/* Site d'exercices quiz_generator. Produced by: written by the orchestrating model,
   Claude Fable 5.1, 2026-09-22 ; header with the HE-Arc logo and course home page
   added by the orchestrating model Claude Opus 5.5, 2026-09-23. Aucune dépendance externe.
   modified by a sub-agent (Claude Opus 5.5, site-shell implementer), 2026-09-24: colour
   tokens named by role with the contrasts of docs/site_design_2026-09-24.md (section 7.6),
   solid course bands, global focus ring, skip link, audience panels, course rows, chips,
   breadcrumbs, restructured course page (details), resume card, notices, check marks,
   44 px touch targets, full-width actions under 480 px, reduced motion.
   modified by a sub-agent (Claude Opus 5.5, exercise-type implementer), 2026-09-24: styles
   of the four new exercise types of docs/site_design_2026-09-24.md, section 8 (two_tier,
   case, error_spot, short_answer), token --relation-ink/--relation-bg, formula and worked
   solution styles shared with the stage feedback of a case.
   post-generation fix by a sub-agent (Claude Opus 5.5, code reviewer), 2026-09-24: visible
   keyboard focus on the numbered cases of a diagram (.dg-node.fill:focus-visible); placed
   labels of the palette without opacity (text 5.58:1, border 3.77:1 on --bg). */
:root {
  /* text and surfaces */
  --ink: #1f2937;            /* 14.68:1 on white */
  --muted: #5b6472;          /* 5.98:1 on white, 5.58:1 on --bg */
  --bg: #f6f7f9;
  --card: #ffffff;
  --line: #e5e7eb;           /* decorative separators only */
  --control-border: #767f8f; /* borders of options, fields, lists, pills: 4.04:1 on white */
  /* actions */
  --action: #005294;         /* links, buttons, focus ring: 7.97:1 on white */
  --action-dark: #003a69;
  --action-bg: #e3edf7;
  /* answers */
  --ok: #2e7d32;
  --ok-bg: #e8f5e9;
  --ko: #c62828;
  --ko-bg: #fdecea;
  /* brand (HE-Arc green, sampled on the logo) */
  --arc: #68a023;            /* header rule only (decorative) */
  --arc-dark: #4e7a19;       /* 5.09:1 with white */
  /* courses */
  --coeur: #b3261e;          /* 6.54:1 with white */
  --neuro: #5b3e96;          /* 8.16:1 with white */
  --cellule: #0f766e;        /* 5.47:1 with white */
  --course-default: #005294;
  /* audiences */
  --aud-aps-ink: #8a5a00;
  --aud-aps-bg: #fbf3dc;     /* 5.35:1 */
  --aud-bachelor-ink: #3f6212;
  --aud-bachelor-bg: #ecfccb; /* 6.52:1 */
  /* "Lien" tag of a short_answer criterion (SOLO relational level) */
  --relation-ink: #8a5a00;
  --relation-bg: #fbf3dc;    /* 5.35:1 */
  --radius: 12px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 72px; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.45;
}
[hidden] { display: none !important; }
.sr-only {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

/* ---- focus (WCAG 2.2, 2.4.7 and 2.4.11) ---- */
:focus-visible { outline: 3px solid var(--action); outline-offset: 2px; }
main:focus, [tabindex="-1"]:focus:not(:focus-visible) { outline: none; }
h1[tabindex="-1"]:focus, h2[tabindex="-1"]:focus, h3[tabindex="-1"]:focus { outline: none; }
.skip-link {
  position: absolute; left: 8px; top: -200px; z-index: 10;
  background: var(--action); color: #fff; padding: 10px 14px; border-radius: 8px;
  font-weight: 600; text-decoration: none;
}
.skip-link:focus { top: 8px; }

/* ---- header ---- */
.top {
  position: sticky; top: 0; z-index: 2;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 8px 16px;
  background: #fff; color: var(--ink);
  border-bottom: 4px solid var(--arc);
}
.brand { display: inline-flex; align-items: center; padding: 4px 0; }
.brand img { height: 40px; width: auto; display: block; }
.top-nav { display: flex; align-items: center; gap: 12px; min-width: 0; }
.top-course { font-weight: 600; color: var(--action-dark); font-size: 0.9rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.top-link { color: var(--action); text-decoration: underline; display: inline-flex; align-items: center; min-height: 44px; white-space: nowrap; }
@media (max-width: 480px) { .top-course { display: none; } .brand img { height: 28px; } }

main { max-width: 720px; margin: 0 auto; padding: 16px; }
h1 { font-size: 1.5rem; margin: 8px 0 4px; color: var(--action-dark); }
h2 { font-size: 1.1rem; margin: 20px 0 8px; color: var(--action-dark); }
.lead { margin: 0 0 8px; color: var(--muted); }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.center { text-align: center; }
a { color: var(--action); }
button { font: inherit; cursor: pointer; }
.link { background: none; border: 0; color: var(--action); text-decoration: underline; padding: 6px 0; min-height: 44px; }
.primary {
  background: var(--action); color: #fff; border: 0; border-radius: var(--radius);
  padding: 12px 18px; font-weight: 600; font-size: 1rem; min-height: 44px;
}
.primary:active { background: var(--action-dark); }
.primary:disabled { background: #9aa3b0; color: #fff; cursor: default; }
.secondary {
  background: #fff; color: var(--action); border: 2px solid var(--action); border-radius: var(--radius);
  padding: 10px 18px; font-weight: 600; font-size: 1rem; min-height: 44px;
}
.cards { display: grid; grid-template-columns: 1fr; gap: 10px; }
@media (min-width: 560px) { .cards { grid-template-columns: 1fr 1fr; } }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 14px 16px;
}
.series {
  text-align: left; width: 100%; background: var(--card); border: 1px solid var(--control-border);
  border-radius: var(--radius); padding: 12px 16px; display: flex; flex-direction: column; gap: 4px;
  min-height: 56px; color: var(--ink);
}
.series:active { border-color: var(--action); }
.series:disabled { cursor: default; opacity: .6; }
.series .name { font-weight: 700; color: var(--action-dark); }
.series .desc { color: var(--muted); font-size: 0.9rem; }
.progress-row { display: flex; align-items: center; gap: 10px; margin: 6px 0; }
.progress-row .label { flex: 1; font-size: 0.95rem; }
.progress-row .track { flex: 2; height: 10px; background: var(--line); border-radius: 5px; overflow: hidden; }
.progress-row .fill { height: 100%; background: var(--ok); width: 0; }
.progress-row .num { width: 3.5em; text-align: right; font-size: 0.9rem; color: var(--muted); }

/* ---- series view ---- */
.quiz-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; margin-bottom: 2px; }
.quiz-title { font-size: 0.95rem; font-weight: 600; color: var(--muted); margin: 0; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.quiz-head .quit { flex: 0 0 auto; }
.quiz-meta { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 6px 10px; margin-bottom: 6px; }
.quiz-meta .chips { display: flex; flex-wrap: wrap; gap: 6px; }
.counter { font-weight: 600; color: var(--action-dark); white-space: nowrap; }
.chip { background: var(--action-bg); color: var(--action-dark); border-radius: 999px; padding: 3px 10px; font-size: 0.8rem; }
.progressbar { height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; margin-bottom: 12px; }
.progressbar div { height: 100%; background: var(--action); width: 0; transition: width .2s; }
.stem { margin: 0 0 6px; }
.lead-in { margin: 0 0 12px; font-size: 1.1rem; color: var(--ink); }
.options { display: grid; gap: 8px; }
.opt {
  display: flex; gap: 10px; align-items: flex-start; width: 100%; text-align: left;
  background: #fff; border: 1px solid var(--control-border); border-radius: var(--radius); padding: 12px 12px;
  font-size: 1rem; min-height: 48px; color: var(--ink);
}
.opt .letter {
  flex: 0 0 auto; width: 28px; height: 28px; border-radius: 50%; display: inline-flex;
  align-items: center; justify-content: center; font-weight: 700; background: var(--bg); color: var(--action-dark);
}
.opt:disabled { cursor: default; opacity: 1; color: var(--ink); }
.opt.correct { border-color: var(--ok); box-shadow: inset 0 0 0 1px var(--ok); background: var(--ok-bg); }
.opt.correct .letter { background: var(--ok); color: #fff; }
.opt.wrong { border-color: var(--ko); box-shadow: inset 0 0 0 1px var(--ko); background: var(--ko-bg); }
.opt.wrong .letter { background: var(--ko); color: #fff; }
.feedback { margin-top: 12px; padding: 12px 14px; border-radius: var(--radius); border-left: 4px solid var(--line); background: var(--bg); }
.feedback.ok { border-left-color: var(--ok); }
.feedback.ko { border-left-color: var(--ko); }
.feedback .verdict { font-weight: 700; margin: 0 0 6px; }
.feedback p { margin: 6px 0; }
.feedback .src { color: var(--muted); font-size: 0.85rem; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 14px; }
@media (max-width: 480px) {
  .actions > .primary, .actions > .secondary, .check, .all-line .secondary { width: 100%; }
}
.score { font-size: 1.4rem; font-weight: 700; color: var(--action-dark); }
.missed { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.missed li { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 12px; }
.missed .q { font-weight: 600; }
.missed .a { color: var(--ok); }
.foot { text-align: center; color: var(--muted); font-size: 0.8rem; padding: 20px 16px 32px; }

/* marks (✓ / ✗) next to corrected elements: the colour does not carry the information alone */
.mark { display: inline-flex; align-items: center; justify-content: center; min-width: 22px; height: 22px; border-radius: 50%; font-size: 0.8rem; font-weight: 700; color: #fff; margin-left: 6px; vertical-align: middle; }
.mark-ok { background: var(--ok); }
.mark-ko { background: var(--ko); }

/* ---- formats supplémentaires (2026-09-22) ---- */
.series-heading { grid-column: 1 / -1; margin: 12px 0 0; font-size: 1rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.chip.type { background: var(--action); color: #fff; }
.opt.tf { justify-content: flex-start; }
.numeric .num-label { display: block; font-weight: 600; margin-bottom: 6px; }
.numeric .num-row { display: flex; gap: 8px; }
.numeric input { flex: 1; width: 0; font: inherit; font-size: 1.1rem; padding: 10px 12px; border: 2px solid var(--control-border); border-radius: var(--radius); min-width: 0; min-height: 44px; }
.steps > * { min-width: 0; }
.numeric input:focus-visible { border-color: var(--action); }
.numeric input[aria-invalid="true"] { border-color: var(--ko); }
.numeric .num-error { margin: 6px 0 0; color: var(--ko); font-weight: 600; font-size: 0.95rem; }
.numeric .hint { margin: 8px 0 0; padding: 8px 12px; background: #fff8e1; border-left: 4px solid #f9a825; border-radius: 6px; }
.feedback .formula, .stage-feedback .formula { font-family: ui-monospace, Consolas, monospace; background: #fff; border: 1px solid var(--line); border-radius: 6px; padding: 6px 10px; display: inline-block; max-width: 100%; }
.feedback .worked, .stage-feedback .worked { white-space: pre-wrap; font: inherit; background: #fff; border: 1px solid var(--line); border-radius: 6px; padding: 10px 12px; margin: 6px 0; }
.ordering .placed { margin: 0 0 10px; padding-left: 26px; display: grid; gap: 6px; }
.ordering .placed li { background: #fff; border: 2px solid var(--action); border-radius: 8px; padding: 8px 10px; }
.ordering .placed li.correct { border-color: var(--ok); background: var(--ok-bg); }
.ordering .placed li.wrong { border-color: var(--ko); background: var(--ko-bg); }
.ordering .pool { display: grid; gap: 8px; }
.ordering .pool-item { justify-content: flex-start; }
.matching { display: grid; gap: 10px; min-width: 0; }
.options > * { min-width: 0; }
.match-row { display: grid; gap: 4px; min-width: 0; background: #fff; border: 2px solid var(--line); border-radius: var(--radius); padding: 10px 12px; }
.match-row label { font-weight: 600; }
.match-row select { font: inherit; padding: 8px 10px; border: 2px solid var(--control-border); border-radius: 8px; background: #fff; width: 100%; min-width: 0; min-height: 44px; }
.match-row.correct { border-color: var(--ok); background: var(--ok-bg); }
.match-row.wrong { border-color: var(--ko); background: var(--ko-bg); }
.answer-list { margin: 4px 0 8px; padding-left: 22px; }

/* ---- formats ajoutés le 2026-09-22 (soir) : direction, classify, cloze, steps, diagram, flashcard ---- */
.check { margin-top: 4px; }
.steps { display: grid; gap: 10px; }
.step { border-left: 4px solid var(--line); padding-left: 10px; }
.step.correct { border-left-color: var(--ok); }
.step.wrong { border-left-color: var(--ko); }
.step-result { margin: 6px 0 0; font-weight: 600; }
.step.correct .step-result { color: var(--ok); }
.step.wrong .step-result { color: var(--ko); }
.classify { display: grid; gap: 8px; }
.cls-row { background: #fff; border: 2px solid var(--line); border-radius: var(--radius); padding: 10px 12px; display: grid; gap: 8px; min-width: 0; }
.cls-text { font-weight: 600; }
.cls-btns { display: flex; flex-wrap: wrap; gap: 6px; }
.cls-btn { background: var(--bg); border: 1px solid var(--control-border); border-radius: 999px; padding: 8px 14px; font-size: 0.95rem; min-height: 44px; color: var(--ink); }
.cls-btn.selected { border-color: var(--action); box-shadow: inset 0 0 0 1px var(--action); background: var(--action-bg); color: var(--action-dark); font-weight: 600; }
.cls-btn:disabled { cursor: default; color: var(--ink); }
.cls-btn.correct { border-color: var(--ok); box-shadow: inset 0 0 0 1px var(--ok); background: var(--ok-bg); font-weight: 600; }
.cls-row.correct { border-color: var(--ok); background: var(--ok-bg); }
.cls-row.wrong { border-color: var(--ko); background: var(--ko-bg); }
.cls-row.wrong .cls-btn.selected:not(.correct) { border-color: var(--ko); box-shadow: inset 0 0 0 1px var(--ko); background: var(--ko-bg); }
.cloze-text { line-height: 2.1; font-size: 1.05rem; margin: 0 0 8px; }
.cloze-text select.blank { font: inherit; font-size: 1rem; padding: 3px 6px; border: 2px solid var(--action); border-radius: 8px; background: #fff; margin: 0 2px; max-width: 100%; vertical-align: baseline; min-height: 32px; }
.cloze-text select.blank.correct { border-color: var(--ok); background: var(--ok-bg); }
.cloze-text select.blank.wrong { border-color: var(--ko); background: var(--ko-bg); }
.cloze-answer { line-height: 1.7; }
.cloze-answer strong { color: var(--ok); }
.diagram-svg { width: 100%; height: auto; display: block; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); margin: 4px 0 10px; }
.dg-edge { fill: none; stroke: var(--control-border); stroke-width: 0.6; }
.dg-arrowhead { fill: var(--control-border); }
.dg-node rect { fill: #fff; stroke: var(--control-border); stroke-width: 0.6; }
.dg-node.fixed rect { fill: #eef2f7; stroke: #98a2b3; }
.dg-node.fill rect { stroke: var(--action); stroke-dasharray: 1.4 1; cursor: pointer; }
.dg-node.fill.filled rect { stroke-dasharray: none; fill: var(--action-bg); }
.dg-node.fill.active rect { stroke-width: 1.2; fill: #fff8e1; }
/* keyboard focus on a numbered case (the outline of SVG elements is not drawn by every browser) */
.dg-node.fill:focus-visible rect { stroke: var(--ink); stroke-width: 1; stroke-dasharray: none; }
.dg-node.correct rect { fill: var(--ok-bg); stroke: var(--ok); stroke-dasharray: none; }
.dg-node.wrong rect { fill: var(--ko-bg); stroke: var(--ko); stroke-dasharray: none; }
.dg-node text { fill: var(--ink); pointer-events: none; }
.dg-node text.dg-num { fill: var(--action); font-weight: 700; font-size: 4.2px; }
.dg-node.fixed text { fill: #4b5563; }
.palette { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.palette .pool-item { width: auto; min-height: 44px; padding: 8px 12px; font-size: 0.95rem; }
/* label already placed, still clickable: dashed border and grey background instead of an
   opacity (0.55 gave 3.52:1 for the text and 1.97:1 for the border) */
.palette .pool-item.used { background: var(--bg); color: var(--muted); border-style: dashed; }
.flash .reveal { width: 100%; }
.fc-answer { background: #fff; border: 2px solid var(--action); border-radius: var(--radius); padding: 12px 14px; margin: 8px 0; line-height: 1.5; }
.fc-grade { display: grid; gap: 8px; }
.fc-grade p { margin: 4px 0 0; }

/* ---- accueil : choix de la formation (2026-09-24) ---- */
.hero { padding: 14px 0 4px; }
.eyebrow { margin: 0 0 4px; color: var(--arc-dark); font-weight: 700; font-size: 0.85rem; letter-spacing: .03em; text-transform: uppercase; }
.hero h1 { font-size: 1.9rem; margin: 0 0 8px; }
.hero .lead { font-size: 1.05rem; max-width: 36em; }
@media (max-width: 480px) {
  main { padding-top: 10px; }
  .hero { padding-top: 0; }
  .hero h1 { font-size: 1.5rem; margin-bottom: 4px; }
  .hero .lead { font-size: 0.95rem; margin-bottom: 4px; }
  #view-landing > h2 { margin-top: 10px; }
}
.notice {
  margin: 8px 0; padding: 10px 14px; border-radius: var(--radius);
  background: #fff8e1; border-left: 4px solid #b26a00; color: var(--ink); font-weight: 600;
}
.resume-card {
  display: flex; flex-direction: column; gap: 4px; margin: 10px 0 4px; padding: 12px 16px;
  background: #fff; border: 1px solid var(--control-border); border-left: 6px solid var(--course-default);
  border-radius: var(--radius); text-decoration: none; color: var(--ink); min-height: 56px;
}
.resume-card .rc-title { font-weight: 700; color: var(--action-dark); }
.resume-card .rc-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; font-size: 0.88rem; color: var(--muted); }
.aud-panels { display: grid; grid-template-columns: 1fr; gap: 14px; }
@media (min-width: 640px) { .aud-panels { grid-template-columns: 1fr 1fr; } }
.aud-panel {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 12px 14px 10px; display: flex; flex-direction: column; gap: 6px; min-width: 0;
}
.aud-panel.aud-aps { border-top: 5px solid var(--aud-aps-ink); }
.aud-panel.aud-bachelor { border-top: 5px solid var(--aud-bachelor-ink); }
.aud-panel .ap-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.aud-panel h3 { margin: 0; font-size: 1.15rem; color: var(--action-dark); }
.aud-panel .ap-desc { margin: 0; color: var(--muted); font-size: 0.92rem; }
.aud-chip {
  display: inline-block; margin: 0; padding: 2px 10px; border-radius: 999px;
  font-size: 0.8rem; font-weight: 700; letter-spacing: .02em;
  background: var(--action-bg); color: var(--action-dark);
}
.aud-chip.aud-aps { background: var(--aud-aps-bg); color: var(--aud-aps-ink); }
.aud-chip.aud-bachelor { background: var(--aud-bachelor-bg); color: var(--aud-bachelor-ink); }
#aud-chip, #course-chip { margin: 4px 0 2px; }
.course-rows { list-style: none; margin: 2px 0 0; padding: 0; display: grid; gap: 8px; }
.course-row {
  display: flex; flex-direction: column; justify-content: center; gap: 2px;
  min-height: 56px; padding: 8px 12px; border: 1px solid var(--control-border);
  border-left: 4px solid var(--course-default); border-radius: 10px;
  background: #fff; text-decoration: none; color: var(--ink);
}
.course-row:hover { background: #fafbfc; }
.course-row .cr-title { font-weight: 700; color: var(--action-dark); }
.course-row .cr-meta { font-size: 0.85rem; color: var(--muted); }
.course-row .track { height: 4px; background: var(--line); border-radius: 2px; overflow: hidden; margin-top: 4px; }
.course-row .fill { height: 100%; background: var(--ok); width: 0; }
.c-coeur.course-row, .c-coeur.resume-card { border-left-color: var(--coeur); }
.c-neuro.course-row, .c-neuro.resume-card { border-left-color: var(--neuro); }
.c-cellule.course-row, .c-cellule.resume-card { border-left-color: var(--cellule); }
.aud-more { align-self: flex-start; display: inline-flex; align-items: center; gap: .35em; min-height: 40px; font-weight: 600; }
.ap-empty { margin: 0; color: var(--muted); font-size: 0.92rem; }
/* phones: the two panel titles stay above the fold at 375 x 667 (spec 7.2); the panel
   chip is hidden there, the coloured top rule still identifies the audience */
@media (max-width: 480px) {
  .aud-panel .ap-head .aud-chip { display: none; }
  .aud-panels { gap: 12px; }
  .aud-panel { padding: 10px 12px 6px; gap: 5px; }
  .aud-panel h3 { font-size: 1.08rem; }
  .course-row { padding: 6px 12px; }
  .course-row .track { margin-top: 3px; }
}

/* ---- page d'un public ---- */
.breadcrumb ol { list-style: none; margin: 2px 0 4px; padding: 0; display: flex; flex-wrap: wrap; align-items: center; gap: 2px 6px; font-size: 0.92rem; }
.breadcrumb li { display: inline-flex; align-items: center; gap: 6px; min-width: 0; }
.breadcrumb a { display: inline-flex; align-items: center; min-height: 32px; font-weight: 600; }
.breadcrumb [aria-current="page"] { color: var(--muted); font-weight: 600; }
.breadcrumb .sep { color: var(--muted); }
.year-heading { margin-top: 18px; }
.aud-exit { margin: 22px 0 6px; }
.aud-exit a { display: inline-flex; align-items: center; min-height: 44px; }

/* ---- cartes détaillées des cours (page d'un public) ---- */
.course-cards { display: grid; grid-template-columns: 1fr; gap: 14px; }
@media (min-width: 620px) { .course-cards { grid-template-columns: 1fr 1fr; } }
.course-card {
  display: flex; flex-direction: column; overflow: hidden;
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  text-decoration: none; color: var(--ink);
  box-shadow: 0 1px 2px rgba(0,0,0,.04);
  transition: transform .15s, box-shadow .15s;
}
.course-card:hover, .course-card:focus-visible { transform: translateY(-2px); box-shadow: 0 6px 18px rgba(0,0,0,.10); }
.cc-band { display: flex; align-items: center; justify-content: space-between; padding: 14px 16px; color: #fff; background: var(--course-default); }
.c-coeur .cc-band { background: var(--coeur); }
.c-neuro .cc-band { background: var(--neuro); }
.c-cellule .cc-band { background: var(--cellule); }
.cc-band svg { width: 46px; height: 46px; fill: none; stroke: #fff; stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
.cc-band svg .pulse { stroke-width: 2; opacity: .9; }
.cc-band svg .myelin { stroke-width: 4.5; opacity: .75; }
.cc-band svg .nucleolus { fill: #fff; stroke: none; }
.cc-code { font-size: 0.8rem; font-weight: 700; letter-spacing: .06em; background: #fff; color: var(--ink); border-radius: 999px; padding: 3px 10px; }
.cc-body { padding: 14px 16px 16px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.cc-body .cc-title { margin: 0; font-size: 1.25rem; color: var(--action-dark); }
.cc-desc { margin: 0; color: var(--muted); }
.cc-parts { margin: 0; padding-left: 18px; font-size: 0.92rem; }
.cc-meta { display: flex; justify-content: space-between; gap: 8px; font-size: 0.85rem; color: var(--muted); margin-top: auto; }
.cc-done { color: var(--ok); font-weight: 600; }
.course-card .track { height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; }
.course-card .fill { height: 100%; background: var(--ok); width: 0; }
.cc-go { align-self: flex-start; margin-top: 4px; font-weight: 700; color: var(--action); }
.c-coeur .cc-go { color: var(--coeur); }
.c-neuro .cc-go { color: var(--neuro); }
.c-cellule .cc-go { color: var(--cellule); }
.how { display: grid; grid-template-columns: 1fr; gap: 10px; margin: 22px 0 10px; }
@media (min-width: 620px) { .how { grid-template-columns: repeat(3, 1fr); } }
.how-item { display: flex; gap: 10px; align-items: flex-start; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; }
.how-item p { margin: 0; font-size: 0.92rem; }
.how-num { flex: 0 0 auto; width: 26px; height: 26px; border-radius: 50%; background: var(--arc-dark); color: #fff; font-weight: 700; display: inline-flex; align-items: center; justify-content: center; }

/* ---- page d'un cours : divulgation progressive ---- */
.start { display: grid; gap: 10px; }
.resume-series { width: 100%; text-align: left; }
.series-main { border: 2px solid var(--action); }
.series-main .name { font-size: 1.05rem; }
.parts { display: grid; gap: 12px; }
.part { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; }
.part h3 { margin: 0 0 2px; font-size: 1.02rem; color: var(--action-dark); }
.part .part-meta { margin: 0 0 8px; font-size: 0.88rem; color: var(--muted); }
.part .cards { gap: 8px; }
details { margin-top: 8px; }
details > summary {
  cursor: pointer; font-weight: 600; color: var(--action);
  display: list-item; list-style-position: inside; padding: 10px 0; /* 44 px target */
}
details > summary::marker { color: var(--action); }
details[open] > summary { margin-bottom: 6px; }
.by-format { margin-top: 14px; }
.all-line { margin: 12px 0 0; }

/* ---- page À propos ---- */
.about-aud h2 { margin-top: 18px; }
.about-list { margin: 0; padding-left: 20px; display: grid; gap: 8px; }
.about-list .al-title { font-weight: 700; }
.about-list .al-prov { display: block; color: var(--muted); font-size: 0.9rem; }

/* ---- types ajoutés le 2026-09-24 : two_tier, case, error_spot, short_answer ---- */
.type-help { margin: 0; }
/* two_tier: answer, then reason */
.tier { display: grid; gap: 8px; min-width: 0; }
.tier2 { margin-top: 6px; padding-top: 12px; border-top: 2px dashed var(--control-border); }
.tier2-lead { margin: 0 0 2px; font-size: 1.05rem; color: var(--ink); }
.opt.chosen:not(.correct):not(.wrong) { border-color: var(--action); box-shadow: inset 0 0 0 1px var(--action); background: var(--action-bg); }
.opt.chosen:not(.correct):not(.wrong) .letter { background: var(--action); color: #fff; }
.chosen-tag {
  margin-left: auto; align-self: center; flex: 0 0 auto; white-space: nowrap;
  font-size: 0.75rem; font-weight: 700; color: var(--action-dark); background: #fff;
  border: 1px solid var(--action); border-radius: 999px; padding: 1px 8px;
}
.feedback .misconception { margin-top: 10px; }
/* case: situation in stages */
.case { display: grid; gap: 14px; min-width: 0; }
.case-stage { display: grid; gap: 8px; min-width: 0; border-left: 4px solid var(--control-border); padding: 2px 0 4px 12px; }
.case-stage.correct { border-left-color: var(--ok); }
.case-stage.wrong { border-left-color: var(--ko); }
.case-stage h3 { margin: 0; font-size: 0.85rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; color: var(--muted); }
.case-add { margin: 0; padding: 8px 12px; background: #fff8e1; border-left: 4px solid #b26a00; border-radius: 6px; }
.case-q { margin: 0; font-weight: 600; font-size: 1.02rem; }
.case-controls { display: grid; gap: 8px; min-width: 0; }
.stage-feedback { padding: 10px 12px; border-radius: var(--radius); border-left: 4px solid var(--line); background: var(--bg); }
.stage-feedback.ok { border-left-color: var(--ok); }
.stage-feedback.ko { border-left-color: var(--ko); }
.stage-feedback .verdict { font-weight: 700; margin: 0 0 4px; }
.stage-feedback p { margin: 4px 0; }
.next-stage { justify-self: start; }
.feedback .stage-final { border-bottom: 1px solid var(--line); padding-bottom: 6px; margin-bottom: 6px; }
/* error_spot: sentences to select */
.error-spot { display: grid; gap: 8px; min-width: 0; }
.es-help { margin: 0; color: var(--muted); font-size: 0.92rem; font-weight: 600; }
.es-limit { margin: 0; color: var(--ko); font-weight: 600; font-size: 0.92rem; }
.es-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.es-seg {
  display: flex; gap: 10px; align-items: flex-start; width: 100%; text-align: left;
  background: #fff; border: 1px solid var(--control-border); border-radius: var(--radius);
  padding: 10px 12px; font-size: 1rem; line-height: 1.45; min-height: 48px; color: var(--ink);
}
.es-box {
  flex: 0 0 auto; width: 22px; height: 22px; margin-top: 1px; border: 2px solid var(--control-border);
  border-radius: 5px; display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.85rem; color: #fff; background: #fff;
}
.es-text { flex: 1; min-width: 0; }
/* selected sentence: filled box with "!", wavy underline (shape cues, not only colour) */
.es-seg[aria-pressed="true"] { border-color: var(--action); box-shadow: inset 0 0 0 1px var(--action); background: var(--action-bg); }
.es-seg[aria-pressed="true"] .es-box { background: var(--action); border-color: var(--action); }
.es-seg[aria-pressed="true"] .es-box::after { content: "!"; }
.es-seg[aria-pressed="true"] .es-text { text-decoration: underline wavy var(--ko); text-decoration-thickness: 1px; text-underline-offset: 4px; text-decoration-skip-ink: none; }
.es-seg:disabled { cursor: default; color: var(--ink); }
.es-seg .mark { flex: 0 0 auto; margin-top: 1px; }
.es-seg.found { border-color: var(--ok); box-shadow: inset 0 0 0 1px var(--ok); background: var(--ok-bg); }
.es-seg.false-alarm { border-color: var(--ko); box-shadow: inset 0 0 0 1px var(--ko); background: var(--ko-bg); }
.es-seg.missed { border: 2px dashed var(--ko); box-shadow: none; background: #fff; }
.mark-miss { background: #fff; color: var(--ko); border: 2px solid var(--ko); }
.es-fixes { margin: 4px 0 8px; padding-left: 20px; }
.es-fixes li { margin-bottom: 8px; }
.es-fixes p { margin: 2px 0; }
.feedback del { color: var(--ko); text-decoration-thickness: 1.5px; }
.feedback ins { color: var(--ok); text-decoration: none; font-weight: 600; }
/* short_answer: written explanation and self-assessment grid */
.short-answer { display: grid; gap: 8px; min-width: 0; }
.sa-label { font-weight: 600; }
.sa-note, .sa-min { margin: 0; }
.sa-input {
  display: block; width: 100%; min-height: 120px; resize: vertical; font: inherit; font-size: 1rem;
  line-height: 1.45; padding: 10px 12px; color: var(--ink); background: #fff;
  border: 2px solid var(--control-border); border-radius: var(--radius);
}
.sa-input:focus-visible { border-color: var(--action); }
.sa-input[readonly] { background: var(--bg); }
.sa-compare, .sa-validate { justify-self: start; }
.sa-model { background: #fff; border: 2px solid var(--action); border-radius: var(--radius); padding: 10px 14px; }
.sa-model h3 { margin: 0 0 4px; font-size: 1rem; color: var(--action-dark); }
.sa-model p { margin: 0; }
.sa-criteria { margin: 0; padding: 6px 12px 8px; min-width: 0; border: 1px solid var(--control-border); border-radius: var(--radius); }
.sa-criteria legend { font-weight: 600; padding: 0 4px; }
.sa-crit { display: flex; gap: 10px; align-items: flex-start; min-height: 44px; padding: 8px 0; cursor: pointer; }
.sa-crit + .sa-crit { border-top: 1px solid var(--line); }
.sa-crit input { flex: 0 0 auto; width: 24px; height: 24px; margin: 0; accent-color: var(--action); }
.sa-crit-body { flex: 1; min-width: 0; }
.sa-kind {
  display: inline-block; margin-right: 4px; padding: 1px 8px; border-radius: 999px;
  font-size: 0.75rem; font-weight: 700; letter-spacing: .03em; text-transform: uppercase;
  background: var(--action-bg); color: var(--action-dark);
}
.sa-kind.relation { background: var(--relation-bg); color: var(--relation-ink); }
.sa-crit.present { background: var(--ok-bg); }
.sa-crit.absent { background: var(--ko-bg); }
@media (max-width: 480px) {
  .next-stage, .sa-compare, .sa-validate { justify-self: stretch; width: 100%; }
}

/* ---- reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  .course-card, .course-card:hover, .course-card:focus-visible { transition: none; transform: none; }
  .progressbar div { transition: none; }
}