/* ---------- Base ---------- */
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:"Inter",-apple-system,Segoe UI,Roboto,sans-serif;
  font-size:16px;line-height:1.55;-webkit-font-smoothing:antialiased;
}
h1,h2,h3,legend,.brand{font-family:"Bricolage Grotesque","Inter",sans-serif;line-height:1.08;margin:0}
a{color:var(--teal)}
.wrap{max-width:1140px;margin:0 auto;padding:0 20px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:var(--aqua);color:#04252b;border:none;border-radius:12px;
  padding:14px 22px;font:600 16px/1 "Inter",sans-serif;cursor:pointer;
  transition:transform .12s ease,background .12s ease;text-decoration:none;
}
.btn:hover{background:#18c2d4;transform:translateY(-1px)}
.btn.ghost{background:transparent;color:var(--deep);border:1.5px solid rgba(13,59,69,.25)}
.btn.ghost:hover{background:rgba(13,59,69,.06);transform:none}
:focus-visible{outline:3px solid var(--aqua);outline-offset:2px}

/* ---------- Header ---------- */
.site-head{background:var(--deep)}
.head-row{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{color:#fff;font-weight:700;font-size:20px;letter-spacing:-.01em}
.head-tag{color:#bfe6ec;font-size:13px}

/* ---------- Hero ---------- */
.hero{position:relative;background:linear-gradient(160deg,var(--deep),var(--teal));overflow:hidden}
.hero-caustic{
  position:absolute;inset:-20% -10% auto -10%;height:140%;pointer-events:none;opacity:.5;
  background:
    radial-gradient(40% 30% at 20% 30%, rgba(31,182,196,.55), transparent 60%),
    radial-gradient(35% 25% at 75% 20%, rgba(120,220,230,.35), transparent 60%),
    radial-gradient(45% 35% at 60% 75%, rgba(31,182,196,.30), transparent 60%);
  filter:blur(6px);animation:drift 18s ease-in-out infinite alternate;
}
@keyframes drift{from{transform:translate3d(-2%,-1%,0) scale(1.02)}to{transform:translate3d(3%,2%,0) scale(1.08)}}
.hero-grid{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center;padding:64px 20px 72px}
.hero-copy .eyebrow{color:#9fe3ec;font-weight:600;font-size:13px;letter-spacing:.08em;text-transform:uppercase;margin:0 0 14px}
.hero-copy h1{color:#fff;font-size:clamp(30px,4.4vw,50px);font-weight:700;letter-spacing:-.02em}
.hero-copy h1 em{color:var(--aqua);font-style:normal}
.hero-copy .lead{color:#d7ecef;font-size:18px;max-width:34ch;margin:20px 0 22px}
.trust{list-style:none;display:flex;flex-wrap:wrap;gap:10px;padding:0;margin:0}
.trust li{background:rgba(255,255,255,.10);color:#eaf7f9;border:1px solid rgba(255,255,255,.18);
  padding:7px 13px;border-radius:20px;font-size:13.5px;font-weight:500}

/* ---------- Form card ---------- */
.form-card{background:#fff;border-radius:20px;padding:26px;box-shadow:0 24px 60px -24px rgba(4,37,43,.5)}
.form-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:14px}
.form-head h2{font-size:22px;color:var(--deep)}
.step-count{margin:0;color:#6b8a8f;font-size:13.5px;font-weight:500;white-space:nowrap}
.progress{height:6px;border-radius:6px;background:#e2edee;overflow:hidden;margin-bottom:20px}
.progress span{display:block;height:100%;background:var(--aqua);border-radius:6px;transition:width .3s ease}
.form-flash{background:#fdeceb;color:#b03024;border-radius:10px;padding:10px 13px;font-size:14px;margin:0 0 16px}

.step{border:none;margin:0;padding:0}
.step legend{font-size:17px;color:var(--teal);font-weight:600;margin-bottom:12px;padding:0}
.field{margin-bottom:18px}
.field-label{display:block;font-size:14px;font-weight:600;color:var(--ink);margin-bottom:8px}
.req{color:var(--aqua)}
.field input[type=text],.field input[type=tel],.field input[type=email]{
  width:100%;padding:13px 14px;border:1.5px solid #d9e4e5;border-radius:11px;
  font:400 16px/1.2 "Inter",sans-serif;background:#fbfdfd;color:var(--ink);
}
.field input:focus{border-color:var(--aqua);background:#fff}
.opts{display:flex;flex-wrap:wrap;gap:9px}
.opt{position:relative;display:inline-flex;align-items:center;gap:8px;
  border:1.5px solid #d9e4e5;border-radius:11px;padding:10px 14px;cursor:pointer;
  font-size:14.5px;background:#fbfdfd;transition:border-color .12s,background .12s;user-select:none}
.opt input{position:absolute;opacity:0;pointer-events:none}
.opt:has(input:checked){border-color:var(--aqua);background:#e9fbfd;color:#065059;font-weight:600}
.opt:hover{border-color:#b6d4d8}
.field-err{display:none;color:#b03024;font-size:13px;margin:7px 0 0}
.field.invalid .field-err{display:block}
.field.invalid input,.field.invalid .opts{outline:1.5px solid #e2a19b;border-radius:11px}

.consent{display:flex;gap:11px;align-items:flex-start;background:#f4f9f9;border:1px solid #dcebec;
  border-radius:12px;padding:13px 15px;margin-top:6px;font-size:14px;cursor:pointer}
.consent input{margin-top:3px;width:18px;height:18px;accent-color:var(--aqua);flex:none}
.legal{color:#6b8a8f;font-size:12.5px;margin:11px 2px 0;line-height:1.45}

.form-nav{display:flex;gap:10px;margin-top:22px}
.form-nav .btn{flex:1}
.hp{position:absolute;left:-9999px;height:0;overflow:hidden}

/* ---------- How it works ---------- */
.how{padding:66px 0}
.section-title{font-size:clamp(24px,3vw,32px);color:var(--deep);text-align:center;margin-bottom:36px}
.steps{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.steps li{background:#fff;border:1px solid #e0ebec;border-radius:16px;padding:26px 22px}
.steps .n{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;
  border-radius:50%;background:var(--deep);color:#fff;font-family:"Bricolage Grotesque";font-weight:700;margin-bottom:14px}
.steps h3{font-size:18px;color:var(--ink);margin-bottom:7px}
.steps p{margin:0;color:#546a6e;font-size:15px}

/* ---------- Thanks ---------- */
.thanks{padding:80px 0}
.thanks-box{max-width:620px;margin:0 auto;text-align:center;background:#fff;border:1px solid #e0ebec;
  border-radius:20px;padding:48px 32px;box-shadow:0 24px 60px -30px rgba(4,37,43,.4)}
.check{width:64px;height:64px;margin:0 auto 20px;border-radius:50%;background:#e9fbfd;color:var(--teal);
  font-size:32px;display:flex;align-items:center;justify-content:center;font-weight:700}
.thanks-box h1{font-size:28px;color:var(--deep);margin-bottom:14px}
.thanks-box .lead{color:#3f5559;font-size:17px;margin:0 auto 14px;max-width:46ch}
.thanks-box .hint{color:#6b8a8f;font-size:14px;margin:0 auto 26px}

/* ---------- Footer ---------- */
.site-foot{background:var(--deep);color:#bfe6ec;padding:22px 0;font-size:13.5px}
.foot-row{display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;align-items:center}
.site-foot a{color:#bfe6ec}

/* ---------- Responsive ---------- */
@media (max-width:860px){
  .hero-grid{grid-template-columns:1fr;gap:30px;padding:44px 20px 52px}
  .hero-copy .lead{max-width:none}
  .steps{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  .hero-caustic{animation:none}
  .btn:hover{transform:none}
  html{scroll-behavior:auto}
}

/* --- page devis (enveloppe) --- */
.devis-wrap{padding:38px 0 64px}
.devis-wrap .form-card{max-width:640px;margin:0 auto}
.devis-wrap .thanks-box{max-width:620px;margin:0 auto;text-align:center;background:#fff;border:1px solid #e0ebec;border-radius:20px;padding:44px 32px}

/* --- page devis : occupe toute la hauteur, footer collé en bas --- */
body{min-height:100vh;display:flex;flex-direction:column}
.devis-wrap{flex:1 0 auto}
.site-foot{flex-shrink:0}