:root{
  --bg:#f7f5f1; --surface:#ffffff; --ink:#1c1f24; --muted:#5d636d; --line:#e4e0d8;
  --brand:#c2562b; --brand-ink:#ffffff; --brand-soft:#f6e4da; --dark:#1f2a33;
  --radius:14px; --shadow:0 10px 30px rgba(20,25,30,.08);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#121518; --surface:#1b2026; --ink:#eef0f2; --muted:#a3aab3; --line:#2b323a;
    --brand:#e0723f; --brand-soft:#33241d; --dark:#0c0f12; --shadow:0 10px 30px rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"]{
  --bg:#121518; --surface:#1b2026; --ink:#eef0f2; --muted:#a3aab3; --line:#2b323a;
  --brand:#e0723f; --brand-soft:#33241d; --dark:#0c0f12; --shadow:0 10px 30px rgba(0,0,0,.35);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:68px}
body{font-family:Inter,system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6;font-size:16px}
a{color:inherit}
[hidden]{display:none!important}
.wrap{max-width:1120px;margin:0 auto;padding:0 16px}
.narrow{max-width:820px}

/* header : transparent sur l'image, opaque après défilement */
header{position:fixed;top:0;left:0;right:0;z-index:20;color:#fff;transition:background .25s,color .25s,border-color .25s;border-bottom:1px solid transparent}
header.scrolled{background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(10px);color:var(--ink);border-color:var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:68px;position:relative}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;letter-spacing:.5px;text-decoration:none}
.logo-mark{width:36px;height:36px;border-radius:9px;background:var(--brand);display:grid;place-items:center;color:#fff}
.logo small{display:block;font-size:11px;font-weight:500;opacity:.75;letter-spacing:1.5px;text-transform:uppercase;line-height:1}
nav ul{display:flex;gap:28px;list-style:none}
nav a{text-decoration:none;opacity:.85;font-weight:500;font-size:15px}
nav a:hover{opacity:1}
.btn{display:inline-flex;align-items:center;gap:8px;background:var(--brand);color:var(--brand-ink);padding:12px 22px;border-radius:999px;font-weight:600;text-decoration:none;border:0;cursor:pointer;font-size:15px;font-family:inherit}
.btn:hover{filter:brightness(1.07)}
.btn:disabled{opacity:.6;cursor:wait}
.btn.ghost-light{background:rgba(255,255,255,.12);color:#fff;border:1.5px solid rgba(255,255,255,.45);backdrop-filter:blur(4px)}
.menu-btn{display:none;background:none;border:0;color:inherit;font-size:26px;cursor:pointer}

/* hero plein écran */
.hero{position:relative;min-height:100vh;min-height:100svh;display:flex;align-items:center;color:#fff;overflow:hidden;
  background:radial-gradient(120% 90% at 80% 20%,#3b4a57 0%,#1f2a33 55%,#141a20 100%)}
.hero-bg,.hero-bg img{position:absolute;inset:0;width:100%;height:100%}
.hero-bg img{object-fit:cover;object-position:70% 85%}
.hero-shade{position:absolute;inset:0;background:linear-gradient(90deg,rgba(12,16,20,.72) 0%,rgba(12,16,20,.38) 38%,rgba(12,16,20,0) 62%),linear-gradient(0deg,rgba(12,16,20,.3),transparent 25%)}
.hero-inner{position:relative;width:100%;padding-top:96px;padding-bottom:80px}
.eyebrow{display:inline-block;background:rgba(194,86,43,.9);color:#fff;font-weight:600;font-size:13px;padding:6px 12px;border-radius:999px;margin-bottom:18px}
h1{font-size:clamp(36px,5.6vw,64px);line-height:1.05;letter-spacing:-1.4px;font-weight:800;margin-bottom:18px;max-width:720px;text-shadow:0 2px 20px rgba(0,0,0,.25)}
h1 em{font-style:normal;color:#ffb38d}
.lead{font-size:clamp(16px,1.6vw,19px);color:rgba(255,255,255,.88);max-width:540px;margin-bottom:28px}
.cta-row{display:flex;gap:12px;flex-wrap:wrap}
.trust{display:flex;gap:22px;flex-wrap:wrap;margin-top:32px;color:rgba(255,255,255,.85);font-size:14px}
.trust span::before{content:"✓ ";color:#ffb38d;font-weight:700}
.scroll-hint{position:absolute;bottom:22px;left:50%;transform:translateX(-50%);color:#fff;text-decoration:none;font-size:22px;opacity:.7;animation:bob 2s infinite}
@keyframes bob{50%{transform:translate(-50%,6px)}}
@media (prefers-reduced-motion:reduce){.scroll-hint{animation:none}}

/* sections */
section{padding:80px 0}
.sec-head{max-width:640px;margin-bottom:40px}
h2{font-size:clamp(28px,3.4vw,38px);letter-spacing:-.8px;line-height:1.15;margin-bottom:12px}
.sec-head p{color:var(--muted);font-size:17px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.card .ico{width:46px;height:46px;border-radius:12px;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;font-size:22px;margin-bottom:16px}
.card h3{font-size:19px;margin-bottom:8px}
.card p{color:var(--muted);font-size:15px}

.band{background:var(--dark);color:#eef0f2}
.band .sec-head p,.band .card p,.muted-light{color:#b5bcc5}
.muted-light{font-size:17px}
.band .card{background:rgba(255,255,255,.04);border-color:rgba(255,255,255,.1)}
.band .card .ico{background:rgba(224,114,63,.18)}
.note{margin-top:24px;font-size:14px;color:#b5bcc5;border-left:3px solid var(--brand);padding-left:14px}

.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:s}
.step{position:relative;padding-top:56px}
.step::before{counter-increment:s;content:counter(s);position:absolute;top:0;left:0;width:42px;height:42px;border-radius:50%;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:700}
.step h3{font-size:18px;margin-bottom:6px}
.step p{color:var(--muted);font-size:15px}

/* réalisations avant / après */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.real{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.real .pics{display:grid;grid-template-columns:1fr 1fr;gap:2px;background:var(--line)}
.real .pics.single{grid-template-columns:1fr}
.real figure{position:relative;aspect-ratio:4/3;background:var(--bg)}
.real img{width:100%;height:100%;object-fit:cover;display:block}
.real figcaption{position:absolute;left:8px;top:8px;background:rgba(0,0,0,.6);color:#fff;font-size:11px;font-weight:700;letter-spacing:.5px;padding:3px 8px;border-radius:999px}
.real figure.after figcaption{background:var(--brand)}
.real .body{padding:16px 18px}
.real h3{font-size:16px}
.real .meta{color:var(--muted);font-size:13px}
.real p{color:var(--muted);font-size:14px;margin-top:6px}

details{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px 22px;margin-bottom:12px}
summary{font-weight:600;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:16px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--brand);font-size:22px;line-height:1}
details[open] summary::after{content:"–"}
details p{color:var(--muted);margin-top:10px}

.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:40px;align-items:start}
form{background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:18px;padding:28px;box-shadow:var(--shadow)}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
label{display:block;font-size:13px;font-weight:600;margin-bottom:6px;color:var(--muted)}
input,select,textarea{width:100%;padding:12px 14px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--ink);font:inherit;margin-bottom:14px}
input:focus,select:focus,textarea:focus{outline:2px solid var(--brand);outline-offset:1px}
textarea{min-height:100px;resize:vertical}
.hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.consent{display:flex;gap:10px;align-items:flex-start;font-size:13px;font-weight:400;color:var(--muted);margin-bottom:16px}
.consent input{width:auto;margin:4px 0 0}
.info-list{list-style:none;margin-top:24px}
.info-list li{padding:14px 0;border-bottom:1px solid rgba(255,255,255,.1);display:flex;gap:12px}
.info-list b{min-width:110px}
#form-msg{margin-top:12px;font-weight:600;min-height:1.6em}
#form-msg.ok{color:#2f8f5b}
#form-msg.err{color:#c0392b}

footer{background:var(--dark);color:#b5bcc5;padding:40px 0;font-size:14px;border-top:1px solid rgba(255,255,255,.08)}
.foot{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap}
footer a,.light{color:#eef0f2}

@media (max-width:900px){
  .contact-grid{grid-template-columns:1fr}
  .grid3,.gallery{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr 1fr}
}
@media (max-width:767px){
  /* sur téléphone : texte en haut, sur le ciel ; le chantier et le camion restent visibles en bas */
  .hero{align-items:flex-start}
  .hero-bg img{object-position:88% bottom}
  .hero-shade{background:linear-gradient(180deg,rgba(12,16,20,.8) 0%,rgba(12,16,20,.5) 28%,rgba(12,16,20,0) 45%)}
  .hero-inner{padding-top:96px;padding-bottom:0}
  .eyebrow{margin-bottom:12px}
  h1{font-size:clamp(30px,8.6vw,40px);margin-bottom:16px}
  .lead,.trust,.scroll-hint,.cta-row .ghost-light{display:none}
  .cta-row .btn{padding:12px 20px;font-size:15px}
}
@media (max-width:640px){
  nav ul{display:none;position:absolute;top:68px;left:-16px;right:-16px;flex-direction:column;gap:0;background:var(--surface);color:var(--ink);border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
  nav ul.open{display:flex}
  nav ul li a{display:block;padding:14px 16px}
  .menu-btn{display:block}
  .nav > .btn{display:none}
  .grid3,.gallery,.steps,.row{grid-template-columns:1fr}
  section{padding:56px 0}
  .trust{gap:14px}
}