/* Identite : graphite, beton et un seul accent rouille. Angles droits partout :
   c'est un bureau d'etudes, pas une application. Clair ou sombre selon l'appareil. */
:root{
  --bg:#f2f3f4; --bg-2:#e8eaec; --surface:#fbfbfc; --text:#111417; --muted:#58616a;
  --line:#d3d7db; --line-strong:#b9bfc5; --accent:#b53f16; --accent-ink:#ffffff;
  --grid:rgba(17,20,23,.06);
  --font:"Geist Variable",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"Geist Mono Variable",ui-monospace,Menlo,monospace;
  --wrap:1240px;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0e1012; --bg-2:#14171a; --surface:#171a1d; --text:#e8ebee; --muted:#98a1a9;
    --line:#252a2f; --line-strong:#353c42; --accent:#e25a2c; --accent-ink:#0e1012;
    --grid:rgba(232,235,238,.05);
  }
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--text);font-size:16.5px;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 28px}
@media (max-width:767px){.wrap{padding:0 18px}}

/* Boutons : angles droits, un seul accent. */
.btn{display:inline-flex;align-items:center;gap:10px;font:600 15px/1 var(--font);padding:15px 22px;border:1px solid transparent;white-space:nowrap;transition:transform .2s cubic-bezier(.16,1,.3,1),background .2s,border-color .2s,color .2s}
.btn:active{transform:translateY(1px) scale(.99)}
.btn-accent{background:var(--accent);color:var(--accent-ink)}
.btn-accent:hover{filter:brightness(1.07)}
.btn-line{border-color:var(--line-strong);color:var(--text)}
.btn-line:hover{border-color:var(--text)}
.btn i{font-size:18px}

/* --- Navigation ---------------------------------------------------------- */
.nav{position:fixed;inset:0 0 auto 0;z-index:40;height:68px;display:flex;align-items:center;border-bottom:1px solid transparent;transition:background .3s,border-color .3s}
.nav.plein{background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-color:var(--line)}
.nav .wrap{display:flex;align-items:center;gap:32px;width:100%}
.marque{display:flex;align-items:center;gap:12px;font-weight:700;letter-spacing:.09em;font-size:15.5px}
.marque .symbole{height:34px;width:auto;color:var(--text);flex:none}
footer .marque{font-size:14px;color:var(--text)}
footer .marque .symbole{height:24px}
.nav-liens{display:flex;gap:28px;margin-left:auto;font-size:15px;color:var(--muted)}
.nav-liens a:hover{color:var(--text)}
.burger{display:none;margin-left:auto;background:none;border:1px solid var(--line-strong);color:var(--text);width:42px;height:42px;font-size:20px;cursor:pointer}
.menu-mob{display:none}
@media (max-width:900px){
  .nav-liens,.nav .btn{display:none}
  .burger{display:grid;place-items:center}
  .menu-mob.ouvert{display:grid;position:fixed;top:68px;left:0;right:0;z-index:39;background:var(--bg);border-bottom:1px solid var(--line);padding:10px 18px 22px;gap:4px}
  .menu-mob a{padding:14px 0;border-bottom:1px solid var(--line);font-size:17px}
  .menu-mob .btn{margin-top:14px;justify-content:center}
}

/* --- Haut de page ------------------------------------------------------------ */
.hero{position:relative;min-height:min(calc(100svh - 175px),900px);padding-top:68px;display:grid;overflow:hidden;
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:44px 44px}
.hero .wrap{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);align-items:center;gap:0;width:100%}
.hero-texte{padding:56px 0 72px}
.surtitre{font:500 12.5px/1 var(--mono);text-transform:uppercase;letter-spacing:.14em;color:var(--accent)}
.hero h1{font-size:clamp(40px,5.2vw,68px);line-height:1.02;letter-spacing:-.035em;font-weight:700;margin-top:22px;max-width:12ch}
.hero p.sous{margin-top:22px;color:var(--muted);font-size:18px;max-width:44ch}
.hero .actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:34px}
.scene{position:relative;height:min(calc(100svh - 287px),760px);min-height:400px;margin-bottom:44px;margin-right:calc((100vw - min(100vw,var(--wrap))) / -2 - 28px)}
.scene canvas{display:block;width:100%;height:100%}
.scene .fallback{position:absolute;inset:0;display:none}
.legende-scene{position:absolute;right:calc((100vw - min(100vw,var(--wrap))) / 2 + 28px);bottom:-28px;font:500 12px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--muted);pointer-events:none}
@media (max-width:900px){.legende-scene{right:18px;bottom:-24px;font-size:11px}}
@media (max-width:900px){
  .hero{min-height:auto}
  .hero .wrap{grid-template-columns:1fr}
  .hero-texte{padding:34px 0 8px;order:1}
  .scene{order:2;height:440px;min-height:0;margin:0 -18px 40px}
}

/* --- Chiffres ------------------------------------------------------------------ */
.chiffres{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--surface)}
.chiffres .wrap{display:grid;grid-template-columns:repeat(4,1fr)}
.chiffre{padding:34px 28px 34px 0;border-right:1px solid var(--line)}
.chiffre+.chiffre{padding-left:28px}
.chiffre:last-child{border-right:0}
.chiffre b{display:block;font:700 clamp(34px,4vw,48px)/1 var(--font);letter-spacing:-.04em}
.chiffre b small{color:var(--accent);font-size:.6em;margin-left:2px}
.chiffre span{display:block;margin-top:10px;color:var(--muted);font-size:14.5px;max-width:24ch}
@media (max-width:767px){
  .chiffres .wrap{grid-template-columns:1fr 1fr}
  .chiffre,.chiffre+.chiffre{padding:24px 12px}
  .chiffre:nth-child(2){border-right:0}
  .chiffre:nth-child(-n+2){border-bottom:1px solid var(--line)}
}

section{padding:112px 0}
@media (max-width:767px){section{padding:72px 0}}
h2{font-size:clamp(32px,3.6vw,48px);line-height:1.06;letter-spacing:-.03em;font-weight:700;max-width:18ch}
.intro{margin-top:18px;color:var(--muted);max-width:60ch}

/* --- Expertises : titre fixe a gauche, domaines a droite ---------------------- */
.expertises .wrap{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,8fr);gap:64px}
.expertises .colle{position:sticky;top:110px;align-self:start}
.domaines{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line)}
.domaine{padding:30px 28px 32px 0;border-bottom:1px solid var(--line)}
.domaine:nth-child(odd){border-right:1px solid var(--line)}
.domaine:nth-child(even){padding-left:28px;padding-right:0}
.domaine i{font-size:28px;color:var(--accent)}
.domaine h3{font-size:19px;letter-spacing:-.015em;margin-top:16px}
.domaine h3 a{display:inline-flex;align-items:center;gap:8px}
.domaine h3 a i{font-size:15px;color:var(--accent);opacity:0;transform:translate(-4px,4px);transition:opacity .25s,transform .25s}
.domaine:hover h3 a i,.domaine h3 a:focus-visible i{opacity:1;transform:none}
.domaine:hover h3 a{color:var(--accent)}
.domaine p{color:var(--muted);font-size:15px;margin-top:8px}
@media (max-width:900px){
  .expertises .wrap{grid-template-columns:1fr;gap:32px}
  .expertises .colle{position:static}
  .domaines{grid-template-columns:1fr}
  .domaine,.domaine:nth-child(even){padding:26px 0;border-right:0}
  .domaine:nth-child(odd){border-right:0}
}

/* --- Projets : grille a rythme ------------------------------------------------------ */
.projets{background:var(--bg-2)}
.grille{display:grid;grid-template-columns:repeat(12,1fr);gap:20px;margin-top:48px}
.projet{grid-column:span 4}
.projet.grand{grid-column:span 7;grid-row:span 2}
.projet.moyen{grid-column:span 5}
.projet .photo{overflow:hidden;background:var(--line);aspect-ratio:4/3}
.projet.grand .photo{aspect-ratio:auto;height:calc(100% - 78px);min-height:420px}
.projet .photo img{width:100%;height:100%;object-fit:cover;transition:transform .8s cubic-bezier(.16,1,.3,1)}
.projet:hover .photo img{transform:scale(1.035)}
.projet .legende{display:flex;justify-content:space-between;gap:16px;align-items:baseline;padding-top:14px}
.projet h3{font-size:17px;letter-spacing:-.01em}
.projet .lieu{color:var(--muted);font-size:14px;margin-top:2px}
.projet .mission{font:500 12px/1 var(--mono);text-transform:uppercase;letter-spacing:.1em;color:var(--accent);white-space:nowrap}
@media (max-width:900px){
  .grille{grid-template-columns:1fr 1fr}
  .projet,.projet.moyen{grid-column:span 1}
  .projet.grand{grid-column:span 2;grid-row:auto}
  .projet.grand .photo{height:auto;min-height:0;aspect-ratio:4/3}
}
@media (max-width:600px){.grille{grid-template-columns:1fr}.projet.grand,.projet{grid-column:span 1}}

/* --- Methode : la ligne se trace a l'entree dans l'ecran ------------------------------- */
.phases{position:relative;display:grid;grid-template-columns:repeat(5,1fr);gap:24px;margin-top:56px}
.phases::before{content:"";position:absolute;left:0;right:0;top:9px;height:1px;background:var(--line-strong)}
.phases::after{content:"";position:absolute;left:0;top:9px;height:1px;width:100%;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform 1.6s cubic-bezier(.16,1,.3,1)}
.phases.in::after{transform:scaleX(1)}
.phase{position:relative;padding-top:38px}
.phase::before{content:"";position:absolute;top:3px;left:0;width:13px;height:13px;background:var(--bg);border:1px solid var(--accent)}
.phase h3{font-size:17px;letter-spacing:-.01em}
.phase p{color:var(--muted);font-size:14.5px;margin-top:8px}
@media (max-width:900px){
  .phases{grid-template-columns:1fr;gap:0}
  .phases::before,.phases::after{left:6px;right:auto;top:0;bottom:0;width:1px;height:auto}
  .phases::after{transform:scaleY(0);transform-origin:top}
  .phases.in::after{transform:scaleY(1)}
  .phase{padding:0 0 30px 38px}
  .phase::before{top:4px}
}

/* --- Outils : un seul ruban defilant ------------------------------------------------------ */
.outils{padding:64px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow:hidden}
.outils .titre{color:var(--muted);font-size:15px;margin-bottom:26px}
.ruban{display:flex;width:max-content;gap:64px;animation:defile 38s linear infinite}
.ruban span{font:600 clamp(28px,3.4vw,44px)/1 var(--font);letter-spacing:-.03em;white-space:nowrap;color:var(--text)}
.ruban span em{font-style:normal;color:var(--muted);font-weight:400;font-size:.45em;letter-spacing:0;margin-left:14px;vertical-align:middle}
@keyframes defile{to{transform:translateX(-50%)}}

/* --- Implantations et direction --------------------------------------------------------------- */
.implantations .wrap{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:64px;align-items:start}
.direction{border-left:3px solid var(--accent);padding-left:24px;margin-top:34px}
.direction b{display:block;font-size:19px}
.direction span{display:block;color:var(--muted);font-size:15px;margin-top:4px}
.bureaux{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line)}
.bureau{padding:26px 24px 28px 0;border-bottom:1px solid var(--line)}
.bureau:nth-child(odd){border-right:1px solid var(--line)}
.bureau:nth-child(even){padding-left:24px;padding-right:0}
.bureau .pays{font:500 12px/1 var(--mono);text-transform:uppercase;letter-spacing:.12em;color:var(--muted)}
.bureau h3{font-size:22px;letter-spacing:-.02em;margin-top:10px}
.bureau p{color:var(--muted);font-size:14.5px;margin-top:6px}
.bureau a.tel{display:flex;width:max-content;gap:8px;align-items:center;margin-top:12px;font:500 15px/1 var(--mono)}
/* Un numero par ligne : le siege en affiche deux (fixe et portable, 04/10/2026). */
.bureau a.tel+a.tel{margin-top:10px}
.bureau a.tel:hover{color:var(--accent)}
@media (max-width:900px){
  .implantations .wrap{grid-template-columns:1fr;gap:40px}
  .bureaux{grid-template-columns:1fr}
  .bureau,.bureau:nth-child(even){padding:22px 0;border-right:0}
  .bureau:nth-child(odd){border-right:0}
}

/* --- Appel final ------------------------------------------------------------------------------ */
.final{background:var(--surface);border-top:1px solid var(--line)}
.final .wrap{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:56px;align-items:start}
.final h2{font-size:clamp(34px,4.2vw,58px);max-width:16ch}
.final .contacts{display:grid;gap:14px;justify-items:start}
.final .contacts a.ligne{font:500 16px/1.2 var(--mono);display:inline-flex;gap:10px;align-items:center;color:var(--muted)}
.final .contacts a.ligne:hover{color:var(--text)}
@media (max-width:900px){.final .wrap{grid-template-columns:1fr}}

footer{padding:34px 0 40px;color:var(--muted);font-size:14px}
footer .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
footer a{color:inherit;text-decoration:underline;text-underline-offset:3px}
footer a:hover{color:var(--text)}

/* --- Apparitions a l'entree dans l'ecran ---------------------------------------------------------- */
@media (prefers-reduced-motion: no-preference){
  .apparait{opacity:0;transform:translateY(22px);transition:opacity .9s cubic-bezier(.16,1,.3,1),transform .9s cubic-bezier(.16,1,.3,1)}
  .apparait.in{opacity:1;transform:none}
  .hero-texte>*{animation:monte .9s cubic-bezier(.16,1,.3,1) both}
  .hero-texte>*:nth-child(2){animation-delay:.08s}
  .hero-texte>*:nth-child(3){animation-delay:.16s}
  .hero-texte>*:nth-child(4){animation-delay:.24s}
  @keyframes monte{from{opacity:0;transform:translateY(18px)}}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .ruban{animation:none;flex-wrap:wrap;width:auto;gap:18px 40px}
  .phases::after{transition:none}
}

/* --- Menu deroulant des expertises --------------------------------------- */
.deroulant{position:relative;display:flex;align-items:center;gap:5px}
.chevron{background:none;border:0;color:inherit;padding:0;font-size:13px;line-height:1;display:grid;place-items:center;cursor:pointer}
.sous-menu{position:absolute;top:100%;left:-16px;min-width:290px;padding-top:16px;display:none}
.deroulant:hover .sous-menu,.deroulant.ouvert .sous-menu{display:block}
.sous-menu-boite{display:flex;flex-direction:column;background:var(--bg);border:1px solid var(--line);border-radius:14px;padding:8px;box-shadow:0 18px 44px rgba(0,0,0,.13)}
.sous-menu-boite a{padding:10px 12px;border-radius:9px;font-size:14px;color:var(--muted)}
.sous-menu-boite a:hover{background:color-mix(in srgb,var(--line) 70%,transparent);color:var(--text)}
.sous-menu-boite .tout{margin-top:6px;padding-top:12px;border-top:1px solid var(--line);border-radius:0;color:var(--accent)}
.menu-mob .mob-sous{padding-left:18px;font-size:15px;color:var(--muted)}

/* --- Le fondateur et les trois societes --------------------------------------
   Repris de son carrousel d'accueil : un volet par societe, chacun avec son
   drapeau et son texte. Le fondateur passe en tete, comme sur son site. */
.societes{padding-top:96px;padding-bottom:48px}
.societes+.expertises{padding-top:72px}
@media (max-width:767px){.societes{padding-bottom:32px}.societes+.expertises{padding-top:48px}}
.fondateur{max-width:820px}
.fondateur h2{max-width:22ch}
.carrousel{margin-top:44px;border:1px solid var(--line);background:var(--surface)}
.onglets{display:flex;flex-wrap:wrap;border-bottom:1px solid var(--line)}
.onglets button{display:inline-flex;align-items:center;gap:10px;padding:16px 22px;background:none;border:0;
  border-right:1px solid var(--line);font:500 14px/1 var(--font);color:var(--muted);cursor:pointer;
  box-shadow:inset 0 -2px 0 transparent;transition:color .2s,box-shadow .2s}
.onglets button:hover{color:var(--text)}
.onglets button[aria-selected="true"]{color:var(--text);box-shadow:inset 0 -2px 0 var(--accent)}
.drapeaux{display:inline-flex;gap:4px}
.drapeau{width:21px;height:14px;display:block;outline:1px solid var(--line-strong)}
.drapeaux.grand .drapeau{width:36px;height:24px}
.volet{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.volet[hidden]{display:none}
.volet-photo{margin:0;aspect-ratio:16/10;overflow:hidden;background:var(--line)}
.volet-photo img{width:100%;height:100%;object-fit:cover}
.volet-texte{padding:40px 36px;align-self:center}
.volet-texte h3{font-size:24px;letter-spacing:-.02em;margin-top:18px}
.volet-texte p{color:var(--muted);margin-top:14px;font-size:16px}
@media (prefers-reduced-motion: no-preference){
  .volet.actif .volet-photo img{animation:fondu .8s ease both}
  .volet.actif .volet-texte{animation:monte .7s cubic-bezier(.16,1,.3,1) both}
  @keyframes fondu{from{opacity:0;transform:scale(1.03)}}
}
@media (max-width:900px){
  .volet{grid-template-columns:1fr}
  .volet-texte{padding:26px 22px 30px}
  .onglets{display:grid;grid-template-columns:1fr 1fr}
  .onglets button{justify-content:center;padding:14px 8px;font-size:13.5px;border-bottom:1px solid var(--line)}
  .onglets button:nth-child(2n){border-right:0}
  .onglets .prefixe{display:none}
}

/* --- Formulaire de devis -------------------------------------------------------
   Angles droits comme le reste du site. Il poste sur sovba.com/api/demande. */
.devis{display:grid;grid-template-columns:1fr 1fr;gap:16px 18px}
.devis label{display:grid;gap:7px}
.devis label span{font:500 12px/1 var(--mono);text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}
.devis input,.devis select,.devis textarea{width:100%;font:400 15.5px/1.4 var(--font);color:var(--text);background:var(--bg);
  border:1px solid var(--line-strong);border-radius:0;padding:12px 13px;transition:border-color .2s}
.devis textarea{resize:vertical;min-height:130px}
.devis input:focus,.devis select:focus,.devis textarea:focus{outline:none;border-color:var(--accent)}
.devis .large{grid-column:1 / -1}
.devis button{justify-self:start}
.devis .mention{color:var(--muted);font-size:13px}
.devis .retour{grid-column:1 / -1;display:none;padding:14px 16px;font-size:15px;border-left:3px solid}
.devis .ok{border-color:#2f8f5b;background:color-mix(in srgb,#2f8f5b 12%,transparent)}
.devis .ko{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,transparent)}
@media (max-width:600px){.devis{grid-template-columns:1fr}}