:root{
  --navy:#02162F;
  --navy-2:#0A2440;
  --navy-3:#12314F;
  --gold:#B98C4F;
  --gold-light:#D4B07A;
  --cream:#F6F3EC;
  --sand:#EAE3D6;
  --ink:#141922;
  --grey:#5A5A5A;
  --grey-2:#7A828C;
  --line:#E2E5EA;
  --white:#FFFFFF;
  /* Échelle d'espacement (base 8px) */
  --s1:8px;--s2:16px;--s3:24px;--s4:32px;--s5:48px;--s6:64px;--s7:96px;--s8:128px;
  --maxw:1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}}
body{font-family:'Source Sans 3',Arial,sans-serif;color:var(--ink);background:var(--white);line-height:1.7;font-size:17px;-webkit-font-smoothing:antialiased}
h1,h2,h3,.brand{font-family:'Cormorant Garamond',Georgia,serif;letter-spacing:-.01em}
a{color:inherit}
img{max-width:100%}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 40px}
@media (max-width:700px){.wrap{padding:0 24px}}

/* ---- Barre haute ---- */
.topbar{background:var(--navy);color:#B7C2CE;font-size:13.5px;padding:9px 0;border-bottom:1px solid rgba(255,255,255,.06)}
.topbar .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;align-items:center}
.topbar a{color:var(--gold-light);text-decoration:none}
.topbar a:hover,.topbar a:focus{text-decoration:underline}

/* ---- Navigation ---- */
.nav{background:var(--navy);position:sticky;top:0;z-index:50;border-bottom:1px solid rgba(255,255,255,.08)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;min-height:74px;gap:16px}
.nav .logo{display:flex;align-items:center;text-decoration:none;line-height:1}
.nav .logo img{height:44px;width:auto;display:block}
.nav-links{display:flex;gap:36px;list-style:none;align-items:center}
.nav-links a{color:#CBD4DE;text-decoration:none;font-size:14px;font-weight:600;letter-spacing:.6px;text-transform:uppercase;padding:8px 0;position:relative;transition:color .2s}
.nav-links a::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;background:var(--gold);transform:scaleX(0);transform-origin:left;transition:transform .25s}
.nav-links a:hover,.nav-links a:focus,.nav-links a.active{color:#fff}
.nav-links a:hover::after,.nav-links a:focus::after,.nav-links a.active::after{transform:scaleX(1)}
.nav .nav-cta{background:var(--gold);color:var(--navy);padding:11px 22px;text-transform:uppercase;font-size:13px;letter-spacing:.6px;transition:background .2s}
.nav .nav-cta::after{display:none}
.nav .nav-cta:hover,.nav .nav-cta:focus{background:var(--gold-light);color:var(--navy)}
.nav-toggle{display:none;align-items:center;justify-content:center;background:none;border:1.5px solid var(--gold);color:var(--gold-light);min-width:44px;min-height:44px;padding:0;cursor:pointer;border-radius:3px}
.nav-toggle svg{width:24px;height:24px;stroke:currentColor;display:block}
.nav-toggle .icon-close{display:none}
.nav-toggle[aria-expanded="true"] .icon-open{display:none}
.nav-toggle[aria-expanded="true"] .icon-close{display:block}

/* ---- Héro éditorial ---- */
.hero{background:var(--navy);color:var(--white);position:relative;overflow:hidden}
.hero.cover{min-height:640px;display:flex;align-items:flex-end;background:linear-gradient(90deg,rgba(2,22,47,.90) 0%,rgba(2,22,47,.62) 55%,rgba(2,22,47,.35) 100%),url('assets/chantier-bardage-lyon.jpg');background-size:cover;background-position:center}
.hero.cover .wrap{width:100%;padding-top:var(--s7);padding-bottom:var(--s7)}
.hero.compact{padding:var(--s6) 0 var(--s5)}
.hero .kicker{display:inline-flex;align-items:center;gap:12px;color:var(--gold-light);font-family:'Source Sans 3',sans-serif;font-size:13px;font-weight:700;letter-spacing:2.5px;text-transform:uppercase;margin-bottom:var(--s3)}
.hero .kicker::before{content:"";width:36px;height:2px;background:var(--gold)}
.hero h1{font-size:clamp(34px,5vw,60px);font-weight:600;text-align:left;max-width:16ch;margin:0;line-height:1.08}
.hero.compact h1{max-width:22ch}
.hero h1 em{font-style:normal;color:var(--gold-light)}
.hero p.lede{text-align:left;max-width:56ch;margin:var(--s3) 0 0;color:#D2DAE3;font-size:19px;line-height:1.6}
.hero .cta-row{display:flex;justify-content:flex-start;gap:var(--s2);margin-top:var(--s5);flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:15px 30px;text-decoration:none;font-family:'Source Sans 3',sans-serif;font-weight:700;font-size:14px;letter-spacing:.6px;text-transform:uppercase;border:1.5px solid var(--gold);transition:background .2s,color .2s,border-color .2s;cursor:pointer}
.btn-gold{background:var(--gold);color:var(--navy)}
.btn-gold:hover,.btn-gold:focus{background:var(--gold-light);border-color:var(--gold-light)}
.btn-ghost{color:#fff;border-color:rgba(255,255,255,.5)}
.btn-ghost:hover,.btn-ghost:focus{background:rgba(255,255,255,.1);border-color:#fff}

/* ---- Bandeau chiffres (sobre, intégré) ---- */
.statbar{background:var(--navy);color:#fff;border-top:2px solid var(--gold)}
.statbar .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--s2);padding:var(--s5) 40px}
.statbar .item{padding:0 var(--s2);border-left:1px solid rgba(255,255,255,.12)}
.statbar .item:first-child{border-left:none;padding-left:0}
.statbar .n{font-family:'Cormorant Garamond',serif;font-size:clamp(38px,4vw,52px);color:var(--gold-light);font-weight:600;line-height:1}
.statbar .l{font-size:14px;color:#AEB9C5;margin-top:6px;line-height:1.4}
@media (max-width:820px){.statbar .wrap{grid-template-columns:1fr 1fr;gap:var(--s4) var(--s2)}}

/* ---- Bande garanties ---- */
.pillars{background:var(--cream);padding:var(--s7) 0}
.pillars .wrap{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--s5)}
.pillar{padding-top:var(--s2)}
.pillar .idx{font-family:'Cormorant Garamond',serif;font-size:20px;color:var(--gold);font-weight:600;display:block;margin-bottom:var(--s2);letter-spacing:2px}
.pillar h3{color:var(--navy);font-size:23px;font-weight:700;margin-bottom:var(--s1);line-height:1.2}
.pillar p{color:var(--grey);font-size:15.5px}
.pillar + .pillar{border-left:1px solid var(--line);padding-left:var(--s5)}
@media (max-width:880px){.pillar + .pillar{border-left:none;padding-left:0}}

/* ---- Sections génériques ---- */
section.block{padding:var(--s7) 0}
section.block.tight{padding:var(--s6) 0}
.eyebrow{color:var(--gold);font-weight:700;font-size:12.5px;letter-spacing:2.5px;text-transform:uppercase;font-family:'Source Sans 3',sans-serif;display:inline-flex;align-items:center;gap:12px}
.eyebrow::before{content:"";width:28px;height:2px;background:var(--gold)}
h2{color:var(--navy);font-size:clamp(30px,3.6vw,42px);font-weight:600;margin:var(--s2) 0 var(--s3);line-height:1.12;max-width:20ch}
.lead{color:var(--grey);max-width:64ch;font-size:18.5px;line-height:1.65}
/* En-tête de section sur deux colonnes (éditorial) */
.section-head{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:var(--s6);align-items:end;margin-bottom:var(--s6)}
.section-head h2{margin-bottom:0}
.section-head .lead{margin:0}
@media (max-width:860px){.section-head{grid-template-columns:1fr;gap:var(--s3);margin-bottom:var(--s5)}}

/* ---- Savoir-faire ---- */
.skills{display:grid;grid-template-columns:1fr 1fr;gap:0;margin-top:var(--s2);border-top:1px solid var(--line)}
.skill{padding:var(--s4) var(--s4) var(--s4) 0;border-bottom:1px solid var(--line)}
.skill:nth-child(odd){border-right:1px solid var(--line);padding-right:var(--s5)}
.skill:nth-child(even){padding-left:var(--s5)}
.skill .idx{font-family:'Source Sans 3',sans-serif;font-size:13px;font-weight:700;color:var(--gold);letter-spacing:1.5px;display:block;margin-bottom:var(--s1)}
.skill h3{color:var(--navy);font-size:23px;font-weight:700;line-height:1.2}
.skill p{color:var(--grey);font-size:15.5px;margin-top:var(--s1)}
@media (max-width:700px){.skills{grid-template-columns:1fr}.skill,.skill:nth-child(odd),.skill:nth-child(even){padding:var(--s3) 0;border-right:none}}

/* ---- Étapes (process) ---- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--s5);margin-top:var(--s2);counter-reset:step}
.step{position:relative;padding-top:var(--s4);border-top:2px solid var(--navy)}
.step .num{font-family:'Cormorant Garamond',serif;font-size:52px;color:var(--gold);font-weight:600;line-height:1;display:block}
.step h3{color:var(--navy);font-size:21px;font-weight:700;margin:var(--s2) 0 var(--s1)}
.step p{color:var(--grey);font-size:15.5px}

/* ---- Référence / galeries ---- */
.reference{background:var(--navy);color:var(--white)}
.reference .eyebrow{color:var(--gold-light)}
.reference .eyebrow::before{background:var(--gold-light)}
.reference h2{color:var(--white)}
.reference p.desc{max-width:60ch;color:#C9D3DE;font-size:18px}
.ref-head{display:grid;grid-template-columns:1.3fr 1fr;gap:var(--s6);align-items:end;margin-bottom:var(--s5)}
.ref-head .ref-stats{margin:0}
.ref-stats{display:grid;grid-template-columns:repeat(3,auto);gap:var(--s5);justify-content:start}
.stat .n{font-family:'Cormorant Garamond',serif;font-size:52px;color:var(--gold-light);font-weight:600;line-height:1}
.stat .l{font-size:13.5px;color:#AEB9C5;margin-top:6px;max-width:16ch;line-height:1.4}
@media (max-width:860px){.ref-head{grid-template-columns:1fr;gap:var(--s4)}.ref-stats{gap:var(--s4)}}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--s1)}
.gallery figure{position:relative;overflow:hidden;margin:0}
.gallery img{width:100%;height:240px;object-fit:cover;display:block;filter:saturate(.96);transition:transform .5s ease}
.gallery figure:hover img{transform:scale(1.04)}
@media (prefers-reduced-motion: reduce){.gallery figure:hover img{transform:none}}
.gallery figure.tall{grid-row:span 2}
.gallery figure.tall img{height:calc(480px + var(--s1))}
.gallery figcaption{position:absolute;left:0;right:0;bottom:0;background:linear-gradient(transparent,rgba(2,22,47,.92));color:#EAE4D8;font-size:12.5px;letter-spacing:.3px;padding:var(--s4) var(--s2) var(--s1)}
.gallery .span2{grid-column:span 2}

/* ---- Trust & Authority : conformité en évidence ---- */
.trust{background:var(--white);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.trust .grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--s2)}
.trust .badge{padding:var(--s4) var(--s3);border-left:1px solid var(--line)}
.trust .badge:first-child{border-left:none;padding-left:0}
.trust .badge .ic{color:var(--gold);margin-bottom:var(--s2)}
.trust .badge .ic svg{width:38px;height:38px;stroke:currentColor;fill:none}
.trust .badge h3{color:var(--navy);font-size:18px;font-weight:700;line-height:1.25;margin-bottom:6px}
.trust .badge p{color:var(--grey);font-size:14.5px;line-height:1.5}
.trust .assurance{display:flex;align-items:flex-start;gap:var(--s2);margin-top:var(--s5);padding-top:var(--s4);border-top:2px solid var(--navy)}
.trust .assurance .seal{flex-shrink:0;color:var(--gold)}
.trust .assurance .seal svg{width:44px;height:44px;stroke:currentColor;fill:none}
.trust .assurance p{font-size:16.5px;line-height:1.55;color:var(--ink)}
.trust .assurance strong{color:var(--navy)}
@media (max-width:860px){.trust .grid{grid-template-columns:1fr 1fr}.trust .badge:nth-child(3){border-left:none;padding-left:0}}
@media (max-width:520px){.trust .grid{grid-template-columns:1fr}.trust .badge{border-left:none;padding-left:0;border-top:1px solid var(--line);padding-top:var(--s3)}.trust .badge:first-child{border-top:none}}

/* ---- Projets (page réalisations) ---- */
.projects{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--s6) var(--s5);margin-top:var(--s2)}
.project figure{margin:0;overflow:hidden}
.project img{width:100%;height:320px;object-fit:cover;display:block;transition:transform .5s ease}
.project figure:hover img{transform:scale(1.03)}
@media (prefers-reduced-motion: reduce){.project figure:hover img{transform:none}}
.project .meta{padding:var(--s3) 0 0}
.project h3{color:var(--navy);font-size:24px;font-weight:700;line-height:1.2}
.project .tag{display:inline-block;color:var(--gold);font-size:12.5px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;margin-top:var(--s2)}
.project p{color:var(--grey);font-size:15.5px;margin-top:var(--s1)}

/* ---- Conformité ---- */
.conf .cols{display:grid;grid-template-columns:1fr 1fr;gap:var(--s6);align-items:start;margin-top:var(--s2)}
.conf p{color:var(--grey)}
.doc-list{list-style:none;padding:0;border-top:2px solid var(--navy)}
.doc-list li{padding:var(--s2) 0 var(--s2) 34px;position:relative;color:var(--ink);font-size:16px;border-bottom:1px solid var(--line)}
.doc-list li:last-child{border-bottom:none}
.doc-list li::before{content:"";position:absolute;left:0;top:19px;width:18px;height:18px;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23B98C4F' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");background-size:contain;background-repeat:no-repeat}
@media (max-width:860px){.conf .cols{grid-template-columns:1fr;gap:var(--s4)}}

/* ---- Bandeau CTA ---- */
.cta-band{background:var(--navy);color:var(--white);padding:var(--s7) 0;position:relative}
.cta-band .wrap{display:grid;grid-template-columns:1.3fr 1fr;gap:var(--s5);align-items:center}
.cta-band h2{color:var(--white);margin:0}
.cta-band p{color:#C9D3DE;max-width:52ch;margin:var(--s2) 0 0}
.cta-band .cta-action{display:flex;justify-content:flex-end}
@media (max-width:820px){.cta-band .wrap{grid-template-columns:1fr;gap:var(--s3)}.cta-band .cta-action{justify-content:flex-start}}

/* ---- Contact / formulaire ---- */
.contact{background:var(--cream)}
.contact .inner{display:grid;grid-template-columns:1fr 1fr;gap:var(--s6);align-items:start}
.contact h2{margin-bottom:var(--s1)}
.contact p{color:var(--grey);max-width:52ch}
.card{background:var(--navy);color:var(--white);padding:var(--s4)}
.card .name{font-family:'Cormorant Garamond',serif;font-size:28px;color:var(--gold-light);font-weight:600}
.card .role{font-size:13px;letter-spacing:1.2px;text-transform:uppercase;color:#ABB7C4;margin:4px 0 var(--s3)}
.card a{display:block;color:var(--white);text-decoration:none;font-size:17px;padding:var(--s1) 0;border-bottom:1px solid rgba(255,255,255,.12)}
.card a:hover,.card a:focus{color:var(--gold-light)}
.card a:last-of-type{border-bottom:none}

.form-box{background:var(--white);padding:var(--s5) var(--s4);box-shadow:0 20px 50px rgba(2,22,47,.08)}
.field{margin-bottom:var(--s3)}
.field label{display:block;font-family:'Source Sans 3',sans-serif;font-weight:600;font-size:13px;letter-spacing:.4px;text-transform:uppercase;color:var(--navy);margin-bottom:8px}
.field input,.field textarea,.field select{width:100%;padding:13px 14px;border:1px solid #CFC7B6;background:#FCFAF5;font-family:inherit;font-size:16px;color:var(--ink);transition:border-color .15s,box-shadow .15s}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 3px rgba(185,140,79,.15)}
.field textarea{min-height:130px;resize:vertical}
.radio-row{display:flex;gap:var(--s2);flex-wrap:wrap}
.radio-card{flex:1;min-width:180px;position:relative}
.radio-card input{position:absolute;opacity:0}
.radio-card label{display:block;border:1px solid #CFC7B6;background:#FCFAF5;padding:15px 16px;cursor:pointer;font-weight:600;font-size:15px;color:var(--grey);transition:border-color .15s,background .15s,color .15s;margin:0;text-transform:none;letter-spacing:0}
.radio-card label small{display:block;font-weight:400;font-size:13px;color:#6E6E6E;margin-top:3px}
.radio-card input:checked + label{border-color:var(--gold);background:var(--cream);color:var(--navy)}
.radio-card input:focus-visible + label{outline:3px solid var(--gold-light);outline-offset:2px}

footer{background:var(--navy);color:#8FA0B2;font-size:13px;padding:var(--s5) 0}
footer .wrap{text-align:left}
footer span{color:var(--gold-light)}
footer .fnav{margin-bottom:var(--s2);display:flex;flex-wrap:wrap;gap:var(--s3)}
footer .fnav a{color:#B7C2CE;text-decoration:none;font-size:14px}
footer .fnav a:hover{color:var(--gold-light)}

a:focus-visible,.btn:focus-visible{outline:3px solid var(--gold-light);outline-offset:2px}

@media (max-width:880px){
  .nav-toggle{display:flex}
  .nav .nav-cta{display:none}
  .nav-links{display:none;position:absolute;top:74px;left:0;right:0;background:var(--navy);flex-direction:column;gap:0;padding:var(--s1) 0;border-bottom:2px solid var(--gold)}
  .nav-links.open{display:flex}
  .nav-links a{display:block;padding:14px 24px;width:100%;border-bottom:1px solid rgba(255,255,255,.06)}
  .nav-links a::after{display:none}
  .pillars .wrap{grid-template-columns:1fr;gap:var(--s4)}
  .skills,.steps,.projects{grid-template-columns:1fr}
  .gallery{grid-template-columns:repeat(2,1fr)}
  .gallery figure.tall img{height:240px}
  .conf .cols,.contact .inner{grid-template-columns:1fr;gap:var(--s4)}
  .hero.cover{min-height:520px}
  .hero.cover .wrap{padding-top:var(--s6);padding-bottom:var(--s5)}
}

/* ---- Lightbox ---- */
.lightbox{display:none;position:fixed;inset:0;z-index:200;background:rgba(2,22,47,.94);align-items:center;justify-content:center;padding:30px;cursor:zoom-out}
.lightbox.open{display:flex}
.lightbox img{max-width:92%;max-height:88vh;object-fit:contain;box-shadow:0 20px 60px rgba(0,0,0,.5)}

/* ---- Bouton contact flottant ---- */
.float-contact{position:fixed;right:18px;bottom:18px;z-index:90;display:flex;gap:10px}
.float-contact a{display:flex;align-items:center;gap:8px;background:var(--gold);color:var(--navy);text-decoration:none;font-weight:700;font-size:15px;padding:13px 20px;border-radius:50px;box-shadow:0 8px 24px rgba(2,22,47,.35);transition:background .2s}
.float-contact a svg{width:20px;height:20px;stroke:currentColor;flex-shrink:0;display:block}
.float-contact a:hover,.float-contact a:focus{background:var(--gold-light)}
.float-contact .fc-tel{background:var(--navy);color:var(--gold-light);border:1.5px solid var(--gold)}
.float-contact .fc-tel:hover{background:var(--navy-2)}
@media (max-width:900px){
  .float-contact{right:14px;bottom:14px}
  .float-contact a span{display:none}
  .float-contact a{padding:15px;border-radius:50%}
  .float-contact a svg{width:22px;height:22px}
}

/* ---- FAQ ---- */
.faq{margin-top:var(--s2);max-width:860px;border-top:1px solid var(--line)}
.faq details{background:transparent;border-bottom:1px solid var(--line);margin:0;padding:0}
.faq summary{cursor:pointer;padding:var(--s3) 46px var(--s3) 0;font-weight:700;color:var(--navy);font-size:18px;list-style:none;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:8px;top:22px;color:var(--gold);font-size:26px;font-weight:400;line-height:1;transition:transform .2s}
.faq details[open] summary::after{content:"–"}
.faq details p{padding:0 46px var(--s3) 0;color:var(--grey);font-size:16px;margin:0}

/* ---- Lien d'évitement (accessibilité clavier) ---- */
.skip-link{position:absolute;left:-9999px;top:0;z-index:300;background:var(--gold);color:var(--navy);padding:12px 20px;font-weight:700;text-decoration:none}
.skip-link:focus{left:12px;top:12px;outline:3px solid var(--navy)}

/* ---- État de chargement du bouton d'envoi ---- */
.btn[aria-busy="true"]{opacity:.75;pointer-events:none;position:relative}
.btn[aria-busy="true"]::after{content:"";width:15px;height:15px;margin-left:10px;border:2px solid rgba(2,22,47,.35);border-top-color:var(--navy);border-radius:50%;display:inline-block;vertical-align:middle;animation:btn-spin .7s linear infinite}
@keyframes btn-spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion: reduce){.btn[aria-busy="true"]::after{animation:none}}

/* ---- Accessibilité lightbox ---- */
.lightbox-close{position:absolute;top:18px;right:28px;background:none;border:none;color:var(--gold-light);font-size:44px;line-height:1;cursor:pointer;font-family:Arial,sans-serif;padding:0 8px}
.lightbox-close:hover,.lightbox-close:focus-visible{color:#fff;outline:3px solid var(--gold-light);outline-offset:2px}