:root{
  --bg:#f4f6f8;--surface:#fff;--text:#1f2933;--muted:#667085;--line:#d9e0e7;
  --primary:#234b72;--primary2:#183754;--danger:#b42318;--success:#067647;
  --radius:16px;--shadow:0 8px 24px rgba(16,24,40,.06)
}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}
a{color:inherit;text-decoration:none}
.topbar{min-height:64px;background:var(--surface);border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:12px 24px;position:sticky;top:0;z-index:10}
.brand{font-weight:800;color:var(--primary)}
.topbar nav{display:flex;gap:18px;font-size:.95rem;flex-wrap:wrap;justify-content:flex-end}
.container{max-width:1180px;margin:0 auto;padding:32px 20px 56px}
.footer{text-align:center;color:var(--muted);padding:18px;font-size:.85rem}
.card,.auth-card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;margin-bottom:18px}
.auth-card{max-width:420px;margin:8vh auto}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:18px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin:20px 0}
.stat{font-size:1.8rem;font-weight:800;display:block;margin-bottom:4px}
.hero{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}
.eyebrow{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--primary);font-weight:800}
h1{margin:.15em 0 .35em;font-size:clamp(1.8rem,4vw,2.6rem)}
h2{margin-top:0}h3{margin:0}
.muted,.meta{color:var(--muted)}.meta{font-size:.9rem}
label{display:block;font-weight:650;margin:14px 0 6px}
input,select,textarea{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:10px;background:#fff;font:inherit;margin-top:6px}
textarea{resize:vertical}
button,.button{display:inline-block;border:0;border-radius:10px;background:var(--primary);color:#fff;padding:11px 16px;font-weight:750;cursor:pointer;margin-top:14px}
button:hover,.button:hover{background:var(--primary2)}
button:disabled{opacity:.45;cursor:not-allowed}
.button.secondary{background:#e9eef4;color:var(--primary);margin-top:0}
.inline-form{display:flex;gap:10px;align-items:flex-end}
.inline-form input{flex:1}.inline-form button{margin-top:6px}
.flash{padding:12px 14px;border-radius:10px;margin-bottom:16px}.flash.error{background:#fee4e2;color:var(--danger)}.flash.success{background:#d1fadf;color:var(--success)}
ul{padding-left:20px}
.two-columns{display:grid;grid-template-columns:minmax(0,2fr) minmax(260px,1fr);gap:22px;align-items:start}
.sticky-card{position:sticky;top:88px}
.badge{display:inline-flex;background:#e9eef4;color:var(--primary);border-radius:999px;padding:5px 9px;font-size:.78rem;font-weight:800}
.chapter-card{transition:.15s ease}.chapter-card:hover{transform:translateY(-1px);border-color:#b8c7d6}
.session-card{display:flex;gap:14px;align-items:center}
.session-number{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:#e9eef4;color:var(--primary);font-weight:800;flex:0 0 auto}
.assignment-row,.dashboard-row,.progress-row{display:flex;justify-content:space-between;align-items:center;gap:14px;border-top:1px solid var(--line);padding:12px 0}
.assignment-row:first-of-type,.dashboard-row:first-of-type{border-top:0}
.assignment-row form{margin:0}.small-button{margin:0;padding:8px 10px;font-size:.85rem}
.status{font-size:.8rem;font-weight:800;border-radius:999px;padding:5px 8px}.status.done{background:#d1fadf;color:var(--success)}
.backlink{color:var(--primary);font-weight:700}
.progress-header,.section-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}
.section-heading a{color:var(--primary);font-weight:700}
.progress-row{align-items:center}.progress-actions{display:flex;gap:8px;align-items:center}.progress-actions select{margin:0;min-width:125px}
.editor-layout{display:grid;grid-template-columns:minmax(0,2.1fr) minmax(280px,.9fr);gap:22px;align-items:start}
.lesson-block{background:#fff;border:1px solid var(--line);border-left:5px solid #7b8da0;border-radius:14px;padding:16px;margin-bottom:14px;box-shadow:var(--shadow)}
.block-head{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:10px}
.block-type{font-weight:800;color:var(--primary);margin-right:8px}
.visibility{font-size:.78rem;color:var(--muted)}
.block-tools{display:flex;gap:5px}.block-tools form{margin:0}
.icon-button{margin:0;padding:6px 9px;background:#e9eef4;color:var(--primary)}
.icon-button:hover{background:#dce6f0}
.block-edit-row{display:flex;gap:10px;align-items:center;margin-top:8px}
.block-edit-row select{margin:0;flex:1}
.lesson-block textarea{margin-top:0}
.lesson-block>form{margin:0}
.delete-button{background:transparent;color:var(--danger);padding:5px 0;margin-top:8px}
.delete-button:hover{background:transparent;text-decoration:underline}
.block-learning_objective{border-left-color:#3567a8}
.block-definition{border-left-color:#7a4ea3}
.block-document{border-left-color:#8a6d1f}
.block-question{border-left-color:#277e78}
.block-activity,.block-exercise{border-left-color:#a85a2f}
.block-summary,.block-written_trace{border-left-color:#3a7b52}
.block-teacher_note,.block-correction{border-left-color:#b42318}
.block-homework{border-left-color:#5d5fef}
@media(max-width:800px){
  .topbar{padding:10px 14px;align-items:flex-start;gap:10px}.topbar nav{gap:10px;font-size:.83rem}
  .stats{grid-template-columns:repeat(2,1fr)}
  .two-columns,.editor-layout{grid-template-columns:1fr}.sticky-card{position:static}
  .progress-row{align-items:flex-start;flex-direction:column}.progress-actions{width:100%}.progress-actions select{flex:1}
}
@media(max-width:520px){
  .stats{grid-template-columns:1fr}.hero{display:block}.hero .button{margin-top:10px}
  .block-edit-row{flex-direction:column;align-items:stretch}
}


.edit-row{display:grid;grid-template-columns:1fr auto auto;gap:8px;align-items:center;border-top:1px solid var(--line);padding:10px 0}
.class-edit-row{grid-template-columns:1fr 1fr auto auto}
.edit-row input,.edit-row select{margin:0}
.delete-small{margin:0;padding:8px 10px;background:transparent;color:var(--danger);border:1px solid #f0b9b4}
.delete-small:hover{background:#fff1f0}
.chapter-edit-form{max-width:760px;margin-top:12px}
.title-input{font-size:1.5rem;font-weight:800}
.session-edit-card{display:grid;grid-template-columns:40px 1fr auto;gap:12px;align-items:center}
.session-edit-form{display:grid;grid-template-columns:minmax(220px,1fr) 100px auto auto auto;gap:8px;align-items:center}
.session-edit-form input{margin:0}
.small-link{color:var(--primary);font-weight:700;white-space:nowrap}
.block-type-select{margin:0 0 8px}
@media(max-width:800px){
  .edit-row,.class-edit-row{grid-template-columns:1fr}
  .session-edit-card{grid-template-columns:40px 1fr}
  .session-edit-form{grid-column:2;grid-template-columns:1fr}
}


.preview-actions{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 22px}
.preview-topbar{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px}
.preview-switch{display:inline-flex;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff}
.preview-switch a{padding:8px 12px;color:var(--muted);font-weight:700}
.preview-switch a.active{background:var(--primary);color:#fff}
.course-document{max-width:900px;margin:0 auto;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);padding:42px 48px;border-radius:8px}
.course-document-header{border-bottom:2px solid var(--primary);padding-bottom:18px;margin-bottom:28px}
.course-document-header h1{font-size:2rem;margin:.25em 0}
.document-kicker{font-weight:700;color:var(--muted);margin:10px 0 0}
.document-version{font-size:.85rem;color:var(--muted);margin-bottom:0}
.rendered-session{margin:0 0 42px}
.rendered-session>h2{border-bottom:1px solid var(--line);padding-bottom:8px;margin-bottom:18px}
.rendered-block{margin:0 0 18px;padding:14px 16px;border-left:4px solid #7b8da0;background:#fafbfc;border-radius:4px}
.rendered-block-label{font-size:.78rem;text-transform:uppercase;letter-spacing:.04em;font-weight:800;color:var(--primary);margin-bottom:7px}
.rendered-block-content{line-height:1.55}
.rendered-learning_objective{border-left-color:#3567a8}
.rendered-definition{border-left-color:#7a4ea3}
.rendered-document{border-left-color:#8a6d1f}
.rendered-question{border-left-color:#277e78}
.rendered-activity,.rendered-exercise{border-left-color:#a85a2f}
.rendered-summary,.rendered-written_trace{border-left-color:#3a7b52}
.rendered-teacher_note,.rendered-correction{border-left-color:#b42318}
.rendered-homework{border-left-color:#5d5fef}
.teacher-only{background:#fff6f5}
.format-toolbar{display:flex;gap:5px;margin:8px 0 6px}
.format-toolbar button{margin:0;width:34px;height:30px;padding:0;background:#eef2f6;color:var(--text);border:1px solid var(--line)}
.format-toolbar button:hover{background:#e2e8ef}
.format-help{font-size:.78rem;color:var(--muted);margin:4px 0 0}
@media(max-width:700px){
  .course-document{padding:24px 20px}
  .preview-topbar{align-items:flex-start;flex-direction:column}
}
@media print{
  body{background:#fff}
  .topbar,.footer,.no-print{display:none!important}
  .container{max-width:none;padding:0}
  .course-document{max-width:none;border:0;box-shadow:none;padding:0;border-radius:0}
}


.hidden{display:none!important}
.checkbox-label{display:flex;gap:8px;align-items:center;font-weight:600}
.checkbox-label input{width:auto;margin:0}
.table-editor{border:1px solid var(--line);border-radius:10px;padding:10px;margin-top:8px;overflow:auto}
.table-editor-row{display:flex;gap:6px;margin-bottom:6px;min-width:max-content}
.table-editor-row input{min-width:120px;margin:0}
.table-editor-actions{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
.course-table{width:100%;border-collapse:collapse;margin:8px 0}
.course-table th,.course-table td{border:1px solid #aeb8c2;padding:8px 10px;vertical-align:top;text-align:left}
.course-table th{background:#eef2f6;font-weight:800}
.table-scroll{overflow-x:auto}
.definition-term{font-weight:800;margin-bottom:6px}
.definition-text{line-height:1.55}
.rendered-definition .definition-term::after{content:" :"}
.rendered-text{background:transparent;border-left:0;padding:0}
.course-toc{border:1px solid var(--line);background:#fafbfc;border-radius:8px;padding:18px 20px;margin:0 0 30px}
.course-toc h2{margin:0 0 12px}
.course-toc a{display:block;padding:4px 0;color:var(--text)}
.course-toc a:hover{text-decoration:underline}
.course-toc .toc-level-2{padding-left:22px}
.course-toc .toc-level-3{padding-left:44px}
.course-heading{scroll-margin-top:90px;color:var(--text)}
.heading-level-1{font-size:1.55rem;margin:34px 0 16px;border-bottom:2px solid var(--primary);padding-bottom:7px}
.heading-level-2{font-size:1.28rem;margin:26px 0 12px}
.heading-level-3{font-size:1.08rem;margin:20px 0 10px}
.heading-number{color:var(--primary);margin-right:6px}
.session-title{margin-top:36px}
.lesson-block.block-heading_1,.lesson-block.block-heading_2,.lesson-block.block-heading_3{border-left-color:var(--primary)}
.lesson-block.block-text{border-left-color:#aab4bf}
@media print{
  .course-toc a{color:#000;text-decoration:none}
  .table-scroll{overflow:visible}
}


/* V0.4.2 — éditeur pleine largeur */
.editor-layout{
  display:flex;
  flex-direction:column;
  gap:22px;
}
.editor-layout .add-block-panel{
  order:-1;
  width:100%;
  position:static;
  margin-bottom:0;
}
.editor-layout .block-list{
  width:100%;
}
.add-block-panel form{
  width:100%;
}
.add-block-panel textarea{
  min-height:140px;
}
.add-block-panel .block-editor-definition{
  display:grid;
  grid-template-columns:minmax(220px,.7fr) minmax(320px,1.3fr);
  gap:16px;
}
.add-block-panel .block-editor-definition label{
  margin-top:0;
}
.add-block-panel .block-editor-table{
  width:100%;
}
.table-editor{
  width:100%;
  overflow-x:auto;
}
.table-editor-row{
  display:flex;
  gap:8px;
  width:100%;
  min-width:max-content;
}
.table-editor-row input{
  flex:1 1 180px;
  min-width:180px;
}
.table-editor-actions{
  position:sticky;
  left:0;
  background:var(--surface);
  padding-top:8px;
}
@media(max-width:800px){
  .add-block-panel .block-editor-definition{
    grid-template-columns:1fr;
  }
  .table-editor-row input{
    min-width:150px;
  }
}


/* V0.5.0 — structure pédagogique réelle */
.rendered-official_objectives,
.rendered-prerequisites,
.rendered-problem_statement,
.rendered-sequence_objectives,
.rendered-session_objective{
  border-left-color:#3567a8;
}
.rendered-dossier,
.rendered-document,
.rendered-activity{
  border-left-color:#6d7884;
  background:#fbfbfc;
}
.rendered-key_point{
  border-left-color:#c0392b;
  background:#fff5f4;
}
.rendered-key_point .rendered-block-label{
  color:#b42318;
}
.rendered-chapter_summary,
.rendered-summary{
  border-left-color:#56834f;
  background:#f3f8ef;
}
.rendered-vocabulary{
  border-left-color:#6f7f8d;
}
.question-text{
  font-weight:700;
  margin-bottom:8px;
}
.answer-lines{
  margin-top:12px;
}
.answer-line{
  height:22px;
  border-bottom:1px dotted #aeb8c2;
}
.block-editor-question{
  display:grid;
  grid-template-columns:minmax(0,1fr) 180px;
  gap:16px;
}
.block-editor-question label{
  margin-top:0;
}
.chapter-structure-card{
  margin-top:4px;
}
.chapter-structure-row{
  display:flex;
  justify-content:space-between;
  gap:16px;
  align-items:flex-start;
  padding:12px 0;
  border-top:1px solid var(--line);
}
.chapter-structure-row:first-of-type{
  border-top:0;
}
.chapter-add-details{
  margin-top:14px;
  border-top:1px solid var(--line);
  padding-top:14px;
}
.chapter-add-details summary{
  cursor:pointer;
  color:var(--primary);
  font-weight:800;
}
.chapter-block-form{
  margin-top:14px;
}
@media(max-width:800px){
  .block-editor-question{
    grid-template-columns:1fr;
  }
}


/* V0.5.1 — édition et réordonnancement de la structure du chapitre */
.chapter-structure-row{
  display:grid;
  grid-template-columns:34px minmax(0,1fr);
  align-items:start;
}
.chapter-structure-content{
  min-width:0;
}
.chapter-structure-summary{
  display:flex;
  justify-content:space-between;
  gap:20px;
  align-items:flex-start;
}
.chapter-structure-actions{
  display:flex;
  gap:8px;
  align-items:center;
  flex:0 0 auto;
}
.chapter-structure-actions form{
  margin:0;
}
.drag-handle{
  width:28px;
  min-width:28px;
  height:38px;
  padding:0;
  margin:0;
  border:0;
  background:transparent;
  color:var(--muted);
  cursor:grab;
  font-size:1.15rem;
  letter-spacing:-3px;
}
.drag-handle:hover{
  background:transparent;
  color:var(--primary);
}
.draggable-structure-row.dragging{
  opacity:.45;
}
.draggable-structure-row.drag-over{
  border-top:3px solid var(--primary);
}
.chapter-block-edit-form{
  margin-top:14px;
  padding:14px;
  background:#f8fafc;
  border:1px solid var(--line);
  border-radius:10px;
}
.chapter-block-edit-form label:first-of-type{
  margin-top:0;
}
.chapter-edit-buttons{
  display:flex;
  gap:8px;
  align-items:center;
  margin-top:12px;
}
.chapter-edit-buttons .button{
  margin:0;
  padding:8px 10px;
  font-size:.85rem;
}
.reorder-status{
  min-height:22px;
  margin-top:6px;
  color:var(--primary);
}
@media(max-width:700px){
  .chapter-structure-summary{
    flex-direction:column;
  }
  .chapter-structure-actions{
    width:100%;
  }
}