/* =====================================================================
   Cabinet YNA — feuille de style des pages d'expertise
   Reprend exactement la charte de index.html (couleurs, typo, boutons).
   Un seul fichier à modifier pour toutes les pages.
   ===================================================================== */
:root{
  --navy:#1b4f8a;
  --navy-2:#2a6cb5;
  --steel:#6aa9dc;
  --sky:#eaf3fb;
  --ink:#1c2b3a;
  --grey:#5f6b7a;
  --line:#d6e4f2;
  --gold:#b3874a;
  --sans:'Helvetica Neue',Helvetica,Arial,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--ink);background:#fff;font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{display:block}
.wrap{max-width:1200px;margin:0 auto;padding:0 30px}
h1,h2,h3{font-weight:300;letter-spacing:.01em}

/* ===== Nav (identique à l'accueil) ===== */
header{position:sticky;top:0;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);z-index:100;border-bottom:1px solid var(--line)}
header .wrap{display:flex;align-items:center;justify-content:space-between;height:86px;flex-wrap:nowrap;gap:20px}
.logo{font-size:20px;font-weight:300;letter-spacing:.24em;text-transform:uppercase;color:var(--navy)}
nav ul{display:flex;gap:26px;list-style:none;flex-wrap:nowrap}
nav a{font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--navy);padding:6px 0;border-bottom:2px solid transparent;transition:border-color .2s;white-space:nowrap}
nav a:hover{border-color:var(--gold)}
nav a.on{border-color:var(--gold);font-weight:500}
.nav-right{display:flex;align-items:center;gap:22px;flex-wrap:nowrap}
.nav-tel{font-size:13px;letter-spacing:.06em;color:var(--grey);white-space:nowrap}
.btn{display:inline-block;padding:14px 32px;font-size:12px;letter-spacing:.18em;text-transform:uppercase;border:1px solid var(--navy);color:var(--navy);transition:all .25s;background:transparent;cursor:pointer;border-radius:2px;white-space:nowrap}
.btn:hover{background:var(--navy);color:#fff}
.btn.solid{background:var(--navy);color:#fff}
.btn.solid:hover{background:var(--navy-2)}
.btn.inv{border-color:#fff;color:#fff}
.btn.inv:hover{background:#fff;color:var(--navy)}
.btn.gold{background:var(--gold);border-color:var(--gold);color:#fff}
.btn.gold:hover{background:#9a7238;border-color:#9a7238}

/* ===== Hero de page intérieure ===== */
.page-hero{background:linear-gradient(rgba(20,62,110,.86),rgba(42,108,181,.72)),
  url('https://images.unsplash.com/photo-1589829545856-d10d557cf95f?auto=format&fit=crop&w=1920&q=80') center/cover;
  color:#fff;padding:70px 0 78px}
.page-hero .fil{font-size:12px;letter-spacing:.08em;color:#c3d4e8;margin-bottom:26px}
.page-hero .fil a:hover{color:#fff;border-bottom:1px solid var(--gold)}
.page-hero .fil span{margin:0 6px;color:#8fa8c6}
.page-hero .surtitre{font-size:12px;letter-spacing:.3em;text-transform:uppercase;color:#cdb488;margin-bottom:18px}
.page-hero h1{font-size:42px;font-weight:200;line-height:1.25;margin-bottom:24px;max-width:900px}
.page-hero .chapo{max-width:800px;color:#dbe4ef;font-size:16.5px;font-weight:300}
.page-hero .actions{margin-top:38px;display:flex;gap:18px;flex-wrap:wrap}

/* ===== Sections ===== */
section{padding:90px 0}
.sec-title{font-size:34px;font-weight:200;color:var(--navy);margin-bottom:10px}
.sec-sub{color:var(--grey);font-weight:300;margin-bottom:56px}
.link{font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--navy);border-bottom:1px solid var(--gold);padding-bottom:3px;white-space:nowrap}
.link:hover{color:var(--steel)}

/* ===== Cartes interventions (style .exp de l'accueil) ===== */
.expertises{background:var(--sky)}
.exp-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:34px}
.exp{background:#fff;padding:38px 32px;border-top:3px solid var(--navy);border-radius:2px;box-shadow:0 6px 24px rgba(14,42,77,.05);transition:transform .25s,box-shadow .25s}
.exp:hover{transform:translateY(-5px);box-shadow:0 16px 36px rgba(14,42,77,.10)}
.exp .num{font-size:13px;color:var(--gold);letter-spacing:.1em;display:block;margin-bottom:14px}
.exp h3{font-size:20px;font-weight:500;color:var(--navy);margin-bottom:12px}
.exp p{font-size:14.5px;color:var(--grey);font-weight:300}

/* ===== Méthode ===== */
.methode{background:#fff}
.etapes{display:grid;grid-template-columns:repeat(3,1fr);gap:44px}
.etape b{display:block;font-size:38px;font-weight:200;color:var(--gold);line-height:1;margin-bottom:14px}
.etape h3{font-size:19px;font-weight:500;color:var(--navy);margin-bottom:10px}
.etape p{font-size:14.5px;color:var(--grey);font-weight:300}

/* ===== FAQ ===== */
.faq{background:var(--sky)}
.qa{background:#fff;border:1px solid var(--line);border-radius:2px;margin-bottom:14px;overflow:hidden}
.qa summary{cursor:pointer;padding:22px 56px 22px 28px;font-size:16.5px;font-weight:500;color:var(--navy);list-style:none;position:relative}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{content:"+";position:absolute;right:26px;top:18px;color:var(--gold);font-size:24px;font-weight:300}
.qa[open] summary::after{content:"–"}
.qa-body{padding:0 28px 24px;color:var(--grey);font-weight:300;font-size:15px}
.avert{margin-top:24px;font-size:13px;color:var(--grey);font-weight:300;font-style:italic}

/* ===== CTA (identique à l'accueil) ===== */
.cta{position:relative;color:#fff;text-align:center;
  background:linear-gradient(rgba(10,29,54,.82),rgba(10,29,54,.82)),
  url('https://images.unsplash.com/photo-1505664194779-8beaceb93744?auto=format&fit=crop&w=1920&q=80') center/cover}
.cta .wrap{padding-top:95px;padding-bottom:95px}
.cta h2{font-size:32px;font-weight:200;margin-bottom:16px}
.cta p{color:#c9d6e6;font-weight:300;margin-bottom:38px}
.cta .actions{display:flex;justify-content:center;gap:18px;flex-wrap:wrap}

/* ===== Pages voisines ===== */
.voisines{padding:46px 0}
.voisines .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}

/* ===== Footer (identique à l'accueil) ===== */
footer{background:var(--navy);color:#9db1ca;font-size:13.5px;font-weight:300}
footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:50px;padding:70px 0 50px}
footer h4{color:#fff;font-size:11.5px;letter-spacing:.22em;text-transform:uppercase;font-weight:600;margin-bottom:18px}
footer ul{list-style:none}
footer li{margin-bottom:9px}
footer a:hover{color:#fff}
.f-logo{font-size:19px;letter-spacing:.24em;text-transform:uppercase;color:#fff;font-weight:300;margin-bottom:18px}
.f-logo b{font-weight:700;color:var(--gold)}
.legal{border-top:1px solid #1c3d68;padding:22px 0;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:12.5px}

/* ===== Responsive ===== */
@media(max-width:1100px){ nav ul{gap:18px} nav a{font-size:11.5px;letter-spacing:.1em} }
@media(max-width:960px){
  nav ul,.nav-tel{display:none}
  .page-hero h1{font-size:29px}
  .page-hero{padding:48px 0 56px}
  .exp-grid,.etapes{grid-template-columns:1fr}
  footer .cols{grid-template-columns:1fr 1fr}
  section{padding:60px 0}
  .voisines .wrap{flex-direction:column;gap:14px}
}
@media(max-width:560px){
  footer .cols{grid-template-columns:1fr}
  .btn{padding:13px 22px;font-size:11.5px}
}

/* ===== Accessibilité : focus visible au clavier ===== */
a:focus-visible,summary:focus-visible,.btn:focus-visible{outline:3px solid var(--steel);outline-offset:3px;border-radius:2px}