:root {
  --bg: #0a0a0f;
  --surface: #12121a;
  --surface2: #1a1a26;
  --border: #ffffff12;
  --border2: #ffffff22;
  --text: #f0f0f8;
  --muted: #8888aa;
  --accent: #7c6af7;
  --accent2: #a594fa;
  --green: #22d3a0;
  --red: #f45b69;
  --amber: #f5a623;
  --blue: #4facfe;
  --debutant: #22d3a0;
  --intermediaire: #f5a623;
  --avance: #f45b69;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'DM Sans', sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; overflow-x: hidden; }
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image: linear-gradient(rgba(124,106,247,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(124,106,247,0.03) 1px, transparent 1px);
  background-size: 40px 40px; pointer-events: none; z-index: 0;
}
.shell { position: relative; z-index: 1; display: flex; min-height: 100vh; }
.sidebar { width: 280px; flex-shrink: 0; background: var(--surface); border-right: 1px solid var(--border); display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh; overflow-y: auto; }
.sidebar-logo { padding: 28px 24px 20px; border-bottom: 1px solid var(--border); }
.sidebar-logo .app-name { font-family: 'Syne', sans-serif; font-size: 15px; font-weight: 700; color: var(--text); letter-spacing: 0.02em; }
.sidebar-logo .app-sub { font-size: 11px; color: var(--muted); margin-top: 2px; font-family: 'DM Mono', monospace; }
.progress-overview { padding: 16px 24px; border-bottom: 1px solid var(--border); }
.progress-overview .label { font-size: 10px; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); margin-bottom: 8px; }
.prog-bar-bg { height: 3px; background: var(--border2); border-radius: 99px; overflow: hidden; }
.prog-bar-fill { height: 3px; background: linear-gradient(90deg, var(--accent), var(--blue)); border-radius: 99px; transition: width 0.5s ease; }
.prog-text { font-size: 11px; color: var(--muted); margin-top: 6px; font-family: 'DM Mono', monospace; }
.nav-section { padding: 12px 0; border-bottom: 1px solid var(--border); }
.nav-section-label { font-size: 9px; text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); padding: 4px 24px 8px; }
.nav-item { display: flex; align-items: center; gap: 10px; padding: 9px 24px; cursor: pointer; transition: all 0.15s; border-left: 2px solid transparent; font-size: 13px; color: var(--muted); }
.nav-item:hover { background: rgba(124,106,247,0.06); color: var(--text); }
.nav-item.active { background: rgba(124,106,247,0.1); border-left-color: var(--accent); color: var(--text); }
.nav-item.completed { color: var(--green); }
.nav-item.completed .nav-check { opacity: 1; }
.nav-dot { width: 6px; height: 6px; border-radius: 50%; border: 1.5px solid currentColor; flex-shrink: 0; transition: all 0.15s; }
.nav-item.active .nav-dot { background: var(--accent); border-color: var(--accent); }
.nav-item.completed .nav-dot { background: var(--green); border-color: var(--green); }
.nav-check { margin-left: auto; font-size: 11px; opacity: 0; color: var(--green); }
.main { flex: 1; padding: 40px 48px; max-width: 860px; }
.screen { display: none; animation: fadeIn 0.3s ease; }
.screen.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.home-eyebrow { font-family: 'DM Mono', monospace; font-size: 11px; color: var(--accent2); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 12px; }
.home-title { font-family: 'Syne', sans-serif; font-size: 42px; font-weight: 800; line-height: 1.1; margin-bottom: 16px; background: linear-gradient(135deg, #f0f0f8 0%, var(--accent2) 60%, var(--blue) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.home-desc { font-size: 16px; color: var(--muted); line-height: 1.7; max-width: 560px; margin-bottom: 40px; }
.level-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 40px; }
.level-card { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; padding: 24px; cursor: pointer; transition: all 0.2s; position: relative; overflow: hidden; }
.level-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; }
.level-card.debutant::before { background: var(--debutant); }
.level-card.inter::before { background: var(--intermediaire); }
.level-card.avance::before { background: var(--avance); }
.level-card:hover { border-color: var(--border2); transform: translateY(-2px); box-shadow: 0 8px 32px rgba(0,0,0,0.3); }
.level-card .lc-icon { font-size: 28px; margin-bottom: 12px; }
.level-card .lc-name { font-family: 'Syne', sans-serif; font-size: 16px; font-weight: 700; margin-bottom: 4px; }
.level-card.debutant .lc-name { color: var(--debutant); }
.level-card.inter .lc-name { color: var(--intermediaire); }
.level-card.avance .lc-name { color: var(--avance); }
.level-card .lc-desc { font-size: 12px; color: var(--muted); line-height: 1.5; margin-bottom: 16px; }
.level-card .lc-modules { font-family: 'DM Mono', monospace; font-size: 10px; color: var(--muted); }
.start-btn { width: 100%; padding: 10px; border-radius: 8px; border: 1px solid var(--border2); background: transparent; color: var(--text); font-size: 12px; font-family: 'DM Sans', sans-serif; cursor: pointer; transition: all 0.15s; margin-top: 12px; }
.level-card.debutant .start-btn:hover { background: rgba(34,211,160,0.1); border-color: var(--debutant); color: var(--debutant); }
.level-card.inter .start-btn:hover { background: rgba(245,166,35,0.1); border-color: var(--intermediaire); color: var(--intermediaire); }
.level-card.avance .start-btn:hover { background: rgba(244,91,105,0.1); border-color: var(--avance); color: var(--avance); }
.module-header { margin-bottom: 32px; }
.module-breadcrumb { font-family: 'DM Mono', monospace; font-size: 11px; color: var(--muted); margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.module-breadcrumb .sep { color: var(--border2); }
.module-title { font-family: 'Syne', sans-serif; font-size: 28px; font-weight: 700; margin-bottom: 8px; }
.module-meta { display: flex; gap: 16px; align-items: center; }
.meta-pill { font-family: 'DM Mono', monospace; font-size: 10px; padding: 3px 10px; border-radius: 99px; border: 1px solid var(--border2); color: var(--muted); }
.lesson-section { background: var(--surface); border: 1px solid var(--border); border-radius: 16px; margin-bottom: 20px; overflow: hidden; }
.lesson-section-header { display: flex; align-items: center; gap: 12px; padding: 18px 24px; cursor: pointer; user-select: none; transition: background 0.15s; }
.lesson-section-header:hover { background: rgba(255,255,255,0.02); }
.section-icon { width: 32px; height: 32px; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 15px; flex-shrink: 0; }
.icon-theory { background: rgba(124,106,247,0.15); }
.icon-prompt { background: rgba(79,172,254,0.15); }
.icon-exercise { background: rgba(245,166,35,0.15); }
.icon-corrected { background: rgba(34,211,160,0.15); }
.section-title { font-size: 14px; font-weight: 500; flex: 1; }
.section-toggle { font-size: 11px; color: var(--muted); transition: transform 0.2s; }
.lesson-section.open .section-toggle { transform: rotate(180deg); }
.section-body { display: none; padding: 0 24px 24px; border-top: 1px solid var(--border); }
.lesson-section.open .section-body { display: block; }
.theory-content { padding-top: 18px; font-size: 14px; color: var(--muted); line-height: 1.8; }
.theory-content p { margin-bottom: 12px; }
.theory-content strong { color: var(--text); font-weight: 500; }
.info-box { background: rgba(124,106,247,0.08); border: 1px solid rgba(124,106,247,0.2); border-radius: 10px; padding: 14px 16px; margin: 16px 0; font-size: 13px; color: var(--text); line-height: 1.6; }
.info-box .info-label { font-family: 'DM Mono', monospace; font-size: 10px; text-transform: uppercase; color: var(--accent2); letter-spacing: 0.08em; margin-bottom: 6px; }
.warn-box { background: rgba(244,91,105,0.08); border: 1px solid rgba(244,91,105,0.2); border-radius: 10px; padding: 14px 16px; margin: 16px 0; font-size: 13px; color: var(--text); line-height: 1.6; }
.warn-box .warn-label { font-family: 'DM Mono', monospace; font-size: 10px; text-transform: uppercase; color: var(--red); letter-spacing: 0.08em; margin-bottom: 6px; }
.green-box { background: rgba(34,211,160,0.08); border: 1px solid rgba(34,211,160,0.2); border-radius: 10px; padding: 14px 16px; margin: 16px 0; font-size: 13px; color: var(--text); line-height: 1.6; }
.green-box .green-label { font-family: 'DM Mono', monospace; font-size: 10px; text-transform: uppercase; color: var(--green); letter-spacing: 0.08em; margin-bottom: 6px; }
.compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 16px 0; }
.compare-col { background: var(--surface2); border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; }
.compare-col .col-label { font-family: 'DM Mono', monospace; font-size: 10px; text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 10px; }
.compare-col.bad .col-label { color: var(--red); }
.compare-col.good .col-label { color: var(--green); }
.compare-col ul { list-style: none; display: flex; flex-direction: column; gap: 6px; }
.compare-col ul li { font-size: 12px; color: var(--muted); padding-left: 14px; position: relative; line-height: 1.5; }
.compare-col.bad ul li::before { content: '✗'; position: absolute; left: 0; color: var(--red); font-size: 10px; }
.compare-col.good ul li::before { content: '✓'; position: absolute; left: 0; color: var(--green); font-size: 10px; }
.skill-tag { display: inline-block; background: rgba(79,172,254,0.12); border: 1px solid rgba(79,172,254,0.25); border-radius: 6px; padding: 3px 10px; font-family: 'DM Mono', monospace; font-size: 12px; color: var(--blue); margin: 2px; }
.prompt-list { padding-top: 18px; display: flex; flex-direction: column; gap: 10px; }
.prompt-card { background: var(--surface2); border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; display: flex; gap: 12px; align-items: flex-start; cursor: pointer; transition: all 0.15s; }
.prompt-card:hover { border-color: rgba(79,172,254,0.3); background: rgba(79,172,254,0.04); }
.prompt-card .prompt-icon { font-size: 14px; flex-shrink: 0; margin-top: 1px; }
.prompt-card .prompt-text { font-family: 'DM Mono', monospace; font-size: 12px; color: var(--blue); line-height: 1.6; flex: 1; }
.prompt-card .copy-hint { font-size: 10px; color: var(--muted); flex-shrink: 0; opacity: 0; transition: opacity 0.15s; }
.prompt-card:hover .copy-hint { opacity: 1; }
.prompt-card.copied { border-color: rgba(34,211,160,0.4); }
.prompt-card.copied .prompt-text { color: var(--green); }
.exercise-wrapper { padding-top: 18px; }
.exercise-scenario { background: var(--surface2); border-radius: 10px; padding: 18px; margin-bottom: 16px; font-size: 13px; line-height: 1.7; color: var(--muted); border-left: 3px solid var(--amber); }
.exercise-scenario strong { color: var(--text); }
.exercise-scenario .scenario-label { font-family: 'DM Mono', monospace; font-size: 10px; text-transform: uppercase; color: var(--amber); letter-spacing: 0.08em; margin-bottom: 8px; }
.exercise-question { font-size: 14px; font-weight: 500; margin-bottom: 14px; color: var(--text); }
.choices { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.choice { display: flex; align-items: flex-start; gap: 12px; padding: 12px 16px; border: 1px solid var(--border); border-radius: 10px; cursor: pointer; transition: all 0.15s; font-size: 13px; color: var(--muted); background: var(--surface2); }
.choice:hover { border-color: var(--border2); color: var(--text); }
.choice.selected-correct { border-color: var(--green); background: rgba(34,211,160,0.08); color: var(--green); }
.choice.selected-wrong { border-color: var(--red); background: rgba(244,91,105,0.08); color: var(--red); }
.choice.reveal-correct { border-color: rgba(34,211,160,0.4); color: var(--green); background: rgba(34,211,160,0.04); }
.choice .choice-letter { width: 22px; height: 22px; border-radius: 6px; border: 1px solid currentColor; display: flex; align-items: center; justify-content: center; font-family: 'DM Mono', monospace; font-size: 10px; flex-shrink: 0; }
.feedback-box { padding: 14px 16px; border-radius: 10px; font-size: 13px; line-height: 1.6; margin-bottom: 16px; display: none; }
.feedback-box.correct { background: rgba(34,211,160,0.08); border: 1px solid rgba(34,211,160,0.25); color: var(--green); }
.feedback-box.wrong { background: rgba(244,91,105,0.08); border: 1px solid rgba(244,91,105,0.25); color: #f8a0a8; }
.feedback-box.show { display: block; }
.exercise-actions { display: flex; gap: 10px; }
.btn { padding: 9px 20px; border-radius: 8px; font-size: 13px; cursor: pointer; font-family: 'DM Sans', sans-serif; transition: all 0.15s; border: 1px solid var(--border2); background: transparent; color: var(--muted); }
.btn:hover { color: var(--text); border-color: var(--border2); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent2); border-color: var(--accent2); color: white; }
.btn:disabled { opacity: 0.35; cursor: default; }
.corrected-wrapper { padding-top: 18px; }
.corrected-step { display: flex; gap: 14px; margin-bottom: 20px; }
.corrected-num { width: 26px; height: 26px; border-radius: 8px; background: rgba(124,106,247,0.15); color: var(--accent2); font-family: 'DM Mono', monospace; font-size: 11px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 2px; }
.corrected-content { flex: 1; }
.corrected-content .step-title { font-size: 13px; font-weight: 500; color: var(--text); margin-bottom: 4px; }
.corrected-content .step-desc { font-size: 13px; color: var(--muted); line-height: 1.6; }
.corrected-prompt { background: var(--surface2); border-radius: 8px; padding: 10px 14px; margin-top: 8px; font-family: 'DM Mono', monospace; font-size: 12px; color: var(--blue); line-height: 1.6; border-left: 2px solid rgba(79,172,254,0.4); }
.result-preview { background: var(--surface2); border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; margin-top: 8px; font-size: 12px; color: var(--green); font-family: 'DM Mono', monospace; line-height: 1.6; }
.result-preview::before { content: '✓ Résultat attendu'; display: block; font-size: 10px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin-bottom: 6px; }
.module-nav { display: flex; justify-content: space-between; align-items: center; margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--border); }
.module-complete-btn { padding: 11px 28px; background: linear-gradient(135deg, var(--accent), var(--blue)); border: none; border-radius: 10px; color: white; font-size: 14px; font-weight: 500; cursor: pointer; font-family: 'DM Sans', sans-serif; transition: all 0.2s; box-shadow: 0 4px 20px rgba(124,106,247,0.3); }
.module-complete-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 28px rgba(124,106,247,0.45); }
.completion-screen { text-align: center; padding: 60px 0; }
.res-link-card { display: flex; align-items: center; gap: 20px; background: rgba(124,106,247,0.08); border: 1px solid rgba(124,106,247,0.25); border-radius: 14px; padding: 20px 24px; margin-bottom: 28px; text-decoration: none; transition: border-color 0.15s, box-shadow 0.15s; }
.res-link-card:hover { border-color: rgba(124,106,247,0.5); box-shadow: 0 6px 24px rgba(124,106,247,0.12); }
.res-link-icon { font-size: 28px; flex-shrink: 0; }
.res-link-body { flex: 1; }
.res-link-label { font-family: 'DM Mono', monospace; font-size: 10px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent2); margin-bottom: 4px; }
.res-link-title { font-family: 'Syne', sans-serif; font-size: 16px; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.res-link-desc { font-size: 12px; color: var(--muted); line-height: 1.5; }
.res-link-arrow { font-family: 'DM Mono', monospace; font-size: 13px; color: var(--accent2); flex-shrink: 0; }
.res-section-title { font-family: 'Syne', sans-serif; font-size: 16px; font-weight: 700; color: var(--text); margin: 28px 0 14px; }
.res-concept { display: flex; gap: 14px; margin-bottom: 16px; align-items: flex-start; }
.res-concept-num { width: 28px; height: 28px; border-radius: 8px; background: rgba(124,106,247,0.12); color: var(--accent2); font-family: 'DM Mono', monospace; font-size: 11px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 1px; }
.res-concept-body { flex: 1; }
.res-concept-title { font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 3px; }
.res-concept-text { font-size: 13px; color: var(--muted); line-height: 1.6; }
.res-concept-text code { font-family: 'DM Mono', monospace; font-size: 11px; background: rgba(255,255,255,0.06); padding: 1px 5px; border-radius: 4px; color: var(--accent2); }
.res-checklist { list-style: none; display: flex; flex-direction: column; gap: 8px; margin: 0; padding: 0; }
.res-checklist li { display: flex; align-items: flex-start; gap: 10px; font-size: 13px; color: var(--muted); line-height: 1.5; }
.res-checklist li::before { content: '☐'; font-family: 'DM Mono', monospace; font-size: 13px; color: var(--accent2); flex-shrink: 0; }
.completion-icon { font-size: 64px; margin-bottom: 24px; }
.completion-title { font-family: 'Syne', sans-serif; font-size: 32px; font-weight: 800; margin-bottom: 12px; background: linear-gradient(135deg, var(--green), var(--blue)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.completion-desc { font-size: 15px; color: var(--muted); line-height: 1.7; max-width: 480px; margin: 0 auto 32px; }
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 99px; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(10,10,15,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  height: 48px;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.topbar-back {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--muted);
  text-decoration: none;
  font-family: 'DM Mono', monospace;
  font-size: 0.78rem;
  transition: color 0.15s;
}
.topbar-back:hover { color: var(--accent2); }
.topbar-sep { color: var(--border2); font-size: 1.1rem; }
.topbar-title { font-family: 'Syne', sans-serif; font-size: 0.85rem; font-weight: 700; color: var(--text); }
.sidebar-breadcrumb {
  display: flex;
  align-items: center;
  gap: 5px;
  font-family: 'DM Mono', monospace;
  font-size: 10px;
  color: var(--muted);
  margin-bottom: 10px;
  flex-wrap: wrap;
}
.sidebar-breadcrumb a { color: var(--muted); text-decoration: none; transition: color 0.2s; }
.sidebar-breadcrumb a:hover { color: var(--accent2); }
.sidebar-breadcrumb .sep { opacity: 0.4; }
.sidebar-breadcrumb .crumb-current { color: var(--accent2); }
.lang-toggle {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-family: 'DM Mono', monospace;
  font-size: 0.72rem;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--border2);
  padding: 0.25rem 0.65rem;
  border-radius: 6px;
  transition: color 0.15s, border-color 0.15s;
}
.lang-toggle:hover { color: var(--accent2); border-color: var(--accent2); }