/* CJVRS – feuille de style commune */
:root{
  --paper:#eeebe3;        /* papier calque */
  --paper-2:#e7e3d9;
  --sheet:#f6f4ef;        /* jamais blanc pur */
  --blue:#1f4f82;         /* trait de plan / bleu d'architecte */
  --blue-2:#2b6299;
  --blue-dark:#173d66;
  --accent:#f28c28;
  --ink:#1b2a3a;
  --muted:#5a6675;
  --trait:rgba(31,79,130,.55);
  --mono:"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{font-family:"Helvetica Neue",Inter,"Segoe UI",system-ui,Roboto,Arial,sans-serif;color:var(--ink);background:var(--paper);line-height:1.6;-webkit-font-smoothing:antialiased}
svg{display:block}
a{color:inherit}
.container{width:min(1180px,100% - 40px);margin-inline:auto}

/* Papier millimétré bleu (petit + grand carreau), dans tous les blocs */
.paper,.blueprint{background-size:100px 100px,100px 100px,20px 20px,20px 20px;background-position:-1px -1px}
.paper{
  background-color:var(--paper);
  background-image:
    linear-gradient(rgba(31,79,130,.11) 1px,transparent 1px),
    linear-gradient(90deg,rgba(31,79,130,.11) 1px,transparent 1px),
    linear-gradient(rgba(31,79,130,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(31,79,130,.045) 1px,transparent 1px);
}
.paper.alt{background-color:var(--paper-2)}
.blueprint{
  color:#fff;background-color:var(--blue);
  background-image:
    linear-gradient(rgba(255,255,255,.13) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.13) 1px,transparent 1px),
    linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
}

h1,h2,h3{line-height:1.12;letter-spacing:-.02em;color:var(--ink)}
h2{font-size:clamp(1.9rem,3.6vw,2.8rem);font-weight:700;margin-bottom:16px}
h3{font-size:1.15rem;font-weight:700}
.blueprint h2{color:#fff}
.lead{font-size:1.08rem;color:var(--muted);max-width:640px}
.blueprint .lead{color:rgba(255,255,255,.82)}
section{position:relative;padding:110px 0}

/* Repère de section façon plan : bulle d'axe + libellé */
.repere{display:flex;align-items:center;gap:12px;margin-bottom:18px;font-family:var(--mono);font-size:.76rem;letter-spacing:.14em;text-transform:uppercase;color:var(--blue)}
.repere::after{content:"";width:48px;border-top:1.5px dashed currentColor;opacity:.6}
.blueprint .repere{color:#fff}

/* Boutons */
.btn{display:inline-flex;align-items:center;gap:12px;padding:15px 24px;font-weight:700;font-size:.97rem;text-decoration:none;border:1.5px solid transparent;transition:background .2s,color .2s,border-color .2s,gap .2s}
.btn:hover{gap:18px}
.btn-blue{background:var(--blue);color:#fff}
.btn-blue:hover{background:var(--blue-dark)}
.btn-line{border-color:var(--blue);color:var(--blue)}
.btn-line:hover{background:var(--blue);color:#fff}

/* Header (bleu d'architecte, logo blanc) */
header{position:fixed;inset:0 0 auto 0;z-index:50;background:rgba(23,61,102,.97);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);box-shadow:0 1px 0 rgba(0,0,0,.08)}
.nav{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{display:flex;align-items:center;gap:16px;text-decoration:none;color:#fff;font-family:Optima,"Optima nova",Candara,"Segoe UI",sans-serif}
.brand b{font-size:1.55rem;font-weight:600;letter-spacing:.16em;color:#fff}
.brand small{font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:#fff;padding-left:16px;border-left:1px solid rgba(255,255,255,.45)}
.nav-cta{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);background:var(--accent);font-weight:700;font-size:.92rem;padding:10px 20px;transition:background .2s}
.nav-cta:hover{background:#fff}
.nav-cta.mobile{display:none;width:44px;height:44px;padding:0;justify-content:center}
.nav-cta svg{width:20px;height:20px}

/* Hero */
.hero{min-height:100vh;display:flex;flex-direction:column;padding:0;overflow:hidden}
.hero-main{flex:1;display:flex;align-items:center;padding:130px 0 70px}
.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center}
.hero h1{font-size:clamp(2.3rem,5vw,4rem);font-weight:800;margin-bottom:24px;color:var(--ink)}
.hero h1 em{font-style:normal;color:var(--blue);background:linear-gradient(transparent 62%,var(--accent) 62%,var(--accent) 90%,transparent 90%);padding:0 .08em}
.hero p.intro{font-size:1.1rem;color:var(--muted);max-width:560px;margin-bottom:36px}
.hero .actions{display:flex;flex-wrap:wrap;gap:14px}

/* Dessin technique animé */
.drawing{position:relative}

/* Cartouche sous le dessin */
.cartouche{position:relative;border:1.5px solid var(--blue);background:rgba(246,244,239,.86);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}
.cartouche h3,.cartouche .ct-title{font-size:1rem;letter-spacing:-.01em;line-height:1.3;margin:0;padding:14px 16px 8px;color:var(--ink)}
.cartouche ul{list-style:none}
.cartouche li{display:grid;grid-template-columns:42px 1fr;border-top:1px solid rgba(31,79,130,.22);font-size:.94rem}
.cartouche li b{font-family:var(--mono);font-weight:400;font-size:.74rem;color:var(--blue);display:grid;place-items:center;border-right:1px solid rgba(31,79,130,.22)}
.cartouche li span{padding:10px 14px}

/* Bandeau dans le même bloc */
.strip{border-top:1.5px solid var(--blue);border-bottom:1px solid rgba(31,79,130,.25);padding:18px 0}
.strip .container{display:flex;flex-wrap:wrap;gap:8px 0;justify-content:space-between}
.strip span{font-family:var(--mono);font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;color:var(--blue);display:inline-flex;align-items:center;gap:10px;padding-right:18px}
.strip span::before{content:"";width:9px;height:9px;border:1.5px solid var(--blue);border-radius:50%;background:var(--accent)}

/* Services : fiches techniques avec repères d'angle */
.head-row{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:end;margin-bottom:56px}
.sheets{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.sheet{background:var(--sheet);border:1.5px solid var(--blue);padding:34px 30px 30px;position:relative;transition:transform .3s,box-shadow .3s}
.sheet:hover{transform:translate(-4px,-4px);box-shadow:8px 8px 0 rgba(31,79,130,.18)}
.sheet .mk,.cartouche .mk{position:absolute;width:16px;height:16px;border-color:var(--blue);border-style:solid;border-width:0}
.sheet .mk.tl,.cartouche .mk.tl{top:-9px;left:-9px;border-top-width:1.5px;border-left-width:1.5px}
.sheet .mk.br,.cartouche .mk.br{bottom:-9px;right:-9px;border-bottom-width:1.5px;border-right-width:1.5px}
.sheet-head{display:flex;align-items:center;gap:16px;margin-bottom:18px}
.sq{flex:none;width:52px;height:52px;border:1.5px solid var(--blue);display:grid;place-items:center;color:var(--blue);background:var(--paper);transition:background .3s,color .3s}
.sheet:hover .sq{background:var(--blue);color:#fff}
.sq svg{width:26px;height:26px}
.sheet p{color:var(--muted);margin-bottom:20px}
.sheet ul{list-style:none;border-top:1px dashed rgba(31,79,130,.4)}
.sheet li{padding:10px 0 10px 24px;border-bottom:1px dashed rgba(31,79,130,.4);position:relative;font-size:.94rem}
.sheet li::before{content:"";position:absolute;left:0;top:50%;width:10px;height:10px;transform:translateY(-50%) rotate(45deg);border:1.5px solid var(--blue);background:var(--accent);width:7px;height:7px}

/* Méthode : chaîne de cotes */
.chain{display:grid;grid-template-columns:repeat(5,1fr);position:relative}
.chain::before{content:"";position:absolute;left:0;right:0;top:104px;border-top:1.5px solid var(--blue)}
.chain .st{position:relative;padding:0 14px;text-align:center}
.chain .st::before{content:"";position:absolute;left:0;top:92px;height:24px;border-left:1.5px solid var(--blue)}
.chain .st:last-child::after{content:"";position:absolute;right:0;top:92px;height:24px;border-left:1.5px solid var(--blue)}
.chain .st .tick{position:absolute;left:-6px;top:98px;width:12px;height:12px;border-top:1.5px solid var(--blue);transform:rotate(-45deg)}
.chain .bubble{width:70px;height:70px;margin:0 auto 64px;border:1.5px solid var(--blue);border-radius:50%;display:grid;place-items:center;color:var(--blue);background:var(--sheet);transition:background .3s,color .3s,transform .3s;position:relative}
.chain .bubble::after{content:"";position:absolute;top:100%;left:50%;height:34px;margin-left:-.75px;border-left:1.5px dashed var(--blue);opacity:.6}
.chain .bubble svg{width:28px;height:28px}
.chain .st:hover .bubble{background:var(--blue);color:#fff;transform:translateY(-4px)}
.chain .lbl{display:inline-block;font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;color:var(--blue);background:var(--paper-2);padding:0 8px;position:relative;top:-11px;margin-bottom:12px}
.chain h3{margin-bottom:6px}
.chain p{color:var(--muted);font-size:.92rem}

/* Contact sur calque bleu */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.contact h2 .y{color:var(--accent)}
.rows{display:grid;gap:16px}
.rows a,.rows div{display:grid;grid-template-columns:52px 1fr auto;align-items:center;gap:18px;padding:16px 20px;text-decoration:none;border:1.5px solid rgba(255,255,255,.45);background:rgba(255,255,255,.08);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);transition:border-color .25s,background .25s}
.rows a:hover{border-color:var(--accent);background:rgba(255,255,255,.14)}
.rows .ic{width:52px;height:52px;border:1.5px solid #fff;border-radius:50%;color:#fff;display:grid;place-items:center}
.rows .ic svg{width:22px;height:22px}
.rows small{display:block;font-family:var(--mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:rgba(255,255,255,.7)}
.rows strong{color:#fff;font-size:1.02rem;word-break:break-word}
.rows .arrow{color:var(--accent);font-size:1.3rem;transition:transform .25s}
.rows a:hover .arrow{transform:translateX(5px)}
.rows div .arrow{visibility:hidden}

/* Footer : cartouche de bas de plan */
footer{background-color:var(--blue-dark)!important;border-top:1px solid rgba(255,255,255,.18)}
footer .container{display:grid;grid-template-columns:auto 1fr auto;border-left:1px solid rgba(255,255,255,.22);border-right:1px solid rgba(255,255,255,.22)}
footer .cell{padding:20px 24px;border-left:1px solid rgba(255,255,255,.22);font-size:.88rem;color:rgba(255,255,255,.78)}
footer .cell:first-child{border-left:0}
footer .cell small{display:block;font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:rgba(255,255,255,.55);margin-bottom:4px}
footer .logo{font-family:Optima,"Optima nova",Candara,"Segoe UI",sans-serif;color:#fff;font-size:1.2rem;letter-spacing:.16em}
footer a{text-decoration:none}footer a:hover{color:var(--accent)}

.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
.d1{transition-delay:.1s}.d2{transition-delay:.2s}.d3{transition-delay:.3s}

@media (max-width:960px){
  section{padding:80px 0}
  .hero-inner,.head-row,.contact-grid{grid-template-columns:1fr}
  .head-row{gap:8px}
  .sheets{grid-template-columns:1fr;gap:34px}
  .chain{grid-template-columns:1fr;gap:26px}
  .chain::before{left:35px;right:auto;top:0;bottom:0;border-top:0;border-left:1.5px solid var(--blue)}
  .chain .st{display:grid;grid-template-columns:70px 1fr;gap:0 22px;text-align:left;padding:0}
  .chain .st::before,.chain .st:last-child::after,.chain .st .tick,.chain .lbl,.chain .bubble::after{display:none}
  .chain .bubble{margin:0;grid-row:span 2}
  .brand small{display:none}
  .nav-cta.desktop{display:none}
  .nav-cta.mobile{display:inline-flex}
  .strip .container{justify-content:flex-start}
  footer .container{grid-template-columns:1fr}
  footer .cell{border-left:0;border-top:1px solid rgba(255,255,255,.22)}
  footer .cell:first-child{border-top:0}
}
@media (max-width:560px){
  .hero-main{padding-top:104px}
  .rows a,.rows div{grid-template-columns:46px 1fr;padding:14px 16px}
  .rows .ic{width:46px;height:46px}
  .rows .arrow{display:none}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.reveal{opacity:1;transform:none}html{scroll-behavior:auto}}

/* ---- Lien d'évitement (accessibilité) ---- */
.skip{position:absolute;left:-999px;top:8px;z-index:100;background:var(--accent);color:var(--ink);padding:8px 14px;font-weight:700}
.skip:focus{left:8px}
footer .legal{display:block;margin-top:4px}

/* ---- Pages intérieures (mentions légales, 404) ---- */
.page{padding:140px 0 100px}
.page h1{font-size:clamp(2rem,4.4vw,3.2rem);font-weight:800;margin-bottom:18px}
.doc{max-width:820px;background:var(--sheet);border:1.5px solid var(--blue);padding:44px 48px;position:relative;margin-top:40px}
.doc .mk{position:absolute;width:16px;height:16px;border-color:var(--blue);border-style:solid;border-width:0}
.doc .mk.tl{top:-9px;left:-9px;border-top-width:1.5px;border-left-width:1.5px}
.doc .mk.br{bottom:-9px;right:-9px;border-bottom-width:1.5px;border-right-width:1.5px}
.doc h2{font-size:1.45rem;margin:38px 0 12px;padding-top:26px;border-top:1px dashed rgba(31,79,130,.4)}
.doc h2:first-of-type{margin-top:0;padding-top:0;border-top:0}
.doc h3{font-size:1.05rem;margin:22px 0 6px;color:var(--blue)}
.doc p,.doc li{color:#34404d;margin-bottom:10px}
.doc ul{padding-left:20px;margin-bottom:12px}
.doc a{color:var(--blue)}
.doc dl{display:grid;grid-template-columns:210px 1fr;border-top:1px solid rgba(31,79,130,.22);margin-bottom:8px}
.doc dt,.doc dd{padding:10px 0;border-bottom:1px solid rgba(31,79,130,.22)}
.doc dt{font-family:var(--mono);font-size:.74rem;letter-spacing:.08em;text-transform:uppercase;color:var(--blue);padding-right:18px;padding-top:13px}
.todo{background:var(--accent);color:var(--ink);padding:1px 6px;font-weight:700}
.updated{font-family:var(--mono);font-size:.76rem;letter-spacing:.08em;color:var(--muted);text-transform:uppercase}
.err{min-height:100vh;display:flex;align-items:center}
.err .code{font-family:var(--mono);font-size:clamp(5rem,16vw,10rem);line-height:1;color:var(--blue);letter-spacing:.04em;display:flex;align-items:center;gap:.25em}
.err .code span{width:.9em;height:.9em;border:3px dashed var(--accent);border-radius:50%;display:inline-block}
.err .actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
@media (max-width:640px){.doc{padding:30px 22px}.doc dl{grid-template-columns:1fr}.doc dt{border-bottom:0;padding-bottom:0}.page{padding-top:110px}}