/* ============================================================
   Be4.archi — Charte graphique web
   Couleurs extraites des logos officiels
   ============================================================ */
:root{
  --navy:#0E2C49;        /* bleu nuit principal (texte/structure) */
  --navy-deep:#08203A;   /* fond foncé */
  --blue:#1C7FC4;        /* bleu vif accent */
  --blue-bright:#2B9BE0; /* surbrillance */
  --steel:#6E7B86;       /* gris acier */
  --steel-light:#A9B4BD;
  --paper:#F4F6F8;       /* fond clair */
  --paper-2:#E9EDF1;
  --white:#FFFFFF;
  --ink:#0E2C49;
  --line:rgba(14,44,73,.12);

  --maxw:1180px;
  --r:14px;
  --shadow:0 18px 50px -22px rgba(8,32,58,.45);
  --shadow-sm:0 8px 24px -14px rgba(8,32,58,.4);

  --f-display:'Sora',sans-serif;
  --f-body:'Mulish',-apple-system,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--f-body);
  color:var(--ink);
  background:var(--white);
  line-height:1.65;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

h1,h2,h3,h4{font-family:var(--f-display);font-weight:700;line-height:1.08;letter-spacing:-.02em;color:var(--navy)}
h1{font-size:clamp(2.4rem,6vw,4.6rem)}
h2{font-size:clamp(1.9rem,4vw,3rem)}
h3{font-size:clamp(1.3rem,2.4vw,1.7rem)}
p{color:#36506A}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}
.eyebrow{
  font-family:var(--f-display);font-weight:600;font-size:.78rem;
  letter-spacing:.22em;text-transform:uppercase;color:var(--blue);
  display:inline-flex;align-items:center;gap:10px;
}
.eyebrow::before{content:"";width:30px;height:2px;background:var(--blue)}

/* ---------- Boutons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--f-display);font-weight:600;font-size:.95rem;
  padding:15px 28px;border-radius:50px;cursor:pointer;border:none;
  transition:transform .25s,box-shadow .25s,background .25s;
}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 10px 24px -10px rgba(28,127,196,.7)}
.btn-primary:hover{background:var(--navy);transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--navy);border:1.5px solid var(--line)}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue)}
.btn-light{background:#fff;color:var(--navy)}
.btn-light:hover{transform:translateY(-2px);box-shadow:var(--shadow-sm)}
.btn .arr{transition:transform .25s}
.btn:hover .arr{transform:translateX(4px)}

/* ---------- Header ---------- */
header.site{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:100;
  height:100px;
  background:#fff;
  box-shadow:0 1px 0 var(--line);
}

header.site .nav{
  height:100px;
}

header.site.scrolled{box-shadow:0 6px 24px -16px rgba(8,32,58,.4)}
.nav{display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:12px;font-family:var(--f-display);font-weight:800;font-size:1.55rem;color:var(--navy);letter-spacing:-.01em;line-height:1;position:relative}
.brand{
  height:100px;
  display:flex;
  align-items:center;
}

.brand .picto-wrap{
  height:100px;
  display:flex;
  align-items:center;
}

.brand img{
  height:95px;
  width:auto;
  margin:0;
  display:block;
}
.brand .word .four{color:var(--blue)}
.brand .word .dom{font-weight:600;font-size:.62em;color:var(--steel);letter-spacing:.02em}
.brand .picto-white{display:none}
.brand .picto-color{display:block}
.brand .tag{color:var(--steel);font-weight:600;font-size:.95rem}
.menu{display:flex;gap:32px;align-items:center}
.menu a{font-family:var(--f-display);font-weight:600;font-size:.95rem;color:var(--navy);position:relative;padding:4px 0}
.nav-cta{padding:14px 26px;font-size:.92rem;white-space:nowrap}
.menu a{font-family:var(--f-display);font-weight:600;font-size:.95rem;color:var(--navy);position:relative;padding:4px 0}
.menu a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--blue);transition:width .3s}
.menu a:hover::after,.menu a.active::after{width:100%}
.menu a.active{color:var(--blue)}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.burger span{width:26px;height:2px;background:var(--navy);transition:.3s}

/* ---------- Hero ---------- */
.hero{
  position:relative;min-height:100vh;display:flex;align-items:center;
  background:linear-gradient(120deg,var(--navy-deep) 0%,var(--navy) 55%,#103A60 100%);
  color:#fff;overflow:hidden;
}
.hero .bp{
  position:absolute;inset:0;
  background:url('img/hero_blueprint.jpg') center/cover;
  opacity:.18;mix-blend-mode:luminosity;
}
.hero::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 70% 40%,rgba(28,127,196,.35),transparent 60%)}
.hero .wrap{
  position:relative;
  z-index:2;
  padding-top:150px;
  padding-bottom:80px;
}
.hero h1{color:#fff;max-width:14ch}
.hero h1 .hl{color:var(--blue-bright)}
.hero .lead{color:#C6D6E6;font-size:1.25rem;max-width:52ch;margin:26px 0 36px}
.hero .subhead{font-family:var(--f-display);font-weight:600;font-size:clamp(1.15rem,2vw,1.5rem);color:var(--blue-bright);margin-top:18px}
.hero-link{display:inline-flex;align-items:center;gap:8px;margin-top:22px;font-family:var(--f-display);font-weight:600;font-size:1rem;color:#fff;border-bottom:1.5px solid rgba(255,255,255,.35);padding-bottom:3px;transition:gap .25s,border-color .25s}
.hero-link:hover{gap:14px;border-color:var(--blue-bright)}
.hero-link .arr{transition:transform .25s}
.hero-link:hover .arr{transform:translateX(4px)}
.hero .eyebrow{color:var(--blue-bright)}
.hero .eyebrow::before{background:var(--blue-bright)}
.hero-cta{display:flex;gap:16px;flex-wrap:wrap}
.hero-foot{position:absolute;bottom:30px;left:0;right:0;z-index:2}
.hero-foot .wrap{display:flex;gap:40px;flex-wrap:wrap;padding-top:0;padding-bottom:0}
.hero-foot .kpi{display:flex;flex-direction:column}
.hero-foot .kpi b{font-family:var(--f-display);font-size:1.5rem;color:#fff}
.hero-foot .kpi span{color:var(--steel-light);font-size:.85rem}

/* reveal */
/* reveal : caché uniquement si JS actif (classe .js sur html) */
.js .reveal{opacity:0;transform:translateY(28px);transition:opacity .7s,transform .7s}
.js .reveal.in{opacity:1;transform:none}

/* ---------- Sections ---------- */
section{padding:clamp(70px,9vw,130px) 0}
.section-head{max-width:640px;margin-bottom:56px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head.center .eyebrow{justify-content:center}
.section-head p{margin-top:18px;font-size:1.1rem}

.bg-paper{background:var(--paper)}
.bg-navy{background:var(--navy-deep);color:#fff}
.bg-navy h2,.bg-navy h3{color:#fff}
.bg-navy p{color:#B9CADA}

/* ---------- Marchés : cartes-image look magazine ---------- */
.market-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.market{position:relative;border-radius:var(--r);overflow:hidden;aspect-ratio:3/4;box-shadow:var(--shadow-sm);transition:transform .4s,box-shadow .4s}
.market:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.market img{width:100%;height:100%;object-fit:cover;transition:transform .7s}
.market:hover img{transform:scale(1.05)}
.market .ov{position:absolute;inset:0;background:linear-gradient(180deg,rgba(8,32,58,.05) 30%,rgba(8,32,58,.55) 62%,rgba(8,32,58,.92));display:flex;flex-direction:column;justify-content:flex-end;padding:30px}
.market .mk-ic{position:absolute;top:22px;left:22px;width:42px;height:42px;border-radius:10px;background:rgba(255,255,255,.16);backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.3);display:grid;place-items:center}
.market .mk-ic svg{width:20px;height:20px;stroke:#fff;fill:none;stroke-width:1.5}
.market h3{color:#fff;font-size:1.45rem;margin-bottom:8px}
.market p{color:rgba(255,255,255,.82);font-size:.93rem;line-height:1.55}

/* picto fin inline (titres) */
.ic-line{display:inline-grid;place-items:center;width:34px;height:34px;border-radius:9px;border:1.5px solid var(--line);vertical-align:middle;margin-right:4px}
.ic-line svg{width:18px;height:18px;stroke:var(--blue);fill:none;stroke-width:1.5}

/* ---------- Bande image pleine largeur ---------- */
.fullband{position:relative;min-height:62vh;display:flex;align-items:center;color:#fff;overflow:hidden}
.fullband img.bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.fullband .scrim{position:absolute;inset:0;background:linear-gradient(90deg,rgba(8,32,58,.88) 0%,rgba(8,32,58,.62) 45%,rgba(8,32,58,.15) 100%)}
.fullband .wrap{position:relative;z-index:2}
.fullband h2{color:#fff;max-width:18ch}
.fullband p{color:#D2E0EC;max-width:46ch;margin-top:18px;font-size:1.12rem}
.fullband .eyebrow{color:var(--blue-bright)}
.fullband .eyebrow::before{background:var(--blue-bright)}

/* ---------- Cartes bénéfices épurées ---------- */
.benefit-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.benefit{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:32px 28px;transition:transform .35s,box-shadow .35s,border-color .35s}
.benefit:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:transparent}
.benefit .bic{width:40px;height:40px;border-radius:10px;border:1.5px solid var(--line);display:grid;place-items:center;margin-bottom:20px}
.benefit .bic svg{width:20px;height:20px;stroke:var(--blue);fill:none;stroke-width:1.5}
.benefit h3{font-size:1.15rem;margin-bottom:8px}
.benefit p{font-size:.95rem}

/* ---------- Faisabilité split ---------- */
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:60px;align-items:center}
.split.rev{direction:rtl}.split.rev>*{direction:ltr}
.split img{border-radius:var(--r);box-shadow:var(--shadow)}
.ticklist{list-style:none;margin-top:24px;display:flex;flex-direction:column;gap:16px}
.ticklist li{display:flex;gap:14px;align-items:flex-start;font-size:1.02rem;color:#2C475F}
.ticklist li::before{content:"";flex:none;width:24px;height:24px;border-radius:7px;background:rgba(28,127,196,.12);background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231C7FC4' stroke-width='3'%3E%3Cpath d='M20 6L9 17l-5-5'/%3E%3C/svg%3E");background-size:15px;background-repeat:no-repeat;background-position:center;margin-top:3px}

/* ---------- Process steps ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;counter-reset:s}
.step{position:relative;padding-top:18px}
.step .n{font-family:var(--f-display);font-weight:800;font-size:3.2rem;color:var(--paper-2);line-height:1}
.bg-navy .step .n{color:rgba(255,255,255,.14)}
.step h3{font-size:1.18rem;margin:8px 0 8px}
.step p{font-size:.95rem}

/* ---------- Dual analysis ---------- */
.dual{display:grid;grid-template-columns:1fr 1fr;gap:28px;margin-top:10px}
.dual .panel{background:#fff;border-radius:var(--r);padding:38px 34px;border-top:4px solid var(--blue);box-shadow:var(--shadow-sm)}
.dual .panel:last-child{border-top-color:var(--navy)}
.dual .panel h3{display:flex;align-items:center;gap:12px}
.dual .tag{font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;font-family:var(--f-display);font-weight:700;color:var(--blue);background:rgba(28,127,196,.1);padding:4px 10px;border-radius:30px}

/* ---------- Team : grandes photos ---------- */
.team-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px;max-width:1100px;margin:0 auto}
.member{background:#fff;border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow-sm);transition:transform .4s,box-shadow .4s}
.member:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.member .photo{position:relative;aspect-ratio:4/5;overflow:hidden;background:var(--paper-2)}
.member .photo img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0;transition:opacity .5s}
.member .photo .bw{z-index:1}
.member .photo .col{z-index:2;opacity:0}
.member:hover .photo .col{opacity:1}
.member .photo::after{content:"";position:absolute;inset:0;z-index:3;background:linear-gradient(180deg,transparent 60%,rgba(8,32,58,.5));pointer-events:none}
.member .body{padding:26px 30px 30px}
.member h3{margin-bottom:2px}
.member .role{color:var(--blue);font-family:var(--f-display);font-weight:600;font-size:.95rem;margin-bottom:14px}
.member .bio{font-size:.97rem;margin-bottom:18px}
.member .contact{display:flex;flex-direction:column;gap:7px;font-size:.95rem;color:var(--steel)}
.member .contact a{display:inline-flex;align-items:center;gap:9px}
.member .contact a:hover{color:var(--blue)}
.member .contact svg{width:16px;height:16px;stroke:var(--blue);fill:none;stroke-width:1.7;flex:none}

/* ---------- Projet vedette ---------- */
.feature{display:grid;grid-template-columns:1.1fr .9fr;gap:0;border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow);background:#fff;margin-bottom:24px}
.feature.rev{grid-template-columns:.9fr 1.1fr}
.feature.rev .feature-media{order:2}
.feature.rev .feature-body{order:1}
.feature-media{position:relative;min-height:420px}
.feature-media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.feature-body{padding:48px 46px}
.feature-body .cat{font-size:.74rem;letter-spacing:.14em;text-transform:uppercase;color:var(--blue);font-weight:700;font-family:var(--f-display)}
.feature-body h2{font-size:clamp(1.7rem,2.6vw,2.3rem);margin:10px 0 6px}
.feature-body .loc{color:var(--steel);font-family:var(--f-display);font-weight:600;font-size:.98rem;margin-bottom:18px}
.feature-body>p{font-size:1rem}
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:28px;padding-top:26px;border-top:1px solid var(--line)}
.stat b{display:block;font-family:var(--f-display);font-size:1.5rem;color:var(--navy);line-height:1}
.stat span{font-size:.85rem;color:var(--steel)}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.gallery img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--r);box-shadow:var(--shadow-sm);transition:transform .4s}
.gallery img:hover{transform:scale(1.02)}

/* ---------- Projects ---------- */
.proj-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.proj{position:relative;border-radius:var(--r);overflow:hidden;aspect-ratio:4/3;background:var(--paper-2);box-shadow:var(--shadow-sm)}
.proj img{width:100%;height:100%;object-fit:cover;transition:transform .6s}
.proj:hover img{transform:scale(1.06)}
.proj .ov{position:absolute;inset:0;background:linear-gradient(180deg,transparent 35%,rgba(8,32,58,.88));display:flex;flex-direction:column;justify-content:flex-end;padding:26px;color:#fff}
.proj .cat{font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--blue-bright);font-weight:700;font-family:var(--f-display)}
.proj h3{color:#fff;font-size:1.2rem;margin-top:4px}
.proj.soon{display:grid;place-items:center;border:2px dashed var(--line);background:#fff;box-shadow:none}
.proj.soon span{color:var(--steel);font-family:var(--f-display);font-weight:600}

/* ---------- CTA band ---------- */
.cta-band{background:linear-gradient(120deg,var(--navy) 0%,var(--blue) 130%);color:#fff;text-align:center;border-radius:var(--r);padding:64px 40px;position:relative;overflow:hidden}
.cta-band::before{content:"";position:absolute;inset:0;background:url('img/hero_blueprint.jpg') center/cover;opacity:.12;mix-blend-mode:luminosity}
.cta-band>*{position:relative;z-index:1}
.cta-band h2{color:#fff;max-width:18ch;margin:0 auto 18px}
.cta-band p{color:#CFE0EE;max-width:50ch;margin:0 auto 30px}

/* ---------- Contact form ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px}
.field{margin-bottom:20px}
.field label{display:block;font-family:var(--f-display);font-weight:600;font-size:.85rem;margin-bottom:7px;color:var(--navy)}
.field input,.field select,.field textarea{
  width:100%;padding:14px 16px;border:1.5px solid var(--line);border-radius:10px;
  font-family:var(--f-body);font-size:1rem;background:#fff;transition:border-color .25s,box-shadow .25s;
}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 4px rgba(28,127,196,.12)}
.field textarea{min-height:130px;resize:vertical}
.info-block{display:flex;gap:16px;margin-bottom:26px}
.info-block .ic{flex:none;width:46px;height:46px;border-radius:11px;display:grid;place-items:center;background:rgba(28,127,196,.1)}
.info-block .ic svg{width:22px;height:22px;stroke:var(--blue);fill:none;stroke-width:1.8}
.info-block h4{font-family:var(--f-display);color:var(--navy);font-size:1rem;margin-bottom:3px}
.info-block p,.info-block a{color:var(--steel);font-size:.97rem}
.info-block a:hover{color:var(--blue)}

/* ---------- Page banner (inner pages) ---------- */
.banner{background:linear-gradient(120deg,var(--navy-deep),var(--navy));color:#fff;padding:150px 0 70px;position:relative;overflow:hidden}
.banner .bp{position:absolute;inset:0;background:url('img/hero_blueprint.jpg') center/cover;opacity:.15;mix-blend-mode:luminosity}
.banner .wrap{position:relative;z-index:1}
.banner h1{color:#fff}
.banner p{color:#C6D6E6;max-width:54ch;margin-top:16px;font-size:1.15rem}
.crumb{font-family:var(--f-display);font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;color:var(--blue-bright);margin-bottom:16px}

/* ---------- Footer ---------- */
footer.site{background:var(--navy-deep);color:#fff;padding:70px 0 30px}
.foot-brand{display:flex;align-items:flex-start;gap:24px}
.foot-logo{height:110px;width:auto;flex:none}
.foot-brand p{margin-top:4px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;padding-bottom:46px;border-bottom:1px solid rgba(255,255,255,.1)}
footer p{color:#9DB2C6;font-size:.95rem;max-width:34ch}
footer h4{font-family:var(--f-display);font-size:.95rem;letter-spacing:.05em;margin-bottom:16px;color:#fff}
footer ul{list-style:none;display:flex;flex-direction:column;gap:10px}
footer ul a{color:#9DB2C6;font-size:.95rem}
footer ul a:hover{color:var(--blue-bright)}
.foot-bot{display:flex;justify-content:space-between;align-items:center;padding-top:24px;color:#7C92A8;font-size:.85rem;flex-wrap:wrap;gap:10px}

/* ---------- Responsive ---------- */
@media(max-width:900px){
  .menu{position:fixed;inset:0 0 0 auto;width:78%;max-width:320px;background:#fff;flex-direction:column;justify-content:center;gap:28px;transform:translateX(100%);transition:transform .35s;box-shadow:var(--shadow);padding:40px}
  .menu.open{transform:none}
  .menu a{font-size:1.2rem}
  .burger{display:flex}
  header.site .menu .btn{display:none}
  .market-grid,.benefit-grid,.steps,.proj-grid,.gallery{grid-template-columns:1fr 1fr}
  .split,.contact-grid,.feature,.feature.rev{grid-template-columns:1fr;gap:36px}
  .feature{gap:0}
  .feature.rev .feature-media{order:1}
  .feature.rev .feature-body{order:2}
  .feature-media{min-height:300px}
  .feature-body{padding:34px 28px}
  .split.rev{direction:ltr}
  .dual,.team-grid,.foot-grid{grid-template-columns:1fr}
  .fullband{min-height:auto;padding:70px 0}
}
@media(max-width:600px){
  .market-grid,.benefit-grid,.steps,.proj-grid,.gallery{grid-template-columns:1fr}
  .market{aspect-ratio:4/3}
  .stats{grid-template-columns:1fr 1fr}
  .hero-foot{position:static;margin-top:30px}
  .hero .wrap{padding-bottom:40px}
  body{font-size:16px}
}