/* École post-bac : identité fondée sur des lignes colorées par voie d'études. */
:root {
  color-scheme: light dark;
  --bg: #F4F6FA;
  --panneau: #FFFFFF;
  --encre: #15203A;
  --sourdine: #55627A;
  --filet: #DCE2EC;
  --lien: #1F4FD1;
  --marine: #1E2A52;
  --titre: 'Bricolage Grotesque', 'Avenir Next', 'Trebuchet MS', system-ui, sans-serif;
  --texte: 'Atkinson Hyperlegible', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --mesure: 40rem;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0F1728;
    --panneau: #162036;
    --encre: #E7ECF6;
    --sourdine: #A3B0C7;
    --filet: #2A3652;
    --lien: #8FB1FF;
    --marine: #9DB2FF;
  }
}
.vc { --voie: var(--v-c, var(--marine)); }
@media (prefers-color-scheme: dark) {
  .vc { --voie: var(--v-s, var(--v-c, var(--marine))); }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--encre);
  font: 400 1.0625rem/1.65 var(--texte);
  overflow-wrap: break-word;
}
img, svg { max-width: 100%; }
a { color: var(--lien); text-underline-offset: 0.18em; text-decoration-thickness: 0.08em; }
a:hover { text-decoration-thickness: 0.16em; }
:focus-visible { outline: 3px solid var(--lien); outline-offset: 2px; border-radius: 2px; }

.evitement {
  position: absolute; left: 1rem; top: -4rem; z-index: 10;
  background: var(--panneau); color: var(--encre);
  padding: 0.6rem 1rem; border: 2px solid var(--lien); border-radius: 0.4rem;
}
.evitement:focus { top: 1rem; }

.enveloppe { max-width: 72rem; margin: 0 auto; padding: 0 1rem; }

/* ---------- En-tête ---------- */
.entete { background: var(--panneau); border-bottom: 1px solid var(--filet); }
.entete .enveloppe { display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem 1.25rem; padding-top: 0.7rem; padding-bottom: 0.7rem; }
.marque {
  display: flex; align-items: center; gap: 0.55rem;
  font: 800 1.2rem/1 var(--titre); letter-spacing: -0.01em;
  color: var(--encre); text-decoration: none; white-space: nowrap;
}
.marque svg { width: 1.7rem; height: 1.7rem; flex: none; }
.entete nav { flex: 1 1 100%; min-width: 0; }
.entete nav ul { list-style: none; margin: 0; padding: 0 0 0.15rem; display: flex; gap: 0.15rem; overflow-x: auto; scrollbar-width: thin; }
.entete nav a {
  display: flex; align-items: center; gap: 0.45rem;
  padding: 0.4rem 0.65rem; border-radius: 999px;
  color: var(--encre); text-decoration: none; font-size: 0.95rem; white-space: nowrap;
}
.entete nav a:hover { background: color-mix(in srgb, var(--voie) 14%, transparent); }
.entete nav a[aria-current] { font-weight: 700; box-shadow: inset 0 -3px 0 var(--voie); border-radius: 0.3rem 0.3rem 0 0; }
.pastille { width: 0.62rem; height: 0.62rem; border-radius: 50%; background: var(--voie); flex: none; }
@media (min-width: 62rem) {
  .entete nav { flex: 1 1 0; }
  .entete nav ul { justify-content: flex-end; }
}

/* ---------- Pages ---------- */
.page { max-width: 72rem; margin: 0 auto; padding: 1.75rem 1rem 4.5rem; }
@media (min-width: 48rem) {
  .enveloppe, .page { padding-left: 1.5rem; padding-right: 1.5rem; }
}
.bandeau { border-left: 0.45rem solid var(--voie); padding: 0.15rem 0 0.15rem 1.1rem; margin: 0 0 2.2rem; max-width: 48rem; }
.fil ol { list-style: none; margin: 0 0 0.8rem; padding: 0; display: flex; flex-wrap: wrap; gap: 0.1rem 0.4rem; font-size: 0.9rem; color: var(--sourdine); }
.fil li + li::before { content: "/"; margin-right: 0.4rem; opacity: 0.6; }
.fil a { color: var(--sourdine); }
h1 { font: 800 clamp(1.95rem, 4.2vw, 2.9rem)/1.08 var(--titre); letter-spacing: -0.02em; margin: 0 0 0.8rem; text-wrap: balance; }
.chapo { font-size: 1.2rem; line-height: 1.5; margin: 0 0 0.8rem; max-width: 40rem; }
.maj { font-size: 0.9rem; color: var(--sourdine); margin: 0; }

.grille { display: grid; gap: 1.5rem; }
@media (min-width: 62rem) {
  .grille { grid-template-columns: minmax(0, var(--mesure)) 15rem; gap: 4rem; justify-content: start; }
}

.prose { max-width: var(--mesure); min-width: 0; }
.prose > *:first-child { margin-top: 0; }
.prose h2 { font: 700 1.6rem/1.2 var(--titre); letter-spacing: -0.01em; margin: 2.6rem 0 0.8rem; scroll-margin-top: 1rem; text-wrap: balance; }
.prose h3 { font: 700 1.2rem/1.3 var(--titre); margin: 1.8rem 0 0.5rem; scroll-margin-top: 1rem; }
.prose p, .prose ul, .prose ol { margin: 0 0 1.1rem; }
.prose ul, .prose ol { padding-left: 1.3rem; }
.prose li { margin: 0.3rem 0; }
.prose li::marker { color: var(--voie); }
.prose hr { border: 0; border-top: 1px solid var(--filet); margin: 2rem 0; }
code { font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace; font-size: 0.92em; background: color-mix(in srgb, var(--voie) 10%, transparent); padding: 0.08em 0.35em; border-radius: 0.25rem; }

.callout {
  margin: 1.5rem 0; padding: 0.9rem 1.1rem;
  background: color-mix(in srgb, var(--voie) 9%, var(--panneau));
  border-left: 0.3rem solid var(--voie); border-radius: 0 0.5rem 0.5rem 0;
}
.callout > :last-child { margin-bottom: 0; }
.callout-attention { border-left-style: double; border-left-width: 0.45rem; }

.table-wrap { overflow-x: auto; margin: 1.4rem 0; border: 1px solid var(--filet); border-radius: 0.5rem; background: var(--panneau); }
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; line-height: 1.45; }
th, td { padding: 0.65rem 0.85rem; text-align: left; vertical-align: top; border-bottom: 1px solid var(--filet); }
tbody tr:last-child > * { border-bottom: 0; }
thead th { background: color-mix(in srgb, var(--voie) 11%, var(--panneau)); font-weight: 700; white-space: nowrap; }
tbody th { font-weight: 700; }
.table-wrap:focus-visible { outline-offset: 3px; }
@media (max-width: 40rem) { table { min-width: 34rem; } }

.sources { margin-top: 3rem; padding-top: 1.1rem; border-top: 2px solid var(--voie); font-size: 0.93rem; color: var(--sourdine); }
.sources h2 { font-size: 1.15rem; margin: 0 0 0.6rem; }
.sources ul { margin-bottom: 0; }
.sources li { margin: 0.35rem 0; }

/* Sommaire */
.sommaire-mobile { margin: 0 0 1.6rem; padding: 0.6rem 0.9rem; background: var(--panneau); border: 1px solid var(--filet); border-radius: 0.5rem; font-size: 0.95rem; }
.sommaire-mobile summary { cursor: pointer; font-weight: 700; }
.sommaire-mobile ol { margin: 0.6rem 0 0.2rem; padding-left: 1.2rem; }
.sommaire-bureau { display: none; }
@media (min-width: 62rem) {
  .sommaire-mobile { display: none; }
  .sommaire-bureau { display: block; position: sticky; top: 1.25rem; align-self: start; font-size: 0.92rem; }
  .sommaire-titre { font: 700 0.95rem var(--titre); margin: 0 0 0.6rem; }
  .sommaire-bureau ol { list-style: none; margin: 0; padding: 0 0 0 0.9rem; border-left: 3px solid var(--voie); }
  .sommaire-bureau li { margin: 0.45rem 0; line-height: 1.35; }
  .sommaire-bureau a { color: var(--sourdine); text-decoration: none; }
  .sommaire-bureau a:hover { color: var(--encre); text-decoration: underline; }
}

/* Liste des guides d'une rubrique */
.guides { list-style: none; margin: 1rem 0 0; padding: 0 !important; }
.guides li { margin: 0; padding: 0.95rem 0 0.95rem 1rem; border-left: 4px solid var(--voie); border-bottom: 1px solid var(--filet); }
.guides li:last-child { border-bottom: 0; }
.guides a { font: 700 1.12rem/1.3 var(--titre); }
.guides p { margin: 0.2rem 0 0; color: var(--sourdine); font-size: 0.97rem; }

/* Pages voisines */
.voisins { margin-top: 3rem; padding: 1rem 1.2rem; background: var(--panneau); border: 1px solid var(--filet); border-top: 4px solid var(--voie); border-radius: 0.4rem; }
.voisins h2 { font: 700 1.05rem var(--titre); margin: 0 0 0.6rem; }
.voisins ul { list-style: none; margin: 0; padding: 0 !important; display: flex; flex-wrap: wrap; gap: 0.3rem 1.2rem; }
.voisins li { margin: 0; }

/* ---------- Accueil ---------- */
.hero { max-width: 48rem; padding-top: 0.5rem; }
.hero h1 { font-size: clamp(2.3rem, 6vw, 4rem); line-height: 1.03; margin-bottom: 1rem; }
.hero .chapo { font-size: 1.3rem; max-width: 36rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.7rem; margin: 1.5rem 0 0; }
.bouton {
  display: inline-block; padding: 0.7rem 1.15rem; border-radius: 0.5rem;
  background: var(--marine); color: var(--bg); font-weight: 700; text-decoration: none;
}
.bouton:hover { filter: brightness(1.12); }
.bouton-clair { background: transparent; color: var(--encre); box-shadow: inset 0 0 0 2px var(--encre); }

.frise { margin: 2.6rem 0 0; padding: 1.3rem 1.2rem 1.1rem; background: var(--panneau); border: 1px solid var(--filet); border-radius: 0.75rem; }
.frise figcaption { font: 700 1.1rem var(--titre); }
.frise-axe { position: relative; height: 1.2rem; margin: 1rem 0 0.2rem; font-size: 0.72rem; color: var(--sourdine); }
.frise-axe span { position: absolute; left: var(--p); white-space: nowrap; }
@media (max-width: 40rem) { .frise-axe span:nth-child(even) { display: none; } }
.frise-axe span:last-child { transform: translateX(-100%); }
.frise-pistes { list-style: none; margin: 0; padding: 0; display: grid; gap: 1.15rem; }
.frise-ligne { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.1rem 0.7rem; margin: 0; }
.frise-nom { font-weight: 700; }
.frise-dates { color: var(--sourdine); font-size: 0.93rem; }
.frise-piste { display: block; position: relative; height: 0.85rem; margin: 0.35rem 0 0.3rem; background: linear-gradient(var(--filet), var(--filet)) center / 100% 2px no-repeat; }
.frise-barre { position: absolute; left: var(--a); width: var(--l); top: 0; bottom: 0; min-width: 0.85rem; border-radius: 999px; background: var(--marine); }
.frise-prolong { position: absolute; left: calc(var(--a) + var(--l)); width: var(--p); top: 0.2rem; bottom: 0.2rem; background: repeating-linear-gradient(-45deg, var(--marine) 0 3px, transparent 3px 7px); border-radius: 0 999px 999px 0; opacity: 0.7; }
.ton3 .frise-barre { background: color-mix(in srgb, var(--marine) 70%, var(--lien)); }
.ton4 .frise-barre { background: color-mix(in srgb, var(--marine) 45%, var(--panneau)); box-shadow: inset 0 0 0 2px var(--marine); }
.frise-detail { margin: 0; font-size: 0.93rem; color: var(--sourdine); max-width: 44rem; }
.frise-lien { margin: 1.2rem 0 0; font-weight: 700; }

.plan, .essentiels { margin-top: 3.4rem; }
.plan h2, .essentiels h2, .accueil-texte h2 { font: 700 1.7rem/1.2 var(--titre); letter-spacing: -0.01em; margin: 0 0 1.1rem; }
.plan-liste { list-style: none; margin: 0; padding: 0; }
.plan-liste > li { display: grid; gap: 0.6rem 2rem; padding: 1.15rem 0 1.15rem 1.1rem; border-left: 0.45rem solid var(--voie); border-bottom: 1px solid var(--filet); }
.plan-liste > li:last-child { border-bottom: 0; }
.plan-tete h3 { margin: 0 0 0.25rem; font: 700 1.3rem/1.25 var(--titre); }
.plan-tete h3 a { color: var(--encre); }
.plan-tete p { margin: 0; color: var(--sourdine); font-size: 0.98rem; max-width: 34rem; }
.plan-pages { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.25rem 1rem; align-content: start; font-size: 0.97rem; }
@media (min-width: 52rem) {
  .plan-liste > li { grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); }
}
.essentiels ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.2rem 2rem; }
@media (min-width: 44rem) { .essentiels ul { grid-template-columns: 1fr 1fr; } }
.essentiels li { padding: 0.55rem 0 0.55rem 0.9rem; border-left: 4px solid var(--voie); }
.essentiels a { font-weight: 700; }
.accueil-texte { margin-top: 3.4rem; }

/* ---------- Pied de page ---------- */
.pied { background: var(--panneau); border-top: 1px solid var(--filet); font-size: 0.95rem; color: var(--sourdine); }
.pied-grille { display: grid; gap: 1.6rem 3rem; padding-top: 2rem; padding-bottom: 2.4rem; }
@media (min-width: 48rem) { .pied-grille { grid-template-columns: 1.4fr 1fr 1fr; } }
.pied p { margin: 0 0 0.5rem; }
.pied-nom { font: 800 1.15rem var(--titre); color: var(--encre); }
.pied-titre { font-weight: 700; color: var(--encre); }
.pied ul { list-style: none; margin: 0; padding: 0; }
.pied li { margin: 0.25rem 0; }
.pied-maj { font-size: 0.88rem; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}
@media print {
  .entete nav, .sommaire-bureau, .sommaire-mobile, .evitement, .voisins { display: none; }
  body { background: #fff; color: #000; }
}