:root {
  --fond: #f6f8f7;
  --surface: #ffffff;
  --texte: #1b2a2a;
  --texte-doux: #51615f;
  --bord: #d9e2e0;
  --accent: #0f6b66;
  --accent-fonce: #0a4f4b;
  --sur-accent: #ffffff;
  --python: #2f6f9f;
  --r: #7a4fa3;
  --quarto: #a2602a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fond: #101817;
    --surface: #18211f;
    --texte: #e6eeec;
    --texte-doux: #a3b3b0;
    --bord: #2b3835;
    --accent: #3fb3aa;
    --accent-fonce: #1d5f5a;
    --sur-accent: #06201e;
    --python: #7fb4dc;
    --r: #bfa0e0;
    --quarto: #e0a878;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--fond);
  color: var(--texte);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.55;
}
.conteneur { max-width: 60rem; margin: 0 auto; padding: 0 1rem; }
.bandeau { background: var(--accent-fonce); color: #fff; padding: 2.25rem 0 2rem; }
.bandeau .marque { margin: 0; font-size: .85rem; letter-spacing: .12em; text-transform: uppercase; opacity: .85; }
.bandeau h1 { margin: .15rem 0 .5rem; font-size: clamp(1.8rem, 5vw, 2.6rem); line-height: 1.15; }
.bandeau .accroche { margin: 0; max-width: 38rem; opacity: .92; }
.bandeau a { color: #fff; }
main { padding: 1.5rem 1rem 2.5rem; }
h2 { font-size: 1.3rem; margin: 1.75rem 0 .5rem; }
h3 { font-size: 1.15rem; margin: .5rem 0 .25rem; }
.note { color: var(--texte-doux); margin: 0 0 1rem; max-width: 44rem; }
.grille { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); }
.carte {
  display: flex; flex-direction: column;
  background: var(--surface); border: 1px solid var(--bord); border-radius: .75rem;
  padding: 1.1rem 1.1rem 1.2rem; color: inherit; text-decoration: none;
  transition: border-color .15s, transform .15s;
}
.carte:hover, .carte:focus-visible { border-color: var(--accent); transform: translateY(-2px); outline: none; }
.carte p { margin: 0 0 1rem; color: var(--texte-doux); flex: 1; }
.etiquette { align-self: flex-start; font-size: .75rem; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; }
.etiquette.python { color: var(--python); }
.etiquette.r { color: var(--r); }
.etiquette.quarto { color: var(--quarto); }
.bouton {
  align-self: flex-start; background: var(--accent); color: var(--sur-accent);
  padding: .55rem .95rem; border-radius: .5rem; font-weight: 600;
}
.bouton.secondaire { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.liste { padding-left: 1.2rem; max-width: 46rem; }
.liste li { margin: .4rem 0; }
.lien { color: var(--accent); font-weight: 600; }
.pied { border-top: 1px solid var(--bord); color: var(--texte-doux); font-size: .9rem; padding: 1rem 0 1.5rem; }
.pied p { margin: 0; }

/* Page d'aide */
.aide h2 { border-top: 1px solid var(--bord); padding-top: 1.25rem; }
.aide h2:first-of-type { border-top: 0; padding-top: 0; }
.aide p, .aide ol, .aide ul, .aide dl { max-width: 46rem; }
.aide li { margin: .35rem 0; }
.aide dt { font-weight: 600; margin-top: .9rem; }
.aide dd { margin: .2rem 0 0; color: var(--texte-doux); }
code, pre {
  font-family: ui-monospace, "Cascadia Mono", Consolas, "Liberation Mono", monospace; font-size: .9em;
}
code { background: var(--surface); border: 1px solid var(--bord); border-radius: .3rem; padding: .05rem .3rem; }
pre {
  background: var(--surface); border: 1px solid var(--bord); border-radius: .5rem;
  padding: .8rem 1rem; overflow-x: auto; max-width: 46rem;
}
pre code { background: none; border: 0; padding: 0; }
.sommaire { display: flex; flex-wrap: wrap; gap: .5rem 1rem; padding: 0; list-style: none; margin: 1rem 0 0; }
.sommaire a { color: var(--accent); }