/* Institut IA — système « Blueprint » (voir Systeme.dc.html) */
:root{
  --paper:#EDF2F6; --card:#F6F9FB; --ink:#0F2C47; --brand:#1F598E;
  --text-2:#48627A; --text-3:#52708A; --line:#C3D2DE; --cote:#9DB4C8;
  --dark:#0F2C47; --dark-2:#0B2238; --dark-card:#133655; --dark-line:#2C4C6B; --dark-cote:#3B5F80;
  --on-dark:#DCE8F2; --on-dark-2:#96B2CB; --on-dark-3:#7F9DB8; --accent-dark:#6FA8D6;
  --sans:'Archivo',ui-sans-serif,system-ui,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,monospace;
  --gutter:64px; --max:1152px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,p{margin:0}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px}
.dark :focus-visible{outline-color:var(--accent-dark)}
.skip{position:absolute;left:-9999px;top:8px;background:var(--brand);color:#fff;padding:10px 16px;z-index:10}
.skip:focus{left:8px}

.wrap{max-width:calc(var(--max) + 2*var(--gutter));margin:0 auto;padding:0 var(--gutter)}
.mono{font-family:var(--mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;line-height:1.5}
.lead{font-size:17px;line-height:1.75;color:var(--text-2)}
.muted{color:var(--text-3)}
.h1{font-size:clamp(40px,6.2vw,76px);font-weight:700;letter-spacing:-.042em;line-height:1.02}
.h2{font-size:clamp(32px,4vw,48px);font-weight:700;letter-spacing:-.035em;line-height:1.08}
.h3{font-size:clamp(26px,3vw,36px);font-weight:700;letter-spacing:-.03em;line-height:1.15}
.accent{color:var(--brand)}

/* Boutons — plein = rejoindre Skool uniquement ; contour = le reste ; ≥ 44 px */
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 24px;font-family:var(--mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;border:1px solid var(--brand);transition:background .15s,color .15s}
.btn-primary{background:var(--brand);color:var(--paper)}
.btn-primary:hover{background:var(--ink);border-color:var(--ink)}
.btn-outline{color:var(--brand)}
.btn-outline:hover{background:var(--brand);color:var(--paper)}
.link{font-family:var(--mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--brand);display:inline-flex;align-items:center;min-height:44px}
.link:hover{text-decoration:underline;text-underline-offset:4px}
.actions{display:flex;flex-wrap:wrap;align-items:center;gap:14px 20px}

/* Nav */
.nav{border-bottom:1px solid var(--brand)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:94px}
.brand{font-weight:700;font-size:15px;letter-spacing:.05em;display:inline-flex;align-items:center;min-height:44px}
.nav-links{display:flex;gap:28px}
.nav-links a{color:var(--text-3)}
.nav-links a:hover,.nav-links a[aria-current]{color:var(--brand)}
.nav-cta{display:flex;align-items:center;gap:22px}
.nav-menu{display:none}
.nav-menu summary{list-style:none;cursor:pointer;min-height:44px;display:flex;align-items:center}
.nav-menu summary::-webkit-details-marker{display:none}
.nav-menu[open] .menu-panel{display:flex}
.menu-panel{display:none;flex-direction:column;position:absolute;left:0;right:0;top:94px;background:var(--paper);border-bottom:1px solid var(--brand);padding:8px var(--gutter) 20px;z-index:5}
.menu-panel a{padding:12px 0;border-bottom:1px solid var(--line)}

/* Ligne de cote */
.cote{display:flex;align-items:center;gap:10px;padding-top:30px}
.cote .t{width:1px;height:7px;background:var(--cote)}
.cote .l{flex:1;height:1px;background:var(--cote)}
.cote .mono{color:var(--text-3);text-align:center}

/* Sections */
section{scroll-margin-top:24px}
.sec{padding-bottom:96px}
.sec-head{display:flex;align-items:baseline;gap:20px;border-bottom:1px solid var(--brand);padding-bottom:14px;flex-wrap:wrap}
.sec-head .mono:last-child{margin-left:auto;color:var(--text-3)}
.split{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:64px;margin-top:44px;align-items:start}
.aside{border-left:1px solid var(--line);padding-left:28px}
.dash{display:flex;gap:12px}
.dash::before{content:"—";color:var(--brand);flex-shrink:0}

/* Hero */
.hero{padding:78px 0 40px}
.hero .sub{display:flex;gap:18px;margin-top:34px}
.hero .sub::before{content:"";width:46px;height:1px;background:var(--brand);margin-top:13px;flex-shrink:0}
.hero .actions{margin-top:40px;padding-left:64px}

/* Routes */
.routes{margin-top:24px}
.route{display:flex;align-items:center;gap:26px;padding:26px 0;border-top:1px solid var(--line);transition:border-color .15s}
.route:last-child{border-bottom:1px solid var(--brand)}
.route .num{color:var(--brand);width:42px;flex-shrink:0}
.route .txt{font-size:clamp(20px,2.3vw,27px);font-weight:500;letter-spacing:-.022em;flex:1}
.route .rule{width:90px;height:1px;background:var(--line);flex-shrink:0;transition:background .15s,width .15s}
.route .to{color:var(--brand);width:190px;flex-shrink:0}
.route:hover .rule{background:var(--brand);width:110px}
.route:hover{border-top-color:var(--brand)}
.stats{display:flex;flex-wrap:wrap;gap:20px 44px;margin-top:44px}
.stat{display:flex;align-items:baseline;gap:11px}
.stat b{font-size:30px;letter-spacing:-.035em}

/* Logos clients */
.logos{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line);margin-top:22px}
.logos li{list-style:none;background:var(--paper);min-height:62px;display:flex;align-items:center;justify-content:center;text-align:center;padding:8px;color:var(--text-3)}

/* Cartes */
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.card{border:1px solid var(--line);background:var(--card);padding:24px;display:flex;flex-direction:column}
.card.hl{border-color:var(--brand)}
.card h3{font-size:21px;letter-spacing:-.025em;margin-top:8px}
.card p{font-size:14px;line-height:1.55;color:var(--text-2);margin-top:10px;flex:1}
.price{display:flex;align-items:baseline;gap:6px;margin-top:20px}
.price b{font-size:30px;letter-spacing:-.035em}
.card .btn{margin-top:14px}
.more{border:1px dashed var(--cote);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:12px;padding:24px}
.diamond{width:12px;height:12px;border:1.5px solid var(--brand);transform:rotate(45deg)}

/* Méthode en phases (.phase-line) */
.phases{display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}
.phase .track{display:flex;align-items:center}
.phase .mk{width:12px;height:12px;border:1.5px solid var(--brand);background:var(--paper);transform:rotate(45deg);flex-shrink:0}
.phase.key .mk{background:var(--brand)}
.phase .ln{flex:1;height:1px;background:var(--brand)}
.phase:last-child .track::after{content:"";width:1px;height:12px;background:var(--brand)}
.phase .body{padding:22px 28px 0 0;display:flex;flex-direction:column;height:calc(100% - 12px)}
.phase h3{font-size:24px;letter-spacing:-.028em;margin-top:10px}
.phase .sub{font-size:14px;font-weight:600;color:var(--text-2);margin-top:4px}
.phase p{font-size:14px;line-height:1.6;color:var(--text-2);margin-top:14px;flex:1}
.phase .end{border-top:1px solid var(--line);margin-top:20px;padding-top:12px}
.phase .end b{display:block;font-size:15px;margin-top:6px}
.phase.key .end b{color:var(--brand)}
.quote-price{border-left:1px solid var(--line);padding-left:28px}

/* Conférences */
.facts{margin-top:22px}
.facts div{display:flex;justify-content:space-between;gap:16px;padding:9px 0;border-top:1px solid var(--line);font-size:14px}

/* Vidéo en façade : l'iframe n'est injectée qu'au clic */
.video{position:relative;aspect-ratio:16/9;border:1px solid var(--accent-dark);background:var(--dark-card);overflow:hidden;cursor:pointer;padding:0;width:100%;display:block}
.video img{width:100%;height:100%;object-fit:cover;opacity:.55}
.video .play{position:absolute;inset:0;display:flex;align-items:center;justify-content:center}
.video .src{position:absolute;left:12px;top:12px;color:var(--on-dark)}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

/* Bandes sombres */
.dark{background:var(--dark);color:var(--on-dark)}
.dark .lead{color:var(--on-dark-2)}
.dark .muted{color:var(--on-dark-3)}
.dark .accent,.dark .link{color:var(--accent-dark)}
.dark .btn-outline{border-color:var(--accent-dark);color:var(--on-dark)}
.dark .btn-outline:hover{background:var(--accent-dark);color:var(--dark)}
.dark .btn-primary{background:var(--accent-dark);border-color:var(--accent-dark);color:var(--dark)}
.dark .btn-primary:hover{background:var(--on-dark);border-color:var(--on-dark)}
.band{padding:110px 0;text-align:center}
.band .h2{max-width:800px;margin:0 auto}

/* Contact + footer */
.contact{border-top:1px solid var(--brand);padding-top:60px;display:grid;grid-template-columns:minmax(0,1fr) 380px;gap:60px}
.footer{background:var(--dark-2);color:var(--on-dark-2);padding:56px 0 40px;font-size:13px}
.footer .cols{display:flex;justify-content:space-between;gap:48px;flex-wrap:wrap}
.footer .links{display:flex;gap:56px;flex-wrap:wrap}
.footer .links div{display:flex;flex-direction:column;gap:8px}
.footer a:hover{color:var(--on-dark)}
.footer .base{display:flex;align-items:center;gap:10px;margin-top:44px;color:var(--on-dark-3)}
.footer .base .l{flex:1;height:1px;background:var(--dark-line)}

/* Responsive */
@media (max-width:1024px){
  :root{--gutter:40px}
  .nav-links{display:none}
  .nav-menu{display:block}
  .split,.contact{grid-template-columns:1fr;gap:36px}
  .aside,.quote-price{border-left:0;padding-left:0;border-top:1px solid var(--line);padding-top:24px}
  .grid-4,.phases{grid-template-columns:repeat(2,minmax(0,1fr));row-gap:40px}
  .logos{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:720px){
  :root{--gutter:22px}
  .nav .wrap{min-height:76px}
  .menu-panel{top:76px}
  .nav-cta .link{display:none}
  .grid-3,.grid-2,.grid-4,.phases{grid-template-columns:1fr}
  .hero .actions{padding-left:0}
  .hero .sub::before{display:none}
  .route{flex-wrap:wrap;gap:6px 16px}
  .route .rule{display:none}
  .route .txt{flex-basis:100%;order:2}
  .route .to{width:auto;order:3}
  .logos{grid-template-columns:repeat(2,minmax(0,1fr))}
  .sec{padding-bottom:72px}
  .band{padding:80px 0}
  .sec-head .mono:last-child{margin-left:0;flex-basis:100%}
}

/* Page entière en cyanotype (Zoran) */
body.dark{background:var(--dark)}
body.dark .nav{border-bottom-color:var(--accent-dark)}
body.dark .brand{color:var(--on-dark)}
body.dark .nav-links a{color:var(--on-dark-2)}
body.dark .nav-links a:hover,body.dark .nav-links a[aria-current]{color:var(--on-dark);text-decoration:underline;text-decoration-color:var(--accent-dark);text-underline-offset:6px}
body.dark .menu-panel{background:var(--dark);border-bottom-color:var(--accent-dark)}
body.dark .menu-panel a{border-bottom-color:var(--dark-line)}
body.dark .cote .t,body.dark .cote .l{background:var(--dark-cote)}
body.dark .cote .mono{color:var(--on-dark-3)}
.dark .rule-top{border-top:1px solid var(--dark-line);padding-top:60px}
.row-label{display:grid;grid-template-columns:180px minmax(0,1fr);gap:64px}
.row-label > .mono{padding-top:10px;color:var(--accent-dark)}
.prob{border-top:1px solid var(--accent-dark);padding-top:16px}
.prob b{display:block;font-size:20px;letter-spacing:-.02em}
.prob span{display:block;font-size:15px;color:var(--on-dark-2);margin-top:8px;line-height:1.55}
.dcard{background:var(--dark-card);border:1px solid var(--dark-line);padding:26px}
.dcard b{display:block;font-size:22px;letter-spacing:-.025em;line-height:1.2;margin-top:12px}
.dcard span.t{display:block;font-size:15px;color:var(--on-dark-2);margin-top:14px;line-height:1.6}
.big-num{font-size:clamp(120px,18vw,220px);font-weight:700;letter-spacing:-.06em;line-height:.85;color:var(--accent-dark);flex-shrink:0}
.door{border:1px solid var(--accent-dark);padding:76px 40px;text-align:center;display:flex;flex-direction:column;align-items:center}
.offer{display:flex;align-items:center;gap:22px;flex-wrap:wrap;justify-content:center;border-top:1px solid var(--dark-line);margin-top:36px;padding-top:28px}
@media (max-width:1024px){.row-label{grid-template-columns:1fr;gap:18px}}
@media (max-width:720px){.door{padding:56px 22px}}
@media (max-width:1024px){.tv{grid-template-columns:1fr!important;gap:28px!important}}
.footer .links a{display:inline-flex;align-items:center;min-height:32px}
.footer .links div{gap:2px}
.brand{white-space:nowrap}
body.dark .menu-panel a[style]{color:var(--accent-dark)!important}
@media (max-width:720px){.nav-cta .btn{display:none}}
.brand{display:inline-flex;align-items:center;gap:11px}
.logo-mark{height:30px;width:auto}
body.dark .logo-mark{display:none}
@media (max-width:720px){.logo-mark{height:26px}}