/* ===== Boussole, feuille de style commune ===== */
@import url('https://fonts.googleapis.com/css2?family=Cormorant:ital,wght@0,300;0,400;0,500;0,600;1,300;1,400;1,500&family=Inter:wght@200;300;400;500;600&display=swap');

:root{
  --anthr-1:#25282C;
  --anthr-2:#2E3136;
  --anthr-3:#1B1D20;
  --panel:#26292D;
  --panel-2:#2C2F33;
  --white:#FFFFFF;
  --ink:#15130F;
  --ink-dim:#6B6558;
  --cloud:#FBFAF8;
  --pearl:#EDEBE6;
  --pearl-dim:#B9B6AE;
  --pearl-faint:#7C7970;
  --red:#CE2F34;
  --red-deep:#8E1F22;
  --steel:#ADB0AF;
  --steel-soft:#787B7A;
  --line: rgba(255,255,255,0.10);
  --line-strong: rgba(255,255,255,0.22);
  --ease: cubic-bezier(.16,.8,.24,1);

  /* rôles de thème (CLAIR par défaut) */
  --bg-1: #FFFFFF;
  --bg-2: #FFFFFF;
  --bg-3: #F5F6F7;
  --text-main: #14161A;
  --text-dim: #5A5F66;
  --text-faint: #8C9198;
  --surface: #FFFFFF;
  --surface-2: #F5F6F7;
  --border: rgba(20,22,26,0.11);
  --border-strong: rgba(20,22,26,0.24);
  --header-bg: rgba(255,255,255,0.92);
  --header-bg-top: rgba(255,255,255,0);
}

html[data-theme="dark"]{
  --bg-1: var(--anthr-2);
  --bg-2: var(--anthr-1);
  --bg-3: var(--anthr-3);
  --text-main: var(--pearl);
  --text-dim: var(--pearl-dim);
  --text-faint: var(--pearl-faint);
  --surface: var(--panel);
  --surface-2: var(--panel-2);
  --border: var(--line);
  --border-strong: var(--line-strong);
  --header-bg: rgba(27,29,32,0.86);
  --header-bg-top: rgba(27,29,32,0);
}

*{box-sizing:border-box; margin:0; padding:0;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important;}
}
body{
  background: radial-gradient(ellipse 140% 70% at 50% -12%, var(--bg-1) 0%, var(--bg-2) 48%, var(--bg-3) 100%);
  background-attachment:fixed;
  color:var(--text-main);
  font-family:'Inter', sans-serif;
  font-weight:300;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  transition:background .35s var(--ease), color .35s var(--ease);
  overflow-x:hidden;
  position:relative;
}
::selection{background:var(--red); color:var(--white);}
a{color:inherit; text-decoration:none;}
img{max-width:100%; display:block;}
h1,h2,h3{ text-wrap:balance; }
button{font-family:inherit; cursor:pointer;}

.eyebrow{
  font-size:10.5px;
  font-weight:400;
  letter-spacing:0.32em;
  text-transform:uppercase;
  color:var(--text-faint);
  display:flex; align-items:center; gap:14px;
}
.eyebrow::before{ content:''; width:24px; height:1px; background:var(--red); display:inline-block; }

h1,h2,h3,h4{
  font-family:'Cormorant', serif;
  font-weight:300;
  line-height:1.08;
  letter-spacing:-0.008em;
  color:var(--text-main);
}
.num{ font-family:'Cormorant', serif; font-weight:300; font-variant-numeric:tabular-nums; }

.wrap{ max-width:1240px; margin:0 auto; padding:0 48px; }
@media(max-width:768px){ .wrap{padding:0 22px;} }

/* ---------- HEADER ---------- */
header{
  position:fixed; top:0; left:0; right:0; z-index:100;
  display:flex; align-items:center; justify-content:space-between;
  padding:26px 48px;
  background:linear-gradient(to bottom, var(--header-bg), var(--header-bg-top));
  transition:background .3s var(--ease), padding .3s var(--ease), border-color .3s var(--ease);
  border-bottom:1px solid transparent;
}
header.scrolled{
  background:var(--header-bg);
  backdrop-filter:blur(10px);
  padding:14px 48px;
  border-bottom:1px solid var(--border);
}
@media(max-width:900px){ header, header.scrolled{padding:18px 22px;} }

.logo{ display:flex; align-items:center; gap:12px; }
.logo img{ height:38px; width:auto; transition:height .3s var(--ease); }
.logo span{ font-family:'Cormorant', serif; font-size:22px; letter-spacing:0.02em; color:var(--text-main); }

nav{ display:flex; align-items:center; gap:34px; }
nav a{
  font-size:12.5px; letter-spacing:0.05em; text-transform:uppercase;
  color:var(--text-dim); position:relative; padding:4px 0;
  transition:color .25s var(--ease);
}
nav a:hover, nav a.active{ color:var(--text-main); }
nav a.active::after{
  content:''; position:absolute; left:0; right:0; bottom:-6px; height:1px; background:var(--red);
}
nav a.btn-nav{
  border:1px solid var(--border-strong); padding:9px 18px; border-radius:2px; color:var(--text-main);
}
nav a.btn-nav:hover{ border-color:var(--red); color:var(--red); }

.navToggle{
  display:none; background:none; border:1px solid var(--border-strong); color:var(--text-main);
  padding:8px 14px; font-size:12px; letter-spacing:0.06em; text-transform:uppercase; border-radius:2px;
}
@media(max-width:900px){
  nav{ display:none; }
  .navToggle{ display:block; }
}

/* ---------- HERO ---------- */
.hero{ padding:180px 0 90px; position:relative; }
.hero .wrap{ max-width:920px; }
.hero .eyebrow{ margin-bottom:26px; }
.hero h1{ font-size:clamp(38px,6vw,76px); margin-bottom:26px; }
.hero h1 em{ font-style:italic; color:var(--red); }
.hero p.lead{ font-size:17px; color:var(--text-dim); font-weight:300; max-width:640px; line-height:1.65; margin-bottom:40px; }
.hero .cta-row{ display:flex; gap:16px; flex-wrap:wrap; margin-bottom:44px; }

.btn{
  display:inline-flex; align-items:center; gap:10px; padding:14px 26px;
  font-size:12.5px; letter-spacing:0.08em; text-transform:uppercase; border-radius:2px;
  transition:all .25s var(--ease);
}
.btn-primary{ background:var(--red); color:var(--white); }
.btn-primary:hover{ background:var(--red-deep); }
.btn-ghost{ border:1px solid var(--border-strong); color:var(--text-main); }
.btn-ghost:hover{ border-color:var(--red); color:var(--red); }

.trust-line{ font-size:12px; color:var(--text-faint); letter-spacing:0.03em; padding-top:26px; border-top:1px solid var(--border); }

/* ---------- STATS ---------- */
.stats{ padding:40px 0 70px; }
.stats-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--border); border:1px solid var(--border); }
.stat-card{ background:var(--bg-2); padding:30px 26px; }
.stat-card .num{ font-size:46px; color:var(--text-main); display:flex; align-items:baseline; gap:4px; }
.stat-card .num small{ font-size:18px; color:var(--red); }
.stat-card p{ font-size:12.5px; color:var(--text-dim); margin-top:8px; line-height:1.5; }
@media(max-width:820px){ .stats-grid{ grid-template-columns:repeat(2,1fr);} }

/* ---------- SECTIONS ---------- */
.sec{ padding:110px 0; }
.sec-head{ max-width:680px; margin-bottom:56px; }
.sec-head .eyebrow{ margin-bottom:18px; }
.sec-head h2{ font-size:clamp(28px,4vw,44px); }
.sec-head p.sub{ margin-top:16px; color:var(--text-dim); font-size:15.5px; line-height:1.6; }

/* Edito / citation */
.edito{ padding:100px 0; border-top:1px solid var(--border); border-bottom:1px solid var(--border); }
.edito blockquote{ font-family:'Cormorant', serif; font-style:italic; font-size:clamp(22px,3vw,32px); line-height:1.5; color:var(--text-main); max-width:900px; }
.edito .signatures{ display:flex; gap:48px; margin-top:40px; flex-wrap:wrap; }
.edito .signatures div p:first-child{ font-family:'Cormorant', serif; font-size:19px; color:var(--text-main); }
.edito .signatures div p:last-child{ font-size:12.5px; color:var(--text-faint); letter-spacing:0.02em; }

/* Cards grid (bureau d'études) */
.trio{ display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--border); border:1px solid var(--border); }
.trio-item{ background:var(--bg-2); padding:38px 32px; }
.trio-item .num{ font-size:32px; color:var(--red); display:block; margin-bottom:16px; }
.trio-item h4{ font-size:20px; margin-bottom:10px; }
.trio-item p{ font-size:14px; color:var(--text-dim); line-height:1.6; }
@media(max-width:820px){ .trio{ grid-template-columns:1fr; } }

/* Process phases */
.phases{ display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--border); border:1px solid var(--border); }
.phase{ background:var(--bg-2); padding:34px 28px; }
.phase .tag{ font-size:11px; letter-spacing:0.08em; text-transform:uppercase; color:var(--red); margin-bottom:10px; }
.phase h4{ font-size:21px; margin-bottom:16px; }
.phase ul{ list-style:none; }
.phase li{ font-size:13.5px; color:var(--text-dim); padding:8px 0; border-top:1px solid var(--border); }
.phase li:first-child{ border-top:none; }
@media(max-width:900px){ .phases{ grid-template-columns:1fr 1fr; } }
@media(max-width:560px){ .phases{ grid-template-columns:1fr; } }

/* Eco grid */
.eco-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--border); border:1px solid var(--border); margin-bottom:1px; }
.eco-card{ background:var(--bg-2); padding:30px 26px; }
.eco-card .tag{ font-size:11px; letter-spacing:0.08em; text-transform:uppercase; color:var(--red); margin-bottom:10px; }
.eco-card h4{ font-size:19px; margin-bottom:14px; }
.eco-card ul{ list-style:none; }
.eco-card li{ font-size:13px; color:var(--text-dim); line-height:1.55; padding:6px 0; }
.eco-card li::before{ content:'•'; color:var(--red); margin-right:8px; }
@media(max-width:900px){ .eco-grid{ grid-template-columns:1fr 1fr; } }
@media(max-width:560px){ .eco-grid{ grid-template-columns:1fr; } }

.reglementation{ background:var(--surface); border:1px solid var(--border); padding:36px; display:grid; grid-template-columns:170px 1fr; gap:28px; align-items:start; margin-top:1px; }
.reglementation .date{ font-family:'Cormorant', serif; }
.reglementation .date .d{ font-size:44px; color:var(--red); line-height:1; }
.reglementation .date .y{ font-size:15px; color:var(--text-dim); }
.reglementation h4{ font-size:20px; margin-bottom:10px; }
.reglementation p{ font-size:14px; color:var(--text-dim); line-height:1.65; margin-bottom:16px; }
@media(max-width:640px){ .reglementation{ grid-template-columns:1fr; } }

.conformite-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:24px; margin-top:40px; }
.conformite-item h4{ font-size:16px; margin-bottom:8px; color:var(--text-main); }
.conformite-item p{ font-size:13.5px; color:var(--text-dim); line-height:1.6; }
@media(max-width:640px){ .conformite-grid{ grid-template-columns:1fr; } }

/* Moyens */
.moyens-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--border); border:1px solid var(--border); }
.moyen-card{ background:var(--bg-2); padding:30px 26px; }
.moyen-card .num{ font-size:26px; color:var(--red); display:block; margin-bottom:10px; }
.moyen-card h4{ font-size:18px; margin-bottom:10px; }
.moyen-card p{ font-size:13.5px; color:var(--text-dim); line-height:1.55; }
@media(max-width:820px){ .moyens-grid{ grid-template-columns:1fr; } }

/* References */
.filters{ display:flex; gap:10px; flex-wrap:wrap; margin-bottom:40px; }
.filt{ background:none; border:1px solid var(--border-strong); color:var(--text-dim); padding:9px 18px; font-size:12px; letter-spacing:0.05em; text-transform:uppercase; border-radius:2px; }
.filt.active, .filt:hover{ border-color:var(--red); color:var(--text-main); }

.refs-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
@media(max-width:900px){ .refs-grid{ grid-template-columns:repeat(2,1fr); } }
@media(max-width:600px){ .refs-grid{ grid-template-columns:1fr; } }

.ref-card{ cursor:pointer; }
.ref-card.hide{ display:none; }
.ref-photo{ aspect-ratio:4/3; background-size:cover; background-position:center; border:1px solid var(--border); }
.ref-card .ref-tag{ font-size:11px; letter-spacing:0.06em; text-transform:uppercase; color:var(--red); margin-top:16px; }
.ref-card h4{ font-size:20px; margin-top:8px; }
.ref-card .ref-meta{ font-size:12.5px; color:var(--text-faint); margin-top:6px; }
.ref-card .ref-quote{ font-size:13.5px; color:var(--text-dim); margin-top:10px; line-height:1.55; }

.lightbox{ position:fixed; inset:0; background:rgba(10,10,10,0.94); z-index:200; display:none; align-items:center; justify-content:center; padding:40px; }
.lightbox.open{ display:flex; }
.lightbox-inner{ max-width:900px; width:100%; }
.lightbox-inner img{ width:100%; max-height:70vh; object-fit:cover; }
.lightbox-caption{ margin-top:18px; color:var(--pearl); }
.lightbox-caption .tag{ color:var(--red); font-size:11px; text-transform:uppercase; letter-spacing:0.06em; }
.lightbox-caption h4{ color:var(--pearl); font-size:24px; margin-top:6px; }
.lightbox-close{ position:absolute; top:26px; right:36px; background:none; border:none; color:var(--pearl); font-size:34px; }

/* Contact */
.contacts-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:1px; background:var(--border); border:1px solid var(--border); margin-bottom:60px; }
.contact-card{ background:var(--bg-2); padding:30px 28px; }
.contact-card .role{ font-size:11px; letter-spacing:0.06em; text-transform:uppercase; color:var(--red); margin-bottom:8px; }
.contact-card h3{ font-size:24px; margin-bottom:14px; }
.contact-card .details a{ display:block; font-size:14.5px; color:var(--text-dim); padding:3px 0; }
.contact-card .details a:hover{ color:var(--text-main); }
@media(max-width:640px){ .contacts-grid{ grid-template-columns:1fr; } }

.contact-layout{ display:grid; grid-template-columns:1.2fr 0.8fr; gap:60px; align-items:start; }
@media(max-width:900px){ .contact-layout{ grid-template-columns:1fr; } }

form.contact-form{ display:flex; flex-direction:column; gap:20px; }
.form-row{ display:grid; grid-template-columns:1fr 1fr; gap:20px; }
@media(max-width:560px){ .form-row{ grid-template-columns:1fr; } }
.field{ display:flex; flex-direction:column; gap:8px; }
.field label{ font-size:12px; letter-spacing:0.05em; text-transform:uppercase; color:var(--text-dim); }
.field input, .field select, .field textarea{
  background:var(--surface); border:1px solid var(--border-strong); color:var(--text-main);
  padding:13px 14px; font-family:'Inter', sans-serif; font-size:14.5px; font-weight:300; border-radius:2px;
  transition:border-color .2s var(--ease);
}
.field input:focus, .field select:focus, .field textarea:focus{ outline:none; border-color:var(--red); }
.field textarea{ resize:vertical; min-height:130px; }
.field-check{ display:flex; align-items:flex-start; gap:10px; font-size:12.5px; color:var(--text-dim); }
.field-check input{ margin-top:3px; }
.form-note{ font-size:12px; color:var(--text-faint); }
.form-success{ display:none; background:var(--surface); border:1px solid var(--border-strong); border-left:3px solid var(--red); padding:18px 20px; font-size:14px; color:var(--text-main); margin-top:14px; }
.form-success.show{ display:block; }

/* Footer */
footer{
  border-top:1px solid var(--border); padding:34px 0 60px; margin-top:40px;
  display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:16px;
  font-size:12.5px; color:var(--text-faint);
}
.footer-links{ display:flex; gap:22px; flex-wrap:wrap; }
.footer-links a{ color:var(--text-faint); }
.footer-links a:hover{ color:var(--text-main); }
.theme-toggle{
  display:inline-flex; align-items:center; gap:8px; background:none; border:1px solid var(--border-strong);
  color:var(--text-dim); padding:9px 16px; border-radius:20px; font-size:12px; letter-spacing:0.03em;
}
.theme-toggle:hover{ border-color:var(--red); color:var(--text-main); }
.theme-toggle .dot{ width:8px; height:8px; border-radius:50%; background:var(--red); }

/* Reveal on scroll */
.reveal{ opacity:0; transform:translateY(18px); transition:opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in{ opacity:1; transform:none; }

/* Page intro (pages secondaires) */
.page-hero{ padding:170px 0 70px; border-bottom:1px solid var(--border); }
.page-hero h1{ font-size:clamp(32px,5vw,56px); margin-top:18px; }
.page-hero p.lead{ margin-top:18px; color:var(--text-dim); max-width:640px; font-size:16px; line-height:1.6; }
.crumb{ font-size:12px; color:var(--text-faint); margin-bottom:10px; }
.crumb a{ color:var(--text-faint); }
.crumb a:hover{ color:var(--text-main); }