
.content-tabs__btn.active{ color:var(--c-primary); background:var(--c-white); border-bottom-color:var(--c-primary); }
.content-tabs__panel     { padding:1.375rem; display:none; }
.content-tabs__panel.active{ display:block; }

/* ══════════════════════════════════════════════
   15. QUIZ
══════════════════════════════════════════════ */
.quiz            { border:1px solid var(--c-primary-mid); border-radius:var(--r-lg); padding:1.5rem; background:var(--c-primary-light); margin-bottom:1.25rem; }
.quiz__label     { font-size:.72rem; font-weight:700; text-transform:uppercase; letter-spacing:.08em; color:var(--c-primary); margin-bottom:.75rem; display:flex; align-items:center; gap:.5rem; }
.quiz__question  { font-weight:700; margin-bottom:1.25rem; font-size:1rem; color:var(--c-gray-900); line-height:1.5; }
.quiz__options   { display:flex; flex-direction:column; gap:.5rem; margin-bottom:1rem; }
.quiz__option    { padding:.75rem 1.125rem; border:2px solid var(--c-gray-200); border-radius:var(--r-sm); background:var(--c-white); cursor:pointer; transition:var(--t); text-align:left; font-size:.875rem; font-weight:500; }
.quiz__option:hover       { border-color:var(--c-primary); background:var(--c-primary-light); transform:translateX(3px); }
.quiz__option.selected    { border-color:var(--c-primary); background:var(--c-primary-light); }
.quiz__option.correct     { border-color:var(--c-success); background:#DCFCE7; color:#15803D; }
.quiz__option.incorrect   { border-color:var(--c-danger); background:#FEE2E2; color:#B91C1C; }
.quiz__option:disabled    { cursor:default; transform:none; }
.quiz__feedback           { padding:.75rem 1rem; border-radius:var(--r-sm); font-size:.875rem; margin-top:.625rem; font-weight:500; }
.quiz__feedback--correct  { background:#DCFCE7; color:#15803D; border:1px solid #86EFAC; }
.quiz__feedback--incorrect{ background:#FEE2E2; color:#B91C1C; border:1px solid #FCA5A5; }

/* ══════════════════════════════════════════════
   16. DOCUMENT
══════════════════════════════════════════════ */
.doc-element { display:flex; align-items:center; gap:1rem; padding:1rem 1.25rem; border:1px solid var(--c-gray-200); border-radius:var(--r-lg); background:var(--c-white); margin-bottom:1.25rem; box-shadow:var(--s-xs); transition:var(--t); }
.doc-element:hover { box-shadow:var(--s); border-color:var(--c-gray-300); }
.doc-element__icon { font-size:2rem; flex-shrink:0; }
.doc-element__info { flex:1; min-width:0; }
.doc-element__name { font-weight:700; font-size:.9rem; margin-bottom:.2rem; }
.doc-element__meta { font-size:.75rem; color:var(--c-gray-500); }

/* ══════════════════════════════════════════════
   17. CALLOUTS (encadrés)
══════════════════════════════════════════════ */
.callout { border-radius:var(--r); padding:1rem 1.25rem; border-left:4px solid; margin-bottom:1.25rem; }
.callout--info    { background:#EFF6FF; border-color:var(--c-primary); }
.callout--warning { background:#FFFBEB; border-color:var(--c-warning); }
.callout--success { background:#F0FDF4; border-color:var(--c-success); }
.callout--danger  { background:#FEF2F2; border-color:var(--c-danger); }
.callout--tip     { background:#F5F3FF; border-color:var(--c-admin); }
.callout__hdr     { display:flex; align-items:center; gap:.5rem; font-weight:700; font-size:.875rem; margin-bottom:.4rem; }
.callout__body    { font-size:.875rem; line-height:1.6; }

/* ══════════════════════════════════════════════
   18. ACCORDION
══════════════════════════════════════════════ */
.accordion        { border:1px solid var(--c-gray-200); border-radius:var(--r-lg); overflow:hidden; margin-bottom:1.25rem; }
.accordion__item  { border-bottom:1px solid var(--c-gray-200); }
.accordion__item:last-child { border-bottom:none; }
.accordion__toggle{ width:100%; display:flex; align-items:center; justify-content:space-between; padding:1rem 1.25rem; background:var(--c-white); cursor:pointer; font-weight:600; font-size:.9rem; transition:background var(--t); text-align:left; border:none; }
.accordion__toggle:hover { background:var(--c-gray-50); }
.accordion__arrow { transition:transform var(--t); font-size:.75rem; }
.accordion__item.open .accordion__arrow { transform:rotate(180deg); }
.accordion__body  { display:none; padding:1rem 1.25rem; background:var(--c-gray-50); font-size:.875rem; line-height:1.7; }
.accordion__item.open .accordion__body { display:block; }

/* ══════════════════════════════════════════════
   19. ARBRE (tree view — builder sidebar)
══════════════════════════════════════════════ */
.tree            { padding:.5rem; }
.tree-node       { margin-bottom:.15rem; }
.tree-node__row  { display:flex; align-items:center; gap:.4rem; padding:.45rem .5rem; border-radius:var(--r-sm); cursor:pointer; transition:background var(--t); user-select:none; }
.tree-node__row:hover { background:var(--c-gray-100); }
.tree-node.active > .tree-node__row { background:var(--c-primary-light); }
.tree-node.active > .tree-node__row .tree-node__label { color:var(--c-primary); font-weight:700; }
.tree-node__caret  { width:16px; flex-shrink:0; font-size:.65rem; color:var(--c-gray-400); transition:transform var(--t); line-height:1; }
.tree-node__caret.open { transform:rotate(90deg); }
.tree-node__icon   { flex-shrink:0; font-size:.9rem; }
.tree-node__label  { flex:1; font-size:.835rem; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; color:var(--c-gray-700); font-weight:500; }
.tree-node__count  { font-size:.7rem; color:var(--c-gray-400); background:var(--c-gray-100); padding:.1rem .45rem; border-radius:var(--r-full); flex-shrink:0; }
.tree-node__actions { display:none; gap:.2rem; flex-shrink:0; }
.tree-node__row:hover .tree-node__actions { display:flex; }
.tree-node__children { margin-left:1.1rem; padding-left:.625rem; border-left:2px solid var(--c-gray-200); display:none; }
.tree-node__children.open { display:block; }
/* Indentation par niveau */
.tree-unit   > .tree-node__row { }
.tree-module > .tree-node__row { }
.tree-chapter> .tree-node__row { }
.tree-chapter > .tree-node__row .tree-node__label { color:var(--c-gray-600); font-size:.8rem; }

/* ══════════════════════════════════════════════
   20. ÉDITEUR RICHE (RTE)
══════════════════════════════════════════════ */
.rte-wrap              { border:2px solid var(--c-gray-200); border-radius:var(--r); overflow:hidden; background:var(--c-white); }
.rte-wrap:focus-within { border-color:var(--c-primary); box-shadow:0 0 0 3px rgba(59,130,246,.12); }
.rte-toolbar { display:flex; flex-wrap:wrap; align-items:center; gap:.2rem; padding:.4rem .6rem; background:var(--c-gray-50); border-bottom:1px solid var(--c-gray-200); }
.rte-btn {
  width:30px; height:30px; display:flex; align-items:center; justify-content:center;
  border-radius:var(--r-xs); background:transparent; border:none; cursor:pointer;
  font-size:.82rem; font-weight:700; color:var(--c-gray-600); transition:var(--t);
  flex-shrink:0;
}
.rte-btn:hover  { background:var(--c-gray-200); color:var(--c-gray-900); }
.rte-btn.active { background:var(--c-primary-light); color:var(--c-primary); }
.rte-btn--wide  { width:auto; padding:0 .5rem; font-size:.75rem; font-weight:700; }
.rte-sep { width:1px; background:var(--c-gray-200); height:20px; margin:0 .15rem; flex-shrink:0; }
.rte-editor {
  padding:1rem 1.125rem; min-height:180px; outline:none;
  font-size:.9rem; line-height:1.75; color:var(--c-gray-800);
}
.rte-editor:empty::before { content:attr(data-placeholder); color:var(--c-gray-400); pointer-events:none; }
.rte-editor h2   { font-size:1.25rem; margin:1rem 0 .5rem; color:var(--c-gray-900); }
.rte-editor h3   { font-size:1.05rem; margin:.75rem 0 .375rem; color:var(--c-gray-900); }
.rte-editor p    { margin-bottom:.625rem; }
.rte-editor ul   { margin:.5rem 0 .625rem 1.5rem; list-style:disc; }
.rte-editor ol   { margin:.5rem 0 .625rem 1.5rem; list-style:decimal; }
.rte-editor li   { margin-bottom:.25rem; }
.rte-editor blockquote { border-left:4px solid var(--c-primary); padding:.5rem 1rem; color:var(--c-gray-600); margin:.75rem 0; font-style:italic; background:var(--c-primary-light); border-radius:0 var(--r-sm) var(--r-sm) 0; }
.rte-source      { display:none; padding:1rem; min-height:180px; font-family:var(--font-mono); font-size:.8rem; border:none; outline:none; resize:vertical; width:100%; background:var(--c-gray-900); color:#E2E8F0; }
.rte-source.active { display:block; }
.rte-editor.hidden { display:none; }

/* ══════════════════════════════════════════════
   21. DRAG & DROP
══════════════════════════════════════════════ */
.drag-handle { cursor:grab; color:var(--c-gray-300); padding:.25rem .375rem; font-size:1rem; user-select:none; transition:color var(--t); flex-shrink:0; }
.drag-handle:hover  { color:var(--c-gray-500); }
.drag-handle:active { cursor:grabbing; }
.element-block      { border:2px solid var(--c-gray-200); border-radius:var(--r-lg); margin-bottom:.875rem; overflow:hidden; background:var(--c-white); transition:transform .15s, box-shadow .15s, border-color .15s; }
.element-block.dragging    { opacity:.45; transform:scale(.98); box-shadow:none; }
.element-block.drag-over   { border-color:var(--c-primary); box-shadow:0 0 0 3px rgba(59,130,246,.15); }
.element-block__hdr  { padding:.6rem .875rem; display:flex; align-items:center; gap:.5rem; background:var(--c-gray-50); border-bottom:1px solid var(--c-gray-200); }
.element-block__type { font-size:.72rem; font-weight:800; text-transform:uppercase; letter-spacing:.07em; color:var(--c-gray-500); flex:1; }
.element-block__body { padding:1rem; }
.element-block--text    .element-block__hdr { border-left:3px solid #3B82F6; }
.element-block--tabs    .element-block__hdr { border-left:3px solid #8B5CF6; }
.element-block--quiz    .element-block__hdr { border-left:3px solid #10B981; }
.element-block--document.element-block__hdr { border-left:3px solid #F59E0B; }
.element-block--callout .element-block__hdr { border-left:3px solid #EC4899; }
.element-block--video   .element-block__hdr { border-left:3px solid #EF4444; }
.element-block--accordion.element-block__hdr{ border-left:3px solid #06B6D4; }
.drop-indicator { height:3px; background:var(--c-primary); border-radius:2px; margin:.3rem 0; display:none; }
.drop-indicator.visible { display:block; }

/* ══════════════════════════════════════════════
   22. ALERTES & TOASTS
══════════════════════════════════════════════ */
.alert           { padding:.875rem 1.125rem; border-radius:var(--r-sm); font-size:.875rem; border-left:4px solid; }
.alert--error    { background:#FEF2F2; border-color:var(--c-danger); color:#B91C1C; }
.alert--success  { background:#F0FDF4; border-color:var(--c-success); color:#15803D; }
.alert--info     { background:var(--c-primary-light); border-color:var(--c-primary); color:#1D4ED8; }
.toast-container { position:fixed; bottom:1.5rem; right:1.5rem; z-index:999; display:flex; flex-direction:column; gap:.625rem; pointer-events:none; }
.toast           { padding:1rem 1.375rem; border-radius:var(--r-lg); color:#fff; font-size:.875rem; font-weight:600; box-shadow:var(--s-xl); animation:toastIn .35s cubic-bezier(.175,.885,.32,1.275); min-width:260px; max-width:380px; }
.toast--success  { background:linear-gradient(135deg,#059669,#10B981); }
.toast--error    { background:linear-gradient(135deg,#B91C1C,#EF4444); }
.toast--info     { background:linear-gradient(135deg,#1D4ED8,#3B82F6); }
.toast--warning  { background:linear-gradient(135deg,#B45309,#F59E0B); }
@keyframes toastIn { from{transform:translateX(110%) scale(.9);opacity:0} to{transform:translateX(0) scale(1);opacity:1} }

/* ══════════════════════════════════════════════
   23. MODAL
══════════════════════════════════════════════ */
.modal-overlay { position:fixed; inset:0; background:rgba(0,0,0,.55); backdrop-filter:blur(4px); z-index:200; display:flex; align-items:center; justify-content:center; padding:1rem; animation:fadeIn .2s ease; }
.modal-overlay.hidden { display:none; animation:none; }
.modal         { background:var(--c-white); border-radius:var(--r-xl); width:100%; max-width:560px; max-height:90vh; overflow-y:auto; box-shadow:var(--s-xl); }
.modal__header { padding:1.375rem 1.5rem; border-bottom:1px solid var(--c-gray-200); display:flex; align-items:center; justify-content:space-between; }
.modal__title  { font-size:1.125rem; font-weight:700; }
.modal__body   { padding:1.5rem; }
.modal__footer { padding:1rem 1.5rem; border-top:1px solid var(--c-gray-200); display:flex; justify-content:flex-end; gap:.75rem; }
@keyframes fadeIn { from{opacity:0} to{opacity:1} }

/* ══════════════════════════════════════════════
   24. TABLEAU
══════════════════════════════════════════════ */
.table-wrap { overflow-x:auto; }
table   { width:100%; border-collapse:collapse; }
th      { text-align:left; padding:.75rem 1rem; font-size:.72rem; font-weight:800; text-transform:uppercase; letter-spacing:.06em; color:var(--c-gray-500); border-bottom:2px solid var(--c-gray-200); white-space:nowrap; background:var(--c-gray-50); }
td      { padding:.875rem 1rem; border-bottom:1px solid var(--c-gray-100); font-size:.875rem; }
tr:last-child td { border-bottom:none; }
tr:hover td { background:var(--c-gray-50); }
.td-actions { display:flex; gap:.4rem; }

/* ══════════════════════════════════════════════
   25. HOMEPAGE
══════════════════════════════════════════════ */
.page-hero {
  background:linear-gradient(135deg, #0F172A 0%, #1E3A5F 60%, #1E40AF 100%);
  color:#fff; padding:7.5rem 0 6rem; text-align:center; margin-top:var(--nav-h);
  position:relative; overflow:hidden;
}
.page-hero::before {
  content:''; position:absolute; inset:0;
  background:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.page-hero h1   { color:#fff; margin-bottom:1.5rem; position:relative; }
.page-hero p    { font-size:1.15rem; opacity:.8; max-width:600px; margin:0 auto 2.5rem; position:relative; line-height:1.7; }
.hero-badge     { display:inline-flex; align-items:center; gap:.5rem; background:rgba(255,255,255,.1); border:1px solid rgba(255,255,255,.2); border-radius:var(--r-full); padding:.375rem 1rem; font-size:.8rem; font-weight:600; margin-bottom:1.5rem; position:relative; }
.hero-actions   { display:flex; align-items:center; justify-content:center; gap:1rem; flex-wrap:wrap; position:relative; }
.hero-stats     { display:flex; justify-content:center; gap:3rem; margin-top:4rem; flex-wrap:wrap; position:relative; }
.hero-stat      { text-align:center; }
.hero-stat__val { font-size:2.25rem; font-weight:800; color:var(--c-accent); letter-spacing:-.03em; }
.hero-stat__lbl { font-size:.8rem; opacity:.65; margin-top:.125rem; }

.section       { padding:5rem 0; }
.section--white{ background:var(--c-white); }
.section--gray { background:var(--c-gray-50); }
.section__hdr  { text-align:center; margin-bottom:3.5rem; }
.section__hdr h2 { margin-bottom:.75rem; }
.section__hdr p  { color:var(--c-gray-500); max-width:600px; margin:0 auto; font-size:1.05rem; }
.section__tag  { display:inline-block; background:var(--c-primary-light); color:var(--c-primary); font-size:.72rem; font-weight:800; text-transform:uppercase; letter-spacing:.1em; padding:.25rem .75rem; border-radius:var(--r-full); margin-bottom:1rem; }

/* Features */
.feature-card      { text-align:center; padding:2rem; }
.feature-card__icon{ width:68px; height:68px; border-radius:var(--r-xl); background:var(--c-primary-light); display:flex; align-items:center; justify-content:center; font-size:2rem; margin:0 auto 1.25rem; box-shadow:0 4px 12px rgba(59,130,246,.2); }
.feature-card h3   { margin-bottom:.5rem; }
.feature-card p    { font-size:.875rem; color:var(--c-gray-500); line-height:1.7; }

/* Steps */
.step      { text-align:center; padding:1.5rem; position:relative; }
.step__num { width:60px; height:60px; border-radius:50%; background:linear-gradient(135deg,var(--c-primary),#7C3AED); color:#fff; font-size:1.5rem; font-weight:800; display:flex; align-items:center; justify-content:center; margin:0 auto 1.25rem; box-shadow:0 4px 16px rgba(59,130,246,.35); }
.step h3   { margin-bottom:.5rem; }
.step p    { font-size:.875rem; color:var(--c-gray-500); line-height:1.7; }

/* Testimonials */
.testimonial { background:var(--c-white); border-radius:var(--r-xl); padding:1.75rem; border:1px solid var(--c-gray-200); box-shadow:var(--s-sm); position:relative; }
.testimonial__quote { font-size:3rem; line-height:1; color:var(--c-primary-mid); position:absolute; top:1rem; right:1.5rem; font-weight:900; }
.testimonial p { font-size:.9rem; color:var(--c-gray-600); line-height:1.75; margin-bottom:1.25rem; }
.testimonial__author { display:flex; align-items:center; gap:.75rem; }

/* CTA section */
.cta-section { background:linear-gradient(135deg,var(--c-primary) 0%,#7C3AED 100%); color:#fff; padding:5.5rem 0; text-align:center; }
.cta-section h2 { color:#fff; margin-bottom:1rem; }
.cta-section p  { opacity:.85; margin-bottom:2.5rem; font-size:1.1rem; }

/* ══════════════════════════════════════════════
   26. FOOTER
══════════════════════════════════════════════ */
.footer       { background:var(--c-gray-900); color:rgba(255,255,255,.65); padding:3.5rem 0 1.5rem; }
.footer__grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:2.5rem; margin-bottom:2.5rem; }
.footer__brand{ font-size:1.375rem; font-weight:800; color:#fff; display:block; margin-bottom:.875rem; letter-spacing:-.01em; }
.footer__brand span { color:var(--c-accent); }
.footer__desc { font-size:.85rem; line-height:1.75; }
.footer__col h4 { color:#fff; margin-bottom:1rem; font-size:.78rem; text-transform:uppercase; letter-spacing:.1em; }
.footer__col a  { display:block; color:rgba(255,255,255,.55); font-size:.875rem; margin-bottom:.5rem; transition:var(--t); }
.footer__col a:hover { color:#fff; text-decoration:none; }
.footer__bottom { border-top:1px solid rgba(255,255,255,.1); padding-top:1.5rem; font-size:.8rem; display:flex; justify-content:space-between; flex-wrap:wrap; gap:.5rem; }
@media(max-width:768px){ .footer__grid { grid-template-columns:1fr 1fr; } }
@media(max-width:480px){ .footer__grid { grid-template-columns:1fr; } }

/* ══════════════════════════════════════════════
   27. BUILDER
══════════════════════════════════════════════ */
.builder-topbar {
  position:fixed; top:var(--nav-h); left:0; right:0; background:var(--c-white);
  border-bottom:1px solid var(--c-gray-200); z-index:90;
  padding:.75rem 1.5rem; display:flex; align-items:center; gap:1rem;
  box-shadow:var(--s-sm);
}
.builder-body { padding-top:calc(var(--nav-h) + 58px); padding-bottom:3rem; }
.builder-layout { display:grid; grid-template-columns:300px 1fr; gap:1.5rem; align-items:start; }
.builder-left   { position:sticky; top:calc(var(--nav-h) + 70px); max-height:calc(100vh - var(--nav-h) - 80px); overflow-y:auto; display:flex; flex-direction:column; gap:1.25rem; }
.builder-panel  { background:var(--c-white); border-radius:var(--r-lg); border:1px solid var(--c-gray-200); box-shadow:var(--s-xs); overflow:hidden; }
.builder-panel__hdr { padding:.875rem 1rem; border-bottom:1px solid var(--c-gray-200); display:flex; align-items:center; justify-content:space-between; background:var(--c-gray-50); }
.builder-panel__title { font-size:.8rem; font-weight:800; text-transform:uppercase; letter-spacing:.07em; color:var(--c-gray-600); }
.unsaved-dot { width:8px; height:8px; border-radius:50%; background:var(--c-warning); display:inline-block; margin-left:.5rem; box-shadow:0 0 0 3px rgba(245,158,11,.2); animation:pulse 2s infinite; }
@keyframes pulse { 0%,100%{box-shadow:0 0 0 3px rgba(245,158,11,.2)} 50%{box-shadow:0 0 0 5px rgba(245,158,11,.1)} }

/* Element toolbar */
.element-toolbar { display:flex; flex-wrap:wrap; gap:.5rem; padding:.875rem; background:var(--c-gray-50); border-radius:var(--r); margin-bottom:1.125rem; border:2px dashed var(--c-gray-200); }
.elem-type-btn   { padding:.45rem .875rem; border-radius:var(--r-sm); background:var(--c-white); border:2px solid var(--c-gray-200); font-size:.78rem; font-weight:700; cursor:pointer; transition:var(--t); display:flex; align-items:center; gap:.4rem; }
.elem-type-btn:hover { border-color:var(--c-primary); color:var(--c-primary); background:var(--c-primary-light); transform:translateY(-1px); }

/* Quiz builder */
.quiz-opt-row { display:flex; align-items:center; gap:.5rem; margin-bottom:.5rem; }
.quiz-opt-row input[type=radio] { accent-color:var(--c-primary); width:16px; height:16px; flex-shrink:0; cursor:pointer; }

/* Tabs builder */
.tab-builder-item { border:1px solid var(--c-gray-200); border-radius:var(--r-sm); padding:.75rem; margin-bottom:.75rem; position:relative; background:var(--c-gray-50); }

/* ══════════════════════════════════════════════
   28. VISIONNEUSE DE FORMATION
══════════════════════════════════════════════ */
.course-layout  { display:flex; min-height:calc(100vh - var(--nav-h)); margin-top:var(--nav-h); }
.course-sidebar { width:300px; flex-shrink:0; background:var(--c-white); border-right:1px solid var(--c-gray-200); position:sticky; top:var(--nav-h); height:calc(100vh - var(--nav-h)); overflow-y:auto; display:flex; flex-direction:column; }
.course-sidebar__hdr { padding:1.25rem 1rem; border-bottom:1px solid var(--c-gray-200); }
.course-sidebar__title { font-weight:800; font-size:.9rem; margin-bottom:.875rem; line-height:1.4; }

/* Navigation arbre de formation */
.ctree-unit    { }
.ctree-unit__hdr { padding:.625rem 1rem; display:flex; align-items:center; gap:.5rem; cursor:pointer; font-size:.78rem; font-weight:800; text-transform:uppercase; letter-spacing:.06em; color:var(--c-gray-500); background:var(--c-gray-50); border-bottom:1px solid var(--c-gray-200); transition:background var(--t); user-select:none; }
.ctree-unit__hdr:hover { background:var(--c-gray-100); }
.ctree-unit__toggle { font-size:.6rem; transition:transform var(--t); }
.ctree-unit__toggle.open { transform:rotate(90deg); }
.ctree-module  { }
.ctree-module__hdr { padding:.5rem 1rem .5rem 1.5rem; display:flex; align-items:center; gap:.5rem; cursor:pointer; font-size:.8rem; font-weight:600; color:var(--c-gray-600); border-bottom:1px solid var(--c-gray-100); transition:background var(--t); user-select:none; }
.ctree-module__hdr:hover { background:var(--c-gray-50); }
.ctree-module__toggle { font-size:.55rem; transition:transform var(--t); }
.ctree-module__toggle.open { transform:rotate(90deg); }
.ctree-chapter { padding:.5rem 1rem .5rem 2.5rem; display:flex; align-items:center; gap:.625rem; cursor:pointer; font-size:.8rem; color:var(--c-gray-600); border-bottom:1px solid var(--c-gray-100); transition:background var(--t); }
.ctree-chapter:hover   { background:var(--c-gray-50); }
.ctree-chapter.active  { background:var(--c-primary-light); color:var(--c-primary); font-weight:600; }
.ctree-chapter.done    { color:var(--c-success); }
.ctree-chapter .ccheck { font-size:.8rem; flex-shrink:0; }
.ctree-children.hidden { display:none; }

.course-main { flex:1; padding:2.5rem; max-width:880px; min-width:0; }
.course-content { line-height:1.85; }
.course-content h2 { font-size:1.5rem; margin:2rem 0 .875rem; padding-bottom:.5rem; border-bottom:2px solid var(--c-gray-200); }
.course-content h3 { font-size:1.125rem; margin:1.5rem 0 .625rem; }
.course-content p  { margin-bottom:1rem; color:var(--c-gray-700); }
.course-content ul, .course-content ol { margin:.75rem 0 1rem 1.75rem; }
.course-content li { margin-bottom:.375rem; color:var(--c-gray-700); }
.course-nav-btns   { display:flex; justify-content:space-between; margin-top:3rem; padding-top:1.5rem; border-top:2px solid var(--c-gray-200); }

/* ══════════════════════════════════════════════
   29. AVATAR
══════════════════════════════════════════════ */
.avatar    { width:40px; height:40px; border-radius:50%; background:var(--c-primary); color:#fff; display:flex; align-items:center; justify-content:center; font-weight:800; font-size:.8rem; flex-shrink:0; }
.avatar--sm{ width:30px; height:30px; font-size:.65rem; }
.avatar--lg{ width:72px; height:72px; font-size:1.5rem; }
.avatar--xl{ width:88px; height:88px; font-size:1.875rem; }
.avatar--accent { background:var(--c-accent); }
.avatar--green  { background:var(--c-success); }
.avatar--admin  { background:var(--c-admin); }
.avatar--formateur { background:var(--c-formateur); }

/* ══════════════════════════════════════════════
   30. UTILITAIRES
══════════════════════════════════════════════ */
.hidden   { display:none !important; }
.invisible{ visibility:hidden; }
.mt-1{margin-top:.5rem}  .mt-2{margin-top:1rem}  .mt-3{margin-top:1.5rem}  .mt-4{margin-top:2rem}
.mb-1{margin-bottom:.5rem}.mb-2{margin-bottom:1rem}.mb-3{margin-bottom:1.5rem}.mb-4{margin-bottom:2rem}
.p-2{padding:1rem} .p-3{padding:1.5rem} .px-3{padding-left:1.5rem;padding-right:1.5rem}
.w-full { width:100%; }
.rounded { border-radius:var(--r); }
.border  { border:1px solid var(--c-gray-200); }
.bg-white{ background:var(--c-white); }
.shadow  { box-shadow:var(--s); }
.truncate{ white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.divider { border:none; border-top:1px solid var(--c-gray-200); margin:1.5rem 0; }

/* Responsive sidebar */
@media(max-width:768px){
  .sidebar { transform:translateX(-100%); transition:transform var(--t); }
  .sidebar.open { transform:translateX(0); }
  .main-content { margin-left:0; }
  .nav__links { display:none; }
  .builder-layout { grid-template-columns:1fr; }
  .course-sidebar { display:none; }
}