:root{
  --paper:#F7F8FA; --surface:#FFFFFF; --line:#D9DEE5; --ink:#14273D; --text:#2B3A4A; --muted:#5D6B7A;
  --blue:#1F4E79; --tab:#2F7D63; --tab-soft:#E3F1EB; --shadow:0 1px 0 #D9DEE5, 0 8px 24px -12px rgba(20,39,61,.25);
  --serif:"Literata", Georgia, "Times New Roman", serif;
  --sans:"Public Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme:light;
  box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px); padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --paper:#0F1722; --surface:#16212F; --line:#2A3A4D; --ink:#EEF2F7; --text:#C9D3DE; --muted:#8E9DAE;
    --blue:#7FB0DE; --tab:#5CC29C; --tab-soft:#173A30; --shadow:0 1px 0 #2A3A4D, 0 8px 24px -12px rgba(0,0,0,.6);
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --paper:#0F1722; --surface:#16212F; --line:#2A3A4D; --ink:#EEF2F7; --text:#C9D3DE; --muted:#8E9DAE;
  --blue:#7FB0DE; --tab:#5CC29C; --tab-soft:#173A30; --shadow:0 1px 0 #2A3A4D, 0 8px 24px -12px rgba(0,0,0,.6);
  color-scheme:dark;
}
*,*::before,*::after{box-sizing:inherit}
html{scroll-behavior:smooth;scroll-padding-top:calc(env(safe-area-inset-top,0px) + 72px)}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}
body{margin:0;background:var(--paper);color:var(--text);font:400 1.0625rem/1.65 var(--sans)}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:var(--surface)}
img,svg{max-width:100%}
a{color:var(--blue)}
:focus-visible{outline:3px solid var(--tab);outline-offset:2px;border-radius:2px}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
h1,h2,h3{font-family:var(--serif);color:var(--ink);font-weight:650;line-height:1.2;margin:0}
h2{font-size:clamp(1.75rem,3.2vw,2.35rem);margin-bottom:12px}
h3{font-size:1.2rem;font-weight:500}
p{margin:0 0 1em;max-width:68ch}
.lead{font-size:1.15rem;color:var(--muted)}

/* En-tête */
header{position:sticky;top:env(safe-area-inset-top,0px);z-index:20;background:var(--surface);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:600;letter-spacing:.02em}
.brand svg{flex:none}
nav ul{display:flex;gap:28px;list-style:none;margin:0;padding:0}
nav a{text-decoration:none;color:var(--text);font-weight:500;font-size:.98rem}
nav a:hover{color:var(--blue)}
.menu-btn{display:none;background:none;border:1px solid var(--line);color:var(--ink);border-radius:6px;padding:8px 12px;font:inherit;cursor:pointer}
@media (max-width:820px){
  .menu-btn{display:block}
  nav{position:absolute;left:0;right:0;top:64px;background:var(--surface);border-bottom:1px solid var(--line);display:none}
  nav.open{display:block}
  nav ul{flex-direction:column;gap:0;padding:8px 24px 16px}
  nav li a{display:block;padding:12px 0;border-bottom:1px solid var(--line)}
}

/* Hero */
.hero{padding:72px 0 80px}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.hero h1{font-size:clamp(2.1rem,4.6vw,3.4rem);margin-bottom:20px;letter-spacing:-.01em}
.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.btn{display:inline-block;padding:13px 22px;border-radius:6px;font-weight:600;text-decoration:none;border:1px solid var(--blue);font-size:1rem;cursor:pointer;font-family:var(--sans)}
.btn-primary{background:var(--blue);color:var(--surface)}
.btn-primary:hover{filter:brightness(1.1)}
.btn-ghost{color:var(--blue);background:transparent}
.btn-ghost:hover{background:var(--surface)}

/* Fiche d’indexation : l’élément signature */
.fiche{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:4px 10px 10px 10px;box-shadow:var(--shadow);padding:26px 26px 20px}
.fiche::before{content:"Facture fournisseur";position:absolute;top:-30px;left:-1px;background:var(--tab);color:#fff;font-size:.82rem;font-weight:600;padding:6px 16px 8px;border-radius:8px 8px 0 0}
.fiche dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:0}
.fiche dt,.fiche dd{padding:9px 0;border-bottom:1px dashed var(--line);margin:0;font-size:.95rem}
.fiche dt{color:var(--muted);padding-right:20px}
.fiche dd{color:var(--ink);font-weight:500;text-align:right}
.fiche .ok{display:inline-block;background:var(--tab-soft);color:var(--tab);border-radius:999px;padding:1px 10px;font-weight:600}
.fiche .trace{margin:16px 0 0;font-size:.88rem;color:var(--muted)}
.fiche .trace li{margin:4px 0}
.fiche ol{padding-left:18px;margin:0}
.fiche-note{font-size:.88rem;color:var(--muted);margin-top:14px}
.stamp{animation:stamp .5s 1.2s ease-out both}
@keyframes stamp{from{opacity:0;transform:scale(1.25)}to{opacity:1;transform:none}}
@media (max-width:900px){.hero-grid{grid-template-columns:1fr}.hero{padding:48px 0 64px}.fiche{margin-top:36px}}

/* Sections */
section{padding:80px 0;border-top:1px solid var(--line)}
.section-head{margin-bottom:40px}

/* Services : liste en registre, pas de cartes */
.services{display:grid;grid-template-columns:repeat(2,1fr);gap:0 56px}
.service{padding:26px 0;border-top:1px solid var(--line)}
.service h3{margin-bottom:8px;display:flex;gap:12px;align-items:baseline}
.service h3::before{content:"";flex:none;width:10px;height:10px;background:var(--tab);border-radius:2px;transform:translateY(-2px)}
.service p{color:var(--text);margin:0 0 .6em}
.service .tools{font-size:.9rem;color:var(--muted);margin:0}
@media (max-width:760px){.services{grid-template-columns:1fr}}

/* Méthode : vraie séquence */
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:24px;counter-reset:s}
.steps li{counter-increment:s;padding-top:18px;border-top:3px solid var(--blue)}
.steps li::before{content:"Étape " counter(s);display:block;font-size:.85rem;color:var(--muted);margin-bottom:6px}
.steps h3{margin-bottom:8px}
.steps p{font-size:.97rem;margin:0}
@media (max-width:900px){.steps{grid-template-columns:repeat(2,1fr)}}
@media (max-width:520px){.steps{grid-template-columns:1fr}}

/* Réalisations */
.refs{display:grid;gap:0;border:1px solid var(--line);border-radius:10px;background:var(--surface);overflow:hidden}
.ref{display:grid;grid-template-columns:220px 1fr;gap:24px;padding:24px 28px;border-top:1px solid var(--line)}
.ref:first-child{border-top:0}
.ref .sector{color:var(--muted);font-size:.92rem}
.ref h3{margin-bottom:6px}
.ref p{margin:0;font-size:.98rem}
@media (max-width:700px){.ref{grid-template-columns:1fr;gap:6px;padding:20px}}

/* À propos */
.about{display:grid;grid-template-columns:1.2fr .8fr;gap:56px;align-items:start}
.facts{margin:0;padding:24px 26px;background:var(--surface);border:1px solid var(--line);border-radius:10px}
.facts div{padding:12px 0;border-bottom:1px solid var(--line)}
.facts div:last-child{border-bottom:0}
.facts dt{font-family:var(--serif);font-size:1.5rem;color:var(--ink);font-weight:650}
.facts dd{margin:0;color:var(--muted);font-size:.95rem}
@media (max-width:860px){.about{grid-template-columns:1fr}}

/* Contact */
.contact{display:grid;grid-template-columns:.9fr 1.1fr;gap:56px}
.coord p{margin:0 0 6px}
.coord .big{font-size:1.15rem;font-weight:600;color:var(--ink)}
form{display:grid;gap:14px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
label{display:grid;gap:6px;font-size:.92rem;font-weight:500;color:var(--ink)}
input,select,textarea{font:inherit;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:11px 12px;width:100%}
textarea{min-height:140px;resize:vertical}
input:focus,select:focus,textarea:focus{outline:2px solid var(--tab);outline-offset:0;border-color:transparent}
.form-msg{font-size:.92rem;color:var(--muted);min-height:1.4em;margin:0}
@media (max-width:860px){.contact{grid-template-columns:1fr}}
@media (max-width:520px){.row{grid-template-columns:1fr}}

/* Pied de page */
footer{border-top:1px solid var(--line);background:var(--surface);padding:32px 0;font-size:.92rem;color:var(--muted)}
.foot{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px}
footer button{background:none;border:0;color:var(--blue);font:inherit;cursor:pointer;padding:0;text-decoration:underline}
dialog{max-width:640px;width:calc(100% - 32px);border:1px solid var(--line);border-radius:10px;background:var(--surface);color:var(--text);padding:28px}
dialog::backdrop{background:rgba(10,20,30,.55)}
dialog h2{font-size:1.5rem}
dialog h3{margin:18px 0 6px;font-size:1.05rem}
dialog p{font-size:.95rem;margin:0 0 .5em}