/* ============================================================
   SDD GROUP — Design system "Air & Chaleur" v2 (mobile-first, ads-ready)
   Pôle froid (ventilation) : teal  |  Pôle chaud (isolation) : ambre
   Objectif : conversion appel + formulaire sur trafic publicitaire
   ============================================================ */

:root{
  --ink:#111E27;
  --ink-soft:#41535F;
  --paper:#F4F7F7;
  --white:#FFFFFF;
  --air:#12707D;
  --air-deep:#0B4750;
  --air-tint:#E1EFF0;
  --heat:#D97A26;
  --heat-deep:#A6540F;
  --heat-tint:#F9ECDC;
  --line:#DBE3E4;
  --line-soft:#EAF0F0;
  --ok:#1F8A5B;
  --flux:linear-gradient(90deg,var(--air) 0%,var(--heat) 100%);
  --radius:16px;
  --radius-sm:11px;
  --shadow:0 12px 34px rgba(17,30,39,.10);
  --shadow-lg:0 24px 60px rgba(17,30,39,.16);
  --font-display:"Bricolage Grotesque",system-ui,sans-serif;
  --font-body:"Public Sans",system-ui,-apple-system,sans-serif;
  --wrap:1160px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font-body);color:var(--ink);background:var(--paper);line-height:1.6;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit}
.container{max-width:var(--wrap);margin:0 auto;padding:0 20px}

h1,h2,h3{font-family:var(--font-display);line-height:1.1;letter-spacing:-.015em}
h1{font-size:clamp(2rem,7vw,3.5rem);font-weight:800}
h2{font-size:clamp(1.55rem,5vw,2.35rem);font-weight:700}
h3{font-size:1.15rem;font-weight:700}
p{overflow-wrap:break-word}

.flux{background-image:var(--flux);background-repeat:no-repeat;background-size:100% .16em;background-position:0 90%;padding-bottom:.04em}
.eyebrow{display:inline-flex;align-items:center;gap:.5rem;font-family:var(--font-display);font-weight:700;font-size:.75rem;letter-spacing:.13em;text-transform:uppercase;color:var(--ink-soft);margin-bottom:.85rem}
.eyebrow::before{content:"";width:24px;height:3px;border-radius:2px;background:var(--flux)}
.eyebrow.air::before{background:var(--air)}
.eyebrow.heat::before{background:var(--heat)}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;text-decoration:none;font-family:var(--font-display);font-weight:700;font-size:1.02rem;padding:.92rem 1.6rem;border-radius:999px;transition:transform .15s ease,box-shadow .15s ease,background .15s ease;text-align:center;border:0;cursor:pointer;min-height:52px;line-height:1.1;-webkit-tap-highlight-color:transparent}
.btn:active{transform:scale(.98)}
@media (hover:hover){.btn:hover{transform:translateY(-2px);box-shadow:var(--shadow)}}
.btn-primary{background:var(--heat);color:#fff}
.btn-primary:hover{background:var(--heat-deep)}
.btn-air{background:var(--air);color:#fff}
.btn-air:hover{background:var(--air-deep)}
.btn-ghost{background:transparent;border:2px solid var(--ink);color:var(--ink);min-height:48px}
.btn-call{background:var(--ok);color:#fff}
.btn-block{width:100%}

/* ---------- Top utility bar ---------- */
.topbar{background:var(--ink);color:#fff;font-size:.83rem}
.topbar .container{display:flex;justify-content:space-between;align-items:center;padding:.5rem 20px;gap:1rem}
.topbar a{color:#fff;text-decoration:none;font-weight:700}
.topbar .zone{opacity:.85;display:inline-flex;align-items:center;gap:.4rem}
.topbar .tel{display:inline-flex;align-items:center;gap:.4rem;white-space:nowrap}
.topbar .tel:hover{color:var(--heat)}

/* ---------- Navigation ---------- */
header.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav .container{display:flex;align-items:center;justify-content:space-between;padding:.65rem 20px;gap:1rem}
.brand{display:flex;align-items:center;gap:.65rem;text-decoration:none;flex-shrink:0}
.brand-mark{width:42px;height:42px;border-radius:11px;background:linear-gradient(135deg,var(--air) 0%,var(--air-deep) 52%,var(--heat) 128%);display:grid;place-items:center;color:#fff;font-family:var(--font-display);font-weight:800;font-size:.88rem;flex-shrink:0}
.brand-name{font-family:var(--font-display);font-weight:800;font-size:1.1rem;line-height:1.02}
.brand-name small{display:block;font-family:var(--font-body);font-weight:500;font-size:.66rem;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-soft)}
nav.menu{display:flex;gap:1.5rem;align-items:center}
nav.menu a{text-decoration:none;font-weight:600;font-size:.95rem;color:var(--ink-soft);padding:.3rem 0;border-bottom:2px solid transparent}
nav.menu a:hover{color:var(--ink)}
nav.menu a[aria-current="page"]{color:var(--ink);border-bottom:2px solid var(--heat)}
.nav-cta{display:flex;align-items:center;gap:.6rem}
.nav-tel{display:inline-flex;align-items:center;gap:.4rem;font-family:var(--font-display);font-weight:800;color:var(--ink);text-decoration:none;font-size:1rem;white-space:nowrap}
.nav-tel:hover{color:var(--air)}
.nav-toggle{display:none;background:none;border:0;font-size:1.7rem;cursor:pointer;color:var(--ink);line-height:1;padding:.2rem}

/* ---------- HERO (conversion-focused) ---------- */
.hero{background:var(--white);border-bottom:1px solid var(--line);overflow:hidden;position:relative}
.hero::after{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(circle at 12% 0%,rgba(18,112,125,.06),transparent 42%),radial-gradient(circle at 100% 100%,rgba(217,122,38,.07),transparent 42%)}
.hero .container{position:relative;z-index:1;display:grid;grid-template-columns:1.08fr .92fr;gap:2.6rem;align-items:center;padding-top:3.2rem;padding-bottom:3.2rem}
.hero h1{margin-bottom:1rem}
.hero p.lead{font-size:1.1rem;color:var(--ink-soft);margin-bottom:1.5rem;max-width:33rem}
.hero-ctas{display:flex;gap:.75rem;flex-wrap:wrap;margin-bottom:1.4rem}
.trust-badges{display:flex;flex-wrap:wrap;gap:.5rem}
.badge{display:inline-flex;align-items:center;gap:.4rem;background:var(--paper);border:1px solid var(--line);border-radius:999px;padding:.4rem .85rem;font-size:.82rem;font-weight:600;color:var(--ink-soft)}
.badge svg{width:15px;height:15px;color:var(--ok);flex-shrink:0}

/* Lead form card in hero */
.lead-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:1.6rem 1.5rem;position:relative}
.lead-card::before{content:"";position:absolute;top:0;left:1.5rem;right:1.5rem;height:4px;border-radius:0 0 4px 4px;background:var(--flux)}
.lead-card h2{font-size:1.3rem;margin-bottom:.25rem}
.lead-card .sub{font-size:.9rem;color:var(--ink-soft);margin-bottom:1.1rem}
.lead-card form{display:grid;gap:.7rem}
.field label{font-weight:600;font-size:.82rem;display:block;margin-bottom:.3rem;color:var(--ink)}
input,select,textarea{font-family:var(--font-body);font-size:16px;padding:.8rem .9rem;border:1.5px solid var(--line);border-radius:var(--radius-sm);background:var(--paper);width:100%;color:var(--ink);min-height:50px}
textarea{min-height:auto}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--air);background:#fff;box-shadow:0 0 0 3px rgba(18,112,125,.12)}
.seg{display:flex;gap:.4rem}
.seg label{flex:1;position:relative;cursor:pointer}
.seg input{position:absolute;opacity:0;pointer-events:none}
.seg span{display:flex;align-items:center;justify-content:center;min-height:46px;border:1.5px solid var(--line);border-radius:var(--radius-sm);font-weight:700;font-size:.9rem;background:var(--paper);transition:all .12s}
.seg input:checked + span{border-color:var(--heat);background:var(--heat-tint);color:var(--heat-deep)}
.seg input:focus-visible + span{box-shadow:0 0 0 3px rgba(217,122,38,.2)}
.form-note{font-size:.76rem;color:var(--ink-soft);text-align:center;margin-top:.2rem;display:flex;align-items:center;justify-content:center;gap:.35rem}
.or-call{text-align:center;margin-top:.9rem;padding-top:.9rem;border-top:1px solid var(--line-soft);font-size:.88rem;color:var(--ink-soft)}
.or-call a{font-family:var(--font-display);font-weight:800;color:var(--air);text-decoration:none;font-size:1.05rem;white-space:nowrap}

/* ---------- Trust strip ---------- */
.trust-strip{background:var(--ink);color:#fff}
.trust-strip .container{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;padding:1.4rem 20px}
.trust-item{text-align:center}
.trust-item .n{font-family:var(--font-display);font-weight:800;font-size:1.55rem;line-height:1;background-image:linear-gradient(90deg,#5FB6C4,#EFA85C);-webkit-background-clip:text;background-clip:text;color:transparent}
.trust-item .l{font-size:.8rem;color:#B7C6CD;margin-top:.3rem;line-height:1.25}

/* ---------- Generic sections ---------- */
section{padding:3.6rem 0}
.section-head{max-width:640px;margin-bottom:2rem}
.section-head p{color:var(--ink-soft);margin-top:.6rem}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:2.4rem;align-items:center}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1.3rem}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:1.3rem}
.card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:1.6rem 1.4rem}
.card h3{margin-bottom:.5rem}
.card p{color:var(--ink-soft);font-size:.95rem}
.card .ico{width:48px;height:48px;border-radius:13px;display:grid;place-items:center;margin-bottom:.9rem;font-size:1.4rem}
.ico.air{background:var(--air-tint)}
.ico.heat{background:var(--heat-tint)}
.photo{border-radius:var(--radius);box-shadow:var(--shadow);width:100%;object-fit:cover;aspect-ratio:4/3}

/* Service rows */
.service-row{display:grid;grid-template-columns:1fr 1fr;gap:2.4rem;align-items:center;padding:2.4rem 0}
.service-row + .service-row{border-top:1px solid var(--line)}
.service-row ul{list-style:none;margin:1rem 0 1.4rem;display:grid;gap:.5rem}
.service-row li{padding-left:1.7rem;position:relative;color:var(--ink-soft);font-size:.96rem}
.service-row li::before{content:"✓";position:absolute;left:0;font-weight:800}
.row-air li::before{color:var(--air)}
.row-heat li::before{color:var(--heat)}

/* Process steps */
.steps{counter-reset:step}
.step{position:relative;padding:1.5rem 1.3rem;background:var(--white);border:1px solid var(--line);border-radius:var(--radius)}
.step::before{counter-increment:step;content:counter(step,decimal-leading-zero);font-family:var(--font-display);font-weight:800;font-size:1.8rem;background-image:var(--flux);-webkit-background-clip:text;background-clip:text;color:transparent;display:block;margin-bottom:.35rem}
.step h3{font-size:1.05rem;margin-bottom:.3rem}
.step p{font-size:.9rem;color:var(--ink-soft)}

/* Primes band */
.primes{background:var(--ink);color:#fff;border-radius:var(--radius);overflow:hidden}
.primes-inner{display:grid;grid-template-columns:1.2fr .8fr;gap:2.2rem;align-items:center;padding:2.6rem 2.4rem}
.primes h2{color:#fff}
.primes p{color:#C7D2D8;margin-top:.7rem}
.primes .amount{font-family:var(--font-display);font-weight:800;font-size:clamp(2.6rem,8vw,3.8rem);background-image:linear-gradient(90deg,#5FB6C4,#F0A75B);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1}
.primes .amount-label{color:#C7D2D8;font-size:.88rem;margin-top:.4rem}

/* Reviews */
.reviews{display:grid;grid-template-columns:repeat(3,1fr);gap:1.3rem}
.review{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem 1.4rem}
.stars{color:#F5A623;font-size:1rem;letter-spacing:.05em;margin-bottom:.7rem}
.review p{font-size:.95rem;color:var(--ink);line-height:1.55}
.review .who{margin-top:1rem;font-size:.86rem;color:var(--ink-soft);font-weight:600}

/* Gallery */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:1.1rem}
.tile{position:relative;border-radius:var(--radius);overflow:hidden;background:var(--white);border:1px solid var(--line)}
.tile img{aspect-ratio:4/3;object-fit:cover;width:100%;transition:transform .3s ease}
@media(hover:hover){.tile:hover img{transform:scale(1.04)}}
.tile figcaption{padding:.85rem 1rem;font-size:.9rem;font-weight:600}
.tile figcaption span{display:block;font-weight:500;color:var(--ink-soft);font-size:.8rem}
.tag{position:absolute;top:.75rem;left:.75rem;border-radius:999px;padding:.25rem .75rem;font-size:.73rem;font-weight:700;color:#fff}
.tag.air{background:var(--air)}
.tag.heat{background:var(--heat)}

/* FAQ */
.faq{max-width:760px}
.faq details{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:1.05rem 1.3rem;margin-bottom:.7rem}
.faq summary{font-family:var(--font-display);font-weight:700;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:1rem;font-size:1rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.5rem;color:var(--heat);font-weight:400;transition:transform .2s;line-height:1}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details p{margin-top:.75rem;color:var(--ink-soft);font-size:.95rem}

/* Final CTA */
.cta-final{background:linear-gradient(120deg,var(--air-deep) 0%,var(--air) 46%,var(--heat) 122%);color:#fff;border-radius:var(--radius)}
.cta-inner{padding:2.8rem 2.4rem;display:grid;grid-template-columns:1.3fr .7fr;gap:1.8rem;align-items:center}
.cta-inner h2{color:#fff}
.cta-inner p{color:rgba(255,255,255,.9);margin-top:.6rem}
.cta-actions{display:grid;gap:.7rem}
.cta-actions .btn{background:#fff;color:var(--ink)}
.cta-actions .btn.outline{background:transparent;border:2px solid rgba(255,255,255,.85);color:#fff}

/* Contact form page */
form.devis{display:grid;gap:1rem;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:1.8rem}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:.9rem}

/* Footer */
footer{background:var(--ink);color:#B9C6CD;margin-top:3.5rem}
.footer-inner{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:2.2rem;padding:3rem 0 2.2rem}
footer h4{color:#fff;font-family:var(--font-display);font-size:1rem;margin-bottom:.85rem}
footer a{color:#B9C6CD;text-decoration:none}
footer a:hover{color:#fff}
footer ul{list-style:none;display:grid;gap:.5rem;font-size:.93rem}
.footer-brand p{font-size:.9rem;margin-top:.7rem;max-width:26rem;line-height:1.55}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:1rem 0;font-size:.8rem;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}

/* Sticky mobile action bar */
.mobile-cta{display:none;position:fixed;bottom:0;left:0;right:0;z-index:60;background:var(--white);border-top:1px solid var(--line);padding:.55rem .7rem;gap:.55rem;box-shadow:0 -6px 20px rgba(17,30,39,.10)}
.mobile-cta .btn{flex:1;min-height:50px;padding:.7rem .5rem;font-size:.95rem}
.mobile-cta .btn-call{flex:1.2}

/* Scroll reveal */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .5s ease}
.reveal.visible{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
  .btn,.tile img{transition:none}
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width:920px){
  .hero .container{grid-template-columns:1fr;gap:1.8rem;padding-top:2rem;padding-bottom:2rem}
  .grid-2,.service-row,.primes-inner,.cta-inner{grid-template-columns:1fr}
  .grid-3,.reviews,.gallery{grid-template-columns:1fr 1fr}
  .grid-4{grid-template-columns:1fr 1fr}
  .footer-inner{grid-template-columns:1fr 1fr}
  nav.menu{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;padding:1rem 20px 1.2rem;border-bottom:1px solid var(--line);gap:.3rem;align-items:stretch;box-shadow:var(--shadow)}
  nav.menu.open{display:flex}
  nav.menu a{padding:.7rem 0;border-bottom:1px solid var(--line-soft)}
  nav.menu a[aria-current="page"]{border-bottom:1px solid var(--line-soft);color:var(--air)}
  .nav-toggle{display:block}
  .nav-tel{display:none}
  .mobile-cta{display:flex}
  body{padding-bottom:66px}
  .topbar .zone{display:none}
  .topbar .container{justify-content:center}
  .service-row .photo{order:-1}
  .cta-inner{text-align:center}
  .cta-actions{max-width:340px;margin:0 auto;width:100%}
}
@media (max-width:600px){
  section{padding:2.6rem 0}
  .hero .container{padding-top:1.6rem}
  .hero p.lead{font-size:1.02rem}
  .hero-ctas{flex-direction:column}
  .hero-ctas .btn{width:100%}
  .grid-3,.grid-4,.reviews,.gallery,.form-row{grid-template-columns:1fr}
  .trust-strip .container{grid-template-columns:1fr 1fr;gap:1.1rem 1rem}
  .footer-inner{grid-template-columns:1fr;gap:1.6rem}
  .primes-inner,.cta-inner{padding:2rem 1.5rem}
  .lead-card{padding:1.4rem 1.2rem}
  .section-head{margin-bottom:1.5rem}
}

/* Anchor offset for sticky header */
#devis{scroll-margin-top:90px}