/* ===================================================================
   EURO GAS TRANS — Feuille de style (v2)
   Fond blanc intégral, une seule couleur d'accent, filets fins.
   Polices hébergées localement (dossier /fonts) : aucun appel externe.
   =================================================================== */

@font-face{font-family:"Inter";font-weight:400;font-style:normal;font-display:swap;src:url("../fonts/inter-400.woff") format("woff")}
@font-face{font-family:"Inter";font-weight:500;font-style:normal;font-display:swap;src:url("../fonts/inter-500.woff") format("woff")}
@font-face{font-family:"Inter";font-weight:600;font-style:normal;font-display:swap;src:url("../fonts/inter-600.woff") format("woff")}
@font-face{font-family:"Inter Display";font-weight:600;font-style:normal;font-display:swap;src:url("../fonts/inter-display-600.woff") format("woff")}

:root{
  --white:#ffffff;
  --ink:#0b1b33;          /* texte principal */
  --ink-soft:#4c5b73;     /* texte secondaire */
  --line:#e1e6ee;         /* filets */
  --blue:#0b5bd3;         /* accent unique */
  --blue-dark:#0947a6;
  --ok:#15803d;
  --err:#c62828;
  --radius:8px;
  --maxw:1120px;
  --text:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --display:"Inter Display","Inter",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:112px}
body{
  font-family:var(--text);font-size:1.0625rem;line-height:1.6;
  color:var(--ink);background:var(--white);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}

h1,h2,h3{font-family:var(--display);font-weight:600;color:var(--ink);text-wrap:balance}
h1{font-size:clamp(2.25rem,5.2vw,3.75rem);line-height:1.06;letter-spacing:-.03em}
h2{font-size:clamp(1.7rem,3.4vw,2.5rem);line-height:1.12;letter-spacing:-.025em}
h3{font-size:1.2rem;line-height:1.3;letter-spacing:-.01em}
p{text-wrap:pretty}

.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}

:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:4px}

.skip-link{
  position:absolute;left:16px;top:-60px;z-index:100;background:var(--ink);color:#fff;
  padding:.6rem 1rem;border-radius:var(--radius);
}
.skip-link:focus{top:12px}

/* ---------- Boutons et liens ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  font:600 1rem/1 var(--text);
  padding:1rem 1.6rem;border-radius:var(--radius);border:1px solid transparent;
  cursor:pointer;transition:background-color .15s ease;
}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-dark)}
.btn-small{padding:.7rem 1.1rem;font-size:.95rem}
.btn[disabled]{opacity:.6;cursor:default}

.text-link{
  color:var(--blue);font-weight:600;
  text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:.25em;
}
.text-link:hover{color:var(--blue-dark);text-decoration-thickness:2px}

/* ---------- En-tête ---------- */
.site-header{
  position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:96px}
.brand-logo{height:64px;width:auto}
.main-nav{display:flex;align-items:center;gap:2rem}
.main-nav a:not(.btn){color:var(--ink-soft);font-weight:500;font-size:.97rem}
.main-nav a:not(.btn):hover{color:var(--ink)}

.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:10px}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--ink);transition:transform .2s,opacity .2s}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- Hero ---------- */
.hero{padding:5.5rem 0 0}
.hero-inner{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:3rem;align-items:center}
.lead{font-size:1.2rem;line-height:1.55;color:var(--ink-soft);max-width:34rem;margin-top:1.5rem}
.hero-actions{display:flex;align-items:center;gap:1.75rem;flex-wrap:wrap;margin-top:2.25rem}
.hero-note{margin-top:1.5rem;font-size:.93rem;color:var(--ink-soft)}
.split-text h2 span{display:block}
.hero-visual img{width:100%;max-height:440px;object-fit:contain}

/* ---------- Sections ---------- */
.section{padding:6.5rem 0 0}
.section-head{max-width:44rem;margin-bottom:3rem}
.section-head p{color:var(--ink-soft);font-size:1.1rem;margin-top:1rem;max-width:38rem}
.section-cta{margin-top:3rem}
.footnote{margin-top:1.25rem;font-size:.88rem;color:var(--ink-soft)}

/* ---------- Produits : une fiche par ligne ---------- */
.products{border-bottom:1px solid var(--line)}
.product{
  display:grid;grid-template-columns:180px minmax(0,1fr) 300px;gap:2.5rem;align-items:center;
  padding:2.5rem 0;border-top:1px solid var(--line);
}
.product-img{display:flex;align-items:center;justify-content:center;height:190px}
.product-img img{max-height:190px;width:auto;object-fit:contain}
.product-body h3{font-size:2rem;letter-spacing:-.03em;line-height:1}
.product-pitch{font-weight:600;font-size:1.08rem;line-height:1.4;margin-top:.6rem}
.product-body p:not(.product-pitch){color:var(--ink-soft);margin-top:.6rem;max-width:34rem}
.product-body .text-link{display:inline-block;margin-top:1.1rem;font-size:.97rem}

.specs > div{
  display:flex;justify-content:space-between;gap:1.5rem;align-items:baseline;
  padding:.65rem 0;border-bottom:1px solid var(--line);font-size:.95rem;
}
.specs > div:last-child{border-bottom:0}
.specs dt{color:var(--ink-soft);white-space:nowrap}
.specs dd{font-weight:600;text-align:right;font-variant-numeric:tabular-nums}

/* ---------- Conformité ---------- */
.split{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:4rem;align-items:center}
.split-text p{color:var(--ink-soft);margin-top:1.25rem;max-width:36rem}
.split-text p + p{color:var(--ink);font-weight:600}
.photo{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:12px}

.check-list{margin-top:1.75rem;display:grid;gap:.8rem}
.check-list li{position:relative;padding-left:2rem}
.check-list li::before{
  content:"";position:absolute;left:.15rem;top:.42rem;width:.95rem;height:.5rem;
  border-left:2px solid var(--blue);border-bottom:2px solid var(--blue);transform:rotate(-45deg);
}

/* ---------- Offre : trois étapes reliées (séquence réelle, donc numérotée) ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:2.5rem;counter-reset:etape}
.steps li{counter-increment:etape;position:relative;padding-top:4.5rem}
.steps li::before{
  content:counter(etape);position:absolute;top:0;left:0;width:52px;height:52px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:var(--blue);color:#fff;font-family:var(--display);font-weight:600;font-size:1.25rem;
}
.steps li:not(:last-child)::after{
  content:"";position:absolute;top:26px;left:68px;right:calc(-2.5rem + 16px);
  border-top:2px dotted #b4c3da;
}
.steps p{color:var(--ink-soft);margin-top:.5rem;max-width:20rem}

/* ---------- Engagements ---------- */
.reasons{display:grid;grid-template-columns:1fr 1fr;gap:1.25rem}
.reasons li{
  display:flex;gap:1.25rem;align-items:flex-start;
  padding:1.75rem;border:1px solid var(--line);border-radius:14px;
}
.reason-icon{
  flex:none;width:52px;height:52px;padding:13px;border-radius:12px;background:#edf3fd;
  fill:none;stroke:var(--blue);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;
}
.reasons p{color:var(--ink-soft);margin-top:.4rem}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,.8fr);gap:4.5rem;align-items:start}
.contact-intro{color:var(--ink-soft);font-size:1.05rem;margin:1rem 0 2.25rem}

.field{display:flex;flex-direction:column;margin-bottom:1.15rem}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:1.15rem}
.field label{font-size:.93rem;font-weight:600;margin-bottom:.4rem}
.optional{font-weight:400;color:var(--ink-soft)}
.field input,.field select,.field textarea{
  width:100%;background:var(--white);color:var(--ink);
  border:1px solid #b9c2d0;border-radius:var(--radius);
  padding:.8rem .9rem;font:inherit;font-size:1rem;
}
.field input::placeholder,.field textarea::placeholder{color:#8291a7}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:2px solid var(--blue);outline-offset:0;border-color:var(--blue);
}
.field textarea{resize:vertical;min-height:7rem}

/* honeypot anti-spam : invisible pour l'humain */
.hp-field{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}

.form-status{font-weight:600;font-size:.97rem}
.form-status:not(:empty){margin-top:1rem}
.form-status.ok{color:var(--ok)}
.form-status.err{color:var(--err)}
.form-legal{margin-top:1rem;font-size:.88rem;color:var(--ink-soft)}

.contact-info{border-left:1px solid var(--line);padding-left:2.5rem;margin-top:.5rem}
.contact-list{margin-top:1.5rem;display:grid;gap:1.5rem}
.contact-list dt{font-size:.9rem;color:var(--ink-soft);margin-bottom:.15rem}
.contact-list dd{font-weight:500;line-height:1.5}
.contact-list a{color:var(--blue);font-weight:600}
.contact-list a:hover{color:var(--blue-dark);text-decoration:underline}

@media (min-width:961px){.contact-intro{white-space:nowrap}}

/* ---------- Pied de page ---------- */
.site-footer{margin-top:6.5rem;border-top:1px solid var(--line)}
.footer-inner{
  display:flex;justify-content:space-between;align-items:flex-end;gap:2rem;flex-wrap:wrap;
  padding-top:2rem;padding-bottom:2.5rem;font-size:.9rem;color:var(--ink-soft);
}
.legal-ids strong{color:var(--ink);font-weight:600}

/* ---------- Adaptation aux écrans ---------- */
@media (max-width:960px){
  .product{grid-template-columns:140px minmax(0,1fr);gap:1.5rem 2rem;align-items:start}
  .product-img{height:150px}
  .product-img img{max-height:150px}
  .specs{grid-column:2}
  .split{grid-template-columns:1fr;gap:2.5rem}
  .contact-grid{grid-template-columns:1fr;gap:3rem}
  .contact-info{border-left:0;padding-left:0;border-top:1px solid var(--line);padding-top:2rem}
}
@media (max-width:760px){
  html{scroll-padding-top:88px}
  .nav{height:76px}
  .brand-logo{height:48px}
  .nav-toggle{display:flex}
  .main-nav{
    position:absolute;left:0;right:0;top:76px;flex-direction:column;align-items:stretch;gap:0;
    background:var(--white);border-bottom:1px solid var(--line);padding:.5rem 24px 1.5rem;
    display:none;
  }
  .main-nav.open{display:flex}
  .main-nav a:not(.btn){padding:.95rem 0;border-bottom:1px solid var(--line);font-size:1.05rem}
  .main-nav .btn{margin-top:1.25rem;padding:1rem}

  .hero{padding-top:3rem}
  .hero-inner{grid-template-columns:1fr;gap:2rem}
  .hero-visual img{max-height:280px}
  .lead{font-size:1.1rem}
  .hero-actions .btn{width:100%}

  .section{padding-top:4.5rem}
  .section-head{margin-bottom:2rem}
  .product{grid-template-columns:1fr;padding:2rem 0}
  .product-img{justify-content:flex-start;height:130px}
  .product-img img{max-height:130px}
  .specs{grid-column:1}
  .steps{grid-template-columns:1fr;gap:2rem}
  .steps li{padding:0 0 0 4.25rem;min-height:52px}
  .steps li:not(:last-child)::after{
    top:60px;bottom:calc(-2rem + 8px);left:25px;right:auto;border-top:0;border-left:2px dotted #b4c3da;
  }
  .steps p{max-width:none}
  .reasons{grid-template-columns:1fr;gap:1rem}
  .reasons li{padding:1.25rem;gap:1rem}
  .reason-icon{width:44px;height:44px;padding:11px}
  .field-row{grid-template-columns:1fr;gap:0}
  .contact-form .btn{width:100%}
  .site-footer{margin-top:4.5rem}
  .footer-inner{flex-direction:column;align-items:flex-start;gap:1rem}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none !important}
}