:root {
  --bg: #f6f5f1;
  --surface: #ffffff;
  --text: #1d2321;
  --muted: #5d6764;
  --line: #dcdcd4;
  --accent: #1f6f5c;
  --accent-text: #ffffff;
  --again: #b3412f;
  --hard: #a86a12;
  --good: #1f6f5c;
  --easy: #2d5ea8;
  --mastered: #1f6f5c;
  --learning: #8fc3b2;
  --due: #e0a03a;
  --new: #e4e3dc;
  --warn-bg: #fff3dc;
  --on-color: #ffffff;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #141816;
    --surface: #1e2421;
    --text: #e9ecea;
    --muted: #9aa5a1;
    --line: #333b38;
    --accent: #3fa58a;
    --accent-text: #0d1311;
    --again: #e0705d;
    --hard: #d6a04a;
    --good: #3fa58a;
    --easy: #6f9de0;
    --mastered: #3fa58a;
    --learning: #2f6657;
    --due: #c98b2b;
    --new: #2c3330;
    --warn-bg: #3a3020;
    --on-color: #0d1311;
    color-scheme: dark;}
}
:root[data-theme="dark"] {
    --bg: #141816;
    --surface: #1e2421;
    --text: #e9ecea;
    --muted: #9aa5a1;
    --line: #333b38;
    --accent: #3fa58a;
    --accent-text: #0d1311;
    --again: #e0705d;
    --hard: #d6a04a;
    --good: #3fa58a;
    --easy: #6f9de0;
    --mastered: #3fa58a;
    --learning: #2f6657;
    --due: #c98b2b;
    --new: #2c3330;
    --warn-bg: #3a3020;
    --on-color: #0d1311;
    color-scheme: dark;}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding-bottom: env(safe-area-inset-bottom);
}
.top {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; gap: 8px;
  padding: calc(env(safe-area-inset-top) + 8px) 16px 8px;
  background: var(--accent); color: var(--accent-text);
}
.top h1 { flex: 1; font-size: 18px; margin: 0; font-weight: 600; }
.icon-btn {
  background: none; border: 0; color: inherit; font-size: 22px;
  width: 40px; height: 40px; border-radius: 8px; cursor: pointer;
}
.icon-btn:focus-visible { outline: 2px solid var(--accent-text); }
main { max-width: 640px; margin: 0 auto; padding: 16px; }
h2 { font-size: 17px; margin: 20px 0 8px; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px; margin-bottom: 16px;
}
.card h2 { margin-top: 0; }
.hero .big { font-size: 22px; font-weight: 600; margin: 0 0 12px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.warn { background: var(--warn-bg); padding: 8px 12px; border-radius: 8px; }
button, .file {
  font: inherit; color: var(--text); background: var(--surface);
  border: 1px solid var(--line); border-radius: 10px;
  padding: 12px 16px; cursor: pointer; text-align: left; min-height: 48px;
}
button:disabled { opacity: .45; cursor: default; }
button small { display: block; color: var(--muted); font-size: 13px; }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); font-weight: 600; }
button.primary small { color: inherit; opacity: .8; }
button.danger { color: var(--again); }
button.link { border: 0; background: none; color: var(--accent); padding: 8px 0; min-height: 0; text-decoration: underline; }
.actions { display: grid; gap: 10px; margin-bottom: 16px; }
.actions.secondary { grid-template-columns: 1fr 1fr; }
.actions.secondary button { font-size: 14px; }
.goal { height: 10px; border-radius: 5px; background: var(--new); overflow: hidden; }
.goal-fill { height: 100%; background: var(--accent); }
.bar { display: flex; height: 6px; border-radius: 3px; background: var(--new); overflow: hidden; margin-top: 6px; }
.b-mastered { background: var(--mastered); }
.b-learning { background: var(--learning); }
.b-due { background: var(--due); }
.legend { display: flex; flex-wrap: wrap; gap: 12px; font-size: 13px; color: var(--muted); }
.legend span::before { content: ""; display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 5px; vertical-align: -1px; }
.l-mastered::before { background: var(--mastered); }
.l-learning::before { background: var(--learning); }
.l-due::before { background: var(--due); }
.l-new::before { background: var(--new); }
.chap { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin-bottom: 8px; }
.row { display: flex; align-items: center; gap: 10px; }
.row input[type=checkbox] { width: 22px; height: 22px; flex: none; accent-color: var(--accent); }
.chap-name { flex: 1; min-width: 0; }
.count { color: var(--muted); font-size: 14px; white-space: nowrap; }
.count em { color: var(--due); font-style: normal; font-weight: 600; }
.subs { margin-top: 8px; border-top: 1px solid var(--line); padding-top: 4px; }
.sub { padding: 6px 0 6px 12px; font-size: 15px; }
.toggle { font-size: 14px; }
.sticky {
  position: sticky; bottom: 0; background: var(--bg); padding: 12px 0 calc(12px + env(safe-area-inset-bottom));
  border-top: 1px solid var(--line); display: grid; gap: 8px;
}
.sticky p { margin: 0; }
.progress-line { display: flex; justify-content: space-between; gap: 12px; color: var(--muted); font-size: 14px; margin-bottom: 8px; }
.progress-line span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.flash {
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px;
  padding: 20px; min-height: 240px; margin-bottom: 16px;
}
.codes { display: flex; flex-wrap: wrap; gap: 6px; font-size: 12px; color: var(--muted); }
.codes span { border: 1px solid var(--line); border-radius: 6px; padding: 1px 6px; }
.codes .tag { border: 0; font-weight: 600; }
.tag.new { color: var(--easy); }
.tag.again { color: var(--again); }
.term { font-size: 26px; margin: 16px 0; overflow-wrap: anywhere; }
.def { font-size: 18px; margin: 0; border-top: 1px solid var(--line); padding-top: 16px; }
.reveal { width: 100%; text-align: center; }
.grade { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.grade.four { grid-template-columns: repeat(4, 1fr); }
.grade button { text-align: center; color: var(--on-color); border: 0; font-weight: 600; padding: 14px 4px; }
.grade button small { color: inherit; opacity: .75; font-weight: 400; }
.grade .again { background: var(--again); }
.grade .hard { background: var(--hard); }
.grade .good { background: var(--good); }
.grade .easy { background: var(--easy); }
.undo { display: block; margin: 12px auto 0; font-size: 14px; }
.form label { display: grid; grid-template-columns: minmax(0, 1fr); gap: 4px; margin-bottom: 12px; }
.form input[type=number], .form input[type=time], .form select {
  font: inherit; padding: 10px; border-radius: 8px; border: 1px solid var(--line);
  background: var(--bg); color: var(--text); width: 100%; min-width: 0;
}
.form button { width: 100%; margin-bottom: 10px; }
.file { display: block; position: relative; margin-bottom: 10px; }
.file input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.prow { margin-bottom: 12px; }
.hist { display: flex; align-items: flex-end; gap: 4px; height: 110px; }
.hcol { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; font-size: 11px; color: var(--muted); }
.hcol small { min-height: 14px; }
.hbar { width: 100%; background: var(--accent); border-radius: 3px 3px 0 0; min-height: 2px; }
.hard { margin: 0; padding-left: 20px; }
.prose p { margin: 0 0 12px; }
.prose h2 { font-size: 1rem; margin: 18px 0 6px; }
.prose h2:first-child { margin-top: 0; }
#toast {
  position: fixed; left: 16px; right: 16px; bottom: calc(16px + env(safe-area-inset-bottom));
  max-width: 600px; margin: 0 auto; background: var(--text); color: var(--bg);
  padding: 12px 16px; border-radius: 10px; z-index: 10;
}
@media (max-width: 380px) {
  .grade.four { grid-template-columns: 1fr 1fr; }
  .actions.secondary { grid-template-columns: 1fr; }
}
.modal { position: fixed; inset: 0; z-index: 20; background: rgba(0,0,0,.45); display: grid; place-items: center; padding: 16px; }
.modal-box { background: var(--surface); color: var(--text); border-radius: 14px; padding: 20px; max-width: 420px; width: 100%; }
.modal-box p { margin: 0 0 16px; }
.modal-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.modal-actions button { text-align: center; }
button:focus-visible, .file:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }
.wide { width: 100%; margin-bottom: 16px; text-align: center; }
.facts { margin: 0; padding-left: 20px; display: grid; gap: 6px; }
.form input[type=text] { font: inherit; padding: 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--bg); color: var(--text); width: 100%; min-width: 0; }
.copy-fallback { width: 100%; height: 120px; font: 12px/1.4 ui-monospace, monospace; margin-top: 12px; }
a.link { color: var(--accent); }

/* Lexique */
.lex-search { position: relative; margin-bottom: 8px; }
.lex-search input { font: inherit; font-size: 17px; width: 100%; min-width: 0; padding: 12px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); color: var(--text); }
.sugg { position: absolute; left: 0; right: 0; top: 100%; z-index: 10; margin: 4px 0 0; padding: 4px 0; list-style: none; background: var(--surface); border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 6px 18px rgba(0,0,0,.15); max-height: 60vh; overflow-y: auto; }
.sugg li { padding: 10px 12px; cursor: pointer; }
.sugg li[aria-selected=true], .sugg li[data-i]:hover { background: var(--bg); }
.sugg li.none { color: var(--muted); cursor: default; }
button.lex-item { display: flex; align-items: center; gap: 10px; width: 100%; text-align: left; background: none; border: 0; padding: 6px 0; color: var(--text); font: inherit; }
button.lex-item.open .chap-name { color: var(--accent); }
.terms { list-style: none; margin: 4px 0 8px; padding: 0 0 0 8px; border-left: 3px solid var(--learning); }
button.term { display: block; background: none; border: 0; padding: 8px 4px; min-height: 40px; width: 100%; text-align: left; font: inherit; color: var(--accent); }
.def-box { max-height: 85vh; overflow-y: auto; }
.def-box h2 { margin: 0 0 10px; }
.def-codes { list-style: none; padding: 0; margin: 0 0 16px; }

/* QCM d'échauffement */
.qcm .hint { margin: 0 0 12px; font-weight: 600; }
.qcm .def { border-top: 0; padding-top: 0; }
.options { display: grid; gap: 8px; margin-bottom: 16px; }
.opt { display: flex; align-items: center; gap: 12px; width: 100%; overflow-wrap: anywhere; }
.opt small { flex: none; display: inline-grid; place-items: center; width: 24px; height: 24px; border: 1px solid var(--line); border-radius: 6px; }
.opt:disabled { opacity: 1; }
.opt.right { border: 2px solid var(--good); font-weight: 600; }
.opt.wrong { border: 2px solid var(--again); text-decoration: line-through; }
.opt.dim { color: var(--muted); }
.feedback { border-left: 4px solid var(--good); padding: 4px 12px; margin-bottom: 16px; }
.feedback.ko { border-left-color: var(--again); }
.feedback p { margin: 0 0 8px; }

/* Signalement d'une erreur */
.flash, .def-box { position: relative; }
.flash .codes, .flash .hint, .def-box h2 { padding-right: 44px; }
.report-btn {
  position: absolute; top: 8px; right: 8px; min-height: 0; width: 40px; height: 40px; padding: 0;
  display: grid; place-items: center; font-size: 20px; line-height: 1;
  color: var(--hard); background: none; border: 0; border-radius: 8px;
}
.report-btn:hover { background: var(--bg); }
.report-box h2 { margin: 0 0 8px; }
.report-box fieldset { border: 0; padding: 0; margin: 0 0 12px; display: grid; gap: 4px; }
.report-box .radio { display: flex; align-items: center; gap: 10px; min-height: 40px; }
.report-box .radio input { width: 20px; height: 20px; margin: 0; accent-color: var(--accent); }
.report-box label:not(.radio) { display: grid; gap: 4px; margin-bottom: 16px; }
.report-box input[type=text], .report-box textarea { font: inherit; padding: 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--bg); color: var(--text); width: 100%; min-width: 0; }

/* Chapitres vus en cours */
h2.section { font-size: 17px; margin: 8px 0 4px; }
.tag-open { font-size: 12px; font-weight: 600; color: var(--accent); white-space: nowrap; }

/* Mots-clés à vérifier au verso */
.def mark { background: none; color: inherit; font-weight: 700; text-decoration: underline; text-decoration-color: var(--due); text-decoration-thickness: 2px; text-underline-offset: 3px; }
.keys { border: 0; border-top: 1px solid var(--line); margin: 16px 0 0; padding: 12px 0 0; display: grid; gap: 2px; }
.keys legend { padding: 0; font-size: 14px; color: var(--muted); }
.keys label { display: flex; align-items: center; gap: 10px; min-height: 40px; }
.keys input { width: 22px; height: 22px; margin: 0; flex: none; accent-color: var(--accent); }
.center { text-align: center; }