* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; background: #f7f7fb; color: #222; }
header { background: #0e162d; color: white; padding: 20px; }
header h1 { margin: 0 0 6px 0; font-size: 1.6rem; }
header .source { margin: 8px 0 0 0; }
header .back { display: inline-block; margin-top: 8px; color: #fff; text-decoration: underline; }

main { max-width: 900px; margin: 0 auto; padding: 20px; }
.url-form { display: grid; grid-template-columns: 1fr auto; gap: 10px; align-items: end; }
.url-form label { grid-column: 1 / -1; font-weight: 600; }
.url-form input { padding: 10px; border: 1px solid #ccd; border-radius: 6px; }
.url-form button { padding: 10px 16px; background: #2b50aa; color: white; border: none; border-radius: 6px; cursor: pointer; }
.url-form button:hover { background: #1f3a7f; }

.alert.error { background: #ffe6e6; color: #8a1a1a; border: 1px solid #ffb3b3; padding: 10px; border-radius: 6px; margin-top: 12px; }
.tips { margin-top: 24px; background: #fff; border: 1px solid #e3e3ee; border-radius: 8px; padding: 16px; }

.chat { display: flex; flex-direction: column; gap: 14px; }
.bubble { max-width: 800px; padding: 12px 14px; border-radius: 10px; background: #fff; border: 1px solid #e3e3ee; }
.bubble.expert { border-left: 4px solid #2b50aa; }
.bubble.user { background: #f0f5ff; border-left: 4px solid #7aa2ff; }
.role { font-weight: 700; margin-bottom: 6px; font-size: 0.95rem; }
.message { white-space: pre-wrap; line-height: 1.45; }

footer { max-width: 900px; margin: 10px auto 40px; padding: 0 20px; color: #555; }

.hidden { display: none; }
.loading { opacity: 0.6; pointer-events: none; }
.chat { margin-top: 1rem; }
.bubble.expert { background: #f0f7ff; }
.bubble.user { background: #f9f9f9; }
.error { color: #b00020; }
.controls { display: flex; gap: .5rem; align-items: center; }
.turn-controls { margin-top: .25rem; font-size: .85em; display: flex; gap: .4rem; align-items: center; }
.turn-controls label { opacity: 0.8; }
.variant-toggle { font-size: .8em; padding: .15rem .4rem; border: 1px solid #ccc; border-radius: 4px; background: #fff; cursor: pointer; }
.variant-toggle.is-correct { border-color: #2e7d32; color: #2e7d32; background: #e8f5e9; }
.variant-toggle.is-incorrect { border-color: #b26a00; color: #b26a00; background: #fff3e0; }
.variant-toggle:focus { outline: 2px solid #6aa0ff; outline-offset: 1px; }
/* Choix utilisateur (deux variantes) */
.choice-grid { margin: .5rem 0 1rem; }
.choice-card { border: 1px solid #dee2e6; border-radius: .5rem; background: #fff; transition: box-shadow .15s ease, transform .05s ease; }
.choice-card:hover { box-shadow: 0 .25rem .75rem rgba(0,0,0,.06); }
.choice-card:active { transform: scale(0.997); }
.choice-label { font-weight: 600; opacity: .8; margin-bottom: .25rem; display: inline-block; }
.message.correct { background-color: var(--bs-success-bg-subtle, #d1e7dd); }
.message.incorrect { background-color: var(--bs-danger-bg-subtle, #f8d7da); }

/* Bulles Expert à largeur variable, adaptées au contenu */
.bubble .message {
  display: inline-block;
  /* largeur qui s'adapte au contenu, sans dépasser la zone lisible */
  width: -moz-fit-content;
  width: fit-content;
  max-width: min(90%, 70ch);
  /* gestion des retours et césures pour les textes longs */
  white-space: pre-wrap;
  word-break: break-word;
}
/* petit espacement vertical entre les segments d'une même prise de parole */
.bubble .message + .message { margin-top: .25rem; }

/* Tabs (URL / Fichier) : taille/espacement réduits et couleurs inversées (actif bleu, inactif neutre) */
#inputTabs { gap: .5rem; }
#inputTabs .nav-item + .nav-item { margin-left: .5rem; }
#inputTabs.nav-tabs { border-bottom: 1px solid transparent; }
#inputTabs.nav-tabs .nav-link {
  padding: .25rem .6rem; /* plus petit que le défaut Bootstrap */
  font-size: .9rem;
  line-height: 1.2;
  color: var(--bs-primary);
  background-color: transparent;
  border: 1px solid transparent;
  border-top-left-radius: .375rem;
  border-top-right-radius: .375rem;
}
#inputTabs.nav-tabs .nav-link:hover,
#inputTabs.nav-tabs .nav-link:focus {
  background-color: var(--bs-primary-bg-subtle, rgba(13,110,253,.1));
  color: var(--bs-primary);
}
#inputTabs.nav-tabs .nav-link.active,
#inputTabs.nav-tabs .nav-item.show .nav-link {
  color: #fff;
  background-color: var(--bs-primary);
  border-color: var(--bs-primary) var(--bs-primary) transparent; /* pas de bordure bas pour fondre avec le contenu */
}