:root{
  --bg:#f8f9fb; --surface:#ffffff; --soft:#f3f4f6; --ink:#111827; --muted:#4b5563;
  --line:#e5e7eb; --line-strong:#d1d5db; --primary:#111827; --primary-ink:#ffffff;
  --accent:#1d4ed8; --ok:#15803d; --radius:12px;
  --shadow:0 1px 2px rgba(16,24,40,.05),0 1px 3px rgba(16,24,40,.06);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0b0d12; --surface:#13161d; --soft:#1b1f28; --ink:#e5e7eb; --muted:#9ca3af;
    --line:#262b36; --line-strong:#353b48; --primary:#f3f4f6; --primary-ink:#111827;
    --accent:#93b4ff; --ok:#4ade80; --shadow:none;
  }
}
:root[data-theme="dark"]{
  --bg:#0b0d12; --surface:#13161d; --soft:#1b1f28; --ink:#e5e7eb; --muted:#9ca3af;
  --line:#262b36; --line-strong:#353b48; --primary:#f3f4f6; --primary-ink:#111827;
  --accent:#93b4ff; --ok:#4ade80; --shadow:none;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);
  font:17px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
a{color:inherit;text-underline-offset:3px}
main a:not(.btn){color:var(--accent)}
.wrap{max-width:880px;margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-999px}
.skip:focus{left:16px;top:16px;z-index:10;background:var(--primary);color:var(--primary-ink);padding:8px 12px;border-radius:8px}

/* En-tête */
.topbar{background:var(--surface);border-bottom:1px solid var(--line)}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:60px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;text-decoration:none;letter-spacing:-.01em}
.brand-mark{display:grid;place-items:center;width:30px;height:30px;border-radius:7px;background:var(--primary);color:var(--primary-ink);font-size:.72rem;font-weight:800}
.topnav{display:flex;gap:2px;align-items:center;font-size:.92rem}
.topnav a{white-space:nowrap;text-decoration:none;padding:6px 10px;border-radius:8px;color:var(--muted)}
.topnav a:hover{color:var(--ink);background:var(--soft)}
.topnav a[aria-current="page"]{color:var(--ink);font-weight:600}
.topnav .lang{border:1px solid var(--line-strong);color:var(--ink);margin-left:6px}

/* Héros */
.hero{background:var(--surface);border-bottom:1px solid var(--line);padding:40px 0 36px}
.kicker{display:block;font-size:.8rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.kicker a{color:inherit}
h1{font-size:clamp(1.9rem,5.5vw,2.8rem);line-height:1.12;margin:10px 0 12px;letter-spacing:-.025em}
h1 .hl{color:var(--accent)}
.lead{font-size:1.1rem;max-width:52ch;color:var(--muted);margin:0}

/* Carte du code */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.code-card{margin-top:28px;padding:28px 24px;display:grid;gap:16px;text-align:center}
.code-label{font-size:.9rem;color:var(--muted);margin:0}
.row{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;align-items:center}
.code-value{font:700 clamp(2.2rem,9vw,3.2rem)/1 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  letter-spacing:.16em;padding:14px 22px;background:var(--soft);border:1px dashed var(--line-strong);border-radius:10px;user-select:all}
.btn{appearance:none;cursor:pointer;font-family:inherit;font-weight:600;font-size:1rem;line-height:1;
  padding:14px 18px;border-radius:10px;min-height:48px;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border:1px solid transparent;transition:background-color .15s,border-color .15s}
.btn-copy{background:var(--primary);color:var(--primary-ink);border-color:var(--primary)}
.btn-copy:hover{opacity:.9}
.btn-go,.btn-ghost{background:var(--surface);color:var(--ink);border-color:var(--line-strong)}
.btn-go:hover,.btn-ghost:hover{background:var(--soft)}
.btn:focus-visible,.topnav a:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.status{margin:0;color:var(--ok);font-weight:600}
.status:empty{display:none}
.fine{font-size:.86rem;color:var(--muted);margin:0}
.verified{display:block;font-size:.86rem;color:var(--muted);margin:0}
.verified::first-letter{color:var(--ok)}

/* Sections */
main section{padding:44px 0 0}
h2{font-size:clamp(1.35rem,3.4vw,1.7rem);line-height:1.25;margin:0 0 14px;letter-spacing:-.015em}
h3{font-size:1.05rem;margin:0 0 6px}
p{margin:0 0 14px}
.steps{list-style:none;padding:0;margin:0;display:grid;gap:10px;counter-reset:s}
.steps li{counter-increment:s;padding:18px 18px 18px 64px;position:relative}
.steps li::before{content:counter(s);position:absolute;left:18px;top:17px;width:30px;height:30px;border-radius:50%;
  background:var(--soft);border:1px solid var(--line-strong);color:var(--ink);font-weight:700;font-size:.9rem;display:grid;place-items:center}
.steps p{margin:0;color:var(--muted)}
.grid{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.grid .card{padding:20px;display:flex;flex-direction:column;gap:10px}
.grid .card p{margin:0;color:var(--muted);flex:1}
.facts{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(170px,1fr))}
.fact{padding:16px 18px}
.fact strong{display:block;font-size:1.4rem;line-height:1.2;letter-spacing:-.01em}
.fact span{color:var(--muted);font-size:.9rem}
.note{padding:18px 20px;border-left:3px solid var(--accent)}
.note p:last-child{margin:0}
details{margin:0 0 8px}
summary{cursor:pointer;font-weight:600;padding:16px 44px 16px 18px;list-style:none;position:relative}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";position:absolute;right:18px;top:14px;font-size:1.2rem;font-weight:500;color:var(--muted)}
details[open] summary::after{content:"–"}
details .ans{padding:0 18px 16px;color:var(--muted)}
details .ans p{margin:0}
.cta{margin:48px 0 0;padding:28px;text-align:center}
.cta p{margin:0 0 16px}
.related{margin-top:24px}
.related a{font-weight:600}

footer{margin-top:48px;padding:32px 0 48px;color:var(--muted);font-size:.86rem;border-top:1px solid var(--line);background:var(--surface)}
footer p{margin:0 0 8px}
footer nav{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:12px}
footer nav a{color:var(--ink)}

/* Barre fixe sur cellulaire */
.sticky{display:none}
@media (max-width:720px){
  body{padding-bottom:84px}
  .sticky{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:5;gap:8px;align-items:center;
    padding:10px 12px calc(10px + env(safe-area-inset-bottom));background:var(--surface);border-top:1px solid var(--line);
    box-shadow:0 -4px 16px rgba(0,0,0,.06)}
  .sticky .sc{flex:1;min-width:0;line-height:1.1}
  .sticky .sc span{display:block;font-size:.72rem;color:var(--muted)}
  .sticky .sc strong{font:700 1.2rem ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.1em}
  .sticky .btn{min-height:44px;padding:11px 13px;font-size:.92rem}
  .topnav .hide-sm{display:none}
  .hero{padding:28px 0 28px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.btn{transition:none}}