:root {
  --bg: #f6f7fb; --card: #ffffff; --ink: #1c2333; --muted: #667085;
  --accent: #1a7f4e; --accent-soft: #e6f4ec; --locked: #c7ccd8;
  --warn: #b54708; --warn-soft: #fef0e6; --err: #b42318; --err-soft: #fdeceb;
  --blue: #175cd3; --blue-soft: #eaf1fd; --radius: 12px;
  --shadow: 0 1px 3px rgba(16,24,40,.08), 0 1px 2px rgba(16,24,40,.06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151c; --card: #1b2029; --ink: #e6e9f0; --muted: #98a2b3;
    --accent: #3ecf8e; --accent-soft: #12291d; --locked: #3a4150;
    --warn: #f79009; --warn-soft: #2b2013; --err: #f04438; --err-soft: #2b1615;
    --blue: #6ea8ff; --blue-soft: #14203a;
    --shadow: 0 1px 3px rgba(0,0,0,.4);
  }
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.6 -apple-system, "Segoe UI", Roboto, sans-serif; background: var(--bg); color: var(--ink); }
#topbar { display: flex; align-items: center; gap: 1.2rem; padding: .7rem 1.2rem; background: var(--card); box-shadow: var(--shadow); position: sticky; top: 0; z-index: 10; }
.brand { font-weight: 700; cursor: pointer; }
#topbar nav { display: flex; gap: 1rem; flex: 1; }
#topbar a { color: var(--muted); text-decoration: none; font-size: .95rem; }
#topbar a:hover { color: var(--ink); }
#xp-badge { font-size: .9rem; color: var(--accent); font-weight: 600; white-space: nowrap; }
#app { max-width: 980px; margin: 1.5rem auto 4rem; padding: 0 1rem; }
.card { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 1.2rem 1.5rem; margin-bottom: 1rem; }
h1 { font-size: 1.5rem; margin: .2rem 0 1rem; }
h2 { font-size: 1.15rem; margin: 1.2rem 0 .5rem; }
h3 { font-size: 1rem; margin: 1rem 0 .4rem; }
.muted { color: var(--muted); font-size: .92rem; }
button, .btn {
  font: inherit; border: 0; border-radius: 8px; padding: .55rem 1.1rem; cursor: pointer;
  background: var(--accent); color: #fff; font-weight: 600; text-decoration: none; display: inline-block;
}
button.secondary, .btn.secondary { background: var(--blue-soft); color: var(--blue); }
button.ghost { background: transparent; color: var(--muted); }
button:disabled { background: var(--locked); cursor: not-allowed; }
.progress-track { height: 10px; background: var(--bg); border-radius: 5px; overflow: hidden; }
.progress-fill { height: 100%; background: var(--accent); border-radius: 5px; transition: width .4s; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1rem; }
.stat-row { display: flex; gap: 1rem; flex-wrap: wrap; }
.stat { flex: 1; min-width: 130px; background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: .9rem 1.1rem; }
.stat .n { font-size: 1.6rem; font-weight: 700; }
.stat .l { font-size: .85rem; color: var(--muted); }
/* Carte des compétences */
.module-block { margin-bottom: 1.4rem; }
.module-head { display: flex; align-items: baseline; gap: .8rem; margin-bottom: .5rem; }
.module-head h2 { margin: 0; }
.skill-chip {
  display: flex; align-items: center; gap: .6rem; padding: .6rem .9rem; border-radius: 10px;
  background: var(--card); box-shadow: var(--shadow); cursor: pointer; border: 2px solid transparent;
  color: var(--ink); text-decoration: none;
}
.skill-chip:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }
.skill-chip:hover { border-color: var(--accent); }
.skill-chip.locked { opacity: .55; cursor: not-allowed; }
.skill-chip.locked:hover { border-color: transparent; }
.skill-chip .dot { width: 12px; height: 12px; border-radius: 50%; flex-shrink: 0; }
.dot.locked { background: var(--locked); }
.dot.available { background: var(--blue); }
.dot.in-progress { background: var(--warn); }
.dot.fragile { background: var(--err); }
.dot.mastered { background: var(--accent); }
.legend { display: flex; gap: 1.2rem; flex-wrap: wrap; font-size: .85rem; color: var(--muted); margin: .6rem 0 1.2rem; }
.legend span { display: inline-flex; align-items: center; gap: .4rem; }
/* Fiche de cours */
.lesson h2 { color: var(--accent); }
.box { border-radius: 10px; padding: .8rem 1.1rem; margin: .8rem 0; }
.box.why { background: var(--blue-soft); }
.box.pitfall { background: var(--warn-soft); }
.box.mistake { background: var(--err-soft); }
.box.practice { background: var(--accent-soft); }
.box.further { background: var(--bg); border: 1px dashed var(--muted); }
.box .box-title { font-weight: 700; font-size: .85rem; text-transform: uppercase; letter-spacing: .04em; margin-bottom: .3rem; }
.formula { font-family: ui-monospace, "SF Mono", Menlo, monospace; background: var(--bg); padding: .1rem .45rem; border-radius: 5px; font-size: .92em; }
table.mini { border-collapse: collapse; margin: .6rem 0; font-size: .9rem; }
table.mini td, table.mini th { border: 1px solid var(--locked); padding: .25rem .6rem; text-align: center; }
table.mini th { background: var(--bg); }
/* Exercices */
.exo-progress { font-size: .85rem; color: var(--muted); margin-bottom: .6rem; }
.choice { display: block; width: 100%; text-align: left; background: var(--card); color: var(--ink);
  border: 2px solid var(--locked); border-radius: 10px; padding: .7rem 1rem; margin: .5rem 0; font-weight: 400; }
.choice:hover { border-color: var(--blue); }
.choice.sel { border-color: var(--blue); background: var(--blue-soft); }
.choice.ok { border-color: var(--accent); background: var(--accent-soft); }
.choice.ko { border-color: var(--err); background: var(--err-soft); }
input.answer { font: inherit; width: 100%; padding: .6rem .9rem; border-radius: 8px; border: 2px solid var(--locked);
  background: var(--card); color: var(--ink); font-family: ui-monospace, Menlo, monospace; }
input.answer:focus { outline: none; border-color: var(--blue); }
.feedback { border-radius: 10px; padding: .8rem 1.1rem; margin: .8rem 0; }
.feedback.ok { background: var(--accent-soft); }
.feedback.ko { background: var(--err-soft); }
.feedback.info { background: var(--blue-soft); }
.manip-steps li { margin: .35rem 0; }
.tag { font-size: .75rem; padding: .1rem .55rem; border-radius: 99px; background: var(--bg); color: var(--muted); }
.tag.generated { background: var(--accent-soft); color: var(--accent); margin-left: .35rem; overflow-wrap: anywhere; }
.variant-btn { margin: .35rem 0 .6rem; padding: .4rem .75rem; font-size: .9rem; }
.exercise-tools { display: flex; align-items: center; gap: .75rem; flex-wrap: wrap; margin-bottom: .2rem; }
.exercise-tools a { color: var(--blue); }
.resume-banner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.revision-card p { margin-top: 0; }
.weak-list { border-top: 1px solid var(--locked); }
.weak-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .7rem 0; border-bottom: 1px solid var(--locked); }
.weak-row span { display: flex; gap: .8rem; flex-wrap: wrap; }
.weak-row a { color: var(--blue); }
.technical-limits summary { cursor: pointer; font-weight: 700; }
.technical-limits details[open] summary { margin-bottom: 1rem; }
.footer-note { text-align: center; color: var(--muted); font-size: .8rem; margin-top: 2rem; }
.page-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-bottom: 1rem; }
.page-head h1 { margin-bottom: .25rem; }
.back-link { display: inline-block; color: var(--blue); margin-bottom: .8rem; }
.practical-list { display: grid; gap: .75rem; margin-bottom: 1rem; }
.practical-item {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 1rem; align-items: center;
  background: var(--card); border: 1px solid transparent; border-radius: 8px; box-shadow: var(--shadow); padding: 1rem 1.2rem;
}
.practical-item h2 { margin: .35rem 0 .2rem; }
.practical-item p { margin: 0; color: var(--muted); }
.practical-item.is-locked { opacity: .65; }
.practical-item-meta { display: grid; justify-items: end; gap: .35rem; min-width: 150px; color: var(--muted); font-size: .86rem; }
.compact-note li { margin-bottom: .35rem; }
.status-pill { display: inline-flex; align-items: center; min-height: 30px; padding: .2rem .65rem; border-radius: 8px; font-size: .82rem; font-weight: 700; background: var(--blue-soft); color: var(--blue); }
.status-reussi { background: var(--accent-soft); color: var(--accent); }
.status-a-corriger { background: var(--err-soft); color: var(--err); }
.practical-run-meta { display: grid; justify-items: end; gap: .25rem; color: var(--muted); font-size: .82rem; }
.workflow {
  display: grid; grid-template-columns: repeat(7, minmax(108px, 1fr)); gap: .35rem; list-style: none;
  padding: 0 0 .5rem; margin: 0 0 1rem; overflow-x: auto;
}
.workflow li { min-height: 70px; padding: .55rem; border-top: 3px solid var(--locked); background: var(--card); font-size: .78rem; }
.workflow li span { display: block; color: var(--muted); }
.workflow li strong { display: block; line-height: 1.3; }
.workflow li.done { border-top-color: var(--accent); }
.practical-file-head, .report-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; flex-wrap: wrap; }
.practical-file-head h2 { margin-top: 0; }
.practical-file-head code { overflow-wrap: anywhere; color: var(--blue); }
.button-row { display: flex; gap: .55rem; align-items: center; flex-wrap: wrap; margin-top: .8rem; }
.file-picker { display: inline-block; font-weight: 700; margin: .3rem 0 .6rem; }
#practical-import { display: block; max-width: 100%; color: var(--ink); }
.correction-report { border-top: 4px solid var(--err); }
.correction-report.report-pass { border-top-color: var(--accent); }
.report-head h2 { margin-top: 0; }
.report-head p { margin: 0; }
.score { min-width: 82px; text-align: right; font-size: 2rem; font-weight: 750; line-height: 1; color: var(--accent); }
.score small { color: var(--muted); font-size: .85rem; }
.criterion-list { border-top: 1px solid var(--locked); }
.criterion { padding: .9rem 0; border-bottom: 1px solid var(--locked); }
.criterion p { margin: .35rem 0; }
.criterion-head { display: flex; justify-content: space-between; gap: .75rem; flex-wrap: wrap; }
.criterion-head code { color: var(--err); overflow-wrap: anywhere; }
.hint { color: var(--blue); }
.passed-details { margin-top: 1rem; }
.passed-details summary { cursor: pointer; font-weight: 700; }
.attempt-table { border-top: 1px solid var(--locked); }
.attempt-row { display: grid; grid-template-columns: 1fr .6fr 1fr 1.2fr; gap: .7rem; padding: .6rem 0; border-bottom: 1px solid var(--locked); align-items: center; }
/* Flashcards */
.flashcard-list { display: grid; gap: .65rem; }
.flashcard-item {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 1rem;
  background: var(--card); border-radius: 8px; box-shadow: var(--shadow); padding: .9rem 1.1rem;
}
.flashcard-item h2 { margin: .25rem 0 .1rem; }
.flashcard-item p { margin: 0; color: var(--muted); font-size: .88rem; }
.flashcard-item.is-locked { opacity: .65; }
.flashcard-head { align-items: center; }
.flashcard-head h1 { margin-top: .35rem; }
.study-card {
  min-height: 340px; display: flex; flex-direction: column; justify-content: center; align-items: flex-start;
  background: var(--card); border: 1px solid var(--locked); border-radius: 8px; padding: clamp(1.2rem, 4vw, 2.5rem);
}
.flashcard-question { max-width: 760px; margin: 0 0 1.5rem; font-size: 1.25rem; font-weight: 700; line-height: 1.5; overflow-wrap: anywhere; }
.flashcard-answer { width: 100%; border-top: 3px solid var(--accent); }
.flashcard-answer h2 { margin-top: 1rem; }
.flashcard-answer p { overflow-wrap: anywhere; }
.flashcard-answer details { border-top: 1px solid var(--locked); padding-top: .8rem; }
.flashcard-answer summary { cursor: pointer; font-weight: 700; }
.flashcard-nav { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: .7rem; margin-top: .8rem; }
.flashcard-nav a { color: var(--blue); text-align: center; }
.flashcard-nav #previous { justify-self: start; }
.flashcard-nav #next-card { justify-self: end; }
.review-plan { display: flex; align-items: center; gap: .65rem; flex-wrap: wrap; justify-content: flex-end; }
.review-head { align-items: center; }
.review-counter { display: grid; justify-items: end; gap: .15rem; color: var(--muted); }
.review-counter strong { color: var(--ink); font-size: 1.15rem; }
.review-card { gap: 1rem; }
.review-reason {
  margin: 0 0 .35rem; padding: .25rem .65rem; border-radius: 8px;
  background: var(--blue-soft); color: var(--blue); font-size: .88rem; font-weight: 700;
}
.rating-grid { width: 100%; display: grid; grid-template-columns: repeat(4, minmax(112px, 1fr)); gap: .65rem; margin-top: .85rem; }
.rating-btn { min-height: 48px; }
.rating-again { background: var(--err); }
.rating-hard { background: var(--warn); }
.rating-good { background: var(--accent); }
.rating-easy { background: var(--blue); }
.review-actions { display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-top: .8rem; }
.review-actions a { color: var(--blue); }
.review-empty, .review-finish { text-align: left; }
button:focus-visible, .btn:focus-visible, a:focus-visible, input:focus-visible, summary:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }
@media (max-width: 680px) {
  #topbar { align-items: flex-start; flex-wrap: wrap; }
  #topbar nav { order: 3; width: 100%; flex-wrap: wrap; }
  #xp-badge { margin-left: auto; }
  .card { padding: 1rem; }
  .practical-item { grid-template-columns: 1fr; }
  .practical-item-meta { justify-items: start; min-width: 0; }
  .practical-run-meta { justify-items: start; }
  .attempt-row { grid-template-columns: 1fr 1fr; }
  .weak-row { align-items: flex-start; flex-direction: column; }
  .flashcard-item { grid-template-columns: 1fr; }
  .flashcard-item .btn { width: 100%; text-align: center; }
  .study-card { min-height: 300px; }
  .flashcard-question { font-size: 1.08rem; }
  .flashcard-nav { grid-template-columns: 1fr 1fr; }
  .flashcard-nav a { grid-column: 1 / -1; grid-row: 2; }
  .review-plan { justify-content: stretch; width: 100%; }
  .review-plan .btn { width: 100%; text-align: center; }
  .review-counter { justify-items: start; width: 100%; }
  .rating-grid { grid-template-columns: 1fr 1fr; }
  .review-actions { align-items: stretch; flex-direction: column; }
  .review-actions button, .review-actions a { width: 100%; text-align: center; }
  .button-row > button, .button-row > .btn { width: 100%; text-align: center; }
}
.recommendation-card { border-left: 4px solid var(--primary, #2563eb); }
.recommendation-card details { margin-top: 1rem; }
.path-summary, .path-action-window { border-left: 4px solid var(--primary, #2563eb); }
.path-progress-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .75rem; margin: 1rem 0; }
.objective-form { display: grid; gap: .65rem; max-width: 760px; }
.objective-form label { font-weight: 650; }
.objective-form select, .objective-form input[type="date"] { min-height: 44px; padding: .65rem; border: 1px solid var(--border); border-radius: .5rem; background: var(--surface); color: inherit; }
@media (max-width: 600px) { .path-progress-grid { grid-template-columns: 1fr 1fr; } }

/* UX V1 — architecture, hiérarchie et navigation (identité visuelle provisoire). */
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 100; padding: .6rem 1rem; background: var(--ink); color: var(--card); }
.skip-link:focus { top: 1rem; }
#topbar { padding: .75rem max(1rem, calc((100vw - 1180px) / 2)); border-bottom: 1px solid var(--locked); box-shadow: none; }
.brand { font-weight: 750; color: var(--ink) !important; letter-spacing: -.02em; white-space: nowrap; text-decoration: none; }
#topbar nav a.active { color: var(--ink); font-weight: 700; box-shadow: inset 0 -2px var(--accent); }
.utility-nav { display: flex; gap: .8rem; white-space: nowrap; }
#mobile-menu { display: none; margin-left: auto; }
#app { max-width: 920px; margin: 2.5rem auto 5rem; padding: 0 1.25rem; }
.page-intro { max-width: 700px; margin-bottom: 1.75rem; }
.page-intro h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); letter-spacing: -.035em; margin: 0; }
.page-intro p:last-child { color: var(--muted); margin: .35rem 0 0; }
.eyebrow { margin: 0 0 .2rem; color: var(--accent); font-size: .78rem; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
.progress-fill.caution { background: var(--warn); }
.primary-action { padding: clamp(1.25rem, 4vw, 2rem); }
.primary-action h3 { font-size: clamp(1.3rem, 3vw, 1.7rem); margin-top: .2rem; }
.activity-meta { display: flex; flex-wrap: wrap; gap: .5rem 1rem; color: var(--muted); font-size: .9rem; }
.activity-meta span + span::before { content: "·"; margin-right: 1rem; }
.adjustments { display: flex; flex-wrap: wrap; gap: .25rem; margin-top: .8rem; }
.adjustments button { padding: .35rem .5rem; font-weight: 500; text-decoration: underline; text-underline-offset: 3px; }
.today-context { border-top: 1px solid var(--locked); margin-top: 2rem; }
.context-line { display: flex; justify-content: space-between; gap: 1rem; padding: .7rem 0; border-bottom: 1px solid var(--locked); }
.context-line a, .manual-link a { color: var(--blue); }
.manual-link { color: var(--muted); margin-top: 1.25rem; }
.mastery-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.4rem; }
.mastery-item { display: grid; grid-template-columns: 1fr auto; gap: .35rem .75rem; }
.mastery-item .progress-track, .mastery-item small { grid-column: 1 / -1; }
.mastery-item small, .weak-row small { display: block; color: var(--muted); }
.search-label { display: block; font-weight: 700; margin-bottom: .4rem; }
.search-input { width: 100%; min-height: 52px; padding: .7rem 1rem; border: 2px solid var(--locked); border-radius: 10px; background: var(--card); color: var(--ink); font: inherit; font-size: 1.05rem; }
.search-input:focus { border-color: var(--blue); outline: 3px solid var(--blue-soft); }
.search-results { list-style: none; padding: 0; margin: 1rem 0; border-top: 1px solid var(--locked); }
.search-results li { border-bottom: 1px solid var(--locked); }
.search-results a { display: flex; justify-content: space-between; gap: 1rem; padding: .8rem .2rem; color: var(--ink); text-decoration: none; }
.search-results small { color: var(--muted); }
.empty-state { padding: 1.5rem; color: var(--muted); }
.legacy-data { display: none !important; }
@media (max-width: 680px) {
  #topbar { align-items: center; flex-wrap: wrap; }
  #mobile-menu { display: inline-block; }
  #topbar nav { display: none; order: 3; width: 100%; flex-direction: column; gap: 0; border-top: 1px solid var(--locked); }
  #topbar nav.open { display: flex; }
  #topbar nav a { min-height: 48px; display: flex; align-items: center; border-bottom: 1px solid var(--locked); }
  #topbar nav a.active { box-shadow: inset 3px 0 var(--accent); padding-left: .75rem; }
  .utility-nav { margin-left: auto; }
  .utility-nav a:first-child { display: none; }
  #app { margin-top: 1.5rem; }
  .mastery-grid { grid-template-columns: 1fr; }
  .context-line { flex-direction: column; gap: .2rem; }
  .adjustments { flex-direction: column; align-items: flex-start; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; } }

/* Design System V1 — couche sémantique. Les alias historiques restent temporaires. */
:root {
  color-scheme: light;
  --color-bg-primary: #f5f6f2; --color-bg-secondary: #ecefe9;
  --color-surface: #fffefa; --color-surface-elevated: #ffffff;
  --color-text-primary: #18201d; --color-text-secondary: #56615c; --color-text-muted: #717c76;
  --color-border-subtle: #dce1dc; --color-border-strong: #aeb8b1;
  --color-action: #176b52; --color-action-hover: #11513e; --color-action-soft: #e2f1eb;
  --color-info: #315f8c; --color-info-soft: #e8f0f7;
  --color-success: #176b52; --color-success-soft: #e2f1eb;
  --color-warning: #8a5612; --color-warning-soft: #f8eedb;
  --color-error: #a13b35; --color-error-soft: #fae9e6;
  --color-focus: #2977bd;
  --space-1: .25rem; --space-2: .5rem; --space-3: .75rem; --space-4: 1rem;
  --space-5: 1.5rem; --space-6: 2rem; --space-7: 3rem; --space-8: 4rem;
  --radius-control: .5rem; --radius-surface: .75rem; --radius-modal: 1rem;
  --shadow-surface: 0 1px 2px rgba(23, 35, 29, .05), 0 10px 30px rgba(23, 35, 29, .035);
  --shadow-floating: 0 18px 50px rgba(23, 35, 29, .14);
  --motion-fast: 120ms; --motion-standard: 180ms; --ease-standard: cubic-bezier(.2, 0, 0, 1);
  --content-wide: 74rem; --content-reading: 44rem;
  --bg: var(--color-bg-primary); --card: var(--color-surface); --ink: var(--color-text-primary);
  --muted: var(--color-text-secondary); --accent: var(--color-action); --accent-soft: var(--color-action-soft);
  --locked: var(--color-border-strong); --warn: var(--color-warning); --warn-soft: var(--color-warning-soft);
  --err: var(--color-error); --err-soft: var(--color-error-soft); --blue: var(--color-info); --blue-soft: var(--color-info-soft);
  --radius: var(--radius-surface); --shadow: var(--shadow-surface); --border: var(--color-border-subtle); --surface: var(--color-surface);
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --color-bg-primary: #101512; --color-bg-secondary: #171e1a;
  --color-surface: #1b231f; --color-surface-elevated: #222c27;
  --color-text-primary: #edf1ed; --color-text-secondary: #b9c3bd; --color-text-muted: #96a29a;
  --color-border-subtle: #303b35; --color-border-strong: #4a5850;
  --color-action: #6bc7a3; --color-action-hover: #86d5b6; --color-action-soft: #17372c;
  --color-info: #8db7de; --color-info-soft: #1a3042;
  --color-success: #6bc7a3; --color-success-soft: #17372c;
  --color-warning: #e0ad5d; --color-warning-soft: #382b18;
  --color-error: #ef8f87; --color-error-soft: #3d211f;
  --color-focus: #83bff2;
  --shadow-surface: 0 1px 2px rgba(0,0,0,.3), 0 12px 32px rgba(0,0,0,.12);
  --shadow-floating: 0 20px 60px rgba(0,0,0,.42);
}
html { background: var(--color-bg-primary); scroll-behavior: smooth; }
body { min-height: 100vh; font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; letter-spacing: -.005em; }
body::before { content: ""; position: fixed; inset: 0 0 auto; height: 22rem; pointer-events: none; z-index: -1; background: radial-gradient(ellipse at 50% -35%, color-mix(in srgb, var(--color-action) 10%, transparent), transparent 70%); }
#topbar { min-height: 4rem; padding-block: .65rem; background: color-mix(in srgb, var(--color-surface) 92%, transparent); border-color: var(--color-border-subtle); backdrop-filter: blur(16px); }
.brand { display: inline-flex; align-items: center; gap: .6rem; font-family: Georgia, "Times New Roman", serif; font-size: 1.08rem; }
.brand::before { content: "EA"; display: grid; place-items: center; width: 2rem; height: 2rem; border-radius: .45rem; background: var(--color-action); color: var(--color-surface); font: 700 .7rem/1 ui-sans-serif, sans-serif; letter-spacing: .05em; }
#topbar nav { gap: var(--space-1); }
#topbar nav a, .utility-nav a { min-height: 2.5rem; display: inline-flex; align-items: center; padding: .35rem .65rem; border-radius: var(--radius-control); transition: color var(--motion-fast), background var(--motion-fast); }
#topbar a:hover { background: var(--color-bg-secondary); }
#topbar nav a.active { color: var(--color-action); box-shadow: none; background: var(--color-action-soft); }
#app { max-width: 64rem; margin-top: var(--space-7); }
h1, h2, h3 { line-height: 1.22; letter-spacing: -.025em; text-wrap: balance; }
h1 { font-size: clamp(2rem, 4vw, 2.75rem); font-weight: 690; }
h2 { font-size: 1.25rem; font-weight: 680; }
h3 { font-size: 1.05rem; font-weight: 680; }
p, li { text-wrap: pretty; }
.page-intro { max-width: var(--content-reading); margin-bottom: var(--space-6); }
.page-intro h1 { font-family: Georgia, "Times New Roman", serif; font-weight: 600; letter-spacing: -.035em; }
.eyebrow { color: var(--color-action); letter-spacing: .11em; }
.card, .stat, .practical-item, .flashcard-item { background: var(--color-surface); border: 1px solid var(--color-border-subtle); box-shadow: none; }
.card { padding: clamp(1.15rem, 3vw, 1.75rem); margin-bottom: var(--space-4); }
.card:hover { border-color: color-mix(in srgb, var(--color-border-strong) 70%, transparent); }
.primary-action, .recommendation-card { position: relative; overflow: hidden; border: 1px solid color-mix(in srgb, var(--color-action) 42%, var(--color-border-subtle)); border-left: 4px solid var(--color-action); background: linear-gradient(115deg, var(--color-surface) 50%, var(--color-action-soft)); box-shadow: var(--shadow-surface); }
.primary-action::after { content: ""; position: absolute; width: 13rem; height: 13rem; right: -8rem; top: -8rem; border: 1px solid color-mix(in srgb, var(--color-action) 20%, transparent); border-radius: 50%; }
button, .btn { min-height: 44px; border: 1px solid transparent; border-radius: var(--radius-control); padding: .58rem 1rem; background: var(--color-action); color: #fff; transition: background var(--motion-fast), border-color var(--motion-fast); }
:root[data-theme="dark"] button:not(.secondary):not(.ghost):not(.danger), :root[data-theme="dark"] .btn:not(.secondary) { color: #0d2119; }
button:hover:not(:disabled), .btn:hover { background: var(--color-action-hover); }
button.secondary, .btn.secondary { background: transparent; color: var(--color-text-primary); border-color: var(--color-border-strong); }
button.secondary:hover, .btn.secondary:hover { background: var(--color-bg-secondary); }
button.ghost { color: var(--color-text-secondary); }
button.ghost:hover { color: var(--color-text-primary); background: var(--color-bg-secondary); }
button.danger { background: var(--color-error); color: #fff; }
button:disabled { color: var(--color-text-muted); background: var(--color-bg-secondary); border-color: var(--color-border-subtle); opacity: .72; }
button:focus-visible, .btn:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 3px; }
input.answer, .search-input, .objective-form select, .objective-form input[type="date"], input[type="file"] { border: 1px solid var(--color-border-strong); background: var(--color-surface-elevated); border-radius: var(--radius-control); }
input.answer:focus, .search-input:focus, select:focus { border-color: var(--color-focus); outline: 3px solid color-mix(in srgb, var(--color-focus) 24%, transparent); }
.progress-track { height: .45rem; background: var(--color-bg-secondary); }
.progress-fill { background: var(--color-action); transition: width var(--motion-standard) var(--ease-standard); }
.box, .feedback { border: 1px solid var(--color-border-subtle); border-left-width: 3px; }
.feedback.ok, .box.practice { border-left-color: var(--color-success); }
.feedback.ko, .box.mistake { border-left-color: var(--color-error); }
.feedback.info, .box.why { border-left-color: var(--color-info); }
.box.pitfall { border-left-color: var(--color-warning); }
.status-pill, .tag { border-radius: 999px; }
.choice { border-width: 1px; }
.choice:hover { border-color: var(--color-info); background: var(--color-info-soft); }
.study-card { background: var(--color-surface); border-color: var(--color-border-subtle); border-radius: var(--radius-surface); box-shadow: var(--shadow-surface); }
.formula, code { font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace; font-variant-ligatures: none; }
table.mini { width: 100%; }
table.mini td, table.mini th { border-color: var(--color-border-subtle); }
.today-context, .weak-list, .search-results, .criterion-list, .attempt-table { border-color: var(--color-border-subtle); }
.context-line, .weak-row, .search-results li, .criterion, .attempt-row { border-color: var(--color-border-subtle); }
.settings-section { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: var(--space-5); }
.settings-section h2 { margin-top: 0; }
.segmented-control { display: flex; padding: .2rem; margin: 0; border: 1px solid var(--color-border-subtle); border-radius: .65rem; background: var(--color-bg-secondary); }
.segmented-control legend { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.segmented-control label { cursor: pointer; }
.segmented-control input { position: absolute; opacity: 0; pointer-events: none; }
.segmented-control span { display: block; min-height: 40px; padding: .48rem .78rem; border-radius: .45rem; color: var(--color-text-secondary); }
.segmented-control input:checked + span { background: var(--color-surface); color: var(--color-text-primary); box-shadow: 0 1px 3px rgba(0,0,0,.12); }
.segmented-control input:focus-visible + span { outline: 3px solid var(--color-focus); outline-offset: 2px; }
@media (max-width: 768px) {
  #app { margin-top: var(--space-6); }
  .settings-section { grid-template-columns: 1fr; }
  .segmented-control { width: 100%; }
  .segmented-control label { flex: 1; text-align: center; }
}
@media (max-width: 680px) {
  #topbar { padding-inline: var(--space-4); }
  #topbar nav { background: var(--color-surface); border-color: var(--color-border-subtle); padding-bottom: var(--space-2); }
  #topbar nav a { min-height: 48px; border: 0; }
  #topbar nav a.active { box-shadow: inset 3px 0 var(--color-action); }
  .utility-nav { gap: var(--space-1); }
  .utility-nav a { padding-inline: .35rem; }
  .card { padding: var(--space-4); }
  .primary-action { padding: var(--space-5); }
}
@media (forced-colors: active) { button, .btn, .card, input, select { border: 1px solid ButtonText; } }

/* ---------- V5 : test de positionnement ---------- */
.placement-item {
  margin: 1.15rem 0 0;
  padding: .95rem 1rem 1rem;
  border: 1px solid var(--color-border-subtle, var(--locked));
  border-radius: .7rem;
  background: var(--color-bg-secondary, transparent);
}
.placement-item legend {
  float: left;              /* sort la question de l'encoche de bordure */
  width: 100%;
  padding: 0 0 .6rem;
  font-weight: 600;
  line-height: 1.45;
}
.placement-item::after { content: ''; display: block; clear: both; }
.placement-choice {
  display: flex;
  gap: .6rem;
  align-items: flex-start;
  min-height: 40px;
  padding: .4rem .3rem;
  cursor: pointer;
  line-height: 1.45;
}
.placement-choice input { margin-top: .3rem; flex: 0 0 auto; }
.placement-choice:hover span { text-decoration: underline; }
.flashcard-item .muted { margin-top: .35rem; line-height: 1.45; }