:root{
  --ink:#1d2a2f; --muted:#5e6b70; --paper:#f6f3ec; --card:#fffdf8; --line:#ddd6c8;
  --accent:#c4552b; --accent-d:#a4431f; --blue:#264b5d; --blue-l:#e5edf0;
  --radius:10px; --shadow:0 1px 2px rgba(0,0,0,.04),0 8px 24px rgba(29,42,47,.06);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:16px/1.6 Inter,system-ui,sans-serif;color:var(--ink);background:var(--paper)}
h1,h2,h3{font-family:Fraunces,Georgia,serif;line-height:1.2;margin:0 0 .5em}
h1{font-size:clamp(2rem,4.5vw,3.1rem)} h2{font-size:clamp(1.5rem,3vw,2.1rem)} h3{font-size:1.15rem}
a{color:var(--blue)}
.wrap{max-width:1140px;margin:0 auto;padding:0 20px}
.muted{color:var(--muted)} .tiny{font-size:.8rem}

/* Nav */
.nav{position:sticky;top:0;z-index:10;background:rgba(246,243,236,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.logo{font-family:Fraunces,serif;font-weight:700;font-size:1.2rem;text-decoration:none;color:var(--ink);display:flex;align-items:center;gap:8px;white-space:nowrap}
.logo-mark{color:var(--accent);font-size:1.4rem}
.nav nav{display:flex;align-items:center;gap:22px}
.nav nav a{text-decoration:none;color:var(--ink);font-weight:500;font-size:.95rem}
.nav nav a.on:not(.btn){color:var(--accent)}
@media(max-width:720px){.nav nav a:not(.btn){display:none}}

/* Buttons */
.btn{display:inline-block;background:var(--accent);color:#fff!important;text-decoration:none;font-weight:600;padding:13px 22px;border-radius:var(--radius);border:0;cursor:pointer;font:600 1rem Inter,sans-serif;transition:background .15s,transform .15s}
.btn:hover{background:var(--accent-d);transform:translateY(-1px)}
.btn-sm{padding:8px 14px;font-size:.9rem}
.btn-ghost{background:transparent;color:var(--ink)!important;border:1px solid var(--ink)}
.btn-ghost:hover{background:var(--ink);color:#fff!important}
.btn-light{background:#fff;color:var(--blue)!important}
.btn-light:hover{background:var(--blue-l)}
.btn-block{display:block;width:100%;text-align:center}

/* Hero */
.hero{padding:72px 0 56px;background:
  linear-gradient(var(--line) 1px,transparent 1px) 0 0/32px 32px,
  linear-gradient(90deg,var(--line) 1px,transparent 1px) 0 0/32px 32px;background-color:var(--paper)}
.hero{background-blend-mode:normal}
.hero::before{content:none}
.hero-in{display:grid;grid-template-columns:1.2fr 1fr;gap:48px;align-items:center}
.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.8rem;font-weight:600;color:var(--accent);margin:0 0 12px}
h1 em{font-style:normal;color:var(--accent)}
.lead{font-size:1.15rem;color:var(--muted);max-width:56ch}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin:28px 0 22px}
.checks{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:8px 20px;font-size:.92rem}
.checks li::before{content:"✓ ";color:var(--accent);font-weight:700}
.plan-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px;box-shadow:var(--shadow);position:relative}
.plan{width:100%;height:auto;display:block}
.p-ground{fill:#eef2e6;stroke:#9aa88a;stroke-dasharray:6 4}
.p-house{fill:var(--blue-l);stroke:var(--blue);stroke-width:2}
.p-ext{fill:rgba(196,85,43,.15);stroke:var(--accent);stroke-width:2;stroke-dasharray:5 3}
.p-dim{stroke:var(--ink);stroke-width:1}
.p-north{stroke:var(--ink);stroke-width:1.5;fill:none}
.p-txt{font:11px Inter,sans-serif;fill:var(--ink);text-anchor:middle}
.p-acc{fill:var(--accent);font-weight:600}
.plan-tag{position:absolute;bottom:-12px;right:20px;background:var(--ink);color:#fff;font-size:.75rem;padding:4px 10px;border-radius:20px}
@media(max-width:860px){.hero-in{grid-template-columns:1fr}.hero{padding-top:48px}}

/* Sections */
.section{padding:72px 0}
.section.alt{background:var(--card);border-block:1px solid var(--line)}
.sub{color:var(--muted);margin:-4px 0 32px;max-width:65ch}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;display:flex;flex-direction:column;box-shadow:var(--shadow);transition:transform .15s,border-color .15s}
.card:hover{transform:translateY(-2px);border-color:var(--accent)}
.card p{color:var(--muted);flex:1;margin:0 0 18px}
.card-foot{display:flex;justify-content:space-between;align-items:center;border-top:1px dashed var(--line);padding-top:14px}
.price{font-weight:600;color:var(--blue)}
.link{font-weight:600;text-decoration:none;color:var(--accent)}
.two{display:grid;grid-template-columns:1.3fr 1fr;gap:48px;align-items:start}
.pieces{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:24px}
.pieces ol{margin:0;padding-left:1.3em} .pieces li{padding:3px 0}
@media(max-width:860px){.two{grid-template-columns:1fr}}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:s}
.step span{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:50%;background:var(--blue);color:#fff;font-weight:700;margin-bottom:12px}
.step p{color:var(--muted);margin:0}
@media(max-width:860px){.steps{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.steps{grid-template-columns:1fr}}
.cta-band{background:var(--blue);color:#fff;padding:48px 0}
.cta-in{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.cta-in h2{margin:0}

/* Footer */
.foot{background:var(--ink);color:#cfd6d8;padding:36px 0;font-size:.92rem}
.foot a{color:#fff}
.foot-in{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.foot .muted{color:#9aa6aa}
@media(max-width:720px){.foot-in{grid-template-columns:1fr}}

/* Form */
.page-title{font-size:clamp(1.8rem,3.5vw,2.5rem)}
.devis{display:grid;grid-template-columns:1fr 320px;gap:28px;align-items:start}
@media(max-width:900px){.devis{grid-template-columns:1fr}}
fieldset{border:1px solid var(--line);background:var(--card);border-radius:var(--radius);padding:22px 22px 10px;margin:0 0 20px;box-shadow:var(--shadow)}
legend{font-family:Fraunces,serif;font-weight:700;font-size:1.15rem;padding:0 8px;display:flex;align-items:center;gap:10px}
.num{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--accent);color:#fff;font:600 .9rem Inter,sans-serif}
.choices{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;margin-bottom:12px}
.choice input{position:absolute;opacity:0;pointer-events:none}
.choice-box{display:flex;flex-direction:column;gap:4px;height:100%;padding:14px 16px;border:1.5px solid var(--line);border-radius:var(--radius);cursor:pointer;transition:border-color .15s,background .15s}
.choice-box:hover{border-color:var(--muted)}
.choice input:checked+.choice-box{border-color:var(--accent);background:rgba(196,85,43,.06);box-shadow:0 0 0 3px rgba(196,85,43,.12)}
.choice input:focus-visible+.choice-box{outline:2px solid var(--blue);outline-offset:2px}
.choice-title{font-weight:600}
.choice-desc{font-size:.85rem;color:var(--muted);flex:1}
.choice-price{font-size:.85rem;font-weight:600;color:var(--blue)}
.opts{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:8px;margin-bottom:12px}
.opt{display:flex;align-items:center;gap:10px;padding:10px 12px;border:1px solid var(--line);border-radius:8px;cursor:pointer;font-size:.93rem}
.opt:has(input:checked){border-color:var(--accent);background:rgba(196,85,43,.05)}
.opt input{accent-color:var(--accent);width:18px;height:18px;flex:none}
.opt span{flex:1} .opt em{font-style:normal;color:var(--muted);font-size:.85rem;white-space:nowrap}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:600px){.row{grid-template-columns:1fr}}
fieldset label{display:block;font-weight:500;font-size:.92rem;margin-bottom:14px}
input[type=text],input[type=email],input[type=tel],input[type=number],input[type=date],select,textarea{
  display:block;width:100%;margin-top:6px;padding:11px 12px;border:1px solid var(--line);border-radius:8px;background:#fff;font:inherit;color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-l)}
textarea{resize:vertical}
.consent{display:flex!important;gap:10px;align-items:flex-start;font-weight:400!important;color:var(--muted)}
.consent input{margin-top:4px;accent-color:var(--accent)}
.warn{background:#fff4e0;border-left:4px solid #e0a030;padding:10px 14px;border-radius:6px;font-size:.9rem;margin:-4px 0 14px}
.alert{background:#fdecea;border:1px solid #f1b8b0;color:#8a2a1c;padding:14px 18px;border-radius:var(--radius);margin-bottom:20px}
.alert ul{margin:6px 0 0;padding-left:1.2em}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.recap{position:sticky;top:84px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.r-line{display:flex;justify-content:space-between;gap:10px;font-size:.9rem;padding:6px 0;border-bottom:1px dashed var(--line)}
.r-line em{font-style:normal;color:var(--muted);white-space:nowrap}
#r-presta{font-weight:600}
.r-total{display:flex;justify-content:space-between;align-items:baseline;margin:16px 0 4px;font-size:1.05rem}
.r-total strong{font-family:Fraunces,serif;font-size:1.5rem;color:var(--accent)}
.recap .btn{margin-top:14px}
@media(max-width:900px){.recap{position:static}}

/* Merci */
.merci{text-align:center;max-width:640px}
.merci .lead{margin:0 auto 28px}
.merci-ico{width:72px;height:72px;border-radius:50%;background:#2e7d4f;color:#fff;font-size:2rem;display:grid;place-items:center;margin:0 auto 20px}
.merci-ico.err{background:var(--accent)}

/* Envoi en arrière-plan */
.success{text-align:center;max-width:640px;margin:20px auto;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:40px 28px;box-shadow:var(--shadow)}
.success p{color:var(--muted);margin:0 0 24px}
.captcha input{max-width:140px}
button:disabled{opacity:.6;cursor:wait;transform:none}
.opt.off{opacity:.45;cursor:not-allowed}
.note{background:var(--blue-l);border-radius:6px;padding:8px 10px;color:var(--blue)}
.opt em small{display:block;font-size:.75rem;color:var(--muted)}
.opt em{text-align:right}