/* ===========================
   LX CARD SYSTEM (Cours/Exos/Fiche/Quiz)
=========================== */
:root{
  --lx-ink:#0f172a;
  --lx-muted:#64748b;
  --lx-line:rgba(15,23,42,.10);
  --lx-soft:#f7f9ff;
  --lx-surface:#ffffff;

  --lx-radius:18px;
  --lx-shadow:0 14px 40px rgba(15,23,42,.08);
  --lx-shadow-sm:0 10px 24px rgba(15,23,42,.06);

  /* Accent par défaut (exercices) */
  --lx-accent:#6091ba;
  --lx-accent-2:#53a8b6;

  --lx-chip-bg:rgba(96,145,186,.12);
  --lx-chip-text:#1e3a5f;

  --lx-btn-bg:rgba(15,23,42,.06);
  --lx-btn-text:var(--lx-ink);
}

[data-bs-theme="dark"]{
  --lx-ink:#eaf0ff;
  --lx-muted:rgba(234,240,255,.75);
  --lx-line:rgba(255,255,255,.14);
  --lx-soft:rgba(255,255,255,.06);
  --lx-surface:rgba(255,255,255,.04);

  --lx-shadow:0 16px 60px rgba(0,0,0,.35);
  --lx-shadow-sm:0 12px 30px rgba(0,0,0,.30);

  --lx-chip-bg:rgba(83,168,182,.18);
  --lx-chip-text:#d9fbff;

  --lx-btn-bg:rgba(255,255,255,.08);
  --lx-btn-text:var(--lx-ink);
}

/* Wrapper */
.lx-wrap{ max-width: 980px; margin: 0 auto; padding: 12px; }

/* Base card */
.lx-card{
  position: relative;
  background: var(--lx-surface);
  border: 1px solid var(--lx-line);
  border-radius: var(--lx-radius);
  box-shadow: var(--lx-shadow-sm);
  padding: 16px 16px 14px 16px;
  margin: 14px 0;
}

/* Header row */
.lx-card-hd{
  display:flex;
  gap: 12px;
  align-items:flex-start;
}

/* Number badge */
.lx-badge-num{
  width: 44px; height: 44px;
  display:flex; align-items:center; justify-content:center;
  border-radius: 14px;
  border: 1px solid rgba(96,145,186,.35);
  background: rgba(96,145,186,.12);
  color: var(--lx-ink);
  font-weight: 800;
  flex: 0 0 auto;
}

/* Title + tags */
.lx-card-title{
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--lx-ink);
  margin: 0;
  line-height: 1.25;
}
.lx-card-sub{
  margin-top: 8px;
  display:flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* Tag chips */
.lx-tag{
  display:inline-flex;
  align-items:center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(96,145,186,.25);
  background: var(--lx-chip-bg);
  color: var(--lx-chip-text);
  font-weight: 700;
  font-size: .85rem;
  user-select:none;
}

/* Body content panel */
.lx-panel{
  margin-top: 14px;
  border-radius: 16px;
  border: 1px dashed rgba(15,23,42,.14);
  background: linear-gradient(180deg, var(--lx-soft) 0%, rgba(255,255,255,.0) 100%);
  padding: 14px;
}

/* Footer (correction line + toggle) */
.lx-card-ft{
  display:flex;
  justify-content: space-between;
  align-items:center;
  margin-top: 14px;
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--lx-line);
}

.lx-ft-title{
  font-weight: 800;
  color: var(--lx-ink);
}

/* Details (native accordion, CSP-safe) */
.lx-details{
  margin-top: 12px;
  border-radius: 14px;
  border: 1px solid var(--lx-line);
  background: rgba(255,255,255,.0);
  overflow:hidden;
}

.lx-details summary{
  list-style: none;
  cursor: pointer;
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 12px;
  font-weight: 800;
  color: var(--lx-ink);
}
.lx-details summary::-webkit-details-marker{ display:none; }

.lx-toggle{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--lx-btn-bg);
  color: var(--lx-btn-text);
  border: 1px solid var(--lx-line);
  font-weight: 800;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.lx-solution{
  padding: 12px 14px 14px 14px;
  border-top: 1px solid var(--lx-line);
  color: var(--lx-ink);
}
.lx-solution p{ margin: 0 0 8px 0; color: var(--lx-muted); }

/* ===========================
   Variantes Cours/Exos/Fiche/Quiz
=========================== */
.lx-kind-cours{  --lx-accent:#22c55e; --lx-accent-2:#16a34a; --lx-chip-bg:rgba(34,197,94,.14);  --lx-chip-text:#14532d; }
.lx-kind-exos{   --lx-accent:#6091ba; --lx-accent-2:#53a8b6; --lx-chip-bg:rgba(96,145,186,.12); --lx-chip-text:#1e3a5f; }
.lx-kind-fiche{  --lx-accent:#f59e0b; --lx-accent-2:#f97316; --lx-chip-bg:rgba(245,158,11,.16); --lx-chip-text:#7c2d12; }
.lx-kind-quiz{   --lx-accent:#8b5cf6; --lx-accent-2:#ec4899; --lx-chip-bg:rgba(139,92,246,.15); --lx-chip-text:#312e81; }

.lx-kind-cours .lx-badge-num,
.lx-kind-exos  .lx-badge-num,
.lx-kind-fiche .lx-badge-num,
.lx-kind-quiz  .lx-badge-num{
  border-color: color-mix(in srgb, var(--lx-accent) 35%, transparent);
  background: color-mix(in srgb, var(--lx-accent) 14%, transparent);
}

/* Responsive: single column friendly */
@media (max-width: 520px){
  .lx-card{ padding: 14px; }
  .lx-badge-num{ width: 40px; height: 40px; border-radius: 13px; }
  .lx-card-title{ font-size: 1.02rem; }
  .lx-panel{ padding: 12px; }
}