/* ============================================================
   A6T ASSAINISSEMENT — Design system
   Palette : fond navy profond, accent "bleu réseau" (fluides),
   accent or (savoir-faire premium). Signature : schémas techniques
   façon plan d'ingénieur, tracés au fil bleu lumineux.
   ============================================================ */

:root{
  --navy-950:#f6f7f9;
  --navy-900:#e9f0f8;
  --navy-850:#ffffff;
  --navy-800:#dbe6f3;
  --navy-700:#c9d3e0;
  --navy-600:#aab6c8;

  --blue-glow:#2b6ca3;
  --blue-dim:#3d6f9e;
  --gold:#0f8b8d;
  --gold-bright:#0c7274;
  --alert:#b5750c;

  --paper:#16233c;
  --paper-dim:#3f4a5c;
  --muted:#6b7686;
  --ink:#16233c;

  --radius-s:2px;
  --radius-m:4px;

  --font-display:'Space Grotesk', sans-serif;
  --font-body:'Inter', sans-serif;
  --font-mono:'IBM Plex Mono', monospace;

  --container: 1180px;
}

*,*::before,*::after{box-sizing:border-box;}
html{
  scroll-behavior:smooth;
  color-scheme:light only;
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important;}
}

html{
  background:#f6f7f9;
}
body{
  margin:0;
  background:#f6f7f9;
  background:var(--navy-950);
  color:#16233c;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{margin:0;padding:0;}

.wrap{max-width:var(--container); margin:0 auto; padding:0 24px;}

/* ---------- Blueprint grid backdrop ---------- */
.blueprint-bg{
  position:relative;
  background-image:
    linear-gradient(rgba(79,163,255,0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79,163,255,0.055) 1px, transparent 1px);
  background-size:40px 40px;
  background-position:center top;
}

/* ---------- Typography ---------- */
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:600;
  line-height:1.12;
  letter-spacing:-0.01em;
  margin:0 0 0.5em;
  color:var(--paper);
}
h1{font-size:clamp(2.3rem, 4.4vw, 3.6rem);}
h2{font-size:clamp(1.6rem, 2.6vw, 2.3rem);}
h3{font-size:1.3rem;}
p{margin:0 0 1em; color:var(--paper-dim);}
.lede{font-size:1.15rem; color:var(--paper-dim); max-width:60ch;}

.eyebrow{
  font-family:var(--font-mono);
  font-size:0.72rem;
  letter-spacing:0.14em;
  text-transform:uppercase;
  color:var(--blue-glow);
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-bottom:16px;
  background:rgba(37,99,168,0.08);
  border:1px solid rgba(37,99,168,0.24);
  padding:6px 14px 6px 10px;
  border-radius:999px;
}
.eyebrow::before{
  content:"";
  width:7px; height:7px;
  border-radius:50%;
  background:var(--gold);
  flex:none;
}

.mono{font-family:var(--font-mono);}
.text-muted{color:var(--muted);}

/* ---------- Header ---------- */
.site-header{
  position:sticky; top:0; z-index:50;
  border-bottom:1px solid var(--navy-700);
}
/* backdrop-filter lives on a pseudo-element rather than .site-header itself,
   because filter/backdrop-filter on an element creates a new containing block
   for its position:fixed descendants (breaks the full-screen mobile nav panel). */
.site-header::before{
  content:"";
  position:absolute; inset:0; z-index:-1;
  background:rgba(255,255,255,0.86);
  backdrop-filter:blur(10px);
}
.site-header .wrap{
  display:flex; align-items:center; justify-content:space-between;
  min-height:78px;
  gap:20px;
}
.logo{
  display:flex; align-items:center; gap:11px;
}
.logo svg{flex:none;}
.logo-word{
  font-family:var(--font-display);
  font-weight:700;
  font-size:1.2rem;
  color:var(--paper);
  letter-spacing:-0.01em;
  line-height:1.15;
}
.logo-word small{
  display:block;
  font-family:var(--font-mono);
  font-size:0.58rem;
  color:var(--muted);
  letter-spacing:0.12em;
  text-transform:uppercase;
  font-weight:400;
}
nav.main-nav{display:flex; align-items:center; gap:26px; flex:none;}
nav.main-nav a{
  font-size:0.92rem;
  color:var(--paper-dim);
  position:relative;
  padding:6px 0;
  white-space:nowrap;
}
nav.main-nav a:hover{color:var(--paper);}
nav.main-nav a.current{color:var(--blue-glow);}

/* Services dropdown */
.nav-dropdown{position:relative;}
.dropdown-trigger{display:inline-flex; align-items:center; gap:5px; cursor:pointer; background:none; border:none;}
.dropdown-trigger .caret{font-size:0.7em; color:var(--muted); transition:transform .15s ease;}
.nav-dropdown:hover .dropdown-trigger .caret, .nav-dropdown:focus-within .dropdown-trigger .caret{transform:rotate(180deg); color:var(--blue-glow);}
.dropdown-menu{
  position:absolute; top:100%; left:50%; transform:translateX(-50%);
  margin-top:14px;
  background:var(--navy-850); border:1px solid var(--navy-700); border-radius:var(--radius-m);
  padding:8px; min-width:230px; display:none; flex-direction:column; gap:2px;
  box-shadow:0 24px 48px rgba(0,0,0,0.45);
}
.nav-dropdown:hover .dropdown-menu, .nav-dropdown:focus-within .dropdown-menu{display:flex;}
.dropdown-menu a{padding:10px 14px; border-radius:var(--radius-s); font-size:0.88rem; white-space:nowrap;}
.dropdown-menu a:hover{background:var(--navy-800); color:var(--paper);}
.dropdown-menu a.current{color:var(--blue-glow);}

.header-actions{display:flex; align-items:center; gap:16px; flex:none;}

/* Mobile nav toggle */
.nav-toggle{
  display:none; flex-direction:column; justify-content:center; gap:5px;
  width:34px; height:34px; background:none; border:none; cursor:pointer; padding:0; flex:none;
}
.nav-toggle span{display:block; width:22px; height:2px; background:var(--paper); transition:transform .2s ease, opacity .2s ease;}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
.phone-link{
  font-family:var(--font-mono);
  font-size:0.95rem;
  color:var(--paper);
}
.phone-link .num-label{display:block; font-size:0.6rem; color:var(--muted); letter-spacing:0.08em; text-transform:uppercase;}

.nav-toggle{display:none;}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:10px;
  font-family:var(--font-mono);
  font-size:0.82rem;
  letter-spacing:0.04em;
  text-transform:uppercase;
  padding:13px 24px;
  border-radius:var(--radius-s);
  border:1px solid transparent;
  cursor:pointer;
  transition:all .18s ease;
}
.btn-gold{
  background:var(--gold);
  color:var(--ink);
  font-weight:600;
}
.btn-gold:hover{background:var(--gold-bright); transform:translateY(-1px);}
.btn-outline{
  border-color:var(--navy-600);
  color:var(--paper);
}
.btn-outline:hover{border-color:var(--blue-glow); color:var(--blue-glow);}
.btn-block{width:100%; justify-content:center;}

/* ---------- Hero ---------- */
.hero{
  padding:96px 0 84px;
  border-bottom:1px solid var(--navy-700);
  position:relative;
  overflow:hidden;
}
.hero::after{
  content:"";
  position:absolute; right:-10%; top:-20%;
  width:520px; height:520px;
  background:radial-gradient(circle, rgba(79,163,255,0.14), transparent 68%);
  pointer-events:none;
}
.hero-grid{display:grid; grid-template-columns:1.1fr 0.9fr; gap:60px; align-items:center;}
.hero h1{margin-bottom:20px;}
.hero .cta-row{display:flex; gap:14px; margin-top:32px; flex-wrap:wrap;}
.hero-stats{display:flex; gap:32px; margin-top:48px; flex-wrap:wrap;}
.hero-stat b{
  display:block; font-family:var(--font-display); font-size:1.7rem; color:var(--gold-bright);
}
.hero-stat span{font-size:0.78rem; color:var(--muted); text-transform:uppercase; letter-spacing:0.05em;}

/* ---------- Section shell ---------- */
section{padding:76px 0;}
.section-alt{background:var(--navy-900); border-top:1px solid var(--navy-700); border-bottom:1px solid var(--navy-700);}
.section-head{
  max-width:680px; margin-bottom:44px;
  border-radius:var(--radius-m);
  background:linear-gradient(120deg, var(--gold) 0%, var(--gold-bright) 100%);
  padding:30px 32px;
  box-shadow:0 12px 30px rgba(15,139,141,0.26);
}
.section-head .eyebrow{
  margin-bottom:12px;
  background:rgba(255,255,255,0.16);
  border-color:rgba(255,255,255,0.32);
  color:#ffffff;
}
.section-head .eyebrow::before{background:#ffffff;}
.section-head h2{color:#ffffff; margin-bottom:10px;}
.section-head p.lede{margin-bottom:0; color:rgba(255,255,255,0.86);}

.section-head.accent-blue{
  background:linear-gradient(120deg, var(--blue-glow) 0%, var(--blue-dim) 100%);
  box-shadow:0 12px 30px rgba(37,108,163,0.26);
}

/* ---------- Service cards ---------- */
.grid-3{display:grid; grid-template-columns:repeat(3,1fr); gap:22px;}
.grid-2{display:grid; grid-template-columns:1fr 1fr; gap:22px;}

.card{
  background:var(--navy-850);
  border:1px solid var(--navy-700);
  border-left:4px solid var(--gold);
  border-radius:var(--radius-m);
  padding:28px;
  box-shadow:0 2px 12px rgba(22,35,60,0.06);
  transition:border-color .18s ease, transform .18s ease, box-shadow .18s ease;
}
.card:nth-child(even){border-left-color:var(--blue-glow);}
.card:hover{transform:translateY(-3px); box-shadow:0 10px 24px rgba(22,35,60,0.12);}
.card .card-num{
  font-family:var(--font-mono); font-size:0.75rem; color:var(--gold);
  margin-bottom:14px; display:block;
}
.card h3{margin-bottom:10px; font-size:1.1rem;}
.card p{font-size:0.94rem; margin-bottom:14px;}
.card a.card-link{font-family:var(--font-mono); font-size:0.78rem; color:var(--blue-glow); text-transform:uppercase; letter-spacing:0.04em;}
.card a.card-link:hover{color:var(--gold-bright);}

/* ---------- Schematic / signature blueprint diagram ---------- */
.schematic{
  background:
    radial-gradient(120% 140% at 25% 0%, rgba(79,163,255,0.10), transparent 62%),
    var(--navy-900);
  border:1px solid var(--navy-700);
  border-radius:var(--radius-m);
  padding:32px;
  position:relative;
}
.schematic svg{width:100%; height:auto; display:block;}
.schematic .schem-caption{
  font-family:var(--font-mono); font-size:0.72rem; color:var(--muted);
  text-align:center; margin-top:18px; letter-spacing:0.04em;
}
.schem-label{fill:var(--paper); font-family:var(--font-mono); font-size:11px;}
.schem-line{stroke:var(--blue-glow); stroke-width:1;}
.schem-fill-a{fill:rgba(79,163,255,0.08);}
.schem-fill-b{fill:rgba(201,162,75,0.10);}
.schem-num{
  fill:var(--ink); font-family:var(--font-mono); font-weight:700; font-size:11px;
}
.schem-num-bg{fill:var(--gold);}

/* legend list for schematic */
.schem-legend{list-style:none; margin-top:24px; display:grid; grid-template-columns:1fr 1fr; gap:10px 24px;}
.schem-legend li{font-size:0.88rem; color:var(--paper-dim); display:flex; gap:10px;}
.schem-legend b{
  font-family:var(--font-mono); font-size:0.72rem; color:var(--ink);
  background:var(--gold); width:20px; height:20px; border-radius:50%;
  display:flex; align-items:center; justify-content:center; flex:none;
}

/* ---------- Process / steps ---------- */
.steps{display:grid; grid-template-columns:repeat(4,1fr); gap:0; border:1px solid var(--navy-700); border-radius:var(--radius-m); overflow:hidden;}
.step{padding:26px 22px; border-right:1px solid var(--navy-700); border-top:3px solid var(--gold); background:var(--navy-850);}
.step:nth-child(even){border-top-color:var(--blue-glow);}
.step:last-child{border-right:none;}
.step .step-num{font-family:var(--font-mono); color:var(--blue-glow); font-size:0.78rem; display:block; margin-bottom:10px;}
.step h4{font-size:1rem; margin-bottom:8px;}
.step p{font-size:0.88rem; margin-bottom:0;}

/* ---------- Alert / warning box ---------- */
.alert-box{
  border:1px solid rgba(232,163,61,0.4);
  background:rgba(232,163,61,0.06);
  border-radius:var(--radius-m);
  padding:22px 26px;
  display:flex; gap:16px; align-items:flex-start;
}
.alert-box .alert-icon{color:var(--alert); font-family:var(--font-mono); font-size:1.1rem; flex:none;}
.alert-box h4{color:var(--gold-bright); margin-bottom:6px; font-size:1rem;}
.alert-box ul{margin-top:8px; padding-left:18px;}
.alert-box li{color:var(--paper-dim); font-size:0.92rem; margin-bottom:4px;}

/* ---------- Table (frequency / pricing style data) ---------- */
table.data-table{width:100%; border-collapse:collapse; font-size:0.92rem;}
table.data-table th,table.data-table td{
  text-align:left; padding:14px 16px; border-bottom:1px solid var(--navy-700);
}
table.data-table th{
  font-family:var(--font-mono); font-size:0.72rem; text-transform:uppercase; letter-spacing:0.05em; color:var(--muted);
}
table.data-table td{color:var(--paper-dim);}
table.data-table tr:last-child td{border-bottom:none;}

/* ---------- FAQ ---------- */
.faq-item{border-bottom:1px solid var(--navy-700);}
.faq-item summary{
  cursor:pointer; padding:22px 0; font-family:var(--font-display); font-size:1.05rem; color:var(--paper);
  list-style:none; display:flex; justify-content:space-between; align-items:center; gap:20px;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"+"; font-family:var(--font-mono); color:var(--gold); font-size:1.3rem; flex:none;
}
.faq-item[open] summary::after{content:"–";}
.faq-item p{padding-bottom:22px; margin:0;}

/* ---------- CTA band ---------- */
.cta-band{
  background:linear-gradient(120deg, var(--navy-850), var(--navy-800));
  border:1px solid var(--navy-700);
  border-radius:var(--radius-m);
  padding:48px;
  display:flex; align-items:center; justify-content:space-between; gap:30px; flex-wrap:wrap;
}
.cta-band h3{margin-bottom:6px;}
.cta-band p{margin:0; color:var(--paper-dim);}

/* ---------- Zone map list ---------- */
.zone-list{display:grid; grid-template-columns:repeat(3,1fr); gap:8px 30px;}
.zone-list li{font-size:0.92rem; color:var(--paper-dim); padding:6px 0; border-bottom:1px dotted var(--navy-700);}

/* ---------- Footer ---------- */
footer{border-top:1px solid var(--navy-700); padding:32px 0 18px; background:var(--navy-950);}
.footer-logo{
  display:flex; align-items:center; gap:9px;
  margin-bottom:8px;
}
.footer-logo svg{flex:none;}
.footer-logo span{font-family:var(--font-display); font-weight:600; font-size:0.92rem; color:var(--paper);}
.footer-logo span .dot{color:var(--gold); margin:0 2px;}
.footer-logo small{font-family:var(--font-mono); font-size:0.62rem; color:var(--muted); letter-spacing:0.08em; text-transform:uppercase; font-weight:400;}
.footer-simple{display:flex; justify-content:space-between; align-items:flex-start; gap:30px; flex-wrap:wrap; margin-bottom:20px;}
.footer-contact-line{list-style:none; display:flex; flex-direction:column; gap:6px; align-items:flex-end; text-align:right;}
.footer-contact-line a, .footer-contact-line span{font-size:0.78rem; color:var(--paper-dim);}
.footer-contact-line a:hover{color:var(--blue-glow);}
.footer-bottom{
  border-top:1px solid var(--navy-700); padding-top:16px;
  display:flex; justify-content:space-between; font-size:0.7rem; color:var(--muted); flex-wrap:wrap; gap:8px;
}

/* ---------- Breadcrumb ---------- */
.crumb{font-family:var(--font-mono); font-size:0.76rem; color:var(--muted); padding:22px 0 0;}
.crumb a{color:var(--muted);}
.crumb a:hover{color:var(--blue-glow);}
.crumb .sep{margin:0 8px; color:var(--navy-600);}

/* ---------- Utility ---------- */
.mt-0{margin-top:0;}
.center{text-align:center; margin-left:auto; margin-right:auto;}

/* ---------- Responsive ---------- */
@media (max-width: 980px){
  .hero-grid, .grid-2{grid-template-columns:1fr;}
  .footer-simple{flex-direction:column; gap:18px;}
  .footer-contact-line{align-items:flex-start; text-align:left;}
  .grid-3{grid-template-columns:1fr 1fr;}
  .steps{grid-template-columns:1fr 1fr;}
  .step{border-right:none; border-bottom:1px solid var(--navy-700);}
  .zone-list{grid-template-columns:1fr 1fr;}

  .nav-toggle{display:flex;}
  nav.main-nav{
    display:flex; flex-direction:column; align-items:stretch; gap:0;
    position:fixed; top:66px; left:0; right:0; bottom:0;
    background:var(--navy-950); border-top:1px solid var(--navy-700);
    padding:10px 24px 30px;
    transform:translateX(100%);
    transition:transform .22s ease;
    overflow-y:auto;
  }
  .site-header.nav-open nav.main-nav{transform:translateX(0);}
  nav.main-nav a{padding:16px 0; border-bottom:1px solid var(--navy-700); font-size:1.05rem;}
  .nav-dropdown{display:flex; flex-direction:column;}
  .dropdown-trigger{padding:16px 0; border-bottom:1px solid var(--navy-700); justify-content:space-between; width:100%; font-size:1.05rem;}
  .dropdown-menu{
    position:static; display:none; transform:none; margin:0; box-shadow:none;
    border:none; border-radius:0; background:var(--navy-900); padding:0 0 0 14px;
  }
  .nav-dropdown.dropdown-open .dropdown-menu{display:flex;}
  .nav-dropdown.dropdown-open .dropdown-trigger .caret{transform:rotate(180deg);}
  .dropdown-menu a{padding:14px 0; border-bottom:1px solid var(--navy-700); border-radius:0;}
  .header-actions .btn-gold{padding:11px 16px; font-size:0.72rem;}
}

@media (max-width: 560px){
  .header-actions .phone-link{display:none;}
}

@media (max-width: 400px){
  .header-actions .btn-gold{padding:10px 13px; font-size:0.66rem;}
  .logo small{display:none;}
}
@media (max-width: 640px){
  .grid-3{grid-template-columns:1fr;}
  .steps{grid-template-columns:1fr;}
  .schem-legend{grid-template-columns:1fr;}
  .zone-list{grid-template-columns:1fr;}
  .cta-band{flex-direction:column; align-items:flex-start;}
  .site-header .wrap{height:66px;}
  .header-actions .btn-outline{display:none;}
}