:root {
  --fond: #f3f7f4;
  --surface: #ffffff;
  --surface-soft: #eef6f1;

  --texte: #17251f;
  --texte-doux: #52645c;

  --bleu: #0f766e;
  --bleu-fonce: #134e4a;
  --bleu-pale: #ccfbf1;

  --vert: #166534;
  --vert-pale: #dcfce7;

  --jaune: #a16207;
  --jaune-pale: #fef9c3;

  --rouge: #b91c1c;
  --rouge-pale: #fee2e2;

  --violet: #4c1d95;
  --violet-pale: #ede9fe;

  --bordure: #d8e4dc;
  --ombre: 0 24px 70px rgba(15, 23, 42, 0.10);
  --ombre-douce: 0 14px 35px rgba(15, 23, 42, 0.07);
  --rayon: 28px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Source Sans 3", "Segoe UI", Arial, sans-serif;
  color: var(--texte);
  background:
    radial-gradient(circle at top left, rgba(15,118,110,.14), transparent 34rem),
    radial-gradient(circle at top right, rgba(22,101,52,.12), transparent 30rem),
    linear-gradient(180deg, #f8fbf9 0%, var(--fond) 55%, #f7faf8 100%);
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

:focus-visible {
  outline: 3px solid var(--bleu);
  outline-offset: 4px;
}

.conteneur {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.barre-haut {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.88);
  border-bottom: 1px solid rgba(216,228,220,.9);
  backdrop-filter: blur(18px);
}

.navigation {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 900;
  color: var(--bleu-fonce);
  letter-spacing: -0.04em;
  font-size: 1.1rem;
}

.logo-symbole {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 17px;
  color: white;
  background: linear-gradient(135deg, var(--bleu), var(--vert));
  box-shadow: 0 12px 28px rgba(15,118,110,.25);
}

nav {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

nav a {
  color: var(--texte-doux);
  padding: 9px 13px;
  border-radius: 999px;
  font-weight: 800;
  font-size: .96rem;
  transition: .2s ease;
}

nav a:hover,
nav a.actif {
  color: var(--bleu-fonce);
  background: var(--bleu-pale);
}

.bouton {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 11px 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 900;
  transition: .18s ease;
  cursor: pointer;
}

.bouton:hover {
  transform: translateY(-2px);
}

.bouton-principal {
  color: white;
  background: var(--bleu);
  box-shadow: 0 16px 32px rgba(15,118,110,.22);
}

.bouton-principal:hover {
  background: var(--bleu-fonce);
}

.bouton-secondaire {
  color: var(--bleu-fonce);
  background: rgba(255,255,255,.92);
  border-color: var(--bordure);
}

.bouton-secondaire:hover {
  background: var(--bleu-pale);
}

.bouton-inactif,
.bouton[aria-disabled="true"] {
  color: var(--texte-doux);
  background: var(--surface-soft);
  border-color: var(--bordure);
  pointer-events: none;
  opacity: .85;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  font-size: .9rem;
  font-weight: 900;
  width: fit-content;
}

.badge-bleu { color: var(--bleu-fonce); background: var(--bleu-pale); }
.badge-vert { color: var(--vert); background: var(--vert-pale); }
.badge-jaune { color: var(--jaune); background: var(--jaune-pale); }
.badge-violet { color: var(--violet); background: var(--violet-pale); }
.badge-rouge { color: var(--rouge); background: var(--rouge-pale); }

.hero {
  padding: 58px 0 42px;
}

.carte-hero {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: 1.12fr .88fr;
  gap: 36px;
  align-items: center;
  padding: 42px;
  border-radius: 38px;
  background:
    linear-gradient(135deg, rgba(204,251,241,.94), rgba(220,252,231,.82)),
    white;
  border: 1px solid rgba(216,228,220,.95);
  box-shadow: var(--ombre);
}

.carte-hero::after {
  content: "";
  position: absolute;
  width: 360px;
  height: 360px;
  right: -150px;
  top: -150px;
  border-radius: 50%;
  background: rgba(255,255,255,.45);
  pointer-events: none;
}

.carte-hero > * {
  position: relative;
  z-index: 1;
}

.fil-ariane {
  color: var(--texte-doux);
  font-weight: 800;
  margin: 0 0 16px;
}

h1, h2, h3 {
  margin: 0;
  line-height: 1.1;
  letter-spacing: -0.045em;
  color: var(--bleu-fonce);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 5.2rem);
  max-width: 820px;
  margin-top: 16px;
}

.description,
.hero-description {
  color: var(--texte-doux);
  font-size: clamp(1.05rem, 1.6vw, 1.24rem);
  max-width: 760px;
  margin: 22px 0 28px;
}

.ligne-boutons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.fiche-info {
  background: rgba(255,255,255,.88);
  border: 1px solid rgba(216,228,220,.95);
  border-radius: 28px;
  padding: 24px;
  box-shadow: var(--ombre-douce);
}

.fiche-info h2 {
  font-size: 1.55rem;
  margin-bottom: 16px;
}

.infos {
  display: grid;
  gap: 10px;
}

.info {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--bordure);
}

.info:last-child {
  border-bottom: none;
}

.info span:first-child {
  color: var(--texte-doux);
  font-weight: 800;
}

.info span:last-child {
  color: var(--bleu-fonce);
  font-weight: 900;
  text-align: right;
}

.section {
  padding: 52px 0;
}

.section-entete {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 20px;
  margin-bottom: 24px;
}

.section-entete h2 {
  font-size: clamp(1.8rem, 3vw, 3rem);
}

.section-entete p {
  color: var(--texte-doux);
  margin: 8px 0 0;
  max-width: 740px;
}

.grille-deux {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.grille-trois {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.carte {
  background: rgba(255,255,255,.94);
  border: 1px solid var(--bordure);
  border-radius: var(--rayon);
  box-shadow: var(--ombre-douce);
  padding: 26px;
}

.carte h3 {
  font-size: 1.35rem;
  margin: 12px 0 8px;
}

.carte p {
  color: var(--texte-doux);
  margin-top: 0;
}

.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 20px;
}

.pills span {
  padding: 8px 11px;
  border-radius: 999px;
  background: var(--surface-soft);
  border: 1px solid var(--bordure);
  color: var(--texte-doux);
  font-size: .9rem;
  font-weight: 800;
}

.outils {
  background: rgba(255,255,255,.92);
  border: 1px solid var(--bordure);
  border-radius: var(--rayon);
  box-shadow: var(--ombre-douce);
  padding: 22px;
}

.toolbar {
  display: grid;
  grid-template-columns: 1.2fr .7fr .7fr;
  gap: 12px;
  margin-bottom: 20px;
}

.champ {
  display: grid;
  gap: 7px;
}

.champ label {
  color: var(--bleu-fonce);
  font-weight: 900;
  font-size: .94rem;
}

.champ input,
.champ select,
.champ textarea {
  width: 100%;
  border: 1px solid var(--bordure);
  border-radius: 16px;
  background: var(--surface-soft);
  color: var(--texte);
  padding: 13px 15px;
  outline: none;
  font: inherit;
}

.champ textarea {
  min-height: 150px;
  resize: vertical;
}

.champ input:focus,
.champ select:focus,
.champ textarea:focus {
  border-color: var(--bleu);
  background: white;
  box-shadow: 0 0 0 4px rgba(15,118,110,.12);
}

.empty-state {
  display: none;
  border: 1px dashed var(--bordure);
  border-radius: 22px;
  padding: 28px;
  color: var(--texte-doux);
  text-align: center;
  background: var(--surface-soft);
  margin-top: 16px;
}

.page-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
  align-items: start;
  padding: 28px 0 72px;
}

.sommaire {
  position: sticky;
  top: 100px;
  background: rgba(255,255,255,.92);
  border: 1px solid var(--bordure);
  border-radius: 26px;
  padding: 20px;
  box-shadow: var(--ombre-douce);
}

.sommaire strong {
  display: block;
  color: var(--bleu-fonce);
  margin-bottom: 12px;
  font-size: 1.05rem;
}

.sommaire a {
  display: block;
  padding: 10px 0;
  color: var(--texte-doux);
  border-bottom: 1px solid var(--bordure);
  font-weight: 800;
}

.sommaire a:last-child {
  border-bottom: none;
}

.sommaire a:hover {
  color: var(--bleu-fonce);
}

.contenu {
  display: grid;
  gap: 24px;
}

.section-carte {
  background: rgba(255,255,255,.94);
  border: 1px solid var(--bordure);
  border-radius: var(--rayon);
  box-shadow: var(--ombre-douce);
  padding: 28px;
}

.bloc {
  border-radius: 22px;
  border: 1px solid transparent;
  padding: 20px 22px;
  margin: 16px 0;
}

.bloc strong {
  display: block;
  color: var(--bleu-fonce);
  font-size: 1.06rem;
  margin-bottom: 8px;
}

.methode { background: var(--jaune-pale); border-color: #fde68a; }
.definition { background: var(--bleu-pale); border-color: #99f6e4; }
.attention { background: var(--rouge-pale); border-color: #fecaca; }
.python { background: var(--violet-pale); border-color: #ddd6fe; }

.fichiers {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.fichier {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 18px;
  min-height: 185px;
  border-radius: 22px;
  background: white;
  border: 1px solid var(--bordure);
  transition: .18s ease;
}

.fichier:hover {
  transform: translateY(-3px);
  box-shadow: var(--ombre-douce);
}

.icone-fichier {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  color: var(--bleu-fonce);
  background: var(--bleu-pale);
  font-weight: 950;
}

.fichier .bouton {
  width: fit-content;
  margin-top: auto;
  min-height: 38px;
  padding: 8px 13px;
  font-size: .88rem;
}

.lecteur-pdf {
  overflow: hidden;
  border-radius: 24px;
  border: 1px solid var(--bordure);
  background: #10231e;
  box-shadow: var(--ombre-douce);
}

.lecteur-barre {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  padding: 14px 16px;
  color: white;
  background: #10231e;
}

.lecteur-barre span {
  color: rgba(255,255,255,.82);
  font-weight: 800;
}

.lecteur-barre a {
  color: white;
  font-weight: 900;
  padding: 7px 11px;
  border-radius: 999px;
  background: rgba(255,255,255,.12);
}

iframe {
  display: block;
  width: 100%;
  height: 760px;
  border: none;
  background: white;
}

.code,
pre,
code {
  font-family: "JetBrains Mono", Consolas, "Courier New", monospace;
}

.code {
  overflow: auto;
  padding: 20px;
  border-radius: 20px;
  background: #10231e;
  color: #dff7ef;
  font-size: .92rem;
  line-height: 1.55;
}

.photo-cadre {
  overflow: hidden;
  border-radius: 34px;
  min-height: 380px;
  background: var(--surface);
  border: 1px solid rgba(255,255,255,.75);
  box-shadow: var(--ombre-douce);
}

.photo-cadre img {
  width: 100%;
  height: 100%;
  min-height: 380px;
  object-fit: cover;
}

footer {
  padding: 32px 0;
  border-top: 1px solid var(--bordure);
  color: var(--texte-doux);
  margin-top: 34px;
}

.pied {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* Liste de chapitres en accordéon */
.chapters-accordion {
  display: grid;
  gap: 12px;
}

.chapter-box {
  background: rgba(255,255,255,.96);
  border: 1px solid var(--bordure);
  border-radius: 22px;
  box-shadow: var(--ombre-douce);
  overflow: hidden;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.chapter-box:hover {
  transform: translateY(-2px);
  border-color: rgba(15,118,110,.22);
}

.chapter-toggle {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--texte);
  font: inherit;
  padding: 0;
  cursor: pointer;
  text-align: left;
  box-shadow: none;
}

.chapter-toggle:hover {
  transform: none;
}

.chapter-toggle-inner {
  display: grid;
  grid-template-columns: 78px 132px 1fr 38px;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
}

.chapter-number {
  display: grid;
  place-items: center;
  min-height: 48px;
  border-radius: 16px;
  color: var(--bleu-fonce);
  background: var(--bleu-pale);
  font-weight: 950;
  letter-spacing: -0.03em;
}

.chapter-level {
  display: inline-flex;
  justify-content: center;
  padding: 7px 10px;
  border-radius: 999px;
  background: var(--vert-pale);
  color: var(--vert);
  font-size: .86rem;
  font-weight: 900;
}

.chapter-title {
  color: var(--bleu-fonce);
  font-size: 1.2rem;
  font-weight: 950;
  letter-spacing: -0.035em;
}

.chapter-chevron {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  color: var(--bleu-fonce);
  background: var(--surface-soft);
  font-size: 1.25rem;
  font-weight: 950;
  transition: transform .18s ease, background .18s ease;
}

.chapter-box.open .chapter-chevron {
  transform: rotate(45deg);
  background: var(--bleu-pale);
}

.chapter-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .22s ease;
  border-top: 1px solid transparent;
}

.chapter-box.open .chapter-panel {
  grid-template-rows: 1fr;
  border-top-color: var(--bordure);
}

.chapter-panel-inner {
  overflow: hidden;
  padding: 0 20px;
  background: linear-gradient(180deg, rgba(238,246,241,.75), rgba(255,255,255,.98));
}

.chapter-box.open .chapter-panel-inner {
  padding-bottom: 20px;
}

.chapter-panel p {
  color: var(--texte-doux);
  margin: 16px 0;
}

.chapter-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chapter-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 9px 14px;
  border-radius: 999px;
  font-weight: 900;
  border: 1px solid var(--bordure);
  color: var(--bleu-fonce);
  background: white;
}

.chapter-actions a:first-child {
  color: white;
  background: var(--bleu);
  border-color: var(--bleu);
}

.chapter-actions a:hover {
  transform: translateY(-1px);
  box-shadow: var(--ombre-douce);
}

.lien-inactif {
  color: var(--texte-doux) !important;
  background: var(--surface-soft) !important;
  border-color: var(--bordure) !important;
  pointer-events: none;
  opacity: .78;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 100;
  background: var(--bleu-fonce);
  color: white;
  padding: 10px 14px;
  border-radius: 999px;
  font-weight: 900;
}

.skip-link:focus {
  top: 16px;
}

@media (max-width: 980px) {
  .carte-hero,
  .page-layout,
  .grille-deux,
  .toolbar {
    grid-template-columns: 1fr;
  }

  .sommaire {
    position: static;
  }

  .grille-trois,
  .fichiers {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .navigation {
    flex-direction: column;
    align-items: flex-start;
    padding: 14px 0;
  }

  nav {
    justify-content: flex-start;
  }

  .hero {
    padding-top: 34px;
  }

  .carte-hero,
  .section-carte,
  .carte {
    padding: 22px;
  }

  .grille-trois,
  .fichiers {
    grid-template-columns: 1fr;
  }

  iframe {
    height: 560px;
  }

  .chapter-toggle-inner {
    grid-template-columns: 64px 1fr 34px;
    gap: 10px;
  }

  .chapter-number {
    min-height: 44px;
  }

  .chapter-level {
    grid-column: 2 / 3;
    width: fit-content;
  }

  .chapter-title {
    grid-column: 1 / 3;
    font-size: 1.1rem;
  }

  .chapter-chevron {
    grid-column: 3 / 4;
    grid-row: 1 / 3;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}


/* Gestion automatique des PDF absents */
.pdf-link-missing,
.fichier.pdf-missing {
  display: none !important;
}

.pdf-status {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: 16px;
  background: var(--surface-soft);
  border: 1px dashed var(--bordure);
  color: var(--texte-doux);
  font-weight: 800;
}

.fichiers:empty::after {
  content: "Aucun document PDF n’est encore disponible pour ce chapitre.";
  display: block;
  padding: 18px;
  border-radius: 18px;
  background: var(--surface-soft);
  color: var(--texte-doux);
  border: 1px dashed var(--bordure);
  font-weight: 800;
}



/* Pages de niveau simplifiées : accès direct aux chapitres */
.niveau-direct {
  padding: 42px 0 18px;
}

.niveau-direct-card {
  background: rgba(255,255,255,.92);
  border: 1px solid var(--bordure);
  border-radius: 28px;
  padding: 26px;
  box-shadow: var(--ombre-douce);
}

.niveau-direct-card h1 {
  margin: 10px 0 10px;
  font-size: clamp(2.1rem, 4vw, 3.4rem);
}

.niveau-direct-card p {
  max-width: 760px;
  color: var(--texte-doux);
  margin: 0;
  font-size: 1.08rem;
}

.section-chapitres-directe {
  padding-top: 22px;
}



/* Pages Première / Terminale sans bloc d'introduction */
.premier-bloc {
  padding-top: 34px;
}

.premier-bloc .section-entete {
  margin-bottom: 18px;
}

.premier-bloc .section-entete h2 {
  font-size: clamp(1.9rem, 3vw, 2.8rem);
}

@media (max-width: 720px) {
  .premier-bloc {
    padding-top: 22px;
  }
}



/* Accueil épuré */
.hero-accueil {
  padding: 42px 0 22px;
}

.accueil-epure {
  display: block;
  padding: 34px 38px;
}

.accueil-epure h1 {
  margin: 14px 0 22px;
  font-size: clamp(3rem, 8vw, 6.2rem);
}

.accueil-epure .ligne-boutons {
  margin-top: 0;
}

@media (max-width: 720px) {
  .accueil-epure {
    padding: 26px 22px;
  }

  .accueil-epure h1 {
    font-size: clamp(2.7rem, 14vw, 4.4rem);
  }
}



/* Rendu dynamique des parcours et chapitres */
.parcours-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.parcours-card {
  background: rgba(255,255,255,.96);
  border: 1px solid var(--bordure);
  border-radius: 26px;
  padding: 24px;
  box-shadow: var(--ombre-douce);
}

.parcours-card h2 {
  margin-bottom: 8px;
}

.parcours-card p {
  color: var(--texte-doux);
  margin: 0 0 18px;
}

.docs-groups {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.docs-group-title {
  width: 100%;
  color: var(--texte-doux);
  font-weight: 900;
  margin-top: 6px;
}

.pdf-link-missing {
  display: none !important;
}

.admin-warning {
  background: var(--jaune-pale);
  border: 1px solid #fde68a;
  color: var(--jaune);
  padding: 14px 16px;
  border-radius: 18px;
  font-weight: 800;
}

@media (max-width: 760px) {
  .parcours-grid {
    grid-template-columns: 1fr;
  }
}



/* Bouton admin discret dans le menu principal */
nav a.admin-link {
  color: var(--bleu-fonce);
  background: white;
  border: 1px solid var(--bordure);
}

nav a.admin-link:hover {
  color: white;
  background: var(--bleu-fonce);
  border-color: var(--bleu-fonce);
}



/* Correction V15 : centrage vertical des capsules de documents dans l'accordéon */
.chapter-panel-inner {
  padding-top: 18px;
}

.chapter-box.open .chapter-panel-inner {
  padding-top: 18px;
  padding-bottom: 22px;
}

.chapter-actions.docs-groups {
  align-items: center;
  min-height: 58px;
}

.chapter-actions.docs-groups a {
  align-self: center;
}



/* Rubrique NSI */
.chapter-box[data-theme="python"] .chapter-number {
  background: var(--violet-pale);
  color: var(--violet);
}

.chapter-box[data-theme="python"] .chapter-level {
  background: var(--bleu-pale);
  color: var(--bleu-fonce);
}