/* Révisions S1 — barre de navigation partagée et réglages communs.
   Chaque page garde son propre système de couleurs ; la barre a ses jetons à elle (--sh-*). */
:root{
  --sh-bg:#FFFFFF; --sh-fg:#141A2E; --sh-muted:#5A6278; --sh-line:#DCE1EA;
  --sh-accent:#2340B8; --sh-accent-soft:#E6EBFB; --sh-mark-bg:#141A2E; --sh-mark-fg:#FFFFFF;
  --sh-h:52px;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --sh-bg:#121726; --sh-fg:#E6E9F2; --sh-muted:#9AA3BA; --sh-line:#262D42;
    --sh-accent:#93A6FF; --sh-accent-soft:#1D2550; --sh-mark-bg:#E6E9F2; --sh-mark-fg:#121726;
  }
}
:root[data-theme="dark"]{
  --sh-bg:#121726; --sh-fg:#E6E9F2; --sh-muted:#9AA3BA; --sh-line:#262D42;
  --sh-accent:#93A6FF; --sh-accent-soft:#1D2550; --sh-mark-bg:#E6E9F2; --sh-mark-fg:#121726;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0}
img,svg{max-width:100%}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--sh-accent);outline-offset:2px;border-radius:4px}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto!important} *,*::before,*::after{transition:none!important;animation:none!important}}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* bande au-dessus de la barre collante (encoche des téléphones) */
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:60;background:var(--sh-bg)}

#shell{min-height:var(--sh-h)}
.shell{position:sticky;top:env(safe-area-inset-top,0px);z-index:55;background:var(--sh-bg);color:var(--sh-fg);border-bottom:1px solid var(--sh-line);
  font-family:"Atkinson Hyperlegible",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;font-size:15px;line-height:1.2}
.shell-in{max-width:1180px;margin:0 auto;height:var(--sh-h);display:flex;align-items:center;gap:18px;
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.shell-brand{display:flex;align-items:center;gap:9px;color:inherit;text-decoration:none;font-weight:700;letter-spacing:.01em;flex:none}
.shell-mark{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:7px;background:var(--sh-mark-bg);color:var(--sh-mark-fg);
  font-family:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;font-weight:700;letter-spacing:-.02em}
.shell-nav{display:flex;align-items:center;gap:2px;flex:1;min-width:0;overflow-x:auto;scrollbar-width:none}
.shell-nav::-webkit-scrollbar{display:none}
.shell-nav a{color:var(--sh-muted);text-decoration:none;padding:.45rem .7rem;border-radius:7px;white-space:nowrap;font-weight:500}
.shell-nav a:hover{color:var(--sh-fg);background:var(--sh-accent-soft)}
.shell-nav a[aria-current="page"]{color:var(--sh-accent);background:var(--sh-accent-soft);font-weight:700}
.shell-tools{display:flex;align-items:center;gap:4px;flex:none;margin-left:auto}
.shell-btn{display:inline-grid;place-items:center;width:38px;height:38px;border:1px solid transparent;border-radius:8px;background:transparent;color:var(--sh-muted);cursor:pointer;padding:0}
.shell-btn:hover{color:var(--sh-fg);border-color:var(--sh-line)}
.shell-btn svg{width:20px;height:20px}
.shell-menu{display:none}
/* bouton de langue FR | EN */
.shell-lang{display:inline-flex;align-items:center;height:32px;border:1px solid var(--sh-line);border-radius:8px;padding:2px;margin-right:2px;
  font-family:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px;font-weight:700;letter-spacing:.02em}
.shell-lang a{display:inline-grid;place-items:center;min-width:30px;height:26px;padding:0 6px;border-radius:6px;color:var(--sh-muted);text-decoration:none}
.shell-lang a:hover{color:var(--sh-fg)}
.shell-lang a[aria-current="true"]{background:var(--sh-mark-bg);color:var(--sh-mark-fg)}
/* proposition de l'anglais (navigateur non francophone) */
.shell-hint{border-top:1px solid var(--sh-line);background:var(--sh-accent-soft)}
.shell-hint-in{max-width:1180px;margin:0 auto;display:flex;flex-wrap:wrap;align-items:center;gap:6px 14px;padding:8px max(16px,env(safe-area-inset-right,0px)) 8px max(16px,env(safe-area-inset-left,0px));font-size:14px}
.shell-hint-in span{flex:1 1 220px;min-width:0}
.shell-hint-in a{color:var(--sh-accent);font-weight:700}
.shell-hint-in button{font:inherit;color:var(--sh-muted);background:none;border:0;padding:4px 0;cursor:pointer;text-decoration:underline}
@media (max-width:640px){
  .shell-menu{display:inline-grid}
  .shell-nav{position:absolute;top:var(--sh-h);left:0;right:0;flex-direction:column;align-items:stretch;gap:0;background:var(--sh-bg);border-bottom:1px solid var(--sh-line);
    padding:6px max(16px,env(safe-area-inset-right,0px)) 10px max(16px,env(safe-area-inset-left,0px));display:none;box-shadow:0 12px 24px rgba(10,14,30,.12)}
  .shell-nav.open{display:flex}
  .shell-nav a{padding:.75rem .6rem}
}

@media print{
  #shell,.shell,.no-print{display:none!important}
  body::before{display:none}
}