/* ===== Blog OF Système — feuille de style commune ===== */
:root{
  --ink:#0F172A; --ink-2:#0B1220; --paper:#FFFFFF;
  --bleu:#1E56F0; --bleu-deep:#153FC7;
  --magenta:#EC1E79; --magenta-deep:#C4135F;
  --slate-700:#334155; --slate-600:#475569; --slate-500:#64748B;
  --slate-400:#94A3B8; --slate-300:#CBD5E1; --slate-200:#E2E8F0;
  --slate-100:#F1F5F9; --slate-50:#F8FAFC; --line:#E7EDF5;
  --shadow-sm:0 1px 2px rgba(15,23,42,.06), 0 1px 3px rgba(15,23,42,.05);
  --shadow-md:0 10px 30px -12px rgba(15,23,42,.18);
  --shadow-lg:0 30px 60px -20px rgba(15,23,42,.28);
  --radius:16px; --radius-sm:11px; --maxw:1180px;
  --mono:"JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Inter",system-ui,-apple-system,sans-serif;
  color:var(--ink); background:var(--paper); line-height:1.65;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.eyebrow{font-family:var(--mono);font-size:12px;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--bleu-deep)}
h1,h2,h3{letter-spacing:-.03em;line-height:1.12;font-weight:800}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:9px;font-weight:600;font-size:15px;padding:13px 22px;border-radius:11px;border:1px solid transparent;cursor:pointer;transition:transform .18s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn-primary{background:linear-gradient(180deg,var(--bleu) 0%,var(--bleu-deep) 100%);color:#fff;box-shadow:0 8px 20px -8px rgba(37,99,235,.6)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 30px -8px rgba(37,99,235,.7)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--slate-200)}
.btn-ghost:hover{border-color:var(--slate-400);transform:translateY(-2px)}
.btn-lg{padding:16px 28px;font-size:16px;border-radius:12px}

/* ---------- Nav ---------- */
header.nav{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.82);backdrop-filter:saturate(160%) blur(14px);-webkit-backdrop-filter:saturate(160%) blur(14px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:70px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:19px;letter-spacing:-.02em}
.brand .emblem-tile{width:44px;height:44px;display:flex;align-items:center;justify-content:center;flex:0 0 auto}
.brand .emblem-tile img{width:44px;height:44px;object-fit:contain}
.brand .mg{color:var(--magenta)}
.nav-links{display:flex;align-items:center;gap:34px}
.nav-links a.link{font-size:14.5px;font-weight:500;color:var(--slate-600);transition:color .18s}
.nav-links a.link:hover{color:var(--ink)}
.nav-links a.link.active{color:var(--bleu-deep)}
.menu-btn{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.menu-btn span{width:22px;height:2px;background:var(--ink);border-radius:2px}

/* ---------- Blog index hero ---------- */
.blog-hero{padding:72px 0 40px;background:linear-gradient(180deg,var(--slate-50),#fff)}
.blog-hero .eyebrow{display:block;margin-bottom:14px}
.blog-hero h1{font-size:clamp(32px,5vw,52px);max-width:760px}
.blog-hero p{font-size:19px;color:var(--slate-600);max-width:640px;margin-top:16px}

/* ---------- Filters ---------- */
.filters{display:flex;flex-wrap:wrap;gap:10px;margin:34px 0 8px}
.filter{font-size:14px;font-weight:600;padding:9px 16px;border-radius:999px;border:1px solid var(--slate-200);background:#fff;color:var(--slate-600);cursor:pointer;transition:all .18s}
.filter:hover{border-color:var(--slate-400)}
.filter.active{background:var(--ink);color:#fff;border-color:var(--ink)}

/* ---------- Card grid ---------- */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px;padding:40px 0 96px}
.card{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;box-shadow:var(--shadow-sm);transition:transform .2s ease,box-shadow .2s ease}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.card .thumb{aspect-ratio:16/9;background:var(--slate-100);object-fit:cover;width:100%}
.card .body{padding:20px 22px 24px;display:flex;flex-direction:column;flex:1}
.card .tag{font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--bleu-deep);margin-bottom:10px}
.card h3{font-size:19px;line-height:1.25;margin-bottom:10px}
.card p{font-size:14.5px;color:var(--slate-600);flex:1}
.card .meta{margin-top:16px;font-size:13px;color:var(--slate-500);display:flex;gap:12px}

/* ---------- Article ---------- */
.article-head{padding:44px 0 24px;background:linear-gradient(180deg,var(--slate-50),#fff)}
.breadcrumb{font-size:13.5px;color:var(--slate-500);margin-bottom:22px;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.breadcrumb a:hover{color:var(--ink)}
.breadcrumb .sep{color:var(--slate-300)}
.article-head .tag{font-family:var(--mono);font-size:12px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--magenta-deep)}
.article-head h1{font-size:clamp(30px,4.6vw,50px);margin:14px 0 20px;max-width:900px}
.article-meta{display:flex;gap:20px;flex-wrap:wrap;align-items:center;font-size:14px;color:var(--slate-600)}
.article-meta .who{display:flex;align-items:center;gap:9px;font-weight:600;color:var(--ink)}
.article-meta .avatar{width:32px;height:32px;border-radius:8px;background:linear-gradient(160deg,#0F172A,#0B1220);display:flex;align-items:center;justify-content:center;color:#fff;font-size:13px;font-weight:800}
.hero-img{width:100%;aspect-ratio:16/8;object-fit:cover;border-radius:var(--radius);margin:30px 0 0;box-shadow:var(--shadow-md)}

.article-layout{display:grid;grid-template-columns:280px minmax(0,1fr);gap:56px;padding:48px 0 40px;align-items:start}
.article-layout .toc{order:-1}
.article-body{max-width:760px;font-size:17.5px;color:var(--slate-700)}
.article-body>p{margin:0 0 22px}
.article-body h2{font-size:clamp(24px,3vw,32px);color:var(--ink);margin:52px 0 18px;scroll-margin-top:90px}
.article-body h2 .num{color:var(--bleu);font-variant-numeric:tabular-nums;margin-right:10px}
.article-body h3{font-size:21px;color:var(--ink);margin:34px 0 12px}
.article-body ul,.article-body ol{margin:0 0 22px;padding-left:24px}
.article-body li{margin:0 0 9px}
.article-body a{color:var(--bleu-deep);font-weight:600;text-decoration:underline;text-underline-offset:2px}
.article-body strong{color:var(--ink);font-weight:700}
.article-body figure{margin:34px 0}
.article-body figure img{width:100%;border-radius:var(--radius);box-shadow:var(--shadow-sm);border:1px solid var(--line)}
.article-body figcaption{font-size:13.5px;color:var(--slate-500);text-align:center;margin-top:10px}

/* Encadré "À retenir" */
.callout{border:1px solid var(--line);border-left:4px solid var(--bleu);background:var(--slate-50);border-radius:12px;padding:20px 24px;margin:30px 0;font-size:16px}
.callout .lbl{font-family:var(--mono);font-size:11.5px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--bleu-deep);display:block;margin-bottom:8px}
.callout.warn{border-left-color:var(--magenta)}
.callout.warn .lbl{color:var(--magenta-deep)}

/* Tableau */
.article-body .table-wrap{overflow-x:auto;margin:30px 0;border:1px solid var(--line);border-radius:12px}
.article-body table{width:100%;border-collapse:collapse;font-size:15px;min-width:520px}
.article-body th{background:var(--ink);color:#fff;text-align:left;padding:13px 16px;font-weight:600;font-size:13.5px}
.article-body td{padding:12px 16px;border-top:1px solid var(--line);color:var(--slate-700)}
.article-body tr:nth-child(even) td{background:var(--slate-50)}

/* Checklist / modèle */
.checklist{border:1px solid var(--line);border-radius:var(--radius);padding:26px 28px;margin:34px 0;background:#fff;box-shadow:var(--shadow-sm)}
.checklist .lbl{font-family:var(--mono);font-size:11.5px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--magenta-deep);display:block;margin-bottom:14px}
.checklist ul{list-style:none;padding:0;margin:0}
.checklist li{position:relative;padding-left:30px;margin:0 0 12px;font-size:16px}
.checklist li::before{content:"✓";position:absolute;left:0;top:0;width:20px;height:20px;background:linear-gradient(180deg,var(--bleu),var(--bleu-deep));color:#fff;border-radius:6px;font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center}

/* FAQ */
.faq{margin:44px 0}
.faq h2{font-size:clamp(24px,3vw,32px);margin-bottom:20px}
.faq details{border:1px solid var(--line);border-radius:12px;padding:0;margin:0 0 12px;background:#fff;overflow:hidden}
.faq summary{list-style:none;cursor:pointer;padding:18px 22px;font-weight:600;font-size:17px;color:var(--ink);display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:22px;color:var(--bleu);font-weight:400;transition:transform .2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details .a{padding:0 22px 20px;color:var(--slate-600);font-size:16px}

/* Sources */
.sources{margin:44px 0}
.sources h2{font-size:clamp(24px,3vw,32px);margin-bottom:10px}
.sources .intro{font-size:15px;color:var(--slate-600);margin:0 0 24px;max-width:680px;line-height:1.6}
.sources ol{list-style:none;padding:0;margin:0;counter-reset:src}
.sources li{counter-increment:src;position:relative;padding:22px 26px 22px 66px;margin:0 0 16px;border:1px solid var(--line);border-radius:14px;background:#fff;box-shadow:var(--shadow-sm)}
.sources li::before{content:counter(src);position:absolute;left:22px;top:22px;width:30px;height:30px;background:linear-gradient(180deg,var(--bleu),var(--bleu-deep));color:#fff;border-radius:9px;font-family:var(--mono);font-size:13px;font-weight:600;display:flex;align-items:center;justify-content:center;font-variant-numeric:tabular-nums}
.sources .s-title{display:block;font-weight:700;color:var(--ink);font-size:16px;line-height:1.5;margin-bottom:12px}
.sources .s-pub{display:inline-block;font-family:var(--mono);font-size:10.5px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--bleu-deep);background:var(--slate-100);padding:4px 10px;border-radius:999px;margin-bottom:14px}
.sources a.s-url{display:block;font-size:13px;color:var(--slate-500);word-break:break-word;overflow-wrap:anywhere;font-weight:500;line-height:1.55;text-decoration:none}
.sources a.s-url:hover{color:var(--bleu-deep);text-decoration:underline}
.sources .s-date{display:block;font-family:var(--mono);font-size:11.5px;color:var(--slate-500);margin-top:14px;padding-top:14px;border-top:1px solid var(--line)}
@media (max-width:680px){.sources li{padding:56px 20px 20px}.sources li::before{top:18px;left:20px}}

/* CTA box */
.cta-box{background:linear-gradient(160deg,#0F172A,#0B1220);color:#fff;border-radius:var(--radius);padding:40px 42px;margin:48px 0;text-align:center;position:relative;overflow:hidden}
.cta-box::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 200px at 70% 0%,rgba(30,86,240,.35),transparent),radial-gradient(500px 200px at 20% 100%,rgba(236,30,121,.28),transparent)}
.cta-box>*{position:relative}
.cta-box h3{font-size:26px;margin-bottom:10px}
.cta-box p{color:var(--slate-300);font-size:16px;max-width:520px;margin:0 auto 22px}

/* Author box */
.author-box{display:flex;gap:18px;align-items:flex-start;border:1px solid var(--line);border-radius:var(--radius);padding:24px 26px;margin:40px 0;background:var(--slate-50)}
.author-box .avatar{width:56px;height:56px;border-radius:12px;background:linear-gradient(160deg,#0F172A,#0B1220);display:flex;align-items:center;justify-content:center;flex-shrink:0;padding:8px}
.author-box .avatar img{width:100%;height:auto;filter:drop-shadow(0 0 4px rgba(60,110,240,.4))}
.author-box h4{font-size:17px;margin-bottom:4px}
.author-box .role{font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--bleu-deep);margin-bottom:8px}
.author-box p{font-size:14.5px;color:var(--slate-600)}

/* TOC inline (mobile / écran étroit) */
.toc-inline{display:none;margin:28px 0 6px;border:1px solid var(--line);border-radius:12px;background:var(--slate-50);overflow:hidden}
.toc-inline summary{cursor:pointer;list-style:none;padding:15px 18px;font-family:var(--mono);font-size:12px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--bleu-deep);display:flex;justify-content:space-between;align-items:center}
.toc-inline summary::-webkit-details-marker{display:none}
.toc-inline summary::after{content:"–";font-size:20px;color:var(--slate-400)}
.toc-inline:not([open]) summary::after{content:"+"}
.toc-inline ol{list-style:none;padding:4px 10px 14px;margin:0;counter-reset:tocm}
.toc-inline li{counter-increment:tocm;margin:0}
.toc-inline a{display:block;padding:9px 12px;font-size:14.5px;color:var(--slate-700);border-radius:8px}
.toc-inline a::before{content:counter(tocm) ". ";color:var(--slate-400);font-variant-numeric:tabular-nums}
.toc-inline a:active,.toc-inline a:hover{background:#fff;color:var(--bleu-deep)}

/* TOC (sidebar) */
.toc{position:sticky;top:90px}
.toc .lbl{font-family:var(--mono);font-size:11.5px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--slate-500);display:block;margin-bottom:14px}
.toc ol{list-style:none;padding:0;margin:0;counter-reset:toc}
.toc li{counter-increment:toc;margin:0 0 4px}
.toc a{display:block;padding:8px 12px;font-size:14px;color:var(--slate-600);border-radius:8px;border-left:2px solid var(--line);transition:all .15s}
.toc a::before{content:counter(toc) ". ";color:var(--slate-400);font-variant-numeric:tabular-nums}
.toc a:hover{background:var(--slate-50);color:var(--ink);border-left-color:var(--bleu)}
.toc a.active{color:var(--bleu-deep);border-left-color:var(--bleu);background:var(--slate-50);font-weight:600}

/* Related */
.related{padding:20px 0 90px}
.related h2{font-size:28px;margin-bottom:24px}
.related .grid{padding:0}

/* Footer */
footer{background:var(--ink-2);color:var(--slate-400);padding:64px 0 30px;margin-top:20px}
.foot-top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;padding-bottom:40px;border-bottom:1px solid rgba(255,255,255,.08)}
.foot-brand .brand{color:#fff;margin-bottom:6px}
.foot-baseline{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--slate-500);margin-bottom:14px}
.foot-brand p{font-size:14px;max-width:280px;color:var(--slate-400)}
.foot-col h5{color:#fff;font-size:14px;margin-bottom:14px;font-weight:700}
.foot-col a{display:block;font-size:14px;color:var(--slate-400);margin-bottom:9px;transition:color .15s}
.foot-col a:hover{color:#fff}
.foot-bottom{display:flex;justify-content:space-between;align-items:center;padding-top:24px;flex-wrap:wrap;gap:14px}
.foot-bottom .links{display:flex;gap:20px}
.foot-bottom a{font-size:13px;color:var(--slate-500)}
.foot-bottom a:hover{color:#fff}
.foot-bottom .dom{font-size:13px;color:var(--slate-500)}

/* Responsive */
/* la colonne de droite (sommaire) est conservée le plus longtemps possible ;
   le repli en haut ne s'active que sur petit écran / téléphone */
@media (max-width:820px){
  .article-layout{grid-template-columns:1fr;gap:0}
  .toc{display:none}
  .toc-inline{display:block}
}
@media (max-width:960px){
  .grid{grid-template-columns:repeat(2,1fr)}
  .foot-top{grid-template-columns:1fr 1fr}
}
@media (max-width:680px){
  .grid{grid-template-columns:1fr}
  .nav-links{position:fixed;inset:70px 0 auto 0;background:#fff;flex-direction:column;align-items:flex-start;gap:0;padding:10px 24px 24px;border-bottom:1px solid var(--line);transform:translateY(-140%);transition:transform .25s ease;box-shadow:var(--shadow-md)}
  .nav-links.open{transform:translateY(0)}
  .nav-links a.link{padding:14px 0;border-bottom:1px solid var(--slate-100);width:100%}
  .nav-links .nav-cta{padding-top:14px}
  .menu-btn{display:flex}
  .foot-top{grid-template-columns:1fr}
  .cta-box,.callout,.checklist{padding-left:20px;padding-right:20px}
}