:root{
  --ink:#16201c; --ink-2:#3d4a44; --muted:#66736d;
  --paper:#fbf8f1; --card:#ffffff; --line:#e6e0d3; --soft:#f3eee3;
  --brand:#0e5c4a; --brand-2:#0a4638; --brand-soft:#e3efe9;
  --accent:#c9861a; --accent-soft:#fbefd9;
  --danger:#a8321f; --danger-soft:#fbe7e3; --ok:#1f7a4d;
  --radius:14px; --shadow:0 1px 2px rgba(22,32,28,.06),0 8px 24px rgba(22,32,28,.06);
  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
  --sans:ui-sans-serif,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,monospace;
  color-scheme:light;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.6 var(--sans);text-rendering:optimizeLegibility}
img,svg{max-width:100%;height:auto}
a{color:var(--brand);text-underline-offset:3px}
a:hover{color:var(--brand-2)}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:4px}
.skip{position:absolute;left:-9999px}.skip:focus{left:16px;top:8px;background:#fff;padding:8px 12px;z-index:10}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.narrow{max-width:760px}

/* En-tête */
.top{border-bottom:1px solid var(--line);background:rgba(251,248,241,.92);backdrop-filter:saturate(1.4) blur(8px);position:sticky;top:0;z-index:5}
.top .wrap{display:flex;align-items:center;justify-content:space-between;height:62px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font:600 21px/1 var(--serif);color:var(--ink);text-decoration:none;letter-spacing:-.01em}
.logo svg{width:28px;height:28px}
.nav{display:flex;gap:4px}
.nav a{color:var(--ink-2);text-decoration:none;font-size:15px;padding:8px 10px;border-radius:8px}
.nav a:hover,.nav a[aria-current=page]{background:var(--soft);color:var(--ink)}
.nav .cta{background:var(--brand);color:#fff}.nav .cta:hover{background:var(--brand-2);color:#fff}
.menu-btn{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:8px 10px;font:inherit;font-size:15px;color:var(--ink)}
@media (max-width:820px){
  .menu-btn{display:block}
  .nav{display:none;position:absolute;top:62px;left:0;right:0;background:var(--paper);border-bottom:1px solid var(--line);flex-direction:column;padding:8px 20px 16px}
  .nav.open{display:flex}
  .nav a{padding:12px 8px;font-size:17px}
}

/* Typo */
h1,h2,h3{font-family:var(--serif);font-weight:600;letter-spacing:-.015em;line-height:1.15;color:var(--ink)}
h1{font-size:clamp(32px,5.4vw,52px);margin:0 0 14px}
h2{font-size:clamp(24px,3.4vw,32px);margin:48px 0 12px}
h3{font-size:20px;margin:28px 0 8px}
.lede{font-size:clamp(18px,2.2vw,21px);color:var(--ink-2);max-width:640px}
.eyebrow{font:600 13px/1 var(--sans);letter-spacing:.08em;text-transform:uppercase;color:var(--brand);margin:0 0 14px}
.muted{color:var(--muted)} small,.small{font-size:14px}
.prose p,.prose li{max-width:68ch}
.prose ul,.prose ol{padding-left:1.2em}
code{font-family:var(--mono);font-size:.92em;background:var(--soft);padding:1px 5px;border-radius:5px}

/* Héro */
.hero{padding:56px 0 36px}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
@media (max-width:900px){.hero-grid{grid-template-columns:1fr}.hero{padding:36px 0 20px}}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 20px;border-radius:12px;border:1px solid transparent;background:var(--brand);color:#fff;font:600 16px/1 var(--sans);text-decoration:none;cursor:pointer}
.btn:hover{background:var(--brand-2);color:#fff}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn.ghost:hover{background:var(--soft);color:var(--ink)}
.btn.small{min-height:38px;padding:0 14px;font-size:14px}
.btn[disabled]{opacity:.55;cursor:not-allowed}

/* Liste d'outils (pas une grille de cartes identiques) */
.toollist{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.toollist li{border-bottom:1px solid var(--line)}
.toollist a{display:grid;grid-template-columns:44px 1fr auto;gap:16px;align-items:center;padding:20px 4px;text-decoration:none;color:var(--ink)}
.toollist a:hover{background:linear-gradient(90deg,var(--soft),transparent)}
.toollist .n{font:600 15px var(--mono);color:var(--accent)}
.toollist strong{display:block;font:600 19px/1.3 var(--serif)}
.toollist span.d{color:var(--muted);font-size:15px}
.toollist .arr{color:var(--brand);font-size:22px}

/* Panneau calculateur */
.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}
@media (max-width:560px){.panel{padding:18px;border-radius:12px}}
.tool{display:grid;grid-template-columns:1fr 1fr;gap:28px;margin:28px 0}
@media (max-width:820px){.tool{grid-template-columns:1fr}}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}
.field label{font-weight:600;font-size:15px}
.field .hint{font-size:13.5px;color:var(--muted)}
input,select,textarea{font:inherit;font-size:17px;color:var(--ink);background:#fff;border:1px solid #cfc7b6;border-radius:10px;padding:11px 12px;min-height:46px;width:100%}
input:focus,select:focus,textarea:focus{border-color:var(--brand);outline:3px solid var(--brand-soft);outline-offset:0}
input[aria-invalid=true]{border-color:var(--danger);background:var(--danger-soft)}
.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:420px){.row{grid-template-columns:1fr}}
.seg{display:inline-flex;background:var(--soft);border-radius:10px;padding:4px;gap:4px;margin-bottom:16px;flex-wrap:wrap}
.seg button{border:0;background:transparent;font:600 15px var(--sans);padding:10px 14px;border-radius:8px;color:var(--ink-2);cursor:pointer;min-height:42px}
.seg button[aria-pressed=true]{background:#fff;color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.08)}
.check{display:flex;gap:10px;align-items:flex-start;font-size:15px;margin-bottom:14px}
.check input{width:20px;height:20px;min-height:0;margin-top:3px;accent-color:var(--brand)}

.result{background:var(--brand-soft);border-radius:var(--radius);padding:22px}
.result h2,.result h3{margin-top:0}
.kv{display:flex;justify-content:space-between;gap:16px;padding:9px 0;border-bottom:1px dashed rgba(14,92,74,.25);font-variant-numeric:tabular-nums}
.kv:last-child{border-bottom:0}
.kv.big{font-size:22px;font-weight:700;border-bottom:0;padding-top:14px}
.big-num{font:700 clamp(34px,6vw,48px)/1.05 var(--serif);color:var(--brand-2);font-variant-numeric:tabular-nums;margin:4px 0 6px}
.err{color:var(--danger);font-size:14.5px;min-height:1.2em;margin:4px 0 0}
.note{background:var(--accent-soft);border-left:4px solid var(--accent);padding:14px 16px;border-radius:8px;font-size:15px;margin:20px 0}
.note.danger{background:var(--danger-soft);border-color:var(--danger)}
.note.ok{background:var(--brand-soft);border-color:var(--ok)}
.sources{font-size:14px;color:var(--muted);border-top:1px solid var(--line);margin-top:36px;padding-top:16px}
.sources ul{padding-left:1.1em}

/* Facture */
.inv-lines{width:100%;border-collapse:collapse;margin:8px 0 12px}
.inv-lines th{text-align:left;font-size:13px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);padding:6px 4px}
.inv-lines td{padding:4px}
.inv-lines td:nth-child(2),.inv-lines td:nth-child(3){width:110px}
.inv-lines td:last-child{width:44px}
.inv-lines input{min-height:42px;padding:8px 10px;font-size:16px}
.icon-btn{border:1px solid var(--line);background:#fff;border-radius:8px;width:40px;height:42px;cursor:pointer;font-size:18px;color:var(--muted)}
@media (max-width:620px){
  .inv-lines thead{display:none}
  .inv-lines tr{display:grid;grid-template-columns:1fr 1fr 44px;gap:6px;padding:10px 0;border-bottom:1px solid var(--line)}
  .inv-lines td:first-child{grid-column:1/-1}
  .inv-lines td:nth-child(2),.inv-lines td:nth-child(3){width:auto}
}
.invoice-doc{background:#fff;border:1px solid var(--line);border-radius:10px;padding:32px;font-size:14.5px;color:#111}
.invoice-doc h2{margin:0;font-size:26px}
.invoice-doc table{width:100%;border-collapse:collapse;margin:18px 0}
.invoice-doc th,.invoice-doc td{padding:8px 6px;border-bottom:1px solid #e5e5e5;text-align:left;vertical-align:top}
.invoice-doc td.r,.invoice-doc th.r{text-align:right;font-variant-numeric:tabular-nums}
.inv-head{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
.inv-parties{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:20px}
@media (max-width:560px){.invoice-doc{padding:18px}.inv-parties{grid-template-columns:1fr}}
.req{list-style:none;padding:0;margin:8px 0}
.req li{padding:6px 0 6px 28px;position:relative;font-size:15px}
.req li::before{content:"";position:absolute;left:0;top:10px;width:16px;height:16px;border-radius:50%;border:2px solid #b9b2a2}
.req li.done::before{background:var(--ok);border-color:var(--ok)}
.req li.miss{color:var(--danger)}

/* Offre */
.offer{display:grid;grid-template-columns:1.2fr .8fr;gap:32px;align-items:start}
@media (max-width:860px){.offer{grid-template-columns:1fr}}
.price{font:700 46px/1 var(--serif)}
.price small{font:500 16px var(--sans);color:var(--muted)}
.ticks{list-style:none;padding:0}
.ticks li{padding:7px 0 7px 30px;position:relative}
.ticks li::before{content:"✓";position:absolute;left:4px;color:var(--ok);font-weight:700}
.faq details{border-bottom:1px solid var(--line);padding:14px 0}
.faq summary{cursor:pointer;font-weight:600;font-size:17px}
.faq details p{margin:10px 0 0;color:var(--ink-2)}
.band{background:var(--brand);color:#eaf3ef;border-radius:18px;padding:32px;margin:48px 0}
.band h2{color:#fff;margin-top:0}
.band a.btn{background:#fff;color:var(--brand-2)}

/* Pied */
.foot{border-top:1px solid var(--line);margin-top:64px;padding:32px 0 48px;font-size:14.5px;color:var(--muted)}
.foot .cols{display:flex;flex-wrap:wrap;justify-content:space-between;gap:24px}
.foot a{color:var(--ink-2)}
.foot ul{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:6px 18px}
.crumbs{font-size:14px;color:var(--muted);margin:22px 0 0}
.crumbs a{color:var(--muted)}

@media print{
  body{background:#fff}
  .top,.foot,.no-print,.crumbs,.sources,.note{display:none!important}
  .wrap{max-width:none;padding:0}
  .invoice-doc{border:0;padding:0}
  .tool{display:block;margin:0}
}
@media (prefers-reduced-motion:no-preference){.btn,.toollist a{transition:background .15s}}
.foot-name{color:var(--ink)}
.tight{padding-bottom:0}.m0{margin:0}.mt0{margin-top:0}.right{text-align:right}
.demo{margin:48px 0}
.demo figure{margin:24px 0;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:12px;box-shadow:var(--shadow)}
.demo img{display:block;width:100%;height:auto;border-radius:8px}
.demo figcaption{font-size:15px;color:var(--muted);padding:10px 4px 2px}