/* Feuille de style unique : pas de police ni de ressource externe (politique de contenu stricte). */
:root { --encre: #1f2328; --discret: #59636e; --fond: #ffffff; --trait: #d0d7de; --accent: #1f6f43; --alerte: #9a3412; }
@media (prefers-color-scheme: dark) {
  :root { --encre: #e6edf3; --discret: #9198a1; --fond: #0d1117; --trait: #30363d; --accent: #4ac26b; --alerte: #f0883e; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; color: var(--encre); background: var(--fond); }
main { max-width: 860px; margin: 0 auto; padding: 16px; }
.entete { border-bottom: 1px solid var(--trait); padding: 12px 16px; display: flex; gap: 12px; align-items: baseline; flex-wrap: wrap; }
.marque { font-weight: 700; font-size: 1.2rem; color: var(--encre); text-decoration: none; }
.sous-titre, .discret, small { color: var(--discret); }
small { display: block; font-size: 0.85rem; }
.pied { border-top: 1px solid var(--trait); padding: 16px; text-align: center; font-size: 0.9rem; }
a { color: var(--accent); }
h1 { font-size: 1.6rem; line-height: 1.25; }
.choix { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); margin: 24px 0; }
.carte { display: block; border: 1px solid var(--trait); border-radius: 8px; padding: 16px; text-decoration: none; color: var(--encre); }
.carte strong { display: block; margin-bottom: 4px; color: var(--accent); }
.encart { border-left: 4px solid var(--accent); padding: 8px 12px; background: color-mix(in srgb, var(--accent) 8%, transparent); }
.alerte, .erreurs, .errorlist { color: var(--alerte); }
.errorlist { margin: 4px 0; padding-left: 18px; }
label { display: block; font-weight: 600; margin-bottom: 4px; }
label.ligne { font-weight: 400; display: flex; gap: 8px; align-items: center; }
input[type=text], input[type=email], input[type=number], select, textarea {
  width: 100%; max-width: 480px; padding: 8px; border: 1px solid var(--trait); border-radius: 6px; font: inherit; color: inherit; background: var(--fond);
}
input[type=number] { max-width: 90px; }
button { font: inherit; padding: 10px 18px; border: 0; border-radius: 6px; background: var(--accent); color: #fff; cursor: pointer; }
fieldset { border: 1px solid var(--trait); border-radius: 6px; margin: 12px 0; }
.catalogue { width: 100%; border-collapse: collapse; margin: 16px 0; }
.catalogue th, .catalogue td { border-bottom: 1px solid var(--trait); padding: 6px 4px; text-align: left; }
.catalogue tr.vide { color: var(--discret); }
.messages { padding-left: 18px; }
.piege { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
@media (max-width: 600px) { .catalogue th:nth-child(2), .catalogue td:nth-child(2) { display: none; } }
.menu { margin-left: auto; }
.bouton { display: inline-block; padding: 10px 18px; border-radius: 6px; background: var(--accent); color: #fff; text-decoration: none; }
.ligne-titre { display: flex; gap: 10px; align-items: center; }
.vignette { flex: none; width: 40px; height: auto; border: 1px solid var(--trait); border-radius: 2px; }
/* Catalogue et fiche des livres */
.livres { list-style: none; padding: 0; margin: 12px 0 28px; display: grid; gap: 20px 16px; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
.livre-carte a { display: block; color: var(--encre); text-decoration: none; }
.livre-carte a:hover strong, .livre-carte a:focus strong { text-decoration: underline; }
.livre-carte img, .sans-couverture { display: block; width: 100%; max-width: 160px; height: auto; margin-bottom: 6px; border: 1px solid var(--trait); border-radius: 4px; }
.sans-couverture { aspect-ratio: 3 / 4; background: var(--trait); }
.livre-carte.vide { opacity: 0.6; }
.fiche { display: grid; gap: 24px; grid-template-columns: minmax(0, 320px) 1fr; align-items: start; margin-top: 8px; }
.fiche h1 { margin-top: 0; }
.fiche-couverture { width: 100%; height: auto; border: 1px solid var(--trait); border-radius: 4px; }
.caracteristiques { display: grid; grid-template-columns: max-content 1fr; gap: 4px 12px; }
.caracteristiques dt { color: var(--discret); }
.caracteristiques dd { margin: 0; }
.resume { max-width: 65ch; }
@media (max-width: 640px) { .fiche { grid-template-columns: 1fr; } .fiche-couverture { max-width: 260px; } }