/* En-tête collant : logo animé, navigation d'ancres, bascule de thème, langues, connexion. */
.entete {
  position: sticky; top: 0; z-index: 20; border-bottom: 1px solid transparent;
  background: color-mix(in srgb, var(--fond) 94%, transparent);
  transition: border-color 200ms;
}
.entete.est-defile { border-bottom-color: var(--trait); }
.entete-ligne { display: flex; align-items: center; gap: 12px; min-height: 68px; }
.logo { display: block; line-height: 0; margin-right: auto; }
.logo-svg { display: block; width: 172px; height: 32px; }
.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.os-vif { fill: var(--logo-arc); }
.os-profond { fill: var(--logo-barre); }
.nav-principale { display: none; gap: 4px; }
.nav-principale a { padding: 8px 12px; border-radius: 8px; color: var(--texte); text-decoration: none; font-size: 0.9375rem; font-weight: 500; }
.nav-principale a:hover { background: var(--surface-2); color: var(--marque-texte); }
.entete-actions { display: flex; align-items: center; gap: 8px; }
.lien-connexion { background: transparent; border: 1.5px solid var(--marque); color: var(--marque-texte); }
.lien-connexion:hover, .lien-connexion:active { background: var(--marque); border-color: var(--marque); color: var(--sur-marque); }
.entete .bouton { min-height: 40px; padding: 0 16px; font-size: 0.9375rem; }

.bascule-theme {
  display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; padding: 0;
  border: 1px solid var(--trait); border-radius: 10px; background: var(--surface); color: var(--texte); cursor: pointer;
  transition: border-color 150ms, color 150ms;
}
.bascule-theme:hover { border-color: var(--marque); color: var(--marque-texte); }
.bascule-theme svg { width: 20px; height: 20px; }
.bascule-theme .icone-lune { display: none; }
:root[data-theme="dark"] .bascule-theme .icone-soleil { display: none; }
:root[data-theme="dark"] .bascule-theme .icone-lune { display: block; }

.langues { display: inline-flex; padding: 3px; border: 1px solid var(--trait); border-radius: 10px; gap: 2px; background: var(--surface); }
.langues a {
  display: inline-flex; align-items: center; justify-content: center; min-width: 36px; min-height: 32px; padding: 0 6px;
  border-radius: 7px; color: var(--texte); font-size: 0.8125rem; font-weight: 600; text-decoration: none;
  transition: background-color 150ms, color 150ms;
}
.langues a:hover { background: var(--surface-2); color: var(--marque-texte); }
.langues a[aria-current="true"], .langues a[aria-current="true"]:hover { background: var(--marque); color: var(--sur-marque); }
@media (max-width: 400px) { .entete-actions { gap: 6px; } .entete .bouton { padding: 0 10px; font-size: 0.875rem; } .langues a { min-width: 30px; } }
@media (min-width: 1080px) {
  .nav-principale { display: flex; margin: 0 auto 0 16px; }
  .nav-principale a { padding: 8px; }
  .logo { margin-right: 0; }
  .entete-actions { gap: 12px; }
}
@media (min-width: 1240px) {
  .nav-principale { margin-left: 24px; }
  .nav-principale a { padding: 8px 12px; }
}

@media (prefers-reduced-motion: no-preference) {
  .entete .logo-svg { animation: logo-revele 700ms ease-out both; }
  @keyframes logo-revele { from { clip-path: inset(0 100% 0 0); } to { clip-path: inset(0 0 0 0); } }
  .bouton-primaire:hover { translate: 0 -1px; }
}
.entete-actions .bascule-theme { position: relative; margin-left: 12px; }
.entete-actions .bascule-theme::before { content: ""; position: absolute; left: -12px; top: 8px; bottom: 8px; width: 1px; background: var(--trait); }
.logo { flex: none; }
@media (max-width: 479px) {
  .logo-svg { width: 124px; height: 23px; }
  .entete-actions .bascule-theme { margin-left: 8px; }
  .entete-actions .bascule-theme::before { left: -8px; }
  .entete .langues a { min-width: 28px; padding: 0 4px; }
  .entete .lien-connexion { padding: 0 10px; font-size: 0.875rem; }
}
@media (max-width: 374px) { .entete .langues { display: none; } }
@media (max-width: 400px) {
  .logo-svg { width: 120px; height: 22px; }
  .entete .langues a { min-width: 26px; padding: 0 3px; }
  .entete .lien-connexion { padding: 0 8px; }
  .entete-actions .bascule-theme { margin-left: 6px; }
  .entete-actions .bascule-theme::before { left: -6px; }
}
@media (max-width: 400px) { .entete-actions { gap: 4px; } .entete .lien-connexion { font-size: 0.8125rem; } }