/* ART IMPACT — Think Tank de la Responsabilité Culturelle des Entreprises
   Direction artistique : institutionnel premium sombre */

:root{
  --ink:#0A0E13;
  --ink-2:#0F141B;
  --ink-3:#151C25;
  --line:rgba(201,162,39,.18);
  --line-soft:rgba(255,255,255,.08);
  --text:#E8E6E1;
  --text-dim:#A3A8B0;
  --gold:#C9A227;
  --gold-soft:#E0C15E;
  --copper:#B4703C;
  --serif:"Cormorant Garamond",Georgia,"Times New Roman",serif;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  --wrap:1180px;
  --gut:24px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--ink);color:var(--text);
  font-family:var(--sans);font-size:17px;line-height:1.7;
  font-weight:350;letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
::selection{background:var(--gold);color:var(--ink)}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--gut)}
.narrow{max-width:820px}

/* ---------- Typographie ---------- */
h1,h2,h3,h4{font-family:var(--serif);font-weight:400;letter-spacing:-.01em;margin:0}
h1{font-size:clamp(2.6rem,6.4vw,4.6rem);line-height:1.04}
h2{font-size:clamp(2rem,4vw,3.1rem);line-height:1.12}
h3{font-size:clamp(1.3rem,2.2vw,1.65rem);line-height:1.25}
p{margin:0 0 1.15em}
.lead{font-size:clamp(1.12rem,1.9vw,1.4rem);line-height:1.62;color:#D6D3CC;font-weight:300}
.dim{color:var(--text-dim)}
.serif-quote{font-family:var(--serif);font-size:clamp(1.5rem,3.2vw,2.35rem);line-height:1.35;color:#F2EFE8;font-weight:300}
strong{font-weight:600;color:#F5F2EC}

.eyebrow{
  font-size:.72rem;letter-spacing:.24em;text-transform:uppercase;
  color:var(--gold);font-weight:500;font-family:var(--sans);
  display:flex;align-items:center;gap:14px;margin-bottom:22px;
}
.eyebrow::after{content:"";flex:1;height:1px;background:var(--line);max-width:120px}
.eyebrow.solo::after{display:none}

.rule{height:1px;background:var(--line-soft);border:0;margin:0}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(10,14,19,.82);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line-soft);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:74px;gap:24px}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand-mark{
  width:auto;height:34px;flex-shrink:0;display:block;
  color:var(--gold);fill:currentColor;transition:color .3s;
}
.brand:hover .brand-mark{color:var(--gold-soft)}
.site-footer .brand-mark{height:38px}
.brand-name{font-family:var(--serif);font-size:1.32rem;letter-spacing:.02em;line-height:1}
.brand-sub{display:block;font-family:var(--sans);font-size:.58rem;letter-spacing:.2em;
  text-transform:uppercase;color:var(--text-dim);margin-top:3px}
.nav-links{display:flex;align-items:center;gap:26px;list-style:none;margin:0;padding:0}
.nav-links a{
  font-size:.83rem;color:var(--text-dim);letter-spacing:.02em;
  padding:6px 0;position:relative;transition:color .25s;white-space:nowrap;
}
.nav-links a:hover,.nav-links a[aria-current="page"]{color:var(--text)}
.nav-links a[aria-current="page"]::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--gold);
}
.nav-cta{
  border:1px solid var(--gold);color:var(--gold)!important;
  padding:9px 18px!important;border-radius:2px;font-size:.78rem;letter-spacing:.08em;
  text-transform:uppercase;transition:background .25s,color .25s;
}
.nav-cta:hover{background:var(--gold);color:var(--ink)!important}
.burger{display:none;background:none;border:0;color:var(--text);padding:10px;cursor:pointer}
.burger span{display:block;width:22px;height:1.5px;background:currentColor;margin:5px 0;transition:.3s}
.nav-open .burger span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.nav-open .burger span:nth-child(2){opacity:0}
.nav-open .burger span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

@media(max-width:1060px){
  .burger{display:block}
  .nav-links{
    position:fixed;inset:74px 0 auto;background:var(--ink-2);
    flex-direction:column;align-items:flex-start;gap:0;padding:14px var(--gut) 34px;
    border-bottom:1px solid var(--line-soft);
    transform:translateY(-120%);transition:transform .4s cubic-bezier(.16,1,.3,1);
    max-height:calc(100vh - 74px);overflow-y:auto;
  }
  .nav-open .nav-links{transform:translateY(0)}
  .nav-links li{width:100%;border-bottom:1px solid var(--line-soft)}
  .nav-links li:last-child{border:0;padding-top:18px}
  .nav-links a{display:block;padding:15px 0;font-size:.98rem}
  .nav-cta{display:inline-block}
}

/* ---------- Hero ---------- */
.hero{position:relative;padding:clamp(88px,15vh,170px) 0 clamp(72px,11vh,120px);overflow:hidden}
.hero::before{
  content:"";position:absolute;top:-30%;left:50%;transform:translateX(-50%);
  width:1100px;height:1100px;pointer-events:none;
  background:radial-gradient(circle,rgba(201,162,39,.10) 0%,rgba(180,112,60,.05) 38%,transparent 66%);
}
.hero::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:linear-gradient(var(--line-soft) 1px,transparent 1px);
  background-size:100% 96px;mask-image:linear-gradient(to bottom,transparent,#000 60%,transparent);
  -webkit-mask-image:linear-gradient(to bottom,transparent,#000 60%,transparent);
}
.hero .wrap{position:relative;z-index:2}
.hero h1{max-width:16ch}
.hero .lead{max-width:62ch;margin-top:30px}
.hero-meta{
  display:flex;flex-wrap:wrap;gap:12px 34px;margin-top:44px;
  font-size:.76rem;letter-spacing:.14em;text-transform:uppercase;color:var(--text-dim);
}
.hero-meta span{display:flex;align-items:center;gap:9px}
.hero-meta span::before{content:"";width:5px;height:5px;background:var(--gold);border-radius:50%}

.page-hero{padding:clamp(70px,11vh,120px) 0 clamp(48px,7vh,76px);border-bottom:1px solid var(--line-soft);position:relative;overflow:hidden}
.page-hero::before{
  content:"";position:absolute;top:-55%;right:-10%;width:760px;height:760px;pointer-events:none;
  background:radial-gradient(circle,rgba(201,162,39,.09),transparent 64%);
}
.page-hero .wrap{position:relative;z-index:2}
.page-hero h1{max-width:18ch}
.page-hero .lead{max-width:64ch;margin-top:26px}

/* ---------- Sections ---------- */
section{position:relative}
.sec{padding:clamp(66px,9.5vh,118px) 0}
.sec-alt{background:var(--ink-2);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.sec-head{max-width:760px;margin-bottom:54px}
.sec-head p:last-child{margin-bottom:0}

/* ---------- Boutons ---------- */
.btn-row{display:flex;flex-wrap:wrap;gap:14px;margin-top:38px}
.btn{
  display:inline-flex;align-items:center;gap:11px;
  padding:14px 28px;border-radius:2px;font-size:.8rem;letter-spacing:.11em;
  text-transform:uppercase;font-weight:500;transition:.28s;border:1px solid transparent;
  /* Neutralise le style natif des <button> : sans cela, un bouton sans
     background declare herite du gris systeme et devient illisible. */
  background:transparent;font-family:var(--sans);line-height:1;
  cursor:pointer;-webkit-appearance:none;appearance:none;
}
.btn:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
.btn-primary{background:var(--gold);color:var(--ink)}
.btn-primary:hover{background:var(--gold-soft)}
.btn-ghost{border-color:var(--line);color:var(--text);background:transparent}
.btn-ghost:hover{background:transparent}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold)}
.btn .arw{transition:transform .28s}
.btn:hover .arw{transform:translateX(4px)}

.link-more{
  display:inline-flex;align-items:center;gap:9px;color:var(--gold);
  font-size:.78rem;letter-spacing:.11em;text-transform:uppercase;font-weight:500;
  border-bottom:1px solid transparent;padding-bottom:3px;transition:border-color .25s;
}
.link-more:hover{border-color:var(--gold)}

/* ---------- Grilles ---------- */
.grid{display:grid;gap:1px;background:var(--line-soft);border:1px solid var(--line-soft)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.cell{background:var(--ink);padding:40px 34px;transition:background .35s;position:relative}
.sec-alt .cell{background:var(--ink-2)}
.cell:hover{background:var(--ink-3)}
.cell .num{
  font-family:var(--serif);font-size:.95rem;color:var(--gold);
  display:block;margin-bottom:18px;letter-spacing:.1em;
}
.cell h3{margin-bottom:14px}
.cell p{font-size:.95rem;color:var(--text-dim);margin-bottom:0}
.cell p + .link-more{margin-top:22px}

.cards{display:grid;gap:22px;grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.card{
  background:var(--ink-2);border:1px solid var(--line-soft);padding:34px 30px;
  border-radius:3px;transition:border-color .35s,transform .35s;
}
.sec-alt .card{background:var(--ink-3)}
.card:hover{border-color:var(--line);transform:translateY(-3px)}
.card h3{margin-bottom:12px}
.card p{font-size:.95rem;color:var(--text-dim);margin-bottom:0}

/* ---------- Liste éditoriale ---------- */
.ed-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line-soft)}
.ed-list li{
  border-bottom:1px solid var(--line-soft);padding:26px 0;
  display:grid;grid-template-columns:52px 1fr;gap:24px;align-items:start;
}
.ed-list .k{font-family:var(--serif);color:var(--gold);font-size:1.05rem;padding-top:2px}
.ed-list h3{margin-bottom:8px}
.ed-list p{font-size:.95rem;color:var(--text-dim);margin:0}

.bullets{list-style:none;margin:0;padding:0}
.bullets li{
  position:relative;padding-left:26px;margin-bottom:14px;
  font-size:.98rem;color:var(--text-dim);
}
.bullets li::before{
  content:"";position:absolute;left:0;top:11px;width:11px;height:1px;background:var(--gold);
}
.bullets strong{color:var(--text)}

/* ---------- Chiffres ---------- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:1px;background:var(--line-soft);
  border:1px solid var(--line-soft)}
.stat{background:var(--ink);padding:38px 30px}
.sec-alt .stat{background:var(--ink-2)}
.stat b{display:block;font-family:var(--serif);font-size:clamp(2.2rem,4.4vw,3.1rem);color:var(--gold-soft);
  font-weight:400;line-height:1;margin-bottom:12px}
.stat span{font-size:.85rem;color:var(--text-dim);letter-spacing:.02em}

/* ---------- Split ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(40px,6vw,86px);align-items:start}
.split-side{border-left:1px solid var(--line);padding-left:32px}
.split-side h3{margin-bottom:16px}

/* ---------- Citation ---------- */
.pull{
  border-left:2px solid var(--gold);padding:8px 0 8px 32px;margin:52px 0;max-width:780px;
}

/* ---------- CTA bande ---------- */
.cta-band{
  background:linear-gradient(135deg,var(--ink-3),var(--ink-2));
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  padding:clamp(58px,8vh,96px) 0;text-align:center;position:relative;overflow:hidden;
}
.cta-band::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(ellipse at 50% 120%,rgba(201,162,39,.14),transparent 62%);
}
.cta-band .wrap{position:relative;z-index:2}
.cta-band h2{max-width:20ch;margin:0 auto 20px}
.cta-band .lead{max-width:56ch;margin:0 auto}
.cta-band .btn-row{justify-content:center}

/* ---------- Formulaire ---------- */
.form{display:grid;gap:20px;max-width:680px}
.field{display:grid;gap:8px}
.field label{font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:var(--text-dim)}
.field input,.field select,.field textarea{
  background:var(--ink-2);border:1px solid var(--line-soft);color:var(--text);
  padding:14px 16px;font-family:var(--sans);font-size:.97rem;border-radius:2px;
  transition:border-color .25s;width:100%;
}
.field input:focus,.field select:focus,.field textarea:focus{outline:0;border-color:var(--gold)}
.field textarea{min-height:150px;resize:vertical}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.consent{display:flex;gap:12px;align-items:flex-start;font-size:.85rem;color:var(--text-dim)}
.consent input{width:16px;height:16px;margin-top:3px;accent-color:var(--gold);flex-shrink:0}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink-2);border-top:1px solid var(--line-soft);padding:70px 0 34px;font-size:.9rem}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:46px;margin-bottom:54px}
.foot-grid h4{font-family:var(--sans);font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--gold);margin-bottom:20px;font-weight:500}
.foot-grid ul{list-style:none;margin:0;padding:0}
.foot-grid li{margin-bottom:11px}
.foot-grid a{color:var(--text-dim);transition:color .25s}
.foot-grid a:hover{color:var(--text)}
.foot-brand p{color:var(--text-dim);font-size:.92rem;max-width:34ch;margin-top:18px}
.foot-bottom{
  border-top:1px solid var(--line-soft);padding-top:26px;
  display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;
  font-size:.8rem;color:var(--text-dim);
}
.foot-bottom nav{display:flex;flex-wrap:wrap;gap:22px}

/* ---------- Animation ---------- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .85s cubic-bezier(.16,1,.3,1),transform .85s cubic-bezier(.16,1,.3,1)}
.reveal.in{opacity:1;transform:none}

/* ---------- Responsive ---------- */
@media(max-width:980px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:1fr}
  .split{grid-template-columns:1fr}
  .split-side{border-left:0;border-top:1px solid var(--line);padding-left:0;padding-top:28px}
  .foot-grid{grid-template-columns:1fr 1fr;gap:38px}
}
@media(max-width:640px){
  body{font-size:16px}
  .grid-2,.grid-4{grid-template-columns:1fr}
  .cell{padding:32px 26px}
  .form-row{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .ed-list li{grid-template-columns:1fr;gap:8px}
  .pull{padding-left:22px;margin:38px 0}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}

/* ---------- Bloc logo d'ouverture (accueil) ---------- */
.logo-lockup{text-align:center;margin:0 auto clamp(48px,7vh,78px);max-width:640px}
.lockup-mark{
  height:clamp(72px,11vw,104px);width:auto;display:block;margin:0 auto 26px;
  color:var(--gold);fill:currentColor;
}
.lockup-name{
  font-family:var(--serif);font-weight:300;
  font-size:clamp(2.1rem,5vw,3.4rem);line-height:1;
  letter-spacing:.02em;color:#F5F2EC;margin:0 0 18px;
}
.lockup-base{
  font-size:clamp(.74rem,1.7vw,.92rem);letter-spacing:.06em;
  color:var(--text-dim);margin:0;line-height:1.7;
}
.logo-lockup + .eyebrow{justify-content:center}
.logo-lockup + .eyebrow::before,
.logo-lockup + .eyebrow::after{content:"";flex:1;height:1px;background:var(--line);max-width:90px}
@media(max-width:560px){
  .lockup-base{letter-spacing:.02em}
}

/* ---------- Questions frequentes ---------- */
.faq{border-top:1px solid var(--line-soft);max-width:900px}
.qa{border-bottom:1px solid var(--line-soft)}
.qa summary{
  list-style:none;cursor:pointer;padding:26px 44px 26px 0;position:relative;
  display:block;transition:color .25s;
}
.qa summary::-webkit-details-marker{display:none}
.qa summary h3{display:inline;font-size:clamp(1.12rem,2vw,1.4rem);color:var(--text)}
.qa summary:hover h3{color:var(--gold-soft)}
.qa summary::after{
  content:"";position:absolute;right:8px;top:50%;width:11px;height:11px;
  border-right:1.5px solid var(--gold);border-bottom:1.5px solid var(--gold);
  transform:translateY(-70%) rotate(45deg);transition:transform .3s;
}
.qa[open] summary::after{transform:translateY(-30%) rotate(-135deg)}
.qa > p{
  margin:0;padding:0 44px 30px 0;color:var(--text-dim);
  font-size:1rem;max-width:72ch;
}
.qa summary:focus-visible{outline:2px solid var(--gold);outline-offset:4px}

/* ---------- Article ---------- */
.article{padding-top:clamp(52px,8vh,86px)}
.article h1{font-size:clamp(2.1rem,4.6vw,3.4rem);margin-bottom:26px}
.art-meta{
  display:flex;flex-wrap:wrap;gap:10px 26px;margin:0;
  font-size:.76rem;letter-spacing:.14em;text-transform:uppercase;color:var(--text-dim);
}
.art-meta > *{display:flex;align-items:center;gap:9px}
.art-meta > *::before{content:"";width:5px;height:5px;background:var(--gold);border-radius:50%}
.card .art-meta{letter-spacing:.1em}

.prose{font-size:1.06rem;line-height:1.82;color:#D9D6D0}
.prose > *:first-child{margin-top:0}
.prose h2{
  font-size:clamp(1.5rem,2.8vw,2.05rem);margin:56px 0 20px;color:#F2EFE8;
  padding-top:22px;border-top:1px solid var(--line-soft);
}
.prose h3{font-size:clamp(1.18rem,2vw,1.42rem);margin:38px 0 14px;color:#F2EFE8}
.prose p{margin:0 0 1.35em}
.prose strong{color:#F5F2EC}
.prose em{color:var(--text-dim)}
.prose a{color:var(--gold);border-bottom:1px solid rgba(201,162,39,.35)}
.prose a:hover{border-color:var(--gold)}
.prose ul,.prose ol{margin:0 0 1.5em;padding-left:1.3em}
.prose li{margin-bottom:.6em;padding-left:.3em}
.prose li::marker{color:var(--gold)}
.prose blockquote{
  border-left:2px solid var(--gold);margin:38px 0;padding:6px 0 6px 28px;
  font-family:var(--serif);font-size:1.3rem;line-height:1.5;color:#F2EFE8;
}
.prose blockquote p{margin:0}
.prose hr{border:0;height:1px;background:var(--line-soft);margin:48px 0}
.prose code{
  background:var(--ink-3);padding:2px 7px;border-radius:2px;
  font-size:.9em;color:var(--gold-soft);
}
.prose img{border-radius:3px;margin:34px 0}

.tags{display:flex;flex-wrap:wrap;gap:9px;margin:46px 0 0}
.tags span{
  font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--text-dim);
  border:1px solid var(--line-soft);padding:6px 13px;border-radius:2px;
}
.card h3 a{transition:color .25s}
.card h3 a:hover{color:var(--gold-soft)}