/* ============================================================
   ARCEA · ACENIS — Bureau d'études pluridisciplinaire
   Design system "premium éditorial" : slate-acier + sauge + papier
   ============================================================ */

:root{
  /* Brand — acier (logo) */
  --steel-900:#263b46;
  --steel-700:#3b5867;
  --steel-600:#4e7180;   /* bleu logo */
  --steel-400:#7e9aa6;
  --steel-200:#c4d4db;
  --steel-50:#eef3f5;

  /* Nature — sauge / environnement */
  --sage-700:#516046;
  --sage-600:#6a7d57;
  --sage-300:#b3c0a0;
  --sage-50:#eef1e8;

  /* Warm accent — argile (très parcimonieux) */
  --clay:#b07a5b;

  /* Neutres chauds */
  --ink:#1e2c33;
  --slate:#46606c;
  --muted:#7a8a91;
  --paper:#f7f4ed;
  --sand:#efe9dd;
  --line:#e2dccf;
  --line-soft:#ece7da;
  --white:#ffffff;

  --shadow-sm:0 1px 2px rgba(30,44,51,.05);
  --shadow:0 24px 50px -28px rgba(30,44,51,.32);
  --shadow-lg:0 40px 80px -32px rgba(30,44,51,.42);

  --container:1240px;
  --gutter:clamp(22px,5vw,56px);
  --ease:cubic-bezier(.22,.7,.3,1);

  --serif:"Cormorant Garamond",Georgia,serif;
  --sans:"Inter",system-ui,-apple-system,sans-serif;
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
*{margin:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  font-family:var(--sans);
  color:var(--ink);
  background:var(--paper);
  line-height:1.7;
  font-weight:400;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg,iframe{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none;padding:0}
button{font:inherit;cursor:pointer}

h1,h2,h3{font-family:var(--serif);font-weight:500;line-height:1.06;letter-spacing:-.01em;color:var(--ink)}

.container{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:var(--gutter)}
.skip-link{position:absolute;left:-999px;top:0;background:var(--steel-700);color:#fff;padding:10px 16px;z-index:1000}
.skip-link:focus{left:0}
:focus-visible{outline:2px solid var(--steel-600);outline-offset:3px}
::selection{background:var(--steel-200)}

/* ---------- Typographic helpers ---------- */
.eyebrow{
  font-family:var(--sans);font-size:.74rem;font-weight:600;
  letter-spacing:.22em;text-transform:uppercase;color:var(--steel-600);
  display:inline-flex;align-items:center;gap:.7em;
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;opacity:.6}
.eyebrow.center::before{display:none}
.display{font-family:var(--serif);font-weight:500;font-size:clamp(2.6rem,6.4vw,5rem);line-height:1.02;letter-spacing:-.015em}
.lead{font-size:clamp(1.06rem,1.5vw,1.28rem);color:var(--slate);font-weight:300;line-height:1.6}
.idx{font-family:var(--serif);font-style:italic;color:var(--steel-400);font-size:1.4rem}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.7em;
  font-size:.86rem;font-weight:500;letter-spacing:.04em;
  padding:.95em 1.7em;border-radius:2px;border:1px solid transparent;
  transition:all .35s var(--ease);white-space:nowrap;
}
.btn svg{width:16px;height:16px;transition:transform .35s var(--ease)}
.btn-primary{background:var(--steel-700);color:#fff}
.btn-primary:hover{background:var(--steel-900)}
.btn-primary:hover svg{transform:translateX(4px)}
.btn-outline{border-color:var(--steel-300);color:var(--steel-700)}
.btn-outline:hover{border-color:var(--steel-700);background:var(--steel-700);color:#fff}
.btn-light{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.4);backdrop-filter:blur(6px)}
.btn-light:hover{background:#fff;color:var(--steel-900);border-color:#fff}
.btn-light:hover svg{transform:translateX(4px)}

.textlink{display:inline-flex;align-items:center;gap:.6em;font-weight:500;font-size:.9rem;color:var(--steel-700);border-bottom:1px solid var(--steel-300);padding-bottom:3px;transition:.3s var(--ease)}
.textlink svg{width:16px;height:16px;transition:transform .3s var(--ease)}
.textlink:hover{color:var(--steel-900);border-color:var(--steel-700)}
.textlink:hover svg{transform:translateX(4px)}

/* ============================================================
   HEADER
   ============================================================ */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  transition:background .4s var(--ease),box-shadow .4s var(--ease),border-color .4s;
  border-bottom:1px solid transparent;
}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:84px}
.site-header.is-solid{background:rgba(247,244,237,.9);backdrop-filter:saturate(150%) blur(14px);border-bottom-color:var(--line);box-shadow:0 6px 24px -20px rgba(30,44,51,.4)}

/* Logo wordmark (recréation fidèle ARCEA · ACENIS) */
.brand{display:inline-flex;flex-direction:column;line-height:.9;color:var(--steel-700)}
.brand-arcea{font-family:var(--serif);font-weight:600;font-size:1.85rem;letter-spacing:.16em;color:var(--steel-700)}
.brand-acenis{align-self:flex-end;font-family:var(--sans);font-weight:600;font-size:.52rem;letter-spacing:.42em;color:var(--steel-400);margin-top:2px;margin-right:.1em}
.is-hero-light .brand-arcea{color:#fff}
.is-hero-light .brand-acenis{color:rgba(255,255,255,.7)}

.main-nav{display:flex;align-items:center;gap:30px}
.main-nav a{position:relative;font-size:.82rem;font-weight:500;letter-spacing:.04em;color:var(--slate);padding:4px 0;transition:color .3s}
.main-nav a::after{content:"";position:absolute;left:0;right:100%;bottom:-2px;height:1px;background:var(--steel-600);transition:right .35s var(--ease)}
.main-nav a:hover,.main-nav a.active{color:var(--steel-900)}
.main-nav a:hover::after,.main-nav a.active::after{right:0}
.is-hero-light .main-nav a{color:rgba(255,255,255,.85)}
.is-hero-light .main-nav a:hover,.is-hero-light .main-nav a.active{color:#fff}
.is-hero-light .main-nav a::after{background:#fff}

.header-cta{margin-left:6px}
.is-hero-light .header-cta{border-color:rgba(255,255,255,.5);color:#fff}
.is-hero-light .header-cta:hover{background:#fff;color:var(--steel-900)}

.nav-toggle{display:none;flex-direction:column;gap:5px;width:46px;height:46px;align-items:center;justify-content:center;background:transparent;border:1px solid var(--line)}
.nav-toggle span{width:22px;height:1.5px;background:var(--ink);transition:.3s var(--ease)}
.is-hero-light .nav-toggle{border-color:rgba(255,255,255,.4)}
.is-hero-light .nav-toggle span{background:#fff}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

/* ============================================================
   HERO
   ============================================================ */
.hero{position:relative;min-height:100svh;display:flex;align-items:flex-end;color:#fff;overflow:hidden}
.hero-media{position:absolute;inset:0;z-index:-2}
.hero-media img{width:100%;height:100%;object-fit:cover;object-position:center 60%}
.hero-media::after{content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(20,34,42,.55) 0%,rgba(20,34,42,.18) 32%,rgba(20,34,42,.28) 62%,rgba(18,30,37,.86) 100%);}
.hero-inner{padding-bottom:clamp(54px,9vh,110px);padding-top:140px;width:100%}
.hero .eyebrow{color:#fff}
.hero .eyebrow::before{background:#fff}
.hero h1{font-size:clamp(3.2rem,10vw,8.2rem);font-weight:500;letter-spacing:-.02em;line-height:.94;margin:.18em 0 .28em;text-wrap:balance}
.hero h1 em{font-style:italic;color:var(--sage-300)}
.hero-sub{max-width:54ch;font-size:clamp(1.05rem,1.6vw,1.32rem);font-weight:300;color:rgba(255,255,255,.9);line-height:1.55}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:38px}
.hero-meta{display:flex;flex-wrap:wrap;gap:10px 34px;margin-top:54px;padding-top:26px;border-top:1px solid rgba(255,255,255,.2)}
.hero-meta div{display:flex;flex-direction:column;gap:2px}
.hero-meta dt{font-size:.7rem;letter-spacing:.18em;text-transform:uppercase;color:rgba(255,255,255,.6)}
.hero-meta dd{font-family:var(--serif);font-size:1.5rem;color:#fff}
.scroll-cue{position:absolute;right:var(--gutter);bottom:36px;writing-mode:vertical-rl;font-size:.68rem;letter-spacing:.25em;text-transform:uppercase;color:rgba(255,255,255,.7);display:flex;align-items:center;gap:14px}
.scroll-cue::after{content:"";width:1px;height:54px;background:rgba(255,255,255,.5);animation:cue 2.4s var(--ease) infinite}
@keyframes cue{0%{transform:scaleY(.2);transform-origin:top}50%{transform:scaleY(1);transform-origin:top}50.1%{transform-origin:bottom}100%{transform:scaleY(.2);transform-origin:bottom}}

/* ============================================================
   SECTIONS génériques
   ============================================================ */
.section{padding:clamp(72px,11vw,140px) 0}
.section--paper{background:var(--paper)}
.section--sand{background:var(--sand)}
.section--ink{background:var(--steel-900);color:#fff}
.section-head{max-width:760px;margin-bottom:clamp(40px,6vw,72px)}
.section-head.center{margin-inline:auto;text-align:center}
.section-head h2{font-size:clamp(2.1rem,4.6vw,3.4rem);margin-top:18px}
.section-head .lead{margin-top:20px}
.section--ink .section-head h2,.section--ink .eyebrow{color:#fff}
.section--ink .eyebrow{color:var(--sage-300)}
.section--ink .eyebrow::before{background:var(--sage-300)}
.section--ink .lead{color:rgba(255,255,255,.78)}

/* ---------- Intro / manifesto ---------- */
.intro-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(36px,6vw,84px);align-items:center}
.intro-figure{position:relative}
.intro-figure img{width:100%;aspect-ratio:4/5;object-fit:cover;border-radius:3px}
.intro-figure .tag{position:absolute;left:-26px;bottom:36px;background:var(--paper);padding:20px 26px;border-radius:3px;box-shadow:var(--shadow);max-width:230px}
.intro-figure .tag strong{display:block;font-family:var(--serif);font-size:2.6rem;color:var(--steel-700);line-height:1}
.intro-figure .tag span{font-size:.82rem;color:var(--slate)}
.intro-copy h2{font-size:clamp(1.9rem,3.6vw,2.9rem);margin:16px 0 22px}
.intro-copy p{color:var(--slate);margin-bottom:18px;max-width:54ch}
.intro-copy p .hl{color:var(--ink);font-style:italic;font-family:var(--serif);font-size:1.15em}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin-top:34px;border-top:1px solid var(--line)}
.stats div{padding:22px 18px 0 0}
.stats dt{font-family:var(--serif);font-size:2.4rem;color:var(--steel-700);line-height:1}
.stats dd{font-size:.82rem;color:var(--muted);margin-top:4px}

/* ---------- Expertises (lignes éditoriales) ---------- */
.expertise{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,5vw,72px);align-items:center;padding:clamp(40px,6vw,72px) 0;border-top:1px solid var(--line)}
.expertise:first-of-type{border-top:0}
.expertise .exp-media{overflow:hidden;border-radius:3px}
.expertise .exp-media img{width:100%;aspect-ratio:16/11;object-fit:cover;transition:transform 1.2s var(--ease)}
.expertise:hover .exp-media img{transform:scale(1.04)}
.expertise.reverse .exp-media{order:2}
.exp-num{font-family:var(--serif);font-style:italic;font-size:1.3rem;color:var(--steel-400)}
.expertise h3{font-size:clamp(1.7rem,3.2vw,2.5rem);margin:10px 0 16px}
.expertise p{color:var(--slate);margin-bottom:20px;max-width:48ch}
.exp-list{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:8px}
.exp-list li{font-size:.8rem;color:var(--steel-700);background:var(--steel-50);border:1px solid var(--steel-200);padding:.42em .9em;border-radius:2px}

/* ---------- Bande approche (full bleed) ---------- */
.band{position:relative;color:#fff;padding:clamp(90px,16vw,200px) 0;overflow:hidden}
.band-media{position:absolute;inset:0;z-index:-2}
.band-media img{width:100%;height:100%;object-fit:cover}
.band-media::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(24,38,45,.9),rgba(24,38,45,.6) 60%,rgba(24,38,45,.35))}
.band blockquote{max-width:30ch}
.band .eyebrow{color:var(--sage-300)}
.band .eyebrow::before{background:var(--sage-300)}
.band blockquote p{font-family:var(--serif);font-size:clamp(1.8rem,4vw,3.1rem);line-height:1.18;font-weight:500;margin:20px 0 24px}
.band blockquote p em{font-style:italic;color:var(--sage-300)}
.band blockquote cite{font-style:normal;font-size:.86rem;letter-spacing:.06em;color:rgba(255,255,255,.7)}

/* ---------- Agréments ---------- */
.agr-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(36px,6vw,80px);align-items:start}
.agr-list{display:grid;gap:18px}
.agr-item{display:flex;gap:16px;padding-bottom:18px;border-bottom:1px solid var(--line)}
.agr-item svg{width:26px;height:26px;color:var(--sage-600);flex-shrink:0;margin-top:2px}
.agr-item h4{font-family:var(--sans);font-size:.98rem;font-weight:600;color:var(--ink);margin-bottom:2px}
.agr-item p{font-size:.86rem;color:var(--muted)}
.cat-card{background:var(--steel-900);color:#fff;border-radius:3px;padding:clamp(28px,4vw,44px)}
.cat-card h3{color:#fff;font-size:1.7rem;margin-bottom:6px}
.cat-card .sub{color:rgba(255,255,255,.6);font-size:.84rem;margin-bottom:24px}
.cat-list{counter-reset:cat;display:grid;gap:2px}
.cat-list li{display:flex;gap:16px;align-items:baseline;padding:13px 0;border-top:1px solid rgba(255,255,255,.12);color:rgba(255,255,255,.9);font-size:.92rem}
.cat-list li::before{counter-increment:cat;content:counter(cat,decimal-leading-zero);font-family:var(--serif);font-style:italic;color:var(--sage-300);font-size:1.05rem}

/* ---------- Équipe ---------- */
.team-lead{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:48px}
.lead-card{background:var(--white);border:1px solid var(--line);border-radius:3px;padding:30px 28px;transition:.4s var(--ease)}
.lead-card:hover{box-shadow:var(--shadow);transform:translateY(-4px)}
.lead-card .role-ic{width:40px;height:40px;border-radius:50%;background:var(--steel-50);color:var(--steel-700);display:grid;place-items:center;margin-bottom:18px}
.lead-card .role-ic svg{width:20px;height:20px}
.lead-card h4{font-family:var(--serif);font-size:1.5rem;color:var(--ink)}
.lead-card .fn{font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:var(--steel-600);margin:4px 0 10px}
.lead-card p{font-size:.88rem;color:var(--muted)}
.team-disciplines{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:40px}
.team-disciplines span{font-size:.84rem;color:var(--steel-700);border:1px solid var(--line);background:var(--white);padding:.5em 1.1em;border-radius:2px}
.team-roster{columns:3;column-gap:40px;border-top:1px solid var(--line);padding-top:32px}
.team-roster li{break-inside:avoid;padding:7px 0;font-size:.92rem;color:var(--slate)}
.team-roster li b{color:var(--ink);font-weight:500}

/* ---------- Références ---------- */
.ref-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:clamp(36px,6vw,72px)}
.ref-cols{columns:2;column-gap:32px}
.ref-cols li{break-inside:avoid;display:flex;gap:12px;padding:9px 0;font-size:.94rem;color:var(--slate);align-items:baseline}
.ref-cols li::before{content:"";width:5px;height:5px;flex-shrink:0;background:var(--sage-600);border-radius:50%;transform:translateY(8px)}
.partners-box{background:var(--sage-50);border:1px solid var(--sage-300);border-radius:3px;padding:clamp(26px,4vw,38px)}
.partners-box h3{font-size:1.5rem;margin-bottom:14px}
.partners-box p{font-size:.92rem;color:var(--slate);margin-bottom:16px}
.partners-box .disc{display:flex;flex-wrap:wrap;gap:8px}
.partners-box .disc span{font-size:.78rem;color:var(--sage-700);background:var(--white);border:1px solid var(--sage-300);padding:.4em .85em;border-radius:2px}
.acenis-note{margin-top:22px;padding-top:18px;border-top:1px solid var(--sage-300);font-size:.86rem;color:var(--slate)}
.acenis-note b{color:var(--sage-700)}

/* ---------- Galerie / réalisations ---------- */
.gallery{display:grid;grid-template-columns:repeat(4,1fr);grid-auto-rows:200px;gap:14px}
.gallery figure{overflow:hidden;border-radius:3px;position:relative}
.gallery img{width:100%;height:100%;object-fit:cover;transition:transform 1.1s var(--ease)}
.gallery figure:hover img{transform:scale(1.06)}
.gallery .wide{grid-column:span 2}
.gallery .tall{grid-row:span 2}
.gallery figcaption{position:absolute;left:14px;bottom:12px;font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;color:#fff;text-shadow:0 1px 6px rgba(0,0,0,.6);opacity:0;transform:translateY(8px);transition:.4s var(--ease)}
.gallery figure:hover figcaption{opacity:1;transform:none}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:clamp(32px,5vw,64px);align-items:stretch}
.contact-info h2{font-size:clamp(2rem,4vw,3rem);margin:16px 0 26px}
.contact-list{display:grid;gap:22px;margin-bottom:34px}
.contact-list li{display:flex;gap:16px;align-items:flex-start}
.contact-list .ci{width:44px;height:44px;border-radius:50%;border:1px solid var(--line);display:grid;place-items:center;color:var(--steel-700);flex-shrink:0}
.contact-list .ci svg{width:20px;height:20px}
.contact-list dt{font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:3px}
.contact-list dd{font-size:1.05rem;color:var(--ink)}
.contact-list dd a:hover{color:var(--steel-700)}
.contact-map{border-radius:3px;overflow:hidden;border:1px solid var(--line);min-height:420px;position:relative;box-shadow:var(--shadow)}
.contact-map iframe{width:100%;height:100%;min-height:420px;border:0;filter:grayscale(.25) contrast(1.03)}
.map-pill{position:absolute;left:16px;bottom:16px;background:var(--white);padding:.6em 1em;font-size:.84rem;font-weight:500;color:var(--steel-700);border-radius:2px;box-shadow:var(--shadow)}

/* ---------- Footer ---------- */
.site-footer{background:var(--steel-900);color:rgba(255,255,255,.7);padding-top:clamp(56px,8vw,84px)}
.footer-top{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;padding-bottom:48px;border-bottom:1px solid rgba(255,255,255,.12)}
.footer-brand .brand-arcea{color:#fff}
.footer-brand .brand-acenis{color:rgba(255,255,255,.6)}
.footer-brand p{margin-top:20px;max-width:38ch;font-size:.92rem;line-height:1.7}
.site-footer h5{font-family:var(--sans);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:rgba(255,255,255,.5);margin-bottom:16px}
.footer-col a,.footer-col p{display:block;color:rgba(255,255,255,.78);font-size:.92rem;padding:5px 0;transition:color .3s}
.footer-col a:hover{color:#fff}
.footer-base{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;padding:24px 0;font-size:.8rem;color:rgba(255,255,255,.5)}
.footer-base a:hover{color:#fff}

/* ---------- Reveal ---------- */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.08s}.reveal.d2{transition-delay:.16s}.reveal.d3{transition-delay:.24s}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width:980px){
  .intro-grid,.expertise,.expertise.reverse .exp-media,.agr-grid,.ref-grid,.contact-grid{grid-template-columns:1fr}
  .expertise .exp-media,.expertise.reverse .exp-media{order:-1}
  .intro-figure{max-width:480px}
  .intro-figure .tag{left:0}
  .team-lead{grid-template-columns:1fr;gap:16px}
  .team-roster{columns:2}
  .ref-cols{columns:1}
  .gallery{grid-template-columns:repeat(2,1fr);grid-auto-rows:170px}
}
@media (max-width:760px){
  body{font-size:16px}
  .main-nav{
    position:fixed;inset:84px 0 auto;flex-direction:column;align-items:flex-start;gap:0;
    background:var(--paper);border-bottom:1px solid var(--line);padding:14px var(--gutter) 26px;
    transform:translateY(-130%);transition:transform .45s var(--ease);max-height:calc(100svh - 84px);overflow:auto;
  }
  .main-nav.open{transform:none}
  .main-nav a{width:100%;padding:14px 0;border-bottom:1px solid var(--line-soft);font-size:1rem;color:var(--ink)}
  .main-nav .header-cta{margin-top:16px}
  .is-hero-light .main-nav a{color:var(--ink)}
  .nav-toggle{display:flex}
  .header-cta:not(.in-nav){display:none}
  .stats{grid-template-columns:1fr 1fr}
  .team-roster{columns:1}
  .hero-meta{gap:18px 24px}
  .hero-meta dd{font-size:1.25rem}
}
@media (max-width:520px){
  .gallery{grid-template-columns:1fr;grid-auto-rows:220px}
  .gallery .wide,.gallery .tall{grid-column:auto;grid-row:auto}
  .btn{width:100%;justify-content:center}
  .hero-actions{flex-direction:column}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important;scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}