:root {
  --fond: #f4f6f8; --carte: #ffffff; --texte: #1d2733; --discret: #5b6776;
  --accent: #0b6e4f; --accent-texte: #ffffff; --bordure: #d9dee4;
  --bulle-moi: #e3f1ec; --bulle-bot: #ffffff; --alerte: #8a5300; --alerte-fond: #fff6e5;
  --erreur: #a12622; --erreur-fond: #fdecea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --fond: #12161b; --carte: #1a2027; --texte: #e6eaee; --discret: #9aa5b1;
    --accent: #3fb68b; --accent-texte: #0d1a14; --bordure: #2c343d;
    --bulle-moi: #1d3a30; --bulle-bot: #222a33; --alerte: #f0c27a; --alerte-fond: #2e2616;
    --erreur: #f2a19d; --erreur-fond: #3a1f1e;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--fond); color: var(--texte);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.cadre { max-width: 760px; margin: 0 auto; padding: 16px; min-height: 100vh; display: flex; flex-direction: column; gap: 12px; }
.entete { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
h1 { font-size: 1.25rem; margin: 0; }
.sous-titre { margin: 0; color: var(--discret); font-size: .9rem; }
.avis { background: var(--alerte-fond); color: var(--texte); border-left: 4px solid var(--alerte);
  padding: 10px 12px; border-radius: 6px; font-size: .85rem; }
.avis a { color: inherit; }
.connexion { display: flex; justify-content: center; padding: 48px 0; }
button { font: inherit; cursor: pointer; border-radius: 6px; }
.principal { background: var(--accent); color: var(--accent-texte); border: 0; padding: 10px 18px; font-weight: 600; }
.principal:disabled { opacity: .5; cursor: wait; }
.secondaire { background: transparent; color: var(--texte); border: 1px solid var(--bordure); padding: 8px 14px; }
.lien { background: none; border: 0; color: var(--discret); text-decoration: underline; padding: 4px; }
#ecran-chat { display: flex; flex-direction: column; gap: 8px; flex: 1; }
.fil { list-style: none; margin: 0; padding: 12px; flex: 1; overflow-y: auto; background: var(--carte);
  border: 1px solid var(--bordure); border-radius: 8px; min-height: 50vh; max-height: 65vh;
  display: flex; flex-direction: column; gap: 10px; }
.bulle { max-width: 85%; padding: 8px 12px; border-radius: 10px; white-space: pre-wrap; overflow-wrap: anywhere; }
.moi { align-self: flex-end; background: var(--bulle-moi); }
.bot { align-self: flex-start; background: var(--bulle-bot); border: 1px solid var(--bordure); }
.systeme { align-self: center; color: var(--discret); font-size: .85rem; }
.erreur { align-self: stretch; background: var(--erreur-fond); color: var(--erreur); border-radius: 6px; }
.sources { margin: 6px 0 0; padding-left: 18px; font-size: .85rem; color: var(--discret); }
.sources a { color: inherit; }
.recap { margin: 8px 0; border-collapse: collapse; font-size: .9rem; }
.recap th { text-align: left; padding: 2px 10px 2px 0; white-space: nowrap; color: var(--discret); font-weight: 500; vertical-align: top; }
.recap td { padding: 2px 0; }
.actions { display: flex; gap: 8px; margin-top: 8px; flex-wrap: wrap; }
.saisie { display: flex; gap: 8px; align-items: flex-end; }
textarea { flex: 1; font: inherit; padding: 8px 10px; border-radius: 6px; resize: vertical;
  border: 1px solid var(--bordure); background: var(--carte); color: var(--texte); }
.aide { margin: 0; font-size: .8rem; color: var(--discret); }
.attente::after { content: "…"; animation: points 1s steps(3, end) infinite; }
@keyframes points { 0% { content: "."; } 50% { content: ".."; } 100% { content: "..."; } }
@media (max-width: 520px) { .saisie { flex-direction: column; align-items: stretch; } .bulle { max-width: 95%; } }