/* ==========================================================================
   LEARN — hub, articles, mega-menu.  v1.0.0 (05/09/2026)
   Source unique du style editorial. Genere par tools/build_learn.py.
   Tokens : indigo #667eea, purple #764ba2, bleu #007aff, encre #1c1c1e.
   ========================================================================== */
:root{
  --ln-ink:#1c1c1e; --ln-ink-2:#374151; --ln-ink-3:#4b5563; --ln-mute:#6b7280; --ln-faint:#8b93a1;
  --ln-line:#e5e7eb; --ln-line-2:#eef0f4; --ln-surface:#fff; --ln-surface-2:#f8fafc;
  --ln-blue:#007aff; --ln-indigo:#667eea; --ln-purple:#764ba2;
  --ln-radius:18px; --ln-radius-lg:28px;
  --ln-shadow:0 4px 40px rgba(0,0,0,.06); --ln-shadow-2:0 8px 28px rgba(15,23,42,.08);
  --ln-font:'Inter',-apple-system,BlinkMacSystemFont,'SF Pro Text',system-ui,sans-serif;
}
html.learn-page, html.learn-page body{height:auto!important;overflow:visible!important}
.learn-page body{margin:0;font-family:var(--ln-font);color:var(--ln-ink);background:linear-gradient(125deg,#fef7f0 0,#fffbf7 50%,#f9f4ef 100%);-webkit-font-smoothing:antialiased}
.learn-page body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(650px 650px at 18% 25%,rgba(255,159,28,.12),transparent 58%),radial-gradient(850px 850px at 82% 15%,rgba(14,165,233,.16),transparent 62%),radial-gradient(720px 720px at 35% 85%,rgba(168,85,247,.13),transparent 60%)}
.learn-main{padding:calc(var(--header-height,70px) + 28px) 20px 80px;max-width:1160px;margin:0 auto}
.ln-wrap{max-width:1120px;margin:0 auto}
a{color:var(--ln-blue)}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}

/* ---- primitives ---- */
.ln-badge{display:inline-flex;align-items:center;padding:3px 10px;border-radius:999px;font-size:11px;font-weight:700;letter-spacing:.6px;text-transform:uppercase;line-height:1.6}
.ln-badge.s-start{background:#e8f1ff;color:#0f5fd0}.ln-badge.s-techniques{background:#fff1e0;color:#b45309}.ln-badge.s-levels{background:#e9f8ee;color:#1a7f47}.ln-badge.s-understand{background:#eef0ff;color:#5b3fb8}
.ln-lv{display:inline-flex;gap:4px;align-items:center}.ln-lv i{width:9px;height:9px;border-radius:2.5px;background:var(--ln-line);display:inline-block}.ln-lv i.f{background:#5BD87A}
.ln-dot{display:inline-block;width:10px;height:10px;border-radius:50%;flex-shrink:0}
.ln-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px 14px;font-size:13px;color:var(--ln-faint);font-weight:600}
.ln-meta .sep{width:3px;height:3px;border-radius:50%;background:#c7ccd6}
.ln-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:46px;padding:0 22px;border-radius:12px;font-weight:700;font-size:15px;text-decoration:none;transition:transform .15s ease,box-shadow .15s ease,background .15s ease;white-space:nowrap}
.ln-btn.primary{background:var(--ln-blue);color:#fff;box-shadow:0 6px 18px rgba(0,122,255,.28)}
.ln-btn.primary:hover{transform:translateY(-1px);box-shadow:0 10px 24px rgba(0,122,255,.34)}
.ln-btn.ghost{background:#fff;color:var(--ln-ink-2);border:1.5px solid #d1d5db}
.ln-btn.ghost:hover{border-color:#9ca3af;background:#f9fafb}

/* ---- HUB ---- */
.hub-hero{background:var(--ln-surface);border-radius:var(--ln-radius-lg);box-shadow:var(--ln-shadow);padding:44px 48px 36px;display:grid;grid-template-columns:1.25fr 1fr;gap:40px;align-items:center}
.hub-hero h1{margin:0 0 10px;font-size:clamp(30px,3.4vw,40px);font-weight:800;letter-spacing:-.5px;line-height:1.1;background:linear-gradient(135deg,var(--ln-indigo),var(--ln-purple));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hub-hero p{margin:0 0 20px;font-size:17px;line-height:1.6;color:var(--ln-ink-3);max-width:52ch}
.hub-pills{display:flex;gap:8px;flex-wrap:wrap;position:sticky;top:calc(var(--header-height,70px) + 8px);z-index:5}
.hub-pill{padding:8px 14px;border-radius:999px;border:1.5px solid #d1d5db;font-size:14px;font-weight:600;color:var(--ln-ink-2);background:#fff;text-decoration:none;transition:background .15s,border-color .15s,color .15s}
.hub-pill:hover{border-color:#9ca3af;background:#f9fafb}.hub-pill.on,.hub-pill:focus-visible{background:var(--ln-blue);border-color:var(--ln-blue);color:#fff;outline:0}
.hub-start{background:var(--ln-surface-2);border:1px solid var(--ln-line);border-radius:var(--ln-radius);padding:18px 20px}
.hub-start h2{margin:0 0 10px;font-size:12px;letter-spacing:2px;color:var(--ln-faint);text-transform:uppercase;font-weight:700}
.hub-step{display:flex;gap:12px;align-items:center;padding:10px 0;border-top:1px solid var(--ln-line-2);font-size:15px;font-weight:600;color:var(--ln-ink);text-decoration:none}
.hub-step:first-of-type{border-top:0}.hub-step:hover{color:var(--ln-blue)}
.hub-step .n{width:26px;height:26px;border-radius:50%;background:linear-gradient(135deg,var(--ln-indigo),var(--ln-purple));color:#fff;font-size:13px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.hub-step em{font-style:normal;color:var(--ln-faint);font-weight:500;font-size:13px;margin-left:auto;white-space:nowrap}
.hub-sec{margin-top:46px;scroll-margin-top:calc(var(--header-height,70px) + 70px)}
.hub-sec-h{display:flex;align-items:baseline;gap:14px;margin:0 0 16px}
.hub-sec-h h2{margin:0;font-size:24px;font-weight:800;color:var(--ln-ink);display:flex;align-items:center;gap:10px}
.hub-sec-h h2 i{width:12px;height:12px;border-radius:4px;display:inline-block}
.hub-sec-h span{font-size:14px;color:var(--ln-mute)}
.hub-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.hub-card{background:var(--ln-surface);border:1px solid var(--ln-line);border-radius:var(--ln-radius);padding:18px 18px 16px;display:flex;flex-direction:column;gap:10px;min-height:172px;text-decoration:none;color:inherit;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
.hub-card:hover{transform:translateY(-3px);box-shadow:var(--ln-shadow-2);border-color:#d1d5db}
.hub-card .top{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--ln-faint);font-weight:600}
.hub-card h3{margin:0;font-size:16.5px;line-height:1.35;font-weight:700;color:var(--ln-ink)}
.hub-card p{margin:0;font-size:13.5px;line-height:1.5;color:var(--ln-mute);flex:1;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.hub-card .foot{display:flex;justify-content:space-between;align-items:center;font-size:12.5px;color:var(--ln-faint);font-weight:600}
.hub-card .foot b{color:var(--ln-blue)}
.hub-card.static{background:var(--ln-surface-2)}
.hub-card.static .icon{width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:18px}

/* ---- ARTICLE ---- */
.art-head{max-width:820px;margin:0 auto 26px}
.art-crumb{display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-size:13px;color:var(--ln-faint);font-weight:600;margin:0 0 18px;padding:0;list-style:none}
.art-crumb a{color:var(--ln-mute);text-decoration:none}.art-crumb a:hover{color:var(--ln-blue)}
.art-crumb li+li::before{content:"›";margin-right:6px;color:#c7ccd6}
.art-eyebrow{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.art-head h1{margin:0 0 14px;font-size:clamp(30px,3.6vw,42px);line-height:1.12;font-weight:800;letter-spacing:-.6px;color:var(--ln-ink)}
.art-lede{margin:0 0 18px;font-size:19px;line-height:1.55;color:var(--ln-ink-3)}
.art-byline{display:flex;align-items:center;gap:12px;font-size:13.5px;color:var(--ln-mute);padding-top:16px;border-top:1px solid var(--ln-line)}
.art-byline .av{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--ln-indigo),var(--ln-purple));color:#fff;font-weight:800;font-size:13px;display:flex;align-items:center;justify-content:center}
.art-byline b{color:var(--ln-ink);font-weight:700}
.art-layout{display:grid;grid-template-columns:232px minmax(0,780px);gap:44px;justify-content:center;align-items:start}
.art-aside{position:sticky;top:calc(var(--header-height,70px) + 24px)}
.art-toc{background:var(--ln-surface);border:1px solid var(--ln-line);border-radius:16px;padding:16px 16px 12px}
.art-toc h2{margin:0 0 8px;font-size:11px;letter-spacing:2px;text-transform:uppercase;color:var(--ln-faint);font-weight:700}
.art-toc ol{list-style:none;margin:0;padding:0}
.art-toc li a{display:block;padding:7px 10px;margin:0 -6px;border-radius:8px;font-size:13.5px;line-height:1.35;color:var(--ln-ink-2);text-decoration:none;border-left:2px solid transparent}
.art-toc li a:hover{background:rgba(0,122,255,.06);color:var(--ln-blue)}
.art-toc li a.on{color:var(--ln-blue);border-left-color:var(--ln-blue);background:rgba(0,122,255,.06);font-weight:600}
.art-aside .mini-cta{margin-top:14px;background:linear-gradient(135deg,var(--ln-indigo),var(--ln-purple));color:#fff;border-radius:16px;padding:16px;font-size:13.5px;line-height:1.45}
.art-aside .mini-cta b{display:block;font-size:14px;margin-bottom:4px}
.art-aside .mini-cta a{display:inline-flex;margin-top:10px;background:#fff;color:var(--ln-purple);font-weight:700;border-radius:9px;padding:8px 12px;text-decoration:none;font-size:13px}
.art-body{background:var(--ln-surface);border-radius:var(--ln-radius-lg);box-shadow:var(--ln-shadow);padding:40px 48px 44px;font-size:17px;line-height:1.75;color:var(--ln-ink-2);overflow-wrap:anywhere}
.art-body>*:first-child{margin-top:0}
.art-body p{margin:0 0 18px}
.art-body .article-intro{font-size:18.5px;color:var(--ln-ink-3)}
.art-body h2{margin:44px 0 14px;font-size:26px;line-height:1.25;font-weight:800;color:var(--ln-ink);letter-spacing:-.3px;display:flex;align-items:center;gap:10px;scroll-margin-top:calc(var(--header-height,70px) + 20px)}
.art-body h2 img,.art-body h3 img{width:24px;height:24px;flex-shrink:0}
.art-body h3{margin:28px 0 10px;font-size:20px;font-weight:700;color:var(--ln-ink);display:flex;align-items:center;gap:8px}
.art-body h4{margin:20px 0 8px;font-size:17px;font-weight:700}
.art-body a{color:var(--ln-blue);text-decoration:underline;text-decoration-color:rgba(0,122,255,.35);text-underline-offset:3px}
.art-body a:hover{text-decoration-color:var(--ln-blue)}
.art-body strong{color:var(--ln-ink);font-weight:700}
.art-body ul,.art-body ol{margin:0 0 18px;padding-left:24px}.art-body li{margin:6px 0}
.art-body img{max-width:100%;height:auto}
.art-body img.hero-img{display:block;width:100%;border-radius:16px;margin:8px 0 26px;box-shadow:0 10px 30px rgba(15,23,42,.10)}
.art-body figure{margin:22px 0;padding:0}
.art-body figure img{display:block;width:100%;border-radius:14px;border:1px solid var(--ln-line)}
.art-body figcaption{margin-top:8px;font-size:13.5px;color:var(--ln-mute);text-align:center}
.art-body video{width:100%;border-radius:14px;display:block;margin:16px 0}
.art-body blockquote{margin:24px 0;padding:6px 0 6px 20px;border-left:3px solid var(--ln-indigo);color:var(--ln-ink-3);font-size:18px;font-style:italic}
.art-body code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9em;background:#f3f4f6;padding:2px 6px;border-radius:6px;color:#111827}
.art-body pre{background:#0f172a;color:#e5e7eb;padding:18px 20px;border-radius:14px;overflow:auto;font-size:14px;line-height:1.55}
.art-body pre code{background:transparent;color:inherit;padding:0}
.art-body table{width:100%;border-collapse:separate;border-spacing:0;margin:22px 0;font-size:15px;border:1px solid var(--ln-line);border-radius:14px;overflow:hidden}
.art-body th{background:var(--ln-surface-2);text-align:left;font-weight:700;color:var(--ln-ink);padding:11px 14px;border-bottom:1px solid var(--ln-line);font-size:13px;letter-spacing:.3px;text-transform:uppercase}
.art-body td{padding:11px 14px;border-bottom:1px solid var(--ln-line-2);vertical-align:top}
.art-body tr:last-child td{border-bottom:0}
.art-body .highlight-box,.art-body .key-point-box,.art-body .why-it-works,.art-body .quick-recap,.art-body .key-takeaways,.art-body .nav-hint{margin:24px 0;padding:18px 22px;border-radius:14px;background:#f5f7fb;border:1px solid #e3e8f2}
.art-body .highlight-box{display:flex;gap:14px;align-items:flex-start}
.art-body .highlight-box>img{width:28px;height:28px;flex-shrink:0;margin-top:2px}
.art-body .highlight-box p,.art-body .key-point-box p,.art-body .why-it-works p,.art-body .quick-recap p{margin:0}
.art-body .highlight-box.tip{background:#fff8e6;border-color:#f6e2b3}
.art-body .highlight-box.warning{background:#fff1f0;border-color:#f5c6c2}
.art-body .highlight-box.success{background:#eefaf1;border-color:#bfe8cb}
.art-body .why-it-works{background:#eef4ff;border-color:#cfe0ff}
.art-body .why-it-works h3,.art-body .key-takeaways-title,.art-body .quick-recap h3{margin:0 0 8px;font-size:15px;letter-spacing:.4px;text-transform:uppercase;color:#4b5f8a}
.art-body .key-takeaways{background:linear-gradient(135deg,#eef2ff,#f5f3ff);border-color:#dfe3ff}
.art-body .key-takeaways ul{margin:0;padding-left:20px}
.art-body .key-point{display:flex;gap:12px;align-items:flex-start;margin:10px 0}
.art-body .rule-number,.art-body .reason-number,.art-body .phase-badge{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:50%;background:linear-gradient(135deg,var(--ln-indigo),var(--ln-purple));color:#fff;font-weight:800;font-size:14px;flex-shrink:0}
.art-body .reason-card,.art-body .phase-card{display:flex;gap:16px;margin:16px 0;padding:18px 20px;border:1px solid var(--ln-line);border-radius:14px;background:#fff}
.art-body .phase-card{flex-direction:column;gap:8px}
.art-body .phase-header{display:flex;align-items:center;gap:12px}.art-body .phase-title{font-weight:700;font-size:17px;color:var(--ln-ink);margin:0}
.art-body .reason-content h3{margin:0 0 6px}.art-body .reason-content p{margin:0}
.art-body .faq-section{margin-top:36px}
.art-body .faq-item{border:1px solid var(--ln-line);border-radius:12px;padding:14px 18px;margin:10px 0;background:#fff}
.art-body .faq-question{font-weight:700;color:var(--ln-ink);margin:0 0 6px;display:flex;gap:8px;align-items:flex-start}
.art-body .faq-answer{margin:0;color:var(--ln-ink-3);font-size:15.5px}
.art-body .q-icon{color:var(--ln-blue)}
.art-body .keyword{color:var(--ln-purple);font-weight:600}.art-body .function{color:#0f5fd0;font-weight:600}
.art-body .data-table,.art-body .comparison-table{font-size:14.5px}
.art-body .stat-item{display:inline-flex;flex-direction:column;align-items:center;padding:14px 18px;margin:6px;border-radius:14px;background:var(--ln-surface-2);border:1px solid var(--ln-line);min-width:130px}
.art-body .stat-value{font-size:26px;font-weight:800;color:var(--ln-ink);font-variant-numeric:tabular-nums}.art-body .stat-label{font-size:12px;color:var(--ln-mute);text-transform:uppercase;letter-spacing:.5px;margin-top:2px}
.art-body .icon,.art-body .icon-grille,.art-body .icon-trophe,.art-body .icon-diamant{width:22px;height:22px;vertical-align:middle}
.art-body .article-tag{display:inline-block;padding:2px 8px;border-radius:999px;background:#eef0ff;color:#5b3fb8;font-size:12px;font-weight:700;margin-right:6px}
.art-body .practice-cta,.art-body .capsule-cta-btn{display:inline-flex;align-items:center;gap:8px;background:var(--ln-blue);color:#fff!important;text-decoration:none!important;font-weight:700;border-radius:12px;padding:12px 20px}
.art-body time{color:var(--ln-mute)}

/* mise en pratique */
.art-practice{margin:36px 0 0;border-radius:var(--ln-radius-lg);padding:32px 36px;background:linear-gradient(135deg,var(--ln-indigo),var(--ln-purple));color:#fff;display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center;box-shadow:0 16px 40px rgba(102,126,234,.28)}
.art-practice h2{margin:0 0 8px;font-size:24px;font-weight:800;letter-spacing:-.3px}
.art-practice p{margin:0;font-size:15.5px;line-height:1.55;opacity:.92;max-width:56ch}
.art-practice .ln-btn{background:#fff;color:var(--ln-purple);box-shadow:0 8px 20px rgba(0,0,0,.18);height:50px;padding:0 26px;font-size:16px}
.art-practice .ln-btn:hover{transform:translateY(-1px)}
/* suite */
.art-next{margin-top:26px;display:grid;grid-template-columns:1fr 1fr;gap:14px}
.art-next a{display:flex;flex-direction:column;gap:6px;padding:16px 18px;border:1px solid var(--ln-line);border-radius:16px;background:#fff;text-decoration:none;color:var(--ln-ink);transition:border-color .15s,box-shadow .15s,transform .15s}
.art-next a:hover{border-color:#d1d5db;box-shadow:var(--ln-shadow-2);transform:translateY(-2px)}
.art-next a span{font-size:12px;letter-spacing:1.5px;text-transform:uppercase;color:var(--ln-faint);font-weight:700}
.art-next a b{font-size:15.5px;font-weight:700;line-height:1.35}
.art-next a.next{text-align:right;align-items:flex-end}
.art-related{margin-top:40px}
.art-related h2{margin:0 0 14px;font-size:20px;font-weight:800;color:var(--ln-ink)}
.art-related .hub-grid{gap:14px}
.art-back{margin-top:28px;font-size:14px;font-weight:600}
.art-back a{text-decoration:none;color:var(--ln-mute)}.art-back a:hover{color:var(--ln-blue)}

/* ---- responsive ---- */
@media(max-width:1100px){.art-layout{grid-template-columns:minmax(0,1fr)}.art-aside{position:static;order:2}.art-toc{display:none}.hub-grid{grid-template-columns:repeat(2,1fr)}.hub-hero{grid-template-columns:1fr}}
@media(max-width:768px){.learn-main{padding:calc(var(--header-height,0px) + 16px) 14px 60px}.hub-hero{padding:28px 22px;border-radius:22px}.hub-grid{grid-template-columns:1fr}.art-body{padding:26px 20px 30px;border-radius:22px;font-size:16.5px}.art-practice{grid-template-columns:1fr;padding:24px}.art-next{grid-template-columns:1fr}.hub-pills{position:static}}